xserver and mesa git update 28-12-2010

1 files changed, 541 insertions, 541 deletions

diff --git a/mesalib/src/mesa/main/feedback.c b/mesalib/src/mesa/main/feedback.c
index c72b91280..5ce0880c2 100644
--- a/mesalib/src/mesa/main/feedback.c
+++ b/mesalib/src/mesa/main/feedback.c
@@ -1,541 +1,541 @@
-/*
- * Mesa 3-D graphics library
- * Version:  7.5
- *
- * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
- * Copyright (C) 2009  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 feedback.c
- * Selection and feedback modes functions.
- */
-
-
-#include "glheader.h"
-#include "colormac.h"
-#include "context.h"
-#include "enums.h"
-#include "feedback.h"
-#include "macros.h"
-#include "mtypes.h"
-#include "main/dispatch.h"
-
-
-#if FEATURE_feedback
-
-
-#define FB_3D		0x01
-#define FB_4D		0x02
-#define FB_COLOR	0x04
-#define FB_TEXTURE	0X08
-
-
-
-static void GLAPIENTRY
-_mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   if (ctx->RenderMode==GL_FEEDBACK) {
-      _mesa_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
-      return;
-   }
-   if (size<0) {
-      _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
-      return;
-   }
-   if (!buffer) {
-      _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
-      ctx->Feedback.BufferSize = 0;
-      return;
-   }
-
-   switch (type) {
-      case GL_2D:
-	 ctx->Feedback._Mask = 0;
-	 break;
-      case GL_3D:
-	 ctx->Feedback._Mask = FB_3D;
-	 break;
-      case GL_3D_COLOR:
-	 ctx->Feedback._Mask = (FB_3D | FB_COLOR);
-	 break;
-      case GL_3D_COLOR_TEXTURE:
-	 ctx->Feedback._Mask = (FB_3D | FB_COLOR | FB_TEXTURE);
-	 break;
-      case GL_4D_COLOR_TEXTURE:
-	 ctx->Feedback._Mask = (FB_3D | FB_4D | FB_COLOR | FB_TEXTURE);
-	 break;
-      default:
-         _mesa_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
-	 return;
-   }
-
-   FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* Always flush */
-   ctx->Feedback.Type = type;
-   ctx->Feedback.BufferSize = size;
-   ctx->Feedback.Buffer = buffer;
-   ctx->Feedback.Count = 0;	              /* Becaues of this. */
-}
-
-
-static void GLAPIENTRY
-_mesa_PassThrough( GLfloat token )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   if (ctx->RenderMode==GL_FEEDBACK) {
-      FLUSH_VERTICES(ctx, 0);
-      _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
-      _mesa_feedback_token( ctx, token );
-   }
-}
-
-
-/**
- * Put a vertex into the feedback buffer.
- */
-void
-_mesa_feedback_vertex(GLcontext *ctx,
-                      const GLfloat win[4],
-                      const GLfloat color[4],
-                      const GLfloat texcoord[4])
-{
-   _mesa_feedback_token( ctx, win[0] );
-   _mesa_feedback_token( ctx, win[1] );
-   if (ctx->Feedback._Mask & FB_3D) {
-      _mesa_feedback_token( ctx, win[2] );
-   }
-   if (ctx->Feedback._Mask & FB_4D) {
-      _mesa_feedback_token( ctx, win[3] );
-   }
-   if (ctx->Feedback._Mask & FB_COLOR) {
-      _mesa_feedback_token( ctx, color[0] );
-      _mesa_feedback_token( ctx, color[1] );
-      _mesa_feedback_token( ctx, color[2] );
-      _mesa_feedback_token( ctx, color[3] );
-   }
-   if (ctx->Feedback._Mask & FB_TEXTURE) {
-      _mesa_feedback_token( ctx, texcoord[0] );
-      _mesa_feedback_token( ctx, texcoord[1] );
-      _mesa_feedback_token( ctx, texcoord[2] );
-      _mesa_feedback_token( ctx, texcoord[3] );
-   }
-}
-
-
-/**********************************************************************/
-/** \name Selection */
-/*@{*/
-
-/**
- * Establish a buffer for selection mode values.
- * 
- * \param size buffer size.
- * \param buffer buffer.
- *
- * \sa glSelectBuffer().
- * 
- * \note this function can't be put in a display list.
- * 
- * Verifies we're not in selection mode, flushes the vertices and initialize
- * the fields in __GLcontextRec::Select with the given buffer.
- */
-static void GLAPIENTRY
-_mesa_SelectBuffer( GLsizei size, GLuint *buffer )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   if (ctx->RenderMode==GL_SELECT) {
-      _mesa_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
-      return;			/* KW: added return */
-   }
-
-   FLUSH_VERTICES(ctx, _NEW_RENDERMODE); 
-   ctx->Select.Buffer = buffer;
-   ctx->Select.BufferSize = size;
-   ctx->Select.BufferCount = 0;
-   ctx->Select.HitFlag = GL_FALSE;
-   ctx->Select.HitMinZ = 1.0;
-   ctx->Select.HitMaxZ = 0.0;
-}
-
-
