2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
33 #include "s_context.h"
34 #include "s_texcombine.h"
37 #define PROD(A,B) ( (GLuint)(A) * ((GLuint)(B)+1) )
38 #define S_PROD(A,B) ( (GLint)(A) * ((GLint)(B)+1) )
40 typedef GLfloat ChanTemp
;
42 typedef GLuint ChanTemp
;
47 * Do texture application for GL_ARB/EXT_texture_env_combine.
48 * This function also supports GL_{EXT,ARB}_texture_env_dot3 and
49 * GL_ATI_texture_env_combine3. Since "classic" texture environments are
50 * implemented using GL_ARB_texture_env_combine-like state, this same function
51 * is used for classic texture environment application as well.
53 * \param ctx rendering context
54 * \param textureUnit the texture unit to apply
55 * \param n number of fragments to process (span width)
56 * \param primary_rgba incoming fragment color array
57 * \param texelBuffer pointer to texel colors for all texture units
59 * \param rgba incoming colors, which get modified here
62 texture_combine( const GLcontext
*ctx
, GLuint unit
, GLuint n
,
63 CONST
GLchan (*primary_rgba
)[4],
64 CONST GLchan
*texelBuffer
,
67 const struct gl_texture_unit
*textureUnit
= &(ctx
->Texture
.Unit
[unit
]);
68 const GLchan (*argRGB
[3])[4];
69 const GLchan (*argA
[3])[4];
70 const GLuint RGBshift
= textureUnit
->_CurrentCombine
->ScaleShiftRGB
;
71 const GLuint Ashift
= textureUnit
->_CurrentCombine
->ScaleShiftA
;
72 #if CHAN_TYPE == GL_FLOAT
73 const GLchan RGBmult
= (GLfloat
) (1 << RGBshift
);
74 const GLchan Amult
= (GLfloat
) (1 << Ashift
);
76 const GLint half
= (CHAN_MAX
+ 1) / 2;
78 static const GLchan one
[4] = { CHAN_MAX
, CHAN_MAX
, CHAN_MAX
, CHAN_MAX
};
79 static const GLchan zero
[4] = { 0, 0, 0, 0 };
80 const GLuint numColorArgs
= textureUnit
->_CurrentCombine
->_NumArgsRGB
;
81 const GLuint numAlphaArgs
= textureUnit
->_CurrentCombine
->_NumArgsA
;
82 GLchan ccolor
[3][MAX_WIDTH
][4];
85 ASSERT(ctx
->Extensions
.EXT_texture_env_combine
||
86 ctx
->Extensions
.ARB_texture_env_combine
);
87 ASSERT(SWRAST_CONTEXT(ctx
)->_AnyTextureCombine
);
90 printf("modeRGB 0x%x modeA 0x%x srcRGB1 0x%x srcA1 0x%x srcRGB2 0x%x srcA2 0x%x\n",
91 textureUnit->_CurrentCombine->ModeRGB,
92 textureUnit->_CurrentCombine->ModeA,
93 textureUnit->_CurrentCombine->SourceRGB[0],
94 textureUnit->_CurrentCombine->SourceA[0],
95 textureUnit->_CurrentCombine->SourceRGB[1],
96 textureUnit->_CurrentCombine->SourceA[1]);
100 * Do operand setup for up to 3 operands. Loop over the terms.
102 for (j
= 0; j
< numColorArgs
; j
++) {
103 const GLenum srcRGB
= textureUnit
->_CurrentCombine
->SourceRGB
[j
];
107 argRGB
[j
] = (const GLchan (*)[4])
108 (texelBuffer
+ unit
* (n
* 4 * sizeof(GLchan
)));
110 case GL_PRIMARY_COLOR
:
111 argRGB
[j
] = primary_rgba
;
114 argRGB
[j
] = (const GLchan (*)[4]) rgba
;
118 GLchan (*c
)[4] = ccolor
[j
];
119 GLchan red
, green
, blue
, alpha
;
120 UNCLAMPED_FLOAT_TO_CHAN(red
, textureUnit
->EnvColor
[0]);
121 UNCLAMPED_FLOAT_TO_CHAN(green
, textureUnit
->EnvColor
[1]);
122 UNCLAMPED_FLOAT_TO_CHAN(blue
, textureUnit
->EnvColor
[2]);
123 UNCLAMPED_FLOAT_TO_CHAN(alpha
, textureUnit
->EnvColor
[3]);
124 for (i
= 0; i
< n
; i
++) {
130 argRGB
[j
] = (const GLchan (*)[4]) ccolor
[j
];
133 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
142 /* ARB_texture_env_crossbar source */
144 const GLuint srcUnit
= srcRGB
- GL_TEXTURE0
;
145 ASSERT(srcUnit
< ctx
->Const
.MaxTextureUnits
);
146 if (!ctx
->Texture
.Unit
[srcUnit
]._ReallyEnabled
)
148 argRGB
[j
] = (const GLchan (*)[4])
149 (texelBuffer
+ srcUnit
* (n
* 4 * sizeof(GLchan
)));
153 if (textureUnit
->_CurrentCombine
->OperandRGB
[j
] != GL_SRC_COLOR
) {
154 const GLchan (*src
)[4] = argRGB
[j
];
155 GLchan (*dst
)[4] = ccolor
[j
];
157 /* point to new arg[j] storage */
158 argRGB
[j
] = (const GLchan (*)[4]) ccolor
[j
];
160 if (textureUnit
->_CurrentCombine
->OperandRGB
[j
] == GL_ONE_MINUS_SRC_COLOR
) {
161 for (i
= 0; i
< n
; i
++) {
162 dst
[i
][RCOMP
] = CHAN_MAX
- src
[i
][RCOMP
];
163 dst
[i
][GCOMP
] = CHAN_MAX
- src
[i
][GCOMP
];
164 dst
[i
][BCOMP
] = CHAN_MAX
- src
[i
][BCOMP
];
167 else if (textureUnit
->_CurrentCombine
->OperandRGB
[j
] == GL_SRC_ALPHA
) {
168 for (i
= 0; i
< n
; i
++) {
169 dst
[i
][RCOMP
] = src
[i
][ACOMP
];
170 dst
[i
][GCOMP
] = src
[i
][ACOMP
];
171 dst
[i
][BCOMP
] = src
[i
][ACOMP
];
