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Move the fp_machine struct into s_nvfragmprog.c since (except for program
[mesa.git] / src / mesa / swrast / s_nvfragprog.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.5.2
4 *
5 * Copyright (C) 1999-2006 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 * Regarding GL_NV_fragment_program:
27 *
28 * Portions of this software may use or implement intellectual
29 * property owned and licensed by NVIDIA Corporation. NVIDIA disclaims
30 * any and all warranties with respect to such intellectual property,
31 * including any use thereof or modifications thereto.
32 */
33
34 #include "glheader.h"
35 #include "colormac.h"
36 #include "context.h"
37 #include "program_instruction.h"
38 #include "program.h"
39
40 #include "s_nvfragprog.h"
41 #include "s_span.h"
42
43
44 /* if 1, print some debugging info */
45 #define DEBUG_FRAG 0
46
47
48 /**
49 * Virtual machine state used during execution of a fragment programs.
50 */
51 struct fp_machine
52 {
53 GLfloat Temporaries[MAX_NV_FRAGMENT_PROGRAM_TEMPS][4];
54 GLfloat Inputs[MAX_NV_FRAGMENT_PROGRAM_INPUTS][4];
55 GLfloat Outputs[MAX_NV_FRAGMENT_PROGRAM_OUTPUTS][4];
56 GLuint CondCodes[4];
57 };
58
59
60 #if FEATURE_MESA_program_debug
61 static struct fp_machine *CurrentMachine = NULL;
62
63 /**
64 * For GL_MESA_program_debug.
65 * Return current value (4*GLfloat) of a fragment program register.
66 * Called via ctx->Driver.GetFragmentProgramRegister().
67 */
68 void
69 _swrast_get_program_register(GLcontext *ctx, enum register_file file,
70 GLuint index, GLfloat val[4])
71 {
72 if (CurrentMachine) {
73 switch (file) {
74 case PROGRAM_INPUT:
75 COPY_4V(val, CurrentMachine->Inputs[index]);
76 break;
77 case PROGRAM_OUTPUT:
78 COPY_4V(val, CurrentMachine->Outputs[index]);
79 break;
80 case PROGRAM_TEMPORARY:
81 COPY_4V(val, CurrentMachine->Temporaries[index]);
82 break;
83 default:
84 _mesa_problem(NULL,
85 "bad register file in _swrast_get_program_register");
86 }
87 }
88 }
89 #endif /* FEATURE_MESA_program_debug */
90
91
92 /**
93 * Fetch a texel.
94 */
95 static void
96 fetch_texel( GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda,
97 GLuint unit, GLfloat color[4] )
98 {
99 GLchan rgba[4];
100 SWcontext *swrast = SWRAST_CONTEXT(ctx);
101
102 /* XXX use a float-valued TextureSample routine here!!! */
103 swrast->TextureSample[unit](ctx, ctx->Texture.Unit[unit]._Current,
104 1, (const GLfloat (*)[4]) texcoord,
105 &lambda, &rgba);
106 color[0] = CHAN_TO_FLOAT(rgba[0]);
107 color[1] = CHAN_TO_FLOAT(rgba[1]);
108 color[2] = CHAN_TO_FLOAT(rgba[2]);
109 color[3] = CHAN_TO_FLOAT(rgba[3]);
110 }
111
112
113 /**
114 * Fetch a texel with the given partial derivatives to compute a level
115 * of detail in the mipmap.
116 */
117 static void
118 fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
119 const GLfloat texdx[4], const GLfloat texdy[4],
120 GLuint unit, GLfloat color[4] )
121 {
122 SWcontext *swrast = SWRAST_CONTEXT(ctx);
123 const struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
124 const struct gl_texture_image *texImg = texObj->Image[0][texObj->BaseLevel];
125 const GLfloat texW = (GLfloat) texImg->WidthScale;
126 const GLfloat texH = (GLfloat) texImg->HeightScale;
127 GLchan rgba[4];
128
129 GLfloat lambda = _swrast_compute_lambda(texdx[0], texdy[0], /* ds/dx, ds/dy */
130 texdx[1], texdy[1], /* dt/dx, dt/dy */
131 texdx[3], texdy[2], /* dq/dx, dq/dy */
132 texW, texH,
133 texcoord[0], texcoord[1], texcoord[3],
134 1.0F / texcoord[3]);
135
136 swrast->TextureSample[unit](ctx, ctx->Texture.Unit[unit]._Current,
137 1, (const GLfloat (*)[4]) texcoord,
138 &lambda, &rgba);
139 color[0] = CHAN_TO_FLOAT(rgba[0]);
140 color[1] = CHAN_TO_FLOAT(rgba[1]);
141 color[2] = CHAN_TO_FLOAT(rgba[2]);
142 color[3] = CHAN_TO_FLOAT(rgba[3]);
143 }
144
145
146 /**
147 * Return a pointer to the 4-element float vector specified by the given
148 * source register.
149 */
150 static INLINE const GLfloat *
151 get_register_pointer( GLcontext *ctx,
152 const struct prog_src_register *source,
153 const struct fp_machine *machine,
154 const struct gl_fragment_program *program )
155 {
156 const GLfloat *src;
157 switch (source->File) {
158 case PROGRAM_TEMPORARY:
159 ASSERT(source->Index < MAX_NV_FRAGMENT_PROGRAM_TEMPS);
160 src = machine->Temporaries[source->Index];
161 break;
162 case PROGRAM_INPUT:
163 ASSERT(source->Index < MAX_NV_FRAGMENT_PROGRAM_INPUTS);
164 src = machine->Inputs[source->Index];
165 break;
166 case PROGRAM_OUTPUT:
167 /* This is only for PRINT */
168 ASSERT(source->Index < MAX_NV_FRAGMENT_PROGRAM_OUTPUTS);
169 src = machine->Outputs[source->Index];
170 break;
171 case PROGRAM_LOCAL_PARAM:
172 ASSERT(source->Index < MAX_PROGRAM_LOCAL_PARAMS);
173 src = program->Base.LocalParams[source->Index];
174 break;
175 case PROGRAM_ENV_PARAM:
176 ASSERT(source->Index < MAX_NV_FRAGMENT_PROGRAM_PARAMS);
177 src = ctx->FragmentProgram.Parameters[source->Index];
178 break;
179 case PROGRAM_STATE_VAR:
180 /* Fallthrough */
181 case PROGRAM_NAMED_PARAM:
182 ASSERT(source->Index < (GLint) program->Base.Parameters->NumParameters);
183 src = program->Base.Parameters->ParameterValues[source->Index];
184 break;
185 default:
186 _mesa_problem(ctx, "Invalid input register file %d in fetch_vector4", source->File);
187 src = NULL;
188 }
189 return src;
190 }
191
192
193 /**
194 * Fetch a 4-element float vector from the given source register.
195 * Apply swizzling and negating as needed.
196 */
197 static void
198 fetch_vector4( GLcontext *ctx,
199 const struct prog_src_register *source,
200 const struct fp_machine *machine,
201 const struct gl_fragment_program *program,
202 GLfloat result[4] )
203 {
204 const GLfloat *src = get_register_pointer(ctx, source, machine, program);
205 ASSERT(src);
206
207 result[0] = src[GET_SWZ(source->Swizzle, 0)];
208 result[1] = src[GET_SWZ(source->Swizzle, 1)];
209 result[2] = src[GET_SWZ(source->Swizzle, 2)];
210 result[3] = src[GET_SWZ(source->Swizzle, 3)];
211
212 if (source->NegateBase) {
213 result[0] = -result[0];
214 result[1] = -result[1];
215 result[2] = -result[2];
216 result[3] = -result[3];
217 }
218 if (source->Abs) {
219 result[0] = FABSF(result[0]);
220 result[1] = FABSF(result[1]);
221 result[2] = FABSF(result[2]);
222 result[3] = FABSF(result[3]);
223 }
224 if (source->NegateAbs) {
225 result[0] = -result[0];
226 result[1] = -result[1];
227 result[2] = -result[2];
228 result[3] = -result[3];
229 }
230 }
231
232
233 /**
234 * Fetch the derivative with respect to X for the given register.
