1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
|
/*
* Mesa 3-D graphics library
* Version: 6.5
*
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
/**
* \file swrast/swrast.h
* \brief Public interface to the software rasterization functions.
* \author Keith Whitwell <keith@tungstengraphics.com>
*/
#ifndef SWRAST_H
#define SWRAST_H
#include "mtypes.h"
/**
* \struct SWvertex
* \brief Data-structure to handle vertices in the software rasterizer.
*
* The software rasterizer now uses this format for vertices. Thus a
* 'RasterSetup' stage or other translation is required between the
* tnl module and the swrast rasterization functions. This serves to
* isolate the swrast module from the internals of the tnl module, and
* improve its usefulness as a fallback mechanism for hardware
* drivers.
*
* Full software drivers:
* - Register the rastersetup and triangle functions from
* utils/software_helper.
* - On statechange, update the rasterization pointers in that module.
*
* Rasterization hardware drivers:
* - Keep native rastersetup.
* - Implement native twoside,offset and unfilled triangle setup.
* - Implement a translator from native vertices to swrast vertices.
* - On partial fallback (mix of accelerated and unaccelerated
* prims), call a pass-through function which translates native
* vertices to SWvertices and calls the appropriate swrast function.
* - On total fallback (vertex format insufficient for state or all
* primitives unaccelerated), hook in swrast_setup instead.
*/
typedef struct {
/** win[0], win[1] are the screen-coords of SWvertex.
* win[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]).
* win[3] is 1/w where w is the clip-space W coord. This is the value
* that clip{XYZ} were multiplied by to get ndc{XYZ}.
*/
GLfloat win[4];
GLfloat texcoord[MAX_TEXTURE_COORD_UNITS][4];
GLchan color[4];
GLchan specular[4];
GLfloat fog;
GLfloat index;
GLfloat pointSize;
GLfloat attribute[MAX_VERTEX_ATTRIBS][4];
} SWvertex;
struct swrast_device_driver;
/* These are the public-access functions exported from swrast.
*/
extern GLboolean
_swrast_CreateContext( GLcontext *ctx );
extern void
_swrast_DestroyContext( GLcontext *ctx );
/* Get a (non-const) reference to the device driver struct for swrast.
*/
extern struct swrast_device_driver *
_swrast_GetDeviceDriverReference( GLcontext *ctx );
extern void
_swrast_Bitmap( GLcontext *ctx,
GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap );
extern void
_swrast_CopyPixels( GLcontext *ctx,
GLint srcx, GLint srcy,
GLint destx, GLint desty,
GLsizei width, GLsizei height,
GLenum type );
extern void
_swrast_DrawPixels( GLcontext *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels );
extern void
_swrast_ReadPixels( GLcontext *ctx,
GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *unpack,
GLvoid *pixels );
extern void
_swrast_BlitFramebuffer(GLcontext *ctx,
GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
GLbitfield mask, GLenum filter);
extern void
_swrast_Clear( GLcontext *ctx, GLbitfield mask, GLboolean all,
GLint x, GLint y, GLint width, GLint height );
extern void
_swrast_Accum( GLcontext *ctx, GLenum op,
GLfloat value, GLint xpos, GLint ypos,
GLint width, GLint height );
/* Reset the stipple counter
*/
extern void
_swrast_ResetLineStipple( GLcontext *ctx );
/* These will always render the correct point/line/triangle for the
* current state.
*
* For flatshaded primitives, the provoking vertex is the final one.
*/
extern void
_swrast_Point( GLcontext *ctx, const SWvertex *v );
extern void
_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 );
extern void
_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
const SWvertex *v1, const SWvertex *v2 );
extern void
_swrast_Quad( GLcontext *ctx,
const SWvertex *v0, const SWvertex *v1,
const SWvertex *v2, const SWvertex *v3);
extern void
_swrast_flush( GLcontext *ctx );
extern void
_swrast_render_primitive( GLcontext *ctx, GLenum mode );
extern void
_swrast_render_start( GLcontext *ctx );
extern void
_swrast_render_finish( GLcontext *ctx );
/* Tell the software rasterizer about core state changes.
*/
extern void
_swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state );
/* Configure software rasterizer to match hardware rasterizer characteristics:
*/
extern void
_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value );
extern void
_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value );
/* Debug:
*/
extern void
_swrast_print_vertex( GLcontext *ctx, const SWvertex *v );
/*
* Imaging fallbacks (a better solution should be found, perhaps
* moving all the imaging fallback code to a new module)
*/
extern void
_swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target,
GLenum internalFormat,
GLint x, GLint y, GLsizei width,
GLsizei height);
extern void
_swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target,
GLenum internalFormat,
GLint x, GLint y, GLsizei width);
extern void
_swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
GLint x, GLint y, GLsizei width);
extern void
_swrast_CopyColorTable( GLcontext *ctx,
GLenum target, GLenum internalformat,
GLint x, GLint y, GLsizei width);
/*
* Texture fallbacks. Could also live in a new module
* with the rest of the texture store fallbacks?
*/
extern void
_swrast_copy_teximage1d(GLcontext *ctx, GLenum target, GLint level,
GLenum internalFormat,
GLint x, GLint y, GLsizei width, GLint border);
extern void
_swrast_copy_teximage2d(GLcontext *ctx, GLenum target, GLint level,
GLenum internalFormat,
GLint x, GLint y, GLsizei width, GLsizei height,
GLint border);
extern void
_swrast_copy_texsubimage1d(GLcontext *ctx, GLenum target, GLint level,
GLint xoffset, GLint x, GLint y, GLsizei width);
extern void
_swrast_copy_texsubimage2d(GLcontext *ctx,
GLenum target, GLint level,
GLint xoffset, GLint yoffset,
GLint x, GLint y, GLsizei width, GLsizei height);
extern void
_swrast_copy_texsubimage3d(GLcontext *ctx,
GLenum target, GLint level,
GLint xoffset, GLint yoffset, GLint zoffset,
GLint x, GLint y, GLsizei width, GLsizei height);
extern void
_swrast_eject_texture_images(GLcontext *ctx);
#if FEATURE_MESA_program_debug
extern void
_swrast_get_program_register(GLcontext *, enum register_file file,
GLuint index, GLfloat val[4]);
#endif /* FEATURE_MESA_program_debug */
/**
* The driver interface for the software rasterizer.
* XXX this may go away.
* We may move these functions to ctx->Driver.RenderStart, RenderEnd.
*/
struct swrast_device_driver {
/*
* These are called before and after accessing renderbuffers during
* software rasterization.
*
* These are a suitable place for grabbing/releasing hardware locks.
*
* NOTE: The swrast triangle/line/point routines *DO NOT* call
* these functions. Locking in that case must be organized by the
* driver by other mechanisms.
*/
void (*SpanRenderStart)(GLcontext *ctx);
void (*SpanRenderFinish)(GLcontext *ctx);
};
#endif
|