175 ASSERT(textureUnit
->_CurrentCombine
->OperandRGB
[j
] ==GL_ONE_MINUS_SRC_ALPHA
);
176 for (i
= 0; i
< n
; i
++) {
177 dst
[i
][RCOMP
] = CHAN_MAX
- src
[i
][ACOMP
];
178 dst
[i
][GCOMP
] = CHAN_MAX
- src
[i
][ACOMP
];
179 dst
[i
][BCOMP
] = CHAN_MAX
- src
[i
][ACOMP
];
186 * Set up the argA[i] pointers
188 for (j
= 0; j
< numAlphaArgs
; j
++) {
189 const GLenum srcA
= textureUnit
->_CurrentCombine
->SourceA
[j
];
193 argA
[j
] = (const GLchan (*)[4])
194 (texelBuffer
+ unit
* (n
* 4 * sizeof(GLchan
)));
196 case GL_PRIMARY_COLOR
:
197 argA
[j
] = primary_rgba
;
200 argA
[j
] = (const GLchan (*)[4]) rgba
;
204 GLchan alpha
, (*c
)[4] = ccolor
[j
];
205 UNCLAMPED_FLOAT_TO_CHAN(alpha
, textureUnit
->EnvColor
[3]);
206 for (i
= 0; i
< n
; i
++)
208 argA
[j
] = (const GLchan (*)[4]) ccolor
[j
];
211 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
220 /* ARB_texture_env_crossbar source */
222 const GLuint srcUnit
= srcA
- GL_TEXTURE0
;
223 ASSERT(srcUnit
< ctx
->Const
.MaxTextureUnits
);
224 if (!ctx
->Texture
.Unit
[srcUnit
]._ReallyEnabled
)
226 argA
[j
] = (const GLchan (*)[4])
227 (texelBuffer
+ srcUnit
* (n
* 4 * sizeof(GLchan
)));
231 if (textureUnit
->_CurrentCombine
->OperandA
[j
] == GL_ONE_MINUS_SRC_ALPHA
) {
232 const GLchan (*src
)[4] = argA
[j
];
233 GLchan (*dst
)[4] = ccolor
[j
];
234 argA
[j
] = (const GLchan (*)[4]) ccolor
[j
];
235 for (i
= 0; i
< n
; i
++) {
236 dst
[i
][ACOMP
] = CHAN_MAX
- src
[i
][ACOMP
];
242 * Do the texture combine.
244 switch (textureUnit
->_CurrentCombine
->ModeRGB
) {
247 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
249 for (i
= 0; i
< n
; i
++) {
250 #if CHAN_TYPE == GL_FLOAT
251 rgba
[i
][RCOMP
] = arg0
[i
][RCOMP
] * RGBmult
;
252 rgba
[i
][GCOMP
] = arg0
[i
][GCOMP
] * RGBmult
;
253 rgba
[i
][BCOMP
] = arg0
[i
][BCOMP
] * RGBmult
;
255 GLuint r
= (GLuint
) arg0
[i
][RCOMP
] << RGBshift
;
256 GLuint g
= (GLuint
) arg0
[i
][GCOMP
] << RGBshift
;
257 GLuint b
= (GLuint
) arg0
[i
][BCOMP
] << RGBshift
;
258 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
259 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
260 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
265 for (i
= 0; i
< n
; i
++) {
266 rgba
[i
][RCOMP
] = arg0
[i
][RCOMP
];
267 rgba
[i
][GCOMP
] = arg0
[i
][GCOMP
];
268 rgba
[i
][BCOMP
] = arg0
[i
][BCOMP
];
275 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
276 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
277 #if CHAN_TYPE != GL_FLOAT
278 const GLint shift
= CHAN_BITS
- RGBshift
;
280 for (i
= 0; i
< n
; i
++) {
281 #if CHAN_TYPE == GL_FLOAT
282 rgba
[i
][RCOMP
] = arg0
[i
][RCOMP
] * arg1
[i
][RCOMP
] * RGBmult
;
283 rgba
[i
][GCOMP
] = arg0
[i
][GCOMP
] * arg1
[i
][GCOMP
] * RGBmult
;
284 rgba
[i
][BCOMP
] = arg0
[i
][BCOMP
] * arg1
[i
][BCOMP
] * RGBmult
;
286 GLuint r
= PROD(arg0
[i
][RCOMP
], arg1
[i
][RCOMP
]) >> shift
;
287 GLuint g
= PROD(arg0
[i
][GCOMP
], arg1
[i
][GCOMP
]) >> shift
;
288 GLuint b
= PROD(arg0
[i
][BCOMP
], arg1
[i
][BCOMP
]) >> shift
;
289 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
290 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
291 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
298 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
299 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
300 for (i
= 0; i
< n
; i
++) {
301 #if CHAN_TYPE == GL_FLOAT
302 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] + arg1
[i
][RCOMP
]) * RGBmult
;
303 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] + arg1
[i
][GCOMP
]) * RGBmult
;
304 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] + arg1
[i
][BCOMP
]) * RGBmult
;
306 GLint r
= ((GLint
) arg0
[i
][RCOMP
] + (GLint
) arg1
[i
][RCOMP
]) << RGBshift
;
307 GLint g
= ((GLint
) arg0
[i
][GCOMP
] + (GLint
) arg1
[i
][GCOMP
]) << RGBshift
;
308 GLint b
= ((GLint
) arg0
[i
][BCOMP
] + (GLint
) arg1
[i
][BCOMP
]) << RGBshift
;
309 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
310 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
311 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
318 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
319 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
320 for (i
= 0; i
< n
; i
++) {
321 #if CHAN_TYPE == GL_FLOAT
322 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] + arg1
