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>
35 #include "main/mtypes.h"
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 * wpos = attr[FRAG_ATTRIB_WPOS] and MUST BE THE FIRST values in the
49 * vertex because of the tnl clipping code.
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}.
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.
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.
72 GLfloat attrib
[FRAG_ATTRIB_MAX
][4];
73 GLchan color
[4]; /** integer color */
79 * Fixed point data type.
84 #define FRAG_ATTRIB_CI FRAG_ATTRIB_COL0
87 struct swrast_device_driver
;
90 /* These are the public-access functions exported from swrast.
94 _swrast_CreateContext( GLcontext
*ctx
);
97 _swrast_DestroyContext( GLcontext
*ctx
);
99 /* Get a (non-const) reference to the device driver struct for swrast.
101 extern struct swrast_device_driver
*
102 _swrast_GetDeviceDriverReference( GLcontext
*ctx
);
105 _swrast_Bitmap( GLcontext
*ctx
,
107 GLsizei width
, GLsizei height
,
108 const struct gl_pixelstore_attrib
*unpack
,
109 const GLubyte
*bitmap
);
112 _swrast_CopyPixels( GLcontext
*ctx
,
113 GLint srcx
, GLint srcy
,
114 GLint destx
, GLint desty
,
115 GLsizei width
, GLsizei height
,
119 _swrast_DrawPixels( GLcontext
*ctx
,
121 GLsizei width
, GLsizei height
,
122 GLenum format
, GLenum type
,
123 const struct gl_pixelstore_attrib
*unpack
,
124 const GLvoid
*pixels
);
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
,
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
);
140 _swrast_Clear(GLcontext
*ctx
, GLbitfield buffers
);
143 _swrast_Accum(GLcontext
*ctx
, GLenum op
, GLfloat value
);
147 /* Reset the stipple counter
150 _swrast_ResetLineStipple( GLcontext
*ctx
);
153 * Indicates front/back facing for subsequent points/lines when drawing
154 * unfilled polygons. Needed for two-side stencil.
157 _swrast_SetFacing(GLcontext
*ctx
, GLuint facing
);
159 /* These will always render the correct point/line/triangle for the
162 * For flatshaded primitives, the provoking vertex is the final one.
165 _swrast_Point( GLcontext
*ctx
, const SWvertex
*v
);
168 _swrast_Line( GLcontext
*ctx
, const SWvertex
*v0
, const SWvertex
*v1
);
171 _swrast_Triangle( GLcontext
*ctx
, const SWvertex
*v0
,
172 const SWvertex
*v1
, const SWvertex
*v2
);
175 _swrast_Quad( GLcontext
*ctx
,
176 const SWvertex
*v0
, const SWvertex
*v1
,
177 const SWvertex
*v2
, const SWvertex
*v3
);
180 _swrast_flush( GLcontext
*ctx
);
183 _swrast_render_primitive( GLcontext
*ctx
, GLenum mode
);
186 _swrast_render_start( GLcontext
*ctx
);
189 _swrast_render_finish( GLcontext
*ctx
);
191 /* Tell the software rasterizer about core state changes.
194 _swrast_InvalidateState( GLcontext
*ctx
, GLbitfield new_state
);
196 /* Configure software rasterizer to match hardware rasterizer characteristics:
199 _swrast_allow_vertex_fog( GLcontext
*ctx
, GLboolean value
);
202 _swrast_allow_pixel_fog( GLcontext
*ctx
, GLboolean value
);
207 _swrast_print_vertex( GLcontext
*ctx
, const SWvertex
*v
);
211 * Imaging fallbacks (a better solution should be found, perhaps
212 * moving all the imaging fallback code to a new module)
215 _swrast_CopyConvolutionFilter2D(GLcontext
*ctx
, GLenum target
,
216 GLenum internalFormat
,
217 GLint x
, GLint y
, GLsizei width
,
220 _swrast_CopyConvolutionFilter1D(GLcontext
*ctx
, GLenum target
,
221 GLenum internalFormat
,
222 GLint x
, GLint y
, GLsizei width
);
224 _swrast_CopyColorSubTable( GLcontext
*ctx
,GLenum target
, GLsizei start
,
225 GLint x
, GLint y
, GLsizei width
);
227 _swrast_CopyColorTable( GLcontext
*ctx
,
228 GLenum target
, GLenum internalformat
,
229 GLint x
, GLint y
, GLsizei width
);
233 * Texture fallbacks. Could also live in a new module
234 * with the rest of the texture store fallbacks?
237 _swrast_copy_teximage1d(GLcontext
*ctx
, GLenum target
, GLint level
,
238 GLenum internalFormat
,
239 GLint x
, GLint y
, GLsizei width
, GLint border
);
242 _swrast_copy_teximage2d(GLcontext
*ctx
, GLenum target
, GLint level
,
243 GLenum internalFormat
,
244 GLint x
, GLint y
, GLsizei width
, GLsizei height
,
249 _swrast_copy_texsubimage1d(GLcontext
*ctx
, GLenum target
, GLint level
,
250 GLint xoffset
, GLint x
, GLint y
, GLsizei width
);
253 _swrast_copy_texsubimage2d(GLcontext
*ctx
,
254 GLenum target
, GLint level
,
255 GLint xoffset
, GLint yoffset
,
256 GLint x
, GLint y
, GLsizei width
, GLsizei height
);
259 _swrast_copy_texsubimage3d(GLcontext
*ctx
,
260 GLenum target
, GLint level
,
261 GLint xoffset
, GLint yoffset
, GLint zoffset
,
262 GLint x
, GLint y
, GLsizei width
, GLsizei height
);
266 _swrast_eject_texture_images(GLcontext
*ctx
);
271 * The driver interface for the software rasterizer.
272 * XXX this may go away.
273 * We may move these functions to ctx->Driver.RenderStart, RenderEnd.
275 struct swrast_device_driver
{
277 * These are called before and after accessing renderbuffers during
278 * software rasterization.
280 * These are a suitable place for grabbing/releasing hardware locks.
282 * NOTE: The swrast triangle/line/point routines *DO NOT* call
283 * these functions. Locking in that case must be organized by the
284 * driver by other mechanisms.
286 void (*SpanRenderStart
)(GLcontext
*ctx
);
287 void (*SpanRenderFinish
)(GLcontext
*ctx
);