235 * \return GL_TRUE if it was easily computed or GL_FALSE if we
236 * need to execute another instance of the program (ugh)!
237 */
238 static GLboolean
239 fetch_vector4_deriv( GLcontext *ctx,
240 const struct prog_src_register *source,
241 const SWspan *span,
242 char xOrY, GLint column, GLfloat result[4] )
243 {
244 GLfloat src[4];
245
246 ASSERT(xOrY == 'X' || xOrY == 'Y');
247
248 switch (source->Index) {
249 case FRAG_ATTRIB_WPOS:
250 if (xOrY == 'X') {
251 src[0] = 1.0;
252 src[1] = 0.0;
253 src[2] = span->dzdx / ctx->DrawBuffer->_DepthMaxF;
254 src[3] = span->dwdx;
255 }
256 else {
257 src[0] = 0.0;
258 src[1] = 1.0;
259 src[2] = span->dzdy / ctx->DrawBuffer->_DepthMaxF;
260 src[3] = span->dwdy;
261 }
262 break;
263 case FRAG_ATTRIB_COL0:
264 if (xOrY == 'X') {
265 src[0] = span->drdx * (1.0F / CHAN_MAXF);
266 src[1] = span->dgdx * (1.0F / CHAN_MAXF);
267 src[2] = span->dbdx * (1.0F / CHAN_MAXF);
268 src[3] = span->dadx * (1.0F / CHAN_MAXF);
269 }
270 else {
271 src[0] = span->drdy * (1.0F / CHAN_MAXF);
272 src[1] = span->dgdy * (1.0F / CHAN_MAXF);
273 src[2] = span->dbdy * (1.0F / CHAN_MAXF);
274 src[3] = span->dady * (1.0F / CHAN_MAXF);
275 }
276 break;
277 case FRAG_ATTRIB_COL1:
278 if (xOrY == 'X') {
279 src[0] = span->dsrdx * (1.0F / CHAN_MAXF);
280 src[1] = span->dsgdx * (1.0F / CHAN_MAXF);
281 src[2] = span->dsbdx * (1.0F / CHAN_MAXF);
282 src[3] = 0.0; /* XXX need this */
283 }
284 else {
285 src[0] = span->dsrdy * (1.0F / CHAN_MAXF);
286 src[1] = span->dsgdy * (1.0F / CHAN_MAXF);
287 src[2] = span->dsbdy * (1.0F / CHAN_MAXF);
288 src[3] = 0.0; /* XXX need this */
289 }
290 break;
291 case FRAG_ATTRIB_FOGC:
292 if (xOrY == 'X') {
293 src[0] = span->dfogdx;
294 src[1] = 0.0;
295 src[2] = 0.0;
296 src[3] = 0.0;
297 }
298 else {
299 src[0] = span->dfogdy;
300 src[1] = 0.0;
301 src[2] = 0.0;
302 src[3] = 0.0;
303 }
304 break;
305 case FRAG_ATTRIB_TEX0:
306 case FRAG_ATTRIB_TEX1:
307 case FRAG_ATTRIB_TEX2:
308 case FRAG_ATTRIB_TEX3:
309 case FRAG_ATTRIB_TEX4:
310 case FRAG_ATTRIB_TEX5:
311 case FRAG_ATTRIB_TEX6:
312 case FRAG_ATTRIB_TEX7:
313 if (xOrY == 'X') {
314 const GLuint u = source->Index - FRAG_ATTRIB_TEX0;
315 /* this is a little tricky - I think I've got it right */
316 const GLfloat invQ = 1.0f / (span->tex[u][3]
317 + span->texStepX[u][3] * column);
318 src[0] = span->texStepX[u][0] * invQ;
319 src[1] = span->texStepX[u][1] * invQ;
320 src[2] = span->texStepX[u][2] * invQ;
321 src[3] = span->texStepX[u][3] * invQ;
322 }
323 else {
324 const GLuint u = source->Index - FRAG_ATTRIB_TEX0;
325 /* Tricky, as above, but in Y direction */
326 const GLfloat invQ = 1.0f / (span->tex[u][3] + span->texStepY[u][3]);
327 src[0] = span->texStepY[u][0] * invQ;
328 src[1] = span->texStepY[u][1] * invQ;
329 src[2] = span->texStepY[u][2] * invQ;
330 src[3] = span->texStepY[u][3] * invQ;
331 }
332 break;
333 default:
334 return GL_FALSE;
335 }
336
337 result[0] = src[GET_SWZ(source->Swizzle, 0)];
338 result[1] = src[GET_SWZ(source->Swizzle, 1)];
339 result[2] = src[GET_SWZ(source->Swizzle, 2)];
340 result[3] = src[GET_SWZ(source->Swizzle, 3)];
341
342 if (source->NegateBase) {
343 result[0] = -result[0];
344 result[1] = -result[1];
345 result[2] = -result[2];
346 result[3] = -result[3];
347 }
348 if (source->Abs) {
349 result[0] = FABSF(result[0]);
350 result[1] = FABSF(result[1]);
351 result[2] = FABSF(result[2]);
352 result[3] = FABSF(result[3]);
353 }
354 if (source->NegateAbs) {
355 result[0] = -result[0];
356 result[1] = -result[1];
357 result[2] = -result[2];
358 result[3] = -result[3];
359 }
360 return GL_TRUE;
361 }
362
363
364 /**
365 * As above, but only return result[0] element.
366 */
367 static void
368 fetch_vector1( GLcontext *ctx,
369 const struct prog_src_register *source,
370 const struct fp_machine *machine,
371 const struct gl_fragment_program *program,
372 GLfloat result[4] )
373 {
374 const GLfloat *src = get_register_pointer(ctx, source, machine, program);
375 ASSERT(src);
376
377 result[0] = src[GET_SWZ(source->Swizzle, 0)];
378
379 if (source->NegateBase) {
380 result[0] = -result[0];
381 }
382 if (source->Abs) {
383 result[0] = FABSF(result[0]);
384 }
385 if (source->NegateAbs) {
386 result[0] = -result[0];
387 }
388 }
389
390
391 /**
392 * Test value against zero and return GT, LT, EQ or UN if NaN.
393 */
394 static INLINE GLuint
395 generate_cc( float value )
396 {
397 if (value != value)
398 return COND_UN; /* NaN */
399 if (value > 0.0F)
400 return COND_GT;
401 if (value < 0.0F)
402 return COND_LT;
403 return COND_EQ;
404 }
405
406
407 /**
408 * Test if the ccMaskRule is satisfied by the given condition code.
409 * Used to mask destination writes according to the current condition codee.
410 */
411 static INLINE GLboolean
412 test_cc(GLuint condCode, GLuint ccMaskRule)
413 {
414 switch (ccMaskRule) {
415 case COND_EQ: return (condCode == COND_EQ);
416 case COND_NE: return (condCode != COND_EQ);
417 case COND_LT: return (condCode == COND_LT);
418 case COND_GE: return (condCode == COND_GT || condCode == COND_EQ);
419 case COND_LE: return (condCode == COND_LT || condCode == COND_EQ);
420 case COND_GT: return (condCode == COND_GT);
421 case COND_TR: return GL_TRUE;
422 case COND_FL: return GL_FALSE;
423 default: return GL_TRUE;
424 }
425 }
426
427
428 /**
429 * Store 4 floats into a register. Observe the instructions saturate and
430 * set-condition-code flags.
