ReactOS 0.4.15-dev-8428-g6910fa6
txc_fetch_dxtn.c
Go to the documentation of this file.
1#ifdef __REACTOS__
2#include "precomp.h"
3#else
4/*
5 * libtxc_dxtn
6 * Version: 1.0
7 *
8 * Copyright (C) 2004 Roland Scheidegger All Rights Reserved.
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included
18 * in all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
24 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
25 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28#include <stdio.h>
29#include "txc_dxtn.h"
30#endif /* __REACTOS__ */
31
32#define EXP5TO8R(packedcol) \
33 ((((packedcol) >> 8) & 0xf8) | (((packedcol) >> 13) & 0x7))
34
35#define EXP6TO8G(packedcol) \
36 ((((packedcol) >> 3) & 0xfc) | (((packedcol) >> 9) & 0x3))
37
38#define EXP5TO8B(packedcol) \
39 ((((packedcol) << 3) & 0xf8) | (((packedcol) >> 2) & 0x7))
40
41#define EXP4TO8(col) \
42 ((col) | ((col) << 4))
43
44/* inefficient. To be efficient, it would be necessary to decode 16 pixels at once */
45
46static void dxt135_decode_imageblock ( const GLubyte *img_block_src,
47 GLint i, GLint j, GLuint dxt_type, GLvoid *texel ) {
48 GLchan *rgba = (GLchan *) texel;
49 const GLushort color0 = img_block_src[0] | (img_block_src[1] << 8);
50 const GLushort color1 = img_block_src[2] | (img_block_src[3] << 8);
51 const GLuint bits = img_block_src[4] | (img_block_src[5] << 8) |
52 (img_block_src[6] << 16) | (img_block_src[7] << 24);
53 /* What about big/little endian? */
54 GLubyte bit_pos = 2 * (j * 4 + i) ;
55 GLubyte code = (GLubyte) ((bits >> bit_pos) & 3);
56
57 rgba[ACOMP] = CHAN_MAX;
58 switch (code) {
59 case 0:
60 rgba[RCOMP] = UBYTE_TO_CHAN( EXP5TO8R(color0) );
61 rgba[GCOMP] = UBYTE_TO_CHAN( EXP6TO8G(color0) );
62 rgba[BCOMP] = UBYTE_TO_CHAN( EXP5TO8B(color0) );
63 break;
64 case 1:
65 rgba[RCOMP] = UBYTE_TO_CHAN( EXP5TO8R(color1) );
66 rgba[GCOMP] = UBYTE_TO_CHAN( EXP6TO8G(color1) );
67 rgba[BCOMP] = UBYTE_TO_CHAN( EXP5TO8B(color1) );
68 break;
69 case 2:
70 if ((dxt_type > 1) || (color0 > color1)) {
71 rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) * 2 + EXP5TO8R(color1)) / 3) );
72 rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) * 2 + EXP6TO8G(color1)) / 3) );
73 rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) * 2 + EXP5TO8B(color1)) / 3) );
74 }
75 else {
76 rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) + EXP5TO8R(color1)) / 2) );
77 rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) + EXP6TO8G(color1)) / 2) );
78 rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) + EXP5TO8B(color1)) / 2) );
79 }
80 break;
81 case 3:
82 if ((dxt_type > 1) || (color0 > color1)) {
83 rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) + EXP5TO8R(color1) * 2) / 3) );
84 rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) + EXP6TO8G(color1) * 2) / 3) );
85 rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) + EXP5TO8B(color1) * 2) / 3) );
86 }
87 else {
88 rgba[RCOMP] = 0;
89 rgba[GCOMP] = 0;
90 rgba[BCOMP] = 0;
91 if (dxt_type == 1) rgba[ACOMP] = UBYTE_TO_CHAN(0);
92 }
93 break;
94 default:
95 /* CANNOT happen (I hope) */
96 break;
97 }
98}
99
100
102 GLint i, GLint j, GLvoid *texel)
103{
104 /* Extract the (i,j) pixel from pixdata and return it
105 * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
106 */
107
108 const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 8);
109 dxt135_decode_imageblock(blksrc, (i&3), (j&3), 0, texel);
110}
111
112
114 GLint i, GLint j, GLvoid *texel)
115{
116 /* Extract the (i,j) pixel from pixdata and return it
117 * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
118 */
119
120 const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 8);
121 dxt135_decode_imageblock(blksrc, (i&3), (j&3), 1, texel);
122}
123
125 GLint i, GLint j, GLvoid *texel) {
126
127 /* Extract the (i,j) pixel from pixdata and return it
