2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
5 * Copyright (C) 2009-2010 VMware, Inc. 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 * THE AUTHORS 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.
27 * \file pixeltransfer.c
28 * Pixel transfer operations (scale, bias, table lookups, etc)
34 #include "pixeltransfer.h"
40 * Apply scale and bias factors to an array of RGBA pixels.
43 _mesa_scale_and_bias_rgba(GLuint n
, GLfloat rgba
[][4],
44 GLfloat rScale
, GLfloat gScale
,
45 GLfloat bScale
, GLfloat aScale
,
46 GLfloat rBias
, GLfloat gBias
,
47 GLfloat bBias
, GLfloat aBias
)
49 if (rScale
!= 1.0 || rBias
!= 0.0) {
51 for (i
= 0; i
< n
; i
++) {
52 rgba
[i
][RCOMP
] = rgba
[i
][RCOMP
] * rScale
+ rBias
;
55 if (gScale
!= 1.0 || gBias
!= 0.0) {
57 for (i
= 0; i
< n
; i
++) {
58 rgba
[i
][GCOMP
] = rgba
[i
][GCOMP
] * gScale
+ gBias
;
61 if (bScale
!= 1.0 || bBias
!= 0.0) {
63 for (i
= 0; i
< n
; i
++) {
64 rgba
[i
][BCOMP
] = rgba
[i
][BCOMP
] * bScale
+ bBias
;
67 if (aScale
!= 1.0 || aBias
!= 0.0) {
69 for (i
= 0; i
< n
; i
++) {
70 rgba
[i
][ACOMP
] = rgba
[i
][ACOMP
] * aScale
+ aBias
;
77 * Apply pixel mapping to an array of floating point RGBA pixels.
80 _mesa_map_rgba( const struct gl_context
*ctx
, GLuint n
, GLfloat rgba
[][4] )
82 const GLfloat rscale
= (GLfloat
) (ctx
->PixelMaps
.RtoR
.Size
- 1);
83 const GLfloat gscale
= (GLfloat
) (ctx
->PixelMaps
.GtoG
.Size
- 1);
84 const GLfloat bscale
= (GLfloat
) (ctx
->PixelMaps
.BtoB
.Size
- 1);
85 const GLfloat ascale
= (GLfloat
) (ctx
->PixelMaps
.AtoA
.Size
- 1);
86 const GLfloat
*rMap
= ctx
->PixelMaps
.RtoR
.Map
;
87 const GLfloat
*gMap
= ctx
->PixelMaps
.GtoG
.Map
;
88 const GLfloat
*bMap
= ctx
->PixelMaps
.BtoB
.Map
;
89 const GLfloat
*aMap
= ctx
->PixelMaps
.AtoA
.Map
;
92 GLfloat r
= CLAMP(rgba
[i
][RCOMP
], 0.0F
, 1.0F
);
93 GLfloat g
= CLAMP(rgba
[i
][GCOMP
], 0.0F
, 1.0F
);
94 GLfloat b
= CLAMP(rgba
[i
][BCOMP
], 0.0F
, 1.0F
);
95 GLfloat a
= CLAMP(rgba
[i
][ACOMP
], 0.0F
, 1.0F
);
96 rgba
[i
][RCOMP
] = rMap
[IROUND(r
* rscale
)];
97 rgba
[i
][GCOMP
] = gMap
[IROUND(g
* gscale
)];
98 rgba
[i
][BCOMP
] = bMap
[IROUND(b
* bscale
)];
99 rgba
[i
][ACOMP
] = aMap
[IROUND(a
* ascale
)];
104 * Apply a color table lookup to an array of floating point RGBA colors.
