xserver libX11 Xextproto mesa Git update 28 Feb 2011

1 files changed, 498 insertions, 482 deletions

diff --git a/mesalib/src/mesa/state_tracker/st_extensions.c b/mesalib/src/mesa/state_tracker/st_extensions.c
index b1ede1c8b..d2098987d 100644
--- a/mesalib/src/mesa/state_tracker/st_extensions.c
+++ b/mesalib/src/mesa/state_tracker/st_extensions.c
@@ -1,482 +1,498 @@
-/**************************************************************************

- * 

- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

- * 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, sub license, 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 (including the

- * next paragraph) 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 NON-INFRINGEMENT.

- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.

- * 

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

-

-#include "main/imports.h"

-#include "main/context.h"

-#include "main/macros.h"

-#include "main/mfeatures.h"

-

-#include "pipe/p_context.h"

-#include "pipe/p_defines.h"

-#include "pipe/p_screen.h"

-

-#include "st_context.h"

-#include "st_extensions.h"

-

-

-static int _min(int a, int b)

-{

-   return (a < b) ? a : b;

-}

-

-static float _maxf(float a, float b)

-{

-   return (a > b) ? a : b;

-}

-

-static int _clamp(int a, int min, int max)

-{

-   if (a < min)

-      return min;

-   else if (a > max)

-      return max;

-   else

-      return a;

-}

-

-

-/**

- * Query driver to get implementation limits.

- * Note that we have to limit/clamp against Mesa's internal limits too.

- */

-void st_init_limits(struct st_context *st)

-{

-   struct pipe_screen *screen = st->pipe->screen;

-   struct gl_constants *c = &st->ctx->Const;

-   gl_shader_type sh;

-

-   c->MaxTextureLevels

-      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),

-            MAX_TEXTURE_LEVELS);

-

-   c->Max3DTextureLevels

-      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),

-            MAX_3D_TEXTURE_LEVELS);

-

-   c->MaxCubeTextureLevels

-      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),

-            MAX_CUBE_TEXTURE_LEVELS);

-

-   c->MaxTextureRectSize

-      = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);

-

-   c->MaxTextureImageUnits

-      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS),

-            MAX_TEXTURE_IMAGE_UNITS);

-

-   c->MaxVertexTextureImageUnits

-      = _min(screen->get_param(screen, PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS),

-             MAX_VERTEX_TEXTURE_IMAGE_UNITS);

-

-   c->MaxCombinedTextureImageUnits

-      = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),

-             MAX_COMBINED_TEXTURE_IMAGE_UNITS);

-

-   c->MaxTextureCoordUnits

-      = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);

-

-   c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);

-

-   c->MaxDrawBuffers

-      = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),

-              1, MAX_DRAW_BUFFERS);

-

-   c->MaxLineWidth

-      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH));

-   c->MaxLineWidthAA

-      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));

-

-   c->MaxPointSize

-      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));

-   c->MaxPointSizeAA

-      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));

-   /* called after _mesa_create_context/_mesa_init_point, fix default user

-    * settable max point size up

-    */

-   st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);

-   /* these are not queryable. Note that GL basically mandates a 1.0 minimum

-    * for non-aa sizes, but we can go down to 0.0 for aa points.

-    */

-   c->MinPointSize = 1.0f;

-   c->MinPointSizeAA = 0.0f;

-

-   c->MaxTextureMaxAnisotropy

-      = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));

-

-   c->MaxTextureLodBias

-      = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);

-

-   c->MaxDrawBuffers

-      = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),

-              1, MAX_DRAW_BUFFERS);

-

-   /* Quads always follow GL provoking rules. */

-   c->QuadsFollowProvokingVertexConvention = GL_FALSE;

-

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

-      struct gl_shader_compiler_options *options =

-         &st->ctx->ShaderCompilerOptions[sh];

-      struct gl_program_constants *pc;

-

-      switch (sh) {

-      case PIPE_SHADER_FRAGMENT:

-         pc = &c->FragmentProgram;

-         break;

-      case PIPE_SHADER_VERTEX:

-         pc = &c->VertexProgram;

-         break;

-      case PIPE_SHADER_GEOMETRY:

