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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the "Software"),
  8.  * to deal in the Software without restriction, including without limitation
  9.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10.  * and/or sell copies of the Software, and to permit persons to whom the
  11.  * Software is furnished to do so, subject to the following conditions:
  12.  *
  13.  * The above copyright notice and this permission notice shall be included
  14.  * in all copies or substantial portions of the Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22.  * 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. #include "swrast/s_chan.h"
  37.  
  38.  
  39. /**
  40.  * If non-zero use GLdouble for walking triangle edges, for better accuracy.
  41.  */
  42. #define TRIANGLE_WALK_DOUBLE 0
  43.  
  44.  
  45. /**
  46.  * Bits per depth buffer value (max is 32).
  47.  */
  48. #ifndef DEFAULT_SOFTWARE_DEPTH_BITS
  49. #define DEFAULT_SOFTWARE_DEPTH_BITS 16
  50. #endif
  51. /** Depth buffer data type */
  52. #if DEFAULT_SOFTWARE_DEPTH_BITS <= 16
  53. #define DEFAULT_SOFTWARE_DEPTH_TYPE GLushort
  54. #else
  55. #define DEFAULT_SOFTWARE_DEPTH_TYPE GLuint
  56. #endif
  57.  
  58.  
  59. /**
  60.  * Max image/surface/texture size.
  61.  */
  62. #define SWRAST_MAX_WIDTH 16384
  63. #define SWRAST_MAX_HEIGHT 16384
  64.  
  65.  
  66. /**
  67.  * \struct SWvertex
  68.  * \brief Data-structure to handle vertices in the software rasterizer.
  69.  *
  70.  * The software rasterizer now uses this format for vertices.  Thus a
  71.  * 'RasterSetup' stage or other translation is required between the
  72.  * tnl module and the swrast rasterization functions.  This serves to
  73.  * isolate the swrast module from the internals of the tnl module, and
  74.  * improve its usefulness as a fallback mechanism for hardware
  75.  * drivers.
  76.  *
  77.  * wpos = attr[VARYING_SLOT_POS] and MUST BE THE FIRST values in the
  78.  * vertex because of the tnl clipping code.
  79.  
  80.  * wpos[0] and [1] are the screen-coords of SWvertex.
  81.  * wpos[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]).
  82.  * wpos[3] is 1/w where w is the clip-space W coord.  This is the value
  83.  * that clip{XYZ} were multiplied by to get ndc{XYZ}.
  84.  *
  85.  * Full software drivers:
  86.  *   - Register the rastersetup and triangle functions from
  87.  *     utils/software_helper.
  88.  *   - On statechange, update the rasterization pointers in that module.
  89.  *
  90.  * Rasterization hardware drivers:
  91.  *   - Keep native rastersetup.
  92.  *   - Implement native twoside,offset and unfilled triangle setup.
  93.  *   - Implement a translator from native vertices to swrast vertices.
  94.  *   - On partial fallback (mix of accelerated and unaccelerated
  95.  *   prims), call a pass-through function which translates native
  96.  *   vertices to SWvertices and calls the appropriate swrast function.
  97.  *   - On total fallback (vertex format insufficient for state or all
  98.  *     primitives unaccelerated), hook in swrast_setup instead.
  99.  */
  100. typedef struct {
  101.    GLfloat attrib[VARYING_SLOT_MAX][4];
  102.    GLchan color[4];   /** integer color */
  103.    GLfloat pointSize;
  104. } SWvertex;
  105.  
  106.  
  107. #define VARYING_SLOT_CI VARYING_SLOT_COL0
  108.  
  109.  
  110. struct swrast_device_driver;
  111.  
  112.  
  113. /* These are the public-access functions exported from swrast.
  114.  */
  115.  
  116. extern GLboolean
  117. _swrast_CreateContext( struct gl_context *ctx );
  118.  
  119. extern void
  120. _swrast_DestroyContext( struct gl_context *ctx );
  121.  
  122. /* Get a (non-const) reference to the device driver struct for swrast.
  123.  */
  124. extern struct swrast_device_driver *
  125. _swrast_GetDeviceDriverReference( struct gl_context *ctx );
  126.  
  127. extern void
  128. _swrast_Bitmap( struct gl_context *ctx,
  129.                 GLint px, GLint py,
  130.                 GLsizei width, GLsizei height,
  131.                 const struct gl_pixelstore_attrib *unpack,
  132.                 const GLubyte *bitmap );
  133.  
  134. extern void
  135. _swrast_CopyPixels( struct gl_context *ctx,
  136.                     GLint srcx, GLint srcy,
  137.                     GLint destx, GLint desty,
  138.                     GLsizei width, GLsizei height,
  139.                     GLenum type );
  140.  
  141. extern GLboolean
  142. swrast_fast_copy_pixels(struct gl_context *ctx,
  143.                         GLint srcX, GLint srcY, GLsizei width, GLsizei height,
  144.                         GLint dstX, GLint dstY, GLenum type);
  145.  