431 */
432 static void
433 store_vector4( const struct prog_instruction *inst,
434 struct fp_machine *machine,
435 const GLfloat value[4] )
436 {
437 const struct prog_dst_register *dest = &(inst->DstReg);
438 const GLboolean clamp = inst->SaturateMode == SATURATE_ZERO_ONE;
439 const GLboolean updateCC = inst->CondUpdate;
440 GLfloat *dstReg;
441 GLfloat dummyReg[4];
442 GLfloat clampedValue[4];
443 GLboolean condWriteMask[4];
444 GLuint writeMask = dest->WriteMask;
445
446 switch (dest->File) {
447 case PROGRAM_OUTPUT:
448 dstReg = machine->Outputs[dest->Index];
449 break;
450 case PROGRAM_TEMPORARY:
451 dstReg = machine->Temporaries[dest->Index];
452 break;
453 case PROGRAM_WRITE_ONLY:
454 dstReg = dummyReg;
455 return;
456 default:
457 _mesa_problem(NULL, "bad register file in store_vector4(fp)");
458 return;
459 }
460
461 #if DEBUG_FRAG
462 if (value[0] > 1.0e10 ||
463 IS_INF_OR_NAN(value[0]) ||
464 IS_INF_OR_NAN(value[1]) ||
465 IS_INF_OR_NAN(value[2]) ||
466 IS_INF_OR_NAN(value[3]) )
467 printf("store %g %g %g %g\n", value[0], value[1], value[2], value[3]);
468 #endif
469
470 if (clamp) {
471 clampedValue[0] = CLAMP(value[0], 0.0F, 1.0F);
472 clampedValue[1] = CLAMP(value[1], 0.0F, 1.0F);
473 clampedValue[2] = CLAMP(value[2], 0.0F, 1.0F);
474 clampedValue[3] = CLAMP(value[3], 0.0F, 1.0F);
475 value = clampedValue;
476 }
477
478 if (dest->CondMask != COND_TR) {
479 condWriteMask[0] = GET_BIT(writeMask, 0)
480 && test_cc(machine->CondCodes[GET_SWZ(dest->CondSwizzle, 0)], dest->CondMask);
481 condWriteMask[1] = GET_BIT(writeMask, 1)
482 && test_cc(machine->CondCodes[GET_SWZ(dest->CondSwizzle, 1)], dest->CondMask);
483 condWriteMask[2] = GET_BIT(writeMask, 2)
484 && test_cc(machine->CondCodes[GET_SWZ(dest->CondSwizzle, 2)], dest->CondMask);
485 condWriteMask[3] = GET_BIT(writeMask, 3)
486 && test_cc(machine->CondCodes[GET_SWZ(dest->CondSwizzle, 3)], dest->CondMask);
487
488 writeMask = ((condWriteMask[0] << 0) |
489 (condWriteMask[1] << 1) |
490 (condWriteMask[2] << 2) |
491 (condWriteMask[3] << 3));
492 }
493
494 if (GET_BIT(writeMask, 0)) {
495 dstReg[0] = value[0];
496 if (updateCC)
497 machine->CondCodes[0] = generate_cc(value[0]);
498 }
499 if (GET_BIT(writeMask, 1)) {
500 dstReg[1] = value[1];
501 if (updateCC)
502 machine->CondCodes[1] = generate_cc(value[1]);
503 }
504 if (GET_BIT(writeMask, 2)) {
505 dstReg[2] = value[2];
506 if (updateCC)
507 machine->CondCodes[2] = generate_cc(value[2]);
508 }
509 if (GET_BIT(writeMask, 3)) {
510 dstReg[3] = value[3];
511 if (updateCC)
512 machine->CondCodes[3] = generate_cc(value[3]);
513 }
514 }
515
516
517 /**
518 * Initialize a new machine state instance from an existing one, adding
519 * the partial derivatives onto the input registers.
520 * Used to implement DDX and DDY instructions in non-trivial cases.
521 */
522 static void
523 init_machine_deriv( GLcontext *ctx,
524 const struct fp_machine *machine,
525 const struct gl_fragment_program *program,
526 const SWspan *span, char xOrY,
527 struct fp_machine *dMachine )
528 {
529 GLuint u;
530
531 ASSERT(xOrY == 'X' || xOrY == 'Y');
532
533 /* copy existing machine */
534 _mesa_memcpy(dMachine, machine, sizeof(struct fp_machine));
535
536 if (program->Base.Target == GL_FRAGMENT_PROGRAM_NV) {
537 /* Clear temporary registers (undefined for ARB_f_p) */
538 _mesa_bzero( (void*) machine->Temporaries,
539 MAX_NV_FRAGMENT_PROGRAM_TEMPS * 4 * sizeof(GLfloat));
540 }
541
542 /* Add derivatives */
543 if (program->Base.InputsRead & (1 << FRAG_ATTRIB_WPOS)) {
544 GLfloat *wpos = (GLfloat*) machine->Inputs[FRAG_ATTRIB_WPOS];
545 if (xOrY == 'X') {
546 wpos[0] += 1.0F;
547 wpos[1] += 0.0F;
548 wpos[2] += span->dzdx;
549 wpos[3] += span->dwdx;
550 }
551 else {
552 wpos[0] += 0.0F;
553 wpos[1] += 1.0F;
554 wpos[2] += span->dzdy;
555 wpos[3] += span->dwdy;
556 }
557 }
558 if (program->Base.InputsRead & (1 << FRAG_ATTRIB_COL0)) {
559 GLfloat *col0 = (GLfloat*) machine->Inputs[FRAG_ATTRIB_COL0];
560 if (xOrY == 'X') {
561 col0[0] += span->drdx * (1.0F / CHAN_MAXF);
562 col0[1] += span->dgdx * (1.0F / CHAN_MAXF);
563 col0[2] += span->dbdx * (1.0F / CHAN_MAXF);
564 col0[3] += span->dadx * (1.0F / CHAN_MAXF);
565 }
566 else {
567 col0[0] += span->drdy * (1.0F / CHAN_MAXF);
568 col0[1] += span->dgdy * (1.0F / CHAN_MAXF);
569 col0[2] += span->dbdy * (1.0F / CHAN_MAXF);
570 col0[3] += span->dady * (1.0F / CHAN_MAXF);
571 }
572 }
573 if (program->Base.InputsRead & (1 << FRAG_ATTRIB_COL1)) {
574 GLfloat *col1 = (GLfloat*) machine->Inputs[FRAG_ATTRIB_COL1];
575 if (xOrY == 'X') {
576 col1[0] += span->dsrdx * (1.0F / CHAN_MAXF);
577 col1[1] += span->dsgdx * (1.0F / CHAN_MAXF);
578 col1[2] += span->dsbdx * (1.0F / CHAN_MAXF);
579 col1[3] += 0.0; /*XXX fix */
580 }
581 else {
582 col1[0] += span->dsrdy * (1.0F / CHAN_MAXF);
583 col1[1] += span->dsgdy * (1.0F / CHAN_MAXF);
584 col1[2] += span->dsbdy * (1.0F / CHAN_MAXF);
585 col1[3] += 0.0; /*XXX fix */
586 }
587 }
588 if (program->Base.InputsRead & (1 << FRAG_ATTRIB_FOGC)) {
589 GLfloat *fogc = (GLfloat*) machine->Inputs[FRAG_ATTRIB_FOGC];
590 if (xOrY == 'X') {
591 fogc[0] += span->dfogdx;
592 }
593 else {
594 fogc[0] += span->dfogdy;
595 }
596 }
597 for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
598 if (program->Base.InputsRead & (1 << (FRAG_ATTRIB_TEX0 + u))) {
599 GLfloat *tex = (GLfloat*) machine->Inputs[FRAG_ATTRIB_TEX0 + u];
600 /* XXX perspective-correct interpolation */
601 if (xOrY == 'X') {
602 tex[0] += span->texStepX[u][0];
603 tex[1] += span->texStepX[u][1];
604 tex[2] += span->texStepX[u][2];
605 tex[3] += span->texStepX[u][3];
606 }
607 else {
608 tex[0] += span->texStepY[u][0];
609 tex[1] += span->texStepY[u][1];
610 tex[2] += span->texStepY[u][2];
611 tex[3] += span->texStepY[u][3];
612 }
613 }
614 }
615
616 /* init condition codes */
617 dMachine->CondCodes[0] = COND_EQ;
618 dMachine->CondCodes[1] = COND_EQ;
619 dMachine->CondCodes[2] = COND_EQ;
620 dMachine->CondCodes[3] = COND_EQ;
621 }
622
623
624 /**
625 * Execute the given vertex program.
