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[mesa.git] / src / mesa / swrast / s_nvfragprog.c
1 /* $Id: s_nvfragprog.c,v 1.11 2003/03/19 07:15:35 joukj Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 5.1
6 *
7 * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27
28
29 #include "glheader.h"
30 #include "colormac.h"
31 #include "context.h"
32 #include "nvfragprog.h"
33 #include "macros.h"
34
35 #include "s_nvfragprog.h"
36 #include "s_span.h"
37 #include "s_texture.h"
38
39
40 /**
41 * Fetch a texel.
42 */
43 static void
44 fetch_texel( GLcontext *ctx, const GLfloat texcoord[4], GLuint unit,
45 GLfloat color[4] )
46 {
47 const GLfloat *lambda = NULL;
48 GLchan rgba[4];
49 SWcontext *swrast = SWRAST_CONTEXT(ctx);
50
51 swrast->TextureSample[unit](ctx, unit, ctx->Texture.Unit[unit]._Current,
52 1, (const GLfloat (*)[4]) texcoord,
53 lambda, &rgba);
54 color[0] = CHAN_TO_FLOAT(rgba[0]);
55 color[1] = CHAN_TO_FLOAT(rgba[1]);
56 color[2] = CHAN_TO_FLOAT(rgba[2]);
57 color[3] = CHAN_TO_FLOAT(rgba[3]);
58 }
59
60
61 /**
62 * Fetch a texel with the given partial derivatives to compute a level
63 * of detail in the mipmap.
64 */
65 static void
66 fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
67 const GLfloat texdx[4], const GLfloat texdy[4],
68 GLuint unit, GLfloat color[4] )
69 {
70 SWcontext *swrast = SWRAST_CONTEXT(ctx);
71 const struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
72 const struct gl_texture_image *texImg = texObj->Image[texObj->BaseLevel];
73 const GLfloat texW = (GLfloat) texImg->WidthScale;
74 const GLfloat texH = (GLfloat) texImg->HeightScale;
75 GLchan rgba[4];
76
77 GLfloat lambda = _mesa_compute_lambda(texdx[0], texdy[0], /* ds/dx, ds/dy */
78 texdx[1], texdy[1], /* dt/dx, dt/dy */
79 texdx[3], texdy[2], /* dq/dx, dq/dy */
80 texW, texH,
81 texcoord[0], texcoord[1], texcoord[3],
82 1.0F / texcoord[3]);
83
84 swrast->TextureSample[unit](ctx, unit, ctx->Texture.Unit[unit]._Current,
85 1, (const GLfloat (*)[4]) texcoord,
86 &lambda, &rgba);
87 color[0] = CHAN_TO_FLOAT(rgba[0]);
88 color[1] = CHAN_TO_FLOAT(rgba[1]);
89 color[2] = CHAN_TO_FLOAT(rgba[2]);
90 color[3] = CHAN_TO_FLOAT(rgba[3]);
91 }
92
93
94
95 /**
96 * Fetch a 4-element float vector from the given source register.
97 * Apply swizzling and negating as needed.
98 */
99 static void
100 fetch_vector4( const struct fp_src_register *source,
101 const struct fp_machine *machine,
102 GLfloat result[4] )
103 {
104 const GLfloat *src = machine->Registers[source->Register];
105
106 result[0] = src[source->Swizzle[0]];
107 result[1] = src[source->Swizzle[1]];
108 result[2] = src[source->Swizzle[2]];
109 result[3] = src[source->Swizzle[3]];
110
111 if (source->NegateBase) {
112 result[0] = -result[0];
113 result[1] = -result[1];
114 result[2] = -result[2];
115 result[3] = -result[3];
116 }
117 if (source->Abs) {
118 result[0] = FABSF(result[0]);
119 result[1] = FABSF(result[1]);
120 result[2] = FABSF(result[2]);
121 result[3] = FABSF(result[3]);
122 }
123 if (source->NegateAbs) {
124 result[0] = -result[0];
125 result[1] = -result[1];
126 result[2] = -result[2];
127 result[3] = -result[3];
128 }
129 }
130
131
132 /**
133 * Fetch the derivative with respect to X for the given register.
134 * \return GL_TRUE if it was easily computed or GL_FALSE if we
135 * need to execute another instance of the program (ugh)!
