projects / mesa.git / blob
? search:


b34703b857903b2d5a02217d6b1bc472fc8b18ca
[mesa.git] / src / mesa / swrast / s_nvfragprog.c
1 /* $Id: s_nvfragprog.c,v 1.13 2003/04/05 00:38:10 brianp 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 = _swrast_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 const struct fragment_program *program,
103 GLfloat result[4] )
104 {
105 const GLfloat *src;
106
107 if (source->IsParameter) {
108 src = program->Parameters[source->Register].Values;
109 }
110 else {
111 src = machine->Registers[source->Register];
112 }
113
114 result[0] = src[source->Swizzle[0]];
115 result[1] = src[source->Swizzle[1]];
116 result[2] = src[source->Swizzle[2]];
117 result[3] = src[source->Swizzle[3]];
118
119 if (source->NegateBase) {
120 result[0] = -result[0];
121 result[1] = -result[1];
122 result[2] = -result[2];
123 result[3] = -result[3];
124 }
125 if (source->Abs) {
126 result[0] = FABSF(result[0]);
127 result[1] = FABSF(result[1]);
128 result[2] = FABSF(result[2]);
129 result[3] = FABSF(result[3]);
130 }
131 if (source->NegateAbs) {
132 result[0] = -result[0];
133 result[1] = -result[1];
134 result[2] = -result[2];
135 result[3] = -result[3];
136 }
137 }
138
139
140 /**
141 * Fetch the derivative with respect to X for the given register.
142 * \return GL_TRUE if it was easily computed or GL_FALSE if we
143 * need to execute another instance of the program (ugh)!
144 */
145 static GLboolean
146 fetch_vector4_deriv( const struct fp_src_register *source,
147 const struct sw_span *span,
148 char xOrY, GLfloat result[4] )
149 {
150 GLfloat src[4];
151
152 ASSERT(xOrY == 'X' || xOrY == 'Y');
153
154 switch (source->Register) {
155 case FRAG_ATTRIB_WPOS:
156 if (xOrY == 'X') {
157 src[0] = 1.0;
158 src[1] = 0.0;
159 src[2] = span->dzdx;
160 src[3] = span->dwdx;
161 }
162 else {
163 src[0] = 0.0;
164 src[1] = 1.0;
165 src[2] = span->dzdy;
166 src[3] = span->dwdy;
167 }
168 break;
169 case FRAG_ATTRIB_COL0:
170 if (xOrY == 'X') {
171 src[0] = span->drdx * (1.0F / CHAN_MAXF);
172 src[1] = span->dgdx * (1.0F / CHAN_MAXF);
173 src[2] = span->dbdx * (1.0F / CHAN_MAXF);
174 src[3] = span->dadx * (1.0F / CHAN_MAXF);
175 }
176 else {
177 src[0] = span->drdy * (1.0F / CHAN_MAXF);
178 src[1] = span->dgdy * (1.0F / CHAN_MAXF);
179 src[2] = span->dbdy * (1.0F / CHAN_MAXF);
180 src[3] = span->dady * (1.0F / CHAN_MAXF);
181 }
182 break;
183 case FRAG_ATTRIB_COL1:
184 if (xOrY == 'X') {
185 src[0] = span->dsrdx * (1.0F / CHAN_MAXF);
186 src[1] = span->dsgdx * (1.0F / CHAN_MAXF);
187 src[2] = span->dsbdx * (1.0F / CHAN_MAXF);
188 src[3] = 0.0; /* XXX need this */
189 }
190 else {
191 src[0] = span->dsrdy * (1.0F / CHAN_MAXF);
192 src[1] = span->dsgdy * (1.0F / CHAN_MAXF);
193 src[2] = span->dsbdy * (1.0F / CHAN_MAXF);
194 src[3] = 0.0; /* XXX need this */
195 }
196 break;
197 case FRAG_ATTRIB_FOGC:
198 if (xOrY == 'X') {
199 src[0] = span->dfogdx;
200 src[1] = 0.0;
201 src[2] = 0.0;
202 src[3] = 0.0;
203 }
204 else {
205 src[0] = span->dfogdy;
206 src[1] = 0.0;
207 src[2] = 0.0;
208 src[3] = 0.0;
209 }
210 break;
211 case FRAG_ATTRIB_TEX0:
212 case FRAG_ATTRIB_TEX1:
213 case FRAG_ATTRIB_TEX2:
214 case FRAG_ATTRIB_TEX3:
215 case FRAG_ATTRIB_TEX4:
216 case FRAG_ATTRIB_TEX5:
217 case FRAG_ATTRIB_TEX6:
218 case FRAG_ATTRIB_TEX7:
219 if (xOrY == 'X') {
220 const GLuint u = source->Register - FRAG_ATTRIB_TEX0;
221 src[0] = span->texStepX[u][0] * (1.0F / CHAN_MAXF);
222 src[1] = span->texStepX[u][1] * (1.0F / CHAN_MAXF);
223 src[2] = span->texStepX[u][2] * (1.0F / CHAN_MAXF);
224 src[3] = span->texStepX[u][3] * (1.0F / CHAN_MAXF);
225 }
226 else {
227 const GLuint u = source->Register - FRAG_ATTRIB_TEX0;
228 src[0] = span->texStepY[u][0] * (1.0F / CHAN_MAXF);
229 src[1] = span->texStepY[u][1] * (1.0F / CHAN_MAXF);
230 src[2] = span->texStepY[u][2] * (1.0F / CHAN_MAXF);
231 src[3] = span->texStepY[u][3] * (1.0F / CHAN_MAXF);
232 }
233 break;
234 default:
235 return GL_FALSE;
236 }
237
238 result[0] = src[source->Swizzle[0]];
239 result[1] = src[source->Swizzle[1]];
240 result[2] = src[source->Swizzle[2]];
241 result[3] = src[source->Swizzle[3]];
242
243 if (source->NegateBase) {
244 result[0] = -result[0];
245 result[1] = -result[1];
246 result[2] = -result[2];
247 result[3] = -result[3];
248 }
249 if (source->Abs) {
250 result[0] = FABSF(result[0]);
251 result[1] = FABSF(result[1]);
252 result[2] = FABSF(result[2]);
253 result[3] = FABSF(result[3]);
254 }
255 if (source->NegateAbs) {
256 result[0] = -result[0];
257 result[1] = -result[1];
258 result[2] = -result[2];
259 result[3] = -result[3];
260 }
261 return GL_TRUE;
262 }
263
264
265 /**
266 * As above, but only return result[0] element.
