GLSL fixes:

- generate error on NULL pointers in glShaderSourceARB;
- reinstall program object, if current, in glLinkProgramARB;
- vertex and fragment shaders are optional in program object;
- floor asm was wrongly computed for x86 back-end;
- allow for (void) idiom in function prototypes;
- all fixed-state uniforms are updated;
- local variable initializers are working;
- implement texture* and shadow* functions for vertex processor;
- generate error if too many arguments in general constructor;
- trim unused data in general constructor;
- struct r-value field select was badly relocated;

Changes:
- add derived state gl_fog_attrib::_Scale;
- add derived state gl_light::_CosCutoffNeg;

1 files changed, 732 insertions, 733 deletions

diff --git a/src/mesa/swrast/s_context.c b/src/mesa/swrast/s_context.c
index d8a7a6f0e63..84785ee50b7 100644
--- a/src/mesa/swrast/s_context.c
+++ b/src/mesa/swrast/s_context.c
@@ -1,733 +1,732 @@
-/*
- * Mesa 3-D graphics library
- * Version:  6.5
- *
- * Copyright (C) 1999-2005  Brian Paul   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.
- *
- * Authors:
- *    Keith Whitwell <[email protected]>
- *    Brian Paul
- */
-
-#include "imports.h"
-#include "bufferobj.h"
-#include "context.h"
-#include "colormac.h"
-#include "mtypes.h"
-#include "program.h"
-#include "swrast.h"
-#include "s_blend.h"
-#include "s_context.h"
-#include "s_lines.h"
-#include "s_points.h"
-#include "s_span.h"
-#include "s_triangle.h"
-#include "s_texfilter.h"
-
-
-/**
- * Recompute the value of swrast->_RasterMask, etc. according to
- * the current context.  The _RasterMask field can be easily tested by
- * drivers to determine certain basic GL state (does the primitive need
- * stenciling, logic-op, fog, etc?).
- */
-static void
-_swrast_update_rasterflags( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   GLbitfield rasterMask = 0;
-
-   if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
-   if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
-   if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
-   if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
-   if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
-   if (ctx->Stencil.Enabled)              rasterMask |= STENCIL_BIT;
-   if (ctx->Visual.rgbMode) {
-      const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
-      if (colorMask != 0xffffffff)        rasterMask |= MASKING_BIT;
-      if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
-      if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
-   }
-   else {
-      if (ctx->Color.IndexMask != 0xffffffff) rasterMask |= MASKING_BIT;
-      if (ctx->Color.IndexLogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
-   }
-
-   if (   ctx->Viewport.X < 0
-       || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
-       || ctx->Viewport.Y < 0
-       || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
-      rasterMask |= CLIP_BIT;
-   }
-
-   if (ctx->Query.CurrentOcclusionObject)
-      rasterMask |= OCCLUSION_BIT;
-
-
-   /* If we're not drawing to exactly one color buffer set the
-    * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
-    * buffers or the RGBA or CI mask disables all writes.
-    */
-   if (ctx->DrawBuffer->_NumColorDrawBuffers[0] != 1) {
-      /* more than one color buffer designated for writing (or zero buffers) */
-      rasterMask |= MULTI_DRAW_BIT;
-   }
-   else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
-      rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
-   }
-   else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
-      rasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
-   }
-
-   if (ctx->FragmentProgram._Active) {
-      rasterMask |= FRAGPROG_BIT;
-   }
-
-   if (ctx->ShaderObjects.CurrentProgram) {
-      /* XXX Vertex and/or fragment shader (what if no fragment shader??) */
-      rasterMask |= FRAGPROG_BIT;
-   }
-
-   if (ctx->ATIFragmentShader._Enabled) {
-      rasterMask |= ATIFRAGSHADER_BIT;
-   }
-
-#if CHAN_TYPE == GL_FLOAT
-   if (ctx->Color.ClampFragmentColor == GL_TRUE) {
-      rasterMask |= CLAMPING_BIT;
-   }
-#endif
-
-   SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
-}
-
-
-/**
- * Examine polycon culls tate to compute the _BackfaceSign field.
- * _BackfaceSign will be 0 if no culling, -1 if culling back-faces,
- * and 1 if culling front-faces.  The Polygon FrontFace state also
- * factors in.
- */
-static void
-_swrast_update_polygon( GLcontext *ctx )
-{
-   GLfloat backface_sign = 1;
-
-   if (ctx->Polygon.CullFlag) {
-      backface_sign = 1;
-      switch(ctx->Polygon.CullFaceMode) {
-      case GL_BACK:
-	 if(ctx->Polygon.FrontFace==GL_CCW)
-	    backface_sign = -1;
-	 break;
-      case GL_FRONT:
-	 if(ctx->Polygon.FrontFace!=GL_CCW)
-	    backface_sign = -1;
-	 break;
-      default:
-      case GL_FRONT_AND_BACK:
-	 backface_sign = 0;
-	 break;
-      }
-   }
-   else {
-      backface_sign = 0;
-   }
-
-   SWRAST_CONTEXT(ctx)->_BackfaceSign = backface_sign;
-}
-
-
-/**
- * Update the _PreferPixelFog field to indicate if we need to compute
- * fog factors per-fragment.
- */
-static void
