2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 #include "main/glheader.h"
28 #include "main/context.h"
29 #include "main/colormac.h"
30 #include "main/image.h"
31 #include "main/imports.h"
32 #include "main/macros.h"
33 #include "main/pixel.h"
34 #include "shader/prog_instruction.h"
36 #include "s_context.h"
37 #include "s_texcombine.h"
40 #define PROD(A,B) ( (GLuint)(A) * ((GLuint)(B)+1) )
41 #define S_PROD(A,B) ( (GLint)(A) * ((GLint)(B)+1) )
43 typedef GLfloat ChanTemp
;
45 typedef GLuint ChanTemp
;
50 * Do texture application for GL_ARB/EXT_texture_env_combine.
51 * This function also supports GL_{EXT,ARB}_texture_env_dot3 and
52 * GL_ATI_texture_env_combine3. Since "classic" texture environments are
53 * implemented using GL_ARB_texture_env_combine-like state, this same function
54 * is used for classic texture environment application as well.
56 * \param ctx rendering context
57 * \param textureUnit the texture unit to apply
58 * \param n number of fragments to process (span width)
59 * \param primary_rgba incoming fragment color array
60 * \param texelBuffer pointer to texel colors for all texture units
62 * \param rgba incoming colors, which get modified here
65 texture_combine( const GLcontext
*ctx
, GLuint unit
, GLuint n
,
66 CONST
GLchan (*primary_rgba
)[4],
67 CONST GLchan
*texelBuffer
,
70 const struct gl_texture_unit
*textureUnit
= &(ctx
->Texture
.Unit
[unit
]);
71 const GLchan (*argRGB
[4])[4];
72 const GLchan (*argA
[4])[4];
73 const GLint RGBshift
= textureUnit
->_CurrentCombine
->ScaleShiftRGB
;
74 const GLuint Ashift
= textureUnit
->_CurrentCombine
->ScaleShiftA
;
75 #if CHAN_TYPE == GL_FLOAT
76 const GLchan RGBmult
= (GLfloat
) (1 << RGBshift
);
77 const GLchan Amult
= (GLfloat
) (1 << Ashift
);
79 const GLint half
= (CHAN_MAX
+ 1) / 2;
81 static const GLchan one
[4] = { CHAN_MAX
, CHAN_MAX
, CHAN_MAX
, CHAN_MAX
};
82 static const GLchan zero
[4] = { 0, 0, 0, 0 };
83 const GLuint numColorArgs
= textureUnit
->_CurrentCombine
->_NumArgsRGB
;
84 const GLuint numAlphaArgs
= textureUnit
->_CurrentCombine
->_NumArgsA
;
85 GLchan ccolor
[4][MAX_WIDTH
][4];
88 ASSERT(ctx
->Extensions
.EXT_texture_env_combine
||
89 ctx
->Extensions
.ARB_texture_env_combine
);
90 ASSERT(CONST_SWRAST_CONTEXT(ctx
)->_AnyTextureCombine
);
93 printf("modeRGB 0x%x modeA 0x%x srcRGB1 0x%x srcA1 0x%x srcRGB2 0x%x srcA2 0x%x\n",
94 textureUnit->_CurrentCombine->ModeRGB,
95 textureUnit->_CurrentCombine->ModeA,
96 textureUnit->_CurrentCombine->SourceRGB[0],
97 textureUnit->_CurrentCombine->SourceA[0],
98 textureUnit->_CurrentCombine->SourceRGB[1],
99 textureUnit->_CurrentCombine->SourceA[1]);
103 * Do operand setup for up to 4 operands. Loop over the terms.
105 for (j
= 0; j
< numColorArgs
; j
++) {
106 const GLenum srcRGB
= textureUnit
->_CurrentCombine
->SourceRGB
[j
];
110 argRGB
[j
] = (const GLchan (*)[4])
111 (texelBuffer
+ unit
* (n
* 4 * sizeof(GLchan
)));
113 case GL_PRIMARY_COLOR
:
114 argRGB
[j
] = primary_rgba
;
117 argRGB
[j
] = (const GLchan (*)[4]) rgba
;
121 GLchan (*c
)[4] = ccolor
[j
];
122 GLchan red
, green
, blue
, alpha
;
123 UNCLAMPED_FLOAT_TO_CHAN(red
, textureUnit
->EnvColor
[0]);
124 UNCLAMPED_FLOAT_TO_CHAN(green
, textureUnit
->EnvColor
[1]);
125 UNCLAMPED_FLOAT_TO_CHAN(blue
, textureUnit
->EnvColor
[2]);
126 UNCLAMPED_FLOAT_TO_CHAN(alpha
, textureUnit
->EnvColor
[3]);
127 for (i
= 0; i
< n
; i
++) {
133 argRGB
[j
] = (const GLchan (*)[4]) ccolor
[j
];
136 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
145 /* ARB_texture_env_crossbar source */
147 const GLuint srcUnit
= srcRGB
- GL_TEXTURE0
;
148 ASSERT(srcUnit
< ctx
->Const
.MaxTextureUnits
);
149 if (!ctx
->Texture
.Unit
[srcUnit
]._ReallyEnabled
)
151 argRGB
[j
] = (const GLchan (*)[4])
152 (texelBuffer
+ srcUnit
* (n
* 4 * sizeof(GLchan
)));
156 if (textureUnit
->_CurrentCombine
->OperandRGB
[j
] != GL_SRC_COLOR
) {
157 const GLchan (*src
)[4] = argRGB
[j
];
158 GLchan (*dst
)[4] = ccolor
[j
];
160 /* point to new arg[j] storage */
161 argRGB
[j
] = (const GLchan (*)[4]) ccolor
[j
];
163 if (textureUnit
->_CurrentCombine
->OperandRGB
[j
] == GL_ONE_MINUS_SRC_COLOR
) {
164 for (i
= 0; i
< n
; i
++) {
165 dst
[i
][RCOMP
] = CHAN_MAX
- src
[i
][RCOMP
];
166 dst
[i
][GCOMP
] = CHAN_MAX
- src
[i
][GCOMP
];
167 dst
[i
][BCOMP
] = CHAN_MAX
- src
[i
][BCOMP
];
170 else if (textureUnit
->_CurrentCombine
->OperandRGB
[j
] == GL_SRC_ALPHA
) {
171 for (i
= 0; i
< n
; i
++) {
172 dst
[i
][RCOMP
] = src
[i
][ACOMP
];
173 dst
[i
][GCOMP
] = src
[i
][ACOMP
];
174 dst
[i
][BCOMP
] = src
[i
][ACOMP
];
178 ASSERT(textureUnit
->_CurrentCombine
->OperandRGB
[j
] ==GL_ONE_MINUS_SRC_ALPHA