  146. extern void
  147. _swrast_DrawPixels( struct gl_context *ctx,
  148.                     GLint x, GLint y,
  149.                     GLsizei width, GLsizei height,
  150.                     GLenum format, GLenum type,
  151.                     const struct gl_pixelstore_attrib *unpack,
  152.                     const GLvoid *pixels );
  153.  
  154. extern void
  155. _swrast_BlitFramebuffer(struct gl_context *ctx,
  156.                         GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
  157.                         GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
  158.                         GLbitfield mask, GLenum filter);
  159.  
  160. extern void
  161. _swrast_Clear(struct gl_context *ctx, GLbitfield buffers);
  162.  
  163.  
  164.  
  165. /* Reset the stipple counter
  166.  */
  167. extern void
  168. _swrast_ResetLineStipple( struct gl_context *ctx );
  169.  
  170. /**
  171.  * Indicates front/back facing for subsequent points/lines when drawing
  172.  * unfilled polygons.  Needed for two-side stencil.
  173.  */
  174. extern void
  175. _swrast_SetFacing(struct gl_context *ctx, GLuint facing);
  176.  
  177. /* These will always render the correct point/line/triangle for the
  178.  * current state.
  179.  *
  180.  * For flatshaded primitives, the provoking vertex is the final one.
  181.  */
  182. extern void
  183. _swrast_Point( struct gl_context *ctx, const SWvertex *v );
  184.  
  185. extern void
  186. _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 );
  187.  
  188. extern void
  189. _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
  190.                   const SWvertex *v1, const SWvertex *v2 );
  191.  
  192. extern void
  193. _swrast_Quad( struct gl_context *ctx,
  194.               const SWvertex *v0, const SWvertex *v1,
  195.               const SWvertex *v2,  const SWvertex *v3);
  196.  
  197. extern void
  198. _swrast_flush( struct gl_context *ctx );
  199.  
  200. extern void
  201. _swrast_render_primitive( struct gl_context *ctx, GLenum mode );
  202.  
  203. extern void
  204. _swrast_render_start( struct gl_context *ctx );
  205.  
  206. extern void
  207. _swrast_render_finish( struct gl_context *ctx );
  208.  
  209. extern struct gl_texture_image *
  210. _swrast_new_texture_image( struct gl_context *ctx );
  211.  
  212. extern void
  213. _swrast_delete_texture_image(struct gl_context *ctx,
  214.                              struct gl_texture_image *texImage);
  215.  
  216. extern GLboolean
  217. _swrast_alloc_texture_image_buffer(struct gl_context *ctx,
  218.                                    struct gl_texture_image *texImage);
  219.  
  220. extern GLboolean
  221. _swrast_init_texture_image(struct gl_texture_image *texImage);
  222.  
  223. extern void
  224. _swrast_free_texture_image_buffer(struct gl_context *ctx,
  225.                                   struct gl_texture_image *texImage);
  226.  
  227. extern void
  228. _swrast_map_teximage(struct gl_context *ctx,
  229.                      struct gl_texture_image *texImage,
  230.                      GLuint slice,
  231.                      GLuint x, GLuint y, GLuint w, GLuint h,
  232.                      GLbitfield mode,
  233.                      GLubyte **mapOut,
  234.                      GLint *rowStrideOut);
  235.  
  236. extern void
  237. _swrast_unmap_teximage(struct gl_context *ctx,
  238.                        struct gl_texture_image *texImage,
  239.                        GLuint slice);
  240.  
  241. /* Tell the software rasterizer about core state changes.
  242.  */
  243. extern void
  244. _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state );
  245.  
  246. /* Configure software rasterizer to match hardware rasterizer characteristics:
  247.  */
  248. extern void
  249. _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value );
  250.  
  251. extern void
  252. _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value );
  253.  
  254. /* Debug:
  255.  */
  256. extern void
  257. _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v );
  258.  
  259.  
  260.  
  261. extern void
  262. _swrast_eject_texture_images(struct gl_context *ctx);
  263.  
  264.  
  265. extern void
  266. _swrast_render_texture(struct gl_context *ctx,
  267.                        struct gl_framebuffer *fb,
  268.                        struct gl_renderbuffer_attachment *att);
  269.  
  270. extern void
  271. _swrast_finish_render_texture(struct gl_context *ctx,
  272.                               struct gl_renderbuffer *rb);
  273.  
  274.  
  275. /**
  276.  * The driver interface for the software rasterizer.
  277.  * XXX this may go away.
  278.  * We may move these functions to ctx->Driver.RenderStart, RenderEnd.
  279.  */
  280. struct swrast_device_driver {
  281.    /*
  282.     * These are called before and after accessing renderbuffers during
  283.     * software rasterization.
  284.     *
  285.     * These are a suitable place for grabbing/releasing hardware locks.
  286.     *
  287.     * NOTE: The swrast triangle/line/point routines *DO NOT* call
  288.     * these functions.  Locking in that case must be organized by the
  289.     * driver by other mechanisms.
  290.     */
  291.    void (*SpanRenderStart)(struct gl_context *ctx);
  292.    void (*SpanRenderFinish)(struct gl_context *ctx);
  293. };
  294.  
  295.  
  296.  
  297. #endif
  298.