-_swrast_update_fog_hint( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
-                              ctx->FragmentProgram._Enabled || /* not _Active! */
-			      (ctx->Hint.Fog == GL_NICEST &&
-			       swrast->AllowPixelFog));
-}
-
-
-
-/**
- * Update the swrast->_AnyTextureCombine flag.
- */
-static void
-_swrast_update_texture_env( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   GLuint i;
-   swrast->_AnyTextureCombine = GL_FALSE;
-   for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
-      if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
-          ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
-         swrast->_AnyTextureCombine = GL_TRUE;
-         return;
-      }
-   }
-}
-
-
-/**
- * Update swrast->_FogColor and swrast->_FogEnable values.
- */
-static void
-_swrast_update_fog_state( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
-   /* convert fog color to GLchan values */
-   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[RCOMP], ctx->Fog.Color[RCOMP]);
-   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[GCOMP], ctx->Fog.Color[GCOMP]);
-   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[BCOMP], ctx->Fog.Color[BCOMP]);
-
-   /* determine if fog is needed, and if so, which fog mode */
-   swrast->_FogEnabled = GL_FALSE;
-   if (ctx->FragmentProgram._Active) {
-      if (ctx->FragmentProgram._Current->Base.Target==GL_FRAGMENT_PROGRAM_ARB) {
-         const struct fragment_program *p
-            = (struct fragment_program *) ctx->FragmentProgram._Current;
-         if (p->FogOption != GL_NONE) {
-            swrast->_FogEnabled = GL_TRUE;
-            swrast->_FogMode = p->FogOption;
-         }
-      }
-   }
-   else if (ctx->Fog.Enabled) {
-      swrast->_FogEnabled = GL_TRUE;
-      swrast->_FogMode = ctx->Fog.Mode;
-   }
-}
-
-
-/**
- * Update state for running fragment programs.  Basically, load the
- * program parameters with current state values.
- */
-static void
-_swrast_update_fragment_program( GLcontext *ctx )
-{
-   if (ctx->FragmentProgram._Active) {
-      struct fragment_program *program = ctx->FragmentProgram._Current;
-      _mesa_load_state_parameters(ctx, program->Base.Parameters);
-   }
-}
-
-
-
-#define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |	\
-			     _NEW_TEXTURE |		\
-			     _NEW_HINT |		\
-			     _NEW_POLYGON )
-
-/* State referenced by _swrast_choose_triangle, _swrast_choose_line.
- */
-#define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |		\
-			      _NEW_RENDERMODE|			\
-                              _NEW_POLYGON|			\
-                              _NEW_DEPTH|			\
-                              _NEW_STENCIL|			\
-                              _NEW_COLOR|			\
-                              _NEW_TEXTURE|			\
-                              _SWRAST_NEW_RASTERMASK|		\
-                              _NEW_LIGHT|			\
-                              _NEW_FOG |			\
-			      _DD_NEW_SEPARATE_SPECULAR)
-
-#define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |		\
-			  _NEW_RENDERMODE|		\
-                          _NEW_LINE|			\
-                          _NEW_TEXTURE|			\
-                          _NEW_LIGHT|			\
-                          _NEW_FOG|			\
-                          _NEW_DEPTH |			\
-                          _DD_NEW_SEPARATE_SPECULAR)
-
-#define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |	\
-			   _NEW_RENDERMODE |		\
-			   _NEW_POINT |			\
-			   _NEW_TEXTURE |		\
-			   _NEW_LIGHT |			\
-			   _NEW_FOG |			\
-                           _DD_NEW_SEPARATE_SPECULAR)
-
-#define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
-
-#define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
-
-#define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
-
-
-
-/**
- * Stub for swrast->Triangle to select a true triangle function
- * after a state change.
- */
-static void
-_swrast_validate_triangle( GLcontext *ctx,
-			   const SWvertex *v0,
-                           const SWvertex *v1,
-                           const SWvertex *v2 )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
-   _swrast_validate_derived( ctx );
-   swrast->choose_triangle( ctx );
-
-   if (ctx->Texture._EnabledUnits == 0
-       && NEED_SECONDARY_COLOR(ctx)
-       && !ctx->FragmentProgram._Active) {
-      /* separate specular color, but no texture */
-      swrast->SpecTriangle = swrast->Triangle;
-      swrast->Triangle = _swrast_add_spec_terms_triangle;
-   }
-
-   swrast->Triangle( ctx, v0, v1, v2 );
-}
-
-/**
- * Called via swrast->Line.  Examine current GL state and choose a software
- * line routine.  Then call it.
- */
-static void
-_swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
-   _swrast_validate_derived( ctx );
-   swrast->choose_line( ctx );
-
-   if (ctx->Texture._EnabledUnits == 0
-       && NEED_SECONDARY_COLOR(ctx)
-       && !ctx->FragmentProgram._Active) {
-      swrast->SpecLine = swrast->Line;
-      swrast->Line = _swrast_add_spec_terms_line;
-   }
-
-
-   swrast->Line( ctx, v0, v1 );
-}
-
-/**
- * Called via swrast->Point.  Examine current GL state and choose a software
- * point routine.  Then call it.
- */
-static void
