2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * 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.
27 * Vertex/Fragment program optimizations and transformations for program
34 #include "main/glheader.h"
35 #include "main/context.h"
36 #include "prog_parameter.h"
37 #include "prog_statevars.h"
39 #include "programopt.h"
40 #include "prog_instruction.h"
44 * This function inserts instructions for coordinate modelview * projection
45 * into a vertex program.
46 * May be used to implement the position_invariant option.
49 _mesa_insert_mvp_dp4_code(GLcontext
*ctx
, struct gl_vertex_program
*vprog
)
51 struct prog_instruction
*newInst
;
52 const GLuint origLen
= vprog
->Base
.NumInstructions
;
53 const GLuint newLen
= origLen
+ 4;
57 * Setup state references for the modelview/projection matrix.
58 * XXX we should check if these state vars are already declared.
60 static const gl_state_index mvpState
[4][STATE_LENGTH
] = {
61 { STATE_MVP_MATRIX
, 0, 0, 0, 0 }, /* state.matrix.mvp.row[0] */
62 { STATE_MVP_MATRIX
, 0, 1, 1, 0 }, /* state.matrix.mvp.row[1] */
63 { STATE_MVP_MATRIX
, 0, 2, 2, 0 }, /* state.matrix.mvp.row[2] */
64 { STATE_MVP_MATRIX
, 0, 3, 3, 0 }, /* state.matrix.mvp.row[3] */
68 for (i
= 0; i
< 4; i
++) {
69 mvpRef
[i
] = _mesa_add_state_reference(vprog
->Base
.Parameters
,
73 /* Alloc storage for new instructions */
74 newInst
= _mesa_alloc_instructions(newLen
);
76 _mesa_error(ctx
, GL_OUT_OF_MEMORY
,
77 "glProgramString(inserting position_invariant code)");
82 * Generated instructions:
83 * newInst[0] = DP4 result.position.x, mvp.row[0], vertex.position;
84 * newInst[1] = DP4 result.position.y, mvp.row[1], vertex.position;
85 * newInst[2] = DP4 result.position.z, mvp.row[2], vertex.position;
86 * newInst[3] = DP4 result.position.w, mvp.row[3], vertex.position;
88 _mesa_init_instructions(newInst
, 4);
89 for (i
= 0; i
< 4; i
++) {
90 newInst
[i
].Opcode
= OPCODE_DP4
;
91 newInst
[i
].DstReg
.File
= PROGRAM_OUTPUT
;
92 newInst
[i
].DstReg
.Index
= VERT_RESULT_HPOS
;
93 newInst
[i
].DstReg
.WriteMask
= (WRITEMASK_X
<< i
);
94 newInst
[i
].SrcReg
[0].File
= PROGRAM_STATE_VAR
;
95 newInst
[i
].SrcReg
[0].Index
= mvpRef
[i
];
96 newInst
[i
].SrcReg
[0].Swizzle
= SWIZZLE_NOOP
;
97 newInst
[i
].SrcReg
[1].File
= PROGRAM_INPUT
;
98 newInst
[i
].SrcReg
[1].Index
= VERT_ATTRIB_POS
;
99 newInst
[i
].SrcReg
[1].Swizzle
= SWIZZLE_NOOP
;
102 /* Append original instructions after new instructions */
103 _mesa_copy_instructions (newInst
+ 4, vprog
->Base
.Instructions
, origLen
);
105 /* free old instructions */
106 _mesa_free_instructions(vprog
->Base
.Instructions
, origLen
);
108 /* install new instructions */
109 vprog
->Base
.Instructions
= newInst
;
110 vprog
->Base
.NumInstructions
= newLen
;
111 vprog
->Base
.InputsRead
|= VERT_BIT_POS
;
112 vprog
->Base
.OutputsWritten
|= BITFIELD64_BIT(VERT_RESULT_HPOS
);
117 _mesa_insert_mvp_mad_code(GLcontext
*ctx
, struct gl_vertex_program
*vprog
)
119 struct prog_instruction
*newInst
;
120 const GLuint origLen
= vprog
->Base
.NumInstructions
;
121 const GLuint newLen
= origLen
+ 4;
126 * Setup state references for the modelview/projection matrix.
127 * XXX we should check if these state vars are already declared.