-/**
- * Write a value of a record into the selection buffer.
- * 
- * \param ctx GL context.
- * \param value value.
- *
- * Verifies there is free space in the buffer to write the value and
- * increments the pointer.
- */
-static INLINE void
-write_record(GLcontext *ctx, GLuint value)
-{
-   if (ctx->Select.BufferCount < ctx->Select.BufferSize) {
-      ctx->Select.Buffer[ctx->Select.BufferCount] = value;
-   }
-   ctx->Select.BufferCount++;
-}
-
-
-/**
- * Update the hit flag and the maximum and minimum depth values.
- *
- * \param ctx GL context.
- * \param z depth.
- *
- * Sets gl_selection::HitFlag and updates gl_selection::HitMinZ and
- * gl_selection::HitMaxZ.
- */
-void
-_mesa_update_hitflag(GLcontext *ctx, GLfloat z)
-{
-   ctx->Select.HitFlag = GL_TRUE;
-   if (z < ctx->Select.HitMinZ) {
-      ctx->Select.HitMinZ = z;
-   }
-   if (z > ctx->Select.HitMaxZ) {
-      ctx->Select.HitMaxZ = z;
-   }
-}
-
-
-/**
- * Write the hit record.
- *
- * \param ctx GL context.
- *
- * Write the hit record, i.e., the number of names in the stack, the minimum and
- * maximum depth values and the number of names in the name stack at the time
- * of the event. Resets the hit flag. 
- *
- * \sa gl_selection.
- */
-static void
-write_hit_record(GLcontext *ctx)
-{
-   GLuint i;
-   GLuint zmin, zmax, zscale = (~0u);
-
-   /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
-   /* 2^32-1 and round to nearest unsigned integer. */
-
-   assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
-   zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
-   zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
-
-   write_record( ctx, ctx->Select.NameStackDepth );
-   write_record( ctx, zmin );
-   write_record( ctx, zmax );
-   for (i = 0; i < ctx->Select.NameStackDepth; i++) {
-      write_record( ctx, ctx->Select.NameStack[i] );
-   }
-
-   ctx->Select.Hits++;
-   ctx->Select.HitFlag = GL_FALSE;
-   ctx->Select.HitMinZ = 1.0;
-   ctx->Select.HitMaxZ = -1.0;
-}
-
-
-/**
- * Initialize the name stack.
- *
- * Verifies we are in select mode and resets the name stack depth and resets
- * the hit record data in gl_selection. Marks new render mode in
- * __GLcontextRec::NewState.
- */
-static void GLAPIENTRY
-_mesa_InitNames( void )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
-   /* Record the hit before the HitFlag is wiped out again. */
-   if (ctx->RenderMode == GL_SELECT) {
-      if (ctx->Select.HitFlag) {
-         write_hit_record( ctx );
-      }
-   }
-   ctx->Select.NameStackDepth = 0;
-   ctx->Select.HitFlag = GL_FALSE;
-   ctx->Select.HitMinZ = 1.0;
-   ctx->Select.HitMaxZ = 0.0;
-   ctx->NewState |= _NEW_RENDERMODE;
-}
-
-
-/**
- * Load the top-most name of the name stack.
- *
- * \param name name.
- *
- * Verifies we are in selection mode and that the name stack is not empty.
- * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),
- * and replace the top-most name in the stack.
- *
- * sa __GLcontextRec::Select.
- */
-static void GLAPIENTRY
-_mesa_LoadName( GLuint name )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   if (ctx->RenderMode != GL_SELECT) {
-      return;
-   }
-   if (ctx->Select.NameStackDepth == 0) {
-      _mesa_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
-      return;
-   }
-
-   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
-
-   if (ctx->Select.HitFlag) {
-      write_hit_record( ctx );
-   }
-   if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
-      ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
-   }
-   else {
-      ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
-   }
-}
-
-
-/**
- * Push a name into the name stack.
- *
- * \param name name.
- *
- * Verifies we are in selection mode and that the name stack is not full.
- * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),
- * and adds the name to the top of the name stack.
- *
- * sa __GLcontextRec::Select.
- */
-static void GLAPIENTRY
-_mesa_PushName( GLuint name )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   if (ctx->RenderMode != GL_SELECT) {
-      return;
-   }
-
-   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
-   if (ctx->Select.HitFlag) {
-      write_hit_record( ctx );
-   }
-   if (ctx->Select.NameStackDepth >= MAX_NAME_STACK_DEPTH) {
-      _mesa_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
-   }
-   else
