xserver pixman mesa git update 19 jan 2011

1 files changed, 1908 insertions, 1898 deletions

diff --git a/mesalib/src/mesa/main/context.c b/mesalib/src/mesa/main/context.c
index 90df5fc9e..fe370fa36 100644
--- a/mesalib/src/mesa/main/context.c
+++ b/mesalib/src/mesa/main/context.c
@@ -1,1898 +1,1908 @@
-/*

- * Mesa 3-D graphics library

- * Version:  7.3

- *

- * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.

- * Copyright (C) 2008  VMware, Inc.  All Rights Reserved.

- *

- * Permission is hereby granted, free of charge, to any person obtaining a

- * copy of this software and associated documentation files (the "Software"),

- * to deal in the Software without restriction, including without limitation

- * the rights to use, copy, modify, merge, publish, distribute, sublicense,

- * and/or sell copies of the Software, and to permit persons to whom the

- * Software is furnished to do so, subject to the following conditions:

- *

- * The above copyright notice and this permission notice shall be included

- * in all copies or substantial portions of the Software.

- *

- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

- */

-

-/**

- * \file context.c

- * Mesa context/visual/framebuffer management functions.

- * \author Brian Paul

- */

-

-/**

- * \mainpage Mesa Main Module

- *

- * \section MainIntroduction Introduction

- *

- * The Mesa Main module consists of all the files in the main/ directory.

- * Among the features of this module are:

- * <UL>

- * <LI> Structures to represent most GL state </LI>

- * <LI> State set/get functions </LI>

- * <LI> Display lists </LI>

- * <LI> Texture unit, object and image handling </LI>

- * <LI> Matrix and attribute stacks </LI>

- * </UL>

- *

- * Other modules are responsible for API dispatch, vertex transformation,

- * point/line/triangle setup, rasterization, vertex array caching,

- * vertex/fragment programs/shaders, etc.

- *

- *

- * \section AboutDoxygen About Doxygen

- *

- * If you're viewing this information as Doxygen-generated HTML you'll

- * see the documentation index at the top of this page.

- *

- * The first line lists the Mesa source code modules.

- * The second line lists the indexes available for viewing the documentation

- * for each module.

- *

- * Selecting the <b>Main page</b> link will display a summary of the module

- * (this page).

- *

- * Selecting <b>Data Structures</b> will list all C structures.

- *

- * Selecting the <b>File List</b> link will list all the source files in

- * the module.

- * Selecting a filename will show a list of all functions defined in that file.

- *

- * Selecting the <b>Data Fields</b> link will display a list of all

- * documented structure members.

- *

- * Selecting the <b>Globals</b> link will display a list

- * of all functions, structures, global variables and macros in the module.

- *

- */

-

-

-#include "glheader.h"

-#include "mfeatures.h"

-#include "imports.h"

-#include "accum.h"

-#include "api_exec.h"

-#include "arrayobj.h"

-#include "attrib.h"

-#include "blend.h"

-#include "buffers.h"

-#include "bufferobj.h"

-#include "context.h"

-#include "cpuinfo.h"

-#include "debug.h"

-#include "depth.h"

-#include "dlist.h"

-#include "eval.h"

-#include "extensions.h"

-#include "fbobject.h"

-#include "feedback.h"

-#include "fog.h"

-#include "formats.h"

-#include "framebuffer.h"

-#include "hint.h"

-#include "hash.h"

-#include "light.h"

-#include "lines.h"

-#include "macros.h"

-#include "matrix.h"

-#include "multisample.h"

-#include "pixel.h"

-#include "pixelstore.h"

-#include "points.h"

-#include "polygon.h"

-#include "queryobj.h"

-#include "syncobj.h"

-#include "rastpos.h"

-#include "remap.h"

-#include "scissor.h"

-#include "shared.h"

-#include "shaderobj.h"

-#include "simple_list.h"

-#include "state.h"

-#include "stencil.h"

-#include "texcompress_s3tc.h"

-#include "texstate.h"

-#include "transformfeedback.h"

-#include "mtypes.h"

-#include "varray.h"

-#include "version.h"

-#include "viewport.h"

-#include "vtxfmt.h"

-#include "program/program.h"

-#include "program/prog_print.h"

-#if _HAVE_FULL_GL

-#include "math/m_matrix.h"

-#endif

-#include "main/dispatch.h" /* for _gloffset_COUNT */

-

-#ifdef USE_SPARC_ASM

-#include "sparc/sparc.h"

-#endif

-

-#include "glsl_parser_extras.h"

-#include <stdbool.h>

-

-

-#ifndef MESA_VERBOSE

-int MESA_VERBOSE = 0;

-#endif

-

-#ifndef MESA_DEBUG_FLAGS

-int MESA_DEBUG_FLAGS = 0;

-#endif

-

-

-/* ubyte -> float conversion */

-GLfloat _mesa_ubyte_to_float_color_tab[256];

-

-

-

-/**

- * Swap buffers notification callback.

- * 

- * \param ctx GL context.

- *

- * Called by window system just before swapping buffers.

- * We have to finish any pending rendering.

- */

-void

-_mesa_notifySwapBuffers(struct gl_context *ctx)

-{

-   if (MESA_VERBOSE & VERBOSE_SWAPBUFFERS)

-      _mesa_debug(ctx, "SwapBuffers\n");

-   FLUSH_CURRENT( ctx, 0 );

-   if (ctx->Driver.Flush) {

-      ctx->Driver.Flush(ctx);

-   }

-}

-

-

-/**********************************************************************/

-/** \name GL Visual allocation/destruction                            */

-/**********************************************************************/

-/*@{*/

-

-/**

- * Allocates a struct gl_config structure and initializes it via

- * _mesa_initialize_visual().

- * 

- * \param dbFlag double buffering

- * \param stereoFlag stereo buffer

- * \param depthBits requested bits per depth buffer value. Any value in [0, 32]

- * is acceptable but the actual depth type will be GLushort or GLuint as

- * needed.

- * \param stencilBits requested minimum bits per stencil buffer value

- * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.

- * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE

- * \param redBits number of bits per color component in frame buffer for RGB(A)

- * mode.  We always use 8 in core Mesa though.

- * \param greenBits same as above.

- * \param blueBits same as above.

- * \param alphaBits same as above.

- * \param numSamples not really used.

- * 

- * \return pointer to new struct gl_config or NULL if requested parameters can't be

- * met.

- *

- * \note Need to add params for level and numAuxBuffers (at least)

- */

-struct gl_config *

-_mesa_create_visual( GLboolean dbFlag,

-                     GLboolean stereoFlag,

-                     GLint redBits,

-                     GLint greenBits,

-                     GLint blueBits,

-                     GLint alphaBits,

-                     GLint depthBits,

-                     GLint stencilBits,

-                     GLint accumRedBits,

-                     GLint accumGreenBits,

-                     GLint accumBlueBits,

-                     GLint accumAlphaBits,

-                     GLint numSamples )

-{

-   struct gl_config *vis = CALLOC_STRUCT(gl_config);

-   if (vis) {

-      if (!_mesa_initialize_visual(vis, dbFlag, stereoFlag,

-                                   redBits, greenBits, blueBits, alphaBits,

-                                   depthBits, stencilBits,

-                                   accumRedBits, accumGreenBits,

-                                   accumBlueBits, accumAlphaBits,

-                                   numSamples)) {

-         free(vis);

-         return NULL;

-      }

-   }

-   return vis;

-}

-

-

-/**

- * Makes some sanity checks and fills in the fields of the struct

- * gl_config object with the given parameters.  If the caller needs to

- * set additional fields, he should just probably init the whole

- * gl_config object himself.

- *

- * \return GL_TRUE on success, or GL_FALSE on failure.

- *

- * \sa _mesa_create_visual() above for the parameter description.

- */

-GLboolean

-_mesa_initialize_visual( struct gl_config *vis,

-                         GLboolean dbFlag,

-                         GLboolean stereoFlag,

-                         GLint redBits,

-                         GLint greenBits,

-                         GLint blueBits,

-                         GLint alphaBits,

-                         GLint depthBits,

-                         GLint stencilBits,

-                         GLint accumRedBits,

-                         GLint accumGreenBits,

-                         GLint accumBlueBits,

-                         GLint accumAlphaBits,

-                         GLint numSamples )

-{

-   assert(vis);

-

-   if (depthBits < 0 || depthBits > 32) {

-      return GL_FALSE;

-   }

-   if (stencilBits < 0 || stencilBits > STENCIL_BITS) {

-      return GL_FALSE;

-   }

-   assert(accumRedBits >= 0);

-   assert(accumGreenBits >= 0);

-   assert(accumBlueBits >= 0);

-   assert(accumAlphaBits >= 0);

-

-   vis->rgbMode          = GL_TRUE;

-   vis->doubleBufferMode = dbFlag;

-   vis->stereoMode       = stereoFlag;

-

-   vis->redBits          = redBits;

-   vis->greenBits        = greenBits;

-   vis->blueBits         = blueBits;

-   vis->alphaBits        = alphaBits;

-   vis->rgbBits          = redBits + greenBits + blueBits;

-

-   vis->indexBits      = 0;

-   vis->depthBits      = depthBits;

-   vis->stencilBits    = stencilBits;

-

-   vis->accumRedBits   = accumRedBits;

-   vis->accumGreenBits = accumGreenBits;

-   vis->accumBlueBits  = accumBlueBits;

-   vis->accumAlphaBits = accumAlphaBits;

-

-   vis->haveAccumBuffer   = accumRedBits > 0;

-   vis->haveDepthBuffer   = depthBits > 0;

-   vis->haveStencilBuffer = stencilBits > 0;

-

-   vis->numAuxBuffers = 0;

-   vis->level = 0;

-   vis->sampleBuffers = numSamples > 0 ? 1 : 0;

-   vis->samples = numSamples;

-

-   return GL_TRUE;

-}

-

-

-/**

- * Destroy a visual and free its memory.

- *

- * \param vis visual.

- * 

- * Frees the visual structure.

- */

-void

-_mesa_destroy_visual( struct gl_config *vis )

-{

-   free(vis);

-}

-

-/*@}*/

-

-

-/**********************************************************************/

-/** \name Context allocation, initialization, destroying

- *

- * The purpose of the most initialization functions here is to provide the

- * default state values according to the OpenGL specification.

- */

-/**********************************************************************/

-/*@{*/

-

-

-/**

- * This is lame.  gdb only seems to recognize enum types that are

- * actually used somewhere.  We want to be able to print/use enum

- * values such as TEXTURE_2D_INDEX in gdb.  But we don't actually use

- * the gl_texture_index type anywhere.  Thus, this lame function.

- */

-static void

-dummy_enum_func(void)

-{

-   gl_buffer_index bi = BUFFER_FRONT_LEFT;

-   gl_face_index fi = FACE_POS_X;

-   gl_frag_attrib fa = FRAG_ATTRIB_WPOS;

-   gl_frag_result fr = FRAG_RESULT_DEPTH;

-   gl_texture_index ti = TEXTURE_2D_ARRAY_INDEX;

-   gl_vert_attrib va = VERT_ATTRIB_POS;

-   gl_vert_result vr = VERT_RESULT_HPOS;

-   gl_geom_attrib ga = GEOM_ATTRIB_POSITION;

-   gl_geom_result gr = GEOM_RESULT_POS;

-

-   (void) bi;

-   (void) fi;

-   (void) fa;

-   (void) fr;

-   (void) ti;

-   (void) va;

-   (void) vr;

-   (void) ga;

-   (void) gr;

-}

-

-

-/**

- * One-time initialization mutex lock.

- *

- * \sa Used by one_time_init().

- */

-_glthread_DECLARE_STATIC_MUTEX(OneTimeLock);

-

-

-

-/**

- * Calls all the various one-time-init functions in Mesa.

- *

- * While holding a global mutex lock, calls several initialization functions,

- * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is

- * defined.

- *

- * \sa _math_init().

- */

-static void

-one_time_init( struct gl_context *ctx )

-{

-   static GLbitfield api_init_mask = 0x0;

-

-   _glthread_LOCK_MUTEX(OneTimeLock);

-

-   /* truly one-time init */

-   if (!api_init_mask) {

-      GLuint i;

-

-      /* do some implementation tests */

-      assert( sizeof(GLbyte) == 1 );

-      assert( sizeof(GLubyte) == 1 );

-      assert( sizeof(GLshort) == 2 );

-      assert( sizeof(GLushort) == 2 );

-      assert( sizeof(GLint) == 4 );

-      assert( sizeof(GLuint) == 4 );

-

-      _mesa_get_cpu_features();

-

-      _mesa_init_sqrt_table();

-

-      /* context dependence is never a one-time thing... */

-      _mesa_init_get_hash(ctx);

-

-      for (i = 0; i < 256; i++) {

-         _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;

-      }

-

-#if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)

-      if (MESA_VERBOSE != 0) {

-	 _mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",

-		     MESA_VERSION_STRING, __DATE__, __TIME__);

-      }

-#endif

-

-#ifdef DEBUG

-      _mesa_test_formats();

-#endif

-   }

-

-   /* per-API one-time init */

-   if (!(api_init_mask & (1 << ctx->API))) {

-      /*

-       * This is fine as ES does not use the remap table, but it may not be

-       * future-proof.  We cannot always initialize the remap table because

-       * when an app is linked to libGLES*, there are not enough dynamic

-       * entries.

-       */

-      if (ctx->API == API_OPENGL)

-         _mesa_init_remap_table();

-   }

-

-   api_init_mask |= 1 << ctx->API;

-

-   _glthread_UNLOCK_MUTEX(OneTimeLock);

-

-   /* Hopefully atexit() is widely available.  If not, we may need some

-    * #ifdef tests here.

-    */

-   atexit(_mesa_destroy_shader_compiler);

-

-   dummy_enum_func();

-}

-

-

-/**

- * Initialize fields of gl_current_attrib (aka ctx->Current.*)

- */

-static void

-_mesa_init_current(struct gl_context *ctx)

-{

-   GLuint i;

-

-   /* Init all to (0,0,0,1) */

-   for (i = 0; i < Elements(ctx->Current.Attrib); i++) {

-      ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );

-   }

-

-   /* redo special cases: */

-   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 0.0 );

-   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );

-   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );

-   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );

-   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );

-   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );

-}

-

-

-/**

- * Init vertex/fragment/geometry program limits.

- * Important: drivers should override these with actual limits.