-         pc = &c->GeometryProgram;

-         break;

-      default:

-         assert(0);

-         continue;

-      }

-

-      pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);

-      pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);

-      pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);

-      pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);

-      pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);

-      pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);

-      pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);

-      pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);

-      pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);

-

-      options->EmitNoNoise = TRUE;

-

-      /* TODO: make these more fine-grained if anyone needs it */

-      options->EmitNoIfs = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);

-      options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);

-      options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);

-      options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);

-

-      options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);

-

-      options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,

-                                        PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);

-      options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,

-                                        PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);

-      options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,

-                                        PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);

-      options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,

-                                        PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);

-

-      if(options->EmitNoLoops)

-         options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);

-   }

-

-   /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs

-    * and is set in MaxNativeAttribs. It's always 2 colors + N generic

-    * attributes. The GLSL compiler never uses COLORn for varyings, so we

-    * subtract the 2 colors to get the maximum number of varyings (generic

-    * attributes) supported by a driver. */

-   c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;

-   c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);

-

-   /* XXX we'll need a better query here someday */

-   if (screen->get_param(screen, PIPE_CAP_GLSL)) {

-      c->GLSLVersion = 120;

-   }

-}

-

-

-/**

- * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine

- * which GL extensions are supported.

- * Quite a few extensions are always supported because they are standard

- * features or can be built on top of other gallium features.

- * Some fine tuning may still be needed.

- */

-void st_init_extensions(struct st_context *st)

-{

-   struct pipe_screen *screen = st->pipe->screen;

-   struct gl_context *ctx = st->ctx;

-

-   /*

-    * Extensions that are supported by all Gallium drivers:

-    */

-   ctx->Extensions.ARB_copy_buffer = GL_TRUE;

-   ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;

-   ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;

-   ctx->Extensions.ARB_fragment_program = GL_TRUE;

-   ctx->Extensions.ARB_half_float_pixel = GL_TRUE;

-   ctx->Extensions.ARB_map_buffer_range = GL_TRUE;

-   ctx->Extensions.ARB_multisample = GL_TRUE;

-   ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */

-   ctx->Extensions.ARB_texture_compression = GL_TRUE;

-   ctx->Extensions.ARB_texture_cube_map = GL_TRUE;

-   ctx->Extensions.ARB_texture_env_combine = GL_TRUE;

-   ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;

-   ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;

-   ctx->Extensions.ARB_vertex_array_object = GL_TRUE;

-   ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;

-   ctx->Extensions.ARB_vertex_program = GL_TRUE;

-   ctx->Extensions.ARB_window_pos = GL_TRUE;

-

-   ctx->Extensions.EXT_blend_color = GL_TRUE;

-   ctx->Extensions.EXT_blend_func_separate = GL_TRUE;

-   ctx->Extensions.EXT_blend_logic_op = GL_TRUE;

-   ctx->Extensions.EXT_blend_minmax = GL_TRUE;

-   ctx->Extensions.EXT_blend_subtract = GL_TRUE;

-   ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;

-   ctx->Extensions.EXT_framebuffer_object = GL_TRUE;

-   ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;

-   ctx->Extensions.EXT_fog_coord = GL_TRUE;

-   ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;

-   ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;

-   ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;

-   ctx->Extensions.EXT_point_parameters = GL_TRUE;

-   ctx->Extensions.EXT_provoking_vertex = GL_TRUE;

-   ctx->Extensions.EXT_secondary_color = GL_TRUE;

-   ctx->Extensions.EXT_stencil_wrap = GL_TRUE;

-   ctx->Extensions.EXT_texture_env_add = GL_TRUE;

-   ctx->Extensions.EXT_texture_env_combine = GL_TRUE;

-   ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;

-   ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;

-   ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;

-   if (ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2)

-	   ctx->Extensions.EXT_texture_format_BGRA8888 = GL_TRUE;

-

-   ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;

-

-   ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;

-

-   ctx->Extensions.MESA_pack_invert = GL_TRUE;

-

-   ctx->Extensions.NV_blend_square = GL_TRUE;

-   ctx->Extensions.NV_texgen_reflection = GL_TRUE;

-   ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;

