s_context.h

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/*
 * Mesa 3-D graphics library
 * Version:  6.5.3
 *
 * Copyright (C) 1999-2007  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.
 */


#ifndef S_CONTEXT_H
#define S_CONTEXT_H

#include "main/mtypes.h"
#include "shader/prog_execute.h"
#include "swrast.h"
#include "s_span.h"


typedef void (*texture_sample_func)(GLcontext *ctx,
                                    const struct gl_texture_object *tObj,
                                    GLuint n, const GLfloat texcoords[][4],
                                    const GLfloat lambda[], GLchan rgba[][4]);

typedef void (_ASMAPIP blend_func)( GLcontext *ctx, GLuint n,
                                    const GLubyte mask[],
                                    GLvoid *src, const GLvoid *dst,
                                    GLenum chanType);

typedef void (*swrast_point_func)( GLcontext *ctx, const SWvertex *);

typedef void (*swrast_line_func)( GLcontext *ctx,
                                  const SWvertex *, const SWvertex *);

typedef void (*swrast_tri_func)( GLcontext *ctx, const SWvertex *,
                                 const SWvertex *, const SWvertex *);


typedef void (*validate_texture_image_func)(GLcontext *ctx,
                                            struct gl_texture_object *texObj,
                                            GLuint face, GLuint level);


#define ALPHATEST_BIT       0x001   
#define BLEND_BIT       0x002   
#define DEPTH_BIT       0x004   
#define FOG_BIT         0x008   
#define LOGIC_OP_BIT        0x010   
#define CLIP_BIT        0x020   
#define STENCIL_BIT     0x040   
#define MASKING_BIT     0x080   
#define MULTI_DRAW_BIT      0x400   
#define OCCLUSION_BIT           0x800   
#define TEXTURE_BIT     0x1000  
#define FRAGPROG_BIT            0x2000  
#define ATIFRAGSHADER_BIT       0x4000  
#define CLAMPING_BIT            0x8000  

#define _SWRAST_NEW_RASTERMASK (_NEW_BUFFERS|   \
                    _NEW_SCISSOR|   \
                    _NEW_COLOR| \
                    _NEW_DEPTH| \
                    _NEW_FOG|   \
                                _NEW_PROGRAM|   \
                    _NEW_STENCIL|   \
                    _NEW_TEXTURE|   \
                    _NEW_VIEWPORT|  \
                    _NEW_DEPTH)


typedef struct
{
   struct swrast_device_driver Driver;

   GLboolean AllowVertexFog;
   GLboolean AllowPixelFog;

   GLbitfield _RasterMask;
   GLfloat _BackfaceSign;      
   GLfloat _BackfaceCullSign;  
   GLboolean _PreferPixelFog;    /* Compute fog blend factor per fragment? */
   GLboolean _AnyTextureCombine;
   GLboolean _FogEnabled;
   GLboolean _DeferredTexture;
   GLenum _FogMode;  /* either GL_FOG_MODE or fragment program's fog mode */

   GLuint _ActiveAttribs[FRAG_ATTRIB_MAX];
   GLbitfield _ActiveAttribMask;
   GLuint _NumActiveAttribs;
   GLenum _InterpMode[FRAG_ATTRIB_MAX]; /* GL_FLAT or GL_SMOOTH (for now) */

   /* Accum buffer temporaries.
    */
   GLboolean _IntegerAccumMode; 
   GLfloat _IntegerAccumScaler; 
   /* Working values:
    */
   GLuint StippleCounter;    
   GLuint PointLineFacing;
   GLbitfield NewState;
   GLuint StateChanges;
   GLenum Primitive;    /* current primitive being drawn (ala glBegin) */

   void (*InvalidateState)( GLcontext *ctx, GLbitfield new_state );

   GLbitfield InvalidatePointMask;
   GLbitfield InvalidateLineMask;
   GLbitfield InvalidateTriangleMask;
   void (*choose_point)( GLcontext * );
   void (*choose_line)( GLcontext * );
   void (*choose_triangle)( GLcontext * );
   swrast_point_func Point;
   swrast_line_func Line;
   swrast_tri_func Triangle;
   swrast_point_func SpecPoint;
   swrast_line_func SpecLine;
   swrast_tri_func SpecTriangle;
   SWspanarrays *SpanArrays;
   SWspanarrays *ZoomedArrays;  
   SWspan PointSpan;

   blend_func BlendFunc;
   texture_sample_func TextureSample[MAX_TEXTURE_IMAGE_UNITS];

   GLchan *TexelBuffer;

   validate_texture_image_func ValidateTextureImage;

   struct gl_program_machine FragProgMachine;

} SWcontext;


extern void
_swrast_validate_derived( GLcontext *ctx );

extern void
_swrast_update_texture_samplers(GLcontext *ctx);


#define SWRAST_CONTEXT(ctx) ((SWcontext *)ctx->swrast_context)

#define RENDER_START(SWctx, GLctx)          \
   do {                         \
      if ((SWctx)->Driver.SpanRenderStart) {        \
         (*(SWctx)->Driver.SpanRenderStart)(GLctx); \
      }                         \
   } while (0)

#define RENDER_FINISH(SWctx, GLctx)         \
   do {                         \
      if ((SWctx)->Driver.SpanRenderFinish) {       \
         (*(SWctx)->Driver.SpanRenderFinish)(GLctx);    \
      }                         \
   } while (0)



#define RGBA_PIXEL_SIZE(TYPE)                                     \
         ((TYPE == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :      \
          ((TYPE == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)     \
           : 4 * sizeof(GLfloat)))



/*
 * XXX these macros are just bandages for now in order to make
 * CHAN_BITS==32 compile cleanly.
 * These should probably go elsewhere at some point.
 */
#if CHAN_TYPE == GL_FLOAT
#define ChanToFixed(X)  (X)
#define FixedToChan(X)  (X)
#else
#define ChanToFixed(X)  IntToFixed(X)
#define FixedToChan(X)  FixedToInt(X)
#endif


#define ATTRIB_LOOP_BEGIN                                \
   {                                                     \
      GLuint a;                                          \
      for (a = 0; a < swrast->_NumActiveAttribs; a++) {  \
         const GLuint attr = swrast->_ActiveAttribs[a];

#define ATTRIB_LOOP_END } }



#endif