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[reactos.git] / reactos / lib / mesa32 / src / swrast / s_accum.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.3
4 *
5 * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26 #include "glheader.h"
27 #include "context.h"
28 #include "macros.h"
29 #include "imports.h"
30 #include "fbobject.h"
31
32 #include "s_accum.h"
33 #include "s_context.h"
34 #include "s_masking.h"
35 #include "s_span.h"
36
37
38 #define ACCUM_SCALE16 32767.0
39
40
41 /*
42 * Accumulation buffer notes
43 *
44 * Normally, accumulation buffer values are GLshorts with values in
45 * [-32767, 32767] which represent floating point colors in [-1, 1],
46 * as defined by the OpenGL specification.
47 *
48 * We optimize for the common case used for full-scene antialiasing:
49 * // start with accum buffer cleared to zero
50 * glAccum(GL_LOAD, w); // or GL_ACCUM the first image
51 * glAccum(GL_ACCUM, w);
52 * ...
53 * glAccum(GL_ACCUM, w);
54 * glAccum(GL_RETURN, 1.0);
55 * That is, we start with an empty accumulation buffer and accumulate
56 * n images, each with weight w = 1/n.
57 * In this scenario, we can simply store unscaled integer values in
58 * the accum buffer instead of scaled integers. We'll also keep track
59 * of the w value so when we do GL_RETURN we simply divide the accumulated
60 * values by n (n=1/w).
61 * This lets us avoid _many_ int->float->int conversions.
62 */
63
64
65 #if CHAN_BITS == 8 && ACCUM_BITS <= 32
66 /* enable the optimization */
67 #define USE_OPTIMIZED_ACCUM 1
68 #else
69 #define USE_OPTIMIZED_ACCUM 0
70 #endif
71
72
73 /**
74 * This is called when we fall out of optimized/unscaled accum buffer mode.
75 * That is, we convert each unscaled accum buffer value into a scaled value
76 * representing the range[-1, 1].
77 */
78 static void
79 rescale_accum( GLcontext *ctx )
80 {
81 SWcontext *swrast = SWRAST_CONTEXT(ctx);
82 struct gl_renderbuffer *rb
83 = ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
84 const GLfloat s = swrast->_IntegerAccumScaler * (32767.0F / CHAN_MAXF);
85
86 assert(rb);
87 assert(rb->_BaseFormat == GL_RGBA);
88 /* add other types in future? */
89 assert(rb->DataType == GL_SHORT || rb->DataType == GL_UNSIGNED_SHORT);
90 assert(swrast->_IntegerAccumMode);
91
92 if (rb->GetPointer(ctx, rb, 0, 0)) {
93 /* directly-addressable memory */
94 GLuint y;
95 for (y = 0; y < rb->Height; y++) {
96 GLuint i;
97 GLshort *acc = (GLshort *) rb->GetPointer(ctx, rb, 0, y);
98 for (i = 0; i < 4 * rb->Width; i++) {
99 acc[i] = (GLshort) (acc[i] * s);
100 }
101 }
102 }
103 else {
104 /* use get/put row funcs */
105 GLuint y;
106 for (y = 0; y < rb->Height; y++) {
107 GLshort accRow[MAX_WIDTH * 4];
108 GLuint i;
109 rb->GetRow(ctx, rb, rb->Width, 0, y, accRow);
110 for (i = 0; i < 4 * rb->Width; i++) {
111 accRow[i] = (GLshort) (accRow[i] * s);
112 }
113 rb->PutRow(ctx, rb, rb->Width, 0, y, accRow, NULL);
114 }
115 }
116
117 swrast->_IntegerAccumMode = GL_FALSE;
118 }
119
120
121
122 /**
123 * Clear the accumulation Buffer.