);
179 for (i
= 0; i
< n
; i
++) {
180 dst
[i
][RCOMP
] = CHAN_MAX
- src
[i
][ACOMP
];
181 dst
[i
][GCOMP
] = CHAN_MAX
- src
[i
][ACOMP
];
182 dst
[i
][BCOMP
] = CHAN_MAX
- src
[i
][ACOMP
];
189 * Set up the argA[i] pointers
191 for (j
= 0; j
< numAlphaArgs
; j
++) {
192 const GLenum srcA
= textureUnit
->_CurrentCombine
->SourceA
[j
];
196 argA
[j
] = (const GLchan (*)[4])
197 (texelBuffer
+ unit
* (n
* 4 * sizeof(GLchan
)));
199 case GL_PRIMARY_COLOR
:
200 argA
[j
] = primary_rgba
;
203 argA
[j
] = (const GLchan (*)[4]) rgba
;
207 GLchan alpha
, (*c
)[4] = ccolor
[j
];
208 UNCLAMPED_FLOAT_TO_CHAN(alpha
, textureUnit
->EnvColor
[3]);
209 for (i
= 0; i
< n
; i
++)
211 argA
[j
] = (const GLchan (*)[4]) ccolor
[j
];
214 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
223 /* ARB_texture_env_crossbar source */
225 const GLuint srcUnit
= srcA
- GL_TEXTURE0
;
226 ASSERT(srcUnit
< ctx
->Const
.MaxTextureUnits
);
227 if (!ctx
->Texture
.Unit
[srcUnit
]._ReallyEnabled
)
229 argA
[j
] = (const GLchan (*)[4])
230 (texelBuffer
+ srcUnit
* (n
* 4 * sizeof(GLchan
)));
234 if (textureUnit
->_CurrentCombine
->OperandA
[j
] == GL_ONE_MINUS_SRC_ALPHA
) {
235 const GLchan (*src
)[4] = argA
[j
];
236 GLchan (*dst
)[4] = ccolor
[j
];
237 argA
[j
] = (const GLchan (*)[4]) ccolor
[j
];
238 for (i
= 0; i
< n
; i
++) {
239 dst
[i
][ACOMP
] = CHAN_MAX
- src
[i
][ACOMP
];
245 * Do the texture combine.
247 switch (textureUnit
->_CurrentCombine
->ModeRGB
) {
250 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
252 for (i
= 0; i
< n
; i
++) {
253 #if CHAN_TYPE == GL_FLOAT
254 rgba
[i
][RCOMP
] = arg0
[i
][RCOMP
] * RGBmult
;
255 rgba
[i
][GCOMP
] = arg0
[i
][GCOMP
] * RGBmult
;
256 rgba
[i
][BCOMP
] = arg0
[i
][BCOMP
] * RGBmult
;
258 GLuint r
= (GLuint
) arg0
[i
][RCOMP
] << RGBshift
;
259 GLuint g
= (GLuint
) arg0
[i
][GCOMP
] << RGBshift
;
260 GLuint b
= (GLuint
) arg0
[i
][BCOMP
] << RGBshift
;
261 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
262 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
263 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
268 for (i
= 0; i
< n
; i
++) {
269 rgba
[i
][RCOMP
] = arg0
[i
][RCOMP
];
270 rgba
[i
][GCOMP
] = arg0
[i
][GCOMP
];
271 rgba
[i
][BCOMP
] = arg0
[i
][BCOMP
];
278 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
279 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
280 #if CHAN_TYPE != GL_FLOAT
281 const GLint shift
= CHAN_BITS
- RGBshift
;
283 for (i
= 0; i
< n
; i
++) {
284 #if CHAN_TYPE == GL_FLOAT
285 rgba
[i
][RCOMP
] = arg0
[i
][RCOMP
] * arg1
[i
][RCOMP
] * RGBmult
;
286 rgba
[i
][GCOMP
] = arg0
[i
][GCOMP
] * arg1
[i
][GCOMP
] * RGBmult
;
287 rgba
[i
][BCOMP
] = arg0
[i
][BCOMP
] * arg1
[i
][BCOMP
] * RGBmult
;
289 GLuint r
= PROD(arg0
[i
][RCOMP
], arg1
[i
][RCOMP
]) >> shift
;
290 GLuint g
= PROD(arg0
[i
][GCOMP
], arg1
[i
][GCOMP
]) >> shift
;
291 GLuint b
= PROD(arg0
[i
][BCOMP
], arg1
[i
][BCOMP
]) >> shift
;
292 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
293 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
294 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
300 if (textureUnit
->EnvMode
== GL_COMBINE4_NV
) {
301 /* (a * b) + (c * d) */
302 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
303 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
304 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
305 const GLchan (*arg3
)[4] = (const GLchan (*)[4]) argRGB
[3];
306 for (i
= 0; i
< n
; i
++) {
307 #if CHAN_TYPE == GL_FLOAT
308 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] * arg1
[i
][RCOMP
] +
309 arg2
[i
][RCOMP
] * arg3
[i
][RCOMP
]) * RGBmult
;
310 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] * arg1
[i
][GCOMP
] +
311 arg2
[i
][GCOMP
] * arg3
[i
][GCOMP
]) * RGBmult
;
312 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] * arg1
[i
][BCOMP
] +
313 arg2
[i
][BCOMP
] * arg3
[i
][BCOMP
]) * RGBmult
;
315 const GLint shift
= CHAN_BITS
- RGBshift
;
316 GLint r
= (PROD(arg0
[i
][RCOMP
], arg1
[i
][RCOMP
]) >> shift
) +
317 (PROD(arg2
[i
][RCOMP
], arg3
[i
][RCOMP
]) >> shift
);
318 GLint g
= (PROD(arg0
[i
][GCOMP
], arg1
[i
][GCOMP
]) >> shift
) +
319 (PROD(arg2
[i
][GCOMP
], arg3
[i
][GCOMP
]) >> shift
);
320 GLint b
= (PROD(arg0
[i
][BCOMP
], arg1
[i
][BCOMP
]) >> shift
) +
321 (PROD(arg2
[i
][BCOMP
], arg3
[i
][BCOMP
]) >> shift
);
322 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
323 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
324 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
329 /* 2-term addition */
330 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