- */

-static void

-init_program_limits(GLenum type, struct gl_program_constants *prog)

-{

-   prog->MaxInstructions = MAX_PROGRAM_INSTRUCTIONS;

-   prog->MaxAluInstructions = MAX_PROGRAM_INSTRUCTIONS;

-   prog->MaxTexInstructions = MAX_PROGRAM_INSTRUCTIONS;

-   prog->MaxTexIndirections = MAX_PROGRAM_INSTRUCTIONS;

-   prog->MaxTemps = MAX_PROGRAM_TEMPS;

-   prog->MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;

-   prog->MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;

-   prog->MaxUniformComponents = 4 * MAX_UNIFORMS;

-

-   switch (type) {

-   case GL_VERTEX_PROGRAM_ARB:

-      prog->MaxParameters = MAX_VERTEX_PROGRAM_PARAMS;

-      prog->MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;

-      prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;

-      break;

-   case GL_FRAGMENT_PROGRAM_ARB:

-      prog->MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;

-      prog->MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;

-      prog->MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;

-      break;

-   case MESA_GEOMETRY_PROGRAM:

-      prog->MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;

-      prog->MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;

-      prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;

-

-      prog->MaxGeometryTextureImageUnits = MAX_GEOMETRY_TEXTURE_IMAGE_UNITS;

-      prog->MaxGeometryVaryingComponents = MAX_GEOMETRY_VARYING_COMPONENTS;

-      prog->MaxVertexVaryingComponents = MAX_VERTEX_VARYING_COMPONENTS;

-      prog->MaxGeometryUniformComponents = MAX_GEOMETRY_UNIFORM_COMPONENTS;

-      prog->MaxGeometryOutputVertices = MAX_GEOMETRY_OUTPUT_VERTICES;

-      prog->MaxGeometryTotalOutputComponents = MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS;

-      break;

-   default:

-      assert(0 && "Bad program type in init_program_limits()");

-   }

-

-   /* Set the native limits to zero.  This implies that there is no native

-    * support for shaders.  Let the drivers fill in the actual values.

-    */

-   prog->MaxNativeInstructions = 0;

-   prog->MaxNativeAluInstructions = 0;

-   prog->MaxNativeTexInstructions = 0;

-   prog->MaxNativeTexIndirections = 0;

-   prog->MaxNativeAttribs = 0;

-   prog->MaxNativeTemps = 0;

-   prog->MaxNativeAddressRegs = 0;

-   prog->MaxNativeParameters = 0;

-}

-

-

-/**

- * Initialize fields of gl_constants (aka ctx->Const.*).

- * Use defaults from config.h.  The device drivers will often override

- * some of these values (such as number of texture units).

- */

-static void 

-_mesa_init_constants(struct gl_context *ctx)

-{

-   assert(ctx);

-

-   /* Constants, may be overriden (usually only reduced) by device drivers */

-   ctx->Const.MaxTextureMbytes = MAX_TEXTURE_MBYTES;

-   ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;

-   ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;

-   ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;

-   ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;

-   ctx->Const.MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;

-   ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;

-   ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;

-   ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,

-                                     ctx->Const.MaxTextureImageUnits);

-   ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;

-   ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;

-   ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;

-   ctx->Const.SubPixelBits = SUB_PIXEL_BITS;

-   ctx->Const.MinPointSize = MIN_POINT_SIZE;

-   ctx->Const.MaxPointSize = MAX_POINT_SIZE;

-   ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;

-   ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;

-   ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;

-   ctx->Const.MinLineWidth = MIN_LINE_WIDTH;

-   ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;

-   ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;

-   ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;

-   ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;

-   ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;

-   ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;

-   ctx->Const.MaxLights = MAX_LIGHTS;

-   ctx->Const.MaxShininess = 128.0;

-   ctx->Const.MaxSpotExponent = 128.0;

-   ctx->Const.MaxViewportWidth = MAX_WIDTH;

-   ctx->Const.MaxViewportHeight = MAX_HEIGHT;

-#if FEATURE_ARB_vertex_program

-   init_program_limits(GL_VERTEX_PROGRAM_ARB, &ctx->Const.VertexProgram);

-#endif

-#if FEATURE_ARB_fragment_program

-   init_program_limits(GL_FRAGMENT_PROGRAM_ARB, &ctx->Const.FragmentProgram);

-#endif

-#if FEATURE_ARB_geometry_shader4

-   init_program_limits(MESA_GEOMETRY_PROGRAM, &ctx->Const.GeometryProgram);

-#endif

-   ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;

-   ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;

-

-   /* CheckArrayBounds is overriden by drivers/x11 for X server */

-   ctx->Const.CheckArrayBounds = GL_FALSE;

-

-   /* GL_ARB_draw_buffers */

-   ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;

-

-#if FEATURE_EXT_framebuffer_object

-   ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;

-   ctx->Const.MaxRenderbufferSize = MAX_WIDTH;

-#endif

-

-#if FEATURE_ARB_vertex_shader

-   ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;

-   ctx->Const.MaxCombinedTextureImageUnits = MAX_COMBINED_TEXTURE_IMAGE_UNITS;

-   ctx->Const.MaxVarying = MAX_VARYING;

-#endif

-

-   /* Shading language version */

-   if (ctx->API == API_OPENGL) {

-      ctx->Const.GLSLVersion = 120;

-   }

-   else if (ctx->API == API_OPENGLES2) {

-      ctx->Const.GLSLVersion = 100;

-   }

-   else if (ctx->API == API_OPENGLES) {

-      ctx->Const.GLSLVersion = 0; /* GLSL not supported */

-   }

-

-   /* GL_ARB_framebuffer_object */

-   ctx->Const.MaxSamples = 0;

-

-   /* GL_ARB_sync */

-   ctx->Const.MaxServerWaitTimeout = (GLuint64) ~0;

-

-   /* GL_ATI_envmap_bumpmap */

-   ctx->Const.SupportedBumpUnits = SUPPORTED_ATI_BUMP_UNITS;

-

-   /* GL_EXT_provoking_vertex */

-   ctx->Const.QuadsFollowProvokingVertexConvention = GL_TRUE;

-

-   /* GL_EXT_transform_feedback */

-   ctx->Const.MaxTransformFeedbackSeparateAttribs = MAX_FEEDBACK_ATTRIBS;

-   ctx->Const.MaxTransformFeedbackSeparateComponents = 4 * MAX_FEEDBACK_ATTRIBS;

-   ctx->Const.MaxTransformFeedbackInterleavedComponents = 4 * MAX_FEEDBACK_ATTRIBS;

-

-   /* GL 3.2: hard-coded for now: */

-   ctx->Const.ProfileMask = GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;

-

-   /** GL_EXT_gpu_shader4 */

-   ctx->Const.MinProgramTexelOffset = -8;

-   ctx->Const.MaxProgramTexelOffset = 7;

-}

-

-

-/**

- * Do some sanity checks on the limits/constants for the given context.

- * Only called the first time a context is bound.

- */

-static void

-check_context_limits(struct gl_context *ctx)

-{

-   /* check that we don't exceed the size of various bitfields */

-   assert(VERT_RESULT_MAX <=

-	  (8 * sizeof(ctx->VertexProgram._Current->Base.OutputsWritten)));

-   assert(FRAG_ATTRIB_MAX <=

-	  (8 * sizeof(ctx->FragmentProgram._Current->Base.InputsRead)));

-

-   assert(MAX_COMBINED_TEXTURE_IMAGE_UNITS <= 8 * sizeof(GLbitfield));

-

-   /* shader-related checks */

-   assert(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);

-   assert(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);

-

-   assert(MAX_NV_FRAGMENT_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);

-   assert(MAX_NV_VERTEX_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);

-   assert(MAX_NV_VERTEX_PROGRAM_INPUTS <= VERT_ATTRIB_MAX);

-   assert(MAX_NV_VERTEX_PROGRAM_OUTPUTS <= VERT_RESULT_MAX);

-

-   /* Texture unit checks */

-   assert(ctx->Const.MaxTextureImageUnits > 0);

-   assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);

-   assert(ctx->Const.MaxTextureCoordUnits > 0);

-   assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);

-   assert(ctx->Const.MaxTextureUnits > 0);

-   assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);

-   assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);

-   assert(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,

-                                             ctx->Const.MaxTextureCoordUnits));

-   assert(ctx->Const.MaxCombinedTextureImageUnits > 0);

-   assert(ctx->Const.MaxCombinedTextureImageUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);

-   assert(ctx->Const.MaxTextureCoordUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);

-   /* number of coord units cannot be greater than number of image units */

-   assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.MaxTextureImageUnits);

-

-

-   /* Texture size checks */

-   assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);

-   assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);

-   assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);

-   assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);

-

-   /* make sure largest texture image is <= MAX_WIDTH in size */

-   assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= MAX_WIDTH);

-   assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= MAX_WIDTH);

-   assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= MAX_WIDTH);

-

-   /* Texture level checks */

-   assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);

-   assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);

-

-   /* Max texture size should be <= max viewport size (render to texture) */

-   assert((1 << (MAX_TEXTURE_LEVELS - 1)) <= MAX_WIDTH);

-

-   assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);

-   assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);

-

-   assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);

-

-   /* if this fails, add more enum values to gl_buffer_index */

-   assert(BUFFER_COLOR0 + MAX_DRAW_BUFFERS <= BUFFER_COUNT);

-

-   /* XXX probably add more tests */

-}

-

-

-/**

- * Initialize the attribute groups in a GL context.

- *

- * \param ctx GL context.

- *

- * Initializes all the attributes, calling the respective <tt>init*</tt>

- * functions for the more complex data structures.

- */

-static GLboolean

-init_attrib_groups(struct gl_context *ctx)

-{

-   assert(ctx);

-

-   /* Constants */

-   _mesa_init_constants( ctx );

-

-   /* Extensions */

-   _mesa_init_extensions( ctx );

-

-   /* Attribute Groups */

-   _mesa_init_accum( ctx );

-   _mesa_init_attrib( ctx );

-   _mesa_init_buffer_objects( ctx );

-   _mesa_init_color( ctx );

-   _mesa_init_current( ctx );

-   _mesa_init_depth( ctx );

-   _mesa_init_debug( ctx );

-   _mesa_init_display_list( ctx );

-   _mesa_init_eval( ctx );

-   _mesa_init_fbobjects( ctx );

-   _mesa_init_feedback( ctx );

-   _mesa_init_fog( ctx );

-   _mesa_init_hint( ctx );

-   _mesa_init_line( ctx );

-   _mesa_init_lighting( ctx );

-   _mesa_init_matrix( ctx );

-   _mesa_init_multisample( ctx );

-   _mesa_init_pixel( ctx );

-   _mesa_init_pixelstore( ctx );

-   _mesa_init_point( ctx );

-   _mesa_init_polygon( ctx );

-   _mesa_init_program( ctx );

-   _mesa_init_queryobj( ctx );

-   _mesa_init_sync( ctx );

-   _mesa_init_rastpos( ctx );

-   _mesa_init_scissor( ctx );

-   _mesa_init_shader_state( ctx );

-   _mesa_init_stencil( ctx );

-   _mesa_init_transform( ctx );

-   _mesa_init_transform_feedback( ctx );

-   _mesa_init_varray( ctx );

-   _mesa_init_viewport( ctx );

-

-   if (!_mesa_init_texture( ctx ))

-      return GL_FALSE;

-

-   _mesa_init_texture_s3tc( ctx );

-

-   /* Miscellaneous */

-   ctx->NewState = _NEW_ALL;

-   ctx->ErrorValue = (GLenum) GL_NO_ERROR;

-   ctx->varying_vp_inputs = ~0;

-

-   return GL_TRUE;

-}

-

-

-/**

- * Update default objects in a GL context with respect to shared state.

- *

- * \param ctx GL context.

- *

- * Removes references to old default objects, (texture objects, program

- * objects, etc.) and changes to reference those from the current shared

- * state.

- */

-static GLboolean

-update_default_objects(struct gl_context *ctx)

-{

-   assert(ctx);

-

-   _mesa_update_default_objects_program(ctx);

-   _mesa_update_default_objects_texture(ctx);

-   _mesa_update_default_objects_buffer_objects(ctx);

-

-   return GL_TRUE;

-}

-

-

-/**

- * This is the default function we plug into all dispatch table slots

- * This helps prevents a segfault when someone calls a GL function without

- * first checking if the extension's supported.

- */

-static int

-generic_nop(void)

-{

-   _mesa_warning(NULL, "User called no-op dispatch function (an unsupported extension function?)");

-   return 0;

-}

-

-

-/**

- * Allocate and initialize a new dispatch table.

- */

-struct _glapi_table *

-_mesa_alloc_dispatch_table(int size)

-{

-   /* Find the larger of Mesa's dispatch table and libGL's dispatch table.

-    * In practice, this'll be the same for stand-alone Mesa.  But for DRI

-    * Mesa we do this to accomodate different versions of libGL and various

-    * DRI drivers.

-    */

-   GLint numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);

-   struct _glapi_table *table;

-

-   /* should never happen, but just in case */

-   numEntries = MAX2(numEntries, size);

-

-   table = (struct _glapi_table *) malloc(numEntries * sizeof(_glapi_proc));

-   if (table) {

-      _glapi_proc *entry = (_glapi_proc *) table;

-      GLint i;

-      for (i = 0; i < numEntries; i++) {

-         entry[i] = (_glapi_proc) generic_nop;

-      }

-   }

-   return table;

-}

-

-

-/**

- * Initialize a struct gl_context struct (rendering context).

- *

- * This includes allocating all the other structs and arrays which hang off of

- * the context by pointers.

- * Note that the driver needs to pass in its dd_function_table here since

- * we need to at least call driverFunctions->NewTextureObject to create the

- * default texture objects.

- * 

- * Called by _mesa_create_context().

- *

- * Performs the imports and exports callback tables initialization, and

- * miscellaneous one-time initializations. If no shared context is supplied one

- * is allocated, and increase its reference count.  Setups the GL API dispatch

- * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.

- * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables

- * for debug flags.

- *

- * \param ctx the context to initialize

- * \param api the GL API type to create the context for

- * \param visual describes the visual attributes for this context

- * \param share_list points to context to share textures, display lists,

- *        etc with, or NULL

- * \param driverFunctions table of device driver functions for this context

- *        to use

- * \param driverContext pointer to driver-specific context data

- */

-GLboolean

-_mesa_initialize_context_for_api(struct gl_context *ctx,

-				 gl_api api,

-				 const struct gl_config *visual,

-				 struct gl_context *share_list,

-				 const struct dd_function_table *driverFunctions,

-				 void *driverContext)

-{

-   struct gl_shared_state *shared;

-   int i;

-

-   /*ASSERT(driverContext);*/

-   assert(driverFunctions->NewTextureObject);

-   assert(driverFunctions->FreeTexImageData);

-

-   ctx->API = api;

-   ctx->Visual = *visual;

-   ctx->DrawBuffer = NULL;

-   ctx->ReadBuffer = NULL;

-   ctx->WinSysDrawBuffer = NULL;

-   ctx->WinSysReadBuffer = NULL;

-

-   /* misc one-time initializations */

-   one_time_init(ctx);

-

-   /* Plug in driver functions and context pointer here.

-    * This is important because when we call alloc_shared_state() below

-    * we'll call ctx->Driver.NewTextureObject() to create the default

-    * textures.