-   ctx->Extensions.NV_texture_rectangle = GL_TRUE;

-#if 0

-   /* possibly could support the following two */

-   ctx->Extensions.NV_vertex_program = GL_TRUE;

-   ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;

-#endif

-

-#if FEATURE_OES_EGL_image

-   ctx->Extensions.OES_EGL_image = GL_TRUE;

-#endif

-#if FEATURE_OES_draw_texture

-   ctx->Extensions.OES_draw_texture = GL_TRUE;

-#endif

-

-   ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;

-

-   /*

-    * Extensions that depend on the driver/hardware:

-    */

-   if (screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS) > 0) {

-      ctx->Extensions.ARB_draw_buffers = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {

-      ctx->Extensions.EXT_texture_swizzle = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_GLSL)) {

-      ctx->Extensions.ARB_fragment_shader = GL_TRUE;

-      ctx->Extensions.ARB_vertex_shader = GL_TRUE;

-      ctx->Extensions.ARB_shader_objects = GL_TRUE;

-      ctx->Extensions.ARB_shading_language_100 = GL_TRUE;

-      ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;

-      ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_REPEAT) > 0) {

-      ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {

-      ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {

-      ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;

-      ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {

-      ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {

-      ctx->Extensions.ARB_multitexture = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {

-      ctx->Extensions.ATI_separate_stencil = GL_TRUE;

-      ctx->Extensions.EXT_stencil_two_side = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {

-      ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {

-      ctx->Extensions.ARB_point_sprite = GL_TRUE;

-      /* GL_NV_point_sprite is not supported by gallium because we don't

-       * support the GL_POINT_SPRITE_R_MODE_NV option.

-       */

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {

-      ctx->Extensions.ARB_occlusion_query = GL_TRUE;

-      ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;

-   }

-   if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {

-     ctx->Extensions.EXT_timer_query = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {

-      ctx->Extensions.ARB_depth_texture = GL_TRUE;

-      ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;

-      ctx->Extensions.ARB_shadow = GL_TRUE;

-      ctx->Extensions.EXT_shadow_funcs = GL_TRUE;

-      /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/

-   }

-

-   /* GL_EXT_packed_depth_stencil requires both the ability to render to

-    * a depth/stencil buffer and texture from depth/stencil source.

-    */

-   if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_DEPTH_STENCIL, 0) &&

-       screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_SAMPLER_VIEW, 0)) {

-      ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;

-   }

-   else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,

-                                        PIPE_TEXTURE_2D, 0,

-                                        PIPE_BIND_DEPTH_STENCIL, 0) &&

-            screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,

-                                        PIPE_TEXTURE_2D, 0,

-                                        PIPE_BIND_SAMPLER_VIEW, 0)) {

-      ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;

-   }

-

-   /* sRGB support */

-   if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_SAMPLER_VIEW, 0) ||

-      screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_SAMPLER_VIEW, 0)) {

-      ctx->Extensions.EXT_texture_sRGB = GL_TRUE;

-      ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;

-      if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_RENDER_TARGET, 0) ||

-          screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_RENDER_TARGET, 0)) {

-         ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;

-         ctx->Const.sRGBCapable = GL_TRUE;

-      }

-   }

-

-   if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_SAMPLER_VIEW, 0)) {

-      ctx->Extensions.ARB_texture_rg = GL_TRUE;

-   }

-

-   /* s3tc support */

-   if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_SAMPLER_VIEW, 0) &&

-       ctx->Mesa_DXTn) {

-      ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;

-      ctx->Extensions.S3_s3tc = GL_TRUE;

-   }

-

-   /* ycbcr support */

-   if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY, 

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_SAMPLER_VIEW, 0) ||

-       screen->is_format_supported(screen, PIPE_FORMAT_YUYV, 

-                                   PIPE_TEXTURE_2D, 0,

-                                   PIPE_BIND_SAMPLER_VIEW, 0)) {

-      ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;

-   }

-

-   /* GL_EXT_texture_array */

-   if (screen->get_param(screen, PIPE_CAP_ARRAY_TEXTURES)) {

-      ctx->Extensions.EXT_texture_array = GL_TRUE;

-      ctx->Extensions.MESA_texture_array = GL_TRUE;