331 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
332 for (i
= 0; i
< n
; i
++) {
333 #if CHAN_TYPE == GL_FLOAT
334 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] + arg1
[i
][RCOMP
]) * RGBmult
;
335 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] + arg1
[i
][GCOMP
]) * RGBmult
;
336 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] + arg1
[i
][BCOMP
]) * RGBmult
;
338 GLint r
= ((GLint
) arg0
[i
][RCOMP
] + (GLint
) arg1
[i
][RCOMP
]) << RGBshift
;
339 GLint g
= ((GLint
) arg0
[i
][GCOMP
] + (GLint
) arg1
[i
][GCOMP
]) << RGBshift
;
340 GLint b
= ((GLint
) arg0
[i
][BCOMP
] + (GLint
) arg1
[i
][BCOMP
]) << RGBshift
;
341 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
342 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
343 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
349 if (textureUnit
->EnvMode
== GL_COMBINE4_NV
) {
350 /* (a * b) + (c * d) - 0.5 */
351 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
352 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
353 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
354 const GLchan (*arg3
)[4] = (const GLchan (*)[4]) argRGB
[3];
355 for (i
= 0; i
< n
; i
++) {
356 #if CHAN_TYPE == GL_FLOAT
357 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] + arg1
[i
][RCOMP
] *
358 arg2
[i
][RCOMP
] + arg3
[i
][RCOMP
] - 0.5) * RGBmult
;
359 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] + arg1
[i
][GCOMP
] *
360 arg2
[i
][GCOMP
] + arg3
[i
][GCOMP
] - 0.5) * RGBmult
;
361 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] + arg1
[i
][BCOMP
] *
362 arg2
[i
][BCOMP
] + arg3
[i
][BCOMP
] - 0.5) * RGBmult
;
364 GLint r
= (((PROD(arg0
[i
][RCOMP
], arg1
[i
][RCOMP
]) +
365 PROD(arg2
[i
][RCOMP
], arg3
[i
][RCOMP
])) >> CHAN_BITS
) - half
)
367 GLint g
= (((PROD(arg0
[i
][GCOMP
], arg1
[i
][GCOMP
]) +
368 PROD(arg2
[i
][GCOMP
], arg3
[i
][GCOMP
])) >> CHAN_BITS
) - half
)
370 GLint b
= (((PROD(arg0
[i
][BCOMP
], arg1
[i
][BCOMP
]) +
371 PROD(arg2
[i
][BCOMP
], arg3
[i
][BCOMP
])) >> CHAN_BITS
) - half
)
373 rgba
[i
][RCOMP
] = (GLchan
) CLAMP(r
, 0, CHAN_MAX
);
374 rgba
[i
][GCOMP
] = (GLchan
) CLAMP(g
, 0, CHAN_MAX
);
375 rgba
[i
][BCOMP
] = (GLchan
) CLAMP(b
, 0, CHAN_MAX
);
380 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
381 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
382 for (i
= 0; i
< n
; i
++) {
383 #if CHAN_TYPE == GL_FLOAT
384 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] + arg1
[i
][RCOMP
] - 0.5) * RGBmult
;
385 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] + arg1
[i
][GCOMP
] - 0.5) * RGBmult
;
386 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] + arg1
[i
][BCOMP
] - 0.5) * RGBmult
;
388 GLint r
= (GLint
) arg0
[i
][RCOMP
] + (GLint
) arg1
[i
][RCOMP
] - half
;
389 GLint g
= (GLint
) arg0
[i
][GCOMP
] + (GLint
) arg1
[i
][GCOMP
] - half
;
390 GLint b
= (GLint
) arg0
[i
][BCOMP
] + (GLint
) arg1
[i
][BCOMP
] - half
;
391 r
= (r
< 0) ? 0 : r
<< RGBshift
;
392 g
= (g
< 0) ? 0 : g
<< RGBshift
;
393 b
= (b
< 0) ? 0 : b
<< RGBshift
;
394 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
395 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
396 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
403 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
404 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
405 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
406 #if CHAN_TYPE != GL_FLOAT
407 const GLint shift
= CHAN_BITS
- RGBshift
;
409 for (i
= 0; i
< n
; i
++) {
410 #if CHAN_TYPE == GL_FLOAT
411 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] * arg2
[i
][RCOMP
] +
412 arg1
[i
][RCOMP
] * (CHAN_MAXF
- arg2
[i
][RCOMP
])) * RGBmult
;
413 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] * arg2
[i
][GCOMP
] +
414 arg1
[i
][GCOMP
] * (CHAN_MAXF
- arg2
[i
][GCOMP
])) * RGBmult
;
415 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] * arg2
[i
][BCOMP
] +
416 arg1
[i
][BCOMP
] * (CHAN_MAXF
- arg2
[i
][BCOMP
])) * RGBmult
;
418 GLuint r
= (PROD(arg0
[i
][RCOMP
], arg2
[i
][RCOMP
])
419 + PROD(arg1
[i
][RCOMP
], CHAN_MAX
- arg2
[i
][RCOMP
]))
421 GLuint g
= (PROD(arg0
[i
][GCOMP
], arg2
[i
][GCOMP
])
422 + PROD(arg1
[i
][GCOMP
], CHAN_MAX
- arg2
[i
][GCOMP
]))
424 GLuint b
= (PROD(arg0
[i
][BCOMP
], arg2
[i
][BCOMP
])
425 + PROD(arg1
[i
][BCOMP
], CHAN_MAX
- arg2
[i
][BCOMP
]))
427 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
428 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
429 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
436 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
437 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
438 for (i