267 */
268 static void
269 fetch_vector1( const struct fp_src_register *source,
270 const struct fp_machine *machine,
271 const struct fragment_program *program,
272 GLfloat result[4] )
273 {
274 const GLfloat *src;
275
276 if (source->IsParameter) {
277 src = program->Parameters[source->Register].Values;
278 }
279 else {
280 src = machine->Registers[source->Register];
281 }
282
283 result[0] = src[source->Swizzle[0]];
284
285 if (source->NegateBase) {
286 result[0] = -result[0];
287 }
288 if (source->Abs) {
289 result[0] = FABSF(result[0]);
290 }
291 if (source->NegateAbs) {
292 result[0] = -result[0];
293 }
294 }
295
296
297 /*
298 * Test value against zero and return GT, LT, EQ or UN if NaN.
299 */
300 static INLINE GLuint
301 generate_cc( float value )
302 {
303 if (value != value)
304 return COND_UN; /* NaN */
305 if (value > 0.0F)
306 return COND_GT;
307 if (value < 0.0F)
308 return COND_LT;
309 return COND_EQ;
310 }
311
312 /*
313 * Test if the ccMaskRule is satisfied by the given condition code.
314 * Used to mask destination writes according to the current condition codee.
315 */
316 static INLINE GLboolean
317 test_cc(GLuint condCode, GLuint ccMaskRule)
318 {
319 switch (ccMaskRule) {
320 case COND_EQ: return (condCode == COND_EQ);
321 case COND_NE: return (condCode != COND_EQ);
322 case COND_LT: return (condCode == COND_LT);
323 case COND_GE: return (condCode == COND_GT || condCode == COND_EQ);
324 case COND_LE: return (condCode == COND_LT || condCode == COND_EQ);
325 case COND_GT: return (condCode == COND_GT);
326 case COND_TR: return GL_TRUE;
327 case COND_FL: return GL_FALSE;
328 default: return GL_TRUE;
329 }
330 }
331
332
333 /**
334 * Store 4 floats into a register. Observe the instructions saturate and
335 * set-condition-code flags.
336 */
337 static void
338 store_vector4( const struct fp_instruction *inst,
339 struct fp_machine *machine,
340 const GLfloat value[4] )
341 {
342 const struct fp_dst_register *dest = &(inst->DstReg);
343 const GLboolean clamp = inst->Saturate;
344 const GLboolean updateCC = inst->UpdateCondRegister;
345 GLfloat *dstReg = machine->Registers[dest->Register];
346 GLfloat clampedValue[4];
347 const GLboolean *writeMask = dest->WriteMask;
348 GLboolean condWriteMask[4];
349
350 if (clamp) {
351 clampedValue[0] = CLAMP(value[0], 0.0F, 1.0F);
352 clampedValue[1] = CLAMP(value[1], 0.0F, 1.0F);
353 clampedValue[2] = CLAMP(value[2], 0.0F, 1.0F);
354 clampedValue[3] = CLAMP(value[3], 0.0F, 1.0F);
355 value = clampedValue;
356 }
357
358 if (dest->CondMask != COND_TR) {
359 condWriteMask[0] = writeMask[0]
360 && test_cc(machine->CondCodes[dest->CondSwizzle[0]], dest->CondMask);
361 condWriteMask[1] = writeMask[1]
362 && test_cc(machine->CondCodes[dest->CondSwizzle[1]], dest->CondMask);
363 condWriteMask[2] = writeMask[2]
364 && test_cc(machine->CondCodes[dest->CondSwizzle[2]], dest->CondMask);
365 condWriteMask[3] = writeMask[3]
366 && test_cc(machine->CondCodes[dest->CondSwizzle[3]], dest->CondMask);
367 writeMask = condWriteMask;
368 }
369
370 if (writeMask[0]) {
371 dstReg[0] = value[0];
372 if (updateCC)
373 machine->CondCodes[0] = generate_cc(value[0]);
374 }
375 if (writeMask[1]) {
376 dstReg[1] = value[1];
377 if (updateCC)
378 machine->CondCodes[1] = generate_cc(value[1]);
379 }
380 if (writeMask[2]) {
381 dstReg[2] = value[2];
382 if (updateCC)
383 machine->CondCodes[2] = generate_cc(value[2]);
384 }
385 if (writeMask[3]) {
386 dstReg[3] = value[3];
387 if (updateCC)
388 machine->CondCodes[3] = generate_cc(value[3]);
389 }
390 }
391
392
393 /**
394 * Initialize a new machine state instance from an existing one, adding
395 * the partial derivatives onto the input registers.
396 * Used to implement DDX and DDY instructions in non-trivial cases.