-   }

-

-   /* GL_ARB_framebuffer_object */

-   if (ctx->Extensions.EXT_packed_depth_stencil) {

-      /* we support always support GL_EXT_framebuffer_blit */

-      ctx->Extensions.ARB_framebuffer_object = GL_TRUE;

-   }

-

-   if (st->pipe->render_condition) {

-      ctx->Extensions.NV_conditional_render = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {

-      ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {

-      ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;

-   }

-

-   /* GL_ARB_half_float_vertex */

-   if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,

-                                   PIPE_BUFFER, 0,

-                                   PIPE_BIND_VERTEX_BUFFER, 0)) {

-      ctx->Extensions.ARB_half_float_vertex = GL_TRUE;

-   }

-

-   if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {

-#if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */

-      ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;

-#endif

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {

-      ctx->Extensions.NV_primitive_restart = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {

-      ctx->Extensions.ARB_depth_clamp = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {

-      ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;

-   }

-

-   if (screen->get_param(screen, PIPE_CAP_INSTANCED_DRAWING)) {

-      ctx->Extensions.ARB_draw_instanced = GL_TRUE;

-      ctx->Extensions.ARB_instanced_arrays = GL_TRUE;

-   }

-}

+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ * 
+ **************************************************************************/
+
+#include "main/imports.h"
+#include "main/context.h"
+#include "main/macros.h"
+#include "main/mfeatures.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_screen.h"
+
+#include "st_context.h"
+#include "st_extensions.h"
+
+
+static int _min(int a, int b)
+{
+   return (a < b) ? a : b;
+}
+
+static float _maxf(float a, float b)
+{
+   return (a > b) ? a : b;
+}
+
+static int _clamp(int a, int min, int max)
+{
+   if (a < min)
+      return min;
+   else if (a > max)
+      return max;
+   else
+      return a;
+}
+
+
+/**
+ * Query driver to get implementation limits.
+ * Note that we have to limit/clamp against Mesa's internal limits too.
+ */
+void st_init_limits(struct st_context *st)
+{
+   struct pipe_screen *screen = st->pipe->screen;
+   struct gl_constants *c = &st->ctx->Const;
+   gl_shader_type sh;
+
+   c->MaxTextureLevels
+      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
+            MAX_TEXTURE_LEVELS);
+
+   c->Max3DTextureLevels
+      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
+            MAX_3D_TEXTURE_LEVELS);
+
+   c->MaxCubeTextureLevels
+      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
+            MAX_CUBE_TEXTURE_LEVELS);
+
+   c->MaxTextureRectSize
+      = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
+
+   c->MaxTextureImageUnits
+      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS),
+            MAX_TEXTURE_IMAGE_UNITS);
+
+   c->MaxVertexTextureImageUnits
+      = _min(screen->get_param(screen, PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS),
+             MAX_VERTEX_TEXTURE_IMAGE_UNITS);
+
+   c->MaxCombinedTextureImageUnits
+      = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
+             MAX_COMBINED_TEXTURE_IMAGE_UNITS);
+
+   c->MaxTextureCoordUnits
+      = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
+
+   c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
+
+   c->MaxDrawBuffers
+      = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
+              1, MAX_DRAW_BUFFERS);
+
+   c->MaxLineWidth
+      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH));
+   c->MaxLineWidthAA
+      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));
+
+   c->MaxPointSize
+      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));
+   c->MaxPointSizeAA
+      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));
+   /* called after _mesa_create_context/_mesa_init_point, fix default user
+    * settable max point size up
+    */
+   st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
+   /* these are not queryable. Note that GL basically mandates a 1.0 minimum
+    * for non-aa sizes, but we can go down to 0.0 for aa points.
+    */
+   c->MinPointSize = 1.0f;
+   c->MinPointSizeAA = 0.0f;
+
+   c->MaxTextureMaxAnisotropy
+      = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));
+
+   c->MaxTextureLodBias
+      = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);
+
+   c->MaxDrawBuffers
+      = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
+              1, MAX_DRAW_BUFFERS);
+
+   /* Quads always follow GL provoking rules. */
+   c->QuadsFollowProvokingVertexConvention = GL_FALSE;
+
+   for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
+      struct gl_shader_compiler_options *options =
+         &st->ctx->ShaderCompilerOptions[sh];
+      struct gl_program_constants *pc;
+
+      switch (sh) {
+      case PIPE_SHADER_FRAGMENT:
+         pc = &c->FragmentProgram;
+         break;
+      case PIPE_SHADER_VERTEX:
+         pc = &c->VertexProgram;
+         break;
+      case PIPE_SHADER_GEOMETRY:
+         pc = &c->GeometryProgram;
+         break;
+      default:
+         assert(0);
+         continue;
+      }
+
+      pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
+      pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
+      pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
+      pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
+      pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
+      pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
