src/mesa/swrast/swrast.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2006  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 "main/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  * wpos = attr[FRAG_ATTRIB_WPOS] and MUST BE THE FIRST values in the
  49  * vertex because of the tnl clipping code.
  50
  51  * wpos[0] and [1] are the screen-coords of SWvertex.
  52  * wpos[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]).
  53  * wpos[3] is 1/w where w is the clip-space W coord.  This is the value
  54  * that clip{XYZ} were multiplied by to get ndc{XYZ}.
  55  *
  56  * Full software drivers:
  57  *   - Register the rastersetup and triangle functions from
  58  *     utils/software_helper.
  59  *   - On statechange, update the rasterization pointers in that module.
  60  *
  61  * Rasterization hardware drivers:
  62  *   - Keep native rastersetup.
  63  *   - Implement native twoside,offset and unfilled triangle setup.
  64  *   - Implement a translator from native vertices to swrast vertices.
  65  *   - On partial fallback (mix of accelerated and unaccelerated
  66  *   prims), call a pass-through function which translates native
  67  *   vertices to SWvertices and calls the appropriate swrast function.
  68  *   - On total fallback (vertex format insufficient for state or all
  69  *     primitives unaccelerated), hook in swrast_setup instead.
  70  */
  71 typedef struct {
  72    GLfloat attrib[FRAG_ATTRIB_MAX][4];
  73    GLchan color[4];   /** integer color */
  74    GLfloat pointSize;
  75 } SWvertex;
  76
  77
  78 /**
  79  * Fixed point data type.
  80  */
  81 typedef int GLfixed;
  82
  83
  84 #define FRAG_ATTRIB_CI FRAG_ATTRIB_COL0
  85
  86
  87 struct swrast_device_driver;
  88
  89
  90 /* These are the public-access functions exported from swrast.
  91  */
  92
  93 extern GLboolean
  94 _swrast_CreateContext( GLcontext *ctx );
  95
  96 extern void
  97 _swrast_DestroyContext( GLcontext *ctx );
  98
  99 /* Get a (non-const) reference to the device driver struct for swrast.
 100  */
 101 extern struct swrast_device_driver *
 102 _swrast_GetDeviceDriverReference( GLcontext *ctx );
 103
 104 extern void
 105 _swrast_Bitmap( GLcontext *ctx,
 106                 GLint px, GLint py,
 107                 GLsizei width, GLsizei height,
 108                 const struct gl_pixelstore_attrib *unpack,
 109                 const GLubyte *bitmap );
 110
 111 extern void
 112 _swrast_CopyPixels( GLcontext *ctx,
 113                     GLint srcx, GLint srcy,
 114                     GLint destx, GLint desty,
 115                     GLsizei width, GLsizei height,
 116                     GLenum type );
 117
 118 extern void
 119 _swrast_DrawPixels( GLcontext *ctx,
 120                     GLint x, GLint y,
 121                     GLsizei width, GLsizei height,
 122                     GLenum format, GLenum type,
 123                     const struct gl_pixelstore_attrib *unpack,
 124                     const GLvoid *pixels );
 125
 126 extern void
 127 _swrast_ReadPixels( GLcontext *ctx,
 128                     GLint x, GLint y, GLsizei width, GLsizei height,
 129                     GLenum format, GLenum type,
 130                     const struct gl_pixelstore_attrib *unpack,
 131                     GLvoid *pixels );
 132
 133 extern void
 134 _swrast_BlitFramebuffer(GLcontext *ctx,
 135                         GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
 136                         GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
 137                         GLbitfield mask, GLenum filter);
 138
 139 extern void
 140 _swrast_Clear(GLcontext *ctx, GLbitfield buffers);
 141
 142 extern void
 143 _swrast_Accum(GLcontext *ctx, GLenum op, GLfloat value);
 144
 145
 146
 147 /* Reset the stipple counter
 148  */
 149 extern void
 150 _swrast_ResetLineStipple( GLcontext *ctx );
 151
 152 /**
 153  * Indicates front/back facing for subsequent points/lines when drawing
 154  * unfilled polygons.  Needed for two-side stencil.
 155  */
 156 extern void
 157 _swrast_SetFacing(GLcontext *ctx, GLuint facing);
 158
 159 /* These will always render the correct point/line/triangle for the
 160  * current state.
 161  *
 162  * For flatshaded primitives, the provoking vertex is the final one.
 163  */
 164 extern void
 165 _swrast_Point( GLcontext *ctx, const SWvertex *v );
 166
 167 extern void
 168 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 );
 169
 170 extern void
 171 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 172                   const SWvertex *v1, const SWvertex *v2 );
 173
 174 extern void
 175 _swrast_Quad( GLcontext *ctx,
 176               const SWvertex *v0, const SWvertex *v1,
 177               const SWvertex *v2,  const SWvertex *v3);
 178
 179 extern void
 180 _swrast_flush( GLcontext *ctx );
 181
 182 extern void
 183 _swrast_render_primitive( GLcontext *ctx, GLenum mode );
 184
 185 extern void
 186 _swrast_render_start( GLcontext *ctx );
 187
 188 extern void
 189 _swrast_render_finish( GLcontext *ctx );
 190
 191 /* Tell the software rasterizer about core state changes.
 192  */
 193 extern void
 194 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state );
 195
 196 /* Configure software rasterizer to match hardware rasterizer characteristics:
 197  */
 198 extern void
 199 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value );
 200
 201 extern void
 202 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value );
 203
 204 /* Debug:
 205  */
 206 extern void
 207 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v );
 208
 209
 210
 211 extern void
 212 _swrast_eject_texture_images(GLcontext *ctx);
 213
 214
 215
 216 /**
 217  * The driver interface for the software rasterizer.
 218  * XXX this may go away.
 219  * We may move these functions to ctx->Driver.RenderStart, RenderEnd.
 220  */
 221 struct swrast_device_driver {
 222    /*
 223     * These are called before and after accessing renderbuffers during
 224     * software rasterization.
 225     *
 226     * These are a suitable place for grabbing/releasing hardware locks.
 227     *
 228     * NOTE: The swrast triangle/line/point routines *DO NOT* call
 229     * these functions.  Locking in that case must be organized by the
 230     * driver by other mechanisms.
 231     */
 232    void (*SpanRenderStart)(GLcontext *ctx);
 233    void (*SpanRenderFinish)(GLcontext *ctx);
 234 };
 235
 236
 237
 238 #endif