397 */
398 static void
399 init_machine_deriv( GLcontext *ctx,
400 const struct fp_machine *machine,
401 const struct fragment_program *program,
402 const struct sw_span *span, char xOrY,
403 struct fp_machine *dMachine )
404 {
405 GLuint u;
406
407 ASSERT(xOrY == 'X' || xOrY == 'Y');
408
409 /* copy existing machine */
410 _mesa_memcpy(dMachine, machine, sizeof(struct fp_machine));
411
412 /* Clear temporary registers */
413 _mesa_bzero((GLfloat*) (machine->Registers + FP_TEMP_REG_START) ,
414 MAX_NV_FRAGMENT_PROGRAM_TEMPS * 4 * sizeof(GLfloat));
415
416 /* Add derivatives */
417 if (program->InputsRead & (1 << FRAG_ATTRIB_WPOS)) {
418 GLfloat *wpos = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_WPOS];
419 if (xOrY == 'X') {
420 wpos[0] += 1.0F;
421 wpos[1] += 0.0F;
422 wpos[2] += span->dzdx;
423 wpos[3] += span->dwdx;
424 }
425 else {
426 wpos[0] += 0.0F;
427 wpos[1] += 1.0F;
428 wpos[2] += span->dzdy;
429 wpos[3] += span->dwdy;
430 }
431 }
432 if (program->InputsRead & (1 << FRAG_ATTRIB_COL0)) {
433 GLfloat *col0 = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_COL0];
434 if (xOrY == 'X') {
435 col0[0] += span->drdx * (1.0F / CHAN_MAXF);
436 col0[1] += span->dgdx * (1.0F / CHAN_MAXF);
437 col0[2] += span->dbdx * (1.0F / CHAN_MAXF);
438 col0[3] += span->dadx * (1.0F / CHAN_MAXF);
439 }
440 else {
441 col0[0] += span->drdy * (1.0F / CHAN_MAXF);
442 col0[1] += span->dgdy * (1.0F / CHAN_MAXF);
443 col0[2] += span->dbdy * (1.0F / CHAN_MAXF);
444 col0[3] += span->dady * (1.0F / CHAN_MAXF);
445 }
446 }
447 if (program->InputsRead & (1 << FRAG_ATTRIB_COL1)) {
448 GLfloat *col1 = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_COL1];
449 if (xOrY == 'X') {
450 col1[0] += span->dsrdx * (1.0F / CHAN_MAXF);
451 col1[1] += span->dsgdx * (1.0F / CHAN_MAXF);
452 col1[2] += span->dsbdx * (1.0F / CHAN_MAXF);
453 col1[3] += 0.0; /*XXX fix */
454 }
455 else {
456 col1[0] += span->dsrdy * (1.0F / CHAN_MAXF);
457 col1[1] += span->dsgdy * (1.0F / CHAN_MAXF);
458 col1[2] += span->dsbdy * (1.0F / CHAN_MAXF);
459 col1[3] += 0.0; /*XXX fix */
460 }
461 }
462 if (program->InputsRead & (1 << FRAG_ATTRIB_FOGC)) {
463 GLfloat *fogc = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_FOGC];
464 if (xOrY == 'X') {
465 fogc[0] += span->dfogdx;
466 }
467 else {
468 fogc[0] += span->dfogdy;
469 }
470 }
471 for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
472 if (program->InputsRead & (1 << (FRAG_ATTRIB_TEX0 + u))) {
473 GLfloat *tex = (GLfloat*) machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_TEX0+u];
474 if (xOrY == 'X') {
475 tex[0] += span->texStepX[u][0];
476 tex[1] += span->texStepX[u][1];
477 tex[2] += span->texStepX[u][2];
478 tex[3] += span->texStepX[u][3];
479 }
480 else {
481 tex[0] += span->texStepY[u][0];
482 tex[1] += span->texStepY[u][1];
483 tex[2] += span->texStepY[u][2];
484 tex[3] += span->texStepY[u][3];
485 }
486 }
487 }
488 }
489
490
491 /**
492 * Execute the given vertex program.
493 * NOTE: we do everything in single-precision floating point; we don't
494 * currently observe the single/half/fixed-precision qualifiers.
495 * \param ctx - rendering context
496 * \param program - the fragment program to execute
497 * \param machine - machine state (register file)
498 * \param maxInst - max number of instructions to execute
499 * \return GL_TRUE if program completed or GL_FALSE if program executed KIL.
500 */
501 static GLboolean
502 execute_program( GLcontext *ctx,
503 const struct fragment_program *program, GLuint maxInst,
504 struct fp_machine *machine, const struct sw_span *span )
505 {
506 GLuint pc = 0;
507
508 for (pc = 0; pc < maxInst; pc++) {
509 const struct fp_instruction *inst = program->Instructions + pc;
510 switch (inst->Opcode) {
511 case FP_OPCODE_ADD:
512 {
513 GLfloat a[4], b[4], result[4];
514 fetch_vector4( &inst->SrcReg[0], machine, program, a );
515 fetch_vector4( &inst->SrcReg[1], machine, program, b );
516 result[0] = a[0] + b[0];
517 result[1] = a[1] + b[1];
518 result[2] = a[2] + b[2];
519 result[3] = a[3] + b[3];
520 store_vector4( inst, machine, result );
521 }
522 break;
523 case FP_OPCODE_COS:
524 {
525 GLfloat a[4], result[4];
526 fetch_vector1( &inst->SrcReg[0], machine, program, a );
527 result[0] = result[1] = result[2] = result[3] = _mesa_cos(a[0]);
528 store_vector4( inst, machine, result );
529 }
530 break;
531 case FP_OPCODE_DDX: /* Partial derivative with respect to X */
532 {
533 GLfloat a[4], aNext[4], result[4];
534 struct fp_machine dMachine;
535 if (!fetch_vector4_deriv(&inst->SrcReg[0], span, 'X', result)) {
536 /* This is tricky. Make a copy of the current machine state,
537 * increment the input registers by the dx or dy partial
538 * derivatives, then re-execute the program up to the
539 * preceeding instruction, then fetch the source register.
540 * Finally, find the difference in the register values for
541 * the original and derivative runs.