-    */

-   ctx->Driver = *driverFunctions;

-   ctx->DriverCtx = driverContext;

-

-   if (share_list) {

-      /* share state with another context */

-      shared = share_list->Shared;

-   }

-   else {

-      /* allocate new, unshared state */

-      shared = _mesa_alloc_shared_state(ctx);

-      if (!shared)

-         return GL_FALSE;

-   }

-

-   _glthread_LOCK_MUTEX(shared->Mutex);

-   ctx->Shared = shared;

-   shared->RefCount++;

-   _glthread_UNLOCK_MUTEX(shared->Mutex);

-

-   if (!init_attrib_groups( ctx )) {

-      _mesa_release_shared_state(ctx, ctx->Shared);

-      return GL_FALSE;

-   }

-

-#if FEATURE_dispatch

-   /* setup the API dispatch tables */

-   switch (ctx->API) {

-#if FEATURE_GL

-   case API_OPENGL:

-      ctx->Exec = _mesa_create_exec_table();

-      break;

-#endif

-#if FEATURE_ES1

-   case API_OPENGLES:

-      ctx->Exec = _mesa_create_exec_table_es1();

-      break;

-#endif

-#if FEATURE_ES2

-   case API_OPENGLES2:

-      ctx->Exec = _mesa_create_exec_table_es2();

-      break;

-#endif

-   default:

-      _mesa_problem(ctx, "unknown or unsupported API");

-      break;

-   }

-

-   if (!ctx->Exec) {

-      _mesa_release_shared_state(ctx, ctx->Shared);

-      return GL_FALSE;

-   }

-#endif

-   ctx->CurrentDispatch = ctx->Exec;

-

-   ctx->FragmentProgram._MaintainTexEnvProgram

-      = (_mesa_getenv("MESA_TEX_PROG") != NULL);

-

-   ctx->VertexProgram._MaintainTnlProgram

-      = (_mesa_getenv("MESA_TNL_PROG") != NULL);

-   if (ctx->VertexProgram._MaintainTnlProgram) {

-      /* this is required... */

-      ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;

-   }

-

-   /* Mesa core handles all the formats that mesa core knows about.

-    * Drivers will want to override this list with just the formats

-    * they can handle, and confirm that appropriate fallbacks exist in

-    * _mesa_choose_tex_format().

-    */

-   memset(&ctx->TextureFormatSupported, GL_TRUE,

-	  sizeof(ctx->TextureFormatSupported));

-

-   switch (ctx->API) {

-   case API_OPENGL:

-#if FEATURE_dlist

-      ctx->Save = _mesa_create_save_table();

-      if (!ctx->Save) {

-	 _mesa_release_shared_state(ctx, ctx->Shared);

-	 free(ctx->Exec);

-	 return GL_FALSE;

-      }

-

-      _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );

-#endif

-      break;

-   case API_OPENGLES:

-      /**

-       * GL_OES_texture_cube_map says

-       * "Initially all texture generation modes are set to REFLECTION_MAP_OES"

-       */

-      for (i = 0; i < MAX_TEXTURE_UNITS; i++) {

-	 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];

-	 texUnit->GenS.Mode = GL_REFLECTION_MAP_NV;

-	 texUnit->GenT.Mode = GL_REFLECTION_MAP_NV;

-	 texUnit->GenR.Mode = GL_REFLECTION_MAP_NV;

-	 texUnit->GenS._ModeBit = TEXGEN_REFLECTION_MAP_NV;

-	 texUnit->GenT._ModeBit = TEXGEN_REFLECTION_MAP_NV;

-	 texUnit->GenR._ModeBit = TEXGEN_REFLECTION_MAP_NV;

-      }

-      break;

-   case API_OPENGLES2:

-      ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;

-      ctx->VertexProgram._MaintainTnlProgram = GL_TRUE;

-      ctx->Point.PointSprite = GL_TRUE;  /* always on for ES 2.x */

-      break;

-   }

-

-   ctx->FirstTimeCurrent = GL_TRUE;

-

-   return GL_TRUE;

-}

-

-

-/**

- * Initialize an OpenGL context.

- */

-GLboolean

-_mesa_initialize_context(struct gl_context *ctx,

-                         const struct gl_config *visual,

-                         struct gl_context *share_list,

-                         const struct dd_function_table *driverFunctions,

-                         void *driverContext)

-{

-   return _mesa_initialize_context_for_api(ctx,

-					   API_OPENGL,

-					   visual,

-					   share_list,

-					   driverFunctions,

-					   driverContext);

-}

-

-

-/**

- * Allocate and initialize a struct gl_context structure.

- * Note that the driver needs to pass in its dd_function_table here since

- * we need to at least call driverFunctions->NewTextureObject to initialize

- * the rendering context.

- *

- * \param api the GL API type to create the context for

- * \param visual a struct gl_config pointer (we copy the struct contents)

- * \param share_list another context to share display lists with or NULL

- * \param driverFunctions points to the dd_function_table into which the

- *        driver has plugged in all its special functions.

- * \param driverContext points to the device driver's private context state

- * 

- * \return pointer to a new __struct gl_contextRec or NULL if error.

- */

-struct gl_context *

-_mesa_create_context_for_api(gl_api api,

-			     const struct gl_config *visual,

-			     struct gl_context *share_list,

-			     const struct dd_function_table *driverFunctions,

-			     void *driverContext)

-{

-   struct gl_context *ctx;

-

-   ASSERT(visual);

-   /*ASSERT(driverContext);*/

-

-   ctx = (struct gl_context *) calloc(1, sizeof(struct gl_context));

-   if (!ctx)

-      return NULL;

-

-   if (_mesa_initialize_context_for_api(ctx, api, visual, share_list,

-					driverFunctions, driverContext)) {

-      return ctx;

-   }

-   else {

-      free(ctx);

-      return NULL;

-   }

-}

-

-

-/**

- * Create an OpenGL context.

- */

-struct gl_context *

-_mesa_create_context(const struct gl_config *visual,

-		     struct gl_context *share_list,

-		     const struct dd_function_table *driverFunctions,

-		     void *driverContext)

-{

-   return _mesa_create_context_for_api(API_OPENGL, visual,

-				       share_list,

-				       driverFunctions,

-				       driverContext);

-}

-

-

-/**

- * Free the data associated with the given context.

- * 

- * But doesn't free the struct gl_context struct itself.

- *

- * \sa _mesa_initialize_context() and init_attrib_groups().

- */

-void

-_mesa_free_context_data( struct gl_context *ctx )

-{

-   if (!_mesa_get_current_context()){

-      /* No current context, but we may need one in order to delete

-       * texture objs, etc.  So temporarily bind the context now.

-       */

-      _mesa_make_current(ctx, NULL, NULL);

-   }

-

-   /* unreference WinSysDraw/Read buffers */

-   _mesa_reference_framebuffer(&ctx->WinSysDrawBuffer, NULL);

-   _mesa_reference_framebuffer(&ctx->WinSysReadBuffer, NULL);

-   _mesa_reference_framebuffer(&ctx->DrawBuffer, NULL);

-   _mesa_reference_framebuffer(&ctx->ReadBuffer, NULL);

-

-   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);

-   _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);

-   _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);

-

-   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);

-   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);

-   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);

-

-   _mesa_free_attrib_data(ctx);

-   _mesa_free_buffer_objects(ctx);

-   _mesa_free_lighting_data( ctx );

-   _mesa_free_eval_data( ctx );

-   _mesa_free_texture_data( ctx );

-   _mesa_free_matrix_data( ctx );

-   _mesa_free_viewport_data( ctx );

-   _mesa_free_program_data(ctx);

-   _mesa_free_shader_state(ctx);

-   _mesa_free_queryobj_data(ctx);

-   _mesa_free_sync_data(ctx);

-   _mesa_free_varray_data(ctx);

-   _mesa_free_transform_feedback(ctx);

-

-   _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);

-

-#if FEATURE_ARB_pixel_buffer_object

-   _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);

-   _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);

-   _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj, NULL);

-#endif

-

-#if FEATURE_ARB_vertex_buffer_object

-   _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);

-   _mesa_reference_buffer_object(ctx, &ctx->Array.ElementArrayBufferObj, NULL);

-#endif

-

-   /* free dispatch tables */

-   free(ctx->Exec);

-   free(ctx->Save);

-

-   /* Shared context state (display lists, textures, etc) */

-   _mesa_release_shared_state( ctx, ctx->Shared );

-

-   /* needs to be after freeing shared state */

-   _mesa_free_display_list_data(ctx);

-

-   if (ctx->Extensions.String)

-      free((void *) ctx->Extensions.String);

-

-   if (ctx->VersionString)

-      free(ctx->VersionString);

-

-   /* unbind the context if it's currently bound */

-   if (ctx == _mesa_get_current_context()) {

-      _mesa_make_current(NULL, NULL, NULL);

-   }

-}

-

-

-/**

- * Destroy a struct gl_context structure.

- *

- * \param ctx GL context.

- * 

- * Calls _mesa_free_context_data() and frees the gl_context object itself.

- */

-void

-_mesa_destroy_context( struct gl_context *ctx )

-{

-   if (ctx) {

-      _mesa_free_context_data(ctx);

-      free( (void *) ctx );

-   }

-}

-

-

-#if _HAVE_FULL_GL

-/**

- * Copy attribute groups from one context to another.

- * 

- * \param src source context

- * \param dst destination context

- * \param mask bitwise OR of GL_*_BIT flags

- *

- * According to the bits specified in \p mask, copies the corresponding

- * attributes from \p src into \p dst.  For many of the attributes a simple \c

- * memcpy is not enough due to the existence of internal pointers in their data

- * structures.

- */

-void

-_mesa_copy_context( const struct gl_context *src, struct gl_context *dst, GLuint mask )

-{

-   if (mask & GL_ACCUM_BUFFER_BIT) {

-      /* OK to memcpy */

-      dst->Accum = src->Accum;

-   }

-   if (mask & GL_COLOR_BUFFER_BIT) {

-      /* OK to memcpy */

-      dst->Color = src->Color;

-   }

-   if (mask & GL_CURRENT_BIT) {

-      /* OK to memcpy */

-      dst->Current = src->Current;

-   }

-   if (mask & GL_DEPTH_BUFFER_BIT) {

-      /* OK to memcpy */

-      dst->Depth = src->Depth;

-   }

-   if (mask & GL_ENABLE_BIT) {

-      /* no op */

-   }

-   if (mask & GL_EVAL_BIT) {

-      /* OK to memcpy */

-      dst->Eval = src->Eval;

-   }

-   if (mask & GL_FOG_BIT) {

-      /* OK to memcpy */

-      dst->Fog = src->Fog;

-   }

-   if (mask & GL_HINT_BIT) {

-      /* OK to memcpy */

-      dst->Hint = src->Hint;

-   }

-   if (mask & GL_LIGHTING_BIT) {

-      GLuint i;

-      /* begin with memcpy */

-      dst->Light = src->Light;

-      /* fixup linked lists to prevent pointer insanity */

-      make_empty_list( &(dst->Light.EnabledList) );

-      for (i = 0; i < MAX_LIGHTS; i++) {

-         if (dst->Light.Light[i].Enabled) {

-            insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));

-         }

-      }

-   }

-   if (mask & GL_LINE_BIT) {

-      /* OK to memcpy */

-      dst->Line = src->Line;

-   }

-   if (mask & GL_LIST_BIT) {

-      /* OK to memcpy */

-      dst->List = src->List;

-   }

-   if (mask & GL_PIXEL_MODE_BIT) {

-      /* OK to memcpy */

-      dst->Pixel = src->Pixel;

-   }

-   if (mask & GL_POINT_BIT) {

-      /* OK to memcpy */

-      dst->Point = src->Point;

-   }

-   if (mask & GL_POLYGON_BIT) {

-      /* OK to memcpy */

-      dst->Polygon = src->Polygon;

-   }

-   if (mask & GL_POLYGON_STIPPLE_BIT) {

-      /* Use loop instead of memcpy due to problem with Portland Group's

-       * C compiler.  Reported by John Stone.

-       */

-      GLuint i;

-      for (i = 0; i < 32; i++) {

-         dst->PolygonStipple[i] = src->PolygonStipple[i];

-      }

-   }

-   if (mask & GL_SCISSOR_BIT) {

-      /* OK to memcpy */

-      dst->Scissor = src->Scissor;

-   }

-   if (mask & GL_STENCIL_BUFFER_BIT) {

-      /* OK to memcpy */

-      dst->Stencil = src->Stencil;

-   }

-   if (mask & GL_TEXTURE_BIT) {

-      /* Cannot memcpy because of pointers */

-      _mesa_copy_texture_state(src, dst);

-   }

-   if (mask & GL_TRANSFORM_BIT) {

-      /* OK to memcpy */

-      dst->Transform = src->Transform;

-   }

-   if (mask & GL_VIEWPORT_BIT) {

-      /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */

-      dst->Viewport.X = src->Viewport.X;

-      dst->Viewport.Y = src->Viewport.Y;

-      dst->Viewport.Width = src->Viewport.Width;

-      dst->Viewport.Height = src->Viewport.Height;

-      dst->Viewport.Near = src->Viewport.Near;

-      dst->Viewport.Far = src->Viewport.Far;

-      _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);

-   }

-

-   /* XXX FIXME:  Call callbacks?

-    */

-   dst->NewState = _NEW_ALL;

-}

-#endif

-

-

-/**

- * Check if the given context can render into the given framebuffer

- * by checking visual attributes.

- *

- * Most of these tests could go away because Mesa is now pretty flexible

- * in terms of mixing rendering contexts with framebuffers.  As long

- * as RGB vs. CI mode agree, we're probably good.

- *

- * \return GL_TRUE if compatible, GL_FALSE otherwise.

- */

-static GLboolean 

-check_compatible(const struct gl_context *ctx,

-                 const struct gl_framebuffer *buffer)

-{

-   const struct gl_config *ctxvis = &ctx->Visual;

-   const struct gl_config *bufvis = &buffer->Visual;

-

-   if (buffer == _mesa_get_incomplete_framebuffer())

-      return GL_TRUE;

-

-#if 0

-   /* disabling this fixes the fgl_glxgears pbuffer demo */

-   if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)

-      return GL_FALSE;

-#endif

-   if (ctxvis->stereoMode && !bufvis->stereoMode)

-      return GL_FALSE;

-   if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)

-      return GL_FALSE;

-   if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)

-      return GL_FALSE;

-   if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)

-      return GL_FALSE;

-   if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)

-      return GL_FALSE;

-   if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)

-      return GL_FALSE;

-   if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)

-      return GL_FALSE;

-#if 0

-   /* disabled (see bug 11161) */

-   if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)

-      return GL_FALSE;

-#endif

-   if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)

-      return GL_FALSE;

-

-   return GL_TRUE;

-}

-

-

-/**

- * Do one-time initialization for the given framebuffer.  Specifically,

- * ask the driver for the window's current size and update the framebuffer

- * object to match.

- * Really, the device driver should totally take care of this.

- */

-static void

-initialize_framebuffer_size(struct gl_context *ctx, struct gl_framebuffer *fb)

-{

-   GLuint width, height;

-   if (ctx->Driver.GetBufferSize) {

-      ctx->Driver.GetBufferSize(fb, &width, &height);

-      if (ctx->Driver.ResizeBuffers)

-         ctx->Driver.ResizeBuffers(ctx, fb, width, height);

-      fb->Initialized = GL_TRUE;

-   }

-}

-

-

-/**

- * Check if the viewport/scissor size has not yet been initialized.

- * Initialize the size if the given width and height are non-zero.

- */

-void

-_mesa_check_init_viewport(struct gl_context *ctx, GLuint width, GLuint height)

-{

-   if (!ctx->ViewportInitialized && width > 0 && height > 0) {

-      /* Note: set flag here, before calling _mesa_set_viewport(), to prevent

-       * potential infinite recursion.