= 0; i
< n
; i
++) {
439 #if CHAN_TYPE == GL_FLOAT
440 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] - arg1
[i
][RCOMP
]) * RGBmult
;
441 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] - arg1
[i
][GCOMP
]) * RGBmult
;
442 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] - arg1
[i
][BCOMP
]) * RGBmult
;
444 GLint r
= ((GLint
) arg0
[i
][RCOMP
] - (GLint
) arg1
[i
][RCOMP
]) << RGBshift
;
445 GLint g
= ((GLint
) arg0
[i
][GCOMP
] - (GLint
) arg1
[i
][GCOMP
]) << RGBshift
;
446 GLint b
= ((GLint
) arg0
[i
][BCOMP
] - (GLint
) arg1
[i
][BCOMP
]) << RGBshift
;
447 rgba
[i
][RCOMP
] = (GLchan
) CLAMP(r
, 0, CHAN_MAX
);
448 rgba
[i
][GCOMP
] = (GLchan
) CLAMP(g
, 0, CHAN_MAX
);
449 rgba
[i
][BCOMP
] = (GLchan
) CLAMP(b
, 0, CHAN_MAX
);
454 case GL_DOT3_RGB_EXT
:
455 case GL_DOT3_RGBA_EXT
:
457 /* Do not scale the result by 1 2 or 4 */
458 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
459 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
460 for (i
= 0; i
< n
; i
++) {
461 #if CHAN_TYPE == GL_FLOAT
462 GLchan dot
= ((arg0
[i
][RCOMP
]-0.5F
) * (arg1
[i
][RCOMP
]-0.5F
) +
463 (arg0
[i
][GCOMP
]-0.5F
) * (arg1
[i
][GCOMP
]-0.5F
) +
464 (arg0
[i
][BCOMP
]-0.5F
) * (arg1
[i
][BCOMP
]-0.5F
))
466 dot
= CLAMP(dot
, 0.0F
, CHAN_MAXF
);
468 GLint dot
= (S_PROD((GLint
)arg0
[i
][RCOMP
] - half
,
469 (GLint
)arg1
[i
][RCOMP
] - half
) +
470 S_PROD((GLint
)arg0
[i
][GCOMP
] - half
,
471 (GLint
)arg1
[i
][GCOMP
] - half
) +
472 S_PROD((GLint
)arg0
[i
][BCOMP
] - half
,
473 (GLint
)arg1
[i
][BCOMP
] - half
)) >> 6;
474 dot
= CLAMP(dot
, 0, CHAN_MAX
);
476 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = (GLchan
) dot
;
483 /* DO scale the result by 1 2 or 4 */
484 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
485 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
486 for (i
= 0; i
< n
; i
++) {
487 #if CHAN_TYPE == GL_FLOAT
488 GLchan dot
= ((arg0
[i
][RCOMP
]-0.5F
) * (arg1
[i
][RCOMP
]-0.5F
) +
489 (arg0
[i
][GCOMP
]-0.5F
) * (arg1
[i
][GCOMP
]-0.5F
) +
490 (arg0
[i
][BCOMP
]-0.5F
) * (arg1
[i
][BCOMP
]-0.5F
))
492 dot
= CLAMP(dot
, 0.0, CHAN_MAXF
);
494 GLint dot
= (S_PROD((GLint
)arg0
[i
][RCOMP
] - half
,
495 (GLint
)arg1
[i
][RCOMP
] - half
) +
496 S_PROD((GLint
)arg0
[i
][GCOMP
] - half
,
497 (GLint
)arg1
[i
][GCOMP
] - half
) +
498 S_PROD((GLint
)arg0
[i
][BCOMP
] - half
,
499 (GLint
)arg1
[i
][BCOMP
] - half
)) >> 6;
501 dot
= CLAMP(dot
, 0, CHAN_MAX
);
503 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = (GLchan
) dot
;
507 case GL_MODULATE_ADD_ATI
:
509 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
510 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
511 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
512 #if CHAN_TYPE != GL_FLOAT
513 const GLint shift
= CHAN_BITS
- RGBshift
;
515 for (i
= 0; i
< n
; i
++) {
516 #if CHAN_TYPE == GL_FLOAT
517 rgba
[i
][RCOMP
] = ((arg0
[i
][RCOMP
] * arg2
[i
][RCOMP
]) + arg1
[i
][RCOMP
]) * RGBmult
;
518 rgba
[i
][GCOMP
] = ((arg0
[i
][GCOMP
] * arg2
[i
][GCOMP
]) + arg1
[i
][GCOMP
]) * RGBmult
;
519 rgba
[i
][BCOMP
] = ((arg0
[i
][BCOMP
] * arg2
[i
][BCOMP
]) + arg1
[i
][BCOMP
]) * RGBmult
;
521 GLuint r
= (PROD(arg0
[i
][RCOMP
], arg2
[i
][RCOMP
])
522 + ((GLuint
) arg1
[i
][RCOMP
] << CHAN_BITS
)) >> shift
;
523 GLuint g
= (PROD(arg0
[i
][GCOMP
], arg2
[i
][GCOMP
])
524 + ((GLuint
) arg1
[i
][GCOMP
] << CHAN_BITS
)) >> shift
;
525 GLuint b
= (PROD(arg0
[i
][BCOMP
], arg2
[i
][BCOMP
])
526 + ((GLuint
) arg1
[i
][BCOMP
] << CHAN_BITS
)) >> shift
;
527 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
528 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
529 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
534 case GL_MODULATE_SIGNED_ADD_ATI
:
536 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
537 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
538 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
539 #if CHAN_TYPE != GL_FLOAT
540 const GLint shift
= CHAN_BITS
- RGBshift
;
542 for (i
= 0; i
< n
; i
++) {
543 #if CHAN_TYPE == GL_FLOAT
544 rgba
[i
][RCOMP
] = ((arg0
[i
][RCOMP
] * arg2
[i
][RCOMP
]) + arg1
[i
][RCOMP
] - 0.5) * RGBmult
;
545 rgba
[i
][GCOMP
] = ((arg0
[i
][GCOMP
] * arg2
[i
][GCOMP
]) + arg1
[i
][GCOMP
] - 0.5) * RGBmult
;
546 rgba
[i
][BCOMP
] = ((arg0
[i
][BCOMP
] * arg2
[i
][BCOMP
]) + arg1
[i
][BCOMP
] - 0.5) * RGBmult
;
548 GLint r
= (S_PROD(arg0
[i
][RCOMP
], arg2
[i
][RCOMP
])
549 + (((GLint
) arg1
[i
][RCOMP
] - half
) << CHAN_BITS
))
551 GLint g
= (S_PROD(arg0
[i
][GCOMP
], arg2
[i
][GCOMP
])
552 + (((GLint
) arg1
[i
][GCOMP
] - half
) << CHAN_BITS
))
554 GLint b
= (S_PROD(arg0
[i
][BCOMP
