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  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. #define FRAG_ATTRIB_CI FRAG_ATTRIB_COL0
  79.  
  80.  
  81. struct swrast_device_driver;
  82.  
  83.  
  84. /* These are the public-access functions exported from swrast.
  85.  */
  86.  
  87. extern GLboolean
  88. _swrast_CreateContext( struct gl_context *ctx );
  89.  
  90. extern void
  91. _swrast_DestroyContext( struct gl_context *ctx );
  92.  
  93. /* Get a (non-const) reference to the device driver struct for swrast.
  94.  */
  95. extern struct swrast_device_driver *
  96. _swrast_GetDeviceDriverReference( struct gl_context *ctx );
  97.  
  98. extern void
  99. _swrast_Bitmap( struct gl_context *ctx,
  100.                 GLint px, GLint py,
  101.                 GLsizei width, GLsizei height,
  102.                 const struct gl_pixelstore_attrib *unpack,
  103.                 const GLubyte *bitmap );
  104.  
  105. extern void
  106. _swrast_CopyPixels( struct gl_context *ctx,
  107.                     GLint srcx, GLint srcy,
  108.                     GLint destx, GLint desty,
  109.                     GLsizei width, GLsizei height,
  110.                     GLenum type );
  111.  
  112. extern void
  113. _swrast_DrawPixels( struct gl_context *ctx,
  114.                     GLint x, GLint y,
  115.                     GLsizei width, GLsizei height,
  116.                     GLenum format, GLenum type,
  117.                     const struct gl_pixelstore_attrib *unpack,
  118.                     const GLvoid *pixels );
  119.  
  120. extern void
  121. _swrast_ReadPixels( struct gl_context *ctx,
  122.                     GLint x, GLint y, GLsizei width, GLsizei height,
  123.                     GLenum format, GLenum type,
  124.                     const struct gl_pixelstore_attrib *unpack,
  125.                     GLvoid *pixels );
  126.  
  127. extern void
  128. _swrast_BlitFramebuffer(struct gl_context *ctx,
  129.                         GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
  130.                         GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
  131.                         GLbitfield mask, GLenum filter);
  132.  
  133. extern void
  134. _swrast_Clear(struct gl_context *ctx, GLbitfield buffers);
  135.  
  136. extern void
  137. _swrast_Accum(struct gl_context *ctx, GLenum op, GLfloat value);
  138.  
  139.  
  140.  
  141. /* Reset the stipple counter
  142.  */
  143. extern void
  144. _swrast_ResetLineStipple( struct gl_context *ctx );
  145.  
  146. /**
  147.  * Indicates front/back facing for subsequent points/lines when drawing
  148.  * unfilled polygons.  Needed for two-side stencil.
  149.  */
  150. extern void
  151. _swrast_SetFacing(struct gl_context *ctx, GLuint facing);
  152.  
  153. /* These will always render the correct point/line/triangle for the
  154.  * current state.
  155.  *
  156.  * For flatshaded primitives, the provoking vertex is the final one.
  157.  */
  158. extern void
  159. _swrast_Point( struct gl_context *ctx, const SWvertex *v );
  160.  
  161. extern void
  162. _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 );
  163.  
  164. extern void
  165. _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
  166.                   const SWvertex *v1, const SWvertex *v2 );
  167.  
  168. extern void
  169. _swrast_Quad( struct gl_context *ctx,
  170.               const SWvertex *v0, const SWvertex *v1,
  171.               const SWvertex *v2,  const SWvertex *v3);
  172.  
  173. extern void
  174. _swrast_flush( struct gl_context *ctx );
  175.  
  176. extern void
  177. _swrast_render_primitive( struct gl_context *ctx, GLenum mode );
  178.  
  179. extern void
  180. _swrast_render_start( struct gl_context *ctx );
  181.  
  182. extern void
  183. _swrast_render_finish( struct gl_context *ctx );
  184.  
  185. /* Tell the software rasterizer about core state changes.
  186.  */
  187. extern void
  188. _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state );
  189.  
  190. /* Configure software rasterizer to match hardware rasterizer characteristics:
  191.  */
  192. extern void
  193. _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value );
  194.  
  195. extern void
  196. _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value );
  197.  
  198. /* Debug:
  199.  */
  200. extern void
  201. _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v );
  202.  
  203.  
  204.  
  205. extern void
  206. _swrast_eject_texture_images(struct gl_context *ctx);
  207.  
  208.  
  209.  
  210. /**
  211.  * The driver interface for the software rasterizer.
  212.  * XXX this may go away.
  213.  * We may move these functions to ctx->Driver.RenderStart, RenderEnd.
  214.  */
  215. struct swrast_device_driver {
  216.    /*
  217.     * These are called before and after accessing renderbuffers during
  218.     * software rasterization.
  219.     *
  220.     * These are a suitable place for grabbing/releasing hardware locks.
  221.     *
  222.     * NOTE: The swrast triangle/line/point routines *DO NOT* call
  223.     * these functions.  Locking in that case must be organized by the
  224.     * driver by other mechanisms.
  225.     */
  226.    void (*SpanRenderStart)(struct gl_context *ctx);
  227.    void (*SpanRenderFinish)(struct gl_context *ctx);
  228. };
  229.  
  230.  
  231.  
  232. #endif
  233.