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
|
/*
* Mesa 3-D graphics library
* Version: 4.0.3
*
* Copyright (C) 1999-2002 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.
*/
/*
* Mesa Off-Screen rendering interface.
*
* This is an operating system and window system independent interface to
* Mesa which allows one to render images into a client-supplied buffer in
* main memory. Such images may manipulated or saved in whatever way the
* client wants.
*
* These are the API functions:
* OSMesaCreateContext - create a new Off-Screen Mesa rendering context
* OSMesaMakeCurrent - bind an OSMesaContext to a client's image buffer
* and make the specified context the current one.
* OSMesaDestroyContext - destroy an OSMesaContext
* OSMesaGetCurrentContext - return thread's current context ID
* OSMesaPixelStore - controls how pixels are stored in image buffer
* OSMesaGetIntegerv - return OSMesa state parameters
*
*
* The limits on the width and height of an image buffer are MAX_WIDTH and
* MAX_HEIGHT as defined in Mesa/src/config.h. Defaults are 1280 and 1024.
* You can increase them as needed but beware that many temporary arrays in
* Mesa are dimensioned by MAX_WIDTH or MAX_HEIGHT.
*/
#ifndef OSMESA_H
#define OSMESA_H
#ifdef __cplusplus
extern "C" {
#endif
#include <GL/gl.h>
#define OSMESA_MAJOR_VERSION 4
#define OSMESA_MINOR_VERSION 0
#define OSMESA_PATCH_VERSION 3
/*
* Values for the format parameter of OSMesaCreateContext()
* New in version 2.0.
*/
#define OSMESA_COLOR_INDEX GL_COLOR_INDEX
#define OSMESA_RGBA GL_RGBA
#define OSMESA_BGRA 0x1
#define OSMESA_ARGB 0x2
#define OSMESA_RGB GL_RGB
#define OSMESA_BGR 0x4
#define OSMESA_RGB_565 0x5
/*
* OSMesaPixelStore() parameters:
* New in version 2.0.
*/
#define OSMESA_ROW_LENGTH 0x10
#define OSMESA_Y_UP 0x11
/*
* Accepted by OSMesaGetIntegerv:
*/
#define OSMESA_WIDTH 0x20
#define OSMESA_HEIGHT 0x21
#define OSMESA_FORMAT 0x22
#define OSMESA_TYPE 0x23
#define OSMESA_MAX_WIDTH 0x24 /* new in 4.0 */
#define OSMESA_MAX_HEIGHT 0x25 /* new in 4.0 */
typedef struct osmesa_context *OSMesaContext;
#if defined(__BEOS__) || defined(__QUICKDRAW__)
#pragma export on
#endif
/*
* Create an Off-Screen Mesa rendering context. The only attribute needed is
* an RGBA vs Color-Index mode flag.
*
* Input: format - one of OSMESA_COLOR_INDEX, OSMESA_RGBA, OSMESA_BGRA,
* OSMESA_ARGB, OSMESA_RGB, or OSMESA_BGR.
* sharelist - specifies another OSMesaContext with which to share
* display lists. NULL indicates no sharing.
* Return: an OSMesaContext or 0 if error
*/
GLAPI OSMesaContext GLAPIENTRY
OSMesaCreateContext( GLenum format, OSMesaContext sharelist );
/*
* Create an Off-Screen Mesa rendering context and specify desired
* size of depth buffer, stencil buffer and accumulation buffer.
* If you specify zero for depthBits, stencilBits, accumBits you
* can save some memory.
*
* New in Mesa 3.5
*/
GLAPI OSMesaContext GLAPIENTRY
OSMesaCreateContextExt( GLenum format, GLint depthBits, GLint stencilBits,
GLint accumBits, OSMesaContext sharelist);
/*
* Destroy an Off-Screen Mesa rendering context.