136 */
137 static GLboolean
138 fetch_vector4_deriv( const struct fp_src_register *source,
139 const struct sw_span *span,
140 char xOrY, GLfloat result[4] )
141 {
142 GLfloat src[4];
143
144 ASSERT(xOrY == 'X' || xOrY == 'Y');
145
146 switch (source->Register) {
147 case FRAG_ATTRIB_WPOS:
148 if (xOrY == 'X') {
149 src[0] = 1.0;
150 src[1] = 0.0;
151 src[2] = span->dzdx;
152 src[3] = span->dwdx;
153 }
154 else {
155 src[0] = 0.0;
156 src[1] = 1.0;
157 src[2] = span->dzdy;
158 src[3] = span->dwdy;
159 }
160 break;
161 case FRAG_ATTRIB_COL0:
162 if (xOrY == 'X') {
163 src[0] = span->drdx * (1.0F / CHAN_MAXF);
164 src[1] = span->dgdx * (1.0F / CHAN_MAXF);
165 src[2] = span->dbdx * (1.0F / CHAN_MAXF);
166 src[3] = span->dadx * (1.0F / CHAN_MAXF);
167 }
168 else {
169 src[0] = span->drdy * (1.0F / CHAN_MAXF);
170 src[1] = span->dgdy * (1.0F / CHAN_MAXF);
171 src[2] = span->dbdy * (1.0F / CHAN_MAXF);
172 src[3] = span->dady * (1.0F / CHAN_MAXF);
173 }
174 break;
175 case FRAG_ATTRIB_COL1:
176 if (xOrY == 'X') {
177 src[0] = span->dsrdx * (1.0F / CHAN_MAXF);
178 src[1] = span->dsgdx * (1.0F / CHAN_MAXF);
179 src[2] = span->dsbdx * (1.0F / CHAN_MAXF);
180 src[3] = 0.0; /* XXX need this */
181 }
182 else {
183 src[0] = span->dsrdy * (1.0F / CHAN_MAXF);
184 src[1] = span->dsgdy * (1.0F / CHAN_MAXF);
185 src[2] = span->dsbdy * (1.0F / CHAN_MAXF);
186 src[3] = 0.0; /* XXX need this */
187 }
188 break;
189 case FRAG_ATTRIB_FOGC:
190 if (xOrY == 'X') {
191 src[0] = span->dfogdx;
192 src[1] = 0.0;
193 src[2] = 0.0;
194 src[3] = 0.0;
195 }
196 else {
197 src[0] = span->dfogdy;
198 src[1] = 0.0;
199 src[2] = 0.0;
200 src[3] = 0.0;
201 }
202 break;
203 case FRAG_ATTRIB_TEX0:
204 case FRAG_ATTRIB_TEX1:
205 case FRAG_ATTRIB_TEX2:
206 case FRAG_ATTRIB_TEX3:
207 case FRAG_ATTRIB_TEX4:
208 case FRAG_ATTRIB_TEX5:
209 case FRAG_ATTRIB_TEX6:
210 case FRAG_ATTRIB_TEX7:
211 if (xOrY == 'X') {
212 const GLuint u = source->Register - FRAG_ATTRIB_TEX0;
213 src[0] = span->texStepX[u][0] * (1.0F / CHAN_MAXF);
214 src[1] = span->texStepX[u][1] * (1.0F / CHAN_MAXF);
215 src[2] = span->texStepX[u][2] * (1.0F / CHAN_MAXF);
216 src[3] = span->texStepX[u][3] * (1.0F / CHAN_MAXF);
217 }
218 else {
219 const GLuint u = source->Register - FRAG_ATTRIB_TEX0;
220 src[0] = span->texStepY[u][0] * (1.0F / CHAN_MAXF);
221 src[1] = span->texStepY[u][1] * (1.0F / CHAN_MAXF);
222 src[2] = span->texStepY[u][2] * (1.0F / CHAN_MAXF);
223 src[3] = span->texStepY[u][3] * (1.0F / CHAN_MAXF);
224 }
225 break;
226 default:
227 return GL_FALSE;
228 }
229
230 result[0] = src[source->Swizzle[0]];
231 result[1] = src[source->Swizzle[1]];
232 result[2] = src[source->Swizzle[2]];
233 result[3] = src[source->Swizzle[3]];
234
235 if (source->NegateBase) {
236 result[0] = -result[0];
237 result[1] = -result[1];
238 result[2] = -result[2];
239 result[3] = -result[3];
240 }
241 if (source->Abs) {
242 result[0] = FABSF(result[0]);
243 result[1] = FABSF(result[1]);
244 result[2] = FABSF(result[2]);
245 result[3] = FABSF(result[3]);
246 }
247 if (source->NegateAbs) {
248 result[0] = -result[0];
249 result[1] = -result[1];
250 result[2] = -result[2];
251 result[3] = -result[3];
252 }
253 return GL_TRUE;
254 }
255
256
257 /**
258 * As above, but only return result[0] element.
259 */
260 static void
261 fetch_vector1( const struct fp_src_register *source,
262 const struct fp_machine *machine,
263 GLfloat result[4] )
264 {
265 const GLfloat *src = machine->Registers[source->Register];
266
267 result[0] = src[source->Swizzle[0]];
268
269 if (source->NegateBase) {
270 result[0] = -result[0];
271 }
272 if (source->Abs) {
273 result[0] = FABSF(result[0]);
274 }
275 if (source->NegateAbs) {
276 result[0] = -result[0];
277 }
278 }
279
280
281 /*
282 * Test value against zero and return GT, LT, EQ or UN if NaN.
283 */
284 static INLINE GLuint
285 generate_cc( float value )
286 {
287 if (value != value)
288 return COND_UN; /* NaN */
289 if (value > 0.0F)
290 return COND_GT;
291 if (value < 0.0F)
292 return COND_LT;
293 return COND_EQ;
294 }
295
296 /*
297 * Test if the ccMaskRule is satisfied by the given condition code.
298 * Used to mask destination writes according to the current condition codee.
299 */
300 static INLINE GLboolean
301 test_cc(GLuint condCode, GLuint ccMaskRule)
302 {
303 switch (ccMaskRule) {
304 case COND_EQ: return (condCode == COND_EQ);
305 case COND_NE: return (condCode != COND_EQ);
306 case COND_LT: return (condCode == COND_LT);
307 case COND_GE: return (condCode == COND_GT || condCode == COND_EQ);
308 case COND_LE: return (condCode == COND_LT || condCode == COND_EQ);
309 case COND_GT: return (condCode == COND_GT);
310 case COND_TR: return GL_TRUE;
311 case COND_FL: return GL_FALSE;
312 default: return GL_TRUE;
313 }
314 }
315
316
317 /**
318 * Store 4 floats into a register. Observe the instructions saturate and
319 * set-condition-code flags.