124 */
125 void
126 _swrast_clear_accum_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
127 {
128 SWcontext *swrast = SWRAST_CONTEXT(ctx);
129 GLuint x, y, width, height;
130
131 if (ctx->Visual.accumRedBits == 0) {
132 /* No accumulation buffer! Not an error. */
133 return;
134 }
135
136 assert(rb);
137 assert(rb->_BaseFormat == GL_RGBA);
138 /* add other types in future? */
139 assert(rb->DataType == GL_SHORT || rb->DataType == GL_UNSIGNED_SHORT);
140
141 /* bounds, with scissor */
142 x = ctx->DrawBuffer->_Xmin;
143 y = ctx->DrawBuffer->_Ymin;
144 width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
145 height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
146
147 if (rb->DataType == GL_SHORT || rb->DataType == GL_UNSIGNED_SHORT) {
148 const GLfloat accScale = 32767.0;
149 GLshort clearVal[4];
150 GLuint i;
151
152 clearVal[0] = (GLshort) (ctx->Accum.ClearColor[0] * accScale);
153 clearVal[1] = (GLshort) (ctx->Accum.ClearColor[1] * accScale);
154 clearVal[2] = (GLshort) (ctx->Accum.ClearColor[2] * accScale);
155 clearVal[3] = (GLshort) (ctx->Accum.ClearColor[3] * accScale);
156
157 for (i = 0; i < height; i++) {
158 rb->PutMonoRow(ctx, rb, width, x, y + i, clearVal, NULL);
159 }
160 }
161 else {
162 /* someday support other sizes */
163 }
164
165 /* update optimized accum state vars */
166 if (ctx->Accum.ClearColor[0] == 0.0 && ctx->Accum.ClearColor[1] == 0.0 &&
167 ctx->Accum.ClearColor[2] == 0.0 && ctx->Accum.ClearColor[3] == 0.0) {
168 #if USE_OPTIMIZED_ACCUM
169 swrast->_IntegerAccumMode = GL_TRUE;
170 #else
171 swrast->_IntegerAccumMode = GL_FALSE;
172 #endif
173 swrast->_IntegerAccumScaler = 0.0; /* denotes empty accum buffer */
174 }
175 else {
176 swrast->_IntegerAccumMode = GL_FALSE;
177 }
178 }
179
180
181 static void
182 accum_add(GLcontext *ctx, GLfloat value,
183 GLint xpos, GLint ypos, GLint width, GLint height )
184 {
185 SWcontext *swrast = SWRAST_CONTEXT(ctx);
186 struct gl_renderbuffer *rb
187 = ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
188
189 assert(rb);
190
191 /* Leave optimized accum buffer mode */
192 if (swrast->_IntegerAccumMode)
193 rescale_accum(ctx);
194
195 if (rb->DataType == GL_SHORT || rb->DataType == GL_UNSIGNED_SHORT) {
196 const GLshort incr = (GLshort) (value * ACCUM_SCALE16);
197 if (rb->GetPointer(ctx, rb, 0, 0)) {
198 GLint i, j;
199 for (i = 0; i < height; i++) {
200 GLshort *acc = (GLshort *) rb->GetPointer(ctx, rb, xpos, ypos + i);
201 for (j = 0; j < 4 * width; j++) {
202 acc[j] += incr;
203 }
204 }
205 }
206 else {
207 GLint i, j;
208 for (i = 0; i < height; i++) {
209 GLshort accRow[4 * MAX_WIDTH];
210 rb->GetRow(ctx, rb, width, xpos, ypos + i, accRow);
211 for (j = 0; j < 4 * width; j++) {
212 accRow[j] += incr;
213 }
214 rb->PutRow(ctx, rb, width, xpos, ypos + i, accRow, NULL);
215 }
216 }
217 }
218 else {
219 /* other types someday */
220 }
221 }
222
223
224 static void
225 accum_mult(GLcontext *ctx, GLfloat mult,
226 GLint xpos, GLint ypos, GLint width, GLint height )
227 {
228 SWcontext *swrast = SWRAST_CONTEXT(ctx);
229 struct gl_renderbuffer *rb
230 = ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
231
232 assert(rb);
233
234 /* Leave optimized accum buffer mode */
235 if (swrast->_IntegerAccumMode)
236 rescale_accum(ctx);
237
