src/mesa/swrast/swrast.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  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  */
  25
  26 /**
  27  * \file swrast/swrast.h
  28  * \brief Public interface to the software rasterization functions.
  29  * \author Keith Whitwell <keith@tungstengraphics.com>
  30  */
  31
  32 #ifndef SWRAST_H
  33 #define SWRAST_H
  34
  35 #include "mtypes.h"
  36
  37 /**
  38  * \struct SWvertex
  39  * \brief Data-structure to handle vertices in the software rasterizer.
  40  *
  41  * The software rasterizer now uses this format for vertices.  Thus a
  42  * 'RasterSetup' stage or other translation is required between the
  43  * tnl module and the swrast rasterization functions.  This serves to
  44  * isolate the swrast module from the internals of the tnl module, and
  45  * improve its usefulness as a fallback mechanism for hardware
  46  * drivers.
  47  *
  48  * Full software drivers:
  49  *   - Register the rastersetup and triangle functions from
  50  *     utils/software_helper.
  51  *   - On statechange, update the rasterization pointers in that module.
  52  *
  53  * Rasterization hardware drivers:
  54  *   - Keep native rastersetup.
  55  *   - Implement native twoside,offset and unfilled triangle setup.
  56  *   - Implement a translator from native vertices to swrast vertices.
  57  *   - On partial fallback (mix of accelerated and unaccelerated
  58  *   prims), call a pass-through function which translates native
  59  *   vertices to SWvertices and calls the appropriate swrast function.
  60  *   - On total fallback (vertex format insufficient for state or all
  61  *     primitives unaccelerated), hook in swrast_setup instead.
  62  */
  63 typedef struct {
  64    /** win[0], win[1] are the screen-coords of SWvertex.
  65     * win[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]).
  66     * win[3] is 1/w where w is the clip-space W coord.  This is the value
  67     * that clip{XYZ} were multiplied by to get ndc{XYZ}.
  68     */
  69    GLfloat win[4];
  70    GLfloat texcoord[MAX_TEXTURE_COORD_UNITS][4];
  71    GLchan color[4];
  72    GLchan specular[4];
  73    GLfloat fog;
  74    GLfloat index;
  75    GLfloat pointSize;
  76 } SWvertex;
  77
  78
  79 struct swrast_device_driver;
  80
  81
  82 /* These are the public-access functions exported from swrast.
  83  */
  84
  85 extern GLboolean
  86 _swrast_CreateContext( GLcontext *ctx );
  87
  88 extern void
  89 _swrast_DestroyContext( GLcontext *ctx );
  90
  91 /* Get a (non-const) reference to the device driver struct for swrast.
  92  */
  93 extern struct swrast_device_driver *
  94 _swrast_GetDeviceDriverReference( GLcontext *ctx );
  95
  96 extern void
  97 _swrast_Bitmap( GLcontext *ctx,
  98                 GLint px, GLint py,
  99                 GLsizei width, GLsizei height,
 100                 const struct gl_pixelstore_attrib *unpack,
 101                 const GLubyte *bitmap );
 102
 103 extern void
 104 _swrast_CopyPixels( GLcontext *ctx,
 105                     GLint srcx, GLint srcy,
 106                     GLint destx, GLint desty,
 107                     GLsizei width, GLsizei height,
 108                     GLenum type );
 109
 110 extern void
 111 _swrast_DrawPixels( GLcontext *ctx,
 112                     GLint x, GLint y,
 113                     GLsizei width, GLsizei height,
 114                     GLenum format, GLenum type,
 115                     const struct gl_pixelstore_attrib *unpack,
 116                     const GLvoid *pixels );
 117
 118 extern void
 119 _swrast_ReadPixels( GLcontext *ctx,
 120                     GLint x, GLint y, GLsizei width, GLsizei height,
 121                     GLenum format, GLenum type,
 122                     const struct gl_pixelstore_attrib *unpack,
 123                     GLvoid *pixels );
 124
 125 extern void
 126 _swrast_Clear( GLcontext *ctx, GLbitfield mask, GLboolean all,
 127                GLint x, GLint y, GLint width, GLint height );
 128
 129 extern void
 130 _swrast_Accum( GLcontext *ctx, GLenum op,
 131                GLfloat value, GLint xpos, GLint ypos,
 132                GLint width, GLint height );
 133
 134
 135
 136 /* Reset the stipple counter
 137  */
 138 extern void
 139 _swrast_ResetLineStipple( GLcontext *ctx );
 140
 141 /* These will always render the correct point/line/triangle for the
 142  * current state.
