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/*

 * Mesa 3-D graphics library

 * Version:  7.1

 *

 * Copyright (C) 1999-2008  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 

 *    Brian Paul

 */

#include "main/imports.h"

#include "main/bufferobj.h"

#include "main/colormac.h"

#include "main/mtypes.h"

#include "main/teximage.h"

#include "program/prog_parameter.h"

#include "program/prog_statevars.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( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   GLbitfield rasterMask = 0;

   GLuint i;

   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;

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

      if (!ctx->Color.ColorMask[i][0] ||

          !ctx->Color.ColorMask[i][1] ||

          !ctx->Color.ColorMask[i][2] ||

          !ctx->Color.ColorMask[i][3]) {

         rasterMask |= MASKING_BIT;

         break;

      }

   }

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

   if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_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 != 1) {

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

      rasterMask |= MULTI_DRAW_BIT;

   }

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

      if (ctx->Color.ColorMask[i][0] +

          ctx->Color.ColorMask[i][1] +

          ctx->Color.ColorMask[i][2] +

          ctx->Color.ColorMask[i][3] == 0) {

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

         break;

      }

   }

   if (ctx->FragmentProgram._Current) {

      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 polygon cull state to compute the _BackfaceCullSign field.

 * _BackfaceCullSign 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( struct gl_context *ctx )

{

   GLfloat backface_sign;

   if (ctx->Polygon.CullFlag) {

      switch (ctx->Polygon.CullFaceMode) {

      case GL_BACK:

         backface_sign = -1.0F;

	 break;

      case GL_FRONT:

         backface_sign = 1.0F;

	 break;

      case GL_FRONT_AND_BACK:

         /* fallthrough */

      default:

	 backface_sign = 0.0F;

      }

   }

   else {

      backface_sign = 0.0F;

   }

   SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;

   /* This is for front/back-face determination, but not for culling */

   SWRAST_CONTEXT(ctx)->_BackfaceSign

      = (ctx->Polygon.FrontFace == GL_CW) ? -1.0F : 1.0F;

}

/**

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

 * fog blend factors (from the fog coords) per-fragment.

 */

static void

_swrast_update_fog_hint( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

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

                              ctx->FragmentProgram._Current ||

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

			       swrast->AllowPixelFog));

}

/**

 * Update the swrast->_TextureCombinePrimary flag.

 */

static void

_swrast_update_texture_env( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   GLuint i;

   swrast->_TextureCombinePrimary = GL_FALSE;

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

      const struct gl_tex_env_combine_state *combine =

         ctx->Texture.Unit[i]._CurrentCombine;

      GLuint term;

      for (term = 0; term < combine->_NumArgsRGB; term++) {

         if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {

            swrast->_TextureCombinePrimary = GL_TRUE;

            return;

         }

         if (combine->SourceA[term] == GL_PRIMARY_COLOR) {

            swrast->_TextureCombinePrimary = GL_TRUE;

            return;

         }

      }

   }

}

/**

 * Determine if we can defer texturing/shading until after Z/stencil

 * testing.  This potentially allows us to skip texturing/shading for

 * lots of fragments.

 */

static void

_swrast_update_deferred_texture(struct gl_context *ctx)

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   if (ctx->Color.AlphaEnabled) {

      /* alpha test depends on post-texture/shader colors */

      swrast->_DeferredTexture = GL_FALSE;

   }

   else {

      const struct gl_fragment_program *fprog

         = ctx->FragmentProgram._Current;

      if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {

         /* Z comes from fragment program/shader */

         swrast->_DeferredTexture = GL_FALSE;

      }

      else if (fprog && fprog->UsesKill) {

         swrast->_DeferredTexture = GL_FALSE;

      }

      else if (ctx->Query.CurrentOcclusionObject) {

         /* occlusion query depends on shader discard/kill results */

         swrast->_DeferredTexture = GL_FALSE;

      }

      else {

         swrast->_DeferredTexture = GL_TRUE;

      }

   }

}

/**

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

 */

static void

_swrast_update_fog_state( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;

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

   swrast->_FogEnabled = GL_FALSE;

   if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {

      if (fp->FogOption != GL_NONE) {

         swrast->_FogEnabled = GL_TRUE;

         swrast->_FogMode = fp->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(struct gl_context *ctx, GLbitfield newState)

{

   const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;

   if (fp) {

      _mesa_load_state_parameters(ctx, fp->Base.Parameters);

   }

}

/**

 * See if we can do early diffuse+specular (primary+secondary) color

 * add per vertex instead of per-fragment.