-       */

-      ctx->ViewportInitialized = GL_TRUE;

-      _mesa_set_viewport(ctx, 0, 0, width, height);

-      _mesa_set_scissor(ctx, 0, 0, width, height);

-   }

-}

-

-

-/**

- * Bind the given context to the given drawBuffer and readBuffer and

- * make it the current context for the calling thread.

- * We'll render into the drawBuffer and read pixels from the

- * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).

- *

- * We check that the context's and framebuffer's visuals are compatible

- * and return immediately if they're not.

- *

- * \param newCtx  the new GL context. If NULL then there will be no current GL

- *                context.

- * \param drawBuffer  the drawing framebuffer

- * \param readBuffer  the reading framebuffer

- */

-GLboolean

-_mesa_make_current( struct gl_context *newCtx,

-                    struct gl_framebuffer *drawBuffer,

-                    struct gl_framebuffer *readBuffer )

-{

-   GET_CURRENT_CONTEXT(curCtx);

-

-   if (MESA_VERBOSE & VERBOSE_API)

-      _mesa_debug(newCtx, "_mesa_make_current()\n");

-

-   /* Check that the context's and framebuffer's visuals are compatible.

-    */

-   if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {

-      if (!check_compatible(newCtx, drawBuffer)) {

-         _mesa_warning(newCtx,

-              "MakeCurrent: incompatible visuals for context and drawbuffer");

-         return GL_FALSE;

-      }

-   }

-   if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {

-      if (!check_compatible(newCtx, readBuffer)) {

-         _mesa_warning(newCtx,

-              "MakeCurrent: incompatible visuals for context and readbuffer");

-         return GL_FALSE;

-      }

-   }

-

-   if (curCtx && 

-      (curCtx->WinSysDrawBuffer || curCtx->WinSysReadBuffer) && /* make sure this context is valid for flushing */

-      curCtx != newCtx)

-      _mesa_flush(curCtx);

-

-   /* We used to call _glapi_check_multithread() here.  Now do it in drivers */

-   _glapi_set_context((void *) newCtx);

-   ASSERT(_mesa_get_current_context() == newCtx);

-

-   if (!newCtx) {

-      _glapi_set_dispatch(NULL);  /* none current */

-   }

-   else {

-      _glapi_set_dispatch(newCtx->CurrentDispatch);

-

-      if (drawBuffer && readBuffer) {

-	 /* TODO: check if newCtx and buffer's visual match??? */

-

-         ASSERT(drawBuffer->Name == 0);

-         ASSERT(readBuffer->Name == 0);

-         _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);

-         _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);

-

-         /*

-          * Only set the context's Draw/ReadBuffer fields if they're NULL

-          * or not bound to a user-created FBO.

-          */

-         if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {

-            /* KW: merge conflict here, revisit. 

-             */

-            /* fix up the fb fields - these will end up wrong otherwise

-             * if the DRIdrawable changes, and everything relies on them.

-             * This is a bit messy (same as needed in _mesa_BindFramebufferEXT)

-             */

-            unsigned int i;

-            GLenum buffers[MAX_DRAW_BUFFERS];

-

-            _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);

-

-            for(i = 0; i < newCtx->Const.MaxDrawBuffers; i++) {

-               buffers[i] = newCtx->Color.DrawBuffer[i];

-            }

-

-            _mesa_drawbuffers(newCtx, newCtx->Const.MaxDrawBuffers,

-                              buffers, NULL);

-         }

-         if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {

-            _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);

-         }

-

-         /* XXX only set this flag if we're really changing the draw/read

-          * framebuffer bindings.

-          */

-	 newCtx->NewState |= _NEW_BUFFERS;

-

-#if 1

-         /* We want to get rid of these lines: */

-

-#if _HAVE_FULL_GL

-         if (!drawBuffer->Initialized) {

-            initialize_framebuffer_size(newCtx, drawBuffer);

-         }

-         if (readBuffer != drawBuffer && !readBuffer->Initialized) {

-            initialize_framebuffer_size(newCtx, readBuffer);

-         }

-

-	 _mesa_resizebuffers(newCtx);

-#endif

-

-#else

-         /* We want the drawBuffer and readBuffer to be initialized by

-          * the driver.

-          * This generally means the Width and Height match the actual

-          * window size and the renderbuffers (both hardware and software

-          * based) are allocated to match.  The later can generally be

-          * done with a call to _mesa_resize_framebuffer().

-          *

-          * It's theoretically possible for a buffer to have zero width

-          * or height, but for now, assert check that the driver did what's

-          * expected of it.

-          */

-         ASSERT(drawBuffer->Width > 0);

-         ASSERT(drawBuffer->Height > 0);

-#endif

-

-         if (drawBuffer) {

-            _mesa_check_init_viewport(newCtx,

-                                      drawBuffer->Width, drawBuffer->Height);

-         }

-      }

-

-      if (newCtx->FirstTimeCurrent) {

-         _mesa_compute_version(newCtx);

-

-         newCtx->Extensions.String = _mesa_make_extension_string(newCtx);

-

-         check_context_limits(newCtx);

-

-         /* We can use this to help debug user's problems.  Tell them to set

-          * the MESA_INFO env variable before running their app.  Then the

-          * first time each context is made current we'll print some useful

-          * information.

-          */

-	 if (_mesa_getenv("MESA_INFO")) {

-	    _mesa_print_info();

-	 }

-

-	 newCtx->FirstTimeCurrent = GL_FALSE;

-      }

-   }

-   

-   return GL_TRUE;

-}

-

-

-/**

- * Make context 'ctx' share the display lists, textures and programs

- * that are associated with 'ctxToShare'.

- * Any display lists, textures or programs associated with 'ctx' will

- * be deleted if nobody else is sharing them.

- */

-GLboolean

-_mesa_share_state(struct gl_context *ctx, struct gl_context *ctxToShare)

-{

-   if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {

-      struct gl_shared_state *oldSharedState = ctx->Shared;

-

-      ctx->Shared = ctxToShare->Shared;

-      

-      _glthread_LOCK_MUTEX(ctx->Shared->Mutex);

-      ctx->Shared->RefCount++;

-      _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);

-

-      update_default_objects(ctx);

-

-      _mesa_release_shared_state(ctx, oldSharedState);

-

-      return GL_TRUE;

-   }

-   else {

-      return GL_FALSE;

-   }

-}

-

-

-

-/**

- * \return pointer to the current GL context for this thread.

- * 

- * Calls _glapi_get_context(). This isn't the fastest way to get the current

- * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in

- * context.h.

- */

-struct gl_context *

-_mesa_get_current_context( void )

-{

-   return (struct gl_context *) _glapi_get_context();

-}

-

-

-/**

- * Get context's current API dispatch table.

- *

- * It'll either be the immediate-mode execute dispatcher or the display list

- * compile dispatcher.

- * 

- * \param ctx GL context.

- *

- * \return pointer to dispatch_table.

- *

- * Simply returns __struct gl_contextRec::CurrentDispatch.

- */

-struct _glapi_table *

-_mesa_get_dispatch(struct gl_context *ctx)

-{

-   return ctx->CurrentDispatch;

-}

-

-/*@}*/

-

-

-/**********************************************************************/

-/** \name Miscellaneous functions                                     */

-/**********************************************************************/

-/*@{*/

-

-/**

- * Record an error.

- *

- * \param ctx GL context.

- * \param error error code.

- * 

- * Records the given error code and call the driver's dd_function_table::Error

- * function if defined.

- *

- * \sa

- * This is called via _mesa_error().

- */

-void

-_mesa_record_error(struct gl_context *ctx, GLenum error)

-{

-   if (!ctx)

-      return;

-

-   if (ctx->ErrorValue == GL_NO_ERROR) {

-      ctx->ErrorValue = error;

-   }

-

-   /* Call device driver's error handler, if any.  This is used on the Mac. */

-   if (ctx->Driver.Error) {

-      ctx->Driver.Error(ctx);

-   }

-}

-

-

-/**

- * Flush commands and wait for completion.

- */

-void

-_mesa_finish(struct gl_context *ctx)

-{

-   FLUSH_CURRENT( ctx, 0 );

-   if (ctx->Driver.Finish) {

-      ctx->Driver.Finish(ctx);

-   }

-}

-

-

-/**

- * Flush commands.

- */

-void

-_mesa_flush(struct gl_context *ctx)

-{

-   FLUSH_CURRENT( ctx, 0 );

-   if (ctx->Driver.Flush) {

-      ctx->Driver.Flush(ctx);

-   }

-}

-

-

-

-/**

- * Execute glFinish().

- *

- * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the

- * dd_function_table::Finish driver callback, if not NULL.

- */

-void GLAPIENTRY

-_mesa_Finish(void)

-{

-   GET_CURRENT_CONTEXT(ctx);

-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

-   _mesa_finish(ctx);

-}

-

-

-/**

- * Execute glFlush().

- *

- * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the

- * dd_function_table::Flush driver callback, if not NULL.

- */

-void GLAPIENTRY

-_mesa_Flush(void)

-{

-   GET_CURRENT_CONTEXT(ctx);

-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

-   _mesa_flush(ctx);

-}

-

-

-/**

- * Set mvp_with_dp4 flag.  If a driver has a preference for DP4 over

- * MUL/MAD, or vice versa, call this function to register that.

- * Otherwise we default to MUL/MAD.

- */

-void

-_mesa_set_mvp_with_dp4( struct gl_context *ctx,

-                        GLboolean flag )

-{

-   ctx->mvp_with_dp4 = flag;

-}

-

-

-

-/**

- * Prior to drawing anything with glBegin, glDrawArrays, etc. this function

- * is called to see if it's valid to render.  This involves checking that

- * the current shader is valid and the framebuffer is complete.

- * If an error is detected it'll be recorded here.

- * \return GL_TRUE if OK to render, GL_FALSE if not

- */

-GLboolean

-_mesa_valid_to_render(struct gl_context *ctx, const char *where)

-{

-   bool vert_from_glsl_shader = false;

-   bool geom_from_glsl_shader = false;

-   bool frag_from_glsl_shader = false;

-

-   /* This depends on having up to date derived state (shaders) */

-   if (ctx->NewState)

-      _mesa_update_state(ctx);

-

-   if (ctx->Shader.CurrentVertexProgram) {

-      vert_from_glsl_shader = true;

-

-      if (!ctx->Shader.CurrentVertexProgram->LinkStatus) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "%s(shader not linked)", where);

-         return GL_FALSE;

-      }

-#if 0 /* not normally enabled */

-      {

-         char errMsg[100];

-         if (!_mesa_validate_shader_program(ctx,

-					    ctx->Shader.CurrentVertexProgram,

-                                            errMsg)) {

-            _mesa_warning(ctx, "Shader program %u is invalid: %s",

-                          ctx->Shader.CurrentVertexProgram->Name, errMsg);

-         }

-      }

-#endif

-   }

-

-   if (ctx->Shader.CurrentGeometryProgram) {

-      geom_from_glsl_shader = true;

-

-      if (!ctx->Shader.CurrentGeometryProgram->LinkStatus) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "%s(shader not linked)", where);

-         return GL_FALSE;

-      }

-#if 0 /* not normally enabled */

-      {

-         char errMsg[100];

-         if (!_mesa_validate_shader_program(ctx,

-					    ctx->Shader.CurrentGeometryProgram,

-                                            errMsg)) {

-            _mesa_warning(ctx, "Shader program %u is invalid: %s",

-                          ctx->Shader.CurrentGeometryProgram->Name, errMsg);

-         }

-      }

-#endif

-   }

-

-   if (ctx->Shader.CurrentFragmentProgram) {

-      frag_from_glsl_shader = true;

-

-      if (!ctx->Shader.CurrentFragmentProgram->LinkStatus) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "%s(shader not linked)", where);

-         return GL_FALSE;

-      }

-#if 0 /* not normally enabled */

-      {

-         char errMsg[100];

-         if (!_mesa_validate_shader_program(ctx,

-					    ctx->Shader.CurrentFragmentProgram,

-                                            errMsg)) {

-            _mesa_warning(ctx, "Shader program %u is invalid: %s",

-                          ctx->Shader.CurrentFragmentProgram->Name, errMsg);

-         }

-      }

-#endif

-   }

-

-   /* Any shader stages that are not supplied by the GLSL shader and have

-    * assembly shaders enabled must now be validated.

-    */

-   if (!vert_from_glsl_shader

-       && ctx->VertexProgram.Enabled && !ctx->VertexProgram._Enabled) {

-      _mesa_error(ctx, GL_INVALID_OPERATION,

-		  "%s(vertex program not valid)", where);

-      return GL_FALSE;

-   }

-

-   /* FINISHME: If GL_NV_geometry_program4 is ever supported, the current

-    * FINISHME: geometry program should validated here.

-    */

-   (void) geom_from_glsl_shader;

-

-   if (!frag_from_glsl_shader) {

-      if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {

-	 _mesa_error(ctx, GL_INVALID_OPERATION,

-		     "%s(fragment program not valid)", where);

-	 return GL_FALSE;

-      }

-

-      /* If drawing to integer-valued color buffers, there must be an

-       * active fragment shader (GL_EXT_texture_integer).

-       */

-      if (ctx->DrawBuffer && ctx->DrawBuffer->_IntegerColor) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "%s(integer format but no fragment shader)", where);

-         return GL_FALSE;

-      }

-   }

-

-   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {

-      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,

-                  "%s(incomplete framebuffer)", where);

-      return GL_FALSE;

-   }

-

-#ifdef DEBUG

-   if (ctx->Shader.Flags & GLSL_LOG) {

-      struct gl_shader_program *shProg[MESA_SHADER_TYPES];

-      gl_shader_type i;

-

-      shProg[MESA_SHADER_VERTEX] = ctx->Shader.CurrentVertexProgram;

-      shProg[MESA_SHADER_GEOMETRY] = ctx->Shader.CurrentGeometryProgram;

-      shProg[MESA_SHADER_FRAGMENT] = ctx->Shader.CurrentFragmentProgram;

-

-      for (i = 0; i < MESA_SHADER_TYPES; i++) {

-	 struct gl_shader *sh;

-

-	 if (shProg[i] == NULL || shProg[i]->_Used

-	     || shProg[i]->_LinkedShaders[i] == NULL)

-	    continue;

-

-	 /* This is the first time this shader is being used.

-	  * Append shader's constants/uniforms to log file.

-	  *

-	  * The logic is a little odd here.  We only want to log data for each

-	  * shader target that will actually be used, and we only want to log

-	  * it once.  It's possible to have a program bound to the vertex

-	  * shader target that also supplied a fragment shader.  If that

-	  * program isn't also bound to the fragment shader target we don't

-	  * want to log its fragment data.