[i
][RCOMP
] - 0.5) * RGBmult
;
323 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] + arg1
[i
][GCOMP
] - 0.5) * RGBmult
;
324 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] + arg1
[i
][BCOMP
] - 0.5) * RGBmult
;
326 GLint r
= (GLint
) arg0
[i
][RCOMP
] + (GLint
) arg1
[i
][RCOMP
] -half
;
327 GLint g
= (GLint
) arg0
[i
][GCOMP
] + (GLint
) arg1
[i
][GCOMP
] -half
;
328 GLint b
= (GLint
) arg0
[i
][BCOMP
] + (GLint
) arg1
[i
][BCOMP
] -half
;
329 r
= (r
< 0) ? 0 : r
<< RGBshift
;
330 g
= (g
< 0) ? 0 : g
<< RGBshift
;
331 b
= (b
< 0) ? 0 : b
<< RGBshift
;
332 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
333 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
334 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
341 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
342 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
343 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
344 #if CHAN_TYPE != GL_FLOAT
345 const GLint shift
= CHAN_BITS
- RGBshift
;
347 for (i
= 0; i
< n
; i
++) {
348 #if CHAN_TYPE == GL_FLOAT
349 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] * arg2
[i
][RCOMP
] +
350 arg1
[i
][RCOMP
] * (CHAN_MAXF
- arg2
[i
][RCOMP
])) * RGBmult
;
351 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] * arg2
[i
][GCOMP
] +
352 arg1
[i
][GCOMP
] * (CHAN_MAXF
- arg2
[i
][GCOMP
])) * RGBmult
;
353 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] * arg2
[i
][BCOMP
] +
354 arg1
[i
][BCOMP
] * (CHAN_MAXF
- arg2
[i
][BCOMP
])) * RGBmult
;
356 GLuint r
= (PROD(arg0
[i
][RCOMP
], arg2
[i
][RCOMP
])
357 + PROD(arg1
[i
][RCOMP
], CHAN_MAX
- arg2
[i
][RCOMP
]))
359 GLuint g
= (PROD(arg0
[i
][GCOMP
], arg2
[i
][GCOMP
])
360 + PROD(arg1
[i
][GCOMP
], CHAN_MAX
- arg2
[i
][GCOMP
]))
362 GLuint b
= (PROD(arg0
[i
][BCOMP
], arg2
[i
][BCOMP
])
363 + PROD(arg1
[i
][BCOMP
], CHAN_MAX
- arg2
[i
][BCOMP
]))
365 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
366 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
367 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
374 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
375 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
376 for (i
= 0; i
< n
; i
++) {
377 #if CHAN_TYPE == GL_FLOAT
378 rgba
[i
][RCOMP
] = (arg0
[i
][RCOMP
] - arg1
[i
][RCOMP
]) * RGBmult
;
379 rgba
[i
][GCOMP
] = (arg0
[i
][GCOMP
] - arg1
[i
][GCOMP
]) * RGBmult
;
380 rgba
[i
][BCOMP
] = (arg0
[i
][BCOMP
] - arg1
[i
][BCOMP
]) * RGBmult
;
382 GLint r
= ((GLint
) arg0
[i
][RCOMP
] - (GLint
) arg1
[i
][RCOMP
]) << RGBshift
;
383 GLint g
= ((GLint
) arg0
[i
][GCOMP
] - (GLint
) arg1
[i
][GCOMP
]) << RGBshift
;
384 GLint b
= ((GLint
) arg0
[i
][BCOMP
] - (GLint
) arg1
[i
][BCOMP
]) << RGBshift
;
385 rgba
[i
][RCOMP
] = (GLchan
) CLAMP(r
, 0, CHAN_MAX
);
386 rgba
[i
][GCOMP
] = (GLchan
) CLAMP(g
, 0, CHAN_MAX
);
387 rgba
[i
][BCOMP
] = (GLchan
) CLAMP(b
, 0, CHAN_MAX
);
392 case GL_DOT3_RGB_EXT
:
393 case GL_DOT3_RGBA_EXT
:
395 /* Do not scale the result by 1 2 or 4 */
396 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
397 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
398 for (i
= 0; i
< n
; i
++) {
399 #if CHAN_TYPE == GL_FLOAT
400 GLchan dot
= ((arg0
[i
][RCOMP
]-0.5F
) * (arg1
[i
][RCOMP
]-0.5F
) +
401 (arg0
[i
][GCOMP
]-0.5F
) * (arg1
[i
][GCOMP
]-0.5F
) +
402 (arg0
[i
][BCOMP
]-0.5F
) * (arg1
[i
][BCOMP
]-0.5F
))
404 dot
= CLAMP(dot
, 0.0F
, CHAN_MAXF
);
406 GLint dot
= (S_PROD((GLint
)arg0
[i
][RCOMP
] - half
,
407 (GLint
)arg1
[i
][RCOMP
] - half
) +
408 S_PROD((GLint
)arg0
[i
][GCOMP
] - half
,
409 (GLint
)arg1
[i
][GCOMP
] - half
) +
410 S_PROD((GLint
)arg0
[i
][BCOMP
] - half
,
411 (GLint
)arg1
[i
][BCOMP
] - half
)) >> 6;
412 dot
= CLAMP(dot
, 0, CHAN_MAX
);
414 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = (GLchan
) dot
;
421 /* DO scale the result by 1 2 or 4 */
422 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
423 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
424 for (i
= 0; i
< n
; i
++) {
425 #if CHAN_TYPE == GL_FLOAT
426 GLchan dot
= ((arg0
[i
][RCOMP
]-0.5F
) * (arg1
[i
][RCOMP
]-0.5F
) +
427 (arg0
[i
][GCOMP
]-0.5F
) * (arg1
[i
][GCOMP
]-0.5F
) +
428 (arg0
[i
][BCOMP
]-0.5F
) * (arg1
[i
][BCOMP
]-0.5F
))
430 dot
= CLAMP(dot
, 0.0, CHAN_MAXF
);
432 GLint dot
= (S_PROD((GLint
)arg0
[i
][RCOMP
] - half
,
433 (GLint