626 * NOTE: we do everything in single-precision floating point; we don't
627 * currently observe the single/half/fixed-precision qualifiers.
628 * \param ctx - rendering context
629 * \param program - the fragment program to execute
630 * \param machine - machine state (register file)
631 * \param maxInst - max number of instructions to execute
632 * \return GL_TRUE if program completed or GL_FALSE if program executed KIL.
633 */
634 static GLboolean
635 execute_program( GLcontext *ctx,
636 const struct gl_fragment_program *program, GLuint maxInst,
637 struct fp_machine *machine, const SWspan *span,
638 GLuint column )
639 {
640 GLuint pc;
641
642 #if DEBUG_FRAG
643 printf("execute fragment program --------------------\n");
644 #endif
645
646 for (pc = 0; pc < maxInst; pc++) {
647 const struct prog_instruction *inst = program->Base.Instructions + pc;
648
649 if (ctx->FragmentProgram.CallbackEnabled &&
650 ctx->FragmentProgram.Callback) {
651 ctx->FragmentProgram.CurrentPosition = inst->StringPos;
652 ctx->FragmentProgram.Callback(program->Base.Target,
653 ctx->FragmentProgram.CallbackData);
654 }
655
656 switch (inst->Opcode) {
657 case OPCODE_ABS:
658 {
659 GLfloat a[4], result[4];
660 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
661 result[0] = FABSF(a[0]);
662 result[1] = FABSF(a[1]);
663 result[2] = FABSF(a[2]);
664 result[3] = FABSF(a[3]);
665 store_vector4( inst, machine, result );
666 }
667 break;
668 case OPCODE_ADD:
669 {
670 GLfloat a[4], b[4], result[4];
671 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
672 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
673 result[0] = a[0] + b[0];
674 result[1] = a[1] + b[1];
675 result[2] = a[2] + b[2];
676 result[3] = a[3] + b[3];
677 store_vector4( inst, machine, result );
678 }
679 break;
680 case OPCODE_CMP:
681 {
682 GLfloat a[4], b[4], c[4], result[4];
683 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
684 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
685 fetch_vector4( ctx, &inst->SrcReg[2], machine, program, c );
686 result[0] = a[0] < 0.0F ? b[0] : c[0];
687 result[1] = a[1] < 0.0F ? b[1] : c[1];
688 result[2] = a[2] < 0.0F ? b[2] : c[2];
689 result[3] = a[3] < 0.0F ? b[3] : c[3];
690 store_vector4( inst, machine, result );
691 }
692 break;
693 case OPCODE_COS:
694 {
695 GLfloat a[4], result[4];
696 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
697 result[0] = result[1] = result[2] = result[3] = (GLfloat)_mesa_cos(a[0]);
698 store_vector4( inst, machine, result );
699 }
700 break;
701 case OPCODE_DDX: /* Partial derivative with respect to X */
702 {
703 GLfloat a[4], aNext[4], result[4];
704 struct fp_machine dMachine;
705 if (!fetch_vector4_deriv(ctx, &inst->SrcReg[0], span, 'X',
706 column, result)) {
707 /* This is tricky. Make a copy of the current machine state,
708 * increment the input registers by the dx or dy partial
709 * derivatives, then re-execute the program up to the
710 * preceeding instruction, then fetch the source register.
711 * Finally, find the difference in the register values for
712 * the original and derivative runs.
713 */
714 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a);
715 init_machine_deriv(ctx, machine, program, span,
716 'X', &dMachine);
717 execute_program(ctx, program, pc, &dMachine, span, column);
718 fetch_vector4( ctx, &inst->SrcReg[0], &dMachine, program, aNext );
719 result[0] = aNext[0] - a[0];
720 result[1] = aNext[1] - a[1];
721 result[2] = aNext[2] - a[2];
722 result[3] = aNext[3] - a[3];
723 }
724 store_vector4( inst, machine, result );
725 }
726 break;
727 case OPCODE_DDY: /* Partial derivative with respect to Y */
728 {
729 GLfloat a[4], aNext[4], result[4];
730 struct fp_machine dMachine;
731 if (!fetch_vector4_deriv(ctx, &inst->SrcReg[0], span, 'Y',
732 column, result)) {
733 init_machine_deriv(ctx, machine, program, span,
734 'Y', &dMachine);
735 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a);
736 execute_program(ctx, program, pc, &dMachine, span, column);
737 fetch_vector4( ctx, &inst->SrcReg[0], &dMachine, program, aNext );
738 result[0] = aNext[0] - a[0];
739 result[1] = aNext[1] - a[1];
740 result[2] = aNext[2] - a[2];
741 result[3] = aNext[3] - a[3];
742 }
743 store_vector4( inst, machine, result );
744 }
745 break;
746 case OPCODE_DP3:
747 {
748 GLfloat a[4], b[4], result[4];
749 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
750 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
751 result[0] = result[1] = result[2] = result[3] =
752 a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
753 store_vector4( inst, machine, result );
754 #if DEBUG_FRAG
755 printf("DP3 %g = (%g %g %g) . (%g %g %g)\n",
756 result[0], a[0], a[1], a[2], b[0], b[1], b[2]);
757 #endif
758 }
759 break;
760 case OPCODE_DP4:
761 {
762 GLfloat a[4], b[4], result[4];
763 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
764 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
765 result[0] = result[1] = result[2] = result[3] =
766 a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
767 store_vector4( inst, machine, result );
768 #if DEBUG_FRAG
769 printf("DP4 %g = (%g, %g %g %g) . (%g, %g %g %g)\n",
770 result[0], a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);
771 #endif
772 }
773 break;
774 case OPCODE_DPH:
775 {
776 GLfloat a[4], b[4], result[4];
777 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
778 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
779 result[0] = result[1] = result[2] = result[3] =
780 a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + b[3];
781 store_vector4( inst, machine, result );
782 }
783 break;
784 case OPCODE_DST: /* Distance vector */
785 {
786 GLfloat a[4], b[4], result[4];
787 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
788 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
789 result[0] = 1.0F;
790 result[1] = a[1] * b[1];
791 result[2] = a[2];
792 result[3] = b[3];
793 store_vector4( inst, machine, result );
794 }
795 break;
796 case OPCODE_EX2: /* Exponential base 2 */
797 {
798 GLfloat a[4], result[4];
799 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
800 result[0] = result[1] = result[2] = result[3] =
801 (GLfloat) _mesa_pow(2.0, a[0]);
802 store_vector4( inst, machine, result );
803 }
804 break;
805 case OPCODE_FLR:
806 {
807 GLfloat a[4], result[4];
808 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
809 result[0] = FLOORF(a[0]);
810 result[1] = FLOORF(a[1]);
811 result[2] = FLOORF(a[2]);
812 result[3] = FLOORF(a[3]);
813 store_vector4( inst, machine, result );
814 }
815 break;
816 case OPCODE_FRC:
817 {
818 GLfloat a[4], result[4];
819 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
820 result[0] = a[0] - FLOORF(a[0]);
821 result[1] = a[1] - FLOORF(a[1]);
822 result[2] = a[2] - FLOORF(a[2]);
823 result[3] = a[3] - FLOORF(a[3]);
824 store_vector4( inst, machine, result );
825 }
826 break;
