ReactOS 0.4.15-dev-7931-gfd331f1
txc_fetch_dxtn.c
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1/*
2 * libtxc_dxtn
3 * Version: 1.0
4 *
5 * Copyright (C) 2004 Roland Scheidegger All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25#include <stdio.h>
26#include "txc_dxtn.h"
27
28#define EXP5TO8R(packedcol) \
29 ((((packedcol) >> 8) & 0xf8) | (((packedcol) >> 13) & 0x7))
30
31#define EXP6TO8G(packedcol) \
32 ((((packedcol) >> 3) & 0xfc) | (((packedcol) >> 9) & 0x3))
33
34#define EXP5TO8B(packedcol) \
35 ((((packedcol) << 3) & 0xf8) | (((packedcol) >> 2) & 0x7))
36
37#define EXP4TO8(col) \
38 ((col) | ((col) << 4))
39
40/* inefficient. To be efficient, it would be necessary to decode 16 pixels at once */
41
42static void dxt135_decode_imageblock ( const GLubyte *img_block_src,
43 GLint i, GLint j, GLuint dxt_type, GLvoid *texel ) {
44 GLchan *rgba = (GLchan *) texel;
45 const GLushort color0 = img_block_src[0] | (img_block_src[1] << 8);
46 const GLushort color1 = img_block_src[2] | (img_block_src[3] << 8);
47 const GLuint bits = img_block_src[4] | (img_block_src[5] << 8) |
48 (img_block_src[6] << 16) | (img_block_src[7] << 24);
49 /* What about big/little endian? */
50 GLubyte bit_pos = 2 * (j * 4 + i) ;
51 GLubyte code = (GLubyte) ((bits >> bit_pos) & 3);
52
53 rgba[ACOMP] = CHAN_MAX;
54 switch (code) {
55 case 0:
56 rgba[RCOMP] = UBYTE_TO_CHAN( EXP5TO8R(color0) );
57 rgba[GCOMP] = UBYTE_TO_CHAN( EXP6TO8G(color0) );
58 rgba[BCOMP] = UBYTE_TO_CHAN( EXP5TO8B(color0) );
59 break;
60 case 1:
61 rgba[RCOMP] = UBYTE_TO_CHAN( EXP5TO8R(color1) );
62 rgba[GCOMP] = UBYTE_TO_CHAN( EXP6TO8G(color1) );
63 rgba[BCOMP] = UBYTE_TO_CHAN( EXP5TO8B(color1) );
64 break;
65 case 2:
66 if ((dxt_type > 1) || (color0 > color1)) {
67 rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) * 2 + EXP5TO8R(color1)) / 3) );
68 rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) * 2 + EXP6TO8G(color1)) / 3) );
69 rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) * 2 + EXP5TO8B(color1)) / 3) );
70 }
71 else {
72 rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) + EXP5TO8R(color1)) / 2) );
73 rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) + EXP6TO8G(color1)) / 2) );
74 rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) + EXP5TO8B(color1)) / 2) );
75 }
76 break;
77 case 3:
78 if ((dxt_type > 1) || (color0 > color1)) {
79 rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) + EXP5TO8R(color1) * 2) / 3) );
80 rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) + EXP6TO8G(color1) * 2) / 3) );
81 rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) + EXP5TO8B(color1) * 2) / 3) );
82 }
83 else {
84 rgba[RCOMP] = 0;
85 rgba[GCOMP] = 0;
86 rgba[BCOMP] = 0;
87 if (dxt_type == 1) rgba[ACOMP] = UBYTE_TO_CHAN(0);
88 }
89 break;
90 default:
91 /* CANNOT happen (I hope) */
92 break;
93 }
94}
95
96
97void fetch_2d_texel_rgb_dxt1(GLint srcRowStride, const GLubyte *pixdata,
98 GLint i, GLint j, GLvoid *texel)
99{
100 /* Extract the (i,j) pixel from pixdata and return it
101 * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
102 */
103
104 const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 8);
105 dxt135_decode_imageblock(blksrc, (i&3), (j&3), 0, texel);
106}
107
108
110 GLint i, GLint j, GLvoid *texel)
111{
112 /* Extract the (i,j) pixel from pixdata and return it
113 * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
114 */
115
116 const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 8);
117 dxt135_decode_imageblock(blksrc, (i&3), (j&3), 1, texel);
118}
119
121 GLint i, GLint j, GLvoid *texel) {
122
123 /* Extract the (i,j) pixel from pixdata and return it
124 * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
125 */
126
127 GLchan *rgba = (GLchan *) texel;
128 const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 16);
129#if 0
130 /* Simple 32bit version. */
131/* that's pretty brain-dead for a single pixel, isn't it? */
132 const GLubyte bit_pos = 4 * ((j&3) * 4 + (i&3));
133 const GLuint alpha_low = blksrc[0] | (blksrc[1] << 8) | (blksrc[2] << 16) | (blksrc[3] << 24);
134 const GLuint alpha_high = blksrc[4] | (blksrc[5] << 8) | (blksrc[6] << 16) | (blksrc[7] << 24);
135
136 dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel);
137 if (bit_pos < 32)
138 rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8((alpha_low >> bit_pos) & 15)) );