542 */
543 init_machine_deriv(ctx, machine, program, span,
544 'X', &dMachine);
545 execute_program(ctx, program, pc, &dMachine, span);
546 fetch_vector4( &inst->SrcReg[0], &dMachine, program, aNext );
547 result[0] = aNext[0] - a[0];
548 result[1] = aNext[1] - a[1];
549 result[2] = aNext[2] - a[2];
550 result[3] = aNext[3] - a[3];
551 }
552 store_vector4( inst, machine, result );
553 }
554 break;
555 case FP_OPCODE_DDY: /* Partial derivative with respect to Y */
556 {
557 GLfloat a[4], aNext[4], result[4];
558 struct fp_machine dMachine;
559 if (!fetch_vector4_deriv(&inst->SrcReg[0], span, 'Y', result)) {
560 init_machine_deriv(ctx, machine, program, span,
561 'Y', &dMachine);
562 execute_program(ctx, program, pc, &dMachine, span);
563 fetch_vector4( &inst->SrcReg[0], &dMachine, program, aNext );
564 result[0] = aNext[0] - a[0];
565 result[1] = aNext[1] - a[1];
566 result[2] = aNext[2] - a[2];
567 result[3] = aNext[3] - a[3];
568 }
569 store_vector4( inst, machine, result );
570 }
571 break;
572 case FP_OPCODE_DP3:
573 {
574 GLfloat a[4], b[4], result[4];
575 fetch_vector4( &inst->SrcReg[0], machine, program, a );
576 fetch_vector4( &inst->SrcReg[1], machine, program, b );
577 result[0] = result[1] = result[2] = result[3] =
578 a[0] + b[0] + a[1] * b[1] + a[2] * b[2];
579 store_vector4( inst, machine, result );
580 }
581 break;
582 case FP_OPCODE_DP4:
583 {
584 GLfloat a[4], b[4], result[4];
585 fetch_vector4( &inst->SrcReg[0], machine, program, a );
586 fetch_vector4( &inst->SrcReg[1], machine, program, b );
587 result[0] = result[1] = result[2] = result[3] =
588 a[0] + b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
589 store_vector4( inst, machine, result );
590 }
591 break;
592 case FP_OPCODE_DST: /* Distance vector */
593 {
594 GLfloat a[4], b[4], result[4];
595 fetch_vector4( &inst->SrcReg[0], machine, program, a );
596 fetch_vector4( &inst->SrcReg[1], machine, program, b );
597 result[0] = 1.0F;
598 result[1] = a[1] * b[1];
599 result[2] = a[2];
600 result[3] = b[3];
601 store_vector4( inst, machine, result );
602 }
603 break;
604 case FP_OPCODE_EX2: /* Exponential base 2 */
605 {
606 GLfloat a[4], result[4];
607 fetch_vector1( &inst->SrcReg[0], machine, program, a );
608 result[0] = result[1] = result[2] = result[3] =
609 (GLfloat) _mesa_pow(2.0, a[0]);
610 store_vector4( inst, machine, result );
611 }
612 break;
613 case FP_OPCODE_FLR:
614 {
615 GLfloat a[4], result[4];
616 fetch_vector4( &inst->SrcReg[0], machine, program, a );
617 result[0] = FLOORF(a[0]);
618 result[1] = FLOORF(a[1]);
619 result[2] = FLOORF(a[2]);
620 result[3] = FLOORF(a[3]);
621 store_vector4( inst, machine, result );
622 }
623 break;
624 case FP_OPCODE_FRC:
625 {
626 GLfloat a[4], result[4];
627 fetch_vector4( &inst->SrcReg[0], machine, program, a );
628 result[0] = a[0] - FLOORF(a[0]);
629 result[1] = a[1] - FLOORF(a[1]);
630 result[2] = a[2] - FLOORF(a[2]);
631 result[3] = a[3] - FLOORF(a[3]);
632 store_vector4( inst, machine, result );
633 }
634 break;
635 case FP_OPCODE_KIL:
636 {
637 const GLuint *swizzle = inst->DstReg.CondSwizzle;
638 const GLuint condMask = inst->DstReg.CondMask;
639 if (test_cc(machine->CondCodes[swizzle[0]], condMask) ||
640 test_cc(machine->CondCodes[swizzle[1]], condMask) ||
641 test_cc(machine->CondCodes[swizzle[2]], condMask) ||
642 test_cc(machine->CondCodes[swizzle[3]], condMask))
643 return GL_FALSE;
644 }
645 break;
646 case FP_OPCODE_LG2: /* log base 2 */
647 {
648 GLfloat a[4], result[4];
649 fetch_vector1( &inst->SrcReg[0], machine, program, a );
650 result[0] = result[1] = result[2] = result[3]
651 = LOG2(a[0]);
652 store_vector4( inst, machine, result );
653 }
654 break;
655 case FP_OPCODE_LIT:
656 {
657 GLfloat a[4], result[4];
658 fetch_vector4( &inst->SrcReg[0], machine, program, a );
659 if (a[0] < 0.0F)
660 a[0] = 0.0F;
661 if (a[1] < 0.0F)
662 a[1] = 0.0F;
663 result[0] = 1.0F;
664 result[1] = a[0];
665 result[2] = (a[0] > 0.0) ? _mesa_pow(2.0, a[3]) : 0.0F;
666 result[3] = 1.0F;
667 store_vector4( inst, machine, result );
668 }
669 break;
670 case FP_OPCODE_LRP:
671 {
672 GLfloat a[4], b[4], c[4], result[4];
673 fetch_vector4( &inst->SrcReg[0], machine, program, a );
674 fetch_vector4( &inst->SrcReg[1], machine, program, b );