-      ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
-}
-
-
-/**
- * Pop a name into the name stack.
- *
- * Verifies we are in selection mode and that the name stack is not empty.
- * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),
- * and removes top-most name in the name stack.
- *
- * sa __GLcontextRec::Select.
- */
-static void GLAPIENTRY
-_mesa_PopName( void )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   if (ctx->RenderMode != GL_SELECT) {
-      return;
-   }
-
-   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
-   if (ctx->Select.HitFlag) {
-      write_hit_record( ctx );
-   }
-   if (ctx->Select.NameStackDepth == 0) {
-      _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
-   }
-   else
-      ctx->Select.NameStackDepth--;
-}
-
-/*@}*/
-
-
-/**********************************************************************/
-/** \name Render Mode */
-/*@{*/
-
-/**
- * Set rasterization mode.
- *
- * \param mode rasterization mode.
- *
- * \note this function can't be put in a display list.
- *
- * \sa glRenderMode().
- * 
- * Flushes the vertices and do the necessary cleanup according to the previous
- * rasterization mode, such as writing the hit record or resent the select
- * buffer index when exiting the select mode. Updates
- * __GLcontextRec::RenderMode and notifies the driver via the
- * dd_function_table::RenderMode callback.
- */
-static GLint GLAPIENTRY
-_mesa_RenderMode( GLenum mode )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   GLint result;
-   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
-
-   if (MESA_VERBOSE & VERBOSE_API)
-      _mesa_debug(ctx, "glRenderMode %s\n", _mesa_lookup_enum_by_nr(mode));
-
-   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
-
-   switch (ctx->RenderMode) {
-      case GL_RENDER:
-	 result = 0;
-	 break;
-      case GL_SELECT:
-	 if (ctx->Select.HitFlag) {
-	    write_hit_record( ctx );
-	 }
-	 if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
-	    /* overflow */
-#ifdef DEBUG
-            _mesa_warning(ctx, "Feedback buffer overflow");
-#endif
-	    result = -1;
-	 }
-	 else {
-	    result = ctx->Select.Hits;
-	 }
-	 ctx->Select.BufferCount = 0;
-	 ctx->Select.Hits = 0;
-	 ctx->Select.NameStackDepth = 0;
-	 break;
-#if _HAVE_FULL_GL
-      case GL_FEEDBACK:
-	 if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
-	    /* overflow */
-	    result = -1;
-	 }
-	 else {
-	    result = ctx->Feedback.Count;
-	 }
-	 ctx->Feedback.Count = 0;
-	 break;
-#endif
-      default:
-	 _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
-	 return 0;
-   }
-
-   switch (mode) {
-      case GL_RENDER:
-         break;
-      case GL_SELECT:
-	 if (ctx->Select.BufferSize==0) {
-	    /* haven't called glSelectBuffer yet */
-	    _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
-	 }
-	 break;
-#if _HAVE_FULL_GL
-      case GL_FEEDBACK:
-	 if (ctx->Feedback.BufferSize==0) {
-	    /* haven't called glFeedbackBuffer yet */
-	    _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
-	 }
-	 break;
-#endif
-      default:
-	 _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
-	 return 0;
-   }
-
-   ctx->RenderMode = mode;
-   if (ctx->Driver.RenderMode)
-      ctx->Driver.RenderMode( ctx, mode );
-
-   return result;
-}
-
-/*@}*/
-
-
-void
-_mesa_init_feedback_dispatch(struct _glapi_table *disp)
-{
-   SET_InitNames(disp, _mesa_InitNames);
-   SET_FeedbackBuffer(disp, _mesa_FeedbackBuffer);
-   SET_LoadName(disp, _mesa_LoadName);
-   SET_PassThrough(disp, _mesa_PassThrough);
-   SET_PopName(disp, _mesa_PopName);
-   SET_PushName(disp, _mesa_PushName);
-   SET_SelectBuffer(disp, _mesa_SelectBuffer);
-   SET_RenderMode(disp, _mesa_RenderMode);
-}
-
-
-#endif /* FEATURE_feedback */
-
-
-/**********************************************************************/
-/** \name Initialization */
-/*@{*/
-
-/**
- * Initialize context feedback data.
- */
-void _mesa_init_feedback( GLcontext * ctx )
-{
-   /* Feedback */
-   ctx->Feedback.Type = GL_2D;   /* TODO: verify */
-   ctx->Feedback.Buffer = NULL;
-   ctx->Feedback.BufferSize = 0;
-   ctx->Feedback.Count = 0;
-
-   /* Selection/picking */
-   ctx->Select.Buffer = NULL;
-   ctx->Select.BufferSize = 0;
-   ctx->Select.BufferCount = 0;
-   ctx->Select.Hits = 0;
-   ctx->Select.NameStackDepth = 0;
-
-   /* Miscellaneous */
-   ctx->RenderMode = GL_RENDER;
-}
-
-/*@}*/
+/*