827 case OPCODE_KIL_NV: /* NV_f_p only */
828 {
829 const GLuint swizzle = inst->DstReg.CondSwizzle;
830 const GLuint condMask = inst->DstReg.CondMask;
831 if (test_cc(machine->CondCodes[GET_SWZ(swizzle, 0)], condMask) ||
832 test_cc(machine->CondCodes[GET_SWZ(swizzle, 1)], condMask) ||
833 test_cc(machine->CondCodes[GET_SWZ(swizzle, 2)], condMask) ||
834 test_cc(machine->CondCodes[GET_SWZ(swizzle, 3)], condMask)) {
835 return GL_FALSE;
836 }
837 }
838 break;
839 case OPCODE_KIL: /* ARB_f_p only */
840 {
841 GLfloat a[4];
842 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
843 if (a[0] < 0.0F || a[1] < 0.0F || a[2] < 0.0F || a[3] < 0.0F) {
844 return GL_FALSE;
845 }
846 }
847 break;
848 case OPCODE_LG2: /* log base 2 */
849 {
850 GLfloat a[4], result[4];
851 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
852 result[0] = result[1] = result[2] = result[3]
853 = LOG2(a[0]);
854 store_vector4( inst, machine, result );
855 }
856 break;
857 case OPCODE_LIT:
858 {
859 const GLfloat epsilon = 1.0F / 256.0F; /* from NV VP spec */
860 GLfloat a[4], result[4];
861 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
862 a[0] = MAX2(a[0], 0.0F);
863 a[1] = MAX2(a[1], 0.0F);
864 /* XXX ARB version clamps a[3], NV version doesn't */
865 a[3] = CLAMP(a[3], -(128.0F - epsilon), (128.0F - epsilon));
866 result[0] = 1.0F;
867 result[1] = a[0];
868 /* XXX we could probably just use pow() here */
869 if (a[0] > 0.0F) {
870 if (a[1] == 0.0 && a[3] == 0.0)
871 result[2] = 1.0;
872 else
873 result[2] = EXPF(a[3] * LOGF(a[1]));
874 }
875 else {
876 result[2] = 0.0;
877 }
878 result[3] = 1.0F;
879 store_vector4( inst, machine, result );
880 }
881 break;
882 case OPCODE_LRP:
883 {
884 GLfloat a[4], b[4], c[4], result[4];
885 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
886 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
887 fetch_vector4( ctx, &inst->SrcReg[2], machine, program, c );
888 result[0] = a[0] * b[0] + (1.0F - a[0]) * c[0];
889 result[1] = a[1] * b[1] + (1.0F - a[1]) * c[1];
890 result[2] = a[2] * b[2] + (1.0F - a[2]) * c[2];
891 result[3] = a[3] * b[3] + (1.0F - a[3]) * c[3];
892 store_vector4( inst, machine, result );
893 }
894 break;
895 case OPCODE_MAD:
896 {
897 GLfloat a[4], b[4], c[4], result[4];
898 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
899 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
900 fetch_vector4( ctx, &inst->SrcReg[2], machine, program, c );
901 result[0] = a[0] * b[0] + c[0];
902 result[1] = a[1] * b[1] + c[1];
903 result[2] = a[2] * b[2] + c[2];
904 result[3] = a[3] * b[3] + c[3];
905 store_vector4( inst, machine, result );
906 }
907 break;
908 case OPCODE_MAX:
909 {
910 GLfloat a[4], b[4], result[4];
911 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
912 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
913 result[0] = MAX2(a[0], b[0]);
914 result[1] = MAX2(a[1], b[1]);
915 result[2] = MAX2(a[2], b[2]);
916 result[3] = MAX2(a[3], b[3]);
917 store_vector4( inst, machine, result );
918 #if DEBUG_FRAG
919 printf("MAX (%g %g %g %g) = (%g %g %g %g), (%g %g %g %g)\n",
920 result[0], result[1], result[2], result[3],
921 a[0], a[1], a[2], a[3],
922 b[0], b[1], b[2], b[3]);
923 #endif
924 }
925 break;
926 case OPCODE_MIN:
927 {
928 GLfloat a[4], b[4], result[4];
929 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
930 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
931 result[0] = MIN2(a[0], b[0]);
932 result[1] = MIN2(a[1], b[1]);
933 result[2] = MIN2(a[2], b[2]);
934 result[3] = MIN2(a[3], b[3]);
935 store_vector4( inst, machine, result );
936 }
937 break;
938 case OPCODE_MOV:
939 {
940 GLfloat result[4];
941 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, result );
942 store_vector4( inst, machine, result );
943 #if DEBUG_FRAG
944 printf("MOV (%g %g %g %g)\n",
945 result[0], result[1], result[2], result[3]);
946 #endif
947 }
948 break;
949 case OPCODE_MUL:
950 {
951 GLfloat a[4], b[4], result[4];
952 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
953 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
954 result[0] = a[0] * b[0];
955 result[1] = a[1] * b[1];
956 result[2] = a[2] * b[2];
957 result[3] = a[3] * b[3];
958 store_vector4( inst, machine, result );
959 #if DEBUG_FRAG
960 printf("MUL (%g %g %g %g) = (%g %g %g %g) * (%g %g %g %g)\n",
961 result[0], result[1], result[2], result[3],
962 a[0], a[1], a[2], a[3],
963 b[0], b[1], b[2], b[3]);
964 #endif
965 }
966 break;
967 case OPCODE_PK2H: /* pack two 16-bit floats in one 32-bit float */
968 {
969 GLfloat a[4], result[4];
970 GLhalfNV hx, hy;
971 GLuint *rawResult = (GLuint *) result;
972 GLuint twoHalves;
973 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
974 hx = _mesa_float_to_half(a[0]);
975 hy = _mesa_float_to_half(a[1]);
976 twoHalves = hx | (hy << 16);
977 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
978 = twoHalves;
979 store_vector4( inst, machine, result );
980 }
981 break;
982 case OPCODE_PK2US: /* pack two GLushorts into one 32-bit float */
983 {
984 GLfloat a[4], result[4];
985 GLuint usx, usy, *rawResult = (GLuint *) result;
986 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
987 a[0] = CLAMP(a[0], 0.0F, 1.0F);
988 a[1] = CLAMP(a[1], 0.0F, 1.0F);
989 usx = IROUND(a[0] * 65535.0F);
990 usy = IROUND(a[1] * 65535.0F);
991 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
992 = usx | (usy << 16);
993 store_vector4( inst, machine, result );
994 }
995 break;
996 case OPCODE_PK4B: /* pack four GLbytes into one 32-bit float */
997 {
998 GLfloat a[4], result[4];
999 GLuint ubx, uby, ubz, ubw, *rawResult = (GLuint *) result;
1000 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1001 a[0] = CLAMP(a[0], -128.0F / 127.0F, 1.0F);
1002 a[1] = CLAMP(a[1], -128.0F / 127.0F, 1.0F);
1003 a[2] = CLAMP(a[2], -128.0F / 127.0F, 1.0F);
1004 a[3] = CLAMP(a[3], -128.0F / 127.0F, 1.0F);
1005 ubx = IROUND(127.0F * a[0] + 128.0F);
1006 uby = IROUND(127.0F * a[1] + 128.0F);
1007 ubz = IROUND(127.0F * a[2] + 128.0F);
1008 ubw = IROUND(127.0F * a[3] + 128.0F);
1009 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
1010 = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
1011 store_vector4( inst, machine, result );
1012 }
1013 break;
1014 case OPCODE_PK4UB: /* pack four GLubytes into one 32-bit float */
1015 {
1016 GLfloat a[4], result[4];
1017 GLuint ubx, uby, ubz, ubw, *rawResult = (GLuint *) result;
1018 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1019 a[0] = CLAMP(a[0], 0.0F, 1.0F);
1020 a[1] = CLAMP(a[1], 0.0F, 1.0F);
1021 a[2] = CLAMP(a[2], 0.0F, 1.0F);
1022 a[3] = CLAMP(a[3], 0.0F, 1.0F);
1023 ubx = IROUND(255.0F * a[0]);
1024 uby = IROUND(255.0F * a[1]);
1025 ubz = IROUND(255.0F * a[2]);
1026 ubw = IROUND(255.0F * a[3]);
1027 rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
1028 = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
1029 store_vector4( inst, machine, result );
