src/mesa/swrast/s_context.h

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