107 _mesa_lookup_rgba_float(const struct gl_color_table
*table
,
108 GLuint n
, GLfloat rgba
[][4])
110 const GLint max
= table
->Size
- 1;
111 const GLfloat scale
= (GLfloat
) max
;
112 const GLfloat
*lut
= table
->TableF
;
115 if (!table
->TableF
|| table
->Size
== 0)
118 switch (table
->_BaseFormat
) {
120 /* replace RGBA with I */
121 for (i
= 0; i
< n
; i
++) {
122 GLint j
= IROUND(rgba
[i
][RCOMP
] * scale
);
123 GLfloat c
= lut
[CLAMP(j
, 0, max
)];
131 /* replace RGB with L */
132 for (i
= 0; i
< n
; i
++) {
133 GLint j
= IROUND(rgba
[i
][RCOMP
] * scale
);
134 GLfloat c
= lut
[CLAMP(j
, 0, max
)];
141 /* replace A with A */
142 for (i
= 0; i
< n
; i
++) {
143 GLint j
= IROUND(rgba
[i
][ACOMP
] * scale
);
144 rgba
[i
][ACOMP
] = lut
[CLAMP(j
, 0, max
)];
147 case GL_LUMINANCE_ALPHA
:
148 /* replace RGBA with LLLA */
149 for (i
= 0; i
< n
; i
++) {
150 GLint jL
= IROUND(rgba
[i
][RCOMP
] * scale
);
151 GLint jA
= IROUND(rgba
[i
][ACOMP
] * scale
);
152 GLfloat luminance
, alpha
;
153 jL
= CLAMP(jL
, 0, max
);
154 jA
= CLAMP(jA
, 0, max
);
155 luminance
= lut
[jL
* 2 + 0];
156 alpha
= lut
[jA
* 2 + 1];
159 rgba
[i
][BCOMP
] = luminance
;
160 rgba
[i
][ACOMP
] = alpha
;;
164 /* replace RGB with RGB */
165 for (i
= 0; i
< n
; i
++) {
166 GLint jR
= IROUND(rgba
[i
][RCOMP
] * scale
);
167 jR
= CLAMP(jR
, 0, max
);
168 rgba
[i
][RCOMP
] = lut
[jR
* 3 + 0];
172 /* replace RG with RG */
173 for (i
= 0; i
< n
; i
++) {
174 GLint jR
= IROUND(rgba
[i
][RCOMP
] * scale
);
175 GLint jG
= IROUND(rgba
[i
][GCOMP
] * scale
);
176 jR
= CLAMP(jR
, 0, max
);
177 jG
= CLAMP(jG
, 0, max
);
178 rgba
[i
][RCOMP
] = lut
[jR
* 3 + 0];
179 rgba
[i
][GCOMP
] = lut
[jG
* 3 + 1];
183 /* replace RGB with RGB */
184 for (i
= 0; i
< n
; i
++) {
185 GLint jR
= IROUND(rgba
[i
][RCOMP
] * scale
);
186 GLint jG
= IROUND(rgba
[i
][GCOMP
] * scale
);
187 GLint jB
= IROUND(rgba
[i
][BCOMP
] * scale
);
188 jR
= CLAMP(jR
, 0, max
);
189 jG
= CLAMP(jG
, 0, max
);
190 jB
= CLAMP(jB
, 0, max
);
191 rgba
[i
][RCOMP
] = lut
[jR
* 3 + 0];
192 rgba
[i
][GCOMP
] = lut
[jG
* 3 + 1];
193 rgba
[i
][BCOMP
] = lut
[jB
* 3 + 2];
197 /* replace RGBA with RGBA */
198 for (i
= 0; i
< n
; i
++) {
199 GLint jR
= IROUND(rgba
[i
][RCOMP
] * scale
);
200 GLint jG
= IROUND(rgba
[i
][GCOMP
] * scale
);
201 GLint jB
= IROUND(rgba
[i
][BCOMP
] * scale
);
202 GLint jA
= IROUND(rgba
[i
][ACOMP
] * scale
);
203 jR
= CLAMP(jR
, 0, max
);
204 jG
= CLAMP(jG
, 0, max
);
205 jB
= CLAMP(jB
, 0, max
);
206 jA
= CLAMP(jA
, 0, max
);
207 rgba
[i
][RCOMP
] = lut
[jR
* 4 + 0];
208 rgba
[i
][GCOMP
] = lut
[jG
* 4 + 1];
209 rgba
[i
][BCOMP
] = lut
[jB
* 4 + 2];
210 rgba
[i
][ACOMP
] = lut
[jA
* 4 + 3];
214 _mesa_problem(NULL
, "Bad format in _mesa_lookup_rgba_float");
222 * Apply a color table lookup to an array of ubyte/RGBA colors.