-	  */

-	 sh = shProg[i]->_LinkedShaders[i];

-	 switch (sh->Type) {

-	 case GL_VERTEX_SHADER:

-	    _mesa_append_uniforms_to_file(sh, &shProg[i]->VertexProgram->Base);

-	    break;

-

-	 case GL_GEOMETRY_SHADER_ARB:

-	    _mesa_append_uniforms_to_file(sh,

-					  &shProg[i]->GeometryProgram->Base);

-	    break;

-

-	 case GL_FRAGMENT_SHADER:

-	    _mesa_append_uniforms_to_file(sh,

-					  &shProg[i]->FragmentProgram->Base);

-	    break;

-	 }

-      }

-

-      for (i = 0; i < MESA_SHADER_TYPES; i++) {

-	 if (shProg[i] != NULL)

-	    shProg[i]->_Used = GL_TRUE;

-      }

-   }

-#endif

-

-   return GL_TRUE;

-}

-

-

-/*@}*/

+/*
+ * Mesa 3-D graphics library
+ * Version:  7.3
+ *
+ * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
+ * Copyright (C) 2008  VMware, Inc.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file context.c
+ * Mesa context/visual/framebuffer management functions.
+ * \author Brian Paul
+ */
+
+/**
+ * \mainpage Mesa Main Module
+ *
+ * \section MainIntroduction Introduction
+ *
+ * The Mesa Main module consists of all the files in the main/ directory.
+ * Among the features of this module are:
+ * <UL>
+ * <LI> Structures to represent most GL state </LI>
+ * <LI> State set/get functions </LI>
+ * <LI> Display lists </LI>
+ * <LI> Texture unit, object and image handling </LI>
+ * <LI> Matrix and attribute stacks </LI>
+ * </UL>
+ *
+ * Other modules are responsible for API dispatch, vertex transformation,
+ * point/line/triangle setup, rasterization, vertex array caching,
+ * vertex/fragment programs/shaders, etc.
+ *
+ *
+ * \section AboutDoxygen About Doxygen
+ *
+ * If you're viewing this information as Doxygen-generated HTML you'll
+ * see the documentation index at the top of this page.
+ *
+ * The first line lists the Mesa source code modules.
+ * The second line lists the indexes available for viewing the documentation
+ * for each module.
+ *
+ * Selecting the <b>Main page</b> link will display a summary of the module
+ * (this page).
+ *
+ * Selecting <b>Data Structures</b> will list all C structures.
+ *
+ * Selecting the <b>File List</b> link will list all the source files in
+ * the module.
+ * Selecting a filename will show a list of all functions defined in that file.
+ *
+ * Selecting the <b>Data Fields</b> link will display a list of all
+ * documented structure members.
+ *
+ * Selecting the <b>Globals</b> link will display a list
+ * of all functions, structures, global variables and macros in the module.
+ *
+ */
+
+
+#include "glheader.h"
+#include "mfeatures.h"
+#include "imports.h"
+#include "accum.h"
+#include "api_exec.h"
+#include "arrayobj.h"
+#include "attrib.h"
+#include "blend.h"
+#include "buffers.h"
+#include "bufferobj.h"
+#include "context.h"
+#include "cpuinfo.h"
+#include "debug.h"
+#include "depth.h"
+#include "dlist.h"
+#include "eval.h"
+#include "extensions.h"
+#include "fbobject.h"
+#include "feedback.h"
+#include "fog.h"
+#include "formats.h"
+#include "framebuffer.h"
+#include "hint.h"
+#include "hash.h"
+#include "light.h"
+#include "lines.h"
+#include "macros.h"
+#include "matrix.h"
+#include "multisample.h"
+#include "pixel.h"
+#include "pixelstore.h"
+#include "points.h"
+#include "polygon.h"
+#include "queryobj.h"
+#include "syncobj.h"
+#include "rastpos.h"
+#include "remap.h"
+#include "scissor.h"
+#include "shared.h"
+#include "shaderobj.h"
+#include "simple_list.h"
+#include "state.h"
+#include "stencil.h"
+#include "texcompress_s3tc.h"
+#include "texstate.h"
+#include "transformfeedback.h"
+#include "mtypes.h"
+#include "varray.h"
+#include "version.h"
+#include "viewport.h"
+#include "vtxfmt.h"
+#include "program/program.h"
+#include "program/prog_print.h"
+#if _HAVE_FULL_GL
+#include "math/m_matrix.h"
+#endif
+#include "main/dispatch.h" /* for _gloffset_COUNT */
+
+#ifdef USE_SPARC_ASM
+#include "sparc/sparc.h"
+#endif
+
+#include "glsl_parser_extras.h"
+#include <stdbool.h>
+
+
+#ifndef MESA_VERBOSE
+int MESA_VERBOSE = 0;
+#endif
+
+#ifndef MESA_DEBUG_FLAGS
+int MESA_DEBUG_FLAGS = 0;
+#endif
+
+
+/* ubyte -> float conversion */
+GLfloat _mesa_ubyte_to_float_color_tab[256];
+
+
+
+/**
+ * Swap buffers notification callback.
+ * 
+ * \param ctx GL context.
+ *
+ * Called by window system just before swapping buffers.
+ * We have to finish any pending rendering.
+ */
+void
+_mesa_notifySwapBuffers(struct gl_context *ctx)
+{
+   if (MESA_VERBOSE & VERBOSE_SWAPBUFFERS)
+      _mesa_debug(ctx, "SwapBuffers\n");
+   FLUSH_CURRENT( ctx, 0 );
+   if (ctx->Driver.Flush) {
+      ctx->Driver.Flush(ctx);
+   }
+}
+
+
+/**********************************************************************/
+/** \name GL Visual allocation/destruction                            */
+/**********************************************************************/
+/*@{*/
+
+/**
+ * Allocates a struct gl_config structure and initializes it via
+ * _mesa_initialize_visual().
+ * 
+ * \param dbFlag double buffering
+ * \param stereoFlag stereo buffer
+ * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
+ * is acceptable but the actual depth type will be GLushort or GLuint as
+ * needed.
+ * \param stencilBits requested minimum bits per stencil buffer value
+ * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.
+ * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
+ * \param redBits number of bits per color component in frame buffer for RGB(A)
+ * mode.  We always use 8 in core Mesa though.
+ * \param greenBits same as above.
+ * \param blueBits same as above.
+ * \param alphaBits same as above.
+ * \param numSamples not really used.
+ * 
+ * \return pointer to new struct gl_config or NULL if requested parameters can't be
+ * met.
+ *
+ * \note Need to add params for level and numAuxBuffers (at least)
+ */
+struct gl_config *
+_mesa_create_visual( GLboolean dbFlag,
+                     GLboolean stereoFlag,
+                     GLint redBits,
+                     GLint greenBits,
+                     GLint blueBits,
+                     GLint alphaBits,
+                     GLint depthBits,
+                     GLint stencilBits,
+                     GLint accumRedBits,
+                     GLint accumGreenBits,
+                     GLint accumBlueBits,
+                     GLint accumAlphaBits,
+                     GLint numSamples )
+{
+   struct gl_config *vis = CALLOC_STRUCT(gl_config);
+   if (vis) {
+      if (!_mesa_initialize_visual(vis, dbFlag, stereoFlag,
+                                   redBits, greenBits, blueBits, alphaBits,
+                                   depthBits, stencilBits,
+                                   accumRedBits, accumGreenBits,
+                                   accumBlueBits, accumAlphaBits,
+                                   numSamples)) {
+         free(vis);
+         return NULL;
+      }
+   }
+   return vis;
+}
+
+
+/**
+ * Makes some sanity checks and fills in the fields of the struct
+ * gl_config object with the given parameters.  If the caller needs to
+ * set additional fields, he should just probably init the whole
+ * gl_config object himself.
+ *
+ * \return GL_TRUE on success, or GL_FALSE on failure.
+ *
+ * \sa _mesa_create_visual() above for the parameter description.
+ */
+GLboolean
+_mesa_initialize_visual( struct gl_config *vis,
+                         GLboolean dbFlag,
+                         GLboolean stereoFlag,
+                         GLint redBits,
+                         GLint greenBits,
+                         GLint blueBits,
+                         GLint alphaBits,
+                         GLint depthBits,
+                         GLint stencilBits,
+                         GLint accumRedBits,
+                         GLint accumGreenBits,
+                         GLint accumBlueBits,
+                         GLint accumAlphaBits,
+                         GLint numSamples )
+{
+   assert(vis);
+
+   if (depthBits < 0 || depthBits > 32) {
+      return GL_FALSE;
+   }
+   if (stencilBits < 0 || stencilBits > STENCIL_BITS) {
+      return GL_FALSE;
+   }
+   assert(accumRedBits >= 0);
+   assert(accumGreenBits >= 0);
+   assert(accumBlueBits >= 0);
+   assert(accumAlphaBits >= 0);
+
+   vis->rgbMode          = GL_TRUE;
+   vis->doubleBufferMode = dbFlag;
+   vis->stereoMode       = stereoFlag;
+
+   vis->redBits          = redBits;
+   vis->greenBits        = greenBits;
+   vis->blueBits         = blueBits;
+   vis->alphaBits        = alphaBits;
+   vis->rgbBits          = redBits + greenBits + blueBits;
+
+   vis->indexBits      = 0;
+   vis->depthBits      = depthBits;
+   vis->stencilBits    = stencilBits;
+
+   vis->accumRedBits   = accumRedBits;
+   vis->accumGreenBits = accumGreenBits;
+   vis->accumBlueBits  = accumBlueBits;
+   vis->accumAlphaBits = accumAlphaBits;
+
+   vis->haveAccumBuffer   = accumRedBits > 0;
+   vis->haveDepthBuffer   = depthBits > 0;
+   vis->haveStencilBuffer = stencilBits > 0;
+
+   vis->numAuxBuffers = 0;
+   vis->level = 0;
+   vis->sampleBuffers = numSamples > 0 ? 1 : 0;
+   vis->samples = numSamples;
+
+   return GL_TRUE;
+}
+
+
+/**
+ * Destroy a visual and free its memory.
+ *
+ * \param vis visual.
+ * 
+ * Frees the visual structure.
+ */
+void
+_mesa_destroy_visual( struct gl_config *vis )
+{
+   free(vis);
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Context allocation, initialization, destroying
+ *
+ * The purpose of the most initialization functions here is to provide the
+ * default state values according to the OpenGL specification.
+ */
+/**********************************************************************/
+/*@{*/
+
+
+/**
+ * This is lame.  gdb only seems to recognize enum types that are
+ * actually used somewhere.  We want to be able to print/use enum
+ * values such as TEXTURE_2D_INDEX in gdb.  But we don't actually use
+ * the gl_texture_index type anywhere.  Thus, this lame function.
+ */
+static void
+dummy_enum_func(void)
+{
+   gl_buffer_index bi = BUFFER_FRONT_LEFT;
+   gl_face_index fi = FACE_POS_X;
+   gl_frag_attrib fa = FRAG_ATTRIB_WPOS;
+   gl_frag_result fr = FRAG_RESULT_DEPTH;
+   gl_texture_index ti = TEXTURE_2D_ARRAY_INDEX;
+   gl_vert_attrib va = VERT_ATTRIB_POS;
+   gl_vert_result vr = VERT_RESULT_HPOS;
+   gl_geom_attrib ga = GEOM_ATTRIB_POSITION;
+   gl_geom_result gr = GEOM_RESULT_POS;
+
+   (void) bi;
+   (void) fi;
+   (void) fa;
+   (void) fr;
+   (void) ti;
+   (void) va;
+   (void) vr;
+   (void) ga;
+   (void) gr;
+}
+
+
+/**
+ * One-time initialization mutex lock.
+ *
+ * \sa Used by one_time_init().
+ */
+_glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
+
+
+
+/**
+ * Calls all the various one-time-init functions in Mesa.
+ *
+ * While holding a global mutex lock, calls several initialization functions,
+ * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
+ * defined.
+ *
+ * \sa _math_init().
+ */
+static void
+one_time_init( struct gl_context *ctx )
+{
+   static GLbitfield api_init_mask = 0x0;
+
+   _glthread_LOCK_MUTEX(OneTimeLock);
+
+   /* truly one-time init */
+   if (!api_init_mask) {
+      GLuint i;
+
+      /* do some implementation tests */
+      assert( sizeof(GLbyte) == 1 );
+      assert( sizeof(GLubyte) == 1 );
+      assert( sizeof(GLshort) == 2 );
+      assert( sizeof(GLushort) == 2 );
+      assert( sizeof(GLint) == 4 );
+      assert( sizeof(GLuint) == 4 );
+
+      _mesa_get_cpu_features();
+
+      _mesa_init_sqrt_table();
+
+      /* context dependence is never a one-time thing... */
+      _mesa_init_get_hash(ctx);
+
+      for (i = 0; i < 256; i++) {
+         _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
+      }
+
+#if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
+      if (MESA_VERBOSE != 0) {
+	 _mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",
+		     MESA_VERSION_STRING, __DATE__, __TIME__);
+      }
+#endif
+
+#ifdef DEBUG
+      _mesa_test_formats();
+#endif
+   }
+
+   /* per-API one-time init */
+   if (!(api_init_mask & (1 << ctx->API))) {
+      /*
+       * This is fine as ES does not use the remap table, but it may not be
+       * future-proof.  We cannot always initialize the remap table because
+       * when an app is linked to libGLES*, there are not enough dynamic
+       * entries.
+       */
+      if (ctx->API == API_OPENGL)
+         _mesa_init_remap_table();
+   }
+
+   api_init_mask |= 1 << ctx->API;
+
+   _glthread_UNLOCK_MUTEX(OneTimeLock);
+
+   /* Hopefully atexit() is widely available.  If not, we may need some
+    * #ifdef tests here.
+    */
+   atexit(_mesa_destroy_shader_compiler);
+
+   dummy_enum_func();
+}
+
+
+/**
+ * Initialize fields of gl_current_attrib (aka ctx->Current.*)
+ */
+static void
+_mesa_init_current(struct gl_context *ctx)
+{
+   GLuint i;
+
+   /* Init all to (0,0,0,1) */
+   for (i = 0; i < Elements(ctx->Current.Attrib); i++) {
+      ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
+   }
+
+   /* redo special cases: */
+   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 0.0 );
+   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
+   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
+   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
+   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
+   ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
+}
+
+
+/**
+ * Init vertex/fragment/geometry program limits.
+ * Important: drivers should override these with actual limits.
+ */
+static void
+init_program_limits(GLenum type, struct gl_program_constants *prog)
+{
+   prog->MaxInstructions = MAX_PROGRAM_INSTRUCTIONS;
+   prog->MaxAluInstructions = MAX_PROGRAM_INSTRUCTIONS;
+   prog->MaxTexInstructions = MAX_PROGRAM_INSTRUCTIONS;
+   prog->MaxTexIndirections = MAX_PROGRAM_INSTRUCTIONS;
+   prog->MaxTemps = MAX_PROGRAM_TEMPS;
+   prog->MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
+   prog->MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
+   prog->MaxUniformComponents = 4 * MAX_UNIFORMS;
+
+   switch (type) {
+   case GL_VERTEX_PROGRAM_ARB:
+      prog->MaxParameters = MAX_VERTEX_PROGRAM_PARAMS;
+      prog->MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
+      prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
+      break;
+   case GL_FRAGMENT_PROGRAM_ARB:
+      prog->MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
+      prog->MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
+      prog->MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
+      break;
+   case MESA_GEOMETRY_PROGRAM:
+      prog->MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;