], arg2
[i
][BCOMP
])
555 + (((GLint
) arg1
[i
][BCOMP
] - half
) << CHAN_BITS
))
557 rgba
[i
][RCOMP
] = (GLchan
) CLAMP(r
, 0, CHAN_MAX
);
558 rgba
[i
][GCOMP
] = (GLchan
) CLAMP(g
, 0, CHAN_MAX
);
559 rgba
[i
][BCOMP
] = (GLchan
) CLAMP(b
, 0, CHAN_MAX
);
564 case GL_MODULATE_SUBTRACT_ATI
:
566 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
567 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
568 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
569 #if CHAN_TYPE != GL_FLOAT
570 const GLint shift
= CHAN_BITS
- RGBshift
;
572 for (i
= 0; i
< n
; i
++) {
573 #if CHAN_TYPE == GL_FLOAT
574 rgba
[i
][RCOMP
] = ((arg0
[i
][RCOMP
] * arg2
[i
][RCOMP
]) - arg1
[i
][RCOMP
]) * RGBmult
;
575 rgba
[i
][GCOMP
] = ((arg0
[i
][GCOMP
] * arg2
[i
][GCOMP
]) - arg1
[i
][GCOMP
]) * RGBmult
;
576 rgba
[i
][BCOMP
] = ((arg0
[i
][BCOMP
] * arg2
[i
][BCOMP
]) - arg1
[i
][BCOMP
]) * RGBmult
;
578 GLint r
= (S_PROD(arg0
[i
][RCOMP
], arg2
[i
][RCOMP
])
579 - ((GLint
) arg1
[i
][RCOMP
] << CHAN_BITS
))
581 GLint g
= (S_PROD(arg0
[i
][GCOMP
], arg2
[i
][GCOMP
])
582 - ((GLint
) arg1
[i
][GCOMP
] << CHAN_BITS
))
584 GLint b
= (S_PROD(arg0
[i
][BCOMP
], arg2
[i
][BCOMP
])
585 - ((GLint
) arg1
[i
][BCOMP
] << CHAN_BITS
))
587 rgba
[i
][RCOMP
] = (GLchan
) CLAMP(r
, 0, CHAN_MAX
);
588 rgba
[i
][GCOMP
] = (GLchan
) CLAMP(g
, 0, CHAN_MAX
);
589 rgba
[i
][BCOMP
] = (GLchan
) CLAMP(b
, 0, CHAN_MAX
);
595 _mesa_problem(ctx
, "invalid combine mode");
598 switch (textureUnit
->_CurrentCombine
->ModeA
) {
601 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
603 for (i
= 0; i
< n
; i
++) {
604 #if CHAN_TYPE == GL_FLOAT
605 GLchan a
= arg0
[i
][ACOMP
] * Amult
;
607 GLuint a
= (GLuint
) arg0
[i
][ACOMP
] << Ashift
;
609 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
613 for (i
= 0; i
< n
; i
++) {
614 rgba
[i
][ACOMP
] = arg0
[i
][ACOMP
];
621 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
622 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
623 #if CHAN_TYPE != GL_FLOAT
624 const GLint shift
= CHAN_BITS
- Ashift
;
626 for (i
= 0; i
< n
; i
++) {
627 #if CHAN_TYPE == GL_FLOAT
628 rgba
[i
][ACOMP
] = arg0
[i
][ACOMP
] * arg1
[i
][ACOMP
] * Amult
;
630 GLuint a
= (PROD(arg0
[i
][ACOMP
], arg1
[i
][ACOMP
]) >> shift
);
631 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
637 if (textureUnit
->EnvMode
== GL_COMBINE4_NV
) {
638 /* (a * b) + (c * d) */
639 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
640 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
641 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
642 const GLchan (*arg3
)[4] = (const GLchan (*)[4]) argA
[3];
643 for (i
= 0; i
< n
; i
++) {
644 #if CHAN_TYPE == GL_FLOAT
645 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] * arg1
[i
][ACOMP
] +
646 arg2
[i
][ACOMP
] * arg3
[i
][ACOMP
]) * Amult
;
648 const GLint shift
= CHAN_BITS
- Ashift
;
649 GLint a
= (PROD(arg0
[i
][ACOMP
], arg1
[i
][ACOMP
]) >> shift
) +
650 (PROD(arg2
[i
][ACOMP
], arg3
[i
][ACOMP
]) >> shift
);
651 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
657 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
658 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
659 for (i
= 0; i
< n
; i
++) {
660 #if CHAN_TYPE == GL_FLOAT
661 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] + arg1
[i
][ACOMP
]) * Amult
;
663 GLint a
= ((GLint
) arg0
[i
][ACOMP
] + arg1
[i
][ACOMP
]) << Ashift
;
664 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
670 if (textureUnit
->EnvMode
== GL_COMBINE4_NV
) {
671 /* (a * b) + (c * d) - 0.5 */
672 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
673 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
674 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
675 const GLchan (*arg3
)[4] = (const GLchan (*)[4]) argA
[3];
676 for (i
= 0; i
< n
; i
++) {
677 #if CHAN_TYPE == GL_FLOAT
678 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] * arg1
[i
][ACOMP
] +
679 arg2
[i
][ACOMP
] * arg3
[i
][ACOMP
] -
682 GLint a
= (((PROD(arg0
[i
][ACOMP
], arg1
[i
][ACOMP
]) +
683 PROD(arg2
[i
][ACOMP
], arg3
[i
][ACOMP
])) >> CHAN_BITS
) - half
)
685 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
691 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
692 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
693 for (i
= 0; i
< n
; i
++) {
694 #if CHAN_TYPE == GL_FLOAT
695 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] + arg1
[i
][ACOMP
] - 0.5F
) * Amult
;
697 GLint a
= (GLint
) arg0
[i
][ACOMP
] + (GLint
) arg1
[i
][ACOMP
] -half
;
698 a
= (a
< 0) ? 0 : a
<< Ashift
;
699 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
