src/mesa/swrast/s_context.h

   1 /* $Id: s_context.h,v 1.11 2001/07/13 20:07:37 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell <keithw@valinux.com>
  28  */
  29
  30 #ifndef S_CONTEXT_H
  31 #define S_CONTEXT_H
  32
  33 #include "mtypes.h"
  34 #include "swrast.h"
  35
  36 /*
  37  * For texture sampling:
  38  */
  39 typedef void (*TextureSampleFunc)( GLcontext *ctx, GLuint texUnit,
  40                                    const struct gl_texture_object *tObj,
  41                                    GLuint n,
  42                                    const GLfloat s[], const GLfloat t[],
  43                                    const GLfloat u[], const GLfloat lambda[],
  44                                    GLchan rgba[][4] );
  45
  46
  47
  48 /*
  49  * Blending function
  50  */
  51 #ifdef USE_MMX_ASM
  52 typedef void (_ASMAPIP blend_func)( GLcontext *ctx, GLuint n,
  53                                     const GLubyte mask[],
  54                                     GLchan src[][4], CONST GLchan dst[][4] );
  55 #else
  56 typedef void (*blend_func)( GLcontext *ctx, GLuint n, const GLubyte mask[],
  57                             GLchan src[][4], CONST GLchan dst[][4] );
  58 #endif
  59
  60 typedef void (*swrast_point_func)( GLcontext *ctx, const SWvertex *);
  61
  62 typedef void (*swrast_line_func)( GLcontext *ctx,
  63                                   const SWvertex *, const SWvertex *);
  64
  65 typedef void (*swrast_tri_func)( GLcontext *ctx, const SWvertex *,
  66                                  const SWvertex *, const SWvertex *);
  67
  68
  69
  70 /*
  71  * Bitmasks to indicate which rasterization options are enabled (RasterMask)
  72  */
  73 #define ALPHATEST_BIT           0x001   /* Alpha-test pixels */
  74 #define BLEND_BIT               0x002   /* Blend pixels */
  75 #define DEPTH_BIT               0x004   /* Depth-test pixels */
  76 #define FOG_BIT                 0x008   /* Fog pixels */
  77 #define LOGIC_OP_BIT            0x010   /* Apply logic op in software */
  78 #define SCISSOR_BIT             0x020   /* Scissor pixels */
  79 #define STENCIL_BIT             0x040   /* Stencil pixels */
  80 #define MASKING_BIT             0x080   /* Do glColorMask or glIndexMask */
  81 #define ALPHABUF_BIT            0x100   /* Using software alpha buffer */
  82 #define WINCLIP_BIT             0x200   /* Clip pixels/primitives to window */
  83 #define MULTI_DRAW_BIT          0x400   /* Write to more than one color- */
  84                                         /* buffer or no buffers. */
  85 #define OCCLUSION_BIT           0x800   /* GL_HP_occlusion_test enabled */
  86 #define TEXTURE_BIT             0x1000  /* Texturing really enabled */
  87
  88
  89 #define _SWRAST_NEW_RASTERMASK (_NEW_BUFFERS|   \
  90                                 _NEW_SCISSOR|   \
  91                                 _NEW_COLOR|     \
  92                                 _NEW_DEPTH|     \
  93                                 _NEW_FOG|       \
  94                                 _NEW_STENCIL|   \
  95                                 _NEW_TEXTURE|   \
  96                                 _NEW_VIEWPORT|  \
  97                                 _NEW_DEPTH)
  98
  99
 100
 101 typedef struct
 102 {
 103    /* Driver interface:
 104     */
 105    struct swrast_device_driver Driver;
 106
 107    /* Configuration mechanisms to make software rasterizer match
 108     * characteristics of the hardware rasterizer (if present):
 109     */
 110    GLboolean AllowVertexFog;
 111    GLboolean AllowPixelFog;
 112
 113    /* Derived values, invalidated on statechanges, updated from
 114     * _swrast_validate_derived():
 115     */
 116    GLuint _RasterMask;
 117    GLfloat _MinMagThresh[MAX_TEXTURE_UNITS];
 118    GLfloat _backface_sign;
 119    GLboolean _PreferPixelFog;
 120
 121    /* Accum buffer temporaries.
 122     */
 123    GLboolean _IntegerAccumMode; /* Storing unscaled integers? */
 124    GLfloat _IntegerAccumScaler; /* Implicit scale factor */
 125
 126
 127    /* Working values:
 128     */
 129    struct pixel_buffer* PB;
 130    GLuint StippleCounter;    /* Line stipple counter */
 131    GLuint NewState;
 132    GLuint StateChanges;
 133
 134    /* Mechanism to allow driver (like X11) to register further
 135     * software rasterization routines.
 136     */
 137    void (*choose_point)( GLcontext * );
 138    void (*choose_line)( GLcontext * );
 139    void (*choose_triangle)( GLcontext * );
 140
 141    GLuint invalidate_point;
 142    GLuint invalidate_line;
 143    GLuint invalidate_triangle;
 144
 145
 146    /* Function pointers for dispatch behind public entrypoints.
 147     */
 148    void (*InvalidateState)( GLcontext *ctx, GLuint new_state );
 149
 150    swrast_point_func Point;
 151    swrast_line_func Line;
 152    swrast_tri_func Triangle;
 153
 154    /* Placeholders for when separate specular (or secondary color) is
 155     * enabled but texturing is not.
 156     */
 157    swrast_point_func SpecPoint;
 158    swrast_line_func SpecLine;
 159    swrast_tri_func SpecTriangle;
 160
 161
 162    /* Internal hooks, kept uptodate by the same mechanism as above.
 163     */
 164    blend_func BlendFunc;
 165    TextureSampleFunc TextureSample[MAX_TEXTURE_UNITS];
 166
 167 } SWcontext;
 168
 169
 170 extern void
 171 _swrast_validate_derived( GLcontext *ctx );
 172
 173
 174 #define SWRAST_CONTEXT(ctx) ((SWcontext *)ctx->swrast_context)
 175
 176 #define RENDER_START(SWctx, GLctx)                      \
 177    do {                                                 \
 178       if ((SWctx)->Driver.SpanRenderStart) {            \
 179          (*(SWctx)->Driver.SpanRenderStart)(GLctx);     \
 180       }                                                 \
 181    } while (0)
 182
 183 #define RENDER_FINISH(SWctx, GLctx)                     \
 184    do {                                                 \
 185       if ((SWctx)->Driver.SpanRenderFinish) {           \
 186          (*(SWctx)->Driver.SpanRenderFinish)(GLctx);    \
 187       }                                                 \
 188    } while (0)
 189
 190
 191
 192 /*
 193  * XXX these macros are just bandages for now in order to make
 194  * CHAN_BITS==32 compile cleanly.
 195  * These should probably go elsewhere at some point.
 196  */
 197 #if CHAN_TYPE == GL_FLOAT
 198 #define ChanToFixed(X)  FloatToFixed(X)
 199 #define FixedToChan(X)  FixedToFloat(X)
 200 #else
 201 #define ChanToFixed(X)  IntToFixed(X)
 202 #define FixedToChan(X)  FixedToInt(X)
 203 #endif
 204
 205 #endif