675 fetch_vector4( &inst->SrcReg[2], machine, program, c );
676 result[0] = a[0] * b[0] + (1.0F - a[0]) * c[0];
677 result[1] = a[1] * b[1] + (1.0F - a[1]) * c[1];
678 result[2] = a[2] * b[2] + (1.0F - a[2]) * c[2];
679 result[3] = a[3] * b[3] + (1.0F - a[3]) * c[3];
680 store_vector4( inst, machine, result );
681 }
682 break;
683 case FP_OPCODE_MAD:
684 {
685 GLfloat a[4], b[4], c[4], result[4];
686 fetch_vector4( &inst->SrcReg[0], machine, program, a );
687 fetch_vector4( &inst->SrcReg[1], machine, program, b );
688 fetch_vector4( &inst->SrcReg[2], machine, program, c );
689 result[0] = a[0] * b[0] + c[0];
690 result[1] = a[1] * b[1] + c[1];
691 result[2] = a[2] * b[2] + c[2];
692 result[3] = a[3] * b[3] + c[3];
693 store_vector4( inst, machine, result );
694 }
695 break;
696 case FP_OPCODE_MAX:
697 {
698 GLfloat a[4], b[4], result[4];
699 fetch_vector4( &inst->SrcReg[0], machine, program, a );
700 fetch_vector4( &inst->SrcReg[1], machine, program, b );
701 result[0] = MAX2(a[0], b[0]);
702 result[1] = MAX2(a[1], b[1]);
703 result[2] = MAX2(a[2], b[2]);
704 result[3] = MAX2(a[3], b[3]);
705 store_vector4( inst, machine, result );
706 }
707 break;
708 case FP_OPCODE_MIN:
709 {
710 GLfloat a[4], b[4], result[4];
711 fetch_vector4( &inst->SrcReg[0], machine, program, a );
712 fetch_vector4( &inst->SrcReg[1], machine, program, b );
713 result[0] = MIN2(a[0], b[0]);
714 result[1] = MIN2(a[1], b[1]);
715 result[2] = MIN2(a[2], b[2]);
716 result[3] = MIN2(a[3], b[3]);
717 store_vector4( inst, machine, result );
718 }
719 break;
720 case FP_OPCODE_MOV:
721 {
722 GLfloat result[4];
723 fetch_vector4( &inst->SrcReg[0], machine, program, result );
724 store_vector4( inst, machine, result );
725 }
726 break;
727 case FP_OPCODE_MUL:
728 {
729 GLfloat a[4], b[4], result[4];
730 fetch_vector4( &inst->SrcReg[0], machine, program, a );
731 fetch_vector4( &inst->SrcReg[1], machine, program, b );
732 result[0] = a[0] * b[0];
733 result[1] = a[1] * b[1];
734 result[2] = a[2] * b[2];
735 result[3] = a[3] * b[3];
736 store_vector4( inst, machine, result );
737 }
738 break;
739 case FP_OPCODE_PK2H: /* pack two 16-bit floats */
740 /* XXX this is probably wrong */
741 {
742 GLfloat a[4], result[4];
743 const GLuint *rawBits = (const GLuint *) a;
744 GLuint *rawResult = (GLuint *) result;
745 fetch_vector4( &inst->SrcReg[0], machine, program, a );
746 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
747 = rawBits[0] | (rawBits[1] << 16);
748 store_vector4( inst, machine, result );
749 }
750 break;
751 case FP_OPCODE_PK2US: /* pack two GLushorts */
752 {
753 GLfloat a[4], result[4];
754 GLuint usx, usy, *rawResult = (GLuint *) result;
755 fetch_vector4( &inst->SrcReg[0], machine, program, a );
756 a[0] = CLAMP(a[0], 0.0F, 1.0F);
757 a[1] = CLAMP(a[0], 0.0F, 1.0F);
758 usx = IROUND(a[0] * 65535.0F);
759 usy = IROUND(a[1] * 65535.0F);
760 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
761 = usx | (usy << 16);
762 store_vector4( inst, machine, result );
763 }
764 break;
765 case FP_OPCODE_PK4B: /* pack four GLbytes */
766 {
767 GLfloat a[4], result[4];
768 GLuint ubx, uby, ubz, ubw, *rawResult = (GLuint *) result;
769 fetch_vector4( &inst->SrcReg[0], machine, program, a );
770 a[0] = CLAMP(a[0], -128.0F / 127.0F, 1.0F);
771 a[1] = CLAMP(a[1], -128.0F / 127.0F, 1.0F);
772 a[2] = CLAMP(a[2], -128.0F / 127.0F, 1.0F);
773 a[3] = CLAMP(a[3], -128.0F / 127.0F, 1.0F);
774 ubx = IROUND(127.0F * a[0] + 128.0F);
775 uby = IROUND(127.0F * a[1] + 128.0F);
776 ubz = IROUND(127.0F * a[2] + 128.0F);
777 ubw = IROUND(127.0F * a[3] + 128.0F);
778 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
779 = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
780 store_vector4( inst, machine, result );
781 }
782 break;
783 case FP_OPCODE_PK4UB: /* pack four GLubytes */
784 {
785 GLfloat a[4], result[4];
786 GLuint ubx, uby, ubz, ubw, *rawResult = (GLuint *) result;
787 fetch_vector4( &inst->SrcReg[0], machine, program, a );
788 a[0] = CLAMP(a[0], 0.0F, 1.0F);
789 a[1] = CLAMP(a[1], 0.0F, 1.0F);
790 a[2] = CLAMP(a[2], 0.0F, 1.0F);
791 a[3] = CLAMP(a[3], 0.0F, 1.0F);
792 ubx = IROUND(255.0F * a[0]);
793 uby = IROUND(255.0F * a[1]);
794 ubz = IROUND(255.0F * a[2]);
795 ubw = IROUND(255.0F * a[3]);
796 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