139 else
140 rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8((alpha_high >> (bit_pos - 32)) & 15)) );
141#endif
142#if 1
143/* TODO test this! */
144 const GLubyte anibble = (blksrc[((j&3) * 4 + (i&3)) / 2] >> (4 * (i&1))) & 0xf;
145 dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel);
146 rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8(anibble)) );
147#endif
148
149}
150
152 GLint i, GLint j, GLvoid *texel) {
153
154 /* Extract the (i,j) pixel from pixdata and return it
155 * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
156 */
157
158 GLchan *rgba = (GLchan *) texel;
159 const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 16);
160 const GLubyte alpha0 = blksrc[0];
161 const GLubyte alpha1 = blksrc[1];
162#if 0
163 const GLubyte bit_pos = 3 * ((j&3) * 4 + (i&3));
164 /* simple 32bit version */
165 const GLuint bits_low = blksrc[2] | (blksrc[3] << 8) | (blksrc[4] << 16) | (blksrc[5] << 24);
166 const GLuint bits_high = blksrc[6] | (blksrc[7] << 8);
168
169 if (bit_pos < 30)
170 code = (GLubyte) ((bits_low >> bit_pos) & 7);
171 else if (bit_pos == 30)
172 code = (GLubyte) ((bits_low >> 30) & 3) | ((bits_high << 2) & 4);
173 else
174 code = (GLubyte) ((bits_high >> (bit_pos - 32)) & 7);
175#endif
176#if 1
177/* TODO test this! */
178 const GLubyte bit_pos = ((j&3) * 4 + (i&3)) * 3;
179 const GLubyte acodelow = blksrc[2 + bit_pos / 8];
180 const GLubyte acodehigh = blksrc[3 + bit_pos / 8];
181 const GLubyte code = (acodelow >> (bit_pos & 0x7) |
182 (acodehigh << (8 - (bit_pos & 0x7)))) & 0x7;
183#endif
184 dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel);
185#if 0
186 if (alpha0 > alpha1) {
187 switch (code) {
188 case 0:
189 rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 );
190 break;
191 case 1:
192 rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 );
193 break;
194 case 2:
195 case 3:
196 case 4:
197 case 5:
198 case 6:
199 case 7:
200 rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (8 - code) + (alpha1 * (code - 1))) / 7) );
201 break;
202 }
203 }
204 else {
205 switch (code) {
206 case 0:
207 rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 );
208 break;
209 case 1:
210 rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 );
211 break;
212 case 2:
213 case 3:
214 case 4:
215 case 5:
216 rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5) );
217 break;
218 case 6:
219 rgba[ACOMP] = 0;
220 break;
221 case 7:
222 rgba[ACOMP] = CHAN_MAX;
223 break;
224 }
225 }
226#endif
227/* not sure. Which version is faster? */
228#if 1
229/* TODO test this */
230 if (code == 0)
231 rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 );
232 else if (code == 1)
233 rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 );
234 else if (alpha0 > alpha1)
235 rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (8 - code) + (alpha1 * (code - 1))) / 7) );
236 else if (code < 6)
237 rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5) );
238 else if (code == 6)
239 rgba[ACOMP] = 0;
240 else
241 rgba[ACOMP] = CHAN_MAX;
242#endif
243}
#define ACOMP
Definition: txc_dxtn.h:36
#define BCOMP
Definition: txc_dxtn.h:35
#define RCOMP
Definition: txc_dxtn.h:33
#define CHAN_MAX
Definition: txc_dxtn.h:32
GLubyte GLchan
Definition: txc_dxtn.h:30
#define UBYTE_TO_CHAN(b)
Definition: txc_dxtn.h:31
#define GCOMP
Definition: txc_dxtn.h:34
#define EXP4TO8(col)
void fetch_2d_texel_rgba_dxt3(GLint srcRowStride, const GLubyte *pixdata, GLint i, GLint j, GLvoid *texel)
#define EXP5TO8R(packedcol)
void fetch_2d_texel_rgb_dxt1(GLint srcRowStride, const GLubyte *pixdata, GLint i, GLint j, GLvoid *texel)
void fetch_2d_texel_rgba_dxt1(GLint srcRowStride, const GLubyte *pixdata, GLint i, GLint j, GLvoid *texel)
#define EXP6TO8G(packedcol)
void fetch_2d_texel_rgba_dxt5(GLint srcRowStride, const GLubyte *pixdata, GLint i, GLint j, GLvoid *texel)
static void dxt135_decode_imageblock(const GLubyte *img_block_src, GLint i, GLint j, GLuint dxt_type, GLvoid *texel)
#define EXP5TO8B(packedcol)
unsigned char GLubyte
Definition: gl.h:157
unsigned int GLuint
Definition: gl.h:159
unsigned short GLushort
Definition: gl.h:158
int GLint
Definition: gl.h:156
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint GLint GLint j
Definition: glfuncs.h:250
static const unsigned char pixdata[]
Definition: surface.c:101
Definition: inflate.c:139