225 _mesa_lookup_rgba_ubyte(const struct gl_color_table
*table
,
226 GLuint n
, GLubyte rgba
[][4])
228 const GLubyte
*lut
= table
->TableUB
;
229 const GLfloat scale
= (GLfloat
) (table
->Size
- 1) / (GLfloat
)255.0;
232 if (!table
->TableUB
|| table
->Size
== 0)
235 switch (table
->_BaseFormat
) {
237 /* replace RGBA with I */
238 if (table
->Size
== 256) {
239 for (i
= 0; i
< n
; i
++) {
240 const GLubyte c
= lut
[rgba
[i
][RCOMP
]];
248 for (i
= 0; i
< n
; i
++) {
249 GLint j
= IROUND((GLfloat
) rgba
[i
][RCOMP
] * scale
);
253 rgba
[i
][ACOMP
] = lut
[j
];
258 /* replace RGB with L */
259 if (table
->Size
== 256) {
260 for (i
= 0; i
< n
; i
++) {
261 const GLubyte c
= lut
[rgba
[i
][RCOMP
]];
268 for (i
= 0; i
< n
; i
++) {
269 GLint j
= IROUND((GLfloat
) rgba
[i
][RCOMP
] * scale
);
272 rgba
[i
][BCOMP
] = lut
[j
];
277 /* replace A with A */
278 if (table
->Size
== 256) {
279 for (i
= 0; i
< n
; i
++) {
280 rgba
[i
][ACOMP
] = lut
[rgba
[i
][ACOMP
]];
284 for (i
= 0; i
< n
; i
++) {
285 GLint j
= IROUND((GLfloat
) rgba
[i
][ACOMP
] * scale
);
286 rgba
[i
][ACOMP
] = lut
[j
];
290 case GL_LUMINANCE_ALPHA
:
291 /* replace RGBA with LLLA */
292 if (table
->Size
== 256) {
293 for (i
= 0; i
< n
; i
++) {
294 GLubyte l
= lut
[rgba
[i
][RCOMP
] * 2 + 0];
295 GLubyte a
= lut
[rgba
[i
][ACOMP
] * 2 + 1];;
303 for (i
= 0; i
< n
; i
++) {
304 GLint jL
= IROUND((GLfloat
) rgba
[i
][RCOMP
] * scale
);
305 GLint jA
= IROUND((GLfloat
) rgba
[i
][ACOMP
] * scale
);
306 GLubyte luminance
= lut
[jL
* 2 + 0];
307 GLubyte alpha
= lut
[jA
* 2 + 1];
310 rgba
[i
][BCOMP
] = luminance
;
311 rgba
[i
][ACOMP
] = alpha
;
316 if (table
->Size
== 256) {
317 for (i
= 0; i
< n
; i
++) {
318 rgba
[i
][RCOMP
] = lut
[rgba
[i
][RCOMP
] * 3 + 0];
319 rgba
[i
][GCOMP
] = lut
[rgba
[i
][GCOMP
] * 3 + 1];
320 rgba
[i
][BCOMP
] = lut
[rgba
[i
][BCOMP
] * 3 + 2];
324 for (i
= 0; i
< n
; i
++) {
325 GLint jR
= IROUND((GLfloat
) rgba
[i
][RCOMP
] * scale
);
326 GLint jG
= IROUND((GLfloat
) rgba
[i
][GCOMP
] * scale
);
327 GLint jB
= IROUND((GLfloat
) rgba
[i
][BCOMP
] * scale
);
328 rgba
[i
][RCOMP
] = lut
[jR
* 3 + 0];
329 rgba
[i
][GCOMP
] = lut
[jG
* 3 + 1];
330 rgba
[i
][BCOMP
] = lut
[jB
* 3 + 2];
335 if (table
->Size
== 256) {
336 for (i
= 0; i
< n
; i
++) {
337 rgba
[i
][RCOMP
] = lut
[rgba
[i
][RCOMP
] * 4 + 0];
338 rgba
[i
][GCOMP
] = lut
[rgba
[i
][GCOMP
] * 4 + 1];
339 rgba
[i
][BCOMP
] = lut
[rgba
[i
][BCOMP
] * 4 + 2];
340 rgba
[i
][ACOMP
] = lut
[rgba
[i
][ACOMP
] * 4 + 3];
344 for (i
= 0; i
< n
; i
++) {
345 GLint jR
= IROUND((GLfloat
) rgba
[i
][RCOMP
] * scale
);
346 GLint jG
= IROUND((GLfloat
) rgba
[i
][GCOMP
] * scale
);
347 GLint jB
= IROUND((GLfloat
) rgba
[i
][BCOMP
] * scale
);
348 GLint jA
= IROUND((GLfloat
) rgba
[i
][ACOMP
] * scale
);
349 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][RCOMP
], lut
[jR
* 4 + 0]);
350 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][GCOMP
], lut
[jG
* 4 + 1]);
351 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][BCOMP
], lut
[jB
* 4 + 2]);
352 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][ACOMP
], lut
[jA
* 4 + 3]);
357 _mesa_problem(NULL
, "Bad format in _mesa_lookup_rgba_chan");
365 * Map color indexes to float rgba values.