797 = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
798 store_vector4( inst, machine, result );
799 }
800 break;
801 case FP_OPCODE_POW:
802 {
803 GLfloat a[4], b[4], result[4];
804 fetch_vector1( &inst->SrcReg[0], machine, program, a );
805 fetch_vector1( &inst->SrcReg[1], machine, program, b );
806 result[0] = result[1] = result[2] = result[3]
807 = _mesa_pow(a[0], b[0]);
808 store_vector4( inst, machine, result );
809 }
810 break;
811 case FP_OPCODE_RCP:
812 {
813 GLfloat a[4], result[4];
814 fetch_vector1( &inst->SrcReg[0], machine, program, a );
815 result[0] = result[1] = result[2] = result[3]
816 = 1.0F / a[0];
817 store_vector4( inst, machine, result );
818 }
819 break;
820 case FP_OPCODE_RFL:
821 {
822 GLfloat axis[4], dir[4], result[4], tmp[4];
823 fetch_vector4( &inst->SrcReg[0], machine, program, axis );
824 fetch_vector4( &inst->SrcReg[1], machine, program, dir );
825 tmp[3] = axis[0] * axis[0]
826 + axis[1] * axis[1]
827 + axis[2] * axis[2];
828 tmp[0] = (2.0F * (axis[0] * dir[0] +
829 axis[1] * dir[1] +
830 axis[2] * dir[2])) / tmp[3];
831 result[0] = tmp[0] * axis[0] - dir[0];
832 result[1] = tmp[0] * axis[1] - dir[1];
833 result[2] = tmp[0] * axis[2] - dir[2];
834 /* result[3] is never written! XXX enforce in parser! */
835 store_vector4( inst, machine, result );
836 }
837 break;
838 case FP_OPCODE_RSQ: /* 1 / sqrt() */
839 {
840 GLfloat a[4], result[4];
841 fetch_vector1( &inst->SrcReg[0], machine, program, a );
842 result[0] = result[1] = result[2] = result[3] = INV_SQRTF(a[0]);
843 store_vector4( inst, machine, result );
844 }
845 break;
846 case FP_OPCODE_SEQ: /* set on equal */
847 {
848 GLfloat a[4], b[4], result[4];
849 fetch_vector4( &inst->SrcReg[0], machine, program, a );
850 fetch_vector4( &inst->SrcReg[1], machine, program, b );
851 result[0] = (a[0] == b[0]) ? 1.0F : 0.0F;
852 result[1] = (a[1] == b[1]) ? 1.0F : 0.0F;
853 result[2] = (a[2] == b[2]) ? 1.0F : 0.0F;
854 result[3] = (a[3] == b[3]) ? 1.0F : 0.0F;
855 store_vector4( inst, machine, result );
856 }
857 break;
858 case FP_OPCODE_SFL: /* set false, operands ignored */
859 {
860 static const GLfloat result[4] = { 0.0F, 0.0F, 0.0F, 0.0F };
861 store_vector4( inst, machine, result );
862 }
863 break;
864 case FP_OPCODE_SGE: /* set on greater or equal */
865 {
866 GLfloat a[4], b[4], result[4];
867 fetch_vector4( &inst->SrcReg[0], machine, program, a );
868 fetch_vector4( &inst->SrcReg[1], machine, program, b );
869 result[0] = (a[0] >= b[0]) ? 1.0F : 0.0F;
870 result[1] = (a[1] >= b[1]) ? 1.0F : 0.0F;
871 result[2] = (a[2] >= b[2]) ? 1.0F : 0.0F;
872 result[3] = (a[3] >= b[3]) ? 1.0F : 0.0F;
873 store_vector4( inst, machine, result );
874 }
875 break;
876 case FP_OPCODE_SGT: /* set on greater */
877 {
878 GLfloat a[4], b[4], result[4];
879 fetch_vector4( &inst->SrcReg[0], machine, program, a );
880 fetch_vector4( &inst->SrcReg[1], machine, program, b );
881 result[0] = (a[0] > b[0]) ? 1.0F : 0.0F;
882 result[1] = (a[1] > b[1]) ? 1.0F : 0.0F;
883 result[2] = (a[2] > b[2]) ? 1.0F : 0.0F;
884 result[3] = (a[3] > b[3]) ? 1.0F : 0.0F;
885 store_vector4( inst, machine, result );
886 }
887 break;
888 case FP_OPCODE_SIN:
889 {
890 GLfloat a[4], result[4];
891 fetch_vector1( &inst->SrcReg[0], machine, program, a );
892 result[0] = result[1] = result[2] = result[3] = _mesa_sin(a[0]);
893 store_vector4( inst, machine, result );
894 }
895 break;
896 case FP_OPCODE_SLE: /* set on less or equal */
897 {
898 GLfloat a[4], b[4], result[4];
899 fetch_vector4( &inst->SrcReg[0], machine, program, a );
900 fetch_vector4( &inst->SrcReg[1], machine, program, b );
901 result[0] = (a[0] <= b[0]) ? 1.0F : 0.0F;
902 result[1] = (a[1] <= b[1]) ? 1.0F : 0.0F;
903 result[2] = (a[2] <= b[2]) ? 1.0F : 0.0F;
904 result[3] = (a[3] <= b[3]) ? 1.0F : 0.0F;
905 store_vector4( inst, machine, result );
906 }
907 break;
908 case FP_OPCODE_SLT: /* set on less */
909 {
910 GLfloat a[4], b[4], result[4];
911 fetch_vector4( &inst->SrcReg[0], machine, program, a );
912 fetch_vector4( &inst->SrcReg[1], machine, program, b );
913 result[0] = (a[0] < b[0]) ? 1.0F : 0.0F;
914 result[1] = (a[1] < b[1]) ? 1.0F : 0.0F;
915 result[2] = (a[2] < b[2]) ? 1.0F : 0.0F;
916 result[3] = (a[3] < b[3]) ? 1.0F : 0.0F;
917 store_vector4( inst, machine, result );