320 */
321 static void
322 store_vector4( const struct fp_instruction *inst,
323 struct fp_machine *machine,
324 const GLfloat value[4] )
325 {
326 const struct fp_dst_register *dest = &(inst->DstReg);
327 const GLboolean clamp = inst->Saturate;
328 const GLboolean updateCC = inst->UpdateCondRegister;
329 GLfloat *dstReg = machine->Registers[dest->Register];
330 GLfloat clampedValue[4];
331 const GLboolean *writeMask = dest->WriteMask;
332 GLboolean condWriteMask[4];
333
334 if (clamp) {
335 clampedValue[0] = CLAMP(value[0], 0.0F, 1.0F);
336 clampedValue[1] = CLAMP(value[1], 0.0F, 1.0F);
337 clampedValue[2] = CLAMP(value[2], 0.0F, 1.0F);
338 clampedValue[3] = CLAMP(value[3], 0.0F, 1.0F);
339 value = clampedValue;
340 }
341
342 if (dest->CondMask != COND_TR) {
343 condWriteMask[0] = writeMask[0]
344 && test_cc(machine->CondCodes[dest->CondSwizzle[0]], dest->CondMask);
345 condWriteMask[1] = writeMask[1]
346 && test_cc(machine->CondCodes[dest->CondSwizzle[1]], dest->CondMask);
347 condWriteMask[2] = writeMask[2]
348 && test_cc(machine->CondCodes[dest->CondSwizzle[2]], dest->CondMask);
349 condWriteMask[3] = writeMask[3]
350 && test_cc(machine->CondCodes[dest->CondSwizzle[3]], dest->CondMask);
351 writeMask = condWriteMask;
352 }
353
354 if (writeMask[0]) {
355 dstReg[0] = value[0];
356 if (updateCC)
357 machine->CondCodes[0] = generate_cc(value[0]);
358 }
359 if (writeMask[1]) {
360 dstReg[1] = value[1];
361 if (updateCC)
362 machine->CondCodes[1] = generate_cc(value[1]);
363 }
364 if (writeMask[2]) {
365 dstReg[2] = value[2];
366 if (updateCC)
367 machine->CondCodes[2] = generate_cc(value[2]);
368 }
369 if (writeMask[3]) {
370 dstReg[3] = value[3];
371 if (updateCC)
372 machine->CondCodes[3] = generate_cc(value[3]);
373 }
374 }
375
376
377 /**
378 * Initialize a new machine state instance from an existing one, adding
379 * the partial derivatives onto the input registers.
380 * Used to implement DDX and DDY instructions in non-trivial cases.
381 */
382 static void
383 init_machine_deriv( GLcontext *ctx,
384 const struct fp_machine *machine,
385 const struct fragment_program *program,
386 const struct sw_span *span, char xOrY,
387 struct fp_machine *dMachine )
388 {
389 GLuint u;
390
391 ASSERT(xOrY == 'X' || xOrY == 'Y');
392
393 /* copy existing machine */
394 _mesa_memcpy(dMachine, machine, sizeof(struct fp_machine));
395
396 /* Clear temporary registers */
397 _mesa_bzero((GLfloat*) (machine->Registers + FP_TEMP_REG_START) ,
398 MAX_NV_FRAGMENT_PROGRAM_TEMPS * 4 * sizeof(GLfloat));
399
400 /* Add derivatives */
401 if (program->InputsRead & (1 << FRAG_ATTRIB_WPOS)) {
402 GLfloat *wpos = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_WPOS];
403 if (xOrY == 'X') {
404 wpos[0] += 1.0F;
405 wpos[1] += 0.0F;
406 wpos[2] += span->dzdx;
407 wpos[3] += span->dwdx;
408 }
409 else {
410 wpos[0] += 0.0F;
411 wpos[1] += 1.0F;
412 wpos[2] += span->dzdy;
413 wpos[3] += span->dwdy;
414 }
415 }
416 if (program->InputsRead & (1 << FRAG_ATTRIB_COL0)) {
417 GLfloat *col0 = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_COL0];
418 if (xOrY == 'X') {
419 col0[0] += span->drdx * (1.0F / CHAN_MAXF);
420 col0[1] += span->dgdx * (1.0F / CHAN_MAXF);
421 col0[2] += span->dbdx * (1.0F / CHAN_MAXF);
422 col0[3] += span->dadx * (1.0F / CHAN_MAXF);
423 }
424 else {
425 col0[0] += span->drdy * (1.0F / CHAN_MAXF);
426 col0[1] += span->dgdy * (1.0F / CHAN_MAXF);
427 col0[2] += span->dbdy * (1.0F / CHAN_MAXF);
428 col0[3] += span->dady * (1.0F / CHAN_MAXF);
429 }
430 }
431 if (program->InputsRead & (1 << FRAG_ATTRIB_COL1)) {
432 GLfloat *col1 = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_COL1];
433 if (xOrY == 'X') {
434 col1[0] += span->dsrdx * (1.0F / CHAN_MAXF);
435 col1[1] += span->dsgdx * (1.0F / CHAN_MAXF);
436 col1[2] += span->dsbdx * (1.0F / CHAN_MAXF);
437 col1[3] += 0.0; /*XXX fix */
438 }
439 else {
440 col1[0] += span->dsrdy * (1.0F / CHAN_MAXF);
441 col1[1] += span->dsgdy * (1.0F / CHAN_MAXF);
442 col1[2] += span->dsbdy * (1.0F / CHAN_MAXF);
443 col1[3] += 0.0; /*XXX fix */
444 }
445 }
446 if (program->InputsRead & (1 << FRAG_ATTRIB_FOGC)) {
447 GLfloat *fogc = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_FOGC];
448 if (xOrY == 'X') {
449 fogc[0] += span->dfogdx;
450 }
451 else {
452 fogc[0] += span->dfogdy;
453 }
454 }
455 for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
456 if (program->InputsRead & (1 << (FRAG_ATTRIB_TEX0 + u))) {
457 GLfloat *tex = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_TEX0+u];
458 if (xOrY == 'X') {
459 tex[0] += span->texStepX[u][0];
460 tex[1] += span->texStepX[u][1];
461 tex[2] += span->texStepX[u][2];
462 tex[3] += span->texStepX[u][3];
463 }
464 else {
465 tex[0] += span->texStepY[u][0];
466 tex[1] += span->texStepY[u][1];
467 tex[2] += span->texStepY[u][2];
468 tex[3] += span->texStepY[u][3];
469 }
470 }
471 }
472 }
473
474
475 /**
476 * Execute the given vertex program.
477 * NOTE: we do everything in single-precision floating point; we don't
478 * currently observe the single/half/fixed-precision qualifiers.
479 * \param ctx - rendering context
480 * \param program - the fragment program to execute
481 * \param machine - machine state (register file)
482 * \param maxInst - max number of instructions to execute
483 * \return GL_TRUE if program completed or GL_FALSE if program executed KIL.
