2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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27 * \file swrast/swrast.h
28 * \brief Public interface to the software rasterization functions.
29 * \author Keith Whitwell <keith@tungstengraphics.com>
39 * \brief Data-structure to handle vertices in the software rasterizer.
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
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.
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.
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}.
75 GLfloat attrib
[FRAG_ATTRIB_MAX
][4]; /**< texcoords & varying, more to come */
79 struct swrast_device_driver
;
82 /* These are the public-access functions exported from swrast.
86 _swrast_CreateContext( GLcontext
*ctx
);
89 _swrast_DestroyContext( GLcontext
*ctx
);
91 /* Get a (non-const) reference to the device driver struct for swrast.
93 extern struct swrast_device_driver
*
94 _swrast_GetDeviceDriverReference( GLcontext
*ctx
);
97 _swrast_Bitmap( GLcontext
*ctx
,
99 GLsizei width
, GLsizei height
,
100 const struct gl_pixelstore_attrib
*unpack
,
101 const GLubyte
*bitmap
);
104 _swrast_CopyPixels( GLcontext
*ctx
,
105 GLint srcx
, GLint srcy
,
106 GLint destx
, GLint desty
,
107 GLsizei width
, GLsizei height
,
111 _swrast_DrawPixels( GLcontext
*ctx
,
113 GLsizei width
, GLsizei height
,
114 GLenum format
, GLenum type
,
115 const struct gl_pixelstore_attrib
*unpack
,
116 const GLvoid
*pixels
);
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
,
126 _swrast_BlitFramebuffer(GLcontext
*ctx
,
127 GLint srcX0
, GLint srcY0
, GLint srcX1
, GLint srcY1
,
128 GLint dstX0
, GLint dstY0
, GLint dstX1
, GLint dstY1
,
129 GLbitfield mask
, GLenum filter
);
132 _swrast_Clear(GLcontext
*ctx
, GLbitfield buffers
);
135 _swrast_Accum(GLcontext
*ctx
, GLenum op
, GLfloat value
);
139 /* Reset the stipple counter
142 _swrast_ResetLineStipple( GLcontext
*ctx
);
144 /* These will always render the correct point/line/triangle for the
147 * For flatshaded primitives, the provoking vertex is the final one.
150 _swrast_Point( GLcontext
*ctx
, const SWvertex
*v
);
153 _swrast_Line( GLcontext
*ctx
, const SWvertex
*v0
, const SWvertex
*v1
);
156 _swrast_Triangle( GLcontext
*ctx
, const SWvertex
*v0
,
157 const SWvertex
*v1
, const SWvertex
*v2
);
160 _swrast_Quad( GLcontext
*ctx
,
161 const SWvertex
*v0
, const SWvertex
*v1
,
162 const SWvertex
*v2
, const SWvertex
*v3
);
165 _swrast_flush( GLcontext
*ctx
);
168 _swrast_render_primitive( GLcontext
*ctx
, GLenum mode
);
171 _swrast_render_start( GLcontext
*ctx
);
174 _swrast_render_finish( GLcontext
*ctx
);
176 /* Tell the software rasterizer about core state changes.
179 _swrast_InvalidateState( GLcontext
*ctx
, GLbitfield new_state
);
181 /* Configure software rasterizer to match hardware rasterizer characteristics:
184 _swrast_allow_vertex_fog( GLcontext
*ctx
, GLboolean value
);
187 _swrast_allow_pixel_fog( GLcontext
*ctx
, GLboolean value
);
192 _swrast_print_vertex( GLcontext
*ctx
, const SWvertex
*v
);
196 * Imaging fallbacks (a better solution should be found, perhaps
197 * moving all the imaging fallback code to a new module)
200 _swrast_CopyConvolutionFilter2D(GLcontext
*ctx
, GLenum target
,
201 GLenum internalFormat
,
202 GLint x
, GLint y
, GLsizei width
,
205 _swrast_CopyConvolutionFilter1D(GLcontext
*ctx
, GLenum target
,
206 GLenum internalFormat
,
207 GLint x
, GLint y
, GLsizei width
);
209 _swrast_CopyColorSubTable( GLcontext
*ctx
,GLenum target
, GLsizei start
,
210 GLint x
, GLint y
, GLsizei width
);
212 _swrast_CopyColorTable( GLcontext
*ctx
,
213 GLenum target
, GLenum internalformat
,
214 GLint x
, GLint y
, GLsizei width
);
218 * Texture fallbacks. Could also live in a new module
219 * with the rest of the texture store fallbacks?
222 _swrast_copy_teximage1d(GLcontext
*ctx
, GLenum target
, GLint level
,
223 GLenum internalFormat
,
224 GLint x
, GLint y
, GLsizei width
, GLint border
);
227 _swrast_copy_teximage2d(GLcontext
*ctx
, GLenum target
, GLint level
,
228 GLenum internalFormat
,
229 GLint x
, GLint y
, GLsizei width
, GLsizei height
,
234 _swrast_copy_texsubimage1d(GLcontext
*ctx
, GLenum target
, GLint level
,
235 GLint xoffset
, GLint x
, GLint y
, GLsizei width
);
238 _swrast_copy_texsubimage2d(GLcontext
*ctx
,
239 GLenum target
, GLint level
,
240 GLint xoffset
, GLint yoffset
,
241 GLint x
, GLint y
, GLsizei width
, GLsizei height
);
244 _swrast_copy_texsubimage3d(GLcontext
*ctx
,
245 GLenum target
, GLint level
,
246 GLint xoffset
, GLint yoffset
, GLint zoffset
,
247 GLint x
, GLint y
, GLsizei width
, GLsizei height
);
251 _swrast_eject_texture_images(GLcontext
*ctx
);
254 #if FEATURE_MESA_program_debug
256 _swrast_get_program_register(GLcontext
*, enum register_file file
,
257 GLuint index
, GLfloat val
[4]);
258 #endif /* FEATURE_MESA_program_debug */
262 * The driver interface for the software rasterizer.
263 * XXX this may go away.
264 * We may move these functions to ctx->Driver.RenderStart, RenderEnd.
266 struct swrast_device_driver
{
268 * These are called before and after accessing renderbuffers during
269 * software rasterization.
271 * These are a suitable place for grabbing/releasing hardware locks.
273 * NOTE: The swrast triangle/line/point routines *DO NOT* call
274 * these functions. Locking in that case must be organized by the
275 * driver by other mechanisms.
277 void (*SpanRenderStart
)(GLcontext
*ctx
);
278 void (*SpanRenderFinish
)(GLcontext
*ctx
);