368 _mesa_map_ci_to_rgba( const struct gl_context
*ctx
, GLuint n
,
369 const GLuint index
[], GLfloat rgba
[][4] )
371 GLuint rmask
= ctx
->PixelMaps
.ItoR
.Size
- 1;
372 GLuint gmask
= ctx
->PixelMaps
.ItoG
.Size
- 1;
373 GLuint bmask
= ctx
->PixelMaps
.ItoB
.Size
- 1;
374 GLuint amask
= ctx
->PixelMaps
.ItoA
.Size
- 1;
375 const GLfloat
*rMap
= ctx
->PixelMaps
.ItoR
.Map
;
376 const GLfloat
*gMap
= ctx
->PixelMaps
.ItoG
.Map
;
377 const GLfloat
*bMap
= ctx
->PixelMaps
.ItoB
.Map
;
378 const GLfloat
*aMap
= ctx
->PixelMaps
.ItoA
.Map
;
381 rgba
[i
][RCOMP
] = rMap
[index
[i
] & rmask
];
382 rgba
[i
][GCOMP
] = gMap
[index
[i
] & gmask
];
383 rgba
[i
][BCOMP
] = bMap
[index
[i
] & bmask
];
384 rgba
[i
][ACOMP
] = aMap
[index
[i
] & amask
];
390 * Map ubyte color indexes to ubyte/RGBA values.
393 _mesa_map_ci8_to_rgba8(const struct gl_context
*ctx
,
394 GLuint n
, const GLubyte index
[],
397 GLuint rmask
= ctx
->PixelMaps
.ItoR
.Size
- 1;
398 GLuint gmask
= ctx
->PixelMaps
.ItoG
.Size
- 1;
399 GLuint bmask
= ctx
->PixelMaps
.ItoB
.Size
- 1;
400 GLuint amask
= ctx
->PixelMaps
.ItoA
.Size
- 1;
401 const GLubyte
*rMap
= ctx
->PixelMaps
.ItoR
.Map8
;
402 const GLubyte
*gMap
= ctx
->PixelMaps
.ItoG
.Map8
;
403 const GLubyte
*bMap
= ctx
->PixelMaps
.ItoB
.Map8
;
404 const GLubyte
*aMap
= ctx
->PixelMaps
.ItoA
.Map8
;
407 rgba
[i
][RCOMP
] = rMap
[index
[i
] & rmask
];
408 rgba
[i
][GCOMP
] = gMap
[index
[i
] & gmask
];
409 rgba
[i
][BCOMP
] = bMap
[index
[i
] & bmask
];
410 rgba
[i
][ACOMP
] = aMap
[index
[i
] & amask
];
416 _mesa_scale_and_bias_depth(const struct gl_context
*ctx
, GLuint n
,
417 GLfloat depthValues
[])
419 const GLfloat scale
= ctx
->Pixel
.DepthScale
;
420 const GLfloat bias
= ctx
->Pixel
.DepthBias
;
422 for (i
= 0; i
< n
; i
++) {
423 GLfloat d
= depthValues
[i
] * scale
+ bias
;
424 depthValues
[i
] = CLAMP(d
, 0.0F
, 1.0F
);
430 _mesa_scale_and_bias_depth_uint(const struct gl_context
*ctx
, GLuint n
,
431 GLuint depthValues
[])
433 const GLdouble max
= (double) 0xffffffff;
434 const GLdouble scale
= ctx
->Pixel
.DepthScale
;
435 const GLdouble bias
= ctx
->Pixel
.DepthBias
* max
;
437 for (i
= 0; i
< n
; i
++) {
438 GLdouble d
= (GLdouble
) depthValues
[i
] * scale
+ bias
;
439 d
= CLAMP(d
, 0.0, max
);
440 depthValues
[i
] = (GLuint
) d
;
445 * Apply various pixel transfer operations to an array of RGBA pixels
446 * as indicated by the transferOps bitmask
449 _mesa_apply_rgba_transfer_ops(struct gl_context
*ctx
, GLbitfield transferOps
,
450 GLuint n
, GLfloat rgba