+      pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
+      pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
+      pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
+
+      options->EmitNoNoise = TRUE;
+
+      /* TODO: make these more fine-grained if anyone needs it */
+      options->EmitNoIfs = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
+      options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
+      options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
+      options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
+
+      options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
+
+      options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
+                                        PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
+      options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
+                                        PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
+      options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
+                                        PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
+      options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
+                                        PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
+
+      if(options->EmitNoLoops)
+         options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
+   }
+
+   /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs
+    * and is set in MaxNativeAttribs. It's always 2 colors + N generic
+    * attributes. The GLSL compiler never uses COLORn for varyings, so we
+    * subtract the 2 colors to get the maximum number of varyings (generic
+    * attributes) supported by a driver. */
+   c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;
+   c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
+
+   /* XXX we'll need a better query here someday */
+   if (screen->get_param(screen, PIPE_CAP_GLSL)) {
+      c->GLSLVersion = 120;
+   }
+}
+
+
+/**
+ * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
+ * which GL extensions are supported.
+ * Quite a few extensions are always supported because they are standard
+ * features or can be built on top of other gallium features.
+ * Some fine tuning may still be needed.
+ */
+void st_init_extensions(struct st_context *st)
+{
+   struct pipe_screen *screen = st->pipe->screen;
+   struct gl_context *ctx = st->ctx;
+
+   /*
+    * Extensions that are supported by all Gallium drivers:
+    */
+   ctx->Extensions.ARB_copy_buffer = GL_TRUE;
+   ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
+   ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
+   ctx->Extensions.ARB_fragment_program = GL_TRUE;
+   ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
+   ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
+   ctx->Extensions.ARB_multisample = GL_TRUE;
+   ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
+   ctx->Extensions.ARB_texture_compression = GL_TRUE;
+   ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
+   ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
+   ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
+   ctx->Extensions.ARB_vertex_program = GL_TRUE;
+   ctx->Extensions.ARB_window_pos = GL_TRUE;
+
+   ctx->Extensions.EXT_blend_color = GL_TRUE;
+   ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
+   ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
+   ctx->Extensions.EXT_blend_minmax = GL_TRUE;
+   ctx->Extensions.EXT_blend_subtract = GL_TRUE;
+   ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
+   ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
+   ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
+   ctx->Extensions.EXT_fog_coord = GL_TRUE;
+   ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
+   ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
+   ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
+   ctx->Extensions.EXT_point_parameters = GL_TRUE;
+   ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
+   ctx->Extensions.EXT_secondary_color = GL_TRUE;
+   ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_add = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
+   ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
+   ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
+   if (ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2)
+	   ctx->Extensions.EXT_texture_format_BGRA8888 = GL_TRUE;
+
+   ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
+
+   ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
+
+   ctx->Extensions.MESA_pack_invert = GL_TRUE;
+
+   ctx->Extensions.NV_blend_square = GL_TRUE;
+   ctx->Extensions.NV_texgen_reflection = GL_TRUE;
+   ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
+   ctx->Extensions.NV_texture_rectangle = GL_TRUE;
+#if 0
+   /* possibly could support the following two */
+   ctx->Extensions.NV_vertex_program = GL_TRUE;
+   ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
+#endif
+
+#if FEATURE_OES_EGL_image
+   ctx->Extensions.OES_EGL_image = GL_TRUE;
+#endif
+#if FEATURE_OES_draw_texture
+   ctx->Extensions.OES_draw_texture = GL_TRUE;
+#endif
+
+   ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
+
+   /*
+    * Extensions that depend on the driver/hardware:
+    */
+   if (screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS) > 0) {
+      ctx->Extensions.ARB_draw_buffers = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
+      ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_GLSL)) {
+      ctx->Extensions.ARB_fragment_shader = GL_TRUE;
+      ctx->Extensions.ARB_vertex_shader = GL_TRUE;
+      ctx->Extensions.ARB_shader_objects = GL_TRUE;
+      ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
