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);