238 if (rb->DataType == GL_SHORT || rb->DataType == GL_UNSIGNED_SHORT) {
239 if (rb->GetPointer(ctx, rb, 0, 0)) {
240 GLint i, j;
241 for (i = 0; i < height; i++) {
242 GLshort *acc = (GLshort *) rb->GetPointer(ctx, rb, xpos, ypos + i);
243 for (j = 0; j < 4 * width; j++) {
244 acc[j] = (GLshort) (acc[j] * mult);
245 }
246 }
247 }
248 else {
249 GLint i, j;
250 for (i = 0; i < height; i++) {
251 GLshort accRow[4 * MAX_WIDTH];
252 rb->GetRow(ctx, rb, width, xpos, ypos + i, accRow);
253 for (j = 0; j < 4 * width; j++) {
254 accRow[j] = (GLshort) (accRow[j] * mult);
255 }
256 rb->PutRow(ctx, rb, width, xpos, ypos + i, accRow, NULL);
257 }
258 }
259 }
260 else {
261 /* other types someday */
262 }
263 }
264
265
266
267 static void
268 accum_accum(GLcontext *ctx, GLfloat value,
269 GLint xpos, GLint ypos, GLint width, GLint height )
270 {
271 SWcontext *swrast = SWRAST_CONTEXT(ctx);
272 struct gl_renderbuffer *rb
273 = ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
274 const GLboolean directAccess = (rb->GetPointer(ctx, rb, 0, 0) != NULL);
275
276 assert(rb);
277
278 if (!ctx->ReadBuffer->_ColorReadBuffer) {
279 /* no read buffer - OK */
280 return;
281 }
282
283 /* May have to leave optimized accum buffer mode */
284 if (swrast->_IntegerAccumScaler == 0.0 && value > 0.0 && value <= 1.0)
285 swrast->_IntegerAccumScaler = value;
286 if (swrast->_IntegerAccumMode && value != swrast->_IntegerAccumScaler)
287 rescale_accum(ctx);
288
289 _swrast_use_read_buffer(ctx);
290
291 if (rb->DataType == GL_SHORT || rb->DataType == GL_UNSIGNED_SHORT) {
292 const GLfloat scale = value * ACCUM_SCALE16 / CHAN_MAXF;
293 GLshort accumRow[4 * MAX_WIDTH];
294 GLchan rgba[MAX_WIDTH][4];
295 GLint i;
296
297 for (i = 0; i < height; i++) {
298 GLshort *acc;
299 if (directAccess) {
300 acc = (GLshort *) rb->GetPointer(ctx, rb, xpos, ypos + i);
301 }
302 else {
303 rb->GetRow(ctx, rb, width, xpos, ypos + i, accumRow);
304 acc = accumRow;
305 }
306
307 /* read colors from color buffer */
308 _swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer, width,
309 xpos, ypos + i, rgba);
310
311 /* do accumulation */
312 if (swrast->_IntegerAccumMode) {
313 /* simply add integer color values into accum buffer */
314 GLint j;
315 for (j = 0; j < width; j++) {
316 acc[j * 4 + 0] += rgba[j][RCOMP];
317 acc[j * 4 + 1] += rgba[j][GCOMP];
318 acc[j * 4 + 2] += rgba[j][BCOMP];
319 acc[j * 4 + 3] += rgba[j][ACOMP];
320 }
321 }
322 else {
323 /* scaled integer (or float) accum buffer */
324 GLint j;
325 for (j = 0; j < width; j++) {
326 acc[j * 4 + 0] += (GLshort) ((GLfloat) rgba[j][RCOMP] * scale);
327 acc[j * 4 + 1] += (GLshort) ((GLfloat) rgba[j][GCOMP] * scale);
328 acc[j * 4 + 2] += (GLshort) ((GLfloat) rgba[j][BCOMP] * scale);
329 acc[j * 4 + 3] += (GLshort) ((GLfloat) rgba[j][ACOMP] * scale);
330 }
331 }
332
333 if (!directAccess) {
334 rb->PutRow(ctx, rb, width, xpos, ypos + i, accumRow, NULL);
335 }
336 }
337 }
338 else {
339 /* other types someday */
340 }
341
342 _swrast_use_draw_buffer(ctx);
343 }
344
345
346
347 static void
348 accum_load(GLcontext *ctx, GLfloat value,
349 GLint xpos, GLint ypos, GLint width, GLint height )
350 {
351 SWcontext *swrast = SWRAST_CONTEXT(ctx);
352 struct gl_renderbuffer *rb
353 = ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
354 const GLboolean directAccess = (rb->GetPointer(ctx, rb, 0, 0) != NULL);