)arg1
[i
][RCOMP
] - half
) +
434 S_PROD((GLint
)arg0
[i
][GCOMP
] - half
,
435 (GLint
)arg1
[i
][GCOMP
] - half
) +
436 S_PROD((GLint
)arg0
[i
][BCOMP
] - half
,
437 (GLint
)arg1
[i
][BCOMP
] - half
)) >> 6;
439 dot
= CLAMP(dot
, 0, CHAN_MAX
);
441 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = (GLchan
) dot
;
445 case GL_MODULATE_ADD_ATI
:
447 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
448 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
449 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
450 #if CHAN_TYPE != GL_FLOAT
451 const GLint shift
= CHAN_BITS
- RGBshift
;
453 for (i
= 0; i
< n
; i
++) {
454 #if CHAN_TYPE == GL_FLOAT
455 rgba
[i
][RCOMP
] = ((arg0
[i
][RCOMP
] * arg2
[i
][RCOMP
]) + arg1
[i
][RCOMP
]) * RGBmult
;
456 rgba
[i
][GCOMP
] = ((arg0
[i
][GCOMP
] * arg2
[i
][GCOMP
]) + arg1
[i
][GCOMP
]) * RGBmult
;
457 rgba
[i
][BCOMP
] = ((arg0
[i
][BCOMP
] * arg2
[i
][BCOMP
]) + arg1
[i
][BCOMP
]) * RGBmult
;
459 GLuint r
= (PROD(arg0
[i
][RCOMP
], arg2
[i
][RCOMP
])
460 + ((GLuint
) arg1
[i
][RCOMP
] << CHAN_BITS
)) >> shift
;
461 GLuint g
= (PROD(arg0
[i
][GCOMP
], arg2
[i
][GCOMP
])
462 + ((GLuint
) arg1
[i
][GCOMP
] << CHAN_BITS
)) >> shift
;
463 GLuint b
= (PROD(arg0
[i
][BCOMP
], arg2
[i
][BCOMP
])
464 + ((GLuint
) arg1
[i
][BCOMP
] << CHAN_BITS
)) >> shift
;
465 rgba
[i
][RCOMP
] = (GLchan
) MIN2(r
, CHAN_MAX
);
466 rgba
[i
][GCOMP
] = (GLchan
) MIN2(g
, CHAN_MAX
);
467 rgba
[i
][BCOMP
] = (GLchan
) MIN2(b
, CHAN_MAX
);
472 case GL_MODULATE_SIGNED_ADD_ATI
:
474 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
475 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
476 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
477 #if CHAN_TYPE != GL_FLOAT
478 const GLint shift
= CHAN_BITS
- RGBshift
;
480 for (i
= 0; i
< n
; i
++) {
481 #if CHAN_TYPE == GL_FLOAT
482 rgba
[i
][RCOMP
] = ((arg0
[i
][RCOMP
] * arg2
[i
][RCOMP
]) + arg1
[i
][RCOMP
] - 0.5) * RGBmult
;
483 rgba
[i
][GCOMP
] = ((arg0
[i
][GCOMP
] * arg2
[i
][GCOMP
]) + arg1
[i
][GCOMP
] - 0.5) * RGBmult
;
484 rgba
[i
][BCOMP
] = ((arg0
[i
][BCOMP
] * arg2
[i
][BCOMP
]) + arg1
[i
][BCOMP
] - 0.5) * RGBmult
;
486 GLint r
= (S_PROD(arg0
[i
][RCOMP
], arg2
[i
][RCOMP
])
487 + (((GLint
) arg1
[i
][RCOMP
] - half
) << CHAN_BITS
))
489 GLint g
= (S_PROD(arg0
[i
][GCOMP
], arg2
[i
][GCOMP
])
490 + (((GLint
) arg1
[i
][GCOMP
] - half
) << CHAN_BITS
))
492 GLint b
= (S_PROD(arg0
[i
][BCOMP
], arg2
[i
][BCOMP
])
493 + (((GLint
) arg1
[i
][BCOMP
] - half
) << CHAN_BITS
))
495 rgba
[i
][RCOMP
] = (GLchan
) CLAMP(r
, 0, CHAN_MAX
);
496 rgba
[i
][GCOMP
] = (GLchan
) CLAMP(g
, 0, CHAN_MAX
);
497 rgba
[i
][BCOMP
] = (GLchan
) CLAMP(b
, 0, CHAN_MAX
);
502 case GL_MODULATE_SUBTRACT_ATI
:
504 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argRGB
[0];
505 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argRGB
[1];
506 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argRGB
[2];
507 #if CHAN_TYPE != GL_FLOAT
508 const GLint shift
= CHAN_BITS
- RGBshift
;
510 for (i
= 0; i
< n
; i
++) {
511 #if CHAN_TYPE == GL_FLOAT
512 rgba
[i
][RCOMP
] = ((arg0
[i
][RCOMP
] * arg2
[i
][RCOMP
]) - arg1
[i
][RCOMP
]) * RGBmult
;
513 rgba
[i
][GCOMP
] = ((arg0
[i
][GCOMP
] * arg2
[i
][GCOMP
]) - arg1
[i
][GCOMP
]) * RGBmult
;
514 rgba
[i
][BCOMP
] = ((arg0
[i
][BCOMP
] * arg2
[i
][BCOMP
]) - arg1
[i
][BCOMP
]) * RGBmult
;
516 GLint r
= (S_PROD(arg0
[i
][RCOMP
], arg2
[i
][RCOMP
])
517 - ((GLint
) arg1
[i
][RCOMP
] << CHAN_BITS
))
519 GLint g
= (S_PROD(arg0
[i
][GCOMP
], arg2
[i
][GCOMP
])
520 - ((GLint
) arg1
[i
][GCOMP
] << CHAN_BITS
))
522 GLint b
= (S_PROD(arg0
[i
][BCOMP
], arg2
[i
][BCOMP
])
523 - ((GLint
) arg1
[i
][BCOMP
] << CHAN_BITS
))
525 rgba
[i
][RCOMP
] = (GLchan
) CLAMP(r
, 0, CHAN_MAX
);
526 rgba
[i
][GCOMP
] = (GLchan
) CLAMP(g
, 0, CHAN_MAX
);
527 rgba
[i
][BCOMP
] = (GLchan
) CLAMP(b
, 0, CHAN_MAX
);
533 _mesa_problem(ctx
, "invalid combine mode");
536 switch (textureUnit
->_CurrentCombine
->ModeA
) {
539 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
541 for (i
= 0; i
< n
; i
++) {
542 #if CHAN_TYPE == GL_FLOAT
543 GLchan a
= arg0
[i
][ACOMP
] * Amult
;
545 GLuint a
= (GLuint
) arg0
[i
][ACOMP
] << Ashift
;
547 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
551 for (i
= 0; i
< n
; i
++) {
552 rgba
[i
][ACOMP
] = arg0