1030 }
1031 break;
1032 case OPCODE_POW:
1033 {
1034 GLfloat a[4], b[4], result[4];
1035 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1036 fetch_vector1( ctx, &inst->SrcReg[1], machine, program, b );
1037 result[0] = result[1] = result[2] = result[3]
1038 = (GLfloat)_mesa_pow(a[0], b[0]);
1039 store_vector4( inst, machine, result );
1040 }
1041 break;
1042 case OPCODE_RCP:
1043 {
1044 GLfloat a[4], result[4];
1045 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1046 #if DEBUG_FRAG
1047 if (a[0] == 0)
1048 printf("RCP(0)\n");
1049 else if (IS_INF_OR_NAN(a[0]))
1050 printf("RCP(inf)\n");
1051 #endif
1052 result[0] = result[1] = result[2] = result[3]
1053 = 1.0F / a[0];
1054 store_vector4( inst, machine, result );
1055 }
1056 break;
1057 case OPCODE_RFL:
1058 {
1059 GLfloat axis[4], dir[4], result[4], tmp[4];
1060 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, axis );
1061 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, dir );
1062 tmp[3] = axis[0] * axis[0]
1063 + axis[1] * axis[1]
1064 + axis[2] * axis[2];
1065 tmp[0] = (2.0F * (axis[0] * dir[0] +
1066 axis[1] * dir[1] +
1067 axis[2] * dir[2])) / tmp[3];
1068 result[0] = tmp[0] * axis[0] - dir[0];
1069 result[1] = tmp[0] * axis[1] - dir[1];
1070 result[2] = tmp[0] * axis[2] - dir[2];
1071 /* result[3] is never written! XXX enforce in parser! */
1072 store_vector4( inst, machine, result );
1073 }
1074 break;
1075 case OPCODE_RSQ: /* 1 / sqrt() */
1076 {
1077 GLfloat a[4], result[4];
1078 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1079 a[0] = FABSF(a[0]);
1080 result[0] = result[1] = result[2] = result[3] = INV_SQRTF(a[0]);
1081 store_vector4( inst, machine, result );
1082 #if DEBUG_FRAG
1083 printf("RSQ %g = 1/sqrt(|%g|)\n", result[0], a[0]);
1084 #endif
1085 }
1086 break;
1087 case OPCODE_SCS: /* sine and cos */
1088 {
1089 GLfloat a[4], result[4];
1090 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1091 result[0] = (GLfloat)_mesa_cos(a[0]);
1092 result[1] = (GLfloat)_mesa_sin(a[0]);
1093 result[2] = 0.0; /* undefined! */
1094 result[3] = 0.0; /* undefined! */
1095 store_vector4( inst, machine, result );
1096 }
1097 break;
1098 case OPCODE_SEQ: /* set on equal */
1099 {
1100 GLfloat a[4], b[4], result[4];
1101 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1102 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1103 result[0] = (a[0] == b[0]) ? 1.0F : 0.0F;
1104 result[1] = (a[1] == b[1]) ? 1.0F : 0.0F;
1105 result[2] = (a[2] == b[2]) ? 1.0F : 0.0F;
1106 result[3] = (a[3] == b[3]) ? 1.0F : 0.0F;
1107 store_vector4( inst, machine, result );
1108 }
1109 break;
1110 case OPCODE_SFL: /* set false, operands ignored */
1111 {
1112 static const GLfloat result[4] = { 0.0F, 0.0F, 0.0F, 0.0F };
1113 store_vector4( inst, machine, result );
1114 }
1115 break;
1116 case OPCODE_SGE: /* set on greater or equal */
1117 {
1118 GLfloat a[4], b[4], result[4];
1119 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1120 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1121 result[0] = (a[0] >= b[0]) ? 1.0F : 0.0F;
1122 result[1] = (a[1] >= b[1]) ? 1.0F : 0.0F;
1123 result[2] = (a[2] >= b[2]) ? 1.0F : 0.0F;
1124 result[3] = (a[3] >= b[3]) ? 1.0F : 0.0F;
1125 store_vector4( inst, machine, result );
1126 }
1127 break;
1128 case OPCODE_SGT: /* set on greater */
1129 {
1130 GLfloat a[4], b[4], result[4];
1131 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1132 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1133 result[0] = (a[0] > b[0]) ? 1.0F : 0.0F;
1134 result[1] = (a[1] > b[1]) ? 1.0F : 0.0F;
1135 result[2] = (a[2] > b[2]) ? 1.0F : 0.0F;
1136 result[3] = (a[3] > b[3]) ? 1.0F : 0.0F;
1137 store_vector4( inst, machine, result );
1138 }
1139 break;
1140 case OPCODE_SIN:
1141 {
1142 GLfloat a[4], result[4];
1143 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1144 result[0] = result[1] = result[2] =
1145 result[3] = (GLfloat)_mesa_sin(a[0]);
1146 store_vector4( inst, machine, result );
1147 }
1148 break;
1149 case OPCODE_SLE: /* set on less or equal */
1150 {
1151 GLfloat a[4], b[4], result[4];
1152 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1153 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1154 result[0] = (a[0] <= b[0]) ? 1.0F : 0.0F;
1155 result[1] = (a[1] <= b[1]) ? 1.0F : 0.0F;
1156 result[2] = (a[2] <= b[2]) ? 1.0F : 0.0F;
1157 result[3] = (a[3] <= b[3]) ? 1.0F : 0.0F;
1158 store_vector4( inst, machine, result );
1159 }
1160 break;
1161 case OPCODE_SLT: /* set on less */
1162 {
1163 GLfloat a[4], b[4], result[4];
1164 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1165 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1166 result[0] = (a[0] < b[0]) ? 1.0F : 0.0F;
1167 result[1] = (a[1] < b[1]) ? 1.0F : 0.0F;
1168 result[2] = (a[2] < b[2]) ? 1.0F : 0.0F;
1169 result[3] = (a[3] < b[3]) ? 1.0F : 0.0F;
1170 store_vector4( inst, machine, result );
1171 }
1172 break;
1173 case OPCODE_SNE: /* set on not equal */
1174 {
1175 GLfloat a[4], b[4], result[4];
1176 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1177 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1178 result[0] = (a[0] != b[0]) ? 1.0F : 0.0F;
1179 result[1] = (a[1] != b[1]) ? 1.0F : 0.0F;
1180 result[2] = (a[2] != b[2]) ? 1.0F : 0.0F;
1181 result[3] = (a[3] != b[3]) ? 1.0F : 0.0F;
1182 store_vector4( inst, machine, result );
1183 }
1184 break;
1185 case OPCODE_STR: /* set true, operands ignored */
1186 {
1187 static const GLfloat result[4] = { 1.0F, 1.0F, 1.0F, 1.0F };
1188 store_vector4( inst, machine, result );
1189 }
1190 break;
1191 case OPCODE_SUB:
1192 {
1193 GLfloat a[4], b[4], result[4];
1194 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1195 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1196 result[0] = a[0] - b[0];
1197 result[1] = a[1] - b[1];
1198 result[2] = a[2] - b[2];
1199 result[3] = a[3] - b[3];
1200 store_vector4( inst, machine, result );
1201 }
1202 break;
1203 case OPCODE_SWZ:
1204 {
1205 const struct prog_src_register *source = &inst->SrcReg[0];
1206 const GLfloat *src = get_register_pointer(ctx, source,
1207 machine, program);
1208 GLfloat result[4];
1209 GLuint i;
1210
1211 /* do extended swizzling here */
1212 for (i = 0; i < 4; i++) {
1213 if (GET_SWZ(source->Swizzle, i) == SWIZZLE_ZERO)
1214 result[i] = 0.0;
1215 else if (GET_SWZ(source->Swizzle, i) == SWIZZLE_ONE)
1216 result[i] = 1.0;
1217 else
1218 result[i] = src[GET_SWZ(source->Swizzle, i)];
1219
1220 if (source->NegateBase & (1 << i))
1221 result[i] = -result[i];
1222 }
1223 store_vector4( inst, machine, result );
1224 }
1225 break;
1226 case OPCODE_TEX: /* Both ARB and NV frag prog */
1227 /* Texel lookup */
1228 {
1229 GLfloat texcoord[4], color[4];
1230 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, texcoord );
1231 /* Note: we pass 0 for LOD. The ARB extension requires it
1232 * while the NV extension says it's implementation dependant.