355
356 assert(rb);
357
358 if (!ctx->ReadBuffer->_ColorReadBuffer) {
359 /* no read buffer - OK */
360 return;
361 }
362
363 /* This is a change to go into optimized accum buffer mode */
364 if (value > 0.0 && value <= 1.0) {
365 #if USE_OPTIMIZED_ACCUM
366 swrast->_IntegerAccumMode = GL_TRUE;
367 #else
368 swrast->_IntegerAccumMode = GL_FALSE;
369 #endif
370 swrast->_IntegerAccumScaler = value;
371 }
372 else {
373 swrast->_IntegerAccumMode = GL_FALSE;
374 swrast->_IntegerAccumScaler = 0.0;
375 }
376
377 _swrast_use_read_buffer(ctx);
378
379 if (rb->DataType == GL_SHORT || rb->DataType == GL_UNSIGNED_SHORT) {
380 const GLfloat scale = value * ACCUM_SCALE16 / CHAN_MAXF;
381 GLshort accumRow[4 * MAX_WIDTH];
382 GLchan rgba[MAX_WIDTH][4];
383 GLint i;
384
385 for (i = 0; i < height; i++) {
386 GLshort *acc;
387 if (directAccess) {
388 acc = (GLshort *) rb->GetPointer(ctx, rb, xpos, ypos + i);
389 }
390 else {
391 rb->GetRow(ctx, rb, width, xpos, ypos + i, accumRow);
392 acc = accumRow;
393 }
394
395 /* read colors from color buffer */
396 _swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer, width,
397 xpos, ypos + i, rgba);
398
399 /* do load */
400 if (swrast->_IntegerAccumMode) {
401 /* just copy values in */
402 GLint j;
403 assert(swrast->_IntegerAccumScaler > 0.0);
404 assert(swrast->_IntegerAccumScaler <= 1.0);
405 for (j = 0; j < width; j++) {
406 acc[j * 4 + 0] = rgba[j][RCOMP];
407 acc[j * 4 + 1] = rgba[j][GCOMP];
408 acc[j * 4 + 2] = rgba[j][BCOMP];
409 acc[j * 4 + 3] = rgba[j][ACOMP];
410 }
411 }
412 else {
413 /* scaled integer (or float) accum buffer */
414 GLint j;
415 for (j = 0; j < width; j++) {
416 acc[j * 4 + 0] = (GLshort) ((GLfloat) rgba[j][RCOMP] * scale);
417 acc[j * 4 + 1] = (GLshort) ((GLfloat) rgba[j][GCOMP] * scale);
418 acc[j * 4 + 2] = (GLshort) ((GLfloat) rgba[j][BCOMP] * scale);
419 acc[j * 4 + 3] = (GLshort) ((GLfloat) rgba[j][ACOMP] * scale);
420 }
421 }
422
423 if (!directAccess) {
424 rb->PutRow(ctx, rb, width, xpos, ypos + i, accumRow, NULL);
425 }
426 }
427 }
428 else {
429 /* other types someday */
430 }
431
432 _swrast_use_draw_buffer(ctx);
433 }
434
435
436 static void
437 accum_return(GLcontext *ctx, GLfloat value,
438 GLint xpos, GLint ypos, GLint width, GLint height )
439 {
440 SWcontext *swrast = SWRAST_CONTEXT(ctx);
441 struct gl_framebuffer *fb = ctx->DrawBuffer;
442 struct gl_renderbuffer *accumRb = fb->Attachment[BUFFER_ACCUM].Renderbuffer;
443 const GLboolean directAccess
444 = (accumRb->GetPointer(ctx, accumRb, 0, 0) != NULL);
445 const GLboolean masking = (!ctx->Color.ColorMask[RCOMP] ||
446 !ctx->Color.ColorMask[GCOMP] ||
447 !ctx->Color.ColorMask[BCOMP] ||
448 !ctx->Color.ColorMask[ACOMP]);
449
450 static GLchan multTable[32768];
451 static GLfloat prevMult = 0.0;
452 const GLfloat mult = swrast->_IntegerAccumScaler;
453 const GLint max = MIN2((GLint) (256 / mult), 32767);
454
455 /* May have to leave optimized accum buffer mode */
456 if (swrast->_IntegerAccumMode && value != 1.0)
457 rescale_accum(ctx);
458
459 if (swrast->_IntegerAccumMode && swrast->_IntegerAccumScaler > 0) {
460 /* build lookup table to avoid many floating point multiplies */
461 GLint j;
462 assert(swrast->_IntegerAccumScaler <= 1.0);
463 if (mult != prevMult) {
464 for (j = 0; j < max; j++)
