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
|
/* -*- mode: C; c-basic-offset:8 -*- */
/*
* GLX Hardware Device Driver for Matrox Millenium G200
* Copyright (C) 1999 Wittawat Yamwong
*
* 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
* WITTAWAT YAMWONG, OR ANY OTHER CONTRIBUTORS 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.
*
*
* original by Wittawat Yamwong <Wittawat.Yamwong@stud.uni-hannover.de>
* 9/20/99 rewrite by John Carmack <johnc@idsoftware.com>
*/
#include <stdlib.h>
#include <stdio.h>
#include <GL/gl.h>
#include "mm.h"
#include "mgalib.h"
#include "mgatex.h"
/*
* mgaConvertTexture
* Converts a mesa format texture to the apropriate hardware format
* Note that sometimes width may be larger than the texture, like 64x1
* for an 8x8 texture. This happens when we have to crutch the pitch
* limits of the mga by uploading a block of texels as a single line.
*/
void mgaConvertTexture( mgaUI32 *destPtr, int texelBytes,
struct gl_texture_image *image,
int x, int y, int width, int height )
{
register int i, j;
mgaUI8 *src;
int stride;
/* FIXME: g400 luminance_alpha internal format */
switch (texelBytes) {
case 1:
switch (image->Format) {
case GL_COLOR_INDEX:
case GL_INTENSITY:
case GL_LUMINANCE:
case GL_ALPHA:
src = (mgaUI8 *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width >> 2 ; j ; j-- ) {
*destPtr++ = src[0] | ( src[1] << 8 ) | ( src[2] << 16 ) | ( src[3] << 24 );
src += 4;
}
src += stride;
}
break;
default:
goto format_error;
}
break;
case 2:
switch (image->Format) {
case GL_RGB:
src = (mgaUI8 *)image->Data + ( y * image->Width + x ) * 3;
stride = (image->Width - width) * 3;
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR565(src[0],src[1],src[2]) |
( MGAPACKCOLOR565(src[3],src[4],src[5]) << 16 );
src += 6;
}
src += stride;
}
break;
case GL_RGBA:
src = (mgaUI8 *)image->Data + ( y * image->Width + x ) * 4;
stride = (image->Width - width) * 4;
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR4444(src[0],src[1],src[2],src[3]) |
( MGAPACKCOLOR4444(src[4],src[5],src[6],src[7]) << 16 );
src += 8;
}
src += stride;
}
break;
case GL_LUMINANCE:
src = (mgaUI8 *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
/* FIXME: should probably use 555 texture to get true grey */
*destPtr++ = MGAPACKCOLOR565(src[0],src[0],src[0]) |
( MGAPACKCOLOR565(src[1],src[1],src[1]) << 16 );
src += 2;
}
src += stride;
}
break;
case GL_INTENSITY:
src = (mgaUI8 *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR4444(src[0],src[0],src[0],src[0]) |
( MGAPACKCOLOR4444(src[1],src[1],src[1],src[1]) << 16 );
src += 2;
}
src += stride;
}
break;
case GL_ALPHA:
src = (mgaUI8 *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR4444(255,255,255,src[0]) |
( MGAPACKCOLOR4444(255,255,255,src[1]) << 16 );
src += 2;
}
src += stride;
}
break;
case GL_LUMINANCE_ALPHA:
src = (mgaUI8 *)image->Data + ( y * image->Width + x ) * 2;
stride = (image->Width - width) * 2;
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR4444(src[0],src[0],src[0],src[1]) |
( MGAPACKCOLOR4444(src[2],src[2],src[2],src[3]) << 16 );
src += 4;
}
src += stride;
}
break;
default:
goto format_error;
}
break;
case 4:
switch (image->Format) {
case GL_RGB:
src = (mgaUI8 *)image->Data + ( y * image->Width + x ) * 3;
stride = (image->Width - width) * 3;
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[1],src[2], 255);
src += 3;
}
src += stride;
}
break;
case GL_RGBA:
src = (mgaUI8 *)image->Data + ( y * image->Width + x ) * 4;
stride = (image->Width - width) * 4;
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[1],src[2],src[3]);
src += 4;
}
src += stride;
}
break;
case GL_LUMINANCE:
src = (mgaUI8 *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[0],src[0], 255);
src += 1;
}
src += stride;
}
break;
case GL_INTENSITY:
src = (mgaUI8 *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[0],src[0],src[0]);
src += 1;
}
src += stride;
}
break;
case GL_ALPHA:
src = (mgaUI8 *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(255,255,255,src[0]);
src += 1;
}
src += stride;
}
break;
case GL_LUMINANCE_ALPHA:
src = (mgaUI8 *)image->Data + ( y * image->Width + x ) * 2;
stride = (image->Width - width) * 2;
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[0],
src[0],src[1]);
src += 2;
}
src += stride;
}
break;
default:
goto format_error;
}
break;
default:
goto format_error;
}
return;
format_error:
mgaError( "Unsupported texelBytes %i, image->Format %i\n",
(int)texelBytes, (int)image->Format );
}
|