+ * Mesa 3-D graphics library

+ * Version:  7.5

+ *

+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

+ * Copyright (C) 2009  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 feedback.c

+ * Selection and feedback modes functions.

+ */

+

+

+#include "glheader.h"

+#include "colormac.h"

+#include "context.h"

+#include "enums.h"

+#include "feedback.h"

+#include "macros.h"

+#include "mtypes.h"

+#include "main/dispatch.h"

+

+

+#if FEATURE_feedback

+

+

+#define FB_3D		0x01

+#define FB_4D		0x02

+#define FB_COLOR	0x04

+#define FB_TEXTURE	0X08

+

+

+

+static void GLAPIENTRY

+_mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   if (ctx->RenderMode==GL_FEEDBACK) {

+      _mesa_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );

+      return;

+   }

+   if (size<0) {

+      _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );

+      return;

+   }

+   if (!buffer) {

+      _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );

+      ctx->Feedback.BufferSize = 0;

+      return;

+   }

+

+   switch (type) {

+      case GL_2D:

+	 ctx->Feedback._Mask = 0;

+	 break;

+      case GL_3D:

+	 ctx->Feedback._Mask = FB_3D;

+	 break;

+      case GL_3D_COLOR:

+	 ctx->Feedback._Mask = (FB_3D | FB_COLOR);

+	 break;

+      case GL_3D_COLOR_TEXTURE:

+	 ctx->Feedback._Mask = (FB_3D | FB_COLOR | FB_TEXTURE);

+	 break;

+      case GL_4D_COLOR_TEXTURE:

+	 ctx->Feedback._Mask = (FB_3D | FB_4D | FB_COLOR | FB_TEXTURE);

+	 break;

+      default:

+         _mesa_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );

+	 return;

+   }

+

+   FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* Always flush */

+   ctx->Feedback.Type = type;

+   ctx->Feedback.BufferSize = size;

+   ctx->Feedback.Buffer = buffer;

+   ctx->Feedback.Count = 0;	              /* Becaues of this. */

+}

+

+

+static void GLAPIENTRY

+_mesa_PassThrough( GLfloat token )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   if (ctx->RenderMode==GL_FEEDBACK) {

+      FLUSH_VERTICES(ctx, 0);

+      _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );

+      _mesa_feedback_token( ctx, token );

+   }

+}

+

+

+/**

+ * Put a vertex into the feedback buffer.