1233 */
1234 /* KW: Previously lambda was passed as zero, but I
1235 * believe this is incorrect, the spec seems to
1236 * indicate rather that lambda should not be
1237 * changed/biased, unlike TXB where texcoord[3] is
1238 * added to the lambda calculations. The lambda should
1239 * still be calculated normally for TEX & TXP though,
1240 * not set to zero. Otherwise it's very difficult to
1241 * implement normal GL semantics through the fragment
1242 * shader.
1243 */
1244 fetch_texel( ctx, texcoord,
1245 span->array->lambda[inst->TexSrcUnit][column],
1246 inst->TexSrcUnit, color );
1247 #if DEBUG_FRAG
1248 if (color[3])
1249 printf("color[3] = %f\n", color[3]);
1250 #endif
1251 store_vector4( inst, machine, color );
1252 }
1253 break;
1254 case OPCODE_TXB: /* GL_ARB_fragment_program only */
1255 /* Texel lookup with LOD bias */
1256 {
1257 GLfloat texcoord[4], color[4], bias, lambda;
1258
1259 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, texcoord );
1260 /* texcoord[3] is the bias to add to lambda */
1261 bias = ctx->Texture.Unit[inst->TexSrcUnit].LodBias
1262 + ctx->Texture.Unit[inst->TexSrcUnit]._Current->LodBias
1263 + texcoord[3];
1264 lambda = span->array->lambda[inst->TexSrcUnit][column] + bias;
1265 fetch_texel( ctx, texcoord, lambda,
1266 inst->TexSrcUnit, color );
1267 store_vector4( inst, machine, color );
1268 }
1269 break;
1270 case OPCODE_TXD: /* GL_NV_fragment_program only */
1271 /* Texture lookup w/ partial derivatives for LOD */
1272 {
1273 GLfloat texcoord[4], dtdx[4], dtdy[4], color[4];
1274 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, texcoord );
1275 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, dtdx );
1276 fetch_vector4( ctx, &inst->SrcReg[2], machine, program, dtdy );
1277 fetch_texel_deriv( ctx, texcoord, dtdx, dtdy, inst->TexSrcUnit,
1278 color );
1279 store_vector4( inst, machine, color );
1280 }
1281 break;
1282 case OPCODE_TXP: /* GL_ARB_fragment_program only */
1283 /* Texture lookup w/ projective divide */
1284 {
1285 GLfloat texcoord[4], color[4];
1286 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, texcoord );
1287 /* Not so sure about this test - if texcoord[3] is
1288 * zero, we'd probably be fine except for an ASSERT in
1289 * IROUND_POS() which gets triggered by the inf values created.
1290 */
1291 if (texcoord[3] != 0.0) {
1292 texcoord[0] /= texcoord[3];
1293 texcoord[1] /= texcoord[3];
1294 texcoord[2] /= texcoord[3];
1295 }
1296 /* KW: Previously lambda was passed as zero, but I
1297 * believe this is incorrect, the spec seems to
1298 * indicate rather that lambda should not be
1299 * changed/biased, unlike TXB where texcoord[3] is
1300 * added to the lambda calculations. The lambda should
1301 * still be calculated normally for TEX & TXP though,
1302 * not set to zero.
1303 */
1304 fetch_texel( ctx, texcoord,
1305 span->array->lambda[inst->TexSrcUnit][column],
1306 inst->TexSrcUnit, color );
1307 store_vector4( inst, machine, color );
1308 }
1309 break;
1310 case OPCODE_TXP_NV: /* GL_NV_fragment_program only */
1311 /* Texture lookup w/ projective divide */
1312 {
1313 GLfloat texcoord[4], color[4];
1314 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, texcoord );
1315 if (inst->TexSrcTarget != TEXTURE_CUBE_INDEX &&
1316 texcoord[3] != 0.0) {
1317 texcoord[0] /= texcoord[3];
1318 texcoord[1] /= texcoord[3];
1319 texcoord[2] /= texcoord[3];
1320 }
1321 fetch_texel( ctx, texcoord,
1322 span->array->lambda[inst->TexSrcUnit][column],
1323 inst->TexSrcUnit, color );
1324 store_vector4( inst, machine, color );
1325 }
1326 break;
1327 case OPCODE_UP2H: /* unpack two 16-bit floats */
1328 {
1329 GLfloat a[4], result[4];
1330 const GLuint *rawBits = (const GLuint *) a;
1331 GLhalfNV hx, hy;
1332 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1333 hx = rawBits[0] & 0xffff;
1334 hy = rawBits[0] >> 16;
1335 result[0] = result[2] = _mesa_half_to_float(hx);
1336 result[1] = result[3] = _mesa_half_to_float(hy);
1337 store_vector4( inst, machine, result );
1338 }
1339 break;
1340 case OPCODE_UP2US: /* unpack two GLushorts */
1341 {
1342 GLfloat a[4], result[4];
1343 const GLuint *rawBits = (const GLuint *) a;
1344 GLushort usx, usy;
1345 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1346 usx = rawBits[0] & 0xffff;
1347 usy = rawBits[0] >> 16;
1348 result[0] = result[2] = usx * (1.0f / 65535.0f);
1349 result[1] = result[3] = usy * (1.0f / 65535.0f);
1350 store_vector4( inst, machine, result );
1351 }
1352 break;
1353 case OPCODE_UP4B: /* unpack four GLbytes */
1354 {
1355 GLfloat a[4], result[4];
1356 const GLuint *rawBits = (const GLuint *) a;
1357 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1358 result[0] = (((rawBits[0] >> 0) & 0xff) - 128) / 127.0F;
1359 result[1] = (((rawBits[0] >> 8) & 0xff) - 128) / 127.0F;
1360 result[2] = (((rawBits[0] >> 16) & 0xff) - 128) / 127.0F;
1361 result[3] = (((rawBits[0] >> 24) & 0xff) - 128) / 127.0F;
1362 store_vector4( inst, machine, result );
1363 }
1364 break;
1365 case OPCODE_UP4UB: /* unpack four GLubytes */
1366 {
1367 GLfloat a[4], result[4];
1368 const GLuint *rawBits = (const GLuint *) a;
1369 fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
1370 result[0] = ((rawBits[0] >> 0) & 0xff) / 255.0F;
1371 result[1] = ((rawBits[0] >> 8) & 0xff) / 255.0F;
1372 result[2] = ((rawBits[0] >> 16) & 0xff) / 255.0F;
1373 result[3] = ((rawBits[0] >> 24) & 0xff) / 255.0F;
1374 store_vector4( inst, machine, result );
1375 }
1376 break;
1377 case OPCODE_XPD: /* cross product */
1378 {
1379 GLfloat a[4], b[4], result[4];
1380 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1381 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1382 result[0] = a[1] * b[2] - a[2] * b[1];
1383 result[1] = a[2] * b[0] - a[0] * b[2];
1384 result[2] = a[0] * b[1] - a[1] * b[0];
1385 result[3] = 1.0;
1386 store_vector4( inst, machine, result );
1387 }
1388 break;
1389 case OPCODE_X2D: /* 2-D matrix transform */
1390 {
1391 GLfloat a[4], b[4], c[4], result[4];
1392 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
1393 fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
1394 fetch_vector4( ctx, &inst->SrcReg[2], machine, program, c );
1395 result[0] = a[0] + b[0] * c[0] + b[1] * c[1];
1396 result[1] = a[1] + b[0] * c[2] + b[1] * c[3];
1397 result[2] = a[2] + b[0] * c[0] + b[1] * c[1];
1398 result[3] = a[3] + b[0] * c[2] + b[1] * c[3];
1399 store_vector4( inst, machine, result );
1400 }
1401 break;
1402 case OPCODE_PRINT:
1403 {
1404 if (inst->SrcReg[0].File != -1) {
1405 GLfloat a[4];
1406 fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a);
1407 _mesa_printf("%s%g, %g, %g, %g\n", (const char *) inst->Data,
1408 a[0], a[1], a[2], a[3]);
1409 }
1410 else {
1411 _mesa_printf("%s\n", (const char *) inst->Data);
1412 }
1413 }
1414 break;
1415 case OPCODE_END:
1416 return GL_TRUE;
1417 default:
1418 _mesa_problem(ctx, "Bad opcode %d in _mesa_exec_fragment_program",
1419 inst->Opcode);
1420 return GL_TRUE; /* return value doesn't matter */
1421 }
1422 }
1423 return GL_TRUE;
1424 }
1425
1426
1427 /**
1428 * Initialize the virtual fragment program machine state prior to running
1429 * fragment program on a fragment. This involves initializing the input
1430 * registers, condition codes, etc.