706 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
707 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
708 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
709 #if CHAN_TYPE != GL_FLOAT
710 const GLint shift
= CHAN_BITS
- Ashift
;
712 for (i
=0; i
<n
; i
++) {
713 #if CHAN_TYPE == GL_FLOAT
714 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] * arg2
[i
][ACOMP
] +
715 arg1
[i
][ACOMP
] * (CHAN_MAXF
- arg2
[i
][ACOMP
]))
718 GLuint a
= (PROD(arg0
[i
][ACOMP
], arg2
[i
][ACOMP
])
719 + PROD(arg1
[i
][ACOMP
], CHAN_MAX
- arg2
[i
][ACOMP
]))
721 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
728 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
729 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
730 for (i
= 0; i
< n
; i
++) {
731 #if CHAN_TYPE == GL_FLOAT
732 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] - arg1
[i
][ACOMP
]) * Amult
;
734 GLint a
= ((GLint
) arg0
[i
][ACOMP
] - (GLint
) arg1
[i
][ACOMP
]) << Ashift
;
735 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
740 case GL_MODULATE_ADD_ATI
:
742 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
743 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
744 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
745 #if CHAN_TYPE != GL_FLOAT
746 const GLint shift
= CHAN_BITS
- Ashift
;
748 for (i
= 0; i
< n
; i
++) {
749 #if CHAN_TYPE == GL_FLOAT
750 rgba
[i
][ACOMP
] = ((arg0
[i
][ACOMP
] * arg2
[i
][ACOMP
]) + arg1
[i
][ACOMP
]) * Amult
;
752 GLint a
= (PROD(arg0
[i
][ACOMP
], arg2
[i
][ACOMP
])
753 + ((GLuint
) arg1
[i
][ACOMP
] << CHAN_BITS
))
755 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
760 case GL_MODULATE_SIGNED_ADD_ATI
:
762 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
763 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
764 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
765 #if CHAN_TYPE != GL_FLOAT
766 const GLint shift
= CHAN_BITS
- Ashift
;
768 for (i
= 0; i
< n
; i
++) {
769 #if CHAN_TYPE == GL_FLOAT
770 rgba
[i
][ACOMP
] = ((arg0
[i
][ACOMP
] * arg2
[i
][ACOMP
]) + arg1
[i
][ACOMP
] - 0.5F
) * Amult
;
772 GLint a
= (S_PROD(arg0
[i
][ACOMP
], arg2
[i
][ACOMP
])
773 + (((GLint
) arg1
[i
][ACOMP
] - half
) << CHAN_BITS
))
775 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
780 case GL_MODULATE_SUBTRACT_ATI
:
782 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
783 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
784 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
785 #if CHAN_TYPE != GL_FLOAT
786 const GLint shift
= CHAN_BITS
- Ashift
;
788 for (i
= 0; i
< n
; i
++) {
789 #if CHAN_TYPE == GL_FLOAT
790 rgba
[i
][ACOMP
] = ((arg0
[i
][ACOMP
] * arg2
[i
][ACOMP
]) - arg1
[i
][ACOMP
]) * Amult
;
792 GLint a
= (S_PROD(arg0
[i
][ACOMP
], arg2
[i
][ACOMP
])
793 - ((GLint
) arg1
[i
][ACOMP
] << CHAN_BITS
))
795 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
801 _mesa_problem(ctx
, "invalid combine mode");
804 /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining.
805 * This is kind of a kludge. It would have been better if the spec
806 * were written such that the GL_COMBINE_ALPHA value could be set to
809 if (textureUnit
->_CurrentCombine
->ModeRGB
== GL_DOT3_RGBA_EXT
||
810 textureUnit
->_CurrentCombine
->ModeRGB
== GL_DOT3_RGBA
) {
811 for (i
= 0; i
< n
; i
++) {
812 rgba
[i
][ACOMP
] = rgba
[i
][RCOMP
];
820 * Apply X/Y/Z/W/0/1 swizzle to an array of colors/texels.
821 * See GL_EXT_texture_swizzle.
824 swizzle_texels(GLuint swizzle
, GLuint count
, GLchan (*texels
)[4])
826 const GLuint swzR
= GET_SWZ(swizzle
, 0);
827 const GLuint swzG
= GET_SWZ(swizzle
, 1);
828 const GLuint swzB
= GET_SWZ(swizzle
, 2);
829 const GLuint swzA
= GET_SWZ(swizzle
, 3);
833 vector
[SWIZZLE_ZERO
] = 0;
834 vector
[SWIZZLE_ONE
] = CHAN_MAX
;
836 for (i
= 0; i
< count
; i
++) {
837 vector
[SWIZZLE_X
] = texels
[i
][0];
838 vector
[SWIZZLE_Y
] = texels
[i
][1];
839 vector
[SWIZZLE_Z
] = texels
[i
][2];
840 vector
[SWIZZLE_W
] = texels
[i
][3];
841 texels
[i
][RCOMP
] = vector
[swzR
];
842 texels
[i
][GCOMP
] = vector
[swzG
];
843 texels
[i
][BCOMP
] = vector
[swzB
];
844 texels
[i
][ACOMP
] = vector
[swzA
];
850 * Apply a conventional OpenGL texture env mode (REPLACE, ADD, BLEND,
851 * MODULATE, or DECAL) to an array of fragments.
852 * Input: textureUnit - pointer to texture unit to apply
853 * format - base internal texture format
854 * n - number of fragments
855 * primary_rgba - primary colors (may alias rgba for single texture)
856 * texels - array of texel colors
857 * InOut: rgba - incoming fragment colors modified by texel colors
858 * according to the texture environment mode.