918 }
919 break;
920 case FP_OPCODE_SNE: /* set on not equal */
921 {
922 GLfloat a[4], b[4], result[4];
923 fetch_vector4( &inst->SrcReg[0], machine, program, a );
924 fetch_vector4( &inst->SrcReg[1], machine, program, b );
925 result[0] = (a[0] != b[0]) ? 1.0F : 0.0F;
926 result[1] = (a[1] != b[1]) ? 1.0F : 0.0F;
927 result[2] = (a[2] != b[2]) ? 1.0F : 0.0F;
928 result[3] = (a[3] != b[3]) ? 1.0F : 0.0F;
929 store_vector4( inst, machine, result );
930 }
931 break;
932 case FP_OPCODE_STR: /* set true, operands ignored */
933 {
934 static const GLfloat result[4] = { 1.0F, 1.0F, 1.0F, 1.0F };
935 store_vector4( inst, machine, result );
936 }
937 break;
938 case FP_OPCODE_SUB:
939 {
940 GLfloat a[4], b[4], result[4];
941 fetch_vector4( &inst->SrcReg[0], machine, program, a );
942 fetch_vector4( &inst->SrcReg[1], machine, program, b );
943 result[0] = a[0] - b[0];
944 result[1] = a[1] - b[1];
945 result[2] = a[2] - b[2];
946 result[3] = a[3] - b[3];
947 store_vector4( inst, machine, result );
948 }
949 break;
950 case FP_OPCODE_TEX:
951 /* Texel lookup */
952 {
953 GLfloat texcoord[4], color[4];
954 fetch_vector4( &inst->SrcReg[0], machine, program, texcoord );
955 /* XXX: Undo perspective divide from interpolate_texcoords() */
956 fetch_texel( ctx, texcoord, inst->TexSrcUnit, color );
957 store_vector4( inst, machine, color );
958 }
959 break;
960 case FP_OPCODE_TXD:
961 /* Texture lookup w/ partial derivatives for LOD */
962 {
963 GLfloat texcoord[4], dtdx[4], dtdy[4], color[4];
964 fetch_vector4( &inst->SrcReg[0], machine, program, texcoord );
965 fetch_vector4( &inst->SrcReg[1], machine, program, dtdx );
966 fetch_vector4( &inst->SrcReg[2], machine, program, dtdy );
967 fetch_texel_deriv( ctx, texcoord, dtdx, dtdy, inst->TexSrcUnit,
968 color );
969 store_vector4( inst, machine, color );
970 }
971 break;
972 case FP_OPCODE_TXP:
973 /* Texture lookup w/ perspective divide */
974 {
975 GLfloat texcoord[4], color[4];
976 fetch_vector4( &inst->SrcReg[0], machine, program, texcoord );
977 /* Already did perspective divide in interpolate_texcoords() */
978 fetch_texel( ctx, texcoord, inst->TexSrcUnit, color );
979 store_vector4( inst, machine, color );
980 }
981 break;
982 case FP_OPCODE_UP2H: /* unpack two 16-bit floats */
983 /* XXX this is probably wrong */
984 {
985 GLfloat a[4], result[4];
986 const GLuint *rawBits = (const GLuint *) a;
987 GLuint *rawResult = (GLuint *) result;
988 fetch_vector1( &inst->SrcReg[0], machine, program, a );
989 rawResult[0] = rawBits[0] & 0xffff;
990 rawResult[1] = (rawBits[0] >> 16) & 0xffff;
991 rawResult[2] = rawBits[0] & 0xffff;
992 rawResult[3] = (rawBits[0] >> 16) & 0xffff;
993 store_vector4( inst, machine, result );
994 }
995 break;
996 case FP_OPCODE_UP2US: /* unpack two GLushorts */
997 {
998 GLfloat a[4], result[4];
999 const GLuint *rawBits = (const GLuint *) a;
1000 fetch_vector1( &inst->SrcReg[0], machine, program, a );
1001 result[0] = (GLfloat) ((rawBits[0] >> 0) & 0xffff) / 65535.0F;
1002 result[1] = (GLfloat) ((rawBits[0] >> 16) & 0xffff) / 65535.0F;
1003 result[2] = result[0];
1004 result[3] = result[1];
1005 store_vector4( inst, machine, result );
1006 }
1007 break;
1008 case FP_OPCODE_UP4B: /* unpack four GLbytes */
1009 {
1010 GLfloat a[4], result[4];
1011 const GLuint *rawBits = (const GLuint *) a;
1012 fetch_vector1( &inst->SrcReg[0], machine, program, a );
1013 result[0] = (((rawBits[0] >> 0) & 0xff) - 128) / 127.0F;
1014 result[0] = (((rawBits[0] >> 8) & 0xff) - 128) / 127.0F;
1015 result[0] = (((rawBits[0] >> 16) & 0xff) - 128) / 127.0F;
1016 result[0] = (((rawBits[0] >> 24) & 0xff) - 128) / 127.0F;
1017 store_vector4( inst, machine, result );
1018 }
1019 break;
1020 case FP_OPCODE_UP4UB: /* unpack four GLubytes */
1021 {
1022 GLfloat a[4], result[4];
1023 const GLuint *rawBits = (const GLuint *) a;
1024 fetch_vector1( &inst->SrcReg[0], machine, program, a );
1025 result[0] = ((rawBits[0] >> 0) & 0xff) / 255.0F;
1026 result[0] = ((rawBits[0] >> 8) & 0xff) / 255.0F;
1027 result[0] = ((rawBits[0] >> 16) & 0xff) / 255.0F;
1028 result[0] = ((rawBits[0] >> 24) & 0xff) / 255.0F;
1029 store_vector4( inst, machine, result );
1030 }
1031 break;
1032 case FP_OPCODE_X2D: /* 2-D matrix transform */
1033 {
1034 GLfloat a[4], b[4], c[4], result[4];