484 */
485 static GLboolean
486 execute_program( GLcontext *ctx,
487 const struct fragment_program *program, GLuint maxInst,
488 struct fp_machine *machine, const struct sw_span *span )
489 {
490 GLuint pc = 0;
491
492 for (pc = 0; pc < maxInst; pc++) {
493 const struct fp_instruction *inst = program->Instructions + pc;
494 switch (inst->Opcode) {
495 case FP_OPCODE_ADD:
496 {
497 GLfloat a[4], b[4], result[4];
498 fetch_vector4( &inst->SrcReg[0], machine, a );
499 fetch_vector4( &inst->SrcReg[1], machine, b );
500 result[0] = a[0] + b[0];
501 result[1] = a[1] + b[1];
502 result[2] = a[2] + b[2];
503 result[3] = a[3] + b[3];
504 store_vector4( inst, machine, result );
505 }
506 break;
507 case FP_OPCODE_COS:
508 {
509 GLfloat a[4], result[4];
510 fetch_vector1( &inst->SrcReg[0], machine, a );
511 result[0] = result[1] = result[2] = result[3] = _mesa_cos(a[0]);
512 store_vector4( inst, machine, result );
513 }
514 break;
515 case FP_OPCODE_DDX: /* Partial derivative with respect to X */
516 {
517 GLfloat a[4], aNext[4], result[4];
518 struct fp_machine dMachine;
519 if (!fetch_vector4_deriv(&inst->SrcReg[0], span, 'X', result)) {
520 /* This is tricky. Make a copy of the current machine state,
521 * increment the input registers by the dx or dy partial
522 * derivatives, then re-execute the program up to the
523 * preceeding instruction, then fetch the source register.
524 * Finally, find the difference in the register values for
525 * the original and derivative runs.
526 */
527 init_machine_deriv(ctx, machine, program, span,
528 'X', &dMachine);
529 execute_program(ctx, program, pc, &dMachine, span);
530 fetch_vector4( &inst->SrcReg[0], &dMachine, aNext );
531 result[0] = aNext[0] - a[0];
532 result[1] = aNext[1] - a[1];
533 result[2] = aNext[2] - a[2];
534 result[3] = aNext[3] - a[3];
535 }
536 store_vector4( inst, machine, result );
537 }
538 break;
539 case FP_OPCODE_DDY: /* Partial derivative with respect to Y */
540 {
541 GLfloat a[4], aNext[4], result[4];
542 struct fp_machine dMachine;
543 if (!fetch_vector4_deriv(&inst->SrcReg[0], span, 'Y', result)) {
544 init_machine_deriv(ctx, machine, program, span,
545 'Y', &dMachine);
546 execute_program(ctx, program, pc, &dMachine, span);
547 fetch_vector4( &inst->SrcReg[0], &dMachine, aNext );
548 result[0] = aNext[0] - a[0];
549 result[1] = aNext[1] - a[1];
550 result[2] = aNext[2] - a[2];
551 result[3] = aNext[3] - a[3];
552 }
553 store_vector4( inst, machine, result );
554 }
555 break;
556 case FP_OPCODE_DP3:
557 {
558 GLfloat a[4], b[4], result[4];
559 fetch_vector4( &inst->SrcReg[0], machine, a );
560 fetch_vector4( &inst->SrcReg[1], machine, b );
561 result[0] = result[1] = result[2] = result[3] =
562 a[0] + b[0] + a[1] * b[1] + a[2] * b[2];
563 store_vector4( inst, machine, result );
564 }
565 break;
566 case FP_OPCODE_DP4:
567 {
568 GLfloat a[4], b[4], result[4];
569 fetch_vector4( &inst->SrcReg[0], machine, a );
570 fetch_vector4( &inst->SrcReg[1], machine, b );
571 result[0] = result[1] = result[2] = result[3] =
572 a[0] + b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
573 store_vector4( inst, machine, result );
574 }
575 break;
576 case FP_OPCODE_DST: /* Distance vector */
577 {
578 GLfloat a[4], b[4], result[4];
579 fetch_vector4( &inst->SrcReg[0], machine, a );
580 fetch_vector4( &inst->SrcReg[1], machine, b );
581 result[0] = 1.0F;
582 result[1] = a[1] * b[1];
583 result[2] = a[2];
584 result[3] = b[3];
585 store_vector4( inst, machine, result );
586 }
587 break;
588 case FP_OPCODE_EX2: /* Exponential base 2 */
589 {
590 GLfloat a[4], result[4];
591 fetch_vector1( &inst->SrcReg[0], machine, a );
592 result[0] = result[1] = result[2] = result[3] =
593 (GLfloat) _mesa_pow(2.0, a[0]);
594 store_vector4( inst, machine, result );
595 }
596 break;
597 case FP_OPCODE_FLR:
598 {
599 GLfloat a[4], result[4];
600 fetch_vector4( &inst->SrcReg[0], machine, a );
601 result[0] = FLOORF(a[0]);
602 result[1] = FLOORF(a[1]);
603 result[2] = FLOORF(a[2]);
604 result[3] = FLOORF(a[3]);
605 store_vector4( inst, machine, result );
606 }
607 break;
608 case FP_OPCODE_FRC:
609 {
610 GLfloat a[4], result[4];
611 fetch_vector4( &inst->SrcReg[0], machine, a );
612 result[0] = a[0] - FLOORF(a[0]);
613 result[1] = a[1] - FLOORF(a[1]);
614 result[2] = a[2] - FLOORF(a[2]);
615 result[3] = a[3] - FLOORF(a[3]);
616 store_vector4( inst, machine, result );
617 }
618 break;
619 case FP_OPCODE_KIL:
620 {
621 const GLuint *swizzle = inst->DstReg.CondSwizzle;