*
* Input: ctx - the context to destroy
*/
GLAPI void GLAPIENTRY
OSMesaDestroyContext( OSMesaContext ctx );
/*
* Bind an OSMesaContext to an image buffer. The image buffer is just a
* block of memory which the client provides. Its size must be at least
* as large as width*height*sizeof(type). Its address should be a multiple
* of 4 if using RGBA mode.
*
* Image data is stored in the order of glDrawPixels: row-major order
* with the lower-left image pixel stored in the first array position
* (ie. bottom-to-top).
*
* Since the only type initially supported is GL_UNSIGNED_BYTE, if the
* context is in RGBA mode, each pixel will be stored as a 4-byte RGBA
* value. If the context is in color indexed mode, each pixel will be
* stored as a 1-byte value.
*
* If the context's viewport hasn't been initialized yet, it will now be
* initialized to (0,0,width,height).
*
* Input: ctx - the rendering context
* buffer - the image buffer memory
* type - data type for pixel components, only GL_UNSIGNED_BYTE
* supported now
* width, height - size of image buffer in pixels, at least 1
* Return: GL_TRUE if success, GL_FALSE if error because of invalid ctx,
* invalid buffer address, type!=GL_UNSIGNED_BYTE, width<1, height<1,
* width>internal limit or height>internal limit.
*/
GLAPI GLboolean GLAPIENTRY
OSMesaMakeCurrent( OSMesaContext ctx, void *buffer, GLenum type,
GLsizei width, GLsizei height );
/*
* Return the current Off-Screen Mesa rendering context handle.
*/
GLAPI OSMesaContext GLAPIENTRY
OSMesaGetCurrentContext( void );
/*
* Set pixel store/packing parameters for the current context.
* This is similar to glPixelStore.
* Input: pname - OSMESA_ROW_LENGTH
* specify actual pixels per row in image buffer
* 0 = same as image width (default)
* OSMESA_Y_UP
* zero = Y coordinates increase downward
* non-zero = Y coordinates increase upward (default)
* value - the value for the parameter pname
*
* New in version 2.0.
*/
GLAPI void GLAPIENTRY
OSMesaPixelStore( GLint pname, GLint value );
/*
* Return an integer value like glGetIntegerv.
* Input: pname -
* OSMESA_WIDTH return current image width
* OSMESA_HEIGHT return current image height
* OSMESA_FORMAT return image format
* OSMESA_TYPE return color component data type
* OSMESA_ROW_LENGTH return row length in pixels
* OSMESA_Y_UP returns 1 or 0 to indicate Y axis direction
* value - pointer to integer in which to return result.
*/
GLAPI void GLAPIENTRY
OSMesaGetIntegerv( GLint pname, GLint *value );
/*
* Return the depth buffer associated with an OSMesa context.
* Input: c - the OSMesa context
* Output: width, height - size of buffer in pixels
* bytesPerValue - bytes per depth value (2 or 4)
* buffer - pointer to depth buffer values
* Return: GL_TRUE or GL_FALSE to indicate success or failure.
*
* New in Mesa 2.4.
*/
GLAPI GLboolean GLAPIENTRY
OSMesaGetDepthBuffer( OSMesaContext c, GLint *width, GLint *height,
GLint *bytesPerValue, void **buffer );
/*
* Return the color buffer associated with an OSMesa context.
* Input: c - the OSMesa context
* Output: width, height - size of buffer in pixels
* format - buffer format (OSMESA_FORMAT)
* buffer - pointer to depth buffer values
* Return: GL_TRUE or GL_FALSE to indicate success or failure.
*
* New in Mesa 3.3.
*/
GLAPI GLboolean GLAPIENTRY
OSMesaGetColorBuffer( OSMesaContext c, GLint *width, GLint *height,
GLint *format, void **buffer );
#if defined(__BEOS__) || defined(__QUICKDRAW__)
#pragma export off
#endif
#ifdef __cplusplus
}
#endif
#endif
|