1035 fetch_vector4( &inst->SrcReg[0], machine, program, a );
1036 fetch_vector4( &inst->SrcReg[1], machine, program, b );
1037 fetch_vector4( &inst->SrcReg[2], machine, program, c );
1038 result[0] = a[0] + b[0] * c[0] + b[1] * c[1];
1039 result[1] = a[1] + b[0] * c[2] + b[1] * c[3];
1040 result[2] = a[2] + b[0] * c[0] + b[1] * c[1];
1041 result[3] = a[3] + b[0] * c[2] + b[1] * c[3];
1042 store_vector4( inst, machine, result );
1043 }
1044 break;
1045 case FP_OPCODE_END:
1046 return GL_TRUE;
1047 default:
1048 _mesa_problem(ctx, "Bad opcode %d in _mesa_exec_fragment_program",
1049 inst->Opcode);
1050 return GL_TRUE; /* return value doesn't matter */
1051 }
1052 }
1053 return GL_TRUE;
1054 }
1055
1056
1057 static void
1058 init_machine( GLcontext *ctx, struct fp_machine *machine,
1059 const struct fragment_program *program,
1060 const struct sw_span *span, GLuint col )
1061 {
1062 GLuint j, u;
1063
1064 /* Clear temporary registers */
1065 _mesa_bzero(machine->Registers + FP_TEMP_REG_START,
1066 MAX_NV_FRAGMENT_PROGRAM_TEMPS * 4 * sizeof(GLfloat));
1067
1068 /* Load program local parameters */
1069 for (j = 0; j < MAX_NV_FRAGMENT_PROGRAM_PARAMS; j++) {
1070 COPY_4V(machine->Registers[FP_PROG_REG_START + j],
1071 program->LocalParams[j]);
1072 }
1073
1074 /* Load input registers */
1075 if (program->InputsRead & (1 << FRAG_ATTRIB_WPOS)) {
1076 GLfloat *wpos = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_WPOS];
1077 wpos[0] = span->x + col;
1078 wpos[1] = span->y;
1079 wpos[2] = (GLfloat) span->array->z[col] / ctx->DepthMaxF;
1080 wpos[3] = span->w + col * span->dwdx;
1081 }
1082 if (program->InputsRead & (1 << FRAG_ATTRIB_COL0)) {
1083 GLfloat *col0 = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_COL0];
1084 col0[0] = CHAN_TO_FLOAT(span->array->rgba[col][RCOMP]);
1085 col0[1] = CHAN_TO_FLOAT(span->array->rgba[col][GCOMP]);
1086 col0[2] = CHAN_TO_FLOAT(span->array->rgba[col][BCOMP]);
1087 col0[3] = CHAN_TO_FLOAT(span->array->rgba[col][ACOMP]);
1088 }
1089 if (program->InputsRead & (1 << FRAG_ATTRIB_COL1)) {
1090 GLfloat *col1 = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_COL1];
1091 col1[0] = CHAN_TO_FLOAT(span->array->spec[col][RCOMP]);
1092 col1[1] = CHAN_TO_FLOAT(span->array->spec[col][GCOMP]);
1093 col1[2] = CHAN_TO_FLOAT(span->array->spec[col][BCOMP]);
1094 col1[3] = CHAN_TO_FLOAT(span->array->spec[col][ACOMP]);
1095 }
1096 if (program->InputsRead & (1 << FRAG_ATTRIB_FOGC)) {
1097 GLfloat *fogc = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_FOGC];
1098 fogc[0] = span->array->fog[col];
1099 fogc[1] = 0.0F;
1100 fogc[2] = 0.0F;
1101 fogc[3] = 0.0F;
1102 }
1103 for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
1104 if (program->InputsRead & (1 << (FRAG_ATTRIB_TEX0 + u))) {
1105 GLfloat *tex = machine->Registers[FP_INPUT_REG_START+FRAG_ATTRIB_TEX0+u];
1106 if (ctx->Texture.Unit[u]._ReallyEnabled) {
1107 COPY_4V(tex, span->array->texcoords[u][col]);
1108 }
1109 else {
1110 COPY_4V(tex, ctx->Current.Attrib[VERT_ATTRIB_TEX0 + u]);
1111 }
1112 }
1113 }
1114 }
1115
1116
1117 void
1118 _swrast_exec_nv_fragment_program( GLcontext *ctx, struct sw_span *span )
1119 {
1120 const struct fragment_program *program = ctx->FragmentProgram.Current;
1121 GLuint i;
1122
1123 for (i = 0; i < span->end; i++) {
1124 if (span->array->mask[i]) {
1125 init_machine(ctx, &ctx->FragmentProgram.Machine,
1126 ctx->FragmentProgram.Current, span, i);
1127
1128 if (!execute_program(ctx, program, ~0,
1129 &ctx->FragmentProgram.Machine, span))
1130 span->array->mask[i] = GL_FALSE; /* killed fragment */
1131
1132 /* Store output registers */
1133 {
1134 const GLfloat *colOut
1135 = ctx->FragmentProgram.Machine.Registers[FP_OUTPUT_REG_START];
1136 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][RCOMP], colOut[0]);
1137 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][GCOMP], colOut[1]);
1138 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][BCOMP], colOut[2]);
1139 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][ACOMP], colOut[3]);
1140 }
1141 /* depth value */
1142 if (ctx->FragmentProgram.Current->OutputsWritten & 2)
1143 span->array->z[i] = IROUND(ctx->FragmentProgram.Machine.Registers[FP_OUTPUT_REG_START + 2][0] * ctx->DepthMaxF);
1144 }
1145 }
1146 }
1147