 143  *
 144  * For flatshaded primitives, the provoking vertex is the final one.
 145  */
 146 extern void
 147 _swrast_Point( GLcontext *ctx, const SWvertex *v );
 148
 149 extern void
 150 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 );
 151
 152 extern void
 153 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 154                   const SWvertex *v1, const SWvertex *v2 );
 155
 156 extern void
 157 _swrast_Quad( GLcontext *ctx,
 158               const SWvertex *v0, const SWvertex *v1,
 159               const SWvertex *v2,  const SWvertex *v3);
 160
 161 extern void
 162 _swrast_flush( GLcontext *ctx );
 163
 164 extern void
 165 _swrast_render_primitive( GLcontext *ctx, GLenum mode );
 166
 167 extern void
 168 _swrast_render_start( GLcontext *ctx );
 169
 170 extern void
 171 _swrast_render_finish( GLcontext *ctx );
 172
 173 /* Tell the software rasterizer about core state changes.
 174  */
 175 extern void
 176 _swrast_InvalidateState( GLcontext *ctx, GLuint new_state );
 177
 178 /* Configure software rasterizer to match hardware rasterizer characteristics:
 179  */
 180 extern void
 181 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value );
 182
 183 extern void
 184 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value );
 185
 186 /* Debug:
 187  */
 188 extern void
 189 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v );
 190
 191
 192 /*
 193  * Imaging fallbacks (a better solution should be found, perhaps
 194  * moving all the imaging fallback code to a new module)
 195  */
 196 extern void
 197 _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
 198                                 GLenum internalFormat,
 199                                 GLint x, GLint y, GLsizei width,
 200                                 GLsizei height);
 201 extern void
 202 _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
 203                                 GLenum internalFormat,
 204                                 GLint x, GLint y, GLsizei width);
 205 extern void
 206 _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
 207                            GLint x, GLint y, GLsizei width);
 208 extern void
 209 _swrast_CopyColorTable( GLcontext *ctx,
 210                         GLenum target, GLenum internalformat,
 211                         GLint x, GLint y, GLsizei width);
 212
 213
 214 /*
 215  * Texture fallbacks.  Could also live in a new module
 216  * with the rest of the texture store fallbacks?
 217  */
 218 extern void
 219 _swrast_copy_teximage1d(GLcontext *ctx, GLenum target, GLint level,
 220                         GLenum internalFormat,
 221                         GLint x, GLint y, GLsizei width, GLint border);
 222
 223 extern void
 224 _swrast_copy_teximage2d(GLcontext *ctx, GLenum target, GLint level,
 225                         GLenum internalFormat,
 226                         GLint x, GLint y, GLsizei width, GLsizei height,
 227                         GLint border);
 228
 229
 230 extern void
 231 _swrast_copy_texsubimage1d(GLcontext *ctx, GLenum target, GLint level,
 232                            GLint xoffset, GLint x, GLint y, GLsizei width);
 233
 234 extern void
 235 _swrast_copy_texsubimage2d(GLcontext *ctx,
 236                            GLenum target, GLint level,
 237                            GLint xoffset, GLint yoffset,
 238                            GLint x, GLint y, GLsizei width, GLsizei height);
 239
 240 extern void
 241 _swrast_copy_texsubimage3d(GLcontext *ctx,
 242                            GLenum target, GLint level,
 243                            GLint xoffset, GLint yoffset, GLint zoffset,
 244                            GLint x, GLint y, GLsizei width, GLsizei height);
 245
 246
 247 /**
 248  * The driver interface for the software rasterizer.
 249  * XXX this may go away.
 250  * We may move these functions to ctx->Driver.RenderStart, RenderEnd.
 251  */
 252 struct swrast_device_driver {
 253    /*
 254     * These are called before and after accessing renderbuffers during
 255     * software rasterization.
 256     *
 257     * These are a suitable place for grabbing/releasing hardware locks.
 258     *
 259     * NOTE: The swrast triangle/line/point routines *DO NOT* call
 260     * these functions.  Locking in that case must be organized by the
 261     * driver by other mechanisms.
 262     */
 263    void (*SpanRenderStart)(GLcontext *ctx);
 264    void (*SpanRenderFinish)(GLcontext *ctx);
 265 };
 266
 267
 268
 269 #endif