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
|
/*
* 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 "main/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.
*
* wpos = attr[FRAG_ATTRIB_WPOS] and MUST BE THE FIRST values in the
* vertex because of the tnl clipping code.
* wpos[0] and [1] are the screen-coords of SWvertex.
* wpos[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]).
* wpos[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}.
*
* 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 {
GLfloat attrib[FRAG_ATTRIB_MAX][4];
GLchan color[4]; /** integer color */
GLfloat pointSize;
} SWvertex;
#define FRAG_ATTRIB_CI FRAG_ATTRIB_COL0
struct swrast_device_driver;
/* These are the public-access functions exported from swrast.
*/
extern GLboolean
_swrast_CreateContext( struct gl_context *ctx );
extern void
_swrast_DestroyContext( struct gl_context *ctx );
/* Get a (non-const) reference to the device driver struct for swrast.
*/
extern struct swrast_device_driver *
_swrast_GetDeviceDriverReference( struct gl_context *ctx );
extern void
_swrast_Bitmap( struct gl_context *ctx,
GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap );
extern void
_swrast_CopyPixels( struct gl_context *ctx,
GLint srcx, GLint srcy,
GLint destx, GLint desty,
GLsizei width, GLsizei height,
GLenum type );
extern void
_swrast_DrawPixels( struct gl_context *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( struct gl_context *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(struct gl_context *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(struct gl_context *ctx, GLbitfield buffers);
extern void
_swrast_Accum(struct gl_context *ctx, GLenum op, GLfloat value);
/* Reset the stipple counter
*/
extern void
_swrast_ResetLineStipple( struct gl_context *ctx );
/**
* Indicates front/back facing for subsequent points/lines when drawing
* unfilled polygons. Needed for two-side stencil.
*/
extern void
_swrast_SetFacing(struct gl_context *ctx, GLuint facing);
/* 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( struct gl_context *ctx, const SWvertex *v );
extern void
_swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 );
extern void
_swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
const SWvertex *v1, const SWvertex *v2 );
extern void
_swrast_Quad( struct gl_context *ctx,
const SWvertex *v0, const SWvertex *v1,
const SWvertex *v2, const SWvertex *v3);
extern void
_swrast_flush( struct gl_context *ctx );
extern void
_swrast_render_primitive( struct gl_context *ctx, GLenum mode );
extern void
_swrast_render_start( struct gl_context *ctx );
extern void
_swrast_render_finish( struct gl_context *ctx );
extern struct gl_texture_image *
_swrast_new_texture_image( struct gl_context *ctx );
extern void
_swrast_delete_texture_image(struct gl_context *ctx,
struct gl_texture_image *texImage);
extern GLboolean
_swrast_alloc_texture_image_buffer(struct gl_context *ctx,
struct gl_texture_image *texImage,
gl_format format, GLsizei width,
GLsizei height, GLsizei depth);
extern void
_swrast_free_texture_image_buffer(struct gl_context *ctx,
struct gl_texture_image *texImage);
extern void
_swrast_map_teximage(struct gl_context *ctx,
struct gl_texture_image *texImage,
GLuint slice,
GLuint x, GLuint y, GLuint w, GLuint h,
GLbitfield mode,
GLubyte **mapOut,
GLint *rowStrideOut);
extern void
_swrast_unmap_teximage(struct gl_context *ctx,
struct gl_texture_image *texImage,
GLuint slice);
/* Tell the software rasterizer about core state changes.
*/
extern void
_swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state );
/* Configure software rasterizer to match hardware rasterizer characteristics:
*/
extern void
_swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value );
extern void
_swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value );
/* Debug:
*/
extern void
_swrast_print_vertex( struct gl_context *ctx, const SWvertex *v );
extern void
_swrast_eject_texture_images(struct gl_context *ctx);
extern void
_swrast_render_texture(struct gl_context *ctx,
struct gl_framebuffer *fb,
struct gl_renderbuffer_attachment *att);
extern void
_swrast_finish_render_texture(struct gl_context *ctx,
struct gl_renderbuffer_attachment *att);
/**
* 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)(struct gl_context *ctx);
void (*SpanRenderFinish)(struct gl_context *ctx);
};
#endif
|