128 * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
129 */
130
131 GLchan *rgba = (GLchan *) texel;
132 const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 16);
133#if 0
134 /* Simple 32bit version. */
135/* that's pretty brain-dead for a single pixel, isn't it? */
136 const GLubyte bit_pos = 4 * ((j&3) * 4 + (i&3));
137 const GLuint alpha_low = blksrc[0] | (blksrc[1] << 8) | (blksrc[2] << 16) | (blksrc[3] << 24);
138 const GLuint alpha_high = blksrc[4] | (blksrc[5] << 8) | (blksrc[6] << 16) | (blksrc[7] << 24);
139
140 dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel);
141 if (bit_pos < 32)
142 rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8((alpha_low >> bit_pos) & 15)) );
143 else
144 rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8((alpha_high >> (bit_pos - 32)) & 15)) );
145#endif
146#if 1
147/* TODO test this! */
148 const GLubyte anibble = (blksrc[((j&3) * 4 + (i&3)) / 2] >> (4 * (i&1))) & 0xf;
149 dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel);
150 rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8(anibble)) );
151#endif
152
153}
154
156 GLint i, GLint j, GLvoid *texel) {
157
158 /* Extract the (i,j) pixel from pixdata and return it
159 * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
160 */
161
162 GLchan *rgba = (GLchan *) texel;
163 const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 16);
164 const GLubyte alpha0 = blksrc[0];
165 const GLubyte alpha1 = blksrc[1];
166#if 0
167 const GLubyte bit_pos = 3 * ((j&3) * 4 + (i&3));
168 /* simple 32bit version */
169 const GLuint bits_low = blksrc[2] | (blksrc[3] << 8) | (blksrc[4] << 16) | (blksrc[5] << 24);
170 const GLuint bits_high = blksrc[6] | (blksrc[7] << 8);
172
173 if (bit_pos < 30)
174 code = (GLubyte) ((bits_low >> bit_pos) & 7);
175 else if (bit_pos == 30)
176 code = (GLubyte) ((bits_low >> 30) & 3) | ((bits_high << 2) & 4);
177 else
178 code = (GLubyte) ((bits_high >> (bit_pos - 32)) & 7);
179#endif
180#if 1
181/* TODO test this! */
182 const GLubyte bit_pos = ((j&3) * 4 + (i&3)) * 3;
183 const GLubyte acodelow = blksrc[2 + bit_pos / 8];
184 const GLubyte acodehigh = blksrc[3 + bit_pos / 8];
185 const GLubyte code = (acodelow >> (bit_pos & 0x7) |
186 (acodehigh << (8 - (bit_pos & 0x7)))) & 0x7;
187#endif
188 dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel);
189#if 0
190 if (alpha0 > alpha1) {
191 switch (code) {
192 case 0:
193 rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 );
194 break;
195 case 1:
196 rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 );
197 break;
198 case 2:
199 case 3:
200 case 4:
201 case 5:
202 case 6:
203 case 7:
204 rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (8 - code) + (alpha1 * (code - 1))) / 7) );
205 break;
206 }
207 }
208 else {
209 switch (code) {
210 case 0:
211 rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 );
212 break;
213 case 1:
214 rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 );
215 break;
216 case 2:
217 case 3:
218 case 4:
219 case 5:
220 rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5) );
221 break;
222 case 6:
223 rgba[ACOMP] = 0;
224 break;
225 case 7:
226 rgba[ACOMP] = CHAN_MAX;
227 break;
228 }
229 }
230#endif
231/* not sure. Which version is faster? */
232#if 1
233/* TODO test this */
234 if (code == 0)
235 rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 );
236 else if (code == 1)
237 rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 );
238 else if (alpha0 > alpha1)
239 rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (8 - code) + (alpha1 * (code - 1))) / 7) );
240 else if (code < 6)
241 rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5) );
242 else if (code == 6)
243 rgba[ACOMP] = 0;
244 else
245 rgba[ACOMP] = CHAN_MAX;
246#endif
247}
#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