+      prog->MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
+      prog->MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
+
+      prog->MaxGeometryTextureImageUnits = MAX_GEOMETRY_TEXTURE_IMAGE_UNITS;
+      prog->MaxGeometryVaryingComponents = MAX_GEOMETRY_VARYING_COMPONENTS;
+      prog->MaxVertexVaryingComponents = MAX_VERTEX_VARYING_COMPONENTS;
+      prog->MaxGeometryUniformComponents = MAX_GEOMETRY_UNIFORM_COMPONENTS;
+      prog->MaxGeometryOutputVertices = MAX_GEOMETRY_OUTPUT_VERTICES;
+      prog->MaxGeometryTotalOutputComponents = MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS;
+      break;
+   default:
+      assert(0 && "Bad program type in init_program_limits()");
+   }
+
+   /* Set the native limits to zero.  This implies that there is no native
+    * support for shaders.  Let the drivers fill in the actual values.
+    */
+   prog->MaxNativeInstructions = 0;
+   prog->MaxNativeAluInstructions = 0;
+   prog->MaxNativeTexInstructions = 0;
+   prog->MaxNativeTexIndirections = 0;
+   prog->MaxNativeAttribs = 0;
+   prog->MaxNativeTemps = 0;
+   prog->MaxNativeAddressRegs = 0;
+   prog->MaxNativeParameters = 0;
+
+   /* Set GLSL datatype range/precision info assuming IEEE float values.
+    * Drivers should override these defaults as needed.
+    */
+   prog->MediumFloat.RangeMin = 127;
+   prog->MediumFloat.RangeMax = 127;
+   prog->MediumFloat.Precision = 23;
+   prog->LowFloat = prog->HighFloat = prog->MediumFloat;
+   /* assume ints are stored as floats for now */
+   prog->LowInt = prog->MediumInt = prog->HighInt = prog->MediumFloat;
+}
+
+
+/**
+ * Initialize fields of gl_constants (aka ctx->Const.*).
+ * Use defaults from config.h.  The device drivers will often override
+ * some of these values (such as number of texture units).
+ */
+static void 
+_mesa_init_constants(struct gl_context *ctx)
+{
+   assert(ctx);
+
+   /* Constants, may be overriden (usually only reduced) by device drivers */
+   ctx->Const.MaxTextureMbytes = MAX_TEXTURE_MBYTES;
+   ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
+   ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
+   ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
+   ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
+   ctx->Const.MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;
+   ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
+   ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
+   ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
+                                     ctx->Const.MaxTextureImageUnits);
+   ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
+   ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
+   ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
+   ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
+   ctx->Const.MinPointSize = MIN_POINT_SIZE;
+   ctx->Const.MaxPointSize = MAX_POINT_SIZE;
+   ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
+   ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
+   ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
+   ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
+   ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
+   ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
+   ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
+   ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
+   ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
+   ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
+   ctx->Const.MaxLights = MAX_LIGHTS;
+   ctx->Const.MaxShininess = 128.0;
+   ctx->Const.MaxSpotExponent = 128.0;
+   ctx->Const.MaxViewportWidth = MAX_WIDTH;
+   ctx->Const.MaxViewportHeight = MAX_HEIGHT;
+#if FEATURE_ARB_vertex_program
+   init_program_limits(GL_VERTEX_PROGRAM_ARB, &ctx->Const.VertexProgram);
+#endif
+#if FEATURE_ARB_fragment_program
+   init_program_limits(GL_FRAGMENT_PROGRAM_ARB, &ctx->Const.FragmentProgram);
+#endif
+#if FEATURE_ARB_geometry_shader4
+   init_program_limits(MESA_GEOMETRY_PROGRAM, &ctx->Const.GeometryProgram);
+#endif
+   ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
+   ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
+
+   /* CheckArrayBounds is overriden by drivers/x11 for X server */
+   ctx->Const.CheckArrayBounds = GL_FALSE;
+
+   /* GL_ARB_draw_buffers */
+   ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
+
+#if FEATURE_EXT_framebuffer_object
+   ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
+   ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
+#endif
+
+#if FEATURE_ARB_vertex_shader
+   ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
+   ctx->Const.MaxCombinedTextureImageUnits = MAX_COMBINED_TEXTURE_IMAGE_UNITS;
+   ctx->Const.MaxVarying = MAX_VARYING;
+#endif
+
+   /* Shading language version */
+   if (ctx->API == API_OPENGL) {
+      ctx->Const.GLSLVersion = 120;
+   }
+   else if (ctx->API == API_OPENGLES2) {
+      ctx->Const.GLSLVersion = 100;
+   }
+   else if (ctx->API == API_OPENGLES) {
+      ctx->Const.GLSLVersion = 0; /* GLSL not supported */
+   }
+
+   /* GL_ARB_framebuffer_object */
+   ctx->Const.MaxSamples = 0;
+
+   /* GL_ARB_sync */
+   ctx->Const.MaxServerWaitTimeout = (GLuint64) ~0;
+
+   /* GL_ATI_envmap_bumpmap */
+   ctx->Const.SupportedBumpUnits = SUPPORTED_ATI_BUMP_UNITS;
+
+   /* GL_EXT_provoking_vertex */
+   ctx->Const.QuadsFollowProvokingVertexConvention = GL_TRUE;
+
+   /* GL_EXT_transform_feedback */
+   ctx->Const.MaxTransformFeedbackSeparateAttribs = MAX_FEEDBACK_ATTRIBS;
+   ctx->Const.MaxTransformFeedbackSeparateComponents = 4 * MAX_FEEDBACK_ATTRIBS;
+   ctx->Const.MaxTransformFeedbackInterleavedComponents = 4 * MAX_FEEDBACK_ATTRIBS;
+
+   /* GL 3.2: hard-coded for now: */
+   ctx->Const.ProfileMask = GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;
+
+   /** GL_EXT_gpu_shader4 */
+   ctx->Const.MinProgramTexelOffset = -8;
+   ctx->Const.MaxProgramTexelOffset = 7;
+}
+
+
+/**
+ * Do some sanity checks on the limits/constants for the given context.
+ * Only called the first time a context is bound.
+ */
+static void
+check_context_limits(struct gl_context *ctx)
+{
+   /* check that we don't exceed the size of various bitfields */
+   assert(VERT_RESULT_MAX <=
+	  (8 * sizeof(ctx->VertexProgram._Current->Base.OutputsWritten)));
+   assert(FRAG_ATTRIB_MAX <=
+	  (8 * sizeof(ctx->FragmentProgram._Current->Base.InputsRead)));
+
+   assert(MAX_COMBINED_TEXTURE_IMAGE_UNITS <= 8 * sizeof(GLbitfield));
+
+   /* shader-related checks */
+   assert(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
+   assert(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
+
+   assert(MAX_NV_FRAGMENT_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
+   assert(MAX_NV_VERTEX_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
+   assert(MAX_NV_VERTEX_PROGRAM_INPUTS <= VERT_ATTRIB_MAX);
+   assert(MAX_NV_VERTEX_PROGRAM_OUTPUTS <= VERT_RESULT_MAX);
+
+   /* Texture unit checks */
+   assert(ctx->Const.MaxTextureImageUnits > 0);
+   assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
+   assert(ctx->Const.MaxTextureCoordUnits > 0);
+   assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
+   assert(ctx->Const.MaxTextureUnits > 0);
+   assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
+   assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
+   assert(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
+                                             ctx->Const.MaxTextureCoordUnits));
+   assert(ctx->Const.MaxCombinedTextureImageUnits > 0);
+   assert(ctx->Const.MaxCombinedTextureImageUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
+   assert(ctx->Const.MaxTextureCoordUnits <= MAX_COMBINED_TEXTURE_IMAGE_UNITS);
+   /* number of coord units cannot be greater than number of image units */
+   assert(ctx->Const.MaxTextureCoordUnits <= ctx->Const.MaxTextureImageUnits);
+
+
+   /* Texture size checks */
+   assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
+   assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
+   assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
+   assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
+
+   /* make sure largest texture image is <= MAX_WIDTH in size */
+   assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= MAX_WIDTH);
+   assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= MAX_WIDTH);
+   assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= MAX_WIDTH);
+
+   /* Texture level checks */
+   assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
+   assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
+
+   /* Max texture size should be <= max viewport size (render to texture) */
+   assert((1 << (MAX_TEXTURE_LEVELS - 1)) <= MAX_WIDTH);
+
+   assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
+   assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
+
+   assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
+
+   /* if this fails, add more enum values to gl_buffer_index */
+   assert(BUFFER_COLOR0 + MAX_DRAW_BUFFERS <= BUFFER_COUNT);
+
+   /* XXX probably add more tests */
+}
+
+
+/**
+ * Initialize the attribute groups in a GL context.
+ *
+ * \param ctx GL context.
+ *
+ * Initializes all the attributes, calling the respective <tt>init*</tt>
+ * functions for the more complex data structures.
+ */
+static GLboolean
+init_attrib_groups(struct gl_context *ctx)
+{
+   assert(ctx);
+
+   /* Constants */
+   _mesa_init_constants( ctx );
+
+   /* Extensions */
+   _mesa_init_extensions( ctx );
+
+   /* Attribute Groups */
+   _mesa_init_accum( ctx );
+   _mesa_init_attrib( ctx );
+   _mesa_init_buffer_objects( ctx );
+   _mesa_init_color( ctx );
+   _mesa_init_current( ctx );
+   _mesa_init_depth( ctx );
+   _mesa_init_debug( ctx );
+   _mesa_init_display_list( ctx );
+   _mesa_init_eval( ctx );
+   _mesa_init_fbobjects( ctx );
+   _mesa_init_feedback( ctx );
+   _mesa_init_fog( ctx );
+   _mesa_init_hint( ctx );
+   _mesa_init_line( ctx );
+   _mesa_init_lighting( ctx );
+   _mesa_init_matrix( ctx );
+   _mesa_init_multisample( ctx );
+   _mesa_init_pixel( ctx );
+   _mesa_init_pixelstore( ctx );
+   _mesa_init_point( ctx );
+   _mesa_init_polygon( ctx );
+   _mesa_init_program( ctx );
+   _mesa_init_queryobj( ctx );
+   _mesa_init_sync( ctx );
+   _mesa_init_rastpos( ctx );
+   _mesa_init_scissor( ctx );
+   _mesa_init_shader_state( ctx );
+   _mesa_init_stencil( ctx );
+   _mesa_init_transform( ctx );
+   _mesa_init_transform_feedback( ctx );
+   _mesa_init_varray( ctx );
+   _mesa_init_viewport( ctx );
+
+   if (!_mesa_init_texture( ctx ))
+      return GL_FALSE;
+
+   _mesa_init_texture_s3tc( ctx );
+
+   /* Miscellaneous */
+   ctx->NewState = _NEW_ALL;
+   ctx->ErrorValue = (GLenum) GL_NO_ERROR;
+   ctx->varying_vp_inputs = ~0;
+
+   return GL_TRUE;
+}
+
+
+/**
+ * Update default objects in a GL context with respect to shared state.
+ *
+ * \param ctx GL context.
+ *
+ * Removes references to old default objects, (texture objects, program
+ * objects, etc.) and changes to reference those from the current shared
+ * state.
+ */
+static GLboolean
+update_default_objects(struct gl_context *ctx)
+{
+   assert(ctx);
+
+   _mesa_update_default_objects_program(ctx);
+   _mesa_update_default_objects_texture(ctx);
+   _mesa_update_default_objects_buffer_objects(ctx);
+
+   return GL_TRUE;
+}
+
+
+/**
+ * This is the default function we plug into all dispatch table slots
+ * This helps prevents a segfault when someone calls a GL function without
+ * first checking if the extension's supported.
+ */
+static int
+generic_nop(void)
+{
+   _mesa_warning(NULL, "User called no-op dispatch function (an unsupported extension function?)");
+   return 0;
+}
+
+
+/**
+ * Allocate and initialize a new dispatch table.
+ */
+struct _glapi_table *
+_mesa_alloc_dispatch_table(int size)
+{
+   /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
+    * In practice, this'll be the same for stand-alone Mesa.  But for DRI
+    * Mesa we do this to accomodate different versions of libGL and various
+    * DRI drivers.
+    */
+   GLint numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);
+   struct _glapi_table *table;
+
+   /* should never happen, but just in case */
+   numEntries = MAX2(numEntries, size);
+
+   table = (struct _glapi_table *) malloc(numEntries * sizeof(_glapi_proc));
+   if (table) {
+      _glapi_proc *entry = (_glapi_proc *) table;
+      GLint i;
+      for (i = 0; i < numEntries; i++) {
+         entry[i] = (_glapi_proc) generic_nop;
+      }
+   }
+   return table;
+}
+
+
+/**
+ * Initialize a struct gl_context struct (rendering context).
+ *
+ * This includes allocating all the other structs and arrays which hang off of
+ * the context by pointers.
+ * Note that the driver needs to pass in its dd_function_table here since
+ * we need to at least call driverFunctions->NewTextureObject to create the
+ * default texture objects.
+ * 
+ * Called by _mesa_create_context().
+ *
+ * Performs the imports and exports callback tables initialization, and
+ * miscellaneous one-time initializations. If no shared context is supplied one
+ * is allocated, and increase its reference count.  Setups the GL API dispatch
+ * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
+ * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
+ * for debug flags.
+ *
+ * \param ctx the context to initialize
+ * \param api the GL API type to create the context for
+ * \param visual describes the visual attributes for this context
+ * \param share_list points to context to share textures, display lists,
+ *        etc with, or NULL
+ * \param driverFunctions table of device driver functions for this context
+ *        to use
+ * \param driverContext pointer to driver-specific context data
+ */
+GLboolean
+_mesa_initialize_context_for_api(struct gl_context *ctx,
+				 gl_api api,
+				 const struct gl_config *visual,
+				 struct gl_context *share_list,
+				 const struct dd_function_table *driverFunctions,
+				 void *driverContext)
+{
+   struct gl_shared_state *shared;
+   int i;
+
+   /*ASSERT(driverContext);*/
+   assert(driverFunctions->NewTextureObject);
+   assert(driverFunctions->FreeTexImageData);
+
+   ctx->API = api;
+   ctx->Visual = *visual;
+   ctx->DrawBuffer = NULL;
+   ctx->ReadBuffer = NULL;
+   ctx->WinSysDrawBuffer = NULL;
+   ctx->WinSysReadBuffer = NULL;
+
+   /* misc one-time initializations */
+   one_time_init(ctx);
+
+   /* Plug in driver functions and context pointer here.
+    * This is important because when we call alloc_shared_state() below
+    * we'll call ctx->Driver.NewTextureObject() to create the default