861 texture_apply( const GLcontext
*ctx
,
862 const struct gl_texture_unit
*texUnit
,
864 CONST GLchan primary_rgba
[][4], CONST GLchan texel
[][4],
869 GLchan Rc
, Gc
, Bc
, Ac
;
874 ASSERT(texUnit
->_Current
);
876 baseLevel
= texUnit
->_Current
->BaseLevel
;
877 ASSERT(texUnit
->_Current
->Image
[0][baseLevel
]);
879 format
= texUnit
->_Current
->Image
[0][baseLevel
]->_BaseFormat
;
881 if (format
== GL_COLOR_INDEX
|| format
== GL_YCBCR_MESA
) {
882 format
= GL_RGBA
; /* a bit of a hack */
884 else if (format
== GL_DEPTH_COMPONENT
|| format
== GL_DEPTH_STENCIL_EXT
) {
885 format
= texUnit
->_Current
->DepthMode
;
888 switch (texUnit
->EnvMode
) {
895 rgba
[i
][ACOMP
] = texel
[i
][ACOMP
];
901 GLchan Lt
= texel
[i
][RCOMP
];
902 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = Lt
;
906 case GL_LUMINANCE_ALPHA
:
908 GLchan Lt
= texel
[i
][RCOMP
];
910 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = Lt
;
912 rgba
[i
][ACOMP
] = texel
[i
][ACOMP
];
918 GLchan It
= texel
[i
][RCOMP
];
919 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = It
;
927 rgba
[i
][RCOMP
] = texel
[i
][RCOMP
];
928 rgba
[i
][GCOMP
] = texel
[i
][GCOMP
];
929 rgba
[i
][BCOMP
] = texel
[i
][BCOMP
];
936 rgba
[i
][RCOMP
] = texel
[i
][RCOMP
];
937 rgba
[i
][GCOMP
] = texel
[i
][GCOMP
];
938 rgba
[i
][BCOMP
] = texel
[i
][BCOMP
];
940 rgba
[i
][ACOMP
] = texel
[i
][ACOMP
];
944 _mesa_problem(ctx
, "Bad format (GL_REPLACE) in texture_apply");
955 rgba
[i
][ACOMP
] = CHAN_PRODUCT( rgba
[i
][ACOMP
], texel
[i
][ACOMP
] );
961 GLchan Lt
= texel
[i
][RCOMP
];
962 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], Lt
);
963 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], Lt
);
964 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], Lt
);
968 case GL_LUMINANCE_ALPHA
:
971 GLchan Lt
= texel
[i
][RCOMP
];
972 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], Lt
);
973 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], Lt
);
974 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], Lt
);
976 rgba
[i
][ACOMP
] = CHAN_PRODUCT( rgba
[i
][ACOMP
], texel
[i
][ACOMP
] );
982 GLchan It
= texel
[i
][RCOMP
];
983 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], It
);
984 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], It
);
985 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], It
);
987 rgba
[i
][ACOMP
] = CHAN_PRODUCT( rgba
[i
][ACOMP
], It
);
993 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], texel
[i
][RCOMP
] );
994 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], texel
[i
][GCOMP
] );
995 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], texel
[i
][BCOMP
] );
1002 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], texel
[i
][RCOMP
] );
1003 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], texel
[i
][GCOMP
] );
1004 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], texel
[i
][BCOMP
] );
1006 rgba
[i
][ACOMP
] = CHAN_PRODUCT( rgba
[i
][ACOMP
], texel
[i
][ACOMP
] );
1010 _mesa_problem(ctx
, "Bad format (GL_MODULATE) in texture_apply");
1019 case GL_LUMINANCE_ALPHA
:
1026 rgba
[i
][RCOMP
] = texel
[i
][RCOMP
];
1027 rgba
[i
][GCOMP
] = texel
[i
][GCOMP
];
1028 rgba
[i
][BCOMP
] = texel
[i
][BCOMP
];
1034 /* Cv = Cf(1-At) + CtAt */
1035 GLchan t
= texel
[i
][ACOMP
], s
= CHAN_MAX
- t
;
1036 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], s
) + CHAN_PRODUCT(texel
[i
][RCOMP
],t
);
1037 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], s
) + CHAN_PRODUCT(texel
[i
][GCOMP
],t
);
1038 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], s
) + CHAN_PRODUCT(texel
[i
][BCOMP
],t
);
1043 _mesa_problem(ctx
, "Bad format (GL_DECAL) in texture_apply");
1049 UNCLAMPED_FLOAT_TO_CHAN(Rc
, texUnit
->EnvColor
[0]);
1050 UNCLAMPED_FLOAT_TO_CHAN(Gc
, texUnit
->EnvColor
[1]);
1051 UNCLAMPED_FLOAT_TO_CHAN(Bc
, texUnit
->EnvColor
[2]);
1052 UNCLAMPED_FLOAT_TO_CHAN(Ac
, texUnit
->EnvColor
[3]);
1058 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], texel
[i
][ACOMP
]);
1063 /* Cv = Cf(1-Lt) + CcLt */
1064 GLchan Lt
= texel
[i
][RCOMP
], s
= CHAN_MAX
- Lt
;
1065 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], s
) + CHAN_PRODUCT(Rc
, Lt
);
1066 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], s
) + CHAN_PRODUCT(Gc
, Lt
);
1067 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], s
) + CHAN_PRODUCT(Bc
, Lt
);
1071 case GL_LUMINANCE_ALPHA
:
1073 /* Cv = Cf(1-Lt) + CcLt */
1074 GLchan Lt
= texel
[i
][RCOMP
], s
= CHAN_MAX
- Lt
;
1075 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], s
) + CHAN_PRODUCT(Rc
, Lt
);
1076 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], s
) + CHAN_PRODUCT(Gc
, Lt
);
1077 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], s
) + CHAN_PRODUCT(Bc
, Lt
);
1079 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
],texel
[i
][ACOMP
]);
1084 /* Cv = Cf(1-It) + CcIt */
1085 GLchan It
= texel
[i
][RCOMP
], s
= CHAN_MAX
- It
;
1086 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], s
) + CHAN_PRODUCT(Rc
, It
);
1087 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], s
) + CHAN_PRODUCT(Gc
, It
);
1088 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], s
) + CHAN_PRODUCT(Bc
, It
);
1089 /* Av = Af(1-It) + Ac*It */
1090 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], s
) + CHAN_PRODUCT(Ac
, It
);
1095 /* Cv = Cf(1-Ct) + CcCt */
1096 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], (CHAN_MAX
-texel
[i
][RCOMP
])) + CHAN_PRODUCT(Rc
,texel
[i
][RCOMP
]);
1097 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], (CHAN_MAX
-texel
[i
][GCOMP
])) + CHAN_PRODUCT(Gc
,texel
[i
][GCOMP
]);
1098 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], (CHAN_MAX
-texel
[i
][BCOMP
])) + CHAN_PRODUCT(Bc
,texel
[i
][BCOMP
]);
1104 /* Cv = Cf(1-Ct) + CcCt */
1105 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], (CHAN_MAX
-texel
[i
][RCOMP
])) + CHAN_PRODUCT(Rc
,texel
[i
][RCOMP
]);
1106 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], (CHAN_MAX