 */

static void

_swrast_update_specular_vertex_add(struct gl_context *ctx)

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||

      (ctx->Light.Enabled &&

       ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);

   swrast->SpecularVertexAdd = (separateSpecular

                                && ctx->Texture._EnabledUnits == 0x0

                                && !ctx->FragmentProgram._Current

                                && !ctx->ATIFragmentShader._Enabled);

}

#define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |	\

                             _NEW_PROGRAM_CONSTANTS |   \

			     _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( struct gl_context *ctx,

			   const SWvertex *v0,

                           const SWvertex *v1,

                           const SWvertex *v2 )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   _swrast_validate_derived( ctx );

   swrast->choose_triangle( ctx );

   ASSERT(swrast->Triangle);

   if (swrast->SpecularVertexAdd) {

      /* 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( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   _swrast_validate_derived( ctx );

   swrast->choose_line( ctx );

   ASSERT(swrast->Line);

   if (swrast->SpecularVertexAdd) {

      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( struct gl_context *ctx, const SWvertex *v0 )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   _swrast_validate_derived( ctx );

   swrast->choose_point( ctx );

   if (swrast->SpecularVertexAdd) {

      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(struct gl_context *ctx, GLuint n, const GLubyte mask[],

                            GLvoid *src, const GLvoid *dst,

                            GLenum chanType )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   _swrast_validate_derived( ctx ); /* why is this needed? */

   _swrast_choose_blend_func( ctx, chanType );

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

}

/**

 * Make sure we have texture image data for all the textures we may need

 * for subsequent rendering.

 */

static void

_swrast_validate_texture_images(struct gl_context *ctx)

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   GLuint u;

   if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {

      /* no textures enabled, or no way to validate images! */

      return;

   }

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

      if (ctx->Texture.Unit[u]._ReallyEnabled) {

         struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;

         ASSERT(texObj);

         if (texObj) {

            GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;

            GLuint face;

            for (face = 0; face < numFaces; face++) {

               GLint lvl;

               for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {

                  struct gl_texture_image *texImg = texObj->Image[face][lvl];

                  if (texImg && !texImg->Data) {

                     swrast->ValidateTextureImage(ctx, texObj, face, lvl);

                     ASSERT(texObj->Image[face][lvl]->Data);

                  }

               }

            }

         }

      }

   }

}

/**

 * Free the texture image data attached to all currently enabled

 * textures.  Meant to be called by device drivers when transitioning

 * from software to hardware rendering.

 */

void

_swrast_eject_texture_images(struct gl_context *ctx)

{

   GLuint u;

   if (!ctx->Texture._EnabledUnits) {

      /* no textures enabled */

      return;

   }

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

      if (ctx->Texture.Unit[u]._ReallyEnabled) {

         struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;

         ASSERT(texObj);

         if (texObj) {

            GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;

            GLuint face;

            for (face = 0; face < numFaces; face++) {

               GLint lvl;

               for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {

                  struct gl_texture_image *texImg = texObj->Image[face][lvl];

                  if (texImg && texImg->Data) {

                     _mesa_free_texmemory(texImg->Data);

                     texImg->Data = NULL;

                  }

               }

            }

         }

      }

   }

}

static void

_swrast_sleep( struct gl_context *ctx, GLbitfield new_state )

{

   (void) ctx; (void) new_state;

}

static void

_swrast_invalidate_state( struct gl_context *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.MaxTextureImageUnits ; i++)

	 swrast->TextureSample[i] = NULL;

}

void

_swrast_update_texture_samplers(struct gl_context *ctx)

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   GLuint u;

   if (!swrast)

      return; /* pipe hack */

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

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

      /* Note: If tObj is NULL, the sample function will be a simple

       * function that just returns opaque black (0,0,0,1).

       */

      swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);

   }

}

/**

 * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,

 * swrast->_ActiveAtttribMask.

 */

static void

_swrast_update_active_attribs(struct gl_context *ctx)

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   GLuint attribsMask;

   /*

    * Compute _ActiveAttribsMask = which fragment attributes are needed.

    */

   if (ctx->FragmentProgram._Current) {

      /* fragment program/shader */

      attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;

      attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */

   }

   else if (ctx->ATIFragmentShader._Enabled) {

      attribsMask = ~0;  /* XXX fix me */

   }

   else {

      /* fixed function */

      attribsMask = 0x0;

#if CHAN_TYPE == GL_FLOAT

      attribsMask |= FRAG_BIT_COL0;

#endif

      if (ctx->Fog.ColorSumEnabled ||

          (ctx->Light.Enabled &&

           ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {

         attribsMask |= FRAG_BIT_COL1;

      }

      if (swrast->_FogEnabled)

         attribsMask |= FRAG_BIT_FOGC;

      attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);

   }

   swrast->_ActiveAttribMask = attribsMask;

   /* Update _ActiveAttribs[] list */

   {

      GLuint i, num = 0;

      for (i = 0; i < FRAG_ATTRIB_MAX; i++) {

         if (attribsMask & (1 << i)) {

            swrast->_ActiveAttribs[num++] = i;

            /* how should this attribute be interpolated? */

            if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)

               swrast->_InterpMode[i] = ctx->Light.ShadeModel;

            else

               swrast->_InterpMode[i] = GL_SMOOTH;

         }

      }

      swrast->_NumActiveAttribs = num;