+    * textures.
+    */
+   ctx->Driver = *driverFunctions;
+   ctx->DriverCtx = driverContext;
+
+   if (share_list) {
+      /* share state with another context */
+      shared = share_list->Shared;
+   }
+   else {
+      /* allocate new, unshared state */
+      shared = _mesa_alloc_shared_state(ctx);
+      if (!shared)
+         return GL_FALSE;
+   }
+
+   _glthread_LOCK_MUTEX(shared->Mutex);
+   ctx->Shared = shared;
+   shared->RefCount++;
+   _glthread_UNLOCK_MUTEX(shared->Mutex);
+
+   if (!init_attrib_groups( ctx )) {
+      _mesa_release_shared_state(ctx, ctx->Shared);
+      return GL_FALSE;
+   }
+
+#if FEATURE_dispatch
+   /* setup the API dispatch tables */
+   switch (ctx->API) {
+#if FEATURE_GL
+   case API_OPENGL:
+      ctx->Exec = _mesa_create_exec_table();
+      break;
+#endif
+#if FEATURE_ES1
+   case API_OPENGLES:
+      ctx->Exec = _mesa_create_exec_table_es1();
+      break;
+#endif
+#if FEATURE_ES2
+   case API_OPENGLES2:
+      ctx->Exec = _mesa_create_exec_table_es2();
+      break;
+#endif
+   default:
+      _mesa_problem(ctx, "unknown or unsupported API");
+      break;
+   }
+
+   if (!ctx->Exec) {
+      _mesa_release_shared_state(ctx, ctx->Shared);
+      return GL_FALSE;
+   }
+#endif
+   ctx->CurrentDispatch = ctx->Exec;
+
+   ctx->FragmentProgram._MaintainTexEnvProgram
+      = (_mesa_getenv("MESA_TEX_PROG") != NULL);
+
+   ctx->VertexProgram._MaintainTnlProgram
+      = (_mesa_getenv("MESA_TNL_PROG") != NULL);
+   if (ctx->VertexProgram._MaintainTnlProgram) {
+      /* this is required... */
+      ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
+   }
+
+   /* Mesa core handles all the formats that mesa core knows about.
+    * Drivers will want to override this list with just the formats
+    * they can handle, and confirm that appropriate fallbacks exist in
+    * _mesa_choose_tex_format().
+    */
+   memset(&ctx->TextureFormatSupported, GL_TRUE,
+	  sizeof(ctx->TextureFormatSupported));
+
+   switch (ctx->API) {
+   case API_OPENGL:
+#if FEATURE_dlist
+      ctx->Save = _mesa_create_save_table();
+      if (!ctx->Save) {
+	 _mesa_release_shared_state(ctx, ctx->Shared);
+	 free(ctx->Exec);
+	 return GL_FALSE;
+      }
+
+      _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
+#endif
+      break;
+   case API_OPENGLES:
+      /**
+       * GL_OES_texture_cube_map says
+       * "Initially all texture generation modes are set to REFLECTION_MAP_OES"
+       */
+      for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
+	 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
+	 texUnit->GenS.Mode = GL_REFLECTION_MAP_NV;
+	 texUnit->GenT.Mode = GL_REFLECTION_MAP_NV;
+	 texUnit->GenR.Mode = GL_REFLECTION_MAP_NV;
+	 texUnit->GenS._ModeBit = TEXGEN_REFLECTION_MAP_NV;
+	 texUnit->GenT._ModeBit = TEXGEN_REFLECTION_MAP_NV;
+	 texUnit->GenR._ModeBit = TEXGEN_REFLECTION_MAP_NV;
+      }
+      break;
+   case API_OPENGLES2:
+      ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
+      ctx->VertexProgram._MaintainTnlProgram = GL_TRUE;
+      ctx->Point.PointSprite = GL_TRUE;  /* always on for ES 2.x */
+      break;
+   }
+
+   ctx->FirstTimeCurrent = GL_TRUE;
+
+   return GL_TRUE;
+}
+
+
+/**
+ * Initialize an OpenGL context.
+ */
+GLboolean
+_mesa_initialize_context(struct gl_context *ctx,
+                         const struct gl_config *visual,
+                         struct gl_context *share_list,
+                         const struct dd_function_table *driverFunctions,
+                         void *driverContext)
+{
+   return _mesa_initialize_context_for_api(ctx,
+					   API_OPENGL,
+					   visual,
+					   share_list,
+					   driverFunctions,
+					   driverContext);
+}
+
+
+/**
+ * Allocate and initialize a struct gl_context structure.
+ * Note that the driver needs to pass in its dd_function_table here since
+ * we need to at least call driverFunctions->NewTextureObject to initialize
+ * the rendering context.
+ *
+ * \param api the GL API type to create the context for
+ * \param visual a struct gl_config pointer (we copy the struct contents)
+ * \param share_list another context to share display lists with or NULL
+ * \param driverFunctions points to the dd_function_table into which the
+ *        driver has plugged in all its special functions.
+ * \param driverContext points to the device driver's private context state
+ * 
+ * \return pointer to a new __struct gl_contextRec or NULL if error.
+ */
+struct gl_context *
+_mesa_create_context_for_api(gl_api api,
+			     const struct gl_config *visual,
+			     struct gl_context *share_list,
+			     const struct dd_function_table *driverFunctions,
+			     void *driverContext)
+{
+   struct gl_context *ctx;
+
+   ASSERT(visual);
+   /*ASSERT(driverContext);*/
+
+   ctx = (struct gl_context *) calloc(1, sizeof(struct gl_context));
+   if (!ctx)
+      return NULL;
+
+   if (_mesa_initialize_context_for_api(ctx, api, visual, share_list,
+					driverFunctions, driverContext)) {
+      return ctx;
+   }
+   else {
+      free(ctx);
+      return NULL;
+   }
+}
+
+
+/**
+ * Create an OpenGL context.
+ */
+struct gl_context *
+_mesa_create_context(const struct gl_config *visual,
+		     struct gl_context *share_list,
+		     const struct dd_function_table *driverFunctions,
+		     void *driverContext)
+{
+   return _mesa_create_context_for_api(API_OPENGL, visual,
+				       share_list,
+				       driverFunctions,
+				       driverContext);
+}
+
+
+/**
+ * Free the data associated with the given context.
+ * 
+ * But doesn't free the struct gl_context struct itself.
+ *
+ * \sa _mesa_initialize_context() and init_attrib_groups().
+ */
+void
+_mesa_free_context_data( struct gl_context *ctx )
+{
+   if (!_mesa_get_current_context()){
+      /* No current context, but we may need one in order to delete
+       * texture objs, etc.  So temporarily bind the context now.
+       */
+      _mesa_make_current(ctx, NULL, NULL);
+   }
+
+   /* unreference WinSysDraw/Read buffers */
+   _mesa_reference_framebuffer(&ctx->WinSysDrawBuffer, NULL);
+   _mesa_reference_framebuffer(&ctx->WinSysReadBuffer, NULL);
+   _mesa_reference_framebuffer(&ctx->DrawBuffer, NULL);
+   _mesa_reference_framebuffer(&ctx->ReadBuffer, NULL);
+
+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
+
+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
+
+   _mesa_free_attrib_data(ctx);
+   _mesa_free_buffer_objects(ctx);
+   _mesa_free_lighting_data( ctx );
+   _mesa_free_eval_data( ctx );
+   _mesa_free_texture_data( ctx );
+   _mesa_free_matrix_data( ctx );
+   _mesa_free_viewport_data( ctx );
+   _mesa_free_program_data(ctx);
+   _mesa_free_shader_state(ctx);
+   _mesa_free_queryobj_data(ctx);
+   _mesa_free_sync_data(ctx);
+   _mesa_free_varray_data(ctx);
+   _mesa_free_transform_feedback(ctx);
+
+   _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
+
+#if FEATURE_ARB_pixel_buffer_object
+   _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
+   _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
+   _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj, NULL);
+#endif
+
+#if FEATURE_ARB_vertex_buffer_object
+   _mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
+   _mesa_reference_buffer_object(ctx, &ctx->Array.ElementArrayBufferObj, NULL);
+#endif
+
+   /* free dispatch tables */
+   free(ctx->Exec);
+   free(ctx->Save);
+
+   /* Shared context state (display lists, textures, etc) */
+   _mesa_release_shared_state( ctx, ctx->Shared );
+
+   /* needs to be after freeing shared state */
+   _mesa_free_display_list_data(ctx);
+
+   if (ctx->Extensions.String)
+      free((void *) ctx->Extensions.String);
+
+   if (ctx->VersionString)
+      free(ctx->VersionString);
+
+   /* unbind the context if it's currently bound */
+   if (ctx == _mesa_get_current_context()) {
+      _mesa_make_current(NULL, NULL, NULL);
+   }
+}
+
+
+/**
+ * Destroy a struct gl_context structure.
+ *
+ * \param ctx GL context.
+ * 
+ * Calls _mesa_free_context_data() and frees the gl_context object itself.
+ */
+void
+_mesa_destroy_context( struct gl_context *ctx )
+{
+   if (ctx) {
+      _mesa_free_context_data(ctx);
+      free( (void *) ctx );
+   }
+}
+
+
+#if _HAVE_FULL_GL
+/**
+ * Copy attribute groups from one context to another.
+ * 
+ * \param src source context
+ * \param dst destination context
+ * \param mask bitwise OR of GL_*_BIT flags
+ *
+ * According to the bits specified in \p mask, copies the corresponding
+ * attributes from \p src into \p dst.  For many of the attributes a simple \c
+ * memcpy is not enough due to the existence of internal pointers in their data
+ * structures.
+ */
+void
+_mesa_copy_context( const struct gl_context *src, struct gl_context *dst, GLuint mask )
+{
+   if (mask & GL_ACCUM_BUFFER_BIT) {
+      /* OK to memcpy */
+      dst->Accum = src->Accum;
+   }
+   if (mask & GL_COLOR_BUFFER_BIT) {
+      /* OK to memcpy */
+      dst->Color = src->Color;
+   }
+   if (mask & GL_CURRENT_BIT) {
+      /* OK to memcpy */
+      dst->Current = src->Current;
+   }
+   if (mask & GL_DEPTH_BUFFER_BIT) {
+      /* OK to memcpy */
+      dst->Depth = src->Depth;
+   }
+   if (mask & GL_ENABLE_BIT) {
+      /* no op */
+   }
+   if (mask & GL_EVAL_BIT) {
+      /* OK to memcpy */
+      dst->Eval = src->Eval;
+   }
+   if (mask & GL_FOG_BIT) {
+      /* OK to memcpy */
+      dst->Fog = src->Fog;
+   }
+   if (mask & GL_HINT_BIT) {
+      /* OK to memcpy */
+      dst->Hint = src->Hint;
+   }
+   if (mask & GL_LIGHTING_BIT) {
+      GLuint i;
+      /* begin with memcpy */
+      dst->Light = src->Light;
+      /* fixup linked lists to prevent pointer insanity */
+      make_empty_list( &(dst->Light.EnabledList) );
+      for (i = 0; i < MAX_LIGHTS; i++) {
+         if (dst->Light.Light[i].Enabled) {
+            insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
+         }
+      }
+   }
+   if (mask & GL_LINE_BIT) {
+      /* OK to memcpy */
+      dst->Line = src->Line;
+   }
+   if (mask & GL_LIST_BIT) {
+      /* OK to memcpy */
+      dst->List = src->List;
+   }
+   if (mask & GL_PIXEL_MODE_BIT) {
+      /* OK to memcpy */
+      dst->Pixel = src->Pixel;
+   }
+   if (mask & GL_POINT_BIT) {
+      /* OK to memcpy */
+      dst->Point = src->Point;
+   }
+   if (mask & GL_POLYGON_BIT) {
+      /* OK to memcpy */
+      dst->Polygon = src->Polygon;
+   }
+   if (mask & GL_POLYGON_STIPPLE_BIT) {
+      /* Use loop instead of memcpy due to problem with Portland Group's
+       * C compiler.  Reported by John Stone.
+       */
+      GLuint i;
+      for (i = 0; i < 32; i++) {
+         dst->PolygonStipple[i] = src->PolygonStipple[i];
+      }
+   }
+   if (mask & GL_SCISSOR_BIT) {
+      /* OK to memcpy */
+      dst->Scissor = src->Scissor;
+   }
+   if (mask & GL_STENCIL_BUFFER_BIT) {
+      /* OK to memcpy */
+      dst->Stencil = src->Stencil;
+   }
+   if (mask & GL_TEXTURE_BIT) {
+      /* Cannot memcpy because of pointers */
+      _mesa_copy_texture_state(src, dst);
+   }
+   if (mask & GL_TRANSFORM_BIT) {
+      /* OK to memcpy */
+      dst->Transform = src->Transform;
+   }
+   if (mask & GL_VIEWPORT_BIT) {
+      /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
+      dst->Viewport.X = src->Viewport.X;
+      dst->Viewport.Y = src->Viewport.Y;
+      dst->Viewport.Width = src->Viewport.Width;
+      dst->Viewport.Height = src->Viewport.Height;
+      dst->Viewport.Near = src->Viewport.Near;
+      dst->Viewport.Far = src->Viewport.Far;
+      _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
+   }
+
+   /* XXX FIXME:  Call callbacks?
+    */
+   dst->NewState = _NEW_ALL;
+}
+#endif
+
+
+/**
+ * Check if the given context can render into the given framebuffer
+ * by checking visual attributes.
+ *
+ * Most of these tests could go away because Mesa is now pretty flexible
+ * in terms of mixing rendering contexts with framebuffers.  As long
+ * as RGB vs. CI mode agree, we're probably good.
+ *
+ * \return GL_TRUE if compatible, GL_FALSE otherwise.
+ */
+static GLboolean 
+check_compatible(const struct gl_context *ctx,
+                 const struct gl_framebuffer *buffer)
+{
+   const struct gl_config *ctxvis = &ctx->Visual;
+   const struct gl_config *bufvis = &buffer->Visual;
+
+   if (buffer == _mesa_get_incomplete_framebuffer())
+      return GL_TRUE;
+
+#if 0
+   /* disabling this fixes the fgl_glxgears pbuffer demo */
+   if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
+      return GL_FALSE;
+#endif
+   if (ctxvis->stereoMode && !bufvis->stereoMode)
+      return GL_FALSE;
+   if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
+      return GL_FALSE;
+   if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
+      return GL_FALSE;
+   if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
+      return GL_FALSE;
+   if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
+      return GL_FALSE;
+   if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
+      return GL_FALSE;
+   if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
+      return GL_FALSE;
+#if 0
+   /* disabled (see bug 11161) */
+   if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
+      return GL_FALSE;
+#endif
+   if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
+      return GL_FALSE;
+
+   return GL_TRUE;
+}
+
+
+/**
+ * Do one-time initialization for the given framebuffer.  Specifically,
+ * ask the driver for the window's current size and update the framebuffer
+ * object to match.
+ * Really, the device driver should totally take care of this.
+ */
+static void
+initialize_framebuffer_size(struct gl_context *ctx, struct gl_framebuffer *fb)
+{
+   GLuint width, height;
+   if (ctx->Driver.GetBufferSize) {
+      ctx->Driver.GetBufferSize(fb, &width, &height);
+      if (ctx->Driver.ResizeBuffers)
+         ctx->Driver.ResizeBuffers(ctx, fb, width, height);
+      fb->Initialized = GL_TRUE;
+   }
+}
+
+
+/**
+ * Check if the viewport/scissor size has not yet been initialized.
+ * Initialize the size if the given width and height are non-zero.
+ */
+void
+_mesa_check_init_viewport(struct gl_context *ctx, GLuint width, GLuint height)
+{
+   if (!ctx->ViewportInitialized && width > 0 && height > 0) {
+      /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
+       * potential infinite recursion.
+       */
+      ctx->ViewportInitialized = GL_TRUE;
+      _mesa_set_viewport(ctx, 0, 0, width, height);
+      _mesa_set_scissor(ctx, 0, 0, width, height);
+   }
+}
+
+
+/**
+ * Bind the given context to the given drawBuffer and readBuffer and
