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
|
/*
* Mesa 3-D graphics library
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
*
* 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
* THE AUTHORS 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.
*/
/**
* Code to convert compressed/paletted texture images to ordinary images.
* See the GL_OES_compressed_paletted_texture spec at
* http://khronos.org/registry/gles/extensions/OES/OES_compressed_paletted_texture.txt
*
* XXX this makes it impossible to add hardware support...
*/
#include "glheader.h"
#include "compiler.h" /* for ASSERT */
#include "context.h"
#include "mfeatures.h"
#include "mtypes.h"
#include "imports.h"
#include "pixelstore.h"
#include "texcompress_cpal.h"
#include "teximage.h"
#if FEATURE_ES
static const struct cpal_format_info {
GLenum cpal_format;
GLenum format;
GLenum type;
GLuint palette_size;
GLuint size;
} formats[] = {
{ GL_PALETTE4_RGB8_OES, GL_RGB, GL_UNSIGNED_BYTE, 16, 3 },
{ GL_PALETTE4_RGBA8_OES, GL_RGBA, GL_UNSIGNED_BYTE, 16, 4 },
{ GL_PALETTE4_R5_G6_B5_OES, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 16, 2 },
{ GL_PALETTE4_RGBA4_OES, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 16, 2 },
{ GL_PALETTE4_RGB5_A1_OES, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 16, 2 },
{ GL_PALETTE8_RGB8_OES, GL_RGB, GL_UNSIGNED_BYTE, 256, 3 },
{ GL_PALETTE8_RGBA8_OES, GL_RGBA, GL_UNSIGNED_BYTE, 256, 4 },
{ GL_PALETTE8_R5_G6_B5_OES, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 256, 2 },
{ GL_PALETTE8_RGBA4_OES, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 256, 2 },
{ GL_PALETTE8_RGB5_A1_OES, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 256, 2 }
};
/**
* Get a color/entry from the palette.
*/
static GLuint
get_palette_entry(const struct cpal_format_info *info, const GLubyte *palette,
GLuint index, GLubyte *pixel)
{
memcpy(pixel, palette + info->size * index, info->size);
return info->size;
}
/**
* Convert paletted texture to color texture.
*/
static void
paletted_to_color(const struct cpal_format_info *info, const GLubyte *palette,
const void *indices, GLuint num_pixels, GLubyte *image)
{
GLubyte *pix = image;
GLuint remain, i;
if (info->palette_size == 16) {
/* 4 bits per index */
const GLubyte *ind = (const GLubyte *) indices;
/* two pixels per iteration */
remain = num_pixels % 2;
for (i = 0; i < num_pixels / 2; i++) {
pix += get_palette_entry(info, palette, (ind[i] >> 4) & 0xf, pix);
pix += get_palette_entry(info, palette, ind[i] & 0xf, pix);
}
if (remain) {
get_palette_entry(info, palette, (ind[i] >> 4) & 0xf, pix);
}
}
else {
/* 8 bits per index */
const GLubyte *ind = (const GLubyte *) indices;
for (i = 0; i < num_pixels; i++)
pix += get_palette_entry(info, palette, ind[i], pix);
}
}
unsigned
_mesa_cpal_compressed_size(int level, GLenum internalFormat,
unsigned width, unsigned height)
{
const struct cpal_format_info *info;
const int num_levels = -level + 1;
int lvl;
unsigned w, h, expect_size;
if (internalFormat < GL_PALETTE4_RGB8_OES
|| internalFormat > GL_PALETTE8_RGB5_A1_OES) {
return 0;
}
info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
ASSERT(info->cpal_format == internalFormat);
expect_size = info->palette_size * info->size;
for (lvl = 0; lvl < num_levels; lvl++) {
w = width >> lvl;
if (!w)
w = 1;
h = height >> lvl;
if (!h)
h = 1;
if (info->palette_size == 16)
expect_size += (w * h + 1) / 2;
else
expect_size += w * h;
}
return expect_size;
}
void
_mesa_cpal_compressed_format_type(GLenum internalFormat, GLenum *format,
GLenum *type)
{
const struct cpal_format_info *info;
if (internalFormat < GL_PALETTE4_RGB8_OES
|| internalFormat > GL_PALETTE8_RGB5_A1_OES) {
return;
}
info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
*format = info->format;
*type = info->type;
}
/**
* Convert a call to glCompressedTexImage2D() where internalFormat is a
* compressed palette format into a regular GLubyte/RGBA glTexImage2D() call.
*/
void
_mesa_cpal_compressed_teximage2d(GLenum target, GLint level,
GLenum internalFormat,
GLsizei width, GLsizei height,
GLsizei imageSize, const void *palette)
{
const struct cpal_format_info *info;
GLint lvl, num_levels;
const GLubyte *indices;
GLint saved_align, align;
GET_CURRENT_CONTEXT(ctx);
/* By this point, the internalFormat should have been validated.
*/
assert(internalFormat >= GL_PALETTE4_RGB8_OES
&& internalFormat <= GL_PALETTE8_RGB5_A1_OES);
info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
num_levels = -level + 1;
/* first image follows the palette */
indices = (const GLubyte *) palette + info->palette_size * info->size;
saved_align = ctx->Unpack.Alignment;
align = saved_align;
for (lvl = 0; lvl < num_levels; lvl++) {
GLsizei w, h;
GLuint num_texels;
GLubyte *image = NULL;
w = width >> lvl;
if (!w)
w = 1;
h = height >> lvl;
if (!h)
h = 1;
num_texels = w * h;
if (w * info->size % align) {
_mesa_PixelStorei(GL_UNPACK_ALIGNMENT, 1);
align = 1;
}
/* allocate and fill dest image buffer */
if (palette) {
image = (GLubyte *) malloc(num_texels * info->size);
paletted_to_color(info, palette, indices, num_texels, image);
}
_mesa_TexImage2D(target, lvl, info->format, w, h, 0,
info->format, info->type, image);
if (image)
free(image);
/* advance index pointer to point to next src mipmap */
if (info->palette_size == 16)
indices += (num_texels + 1) / 2;
else
indices += num_texels;
}
if (saved_align != align)
_mesa_PixelStorei(GL_UNPACK_ALIGNMENT, saved_align);
}
#endif
|