+ */

+void

+_mesa_feedback_vertex(struct gl_context *ctx,

+                      const GLfloat win[4],

+                      const GLfloat color[4],

+                      const GLfloat texcoord[4])

+{

+   _mesa_feedback_token( ctx, win[0] );

+   _mesa_feedback_token( ctx, win[1] );

+   if (ctx->Feedback._Mask & FB_3D) {

+      _mesa_feedback_token( ctx, win[2] );

+   }

+   if (ctx->Feedback._Mask & FB_4D) {

+      _mesa_feedback_token( ctx, win[3] );

+   }

+   if (ctx->Feedback._Mask & FB_COLOR) {

+      _mesa_feedback_token( ctx, color[0] );

+      _mesa_feedback_token( ctx, color[1] );

+      _mesa_feedback_token( ctx, color[2] );

+      _mesa_feedback_token( ctx, color[3] );

+   }

+   if (ctx->Feedback._Mask & FB_TEXTURE) {

+      _mesa_feedback_token( ctx, texcoord[0] );

+      _mesa_feedback_token( ctx, texcoord[1] );

+      _mesa_feedback_token( ctx, texcoord[2] );

+      _mesa_feedback_token( ctx, texcoord[3] );

+   }

+}

+

+

+/**********************************************************************/

+/** \name Selection */

+/*@{*/

+

+/**

+ * Establish a buffer for selection mode values.

+ * 

+ * \param size buffer size.

+ * \param buffer buffer.

+ *

+ * \sa glSelectBuffer().

+ * 

+ * \note this function can't be put in a display list.

+ * 

+ * Verifies we're not in selection mode, flushes the vertices and initialize

+ * the fields in __struct gl_contextRec::Select with the given buffer.

+ */

+static void GLAPIENTRY

+_mesa_SelectBuffer( GLsizei size, GLuint *buffer )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   if (ctx->RenderMode==GL_SELECT) {

+      _mesa_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );

+      return;			/* KW: added return */

+   }

+

+   FLUSH_VERTICES(ctx, _NEW_RENDERMODE); 

+   ctx->Select.Buffer = buffer;

+   ctx->Select.BufferSize = size;

+   ctx->Select.BufferCount = 0;

+   ctx->Select.HitFlag = GL_FALSE;

+   ctx->Select.HitMinZ = 1.0;

+   ctx->Select.HitMaxZ = 0.0;

+}

+

+

+/**

+ * Write a value of a record into the selection buffer.

+ * 

+ * \param ctx GL context.

+ * \param value value.

+ *

+ * Verifies there is free space in the buffer to write the value and

+ * increments the pointer.

+ */

+static INLINE void

+write_record(struct gl_context *ctx, GLuint value)

+{

+   if (ctx->Select.BufferCount < ctx->Select.BufferSize) {

+      ctx->Select.Buffer[ctx->Select.BufferCount] = value;

+   }

+   ctx->Select.BufferCount++;

+}

+

+

+/**

+ * Update the hit flag and the maximum and minimum depth values.

+ *

+ * \param ctx GL context.

+ * \param z depth.

+ *

+ * Sets gl_selection::HitFlag and updates gl_selection::HitMinZ and

+ * gl_selection::HitMaxZ.

+ */

+void

+_mesa_update_hitflag(struct gl_context *ctx, GLfloat z)

+{

+   ctx->Select.HitFlag = GL_TRUE;

+   if (z < ctx->Select.HitMinZ) {

+      ctx->Select.HitMinZ = z;

+   }

+   if (z > ctx->Select.HitMaxZ) {

+      ctx->Select.HitMaxZ = z;

+   }

+}

+

+

+/**

+ * Write the hit record.

+ *

+ * \param ctx GL context.

+ *

+ * Write the hit record, i.e., the number of names in the stack, the minimum and

+ * maximum depth values and the number of names in the name stack at the time

+ * of the event. Resets the hit flag. 

+ *

+ * \sa gl_selection.