-_swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
-   _swrast_validate_derived( ctx );
-   swrast->choose_point( ctx );
-
-   if (ctx->Texture._EnabledUnits == 0
-       && NEED_SECONDARY_COLOR(ctx)
-       && !ctx->FragmentProgram._Active) {
-      swrast->SpecPoint = swrast->Point;
-      swrast->Point = _swrast_add_spec_terms_point;
-   }
-
-   swrast->Point( ctx, v0 );
-}
-
-
-/**
- * Called via swrast->BlendFunc.  Examine GL state to choose a blending
- * function, then call it.
- */
-static void _ASMAPI
-_swrast_validate_blend_func( GLcontext *ctx, GLuint n,
-			     const GLubyte mask[],
-			     GLchan src[][4],
-			     CONST GLchan dst[][4] )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
-   _swrast_validate_derived( ctx );
-   _swrast_choose_blend_func( ctx );
-
-   swrast->BlendFunc( ctx, n, mask, src, dst );
-}
-
-
-static void
-_swrast_sleep( GLcontext *ctx, GLbitfield new_state )
-{
-   (void) ctx; (void) new_state;
-}
-
-
-static void
-_swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   GLuint i;
-
-   swrast->NewState |= new_state;
-
-   /* After 10 statechanges without any swrast functions being called,
-    * put the module to sleep.
-    */
-   if (++swrast->StateChanges > 10) {
-      swrast->InvalidateState = _swrast_sleep;
-      swrast->NewState = ~0;
-      new_state = ~0;
-   }
-
-   if (new_state & swrast->InvalidateTriangleMask)
-      swrast->Triangle = _swrast_validate_triangle;
-
-   if (new_state & swrast->InvalidateLineMask)
-      swrast->Line = _swrast_validate_line;
-
-   if (new_state & swrast->InvalidatePointMask)
-      swrast->Point = _swrast_validate_point;
-
-   if (new_state & _SWRAST_NEW_BLEND_FUNC)
-      swrast->BlendFunc = _swrast_validate_blend_func;
-
-   if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
-      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
-	 swrast->TextureSample[i] = NULL;
-}
-
-
-static void
-_swrast_update_texture_samplers(GLcontext *ctx)
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   GLuint u;
-
-   for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
-      const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
-      if (tObj)
-         swrast->TextureSample[u] =
-            _swrast_choose_texture_sample_func(ctx, tObj);
-   }
-}
-
-
-void
-_swrast_validate_derived( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
-   if (swrast->NewState) {
-      if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
- 	 _swrast_update_rasterflags( ctx );
-
-      if (swrast->NewState & _NEW_POLYGON)
-	 _swrast_update_polygon( ctx );
-
-      if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
-	 _swrast_update_fog_hint( ctx );
-
-      if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
-	 _swrast_update_texture_env( ctx );
-
-      if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
-         _swrast_update_fog_state( ctx );
-
-      if (swrast->NewState & _NEW_PROGRAM)
-	 _swrast_update_fragment_program( ctx );
-
-      if (swrast->NewState & _NEW_TEXTURE)
-         _swrast_update_texture_samplers( ctx );
-
-      swrast->NewState = 0;
-      swrast->StateChanges = 0;
-      swrast->InvalidateState = _swrast_invalidate_state;
-   }
-}
-
-#define SWRAST_DEBUG 0
-
-/* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
- */
-void
-_swrast_Quad( GLcontext *ctx,
-	      const SWvertex *v0, const SWvertex *v1,
-              const SWvertex *v2, const SWvertex *v3 )
-{
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_Quad\n");
-      _swrast_print_vertex( ctx, v0 );
-      _swrast_print_vertex( ctx, v1 );
-      _swrast_print_vertex( ctx, v2 );
-      _swrast_print_vertex( ctx, v3 );
-   }
-   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
-   SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
-}
-
-void
-_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
-                  const SWvertex *v1, const SWvertex *v2 )
-{
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_Triangle\n");
-      _swrast_print_vertex( ctx, v0 );
-      _swrast_print_vertex( ctx, v1 );
-      _swrast_print_vertex( ctx, v2 );
-   }
-   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
-}
-
-void
-_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
-{
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_Line\n");
-      _swrast_print_vertex( ctx, v0 );
-      _swrast_print_vertex( ctx, v1 );
-   }
-   SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
-}
-
-void
-_swrast_Point( GLcontext *ctx, const SWvertex *v0 )
-{
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_Point\n");
-      _swrast_print_vertex( ctx, v0 );
-   }
-   SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
-}
-
-void
-_swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
-{
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_InvalidateState\n");
-   }
-   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
-}
-
-void
-_swrast_ResetLineStipple( GLcontext *ctx )
-{
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
-   }
-   SWRAST_CONTEXT(ctx)->StippleCounter = 0;
-}
-
-void
-_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
-{