-texel
[i
][GCOMP
])) + CHAN_PRODUCT(Gc
,texel
[i
][GCOMP
]);
1107 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], (CHAN_MAX
-texel
[i
][BCOMP
])) + CHAN_PRODUCT(Bc
,texel
[i
][BCOMP
]);
1109 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
],texel
[i
][ACOMP
]);
1113 _mesa_problem(ctx
, "Bad format (GL_BLEND) in texture_apply");
1118 /* XXX don't clamp results if GLchan is float??? */
1120 case GL_ADD
: /* GL_EXT_texture_add_env */
1127 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], texel
[i
][ACOMP
]);
1132 ChanTemp Lt
= texel
[i
][RCOMP
];
1133 ChanTemp r
= rgba
[i
][RCOMP
] + Lt
;
1134 ChanTemp g
= rgba
[i
][GCOMP
] + Lt
;
1135 ChanTemp b
= rgba
[i
][BCOMP
] + Lt
;
1136 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1137 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1138 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1142 case GL_LUMINANCE_ALPHA
:
1144 ChanTemp Lt
= texel
[i
][RCOMP
];
1145 ChanTemp r
= rgba
[i
][RCOMP
] + Lt
;
1146 ChanTemp g
= rgba
[i
][GCOMP
] + Lt
;
1147 ChanTemp b
= rgba
[i
][BCOMP
] + Lt
;
1148 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1149 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1150 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1151 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], texel
[i
][ACOMP
]);
1156 GLchan It
= texel
[i
][RCOMP
];
1157 ChanTemp r
= rgba
[i
][RCOMP
] + It
;
1158 ChanTemp g
= rgba
[i
][GCOMP
] + It
;
1159 ChanTemp b
= rgba
[i
][BCOMP
] + It
;
1160 ChanTemp a
= rgba
[i
][ACOMP
] + It
;
1161 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1162 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1163 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1164 rgba
[i
][ACOMP
] = MIN2(a
, CHAN_MAX
);
1169 ChanTemp r
= rgba
[i
][RCOMP
] + texel
[i
][RCOMP
];
1170 ChanTemp g
= rgba
[i
][GCOMP
] + texel
[i
][GCOMP
];
1171 ChanTemp b
= rgba
[i
][BCOMP
] + texel
[i
][BCOMP
];
1172 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1173 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1174 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1180 ChanTemp r
= rgba
[i
][RCOMP
] + texel
[i
][RCOMP
];
1181 ChanTemp g
= rgba
[i
][GCOMP
] + texel
[i
][GCOMP
];
1182 ChanTemp b
= rgba
[i
][BCOMP
] + texel
[i
][BCOMP
];
1183 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1184 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1185 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1186 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], texel
[i
][ACOMP
]);
1190 _mesa_problem(ctx
, "Bad format (GL_ADD) in texture_apply");
1196 _mesa_problem(ctx
, "Bad env mode in texture_apply");
1204 * Apply texture mapping to a span of fragments.
1207 _swrast_texture_span( GLcontext
*ctx
, SWspan
*span
)
1209 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
1210 GLchan primary_rgba
[MAX_WIDTH
][4];
1213 ASSERT(span
->end
< MAX_WIDTH
);
1216 * Save copy of the incoming fragment colors (the GL_PRIMARY_COLOR)
1218 if (swrast
->_AnyTextureCombine
)
1219 MEMCPY(primary_rgba
, span
->array
->rgba
, 4 * span
->end
* sizeof(GLchan
));
1222 * Must do all texture sampling before combining in order to
1223 * accomodate GL_ARB_texture_env_crossbar.
1225 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++) {
1226 if (ctx
->Texture
.Unit
[unit
]._ReallyEnabled
) {
1227 const GLfloat (*texcoords
)[4]
1228 = (const GLfloat (*)[4])
1229 span
->array
->attribs
[FRAG_ATTRIB_TEX0
+ unit
];
1230 const struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
1231 const struct gl_texture_object
*curObj
= texUnit
->_Current
;
1232 GLfloat
*lambda
= span
->array
->lambda
[unit
];
1233 GLchan (*texels
)[4] = (GLchan (*)[4])
1234 (swrast
->TexelBuffer
+ unit
* (span
->end
* 4 * sizeof(GLchan
)));
1236 /* adjust texture lod (lambda) */
1237 if (span
->arrayMask
& SPAN_LAMBDA
) {
1238 if (texUnit
->LodBias
+ curObj
->LodBias
!= 0.0F
) {
1239 /* apply LOD bias, but don't clamp yet */
1240 const GLfloat bias
= CLAMP(texUnit
->LodBias
+ curObj
->LodBias
,
1241 -ctx
->Const
.MaxTextureLodBias
,
1242 ctx
->Const
.MaxTextureLodBias
);
1244 for (i
= 0; i
< span
->end
; i
++) {
1249 if (curObj
->MinLod
!= -1000.0 || curObj
->MaxLod
!= 1000.0) {
1250 /* apply LOD clamping to lambda */
1251 const GLfloat min
= curObj
->MinLod
;
1252 const GLfloat max
= curObj
->MaxLod
;
1254 for (i
= 0; i
< span
->end
; i
++) {
1255 GLfloat l
= lambda
[i
];
1256 lambda
[i
] = CLAMP(l
, min
, max
);
1261 /* Sample the texture (span->end = number of fragments) */
1262 swrast
->TextureSample
[unit
]( ctx
, texUnit
->_Current
, span
->end
,
1263 texcoords
, lambda
, texels
);
1265 /* GL_SGI_texture_color_table */
1266 if (texUnit
->ColorTableEnabled
) {
1267 #if CHAN_TYPE == GL_UNSIGNED_BYTE
1268 _mesa_lookup_rgba_ubyte(&texUnit
->ColorTable
, span
->end
, texels
);
1269 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
1270 _mesa_lookup_rgba_ubyte(&texUnit
->ColorTable
, span
->end
, texels
);
1272 _mesa_lookup_rgba_float(&texUnit
->ColorTable
, span
->end
, texels
);
1276 /* GL_EXT_texture_swizzle */
1277 if (curObj
->_Swizzle
!= SWIZZLE_NOOP
) {
1278 swizzle_texels(curObj
->_Swizzle
, span
->end
, texels
);
1285 * OK, now apply the texture (aka texture combine/blend).
1286 * We modify the span->color.rgba values.
1288 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++) {
1289 if (ctx
->Texture
.Unit
[unit
]._ReallyEnabled
) {
1290 const struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
1291 if (texUnit
->_CurrentCombine
!= &texUnit
->_EnvMode
) {
1292 texture_combine( ctx
, unit
, span
->end
,
1293 (CONST
GLchan (*)[4]) primary_rgba
,
1294 swrast
->TexelBuffer
,
1295 span
->array
->rgba
);
1298 /* conventional texture blend */
1299 const GLchan (*texels
)[4] = (const GLchan (*)[4])
1300 (swrast
->TexelBuffer
+ unit
*
1301 (span
->end
* 4 * sizeof(GLchan
)));
1304 texture_apply( ctx
, texUnit
, span
->end
,
1305 (CONST
GLchan (*)[4]) primary_rgba
, texels
,
1306 span
->array
->rgba
);