465 multTable[j] = IROUND((GLfloat) j * mult);
466 prevMult = mult;
467 }
468 }
469
470 if (accumRb->DataType == GL_SHORT ||
471 accumRb->DataType == GL_UNSIGNED_SHORT) {
472 const GLfloat scale = value * CHAN_MAXF / ACCUM_SCALE16;
473 GLuint buffer, i;
474
475 /* XXX maybe transpose the 'i' and 'buffer' loops??? */
476 for (i = 0; i < height; i++) {
477 GLchan rgba[MAX_WIDTH][4];
478 GLshort accumRow[4 * MAX_WIDTH];
479 GLshort *acc;
480
481 if (directAccess) {
482 acc = (GLshort *) accumRb->GetPointer(ctx, accumRb, xpos, ypos +i);
483 }
484 else {
485 accumRb->GetRow(ctx, accumRb, width, xpos, ypos + i, accumRow);
486 acc = accumRow;
487 }
488
489 /* get the colors to return */
490 if (swrast->_IntegerAccumMode) {
491 GLint j;
492 for (j = 0; j < width; j++) {
493 ASSERT(acc[j * 4 + 0] < max);
494 ASSERT(acc[j * 4 + 1] < max);
495 ASSERT(acc[j * 4 + 2] < max);
496 ASSERT(acc[j * 4 + 3] < max);
497 rgba[j][RCOMP] = multTable[acc[j * 4 + 0]];
498 rgba[j][GCOMP] = multTable[acc[j * 4 + 1]];
499 rgba[j][BCOMP] = multTable[acc[j * 4 + 2]];
500 rgba[j][ACOMP] = multTable[acc[j * 4 + 3]];
501 }
502 }
503 else {
504 /* scaled integer (or float) accum buffer */
505 GLint j;
506 for (j = 0; j < width; j++) {
507 GLint r = IROUND( (GLfloat) (acc[j * 4 + 0]) * scale );
508 GLint g = IROUND( (GLfloat) (acc[j * 4 + 1]) * scale );
509 GLint b = IROUND( (GLfloat) (acc[j * 4 + 2]) * scale );
510 GLint a = IROUND( (GLfloat) (acc[j * 4 + 3]) * scale );
511 rgba[j][RCOMP] = CLAMP( r, 0, CHAN_MAX );
512 rgba[j][GCOMP] = CLAMP( g, 0, CHAN_MAX );
513 rgba[j][BCOMP] = CLAMP( b, 0, CHAN_MAX );
514 rgba[j][ACOMP] = CLAMP( a, 0, CHAN_MAX );
515 }
516 }
517
518 /* store colors */
519 for (buffer = 0; buffer < fb->_NumColorDrawBuffers[0]; buffer++) {
520 struct gl_renderbuffer *rb = fb->_ColorDrawBuffers[0][buffer];
521 if (masking) {
522 _swrast_mask_rgba_array(ctx, rb, width, xpos, ypos + i, rgba);
523 }
524 rb->PutRow(ctx, rb, width, xpos, ypos + i, rgba, NULL);
525 }
526 }
527 }
528 else {
529 /* other types someday */
530 }
531 }
532
533
534
535 /**
536 * Software fallback for glAccum.
537 */
538 void
539 _swrast_Accum( GLcontext *ctx, GLenum op, GLfloat value,
540 GLint xpos, GLint ypos,
541 GLint width, GLint height )
542
543 {
544 SWcontext *swrast = SWRAST_CONTEXT(ctx);
545
546 if (SWRAST_CONTEXT(ctx)->NewState)
547 _swrast_validate_derived( ctx );
548
549 if (!ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer) {
550 _mesa_warning(ctx, "Calling glAccum() without an accumulation buffer");
551 return;
552 }
553
554 RENDER_START(swrast, ctx);
555
556 switch (op) {
557 case GL_ADD:
558 if (value != 0.0F) {
559 accum_add(ctx, value, xpos, ypos, width, height);
560 }
561 break;
562 case GL_MULT:
563 if (value != 1.0F) {
564 accum_mult(ctx, value, xpos, ypos, width, height);
565 }
566 break;
567 case GL_ACCUM:
568 if (value != 0.0F) {
569 accum_accum(ctx, value, xpos, ypos, width, height);
570 }
571 break;
572 case GL_LOAD:
573 accum_load(ctx, value, xpos, ypos, width, height);
574 break;
575 case GL_RETURN:
576 accum_return(ctx, value, xpos, ypos, width, height);
577 break;
578 default:
579 _mesa_problem(ctx, "invalid mode in _swrast_Accum()");
580 break;
581 }
582
583 RENDER_FINISH(swrast, ctx);
584 }
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