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
-   }
-   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
-   SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
-}
-
-void
-_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
-{
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
-   }
-   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
-   SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
-}
-
-
-GLboolean
-_swrast_CreateContext( GLcontext *ctx )
-{
-   GLuint i;
-   SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
-
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_CreateContext\n");
-   }
-
-   if (!swrast)
-      return GL_FALSE;
-
-   swrast->NewState = ~0;
-
-   swrast->choose_point = _swrast_choose_point;
-   swrast->choose_line = _swrast_choose_line;
-   swrast->choose_triangle = _swrast_choose_triangle;
-
-   swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
-   swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
-   swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
-
-   swrast->Point = _swrast_validate_point;
-   swrast->Line = _swrast_validate_line;
-   swrast->Triangle = _swrast_validate_triangle;
-   swrast->InvalidateState = _swrast_sleep;
-   swrast->BlendFunc = _swrast_validate_blend_func;
-
-   swrast->AllowVertexFog = GL_TRUE;
-   swrast->AllowPixelFog = GL_TRUE;
-
-   /* Optimized Accum buffer */
-   swrast->_IntegerAccumMode = GL_FALSE;
-   swrast->_IntegerAccumScaler = 0.0;
-
-   for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
-      swrast->TextureSample[i] = NULL;
-
-   swrast->SpanArrays = MALLOC_STRUCT(span_arrays);
-   if (!swrast->SpanArrays) {
-      FREE(swrast);
-      return GL_FALSE;
-   }
-
-   /* init point span buffer */
-   swrast->PointSpan.primitive = GL_POINT;
-   swrast->PointSpan.start = 0;
-   swrast->PointSpan.end = 0;
-   swrast->PointSpan.facing = 0;
-   swrast->PointSpan.array = swrast->SpanArrays;
-
-   assert(ctx->Const.MaxTextureUnits > 0);
-   assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_UNITS);
-
-   swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureUnits *
-                                           MAX_WIDTH * 4 * sizeof(GLchan));
-   if (!swrast->TexelBuffer) {
-      FREE(swrast->SpanArrays);
-      FREE(swrast);
-      return GL_FALSE;
-   }
-
-   ctx->swrast_context = swrast;
-
-   return GL_TRUE;
-}
-
-void
-_swrast_DestroyContext( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
-   if (SWRAST_DEBUG) {
-      _mesa_debug(ctx, "_swrast_DestroyContext\n");
-   }
-
-   FREE( swrast->SpanArrays );
-   FREE( swrast->TexelBuffer );
-   FREE( swrast );
-
-   ctx->swrast_context = 0;
-}
-
-
-struct swrast_device_driver *
-_swrast_GetDeviceDriverReference( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   return &swrast->Driver;
-}
-
-void
-_swrast_flush( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   /* flush any pending fragments from rendering points */
-   if (swrast->PointSpan.end > 0) {
-      if (ctx->Visual.rgbMode) {
-         _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
-      }
-      else {
-         _swrast_write_index_span(ctx, &(swrast->PointSpan));
-      }
-      swrast->PointSpan.end = 0;
-   }
-}
-
-void
-_swrast_render_primitive( GLcontext *ctx, GLenum prim )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
-      _swrast_flush(ctx);
-   }
-   swrast->Primitive = prim;
-}
-
-
-void
-_swrast_render_start( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   if (swrast->Driver.SpanRenderStart)
-      swrast->Driver.SpanRenderStart( ctx );
-   swrast->PointSpan.end = 0;
-}
- 
-void
-_swrast_render_finish( GLcontext *ctx )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   if (swrast->Driver.SpanRenderFinish)
-      swrast->Driver.SpanRenderFinish( ctx );
-
-   _swrast_flush(ctx);
-}
-
-
-#define SWRAST_DEBUG_VERTICES 0
-
-void
-_swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
-{
-   GLuint i;
-
-   if (SWRAST_DEBUG_VERTICES) {
-      _mesa_debug(ctx, "win %f %f %f %f\n",
-                  v->win[0], v->win[1], v->win[2], v->win[3]);
-
-      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
-	 if (ctx->Texture.Unit[i]._ReallyEnabled)
-	    _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
-                        v->texcoord[i][0], v->texcoord[i][1],
-                        v->texcoord[i][2], v->texcoord[i][3]);
-
-#if CHAN_TYPE == GL_FLOAT
-      _mesa_debug(ctx, "color %f %f %f %f\n",
-                  v->color[0], v->color[1], v->color[2], v->color[3]);
-      _mesa_debug(ctx, "spec %f %f %f %f\n",
-                  v->specular[0], v->specular[1],
-                  v->specular[2], v->specular[3]);
-#else
-      _mesa_debug(ctx, "color %d %d %d %d\n",
-                  v->color[0], v->color[1], v->color[2], v->color[3]);
-      _mesa_debug(ctx, "spec %d %d %d %d\n",
-                  v->specular[0], v->specular[1],
-                  v->specular[2], v->specular[3]);
-#endif
-      _mesa_debug(ctx, "fog %f\n", v->fog);
-      _mesa_debug(ctx, "index %d\n", v->index);
-      _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
-      _mesa_debug(ctx, "\n");
-   }
-}
+/*

