src/mesa/swrast/s_context.h

   1 /* $Id: s_context.h,v 1.14 2002/01/10 16:54:29 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  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, GLfloat texcoords[][4],
  42                                    const GLfloat lambda[], 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    /* Driver interface:
 102     */
 103    struct swrast_device_driver Driver;
 104
 105    /* Configuration mechanisms to make software rasterizer match
 106     * characteristics of the hardware rasterizer (if present):
 107     */
 108    GLboolean AllowVertexFog;
 109    GLboolean AllowPixelFog;
 110
 111    /* Derived values, invalidated on statechanges, updated from
 112     * _swrast_validate_derived():
 113     */
 114    GLuint _RasterMask;
 115    GLfloat _MinMagThresh[MAX_TEXTURE_UNITS];
 116    GLfloat _backface_sign;
 117    GLboolean _PreferPixelFog;
 118
 119    /* Accum buffer temporaries.
 120     */
 121    GLboolean _IntegerAccumMode; /* Storing unscaled integers? */
 122    GLfloat _IntegerAccumScaler; /* Implicit scale factor */
 123
 124
 125    /* Working values:
 126     */
 127    struct pixel_buffer* PB;
 128    GLuint StippleCounter;    /* Line stipple counter */
 129    GLuint NewState;
 130    GLuint StateChanges;
 131
 132
 133    /* Mechanism to allow driver (like X11) to register further
 134     * software rasterization routines.
 135     */
 136    void (*choose_point)( GLcontext * );
 137    void (*choose_line)( GLcontext * );
 138    void (*choose_triangle)( GLcontext * );
 139
 140    GLuint invalidate_point;
 141    GLuint invalidate_line;
 142    GLuint invalidate_triangle;
 143
 144
 145    /* Function pointers for dispatch behind public entrypoints.
 146     */
 147    void (*InvalidateState)( GLcontext *ctx, GLuint new_state );
 148
 149    swrast_point_func Point;
 150    swrast_line_func Line;
 151    swrast_tri_func Triangle;
 152
 153    /* Placeholders for when separate specular (or secondary color) is
 154     * enabled but texturing is not.
 155     */
 156    swrast_point_func SpecPoint;
 157    swrast_line_func SpecLine;
 158    swrast_tri_func SpecTriangle;
 159
 160
 161    /* Internal hooks, kept uptodate by the same mechanism as above.
 162     */
 163    blend_func BlendFunc;
 164    TextureSampleFunc TextureSample[MAX_TEXTURE_UNITS];
 165
 166 } SWcontext;
 167
 168
 169 extern void
 170 _swrast_validate_derived( GLcontext *ctx );
 171
 172
 173 #define SWRAST_CONTEXT(ctx) ((SWcontext *)ctx->swrast_context)
 174
 175 #define RENDER_START(SWctx, GLctx)                      \
 176    do {                                                 \
 177       if ((SWctx)->Driver.SpanRenderStart) {            \
 178          (*(SWctx)->Driver.SpanRenderStart)(GLctx);     \
 179       }                                                 \
 180    } while (0)
 181
 182 #define RENDER_FINISH(SWctx, GLctx)                     \
 183    do {                                                 \
 184       if ((SWctx)->Driver.SpanRenderFinish) {           \
 185          (*(SWctx)->Driver.SpanRenderFinish)(GLctx);    \
 186       }                                                 \
 187    } while (0)
 188
 189
 190
 191 /*
 192  * XXX these macros are just bandages for now in order to make
 193  * CHAN_BITS==32 compile cleanly.
 194  * These should probably go elsewhere at some point.
 195  */
 196 #if CHAN_TYPE == GL_FLOAT
 197 #define ChanToFixed(X)  (X)
 198 #define FixedToChan(X)  (X)
 199 #else
 200 #define ChanToFixed(X)  IntToFixed(X)
 201 #define FixedToChan(X)  FixedToInt(X)
 202 #endif
 203
 204 #endif