+      ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
+      ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_REPEAT) > 0) {
+      ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
+      ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
+      ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
+      ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
+      ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {
+      ctx->Extensions.ARB_multitexture = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
+      ctx->Extensions.ATI_separate_stencil = GL_TRUE;
+      ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
+      ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
+      ctx->Extensions.ARB_point_sprite = GL_TRUE;
+      /* GL_NV_point_sprite is not supported by gallium because we don't
+       * support the GL_POINT_SPRITE_R_MODE_NV option.
+       */
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
+      ctx->Extensions.ARB_occlusion_query = GL_TRUE;
+      ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
+   }
+   if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
+     ctx->Extensions.EXT_timer_query = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
+      ctx->Extensions.ARB_depth_texture = GL_TRUE;
+      ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
+      ctx->Extensions.ARB_shadow = GL_TRUE;
+      ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
+      /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
+   }
+
+   /* GL_EXT_packed_depth_stencil requires both the ability to render to
+    * a depth/stencil buffer and texture from depth/stencil source.
+    */
+   if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_DEPTH_STENCIL, 0) &&
+       screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0)) {
+      ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
+   }
+   else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
+                                        PIPE_TEXTURE_2D, 0,
+                                        PIPE_BIND_DEPTH_STENCIL, 0) &&
+            screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
+                                        PIPE_TEXTURE_2D, 0,
+                                        PIPE_BIND_SAMPLER_VIEW, 0)) {
+      ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
+   }
+
+   /* sRGB support */
+   if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0) ||
+      screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0)) {
+      ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
+      ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
+      if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_RENDER_TARGET, 0) ||
+          screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_RENDER_TARGET, 0)) {
+         ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
+         ctx->Const.sRGBCapable = GL_TRUE;
+      }
+   }
+
+   if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0)) {
+      ctx->Extensions.ARB_texture_rg = GL_TRUE;
+   }
+
+   /* s3tc support */
+   if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0) &&
+       ctx->Mesa_DXTn) {
+      ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
+      ctx->Extensions.S3_s3tc = GL_TRUE;
+   }
+
+   if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0) &&
+       screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
+				   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0) &&
+       screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0) &&
+       screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0)
+       ) {
+     ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
+   }
+
+   /* ycbcr support */
+   if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY, 
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0) ||
+       screen->is_format_supported(screen, PIPE_FORMAT_YUYV, 
+                                   PIPE_TEXTURE_2D, 0,
+                                   PIPE_BIND_SAMPLER_VIEW, 0)) {
+      ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
+   }
+
+   /* GL_EXT_texture_array */
+   if (screen->get_param(screen, PIPE_CAP_ARRAY_TEXTURES)) {
+      ctx->Extensions.EXT_texture_array = GL_TRUE;
+      ctx->Extensions.MESA_texture_array = GL_TRUE;
+   }
+
+   /* GL_ARB_framebuffer_object */
+   if (ctx->Extensions.EXT_packed_depth_stencil) {
+      /* we support always support GL_EXT_framebuffer_blit */
+      ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
+   }
+
+   if (st->pipe->render_condition) {
+      ctx->Extensions.NV_conditional_render = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
+      ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
+      ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
+   }
+
+   /* GL_ARB_half_float_vertex */
+   if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
+                                   PIPE_BUFFER, 0,
+                                   PIPE_BIND_VERTEX_BUFFER, 0)) {
+      ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
+   }
+
+   if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
+#if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
+      ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
+#endif
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
+      ctx->Extensions.NV_primitive_restart = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
+      ctx->Extensions.ARB_depth_clamp = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
+      ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
+   }
+
+   if (screen->get_param(screen, PIPE_CAP_INSTANCED_DRAWING)) {
+      ctx->Extensions.ARB_draw_instanced = GL_TRUE;
+      ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
+   }
+}