1431 * \param machine the virtual machine state to init
1432 * \param program the fragment program we're about to run
1433 * \param span the span of pixels we'll operate on
1434 * \param col which element (column) of the span we'll operate on
1435 */
1436 static void
1437 init_machine( GLcontext *ctx, struct fp_machine *machine,
1438 const struct gl_fragment_program *program,
1439 const SWspan *span, GLuint col )
1440 {
1441 GLuint inputsRead = program->Base.InputsRead;
1442 GLuint u;
1443
1444 if (ctx->FragmentProgram.CallbackEnabled)
1445 inputsRead = ~0;
1446
1447 if (program->Base.Target == GL_FRAGMENT_PROGRAM_NV) {
1448 /* Clear temporary registers (undefined for ARB_f_p) */
1449 _mesa_bzero(machine->Temporaries,
1450 MAX_NV_FRAGMENT_PROGRAM_TEMPS * 4 * sizeof(GLfloat));
1451 }
1452
1453 /* Load input registers */
1454 if (inputsRead & (1 << FRAG_ATTRIB_WPOS)) {
1455 GLfloat *wpos = machine->Inputs[FRAG_ATTRIB_WPOS];
1456 ASSERT(span->arrayMask & SPAN_Z);
1457 if (span->arrayMask & SPAN_XY) {
1458 wpos[0] = (GLfloat) span->array->x[col];
1459 wpos[1] = (GLfloat) span->array->y[col];
1460 }
1461 else {
1462 wpos[0] = (GLfloat) span->x + col;
1463 wpos[1] = (GLfloat) span->y;
1464 }
1465 wpos[2] = (GLfloat) span->array->z[col] / ctx->DrawBuffer->_DepthMaxF;
1466 wpos[3] = span->w + col * span->dwdx;
1467 }
1468 if (inputsRead & (1 << FRAG_ATTRIB_COL0)) {
1469 GLfloat *col0 = machine->Inputs[FRAG_ATTRIB_COL0];
1470 ASSERT(span->arrayMask & SPAN_RGBA);
1471 col0[0] = CHAN_TO_FLOAT(span->array->rgba[col][RCOMP]);
1472 col0[1] = CHAN_TO_FLOAT(span->array->rgba[col][GCOMP]);
1473 col0[2] = CHAN_TO_FLOAT(span->array->rgba[col][BCOMP]);
1474 col0[3] = CHAN_TO_FLOAT(span->array->rgba[col][ACOMP]);
1475 }
1476 if (inputsRead & (1 << FRAG_ATTRIB_COL1)) {
1477 GLfloat *col1 = machine->Inputs[FRAG_ATTRIB_COL1];
1478 col1[0] = CHAN_TO_FLOAT(span->array->spec[col][RCOMP]);
1479 col1[1] = CHAN_TO_FLOAT(span->array->spec[col][GCOMP]);
1480 col1[2] = CHAN_TO_FLOAT(span->array->spec[col][BCOMP]);
1481 col1[3] = CHAN_TO_FLOAT(span->array->spec[col][ACOMP]);
1482 }
1483 if (inputsRead & (1 << FRAG_ATTRIB_FOGC)) {
1484 GLfloat *fogc = machine->Inputs[FRAG_ATTRIB_FOGC];
1485 ASSERT(span->arrayMask & SPAN_FOG);
1486 fogc[0] = span->array->fog[col];
1487 fogc[1] = 0.0F;
1488 fogc[2] = 0.0F;
1489 fogc[3] = 0.0F;
1490 }
1491 for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
1492 if (inputsRead & (1 << (FRAG_ATTRIB_TEX0 + u))) {
1493 GLfloat *tex = machine->Inputs[FRAG_ATTRIB_TEX0 + u];
1494 /*ASSERT(ctx->Texture._EnabledCoordUnits & (1 << u));*/
1495 COPY_4V(tex, span->array->texcoords[u][col]);
1496 /*ASSERT(tex[0] != 0 || tex[1] != 0 || tex[2] != 0);*/
1497 }
1498 }
1499
1500 /* init condition codes */
1501 machine->CondCodes[0] = COND_EQ;
1502 machine->CondCodes[1] = COND_EQ;
1503 machine->CondCodes[2] = COND_EQ;
1504 machine->CondCodes[3] = COND_EQ;
1505 }
1506
1507
1508 /**
1509 * Run fragment program on the pixels in span from 'start' to 'end' - 1.
1510 */
1511 static void
1512 run_program(GLcontext *ctx, SWspan *span, GLuint start, GLuint end)
1513 {
1514 const struct gl_fragment_program *program = ctx->FragmentProgram._Current;
1515 struct fp_machine machine;
1516 GLuint i;
1517
1518 CurrentMachine = &machine;
1519
1520 for (i = start; i < end; i++) {
1521 if (span->array->mask[i]) {
1522 init_machine(ctx, &machine, program, span, i);
1523
1524 if (!execute_program(ctx, program, ~0, &machine, span, i)) {
1525 span->array->mask[i] = GL_FALSE; /* killed fragment */
1526 span->writeAll = GL_FALSE;
1527 }
1528
1529 /* Store output registers */
1530 {
1531 const GLfloat *colOut = machine.Outputs[FRAG_RESULT_COLR];
1532 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][RCOMP], colOut[0]);
1533 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][GCOMP], colOut[1]);
1534 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][BCOMP], colOut[2]);
1535 UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][ACOMP], colOut[3]);
1536 }
1537 /* depth value */
1538 if (program->Base.OutputsWritten & (1 << FRAG_RESULT_DEPR)) {
1539 const GLfloat depth = machine.Outputs[FRAG_RESULT_DEPR][2];
1540 if (depth <= 0.0)
1541 span->array->z[i] = 0;
1542 else if (depth >= 1.0)
1543 span->array->z[i] = ctx->DrawBuffer->_DepthMax;
1544 else
1545 span->array->z[i] = IROUND(depth * ctx->DrawBuffer->_DepthMaxF);
1546 }
1547 }
1548 }
1549 CurrentMachine = NULL;
1550 }
1551
1552
1553 /**
1554 * Execute the current fragment program for all the fragments
1555 * in the given span.
1556 */
1557 void
1558 _swrast_exec_fragment_program( GLcontext *ctx, SWspan *span )
1559 {
1560 const struct gl_fragment_program *program = ctx->FragmentProgram._Current;
1561
1562 ctx->_CurrentProgram = GL_FRAGMENT_PROGRAM_ARB; /* or NV, doesn't matter */
1563
1564 if (program->Base.Parameters) {
1565 _mesa_load_state_parameters(ctx, program->Base.Parameters);
1566 }
1567
1568 run_program(ctx, span, 0, span->end);
1569
1570 if (program->Base.OutputsWritten & (1 << FRAG_RESULT_DEPR)) {
1571 span->interpMask &= ~SPAN_Z;
1572 span->arrayMask |= SPAN_Z;
1573 }
1574
1575 ctx->_CurrentProgram = 0;
1576 }
1577