622 const GLuint condMask = inst->DstReg.CondMask;
623 if (test_cc(machine->CondCodes[swizzle[0]], condMask) ||
624 test_cc(machine->CondCodes[swizzle[1]], condMask) ||
625 test_cc(machine->CondCodes[swizzle[2]], condMask) ||
626 test_cc(machine->CondCodes[swizzle[3]], condMask))
627 return GL_FALSE;
628 }
629 break;
630 case FP_OPCODE_LG2: /* log base 2 */
631 {
632 GLfloat a[4], result[4];
633 fetch_vector1( &inst->SrcReg[0], machine, a );
634 result[0] = result[1] = result[2] = result[3]
635 = LOG2(a[0]);
636 store_vector4( inst, machine, result );
637 }
638 break;
639 case FP_OPCODE_LIT:
640 {
641 GLfloat a[4], result[4];
642 fetch_vector4( &inst->SrcReg[0], machine, a );
643 if (a[0] < 0.0F)
644 a[0] = 0.0F;
645 if (a[1] < 0.0F)
646 a[1] = 0.0F;
647 result[0] = 1.0F;
648 result[1] = a[0];
649 result[2] = (a[0] > 0.0) ? _mesa_pow(2.0, a[3]) : 0.0F;
650 result[3] = 1.0F;
651 store_vector4( inst, machine, result );
652 }
653 break;
654 case FP_OPCODE_LRP:
655 {
656 GLfloat a[4], b[4], c[4], result[4];
657 fetch_vector4( &inst->SrcReg[0], machine, a );
658 fetch_vector4( &inst->SrcReg[1], machine, b );
659 fetch_vector4( &inst->SrcReg[2], machine, c );
660 result[0] = a[0] * b[0] + (1.0F - a[0]) * c[0];
661 result[1] = a[1] * b[1] + (1.0F - a[1]) * c[1];
662 result[2] = a[2] * b[2] + (1.0F - a[2]) * c[2];
663 result[3] = a[3] * b[3] + (1.0F - a[3]) * c[3];
664 store_vector4( inst, machine, result );
665 }
666 break;
667 case FP_OPCODE_MAD:
668 {
669 GLfloat a[4], b[4], c[4], result[4];
670 fetch_vector4( &inst->SrcReg[0], machine, a );
671 fetch_vector4( &inst->SrcReg[1], machine, b );
672 fetch_vector4( &inst->SrcReg[2], machine, c );
673 result[0] = a[0] * b[0] + c[0];
674 result[1] = a[1] * b[1] + c[1];
675 result[2] = a[2] * b[2] + c[2];
676 result[3] = a[3] * b[3] + c[3];
677 store_vector4( inst, machine, result );
678 }
679 break;
680 case FP_OPCODE_MAX:
681 {
682 GLfloat a[4], b[4], result[4];
683 fetch_vector4( &inst->SrcReg[0], machine, a );
684 fetch_vector4( &inst->SrcReg[1], machine, b );
685 result[0] = MAX2(a[0], b[0]);
686 result[1] = MAX2(a[1], b[1]);
687 result[2] = MAX2(a[2], b[2]);
688 result[3] = MAX2(a[3], b[3]);
689 store_vector4( inst, machine, result );
690 }
691 break;
692 case FP_OPCODE_MIN:
693 {
694 GLfloat a[4], b[4], result[4];
695 fetch_vector4( &inst->SrcReg[0], machine, a );
696 fetch_vector4( &inst->SrcReg[1], machine, b );
697 result[0] = MIN2(a[0], b[0]);
698 result[1] = MIN2(a[1], b[1]);
699 result[2] = MIN2(a[2], b[2]);
700 result[3] = MIN2(a[3], b[3]);
701 store_vector4( inst, machine, result );
702 }
703 break;
704 case FP_OPCODE_MOV:
705 {
706 GLfloat result[4];
707 fetch_vector4( &inst->SrcReg[0], machine, result );
708 store_vector4( inst, machine, result );
709 }
710 break;
711 case FP_OPCODE_MUL:
712 {
713 GLfloat a[4], b[4], result[4];
714 fetch_vector4( &inst->SrcReg[0], machine, a );
715 fetch_vector4( &inst->SrcReg[1], machine, b );
716 result[0] = a[0] * b[0];
717 result[1] = a[1] * b[1];
718 result[2] = a[2] * b[2];
719 result[3] = a[3] * b[3];
720 store_vector4( inst, machine, result );
721 }
722 break;
723 case FP_OPCODE_PK2H: /* pack two 16-bit floats */
724 /* XXX this is probably wrong */
725 {
726 GLfloat a[4], result[4];
727 const GLuint *rawBits = (const GLuint *) a;
728 GLuint *rawResult = (GLuint *) result;
729 fetch_vector4( &inst->SrcReg[0], machine, a );
730 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
731 = rawBits[0] | (rawBits[1] << 16);
732 store_vector4( inst, machine, result );
733 }
734 break;
735 case FP_OPCODE_PK2US: /* pack two GLushorts */
736 {
737 GLfloat a[4], result[4];
738 GLuint usx, usy, *rawResult = (GLuint *) result;
739 fetch_vector4( &inst->SrcReg[0], machine, a );
740 a[0] = CLAMP(a[0], 0.0F, 1.0F);
741 a[1] = CLAMP(a[0], 0.0F, 1.0F);
742 usx = IROUND(a[0] * 65535.0F);
743 usy = IROUND(a[1] * 65535.0F);
744 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
745 = usx | (usy << 16);
746 store_vector4( inst, machine, result );
747 }
748 break;
749 case FP_OPCODE_PK4B: /* pack four GLbytes */
750 {
751 GLfloat a[4], result[4];
752 GLuint ubx, uby, ubz, ubw, *rawResult = (GLuint *) result;
753 fetch_vector4( &inst->SrcReg[0], machine, a );
754 a[0] = CLAMP(a[0], -128.0F / 127.0F, 1.0F);
755 a[1] = CLAMP(a[1], -128.0F / 127.0F, 1.0F);
756 a[2] = CLAMP(a[2], -128.0F / 127.0F, 1.0F);
757 a[3] = CLAMP(a[3], -128.0F / 127.0F, 1.0F);