+ * make it the current context for the calling thread.
+ * We'll render into the drawBuffer and read pixels from the
+ * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
+ *
+ * We check that the context's and framebuffer's visuals are compatible
+ * and return immediately if they're not.
+ *
+ * \param newCtx  the new GL context. If NULL then there will be no current GL
+ *                context.
+ * \param drawBuffer  the drawing framebuffer
+ * \param readBuffer  the reading framebuffer
+ */
+GLboolean
+_mesa_make_current( struct gl_context *newCtx,
+                    struct gl_framebuffer *drawBuffer,
+                    struct gl_framebuffer *readBuffer )
+{
+   GET_CURRENT_CONTEXT(curCtx);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(newCtx, "_mesa_make_current()\n");
+
+   /* Check that the context's and framebuffer's visuals are compatible.
+    */
+   if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
+      if (!check_compatible(newCtx, drawBuffer)) {
+         _mesa_warning(newCtx,
+              "MakeCurrent: incompatible visuals for context and drawbuffer");
+         return GL_FALSE;
+      }
+   }
+   if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
+      if (!check_compatible(newCtx, readBuffer)) {
+         _mesa_warning(newCtx,
+              "MakeCurrent: incompatible visuals for context and readbuffer");
+         return GL_FALSE;
+      }
+   }
+
+   if (curCtx && 
+      (curCtx->WinSysDrawBuffer || curCtx->WinSysReadBuffer) && /* make sure this context is valid for flushing */
+      curCtx != newCtx)
+      _mesa_flush(curCtx);
+
+   /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
+   _glapi_set_context((void *) newCtx);
+   ASSERT(_mesa_get_current_context() == newCtx);
+
+   if (!newCtx) {
+      _glapi_set_dispatch(NULL);  /* none current */
+   }
+   else {
+      _glapi_set_dispatch(newCtx->CurrentDispatch);
+
+      if (drawBuffer && readBuffer) {
+	 /* TODO: check if newCtx and buffer's visual match??? */
+
+         ASSERT(drawBuffer->Name == 0);
+         ASSERT(readBuffer->Name == 0);
+         _mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
+         _mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
+
+         /*
+          * Only set the context's Draw/ReadBuffer fields if they're NULL
+          * or not bound to a user-created FBO.
+          */
+         if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
+            /* KW: merge conflict here, revisit. 
+             */
+            /* fix up the fb fields - these will end up wrong otherwise
+             * if the DRIdrawable changes, and everything relies on them.
+             * This is a bit messy (same as needed in _mesa_BindFramebufferEXT)
+             */
+            unsigned int i;
+            GLenum buffers[MAX_DRAW_BUFFERS];
+
+            _mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
+
+            for(i = 0; i < newCtx->Const.MaxDrawBuffers; i++) {
+               buffers[i] = newCtx->Color.DrawBuffer[i];
+            }
+
+            _mesa_drawbuffers(newCtx, newCtx->Const.MaxDrawBuffers,
+                              buffers, NULL);
+         }
+         if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
+            _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
+         }
+
+         /* XXX only set this flag if we're really changing the draw/read
+          * framebuffer bindings.
+          */
+	 newCtx->NewState |= _NEW_BUFFERS;
+
+#if 1
+         /* We want to get rid of these lines: */
+
+#if _HAVE_FULL_GL
+         if (!drawBuffer->Initialized) {
+            initialize_framebuffer_size(newCtx, drawBuffer);
+         }
+         if (readBuffer != drawBuffer && !readBuffer->Initialized) {
+            initialize_framebuffer_size(newCtx, readBuffer);
+         }
+
+	 _mesa_resizebuffers(newCtx);
+#endif
+
+#else
+         /* We want the drawBuffer and readBuffer to be initialized by
+          * the driver.
+          * This generally means the Width and Height match the actual
+          * window size and the renderbuffers (both hardware and software
+          * based) are allocated to match.  The later can generally be
+          * done with a call to _mesa_resize_framebuffer().
+          *
+          * It's theoretically possible for a buffer to have zero width
+          * or height, but for now, assert check that the driver did what's
+          * expected of it.
+          */
+         ASSERT(drawBuffer->Width > 0);
+         ASSERT(drawBuffer->Height > 0);
+#endif
+
+         if (drawBuffer) {
+            _mesa_check_init_viewport(newCtx,
+                                      drawBuffer->Width, drawBuffer->Height);
+         }
+      }
+
+      if (newCtx->FirstTimeCurrent) {
+         _mesa_compute_version(newCtx);
+
+         newCtx->Extensions.String = _mesa_make_extension_string(newCtx);
+
+         check_context_limits(newCtx);
+
+         /* We can use this to help debug user's problems.  Tell them to set
+          * the MESA_INFO env variable before running their app.  Then the
+          * first time each context is made current we'll print some useful
+          * information.
+          */
+	 if (_mesa_getenv("MESA_INFO")) {
+	    _mesa_print_info();
+	 }
+
+	 newCtx->FirstTimeCurrent = GL_FALSE;
+      }
+   }
+   
+   return GL_TRUE;
+}
+
+
+/**
+ * Make context 'ctx' share the display lists, textures and programs
+ * that are associated with 'ctxToShare'.
+ * Any display lists, textures or programs associated with 'ctx' will
+ * be deleted if nobody else is sharing them.
+ */
+GLboolean
+_mesa_share_state(struct gl_context *ctx, struct gl_context *ctxToShare)
+{
+   if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
+      struct gl_shared_state *oldSharedState = ctx->Shared;
+
+      ctx->Shared = ctxToShare->Shared;
+      
+      _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
+      ctx->Shared->RefCount++;
+      _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
+
+      update_default_objects(ctx);
+
+      _mesa_release_shared_state(ctx, oldSharedState);
+
+      return GL_TRUE;
+   }
+   else {
+      return GL_FALSE;
+   }
+}
+
+
+
+/**
+ * \return pointer to the current GL context for this thread.
+ * 
+ * Calls _glapi_get_context(). This isn't the fastest way to get the current
+ * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in
+ * context.h.
+ */
+struct gl_context *
+_mesa_get_current_context( void )
+{
+   return (struct gl_context *) _glapi_get_context();
+}
+
+
+/**
+ * Get context's current API dispatch table.
+ *
+ * It'll either be the immediate-mode execute dispatcher or the display list
+ * compile dispatcher.
+ * 
+ * \param ctx GL context.
+ *
+ * \return pointer to dispatch_table.
+ *
+ * Simply returns __struct gl_contextRec::CurrentDispatch.
+ */
+struct _glapi_table *
+_mesa_get_dispatch(struct gl_context *ctx)
+{
+   return ctx->CurrentDispatch;
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Miscellaneous functions                                     */
+/**********************************************************************/
+/*@{*/
+
+/**
+ * Record an error.
+ *
+ * \param ctx GL context.
+ * \param error error code.
+ * 
+ * Records the given error code and call the driver's dd_function_table::Error
+ * function if defined.
+ *
+ * \sa
+ * This is called via _mesa_error().
+ */
+void
+_mesa_record_error(struct gl_context *ctx, GLenum error)
+{
+   if (!ctx)
+      return;
+
+   if (ctx->ErrorValue == GL_NO_ERROR) {
+      ctx->ErrorValue = error;
+   }
+
+   /* Call device driver's error handler, if any.  This is used on the Mac. */
+   if (ctx->Driver.Error) {
+      ctx->Driver.Error(ctx);
+   }
+}
+
+
+/**
+ * Flush commands and wait for completion.
+ */
+void
+_mesa_finish(struct gl_context *ctx)
+{
+   FLUSH_CURRENT( ctx, 0 );
+   if (ctx->Driver.Finish) {
+      ctx->Driver.Finish(ctx);
+   }
+}
+
+
+/**
+ * Flush commands.
+ */
+void
+_mesa_flush(struct gl_context *ctx)
+{
+   FLUSH_CURRENT( ctx, 0 );
+   if (ctx->Driver.Flush) {
+      ctx->Driver.Flush(ctx);
+   }
+}
+
+
+
+/**
+ * Execute glFinish().
+ *
+ * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
+ * dd_function_table::Finish driver callback, if not NULL.
+ */
+void GLAPIENTRY
+_mesa_Finish(void)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+   _mesa_finish(ctx);
+}
+
+
+/**
+ * Execute glFlush().
+ *
+ * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
+ * dd_function_table::Flush driver callback, if not NULL.
+ */
+void GLAPIENTRY
+_mesa_Flush(void)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+   _mesa_flush(ctx);
+}
+
+
+/**
+ * Set mvp_with_dp4 flag.  If a driver has a preference for DP4 over
+ * MUL/MAD, or vice versa, call this function to register that.
+ * Otherwise we default to MUL/MAD.
+ */
+void
+_mesa_set_mvp_with_dp4( struct gl_context *ctx,
+                        GLboolean flag )
+{
+   ctx->mvp_with_dp4 = flag;
+}
+
+
+
+/**
+ * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
+ * is called to see if it's valid to render.  This involves checking that
+ * the current shader is valid and the framebuffer is complete.
+ * If an error is detected it'll be recorded here.
+ * \return GL_TRUE if OK to render, GL_FALSE if not
+ */
+GLboolean
+_mesa_valid_to_render(struct gl_context *ctx, const char *where)
+{
+   bool vert_from_glsl_shader = false;
+   bool geom_from_glsl_shader = false;
+   bool frag_from_glsl_shader = false;
+
+   /* This depends on having up to date derived state (shaders) */
+   if (ctx->NewState)
+      _mesa_update_state(ctx);
+
+   if (ctx->Shader.CurrentVertexProgram) {
+      vert_from_glsl_shader = true;
+
+      if (!ctx->Shader.CurrentVertexProgram->LinkStatus) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "%s(shader not linked)", where);
+         return GL_FALSE;
+      }
+#if 0 /* not normally enabled */
+      {
+         char errMsg[100];
+         if (!_mesa_validate_shader_program(ctx,
+					    ctx->Shader.CurrentVertexProgram,
+                                            errMsg)) {
+            _mesa_warning(ctx, "Shader program %u is invalid: %s",
+                          ctx->Shader.CurrentVertexProgram->Name, errMsg);
+         }
+      }
+#endif
+   }
+
+   if (ctx->Shader.CurrentGeometryProgram) {
+      geom_from_glsl_shader = true;
+
+      if (!ctx->Shader.CurrentGeometryProgram->LinkStatus) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "%s(shader not linked)", where);
+         return GL_FALSE;
+      }
+#if 0 /* not normally enabled */
+      {
+         char errMsg[100];
+         if (!_mesa_validate_shader_program(ctx,
+					    ctx->Shader.CurrentGeometryProgram,
+                                            errMsg)) {
+            _mesa_warning(ctx, "Shader program %u is invalid: %s",
+                          ctx->Shader.CurrentGeometryProgram->Name, errMsg);
+         }
+      }
+#endif
+   }
+
+   if (ctx->Shader.CurrentFragmentProgram) {
+      frag_from_glsl_shader = true;
+
+      if (!ctx->Shader.CurrentFragmentProgram->LinkStatus) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "%s(shader not linked)", where);
+         return GL_FALSE;
+      }
+#if 0 /* not normally enabled */
+      {
+         char errMsg[100];
+         if (!_mesa_validate_shader_program(ctx,
+					    ctx->Shader.CurrentFragmentProgram,
+                                            errMsg)) {
+            _mesa_warning(ctx, "Shader program %u is invalid: %s",
+                          ctx->Shader.CurrentFragmentProgram->Name, errMsg);
+         }
+      }
+#endif
+   }
+
+   /* Any shader stages that are not supplied by the GLSL shader and have
+    * assembly shaders enabled must now be validated.
+    */
+   if (!vert_from_glsl_shader
+       && ctx->VertexProgram.Enabled && !ctx->VertexProgram._Enabled) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+		  "%s(vertex program not valid)", where);
+      return GL_FALSE;
+   }
+
+   /* FINISHME: If GL_NV_geometry_program4 is ever supported, the current
+    * FINISHME: geometry program should validated here.
+    */
+   (void) geom_from_glsl_shader;
+
+   if (!frag_from_glsl_shader) {
+      if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
+	 _mesa_error(ctx, GL_INVALID_OPERATION,
+		     "%s(fragment program not valid)", where);
+	 return GL_FALSE;
+      }
+
+      /* If drawing to integer-valued color buffers, there must be an
+       * active fragment shader (GL_EXT_texture_integer).
+       */
+      if (ctx->DrawBuffer && ctx->DrawBuffer->_IntegerColor) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "%s(integer format but no fragment shader)", where);
+         return GL_FALSE;
+      }
+   }
+
+   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
+                  "%s(incomplete framebuffer)", where);
+      return GL_FALSE;
+   }
+
+#ifdef DEBUG
+   if (ctx->Shader.Flags & GLSL_LOG) {
+      struct gl_shader_program *shProg[MESA_SHADER_TYPES];
+      gl_shader_type i;
+
+      shProg[MESA_SHADER_VERTEX] = ctx->Shader.CurrentVertexProgram;
+      shProg[MESA_SHADER_GEOMETRY] = ctx->Shader.CurrentGeometryProgram;
+      shProg[MESA_SHADER_FRAGMENT] = ctx->Shader.CurrentFragmentProgram;
+
+      for (i = 0; i < MESA_SHADER_TYPES; i++) {
+	 struct gl_shader *sh;
+
+	 if (shProg[i] == NULL || shProg[i]->_Used
+	     || shProg[i]->_LinkedShaders[i] == NULL)
+	    continue;
+
+	 /* This is the first time this shader is being used.
+	  * Append shader's constants/uniforms to log file.
+	  *
+	  * The logic is a little odd here.  We only want to log data for each
+	  * shader target that will actually be used, and we only want to log
+	  * it once.  It's possible to have a program bound to the vertex
+	  * shader target that also supplied a fragment shader.  If that
+	  * program isn't also bound to the fragment shader target we don't
+	  * want to log its fragment data.
+	  */
+	 sh = shProg[i]->_LinkedShaders[i];
+	 switch (sh->Type) {
+	 case GL_VERTEX_SHADER:
+	    _mesa_append_uniforms_to_file(sh, &shProg[i]->VertexProgram->Base);
+	    break;
+
+	 case GL_GEOMETRY_SHADER_ARB:
+	    _mesa_append_uniforms_to_file(sh,
+					  &shProg[i]->GeometryProgram->Base);
+	    break;
+
+	 case GL_FRAGMENT_SHADER:
+	    _mesa_append_uniforms_to_file(sh,
+					  &shProg[i]->FragmentProgram->Base);
+	    break;
+	 }
+      }
+
+      for (i = 0; i < MESA_SHADER_TYPES; i++) {
+	 if (shProg[i] != NULL)
+	    shProg[i]->_Used = GL_TRUE;
+      }
+   }
+#endif
+
+   return GL_TRUE;
+}
+
+
+/*@}*/