   }

}

void

_swrast_validate_derived( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   if (swrast->NewState) {

      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_CONSTANTS | _NEW_PROGRAM))

	 _swrast_update_fragment_program( ctx, swrast->NewState );

      if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {

         _swrast_update_texture_samplers( ctx );

         _swrast_validate_texture_images(ctx);

      }

      if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))

         _swrast_update_deferred_texture(ctx);

      if (swrast->NewState & _SWRAST_NEW_RASTERMASK)

 	 _swrast_update_rasterflags( ctx );

      if (swrast->NewState & (_NEW_DEPTH |

                              _NEW_FOG |

                              _NEW_LIGHT |

                              _NEW_PROGRAM |

                              _NEW_TEXTURE))

         _swrast_update_active_attribs(ctx);

      if (swrast->NewState & (_NEW_FOG |

                              _NEW_PROGRAM |

                              _NEW_LIGHT |

                              _NEW_TEXTURE))

         _swrast_update_specular_vertex_add(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( struct gl_context *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( struct gl_context *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( struct gl_context *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( struct gl_context *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( struct gl_context *ctx, GLbitfield new_state )

{

   if (SWRAST_DEBUG) {

      _mesa_debug(ctx, "_swrast_InvalidateState\n");

   }

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

}

void

_swrast_ResetLineStipple( struct gl_context *ctx )

{

   if (SWRAST_DEBUG) {

      _mesa_debug(ctx, "_swrast_ResetLineStipple\n");

   }

   SWRAST_CONTEXT(ctx)->StippleCounter = 0;

}

void

_swrast_SetFacing(struct gl_context *ctx, GLuint facing)

{

   SWRAST_CONTEXT(ctx)->PointLineFacing = facing;

}

void

_swrast_allow_vertex_fog( struct gl_context *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( struct gl_context *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( struct gl_context *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(sw_span_arrays);

   if (!swrast->SpanArrays) {

      FREE(swrast);

      return GL_FALSE;

   }

   swrast->SpanArrays->ChanType = CHAN_TYPE;

#if CHAN_TYPE == GL_UNSIGNED_BYTE

   swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;

#elif CHAN_TYPE == GL_UNSIGNED_SHORT

   swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;

#else

   swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];

#endif

   /* init point span buffer */

   swrast->PointSpan.primitive = GL_POINT;

   swrast->PointSpan.end = 0;

   swrast->PointSpan.facing = 0;

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

   swrast->TexelBuffer = (GLfloat *) MALLOC(ctx->Const.MaxTextureImageUnits *

                                           MAX_WIDTH * 4 * sizeof(GLfloat));

   if (!swrast->TexelBuffer) {

      FREE(swrast->SpanArrays);

      FREE(swrast);

      return GL_FALSE;

   }

   ctx->swrast_context = swrast;

   return GL_TRUE;

}

void

_swrast_DestroyContext( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   if (SWRAST_DEBUG) {

      _mesa_debug(ctx, "_swrast_DestroyContext\n");

   }

   FREE( swrast->SpanArrays );

   if (swrast->ZoomedArrays)

      FREE( swrast->ZoomedArrays );

   FREE( swrast->TexelBuffer );

   FREE( swrast );

   ctx->swrast_context = 0;

}

struct swrast_device_driver *

_swrast_GetDeviceDriverReference( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   return &swrast->Driver;

}

void

_swrast_flush( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   /* flush any pending fragments from rendering points */

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

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

      swrast->PointSpan.end = 0;

   }

}

void

_swrast_render_primitive( struct gl_context *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( struct gl_context *ctx )

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   if (swrast->Driver.SpanRenderStart)

      swrast->Driver.SpanRenderStart( ctx );

   swrast->PointSpan.end = 0;

}

void

_swrast_render_finish( struct gl_context *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( struct gl_context *ctx, const SWvertex *v )

{

   GLuint i;

   if (SWRAST_DEBUG_VERTICES) {

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

                  v->attrib[FRAG_ATTRIB_WPOS][0],

                  v->attrib[FRAG_ATTRIB_WPOS][1],

                  v->attrib[FRAG_ATTRIB_WPOS][2],

                  v->attrib[FRAG_ATTRIB_WPOS][3]);

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

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

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

                        v->attrib[FRAG_ATTRIB_TEX0 + i][0],

                        v->attrib[FRAG_ATTRIB_TEX0 + i][1],

                        v->attrib[FRAG_ATTRIB_TEX0 + i][2],

                        v->attrib[FRAG_ATTRIB_TEX0 + 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]);

#else

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

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

#endif

      _mesa_debug(ctx, "spec %g %g %g %g\n",

                  v->attrib[FRAG_ATTRIB_COL1][0],

                  v->attrib[FRAG_ATTRIB_COL1][1],

                  v->attrib[FRAG_ATTRIB_COL1][2],

                  v->attrib[FRAG_ATTRIB_COL1][3]);

      _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);

      _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);

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

      _mesa_debug(ctx, "\n");

   }

}