758 ubx = IROUND(127.0F * a[0] + 128.0F);
759 uby = IROUND(127.0F * a[1] + 128.0F);
760 ubz = IROUND(127.0F * a[2] + 128.0F);
761 ubw = IROUND(127.0F * a[3] + 128.0F);
762 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
763 = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
764 store_vector4( inst, machine, result );
765 }
766 break;
767 case FP_OPCODE_PK4UB: /* pack four GLubytes */
768 {
769 GLfloat a[4], result[4];
770 GLuint ubx, uby, ubz, ubw, *rawResult = (GLuint *) result;
771 fetch_vector4( &inst->SrcReg[0], machine, a );
772 a[0] = CLAMP(a[0], 0.0F, 1.0F);
773 a[1] = CLAMP(a[1], 0.0F, 1.0F);
774 a[2] = CLAMP(a[2], 0.0F, 1.0F);
775 a[3] = CLAMP(a[3], 0.0F, 1.0F);
776 ubx = IROUND(255.0F * a[0]);
777 uby = IROUND(255.0F * a[1]);
778 ubz = IROUND(255.0F * a[2]);
779 ubw = IROUND(255.0F * a[3]);
780 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
781 = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
782 store_vector4( inst, machine, result );
783 }
784 break;
785 case FP_OPCODE_POW:
786 {
787 GLfloat a[4], b[4], result[4];
788 fetch_vector1( &inst->SrcReg[0], machine, a );
789 fetch_vector1( &inst->SrcReg[1], machine, b );
790 result[0] = result[1] = result[2] = result[3]
791 = _mesa_pow(a[0], b[0]);
792 store_vector4( inst, machine, result );
793 }
794 break;
795 case FP_OPCODE_RCP:
796 {
797 GLfloat a[4], result[4];
798 fetch_vector1( &inst->SrcReg[0], machine, a );
799 result[0] = result[1] = result[2] = result[3]
800 = 1.0F / a[0];
801 store_vector4( inst, machine, result );
802 }
803 break;
804 case FP_OPCODE_RFL:
805 {
806 GLfloat axis[4], dir[4], result[4], tmp[4];
807 fetch_vector4( &inst->SrcReg[0], machine, axis );
808 fetch_vector4( &inst->SrcReg[1], machine, dir );
809 tmp[3] = axis[0] * axis[0]
810 + axis[1] * axis[1]
811 + axis[2] * axis[2];
812 tmp[0] = (2.0F * (axis[0] * dir[0] +
813 axis[1] * dir[1] +
814 axis[2] * dir[2])) / tmp[3];
815 result[0] = tmp[0] * axis[0] - dir[0];
816 result[1] = tmp[0] * axis[1] - dir[1];
817 result[2] = tmp[0] * axis[2] - dir[2];
818 /* result[3] is never written! XXX enforce in parser! */
819 store_vector4( inst, machine, result );
820 }
821 break;
822 case FP_OPCODE_RSQ: /* 1 / sqrt() */
823 {
824 GLfloat a[4], result[4];
825 fetch_vector1( &inst->SrcReg[0], machine, a );
826 result[0] = result[1] = result[2] = result[3] = INV_SQRTF(a[0]);
827 store_vector4( inst, machine, result );
828 }
829 break;
830 case FP_OPCODE_SEQ: /* set on equal */
831 {
832 GLfloat a[4], b[4], result[4];
833 fetch_vector4( &inst->SrcReg[0], machine, a );
834 fetch_vector4( &inst->SrcReg[1], machine, b );
835 result[0] = (a[0] == b[0]) ? 1.0F : 0.0F;
836 result[1] = (a[1] == b[1]) ? 1.0F : 0.0F;
837 result[2] = (a[2] == b[2]) ? 1.0F : 0.0F;
838 result[3] = (a[3] == b[3]) ? 1.0F : 0.0F;
839 store_vector4( inst, machine, result );
840 }
841 break;
842 case FP_OPCODE_SFL: /* set false, operands ignored */
843 {
844 static const GLfloat result[4] = { 0.0F, 0.0F, 0.0F, 0.0F };
845 store_vector4( inst, machine, result );
846 }
847 break;
848 case FP_OPCODE_SGE: /* set on greater or equal */
849 {
850 GLfloat a[4], b[4], result[4];
851 fetch_vector4( &inst->SrcReg[0], machine, a );
852 fetch_vector4( &inst->SrcReg[1], machine, b );
853 result[0] = (a[0] >= b[0]) ? 1.0F : 0.0F;
854 result[1] = (a[1] >= b[1]) ? 1.0F : 0.0F;
855 result[2] = (a[2] >= b[2]) ? 1.0F : 0.0F;
856 result[3] = (a[3] >= b[3]) ? 1.0F : 0.0F;
857 store_vector4( inst, machine, result );
858 }
859 break;
860 case FP_OPCODE_SGT: /* set on greater */
861 {
862 GLfloat a[4], b[4], result[4];
863 fetch_vector4( &inst->SrcReg[0], machine, a );
864 fetch_vector4( &inst->SrcReg[1], machine, b );
865 result[0] = (a[0] > b[0]) ? 1.0F : 0.0F;
866 result[1] = (a[1] > b[1]) ? 1.0F : 0.0F;
867 result[2] = (a[2] > b[2]) ? 1.0F : 0.0F;
868 result[3] = (a[3] > b[3]) ? 1.0F : 0.0F;
869 store_vector4( inst, machine, result );
870 }
871 break;
872 case FP_OPCODE_SIN:
873 {
874 GLfloat a[4], result[4];
875 fetch_vector1( &inst->SrcReg[0], machine, a );
876 result[0] = result[1] = result[2] = result[3] = _mesa_sin(a[0]);
877 store_vector4( inst, machine, result );
878 }
879 break;
880 case FP_OPCODE_SLE: /* set on less or equal */
881 {
882 GLfloat a[4], b[4], result[4];
883 fetch_vector4( &inst->SrcReg[0], machine, a );
884 fetch_vector4( &inst->SrcReg[1], machine, b );
885 result[0] = (a[0] <= b[0]) ? 1.0F : 0.0F;
886 result[1] = (a[1] <= b[1]) ? 1.0F : 0.0F;
887 result[2] = (a[2] <= b[2]) ? 1.0F : 0.0F;