+ * Mesa 3-D graphics library

+ * Version:  6.5

+ *

+ * Copyright (C) 1999-2005  Brian Paul   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.

+ *

+ * Authors:

+ *    Keith Whitwell <[email protected]>

+ *    Brian Paul

+ */

+

+#include "imports.h"

+#include "bufferobj.h"

+#include "context.h"

+#include "colormac.h"

+#include "mtypes.h"

+#include "program.h"

+#include "swrast.h"

+#include "s_blend.h"

+#include "s_context.h"

+#include "s_lines.h"

+#include "s_points.h"

+#include "s_span.h"

+#include "s_triangle.h"

+#include "s_texfilter.h"

+

+

+/**

+ * Recompute the value of swrast->_RasterMask, etc. according to

+ * the current context.  The _RasterMask field can be easily tested by

+ * drivers to determine certain basic GL state (does the primitive need

+ * stenciling, logic-op, fog, etc?).

+ */

+static void

+_swrast_update_rasterflags( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   GLbitfield rasterMask = 0;

+

+   if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;

+   if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;

+   if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;

+   if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;

+   if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;

+   if (ctx->Stencil.Enabled)              rasterMask |= STENCIL_BIT;

+   if (ctx->Visual.rgbMode) {

+      const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);

+      if (colorMask != 0xffffffff)        rasterMask |= MASKING_BIT;

+      if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;

+      if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;

+   }

+   else {

+      if (ctx->Color.IndexMask != 0xffffffff) rasterMask |= MASKING_BIT;

+      if (ctx->Color.IndexLogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;

+   }

+

+   if (   ctx->Viewport.X < 0

+       || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width

+       || ctx->Viewport.Y < 0

+       || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {

+      rasterMask |= CLIP_BIT;

+   }

+

+   if (ctx->Query.CurrentOcclusionObject)

+      rasterMask |= OCCLUSION_BIT;

+

+

+   /* If we're not drawing to exactly one color buffer set the

+    * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no

+    * buffers or the RGBA or CI mask disables all writes.

+    */

+   if (ctx->DrawBuffer->_NumColorDrawBuffers[0] != 1) {

+      /* more than one color buffer designated for writing (or zero buffers) */

+      rasterMask |= MULTI_DRAW_BIT;

+   }

+   else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {

+      rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */

+   }

+   else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {

+      rasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */

+   }

+

+   if (ctx->FragmentProgram._Active) {

+      rasterMask |= FRAGPROG_BIT;

+   }

+

+   if (ctx->ShaderObjects._FragmentShaderPresent) {

+      rasterMask |= FRAGPROG_BIT;

+   }

+

+   if (ctx->ATIFragmentShader._Enabled) {

+      rasterMask |= ATIFRAGSHADER_BIT;

+   }

+

+#if CHAN_TYPE == GL_FLOAT

+   if (ctx->Color.ClampFragmentColor == GL_TRUE) {

+      rasterMask |= CLAMPING_BIT;

+   }

+#endif

+

+   SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;

+}

+

+

+/**

+ * Examine polycon culls tate to compute the _BackfaceSign field.

+ * _BackfaceSign will be 0 if no culling, -1 if culling back-faces,

+ * and 1 if culling front-faces.  The Polygon FrontFace state also

+ * factors in.

+ */

+static void

+_swrast_update_polygon( GLcontext *ctx )

+{

+   GLfloat backface_sign = 1;

+

+   if (ctx->Polygon.CullFlag) {

+      backface_sign = 1;

+      switch(ctx->Polygon.CullFaceMode) {

+      case GL_BACK:

+	 if(ctx->Polygon.FrontFace==GL_CCW)

+	    backface_sign = -1;

+	 break;

+      case GL_FRONT:

+	 if(ctx->Polygon.FrontFace!=GL_CCW)

+	    backface_sign = -1;

+	 break;

+      default:

+      case GL_FRONT_AND_BACK:

+	 backface_sign = 0;

+	 break;

+      }

+   }

+   else {

+      backface_sign = 0;

+   }

+

+   SWRAST_CONTEXT(ctx)->_BackfaceSign = backface_sign;

+}

+

+

+/**

+ * Update the _PreferPixelFog field to indicate if we need to compute

+ * fog factors per-fragment.

+ */

+static void

+_swrast_update_fog_hint( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||

+                              ctx->FragmentProgram._Enabled || /* not _Active! */

+			      (ctx->Hint.Fog == GL_NICEST &&

+			       swrast->AllowPixelFog));

+}

+

+

+

+/**

+ * Update the swrast->_AnyTextureCombine flag.

+ */

+static void

+_swrast_update_texture_env( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   GLuint i;

+   swrast->_AnyTextureCombine = GL_FALSE;

+   for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {

+      if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||

+          ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {

+         swrast->_AnyTextureCombine = GL_TRUE;

+         return;

+      }

+   }

+}

+

+

+/**

+ * Update swrast->_FogColor and swrast->_FogEnable values.