[i
][ACOMP
];
559 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
560 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
561 #if CHAN_TYPE != GL_FLOAT
562 const GLint shift
= CHAN_BITS
- Ashift
;
564 for (i
= 0; i
< n
; i
++) {
565 #if CHAN_TYPE == GL_FLOAT
566 rgba
[i
][ACOMP
] = arg0
[i
][ACOMP
] * arg1
[i
][ACOMP
] * Amult
;
568 GLuint a
= (PROD(arg0
[i
][ACOMP
], arg1
[i
][ACOMP
]) >> shift
);
569 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
576 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
577 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
578 for (i
= 0; i
< n
; i
++) {
579 #if CHAN_TYPE == GL_FLOAT
580 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] + arg1
[i
][ACOMP
]) * Amult
;
582 GLint a
= ((GLint
) arg0
[i
][ACOMP
] + arg1
[i
][ACOMP
]) << Ashift
;
583 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
590 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
591 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
592 for (i
= 0; i
< n
; i
++) {
593 #if CHAN_TYPE == GL_FLOAT
594 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] + arg1
[i
][ACOMP
] - 0.5F
) * Amult
;
596 GLint a
= (GLint
) arg0
[i
][ACOMP
] + (GLint
) arg1
[i
][ACOMP
] -half
;
597 a
= (a
< 0) ? 0 : a
<< Ashift
;
598 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
605 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
606 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
607 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
608 #if CHAN_TYPE != GL_FLOAT
609 const GLint shift
= CHAN_BITS
- Ashift
;
611 for (i
=0; i
<n
; i
++) {
612 #if CHAN_TYPE == GL_FLOAT
613 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] * arg2
[i
][ACOMP
] +
614 arg1
[i
][ACOMP
] * (CHAN_MAXF
- arg2
[i
][ACOMP
]))
617 GLuint a
= (PROD(arg0
[i
][ACOMP
], arg2
[i
][ACOMP
])
618 + PROD(arg1
[i
][ACOMP
], CHAN_MAX
- arg2
[i
][ACOMP
]))
620 rgba
[i
][ACOMP
] = (GLchan
) MIN2(a
, CHAN_MAX
);
627 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
628 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
629 for (i
= 0; i
< n
; i
++) {
630 #if CHAN_TYPE == GL_FLOAT
631 rgba
[i
][ACOMP
] = (arg0
[i
][ACOMP
] - arg1
[i
][ACOMP
]) * Amult
;
633 GLint a
= ((GLint
) arg0
[i
][ACOMP
] - (GLint
) arg1
[i
][ACOMP
]) << Ashift
;
634 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
639 case GL_MODULATE_ADD_ATI
:
641 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
642 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
643 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
644 #if CHAN_TYPE != GL_FLOAT
645 const GLint shift
= CHAN_BITS
- Ashift
;
647 for (i
= 0; i
< n
; i
++) {
648 #if CHAN_TYPE == GL_FLOAT
649 rgba
[i
][ACOMP
] = ((arg0
[i
][ACOMP
] * arg2
[i
][ACOMP
]) + arg1
[i
][ACOMP
]) * Amult
;
651 GLint a
= (PROD(arg0
[i
][ACOMP
], arg2
[i
][ACOMP
])
652 + ((GLuint
) arg1
[i
][ACOMP
] << CHAN_BITS
))
654 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
659 case GL_MODULATE_SIGNED_ADD_ATI
:
661 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
662 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
663 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
664 #if CHAN_TYPE != GL_FLOAT
665 const GLint shift
= CHAN_BITS
- Ashift
;
667 for (i
= 0; i
< n
; i
++) {
668 #if CHAN_TYPE == GL_FLOAT
669 rgba
[i
][ACOMP
] = ((arg0
[i
][ACOMP
] * arg2
[i
][ACOMP
]) + arg1
[i
][ACOMP
] - 0.5F
) * Amult
;
671 GLint a
= (S_PROD(arg0
[i
][ACOMP
], arg2
[i
][ACOMP
])
672 + (((GLint
) arg1
[i
][ACOMP
] - half
) << CHAN_BITS
))
674 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
679 case GL_MODULATE_SUBTRACT_ATI
:
681 const GLchan (*arg0
)[4] = (const GLchan (*)[4]) argA
[0];
682 const GLchan (*arg1
)[4] = (const GLchan (*)[4]) argA
[1];
683 const GLchan (*arg2
)[4] = (const GLchan (*)[4]) argA
[2];
684 #if CHAN_TYPE != GL_FLOAT
685 const GLint shift
= CHAN_BITS
- Ashift
;
687 for (i
= 0; i
< n
; i
++) {
688 #if CHAN_TYPE == GL_FLOAT
689 rgba
[i
][ACOMP
] = ((arg0
[i
][ACOMP
] * arg2
[i
][ACOMP
]) - arg1
[i
][ACOMP
]) * Amult
;
691 GLint a
= (S_PROD(arg0
[i
][ACOMP
], arg2
[i
][ACOMP
])
692 - ((GLint
) arg1
[i
][ACOMP
] << CHAN_BITS
))
694 rgba
[i
][ACOMP
] = (GLchan
) CLAMP(a
, 0, CHAN_MAX
);
700 _mesa_problem(ctx
, "invalid combine mode");
703 /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining.