+ */

+static void

+write_hit_record(struct gl_context *ctx)

+{

+   GLuint i;

+   GLuint zmin, zmax, zscale = (~0u);

+

+   /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */

+   /* 2^32-1 and round to nearest unsigned integer. */

+

+   assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */

+   zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);

+   zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);

+

+   write_record( ctx, ctx->Select.NameStackDepth );

+   write_record( ctx, zmin );

+   write_record( ctx, zmax );

+   for (i = 0; i < ctx->Select.NameStackDepth; i++) {

+      write_record( ctx, ctx->Select.NameStack[i] );

+   }

+

+   ctx->Select.Hits++;

+   ctx->Select.HitFlag = GL_FALSE;

+   ctx->Select.HitMinZ = 1.0;

+   ctx->Select.HitMaxZ = -1.0;

+}

+

+

+/**

+ * Initialize the name stack.

+ *

+ * Verifies we are in select mode and resets the name stack depth and resets

+ * the hit record data in gl_selection. Marks new render mode in

+ * __struct gl_contextRec::NewState.

+ */

+static void GLAPIENTRY

+_mesa_InitNames( void )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

+

+   /* Record the hit before the HitFlag is wiped out again. */

+   if (ctx->RenderMode == GL_SELECT) {

+      if (ctx->Select.HitFlag) {

+         write_hit_record( ctx );

+      }

+   }

+   ctx->Select.NameStackDepth = 0;

+   ctx->Select.HitFlag = GL_FALSE;

+   ctx->Select.HitMinZ = 1.0;

+   ctx->Select.HitMaxZ = 0.0;

+   ctx->NewState |= _NEW_RENDERMODE;

+}

+

+

+/**

+ * Load the top-most name of the name stack.

+ *

+ * \param name name.

+ *

+ * Verifies we are in selection mode and that the name stack is not empty.

+ * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),

+ * and replace the top-most name in the stack.

+ *

+ * sa __struct gl_contextRec::Select.

+ */

+static void GLAPIENTRY

+_mesa_LoadName( GLuint name )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   if (ctx->RenderMode != GL_SELECT) {

+      return;

+   }

+   if (ctx->Select.NameStackDepth == 0) {

+      _mesa_error( ctx, GL_INVALID_OPERATION, "glLoadName" );

+      return;

+   }

+

+   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);

+

+   if (ctx->Select.HitFlag) {

+      write_hit_record( ctx );

+   }

+   if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {

+      ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;

+   }

+   else {

+      ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;

+   }

+}

+

+

+/**

+ * Push a name into the name stack.

+ *

+ * \param name name.

+ *

+ * Verifies we are in selection mode and that the name stack is not full.

+ * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),

+ * and adds the name to the top of the name stack.

+ *

+ * sa __struct gl_contextRec::Select.

+ */

+static void GLAPIENTRY

+_mesa_PushName( GLuint name )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   if (ctx->RenderMode != GL_SELECT) {

+      return;

+   }

+

+   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);

+   if (ctx->Select.HitFlag) {

+      write_hit_record( ctx );

+   }

+   if (ctx->Select.NameStackDepth >= MAX_NAME_STACK_DEPTH) {

+      _mesa_error( ctx, GL_STACK_OVERFLOW, "glPushName" );

+   }

+   else

+      ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;

+}

+

+

+/**

+ * Pop a name into the name stack.

+ *

+ * Verifies we are in selection mode and that the name stack is not empty.

+ * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),

+ * and removes top-most name in the name stack.

+ *

+ * sa __struct gl_contextRec::Select.

+ */

+static void GLAPIENTRY

+_mesa_PopName( void )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   if (ctx->RenderMode != GL_SELECT) {

+      return;

+   }

+

+   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);

+   if (ctx->Select.HitFlag) {

+      write_hit_record( ctx );

+   }

+   if (ctx->Select.NameStackDepth == 0) {

+      _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );

+   }

+   else

+      ctx->Select.NameStackDepth--;

+}

+

+/*@}*/

+

+

+/**********************************************************************/

+/** \name Render Mode */

+/*@{*/

+

+/**

+ * Set rasterization mode.

+ *

+ * \param mode rasterization mode.