+ */

+static void

+_swrast_update_fog_state( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+

+   /* convert fog color to GLchan values */

+   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[RCOMP], ctx->Fog.Color[RCOMP]);

+   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[GCOMP], ctx->Fog.Color[GCOMP]);

+   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[BCOMP], ctx->Fog.Color[BCOMP]);

+

+   /* determine if fog is needed, and if so, which fog mode */

+   swrast->_FogEnabled = GL_FALSE;

+   if (ctx->FragmentProgram._Active) {

+      if (ctx->FragmentProgram._Current->Base.Target==GL_FRAGMENT_PROGRAM_ARB) {

+         const struct fragment_program *p

+            = (struct fragment_program *) ctx->FragmentProgram._Current;

+         if (p->FogOption != GL_NONE) {

+            swrast->_FogEnabled = GL_TRUE;

+            swrast->_FogMode = p->FogOption;

+         }

+      }

+   }

+   else if (ctx->Fog.Enabled) {

+      swrast->_FogEnabled = GL_TRUE;

+      swrast->_FogMode = ctx->Fog.Mode;

+   }

+}

+

+

+/**

+ * Update state for running fragment programs.  Basically, load the

+ * program parameters with current state values.

+ */

+static void

+_swrast_update_fragment_program( GLcontext *ctx )

+{

+   if (ctx->FragmentProgram._Active) {

+      struct fragment_program *program = ctx->FragmentProgram._Current;

+      _mesa_load_state_parameters(ctx, program->Base.Parameters);

+   }

+}

+

+

+

+#define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |	\

+			     _NEW_TEXTURE |		\

+			     _NEW_HINT |		\

+			     _NEW_POLYGON )

+

+/* State referenced by _swrast_choose_triangle, _swrast_choose_line.

+ */

+#define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |		\

+			      _NEW_RENDERMODE|			\

+                              _NEW_POLYGON|			\

+                              _NEW_DEPTH|			\

+                              _NEW_STENCIL|			\

+                              _NEW_COLOR|			\

+                              _NEW_TEXTURE|			\

+                              _SWRAST_NEW_RASTERMASK|		\

+                              _NEW_LIGHT|			\

+                              _NEW_FOG |			\

+			      _DD_NEW_SEPARATE_SPECULAR)

+

+#define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |		\

+			  _NEW_RENDERMODE|		\

+                          _NEW_LINE|			\

+                          _NEW_TEXTURE|			\

+                          _NEW_LIGHT|			\

+                          _NEW_FOG|			\

+                          _NEW_DEPTH |			\

+                          _DD_NEW_SEPARATE_SPECULAR)

+

+#define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |	\

+			   _NEW_RENDERMODE |		\

+			   _NEW_POINT |			\

+			   _NEW_TEXTURE |		\

+			   _NEW_LIGHT |			\

+			   _NEW_FOG |			\

+                           _DD_NEW_SEPARATE_SPECULAR)

+

+#define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE

+

+#define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE

+

+#define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR

+

+

+

+/**

+ * Stub for swrast->Triangle to select a true triangle function

+ * after a state change.

+ */

+static void

+_swrast_validate_triangle( GLcontext *ctx,

+			   const SWvertex *v0,

+                           const SWvertex *v1,

+                           const SWvertex *v2 )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+

+   _swrast_validate_derived( ctx );

+   swrast->choose_triangle( ctx );

+

+   if (ctx->Texture._EnabledUnits == 0

+       && NEED_SECONDARY_COLOR(ctx)

+       && !ctx->FragmentProgram._Active) {

+      /* separate specular color, but no texture */

+      swrast->SpecTriangle = swrast->Triangle;

+      swrast->Triangle = _swrast_add_spec_terms_triangle;

+   }

+

+   swrast->Triangle( ctx, v0, v1, v2 );

+}

+

+/**

+ * Called via swrast->Line.  Examine current GL state and choose a software

+ * line routine.  Then call it.

+ */

+static void

+_swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+

+   _swrast_validate_derived( ctx );

+   swrast->choose_line( ctx );

+

+   if (ctx->Texture._EnabledUnits == 0

+       && NEED_SECONDARY_COLOR(ctx)

+       && !ctx->FragmentProgram._Active) {

+      swrast->SpecLine = swrast->Line;

+      swrast->Line = _swrast_add_spec_terms_line;

+   }

+

+

+   swrast->Line( ctx, v0, v1 );

+}

+

+/**

+ * Called via swrast->Point.  Examine current GL state and choose a software

+ * point routine.  Then call it.

+ */

+static void

+_swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+

+   _swrast_validate_derived( ctx );

+   swrast->choose_point( ctx );

+

+   if (ctx->Texture._EnabledUnits == 0

+       && NEED_SECONDARY_COLOR(ctx)

+       && !ctx->FragmentProgram._Active) {

+      swrast->SpecPoint = swrast->Point;

+      swrast->Point = _swrast_add_spec_terms_point;

+   }

+

+   swrast->Point( ctx, v0 );

+}

+

+

+/**

+ * Called via swrast->BlendFunc.  Examine GL state to choose a blending

+ * function, then call it.