888 result[3] = (a[3] <= b[3]) ? 1.0F : 0.0F;
889 store_vector4( inst, machine, result );
890 }
891 break;
892 case FP_OPCODE_SLT: /* set on less */
893 {
894 GLfloat a[4], b[4], result[4];
895 fetch_vector4( &inst->SrcReg[0], machine, a );
896 fetch_vector4( &inst->SrcReg[1], machine, b );
897 result[0] = (a[0] < b[0]) ? 1.0F : 0.0F;
898 result[1] = (a[1] < b[1]) ? 1.0F : 0.0F;
899 result[2] = (a[2] < b[2]) ? 1.0F : 0.0F;
900 result[3] = (a[3] < b[3]) ? 1.0F : 0.0F;
901 store_vector4( inst, machine, result );
902 }
903 break;
904 case FP_OPCODE_SNE: /* set on not equal */
905 {
906 GLfloat a[4], b[4], result[4];
907 fetch_vector4( &inst->SrcReg[0], machine, a );
908 fetch_vector4( &inst->SrcReg[1], machine, b );
909 result[0] = (a[0] != b[0]) ? 1.0F : 0.0F;
910 result[1] = (a[1] != b[1]) ? 1.0F : 0.0F;
911 result[2] = (a[2] != b[2]) ? 1.0F : 0.0F;
912 result[3] = (a[3] != b[3]) ? 1.0F : 0.0F;
913 store_vector4( inst, machine, result );
914 }
915 break;
916 case FP_OPCODE_STR: /* set true, operands ignored */
917 {
918 static const GLfloat result[4] = { 1.0F, 1.0F, 1.0F, 1.0F };
919 store_vector4( inst, machine, result );
920 }
921 break;
922 case FP_OPCODE_SUB:
923 {
924 GLfloat a[4], b[4], result[4];
925 fetch_vector4( &inst->SrcReg[0], machine, a );
926 fetch_vector4( &inst->SrcReg[1], machine, b );
927 result[0] = a[0] - b[0];
928 result[1] = a[1] - b[1];
929 result[2] = a[2] - b[2];
930 result[3] = a[3] - b[3];
931 store_vector4( inst, machine, result );
932 }
933 break;
934 case FP_OPCODE_TEX:
935 /* Texel lookup */
936 {
937 GLfloat texcoord[4], color[4];
938 fetch_vector4( &inst->SrcReg[0], machine, texcoord );
939 /* XXX: Undo perspective divide from interpolate_texcoords() */
940 fetch_texel( ctx, texcoord, inst->TexSrcUnit, color );
941 store_vector4( inst, machine, color );
942 }
943 break;
944 case FP_OPCODE_TXD:
945 /* Texture lookup w/ partial derivatives for LOD */
946 {
947 GLfloat texcoord[4], dtdx[4], dtdy[4], color[4];
948 fetch_vector4( &inst->SrcReg[0], machine, texcoord );
949 fetch_vector4( &inst->SrcReg[1], machine, dtdx );
950 fetch_vector4( &inst->SrcReg[2], machine, dtdy );
951 fetch_texel_deriv( ctx, texcoord, dtdx, dtdy, inst->TexSrcUnit,
952 color );
953 store_vector4( inst, machine, color );
954 }
955 break;
956 case FP_OPCODE_TXP:
957 /* Texture lookup w/ perspective divide */
958 {
959 GLfloat texcoord[4], color[4];
960 fetch_vector4( &inst->SrcReg[0], machine, texcoord );
961 /* Already did perspective divide in interpolate_texcoords() */
962 fetch_texel( ctx, texcoord, inst->TexSrcUnit, color );
963 store_vector4( inst, machine, color );
964 }
965 break;
966 case FP_OPCODE_UP2H: /* unpack two 16-bit floats */
967 /* XXX this is probably wrong */
968 {
969 GLfloat a[4], result[4];
970 const GLuint *rawBits = (const GLuint *) a;
971 GLuint *rawResult = (GLuint *) result;
972 fetch_vector1( &inst->SrcReg[0], machine, a );
973 rawResult[0] = rawBits[0] & 0xffff;
974 rawResult[1] = (rawBits[0] >> 16) & 0xffff;
975 rawResult[2] = rawBits[0] & 0xffff;
976 rawResult[3] = (rawBits[0] >> 16) & 0xffff;
977 store_vector4( inst, machine, result );
978 }
979 break;
980 case FP_OPCODE_UP2US: /* unpack two GLushorts */
981 {
982 GLfloat a[4], result[4];
983 const GLuint *rawBits = (const GLuint *) a;
984 fetch_vector1( &inst->SrcReg[0], machine, a );
985 result[0] = (GLfloat) ((rawBits[0] >> 0) & 0xffff) / 65535.0F;
986 result[1] = (GLfloat) ((rawBits[0] >> 16) & 0xffff) / 65535.0F;
987 result[2] = result[0];
988 result[3] = result[1];
989 store_vector4( inst, machine, result );
990 }
991 break;
992 case FP_OPCODE_UP4B: /* unpack four GLbytes */
993 {
994 GLfloat a[4], result[4];
995 const GLuint *rawBits = (const GLuint *) a;
996 fetch_vector1( &inst->SrcReg[0], machine, a );
997 result[0] = (((rawBits[0] >> 0) & 0xff) - 128) / 127.0F;
998 result[0] = (((rawBits[0] >> 8) & 0xff) - 128) / 127.0F;
999 result[0] = (((rawBits[0] >> 16) & 0xff) - 128) / 127.0F;
1000 result[0] = (((rawBits[0] >> 24) & 0xff) - 128) / 127.0F;
1001 store_vector4( inst, machine, result );
1002 }
1003 break;
1004 case FP_OPCODE_UP4UB: /* unpack four GLubytes */
1005 {
1006 GLfloat a[4], result[4];
1007 const GLuint *rawBits = (const GLuint *) a;
1008 fetch_vector1( &inst->SrcReg[0], machine, a );
1009 result[0] = ((rawBits[0] >> 0) & 0xff) / 255.0F;
1010 result[0] = ((rawBits[0] >> 8) & 0xff) / 255.0F;
1011 result[0] = ((rawBits[0] >> 16) & 0xff) / 255.0F;