+ *

+ * \note this function can't be put in a display list.

+ *

+ * \sa glRenderMode().

+ * 

+ * Flushes the vertices and do the necessary cleanup according to the previous

+ * rasterization mode, such as writing the hit record or resent the select

+ * buffer index when exiting the select mode. Updates

+ * __struct gl_contextRec::RenderMode and notifies the driver via the

+ * dd_function_table::RenderMode callback.

+ */

+static GLint GLAPIENTRY

+_mesa_RenderMode( GLenum mode )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   GLint result;

+   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);

+

+   if (MESA_VERBOSE & VERBOSE_API)

+      _mesa_debug(ctx, "glRenderMode %s\n", _mesa_lookup_enum_by_nr(mode));

+

+   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);

+

+   switch (ctx->RenderMode) {

+      case GL_RENDER:

+	 result = 0;

+	 break;

+      case GL_SELECT:

+	 if (ctx->Select.HitFlag) {

+	    write_hit_record( ctx );

+	 }

+	 if (ctx->Select.BufferCount > ctx->Select.BufferSize) {

+	    /* overflow */

+#ifdef DEBUG

+            _mesa_warning(ctx, "Feedback buffer overflow");

+#endif

+	    result = -1;

+	 }

+	 else {

+	    result = ctx->Select.Hits;

+	 }

+	 ctx->Select.BufferCount = 0;

+	 ctx->Select.Hits = 0;

+	 ctx->Select.NameStackDepth = 0;

+	 break;

+#if _HAVE_FULL_GL

+      case GL_FEEDBACK:

+	 if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {

+	    /* overflow */

+	    result = -1;

+	 }

+	 else {

+	    result = ctx->Feedback.Count;

+	 }

+	 ctx->Feedback.Count = 0;

+	 break;

+#endif

+      default:

+	 _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );

+	 return 0;

+   }

+

+   switch (mode) {

+      case GL_RENDER:

+         break;

+      case GL_SELECT:

+	 if (ctx->Select.BufferSize==0) {

+	    /* haven't called glSelectBuffer yet */

+	    _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );

+	 }

+	 break;

+#if _HAVE_FULL_GL

+      case GL_FEEDBACK:

+	 if (ctx->Feedback.BufferSize==0) {

+	    /* haven't called glFeedbackBuffer yet */

+	    _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );

+	 }

+	 break;

+#endif

+      default:

+	 _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );

+	 return 0;

+   }

+

+   ctx->RenderMode = mode;

+   if (ctx->Driver.RenderMode)

+      ctx->Driver.RenderMode( ctx, mode );

+

+   return result;

+}

+

+/*@}*/

+

+

+void

+_mesa_init_feedback_dispatch(struct _glapi_table *disp)

+{

+   SET_InitNames(disp, _mesa_InitNames);

+   SET_FeedbackBuffer(disp, _mesa_FeedbackBuffer);

+   SET_LoadName(disp, _mesa_LoadName);

+   SET_PassThrough(disp, _mesa_PassThrough);

+   SET_PopName(disp, _mesa_PopName);

+   SET_PushName(disp, _mesa_PushName);

+   SET_SelectBuffer(disp, _mesa_SelectBuffer);

+   SET_RenderMode(disp, _mesa_RenderMode);

+}

+

+

+#endif /* FEATURE_feedback */

+

+

+/**********************************************************************/

+/** \name Initialization */

+/*@{*/

+

+/**

+ * Initialize context feedback data.

+ */

+void _mesa_init_feedback( struct gl_context * ctx )

+{

+   /* Feedback */

+   ctx->Feedback.Type = GL_2D;   /* TODO: verify */

+   ctx->Feedback.Buffer = NULL;

+   ctx->Feedback.BufferSize = 0;

+   ctx->Feedback.Count = 0;

+

+   /* Selection/picking */

+   ctx->Select.Buffer = NULL;

+   ctx->Select.BufferSize = 0;

+   ctx->Select.BufferCount = 0;

+   ctx->Select.Hits = 0;

+   ctx->Select.NameStackDepth = 0;

+

+   /* Miscellaneous */

+   ctx->RenderMode = GL_RENDER;

+}

+

+/*@}*/