+ */

+static void _ASMAPI

+_swrast_validate_blend_func( GLcontext *ctx, GLuint n,

+			     const GLubyte mask[],

+			     GLchan src[][4],

+			     CONST GLchan dst[][4] )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+

+   _swrast_validate_derived( ctx );

+   _swrast_choose_blend_func( ctx );

+

+   swrast->BlendFunc( ctx, n, mask, src, dst );

+}

+

+

+static void

+_swrast_sleep( GLcontext *ctx, GLbitfield new_state )

+{

+   (void) ctx; (void) new_state;

+}

+

+

+static void

+_swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   GLuint i;

+

+   swrast->NewState |= new_state;

+

+   /* After 10 statechanges without any swrast functions being called,

+    * put the module to sleep.

+    */

+   if (++swrast->StateChanges > 10) {

+      swrast->InvalidateState = _swrast_sleep;

+      swrast->NewState = ~0;

+      new_state = ~0;

+   }

+

+   if (new_state & swrast->InvalidateTriangleMask)

+      swrast->Triangle = _swrast_validate_triangle;

+

+   if (new_state & swrast->InvalidateLineMask)

+      swrast->Line = _swrast_validate_line;

+

+   if (new_state & swrast->InvalidatePointMask)

+      swrast->Point = _swrast_validate_point;

+

+   if (new_state & _SWRAST_NEW_BLEND_FUNC)

+      swrast->BlendFunc = _swrast_validate_blend_func;

+

+   if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)

+      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)

+	 swrast->TextureSample[i] = NULL;

+}

+

+

+static void

+_swrast_update_texture_samplers(GLcontext *ctx)

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   GLuint u;

+

+   for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {

+      const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;

+      if (tObj)

+         swrast->TextureSample[u] =

+            _swrast_choose_texture_sample_func(ctx, tObj);

+   }

+}

+

+

+void

+_swrast_validate_derived( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+

+   if (swrast->NewState) {

+      if (swrast->NewState & _SWRAST_NEW_RASTERMASK)

+ 	 _swrast_update_rasterflags( ctx );

+

+      if (swrast->NewState & _NEW_POLYGON)

+	 _swrast_update_polygon( ctx );

+

+      if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))

+	 _swrast_update_fog_hint( ctx );

+

+      if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)

+	 _swrast_update_texture_env( ctx );

+

+      if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))

+         _swrast_update_fog_state( ctx );

+

+      if (swrast->NewState & _NEW_PROGRAM)

+	 _swrast_update_fragment_program( ctx );

+

+      if (swrast->NewState & _NEW_TEXTURE)

+         _swrast_update_texture_samplers( ctx );

+

+      swrast->NewState = 0;

+      swrast->StateChanges = 0;

+      swrast->InvalidateState = _swrast_invalidate_state;

+   }

+}

+

+#define SWRAST_DEBUG 0

+

+/* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.

+ */

+void

+_swrast_Quad( GLcontext *ctx,

+	      const SWvertex *v0, const SWvertex *v1,

+              const SWvertex *v2, const SWvertex *v3 )

+{

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_Quad\n");

+      _swrast_print_vertex( ctx, v0 );

+      _swrast_print_vertex( ctx, v1 );

+      _swrast_print_vertex( ctx, v2 );

+      _swrast_print_vertex( ctx, v3 );

+   }

+   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );

+   SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );

+}

+

+void

+_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,

+                  const SWvertex *v1, const SWvertex *v2 )

+{

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_Triangle\n");

+      _swrast_print_vertex( ctx, v0 );

+      _swrast_print_vertex( ctx, v1 );

+      _swrast_print_vertex( ctx, v2 );

+   }

+   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );

+}

+

+void

+_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )

+{

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_Line\n");

+      _swrast_print_vertex( ctx, v0 );

+      _swrast_print_vertex( ctx, v1 );

+   }

+   SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );

+}

+

+void

+_swrast_Point( GLcontext *ctx, const SWvertex *v0 )

+{

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_Point\n");

+      _swrast_print_vertex( ctx, v0 );

+   }

+   SWRAST_CONTEXT(ctx)->Point( ctx, v0 );

+}

+

+void

+_swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )

+{

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_InvalidateState\n");

+   }

+   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );

+}

+

+void

+_swrast_ResetLineStipple( GLcontext *ctx )

+{

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_ResetLineStipple\n");

+   }

+   SWRAST_CONTEXT(ctx)->StippleCounter = 0;

+}

+

+void

+_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )

+{

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);

+   }

+   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );

+   SWRAST_CONTEXT(ctx)->AllowVertexFog = value;

+}

+

+void

+_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )

+{

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);

+   }

+   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );

+   SWRAST_CONTEXT(ctx)->AllowPixelFog = value;

+}

+

+

+GLboolean

+_swrast_CreateContext( GLcontext *ctx )

+{

+   GLuint i;

+   SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));

+

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_CreateContext\n");

+   }

+

+   if (!swrast)

+      return GL_FALSE;

+

+   swrast->NewState = ~0;