[][4])
453 if (transferOps
& IMAGE_SCALE_BIAS_BIT
) {
454 _mesa_scale_and_bias_rgba(n
, rgba
,
455 ctx
->Pixel
.RedScale
, ctx
->Pixel
.GreenScale
,
456 ctx
->Pixel
.BlueScale
, ctx
->Pixel
.AlphaScale
,
457 ctx
->Pixel
.RedBias
, ctx
->Pixel
.GreenBias
,
458 ctx
->Pixel
.BlueBias
, ctx
->Pixel
.AlphaBias
);
460 /* color map lookup */
461 if (transferOps
& IMAGE_MAP_COLOR_BIT
) {
462 _mesa_map_rgba( ctx
, n
, rgba
);
465 /* clamping to [0,1] */
466 if (transferOps
& IMAGE_CLAMP_BIT
) {
468 for (i
= 0; i
< n
; i
++) {
469 rgba
[i
][RCOMP
] = CLAMP(rgba
[i
][RCOMP
], 0.0F
, 1.0F
);
470 rgba
[i
][GCOMP
] = CLAMP(rgba
[i
][GCOMP
], 0.0F
, 1.0F
);
471 rgba
[i
][BCOMP
] = CLAMP(rgba
[i
][BCOMP
], 0.0F
, 1.0F
);
472 rgba
[i
][ACOMP
] = CLAMP(rgba
[i
][ACOMP
], 0.0F
, 1.0F
);
479 * Apply color index shift and offset to an array of pixels.
482 _mesa_shift_and_offset_ci(const struct gl_context
*ctx
,
483 GLuint n
, GLuint indexes
[])
485 GLint shift
= ctx
->Pixel
.IndexShift
;
486 GLint offset
= ctx
->Pixel
.IndexOffset
;
490 indexes
[i
] = (indexes
[i
] << shift
) + offset
;
493 else if (shift
< 0) {
496 indexes
[i
] = (indexes
[i
] >> shift
) + offset
;
501 indexes
[i
] = indexes
[i
] + offset
;
509 * Apply color index shift, offset and table lookup to an array
513 _mesa_apply_ci_transfer_ops(const struct gl_context
*ctx
,
514 GLbitfield transferOps
,
515 GLuint n
, GLuint indexes
[])
517 if (transferOps
& IMAGE_SHIFT_OFFSET_BIT
) {
518 _mesa_shift_and_offset_ci(ctx
, n
, indexes
);
520 if (transferOps
& IMAGE_MAP_COLOR_BIT
) {
521 const GLuint mask
= ctx
->PixelMaps
.ItoI
.Size
- 1;
523 for (i
= 0; i
< n
; i
++) {
524 const GLuint j
= indexes
[i
] & mask
;
525 indexes
[i
] = IROUND(ctx
->PixelMaps
.ItoI
.Map
[j
]);
532 * Apply stencil index shift, offset and table lookup to an array
536 _mesa_apply_stencil_transfer_ops(const struct gl_context
*ctx
, GLuint n
,
539 if (ctx
->Pixel
.IndexShift
!= 0 || ctx
->Pixel
.IndexOffset
!= 0) {
540 const GLint offset
= ctx
->Pixel
.IndexOffset
;
541 GLint shift
= ctx
->Pixel
.IndexShift
;
544 for (i
= 0; i
< n
; i
++) {
545 stencil
[i
] = (stencil
[i
] << shift
) + offset
;
548 else if (shift
< 0) {
550 for (i
= 0; i
< n
; i
++) {
551 stencil
[i
] = (stencil
[i
] >> shift
) + offset
;
555 for (i
= 0; i
< n
; i
++) {
556 stencil
[i
] = stencil
[i
] + offset
;
560 if (ctx
->Pixel
.MapStencilFlag
) {
561 GLuint mask
= ctx
->PixelMaps
.StoS
.Size
- 1;
563 for (i
= 0; i
< n
; i
++) {
564 stencil
[i
] = (GLstencil
)ctx
->PixelMaps
.StoS
.Map
[ stencil
[i
] & mask
];