1012 result[0] = ((rawBits[0] >> 24) & 0xff) / 255.0F;
1013 store_vector4( inst, machine, result );
1014 }
1015 break;
1016 case FP_OPCODE_X2D: /* 2-D matrix transform */
1017 {
1018 GLfloat a[4], b[4], c[4], result[4];
1019 fetch_vector4( &inst->SrcReg[0], machine, a );
1020 fetch_vector4( &inst->SrcReg[1], machine, b );
1021 fetch_vector4( &inst->SrcReg[2], machine, c );
1022 result[0] = a[0] + b[0] * c[0] + b[1] * c[1];
1023 result[1] = a[1] + b[0] * c[2] + b[1] * c[3];
1024 result[2] = a[2] + b[0] * c[0] + b[1] * c[1];
1025 result[3] = a[3] + b[0] * c[2] + b[1] * c[3];
1026 store_vector4( inst, machine, result );
1027 }
1028 break;
1029 case FP_OPCODE_END:
1030 return GL_TRUE;
1031 default:
1032 _mesa_problem(ctx, "Bad opcode %d in _mesa_exec_fragment_program",
1033 inst->Opcode);
1034 return GL_TRUE; /* return value doesn't matter */
1035 }
1036 }
1037 return GL_TRUE;
1038 }
1039
1040
1041 static void
1042 init_machine( GLcontext *ctx, struct fp_machine *machine,
1043 const struct fragment_program *program,
1044 const struct sw_span *span, GLuint col )
1045 {
1046 GLuint j, u;
1047
1048 /* Clear temporary registers */
1049 _mesa_bzero(machine->Registers + FP_TEMP_REG_START,
1050 MAX_NV_FRAGMENT_PROGRAM_TEMPS * 4 * sizeof(GLfloat));
1051
1052 /* Load program local parameters */
1053 for (j = 0; j < MAX_NV_FRAGMENT_PROGRAM_PARAMS; j++) {
1054 COPY_4V(machine->Registers[FP_PROG_REG_START + j],
1055 program->LocalParams[j]);
1056 }
1057
1058 /* Load input registers */
1059 if (program->InputsRead & (1 << FRAG_ATTRIB_WPOS)) {
1060 GLfloat *wpos = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_WPOS];
1061 wpos[0] = span->x + col;
1062 wpos[1] = span->y;
1063 wpos[2] = (GLfloat) span->array->z[col] / ctx->DepthMaxF;
1064 wpos[3] = span->w + col * span->dwdx;
1065 }
1066 if (program->InputsRead & (1 << FRAG_ATTRIB_COL0)) {
1067 GLfloat *col0 = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_COL0];
1068 col0[0] = CHAN_TO_FLOAT(span->array->rgba[col][RCOMP]);
1069 col0[1] = CHAN_TO_FLOAT(span->array->rgba[col][GCOMP]);
1070 col0[2] = CHAN_TO_FLOAT(span->array->rgba[col][BCOMP]);
1071 col0[3] = CHAN_TO_FLOAT(span->array->rgba[col][ACOMP]);
1072 }
1073 if (program->InputsRead & (1 << FRAG_ATTRIB_COL1)) {
1074 GLfloat *col1 = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_COL1];
1075 col1[0] = CHAN_TO_FLOAT(span->array->spec[col][RCOMP]);
1076 col1[1] = CHAN_TO_FLOAT(span->array->spec[col][GCOMP]);
1077 col1[2] = CHAN_TO_FLOAT(span->array->spec[col][BCOMP]);
1078 col1[3] = CHAN_TO_FLOAT(span->array->spec[col][ACOMP]);
1079 }
1080 if (program->InputsRead & (1 << FRAG_ATTRIB_FOGC)) {
1081 GLfloat *fogc = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_FOGC];
1082 fogc[0] = span->array->fog[col];
1083 fogc[1] = 0.0F;
1084 fogc[2] = 0.0F;
1085 fogc[3] = 0.0F;
1086 }
1087 for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
1088 if (program->InputsRead & (1 << (FRAG_ATTRIB_TEX0 + u))) {
1089 GLfloat *tex = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_TEX0+u];
1090 if (ctx->Texture.Unit[u]._ReallyEnabled) {
1091 COPY_4V(tex, span->array->texcoords[u][col]);
1092 }
1093 else {
1094 COPY_4V(tex, ctx->Current.Attrib[VERT_ATTRIB_TEX0 + u]);
1095 }
1096 }
1097 }
1098 }
1099
1100
1101 void
1102 _swrast_exec_nv_fragment_program( GLcontext *ctx, struct sw_span *span )
1103 {
1104 const struct fragment_program *program = ctx->FragmentProgram.Current;
1105 GLuint i;
1106
1107 for (i = 0; i < span->end; i++) {
1108 if (span->array->mask[i]) {
1109 init_machine(ctx, &ctx->FragmentProgram.Machine,
1110 ctx->FragmentProgram.Current, span, i);
1111
1112 if (!execute_program(ctx, program, ~0,
1113 &ctx->FragmentProgram.Machine, span))
1114 span->array->mask[i] = GL_FALSE; /* killed fragment */
1115
1116 /* Store output registers */
1117 {
1118 const GLfloat *colOut
1119 = ctx->FragmentProgram.Machine.Registers[FP_OUTPUT_REG_START];
1120 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][RCOMP], colOut[0]);
1121 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][GCOMP], colOut[1]);
1122 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][BCOMP], colOut[2]);
1123 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][ACOMP], colOut[3]);
1124 }
1125 /* depth value */
1126 if (ctx->FragmentProgram.Current->OutputsWritten & 2)
1127 span->array->z[i] = IROUND(ctx->FragmentProgram.Machine.Registers[FP_OUTPUT_REG_START + 2][0] * ctx->DepthMaxF);
1128 }
1129 }
1130 }
1131