704 * This is kind of a kludge. It would have been better if the spec
705 * were written such that the GL_COMBINE_ALPHA value could be set to
708 if (textureUnit
->_CurrentCombine
->ModeRGB
== GL_DOT3_RGBA_EXT
||
709 textureUnit
->_CurrentCombine
->ModeRGB
== GL_DOT3_RGBA
) {
710 for (i
= 0; i
< n
; i
++) {
711 rgba
[i
][ACOMP
] = rgba
[i
][RCOMP
];
719 * Apply a conventional OpenGL texture env mode (REPLACE, ADD, BLEND,
720 * MODULATE, or DECAL) to an array of fragments.
721 * Input: textureUnit - pointer to texture unit to apply
722 * format - base internal texture format
723 * n - number of fragments
724 * primary_rgba - primary colors (may alias rgba for single texture)
725 * texels - array of texel colors
726 * InOut: rgba - incoming fragment colors modified by texel colors
727 * according to the texture environment mode.
730 texture_apply( const GLcontext
*ctx
,
731 const struct gl_texture_unit
*texUnit
,
733 CONST GLchan primary_rgba
[][4], CONST GLchan texel
[][4],
738 GLchan Rc
, Gc
, Bc
, Ac
;
743 ASSERT(texUnit
->_Current
);
745 baseLevel
= texUnit
->_Current
->BaseLevel
;
746 ASSERT(texUnit
->_Current
->Image
[0][baseLevel
]);
748 format
= texUnit
->_Current
->Image
[0][baseLevel
]->_BaseFormat
;
750 if (format
== GL_COLOR_INDEX
|| format
== GL_YCBCR_MESA
) {
751 format
= GL_RGBA
; /* a bit of a hack */
753 else if (format
== GL_DEPTH_COMPONENT
|| format
== GL_DEPTH_STENCIL_EXT
) {
754 format
= texUnit
->_Current
->DepthMode
;
757 switch (texUnit
->EnvMode
) {
764 rgba
[i
][ACOMP
] = texel
[i
][ACOMP
];
770 GLchan Lt
= texel
[i
][RCOMP
];
771 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = Lt
;
775 case GL_LUMINANCE_ALPHA
:
777 GLchan Lt
= texel
[i
][RCOMP
];
779 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = Lt
;
781 rgba
[i
][ACOMP
] = texel
[i
][ACOMP
];
787 GLchan It
= texel
[i
][RCOMP
];
788 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = It
;
796 rgba
[i
][RCOMP
] = texel
[i
][RCOMP
];
797 rgba
[i
][GCOMP
] = texel
[i
][GCOMP
];
798 rgba
[i
][BCOMP
] = texel
[i
][BCOMP
];
805 rgba
[i
][RCOMP
] = texel
[i
][RCOMP
];
806 rgba
[i
][GCOMP
] = texel
[i
][GCOMP
];
807 rgba
[i
][BCOMP
] = texel
[i
][BCOMP
];
809 rgba
[i
][ACOMP
] = texel
[i
][ACOMP
];
813 _mesa_problem(ctx
, "Bad format (GL_REPLACE) in texture_apply");
824 rgba
[i
][ACOMP
] = CHAN_PRODUCT( rgba
[i
][ACOMP
], texel
[i
][ACOMP
] );
830 GLchan Lt
= texel
[i
][RCOMP
];
831 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], Lt
);
832 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], Lt
);
833 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], Lt
);
837 case GL_LUMINANCE_ALPHA
:
840 GLchan Lt
= texel
[i
][RCOMP
];
841 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], Lt
);
842 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], Lt
);
843 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], Lt
);
845 rgba
[i
][ACOMP
] = CHAN_PRODUCT( rgba
[i
][ACOMP
], texel
[i
][ACOMP
] );
851 GLchan It
= texel
[i
][RCOMP
];
852 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], It
);
853 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], It
);
854 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], It
);
856 rgba
[i
][ACOMP
] = CHAN_PRODUCT( rgba
[i
][ACOMP
], It
);
862 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], texel
[i
][RCOMP
] );
863 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], texel
[i
][GCOMP
] );
864 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], texel
[i
][BCOMP
] );
871 rgba
[i
][RCOMP
] = CHAN_PRODUCT( rgba
[i
][RCOMP
], texel
[i
][RCOMP
] );
872 rgba
[i
][GCOMP
] = CHAN_PRODUCT( rgba
[i
][GCOMP
], texel
[i
][GCOMP
] );
873 rgba
[i
][BCOMP
] = CHAN_PRODUCT( rgba
[i
][BCOMP
], texel
[i
][BCOMP
] );
875 rgba
[i
][ACOMP
] = CHAN_PRODUCT( rgba
[i
][ACOMP
], texel
[i
][ACOMP
] );
879 _mesa_problem(ctx
, "Bad format (GL_MODULATE) in texture_apply");
888 case GL_LUMINANCE_ALPHA
:
895 rgba
[i
][RCOMP
] = texel
[i
][RCOMP
];
896 rgba
[i
][GCOMP
] = texel
[i
][GCOMP
];
897 rgba
[i
][BCOMP
] = texel
[i
][BCOMP
];
903 /* Cv = Cf(1-At) + CtAt */
904 GLchan t
= texel