+

+   swrast->choose_point = _swrast_choose_point;

+   swrast->choose_line = _swrast_choose_line;

+   swrast->choose_triangle = _swrast_choose_triangle;

+

+   swrast->InvalidatePointMask = _SWRAST_NEW_POINT;

+   swrast->InvalidateLineMask = _SWRAST_NEW_LINE;

+   swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;

+

+   swrast->Point = _swrast_validate_point;

+   swrast->Line = _swrast_validate_line;

+   swrast->Triangle = _swrast_validate_triangle;

+   swrast->InvalidateState = _swrast_sleep;

+   swrast->BlendFunc = _swrast_validate_blend_func;

+

+   swrast->AllowVertexFog = GL_TRUE;

+   swrast->AllowPixelFog = GL_TRUE;

+

+   /* Optimized Accum buffer */

+   swrast->_IntegerAccumMode = GL_FALSE;

+   swrast->_IntegerAccumScaler = 0.0;

+

+   for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)

+      swrast->TextureSample[i] = NULL;

+

+   swrast->SpanArrays = MALLOC_STRUCT(span_arrays);

+   if (!swrast->SpanArrays) {

+      FREE(swrast);

+      return GL_FALSE;

+   }

+

+   /* init point span buffer */

+   swrast->PointSpan.primitive = GL_POINT;

+   swrast->PointSpan.start = 0;

+   swrast->PointSpan.end = 0;

+   swrast->PointSpan.facing = 0;

+   swrast->PointSpan.array = swrast->SpanArrays;

+

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

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

+

+   swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureUnits *

+                                           MAX_WIDTH * 4 * sizeof(GLchan));

+   if (!swrast->TexelBuffer) {

+      FREE(swrast->SpanArrays);

+      FREE(swrast);

+      return GL_FALSE;

+   }

+

+   ctx->swrast_context = swrast;

+

+   return GL_TRUE;

+}

+

+void

+_swrast_DestroyContext( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+

+   if (SWRAST_DEBUG) {

+      _mesa_debug(ctx, "_swrast_DestroyContext\n");

+   }

+

+   FREE( swrast->SpanArrays );

+   FREE( swrast->TexelBuffer );

+   FREE( swrast );

+

+   ctx->swrast_context = 0;

+}

+

+

+struct swrast_device_driver *

+_swrast_GetDeviceDriverReference( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   return &swrast->Driver;

+}

+

+void

+_swrast_flush( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   /* flush any pending fragments from rendering points */

+   if (swrast->PointSpan.end > 0) {

+      if (ctx->Visual.rgbMode) {

+         _swrast_write_rgba_span(ctx, &(swrast->PointSpan));

+      }

+      else {

+         _swrast_write_index_span(ctx, &(swrast->PointSpan));

+      }

+      swrast->PointSpan.end = 0;

+   }

+}

+

+void

+_swrast_render_primitive( GLcontext *ctx, GLenum prim )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {

+      _swrast_flush(ctx);

+   }

+   swrast->Primitive = prim;

+}

+

+

+void

+_swrast_render_start( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   if (swrast->Driver.SpanRenderStart)

+      swrast->Driver.SpanRenderStart( ctx );

+   swrast->PointSpan.end = 0;

+}

+ 

+void

+_swrast_render_finish( GLcontext *ctx )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   if (swrast->Driver.SpanRenderFinish)

+      swrast->Driver.SpanRenderFinish( ctx );

+

+   _swrast_flush(ctx);

+}

+

+

+#define SWRAST_DEBUG_VERTICES 0

+

+void

+_swrast_print_vertex( GLcontext *ctx, const SWvertex *v )

+{

+   GLuint i;

+

+   if (SWRAST_DEBUG_VERTICES) {

+      _mesa_debug(ctx, "win %f %f %f %f\n",

+                  v->win[0], v->win[1], v->win[2], v->win[3]);

+

+      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)

+	 if (ctx->Texture.Unit[i]._ReallyEnabled)

+	    _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,

+                        v->texcoord[i][0], v->texcoord[i][1],

+                        v->texcoord[i][2], v->texcoord[i][3]);

+

+#if CHAN_TYPE == GL_FLOAT

+      _mesa_debug(ctx, "color %f %f %f %f\n",

+                  v->color[0], v->color[1], v->color[2], v->color[3]);

+      _mesa_debug(ctx, "spec %f %f %f %f\n",

+                  v->specular[0], v->specular[1],

+                  v->specular[2], v->specular[3]);

+#else

+      _mesa_debug(ctx, "color %d %d %d %d\n",

+                  v->color[0], v->color[1], v->color[2], v->color[3]);

+      _mesa_debug(ctx, "spec %d %d %d %d\n",

+                  v->specular[0], v->specular[1],

+                  v->specular[2], v->specular[3]);

+#endif

+      _mesa_debug(ctx, "fog %f\n", v->fog);

+      _mesa_debug(ctx, "index %d\n", v->index);

+      _mesa_debug(ctx, "pointsize %f\n", v->pointSize);

+      _mesa_debug(ctx, "\n");

+   }

+}