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
|
/**************************************************************************
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
**************************************************************************/
/**
* 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 "teximage.h"
#include "texpal.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);
}
}
static const struct cpal_format_info *
cpal_get_info(GLint level, GLenum internalFormat,
GLsizei width, GLsizei height, GLsizei imageSize)
{
const struct cpal_format_info *info;
GLint lvl, num_levels;
GLsizei w, h, expect_size;
info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
ASSERT(info->cpal_format == internalFormat);
if (level > 0) {
_mesa_error(_mesa_get_current_context(), GL_INVALID_VALUE,
"glCompressedTexImage2D(level=%d)", level);
return NULL;
}
num_levels = -level + 1;
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;
}
if (expect_size > imageSize) {
_mesa_error(_mesa_get_current_context(), GL_INVALID_VALUE,
"glCompressedTexImage2D(imageSize=%d)", imageSize);
return NULL;
}
return info;
}
/**
* 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);
info = cpal_get_info(level, internalFormat, width, height, imageSize);
if (!info)
return;
info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
ASSERT(info->cpal_format == internalFormat);
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
|