[i
][ACOMP
], s
= CHAN_MAX
- t
;
905 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], s
) + CHAN_PRODUCT(texel
[i
][RCOMP
],t
);
906 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], s
) + CHAN_PRODUCT(texel
[i
][GCOMP
],t
);
907 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], s
) + CHAN_PRODUCT(texel
[i
][BCOMP
],t
);
912 _mesa_problem(ctx
, "Bad format (GL_DECAL) in texture_apply");
918 UNCLAMPED_FLOAT_TO_CHAN(Rc
, texUnit
->EnvColor
[0]);
919 UNCLAMPED_FLOAT_TO_CHAN(Gc
, texUnit
->EnvColor
[1]);
920 UNCLAMPED_FLOAT_TO_CHAN(Bc
, texUnit
->EnvColor
[2]);
921 UNCLAMPED_FLOAT_TO_CHAN(Ac
, texUnit
->EnvColor
[3]);
927 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], texel
[i
][ACOMP
]);
932 /* Cv = Cf(1-Lt) + CcLt */
933 GLchan Lt
= texel
[i
][RCOMP
], s
= CHAN_MAX
- Lt
;
934 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], s
) + CHAN_PRODUCT(Rc
, Lt
);
935 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], s
) + CHAN_PRODUCT(Gc
, Lt
);
936 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], s
) + CHAN_PRODUCT(Bc
, Lt
);
940 case GL_LUMINANCE_ALPHA
:
942 /* Cv = Cf(1-Lt) + CcLt */
943 GLchan Lt
= texel
[i
][RCOMP
], s
= CHAN_MAX
- Lt
;
944 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], s
) + CHAN_PRODUCT(Rc
, Lt
);
945 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], s
) + CHAN_PRODUCT(Gc
, Lt
);
946 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], s
) + CHAN_PRODUCT(Bc
, Lt
);
948 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
],texel
[i
][ACOMP
]);
953 /* Cv = Cf(1-It) + CcIt */
954 GLchan It
= texel
[i
][RCOMP
], s
= CHAN_MAX
- It
;
955 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], s
) + CHAN_PRODUCT(Rc
, It
);
956 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], s
) + CHAN_PRODUCT(Gc
, It
);
957 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], s
) + CHAN_PRODUCT(Bc
, It
);
958 /* Av = Af(1-It) + Ac*It */
959 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], s
) + CHAN_PRODUCT(Ac
, It
);
964 /* Cv = Cf(1-Ct) + CcCt */
965 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], (CHAN_MAX
-texel
[i
][RCOMP
])) + CHAN_PRODUCT(Rc
,texel
[i
][RCOMP
]);
966 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], (CHAN_MAX
-texel
[i
][GCOMP
])) + CHAN_PRODUCT(Gc
,texel
[i
][GCOMP
]);
967 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], (CHAN_MAX
-texel
[i
][BCOMP
])) + CHAN_PRODUCT(Bc
,texel
[i
][BCOMP
]);
973 /* Cv = Cf(1-Ct) + CcCt */
974 rgba
[i
][RCOMP
] = CHAN_PRODUCT(rgba
[i
][RCOMP
], (CHAN_MAX
-texel
[i
][RCOMP
])) + CHAN_PRODUCT(Rc
,texel
[i
][RCOMP
]);
975 rgba
[i
][GCOMP
] = CHAN_PRODUCT(rgba
[i
][GCOMP
], (CHAN_MAX
-texel
[i
][GCOMP
])) + CHAN_PRODUCT(Gc
,texel
[i
][GCOMP
]);
976 rgba
[i
][BCOMP
] = CHAN_PRODUCT(rgba
[i
][BCOMP
], (CHAN_MAX
-texel
[i
][BCOMP
])) + CHAN_PRODUCT(Bc
,texel
[i
][BCOMP
]);
978 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
],texel
[i
][ACOMP
]);
982 _mesa_problem(ctx
, "Bad format (GL_BLEND) in texture_apply");
987 /* XXX don't clamp results if GLchan is float??? */
989 case GL_ADD
: /* GL_EXT_texture_add_env */
996 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], texel
[i
][ACOMP
]);
1001 ChanTemp Lt
= texel
[i
][RCOMP
];
1002 ChanTemp r
= rgba
[i
][RCOMP
] + Lt
;
1003 ChanTemp g
= rgba
[i
][GCOMP
] + Lt
;
1004 ChanTemp b
= rgba
[i
][BCOMP
] + Lt
;
1005 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1006 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1007 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1011 case GL_LUMINANCE_ALPHA
:
1013 ChanTemp Lt
= texel
[i
][RCOMP
];
1014 ChanTemp r
= rgba
[i
][RCOMP
] + Lt
;
1015 ChanTemp g
= rgba
[i
][GCOMP
] + Lt
;
1016 ChanTemp b
= rgba
[i
][BCOMP
] + Lt
;
1017 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1018 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1019 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1020 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], texel
[i
][ACOMP
]);
1025 GLchan It
= texel
[i
][RCOMP
];
1026 ChanTemp r
= rgba
[i
][RCOMP
] + It
;
1027 ChanTemp g
= rgba
[i
][GCOMP
] + It
;
1028 ChanTemp b
= rgba
[i
][BCOMP
] + It
;
1029 ChanTemp a
= rgba
[i
][ACOMP
] + It
;
1030 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1031 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1032 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1033 rgba
[i
][ACOMP
] = MIN2(a
, CHAN_MAX
);
1038 ChanTemp r
= rgba
[i
][RCOMP
] + texel
[i
][RCOMP
];
1039 ChanTemp g
= rgba
[i
][GCOMP
] + texel
[i
][GCOMP
];
1040 ChanTemp b
= rgba
[i
][BCOMP
] + texel
[i
][BCOMP
];
1041 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1042 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1043 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1049 ChanTemp r
= rgba
[i
][RCOMP
] + texel
[i
][RCOMP
];
1050 ChanTemp g
= rgba
[i
][GCOMP
] + texel
[i
][GCOMP
];
1051 ChanTemp b
= rgba
[i
][BCOMP
] + texel
[i
][BCOMP
];
1052 rgba
[i
][RCOMP
] = MIN2(r
, CHAN_MAX
);
1053 rgba
[i
][GCOMP
] = MIN2(g
, CHAN_MAX
);
1054 rgba
[i
][BCOMP
] = MIN2(b
, CHAN_MAX
);
1055 rgba
[i
][ACOMP
] = CHAN_PRODUCT(rgba
[i
][ACOMP
], texel
[i
][ACOMP
]);
1059 _mesa_problem(ctx
, "Bad format (GL_ADD) in texture_apply");
1065 _mesa_problem(ctx
, "Bad env mode in texture_apply");
1073 * Apply texture mapping to a span of fragments.
1076 _swrast_texture_span( GLcontext
*ctx
, SWspan
*span
)
1078 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
1079 GLchan primary_rgba
[MAX_WIDTH
][4];
1082 ASSERT(span
->end
< MAX_WIDTH
);
1083 ASSERT(span
->arrayMask
& SPAN_TEXTURE
);
1086 * Save copy of the incoming fragment colors (the GL_PRIMARY_COLOR)
1088 if (swrast
->_AnyTextureCombine
)
1089 MEMCPY(primary_rgba
, span
->array
->rgba
, 4 * span
->end
* sizeof(GLchan
));
1092 * Must do all texture sampling before combining in order to
1093 * accomodate GL_ARB_texture_env_crossbar.
1095 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++) {
1096 if (ctx
->Texture
.Unit
[unit
]._ReallyEnabled
) {
1097 const struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
1098 const struct gl_texture_object
*curObj
= texUnit
->_Current
;
1099 GLfloat
*lambda
= span
->array
->lambda
[unit
];
1100 GLchan (*texels
)[4] = (GLchan (*)[4])
1101 (swrast
->TexelBuffer
+ unit
* (span
->end
* 4 * sizeof(GLchan
)));
1103 /* adjust texture lod (lambda) */
1104 if (span
->arrayMask
& SPAN_LAMBDA
) {
1105 if (texUnit
->LodBias
+ curObj
->LodBias
!= 0.0F
) {
1106 /* apply LOD bias, but don't clamp yet */
1107 const GLfloat bias
= CLAMP(texUnit
->LodBias
+ curObj
->LodBias
,
1108 -ctx
->Const
.MaxTextureLodBias
,
1109 ctx
->Const
.MaxTextureLodBias
);
1111 for (i
= 0; i
< span
->end
; i
++) {
1116 if (curObj
->MinLod
!= -1000.0 || curObj
->MaxLod
!= 1000.0) {
1117 /* apply LOD clamping to lambda */
1118 const GLfloat min
= curObj
->MinLod
;
1119 const GLfloat max
= curObj
->MaxLod
;
1121 for (i
= 0; i
< span
->end
; i
++) {
1122 GLfloat l
= lambda
[i
];
1123 lambda
[i
] = CLAMP(l
, min
, max
);
1128 /* Sample the texture (span->end = number of fragments) */
1129 swrast
->TextureSample
[unit
]( ctx
, texUnit
->_Current
, span
->end
,
1130 (const GLfloat (*)[4]) span
->array
->texcoords
[unit
],
1133 /* GL_SGI_texture_color_table */
1134 if (texUnit
->ColorTableEnabled
) {
1135 _mesa_lookup_rgba_chan(&texUnit
->ColorTable
, span
->end
, texels
);
1141 * OK, now apply the texture (aka texture combine/blend).
1142 * We modify the span->color.rgba values.
1144 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++) {
1145 if (ctx
->Texture
.Unit
[unit
]._ReallyEnabled
) {
1146 const struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[unit
];
1147 if (texUnit
->_CurrentCombine
!= &texUnit
->_EnvMode
) {
1148 texture_combine( ctx
, unit
, span
->end
,
1149 (CONST
GLchan (*)[4]) primary_rgba
,
1150 swrast
->TexelBuffer
,
1151 span
->array
->rgba
);
1154 /* conventional texture blend */
1155 const GLchan (*texels
)[4] = (const GLchan (*)[4])
1156 (swrast
->TexelBuffer
+ unit
*
1157 (span
->end
* 4 * sizeof(GLchan
)));
1158 texture_apply( ctx
, texUnit
, span
->end
,
1159 (CONST
GLchan (*)[4]) primary_rgba
, texels
,
1160 span
->array
->rgba
);