129 static const gl_state_index mvpState
[4][STATE_LENGTH
] = {
130 { STATE_MVP_MATRIX
, 0, 0, 0, STATE_MATRIX_TRANSPOSE
},
131 { STATE_MVP_MATRIX
, 0, 1, 1, STATE_MATRIX_TRANSPOSE
},
132 { STATE_MVP_MATRIX
, 0, 2, 2, STATE_MATRIX_TRANSPOSE
},
133 { STATE_MVP_MATRIX
, 0, 3, 3, STATE_MATRIX_TRANSPOSE
},
137 for (i
= 0; i
< 4; i
++) {
138 mvpRef
[i
] = _mesa_add_state_reference(vprog
->Base
.Parameters
,
142 /* Alloc storage for new instructions */
143 newInst
= _mesa_alloc_instructions(newLen
);
145 _mesa_error(ctx
, GL_OUT_OF_MEMORY
,
146 "glProgramString(inserting position_invariant code)");
151 hposTemp
= vprog
->Base
.NumTemporaries
++;
154 * Generated instructions:
155 * emit_op2(p, OPCODE_MUL, tmp, 0, swizzle1(src,X), mat[0]);
156 * emit_op3(p, OPCODE_MAD, tmp, 0, swizzle1(src,Y), mat[1], tmp);
157 * emit_op3(p, OPCODE_MAD, tmp, 0, swizzle1(src,Z), mat[2], tmp);
158 * emit_op3(p, OPCODE_MAD, dest, 0, swizzle1(src,W), mat[3], tmp);
160 _mesa_init_instructions(newInst
, 4);
162 newInst
[0].Opcode
= OPCODE_MUL
;
163 newInst
[0].DstReg
.File
= PROGRAM_TEMPORARY
;
164 newInst
[0].DstReg
.Index
= hposTemp
;
165 newInst
[0].DstReg
.WriteMask
= WRITEMASK_XYZW
;
166 newInst
[0].SrcReg
[0].File
= PROGRAM_INPUT
;
167 newInst
[0].SrcReg
[0].Index
= VERT_ATTRIB_POS
;
168 newInst
[0].SrcReg
[0].Swizzle
= SWIZZLE_XXXX
;
169 newInst
[0].SrcReg
[1].File
= PROGRAM_STATE_VAR
;
170 newInst
[0].SrcReg
[1].Index
= mvpRef
[0];
171 newInst
[0].SrcReg
[1].Swizzle
= SWIZZLE_NOOP
;
173 for (i
= 1; i
<= 2; i
++) {
174 newInst
[i
].Opcode
= OPCODE_MAD
;
175 newInst
[i
].DstReg
.File
= PROGRAM_TEMPORARY
;
176 newInst
[i
].DstReg
.Index
= hposTemp
;
177 newInst
[i
].DstReg
.WriteMask
= WRITEMASK_XYZW
;
178 newInst
[i
].SrcReg
[0].File
= PROGRAM_INPUT
;
179 newInst
[i
].SrcReg
[0].Index
= VERT_ATTRIB_POS
;
180 newInst
[i
].SrcReg
[0].Swizzle
= MAKE_SWIZZLE4(i
,i
,i
,i
);
181 newInst
[i
].SrcReg
[1].File
= PROGRAM_STATE_VAR
;
182 newInst
[i
].SrcReg
[1].Index
= mvpRef
[i
];
183 newInst
[i
].SrcReg
[1].Swizzle
= SWIZZLE_NOOP
;
184 newInst
[i
].SrcReg
[2].File
= PROGRAM_TEMPORARY
;
185 newInst
[i
].SrcReg
[2].Index
= hposTemp
;
186 newInst
[1].SrcReg
[2].Swizzle
= SWIZZLE_NOOP
;
189 newInst
[3].Opcode
= OPCODE_MAD
;
190 newInst
[3].DstReg
.File
= PROGRAM_OUTPUT
;
191 newInst
[3].DstReg
.Index
= VERT_RESULT_HPOS
;
192 newInst
[3].DstReg
.WriteMask
= WRITEMASK_XYZW
;
193 newInst
[3].SrcReg
[0].File
= PROGRAM_INPUT
;
194 newInst
[3].SrcReg
[0].Index
= VERT_ATTRIB_POS
;
195 newInst
[3].SrcReg
[0].Swizzle
= SWIZZLE_WWWW
;
196 newInst
[3].SrcReg
[1].File
= PROGRAM_STATE_VAR
;
197 newInst
[3].SrcReg
[1].Index
= mvpRef
[3];
198 newInst
[3].SrcReg
[1].Swizzle
= SWIZZLE_NOOP
;
199 newInst
[3].SrcReg
[2].File
= PROGRAM_TEMPORARY
;
200 newInst
[3].SrcReg
[2].Index
= hposTemp
;
201 newInst
[3].SrcReg
[2].Swizzle
= SWIZZLE_NOOP
;
204 /* Append original instructions after new instructions */
205 _mesa_copy_instructions (newInst
+ 4, vprog
->Base
.Instructions
, origLen
);
207 /* free old instructions */
208 _mesa_free_instructions(vprog
->Base
.Instructions
, origLen
);
210 /* install new instructions */
211 vprog
->Base
.Instructions
= newInst
;
212 vprog
->Base
.NumInstructions
= newLen
;
213 vprog
->Base
.InputsRead
|= VERT_BIT_POS
;
214 vprog
->Base
.OutputsWritten
|= BITFIELD64_BIT(VERT_RESULT_HPOS
);
219 _mesa_insert_mvp_code(GLcontext
*ctx
, struct gl_vertex_program
*vprog
)
221 if (ctx
->mvp_with_dp4
)
222 _mesa_insert_mvp_dp4_code( ctx
, vprog
);
224 _mesa_insert_mvp_mad_code( ctx
, vprog
);
233 * Append extra instructions onto the given fragment program to implement
234 * the fog mode specified by fprog->FogOption.
235 * The fragment.fogcoord input is used to compute the fog blend factor.
237 * XXX with a little work, this function could be adapted to add fog code
238 * to vertex programs too.
241 _mesa_append_fog_code(GLcontext
*ctx
, struct gl_fragment_program
*fprog
)
243 static const gl_state_index fogPStateOpt
[STATE_LENGTH
]
244 = { STATE_INTERNAL
, STATE_FOG_PARAMS_OPTIMIZED
, 0, 0, 0 };
245 static const gl_state_index fogColorState
[STATE_LENGTH
]
246 = { STATE_FOG_COLOR
, 0, 0, 0, 0};
247 struct prog_instruction
*newInst
, *inst
;
248 const GLuint origLen
= fprog
->Base
.NumInstructions
;
249 const GLuint newLen
= origLen
+ 5;
251 GLint fogPRefOpt
, fogColorRef
; /* state references */
252 GLuint colorTemp
, fogFactorTemp
; /* temporary registerss */
254 if (fprog
->FogOption
== GL_NONE
) {
255 _mesa_problem(ctx
, "_mesa_append_fog_code() called for fragment program"
256 " with FogOption == GL_NONE");
260 /* Alloc storage for new instructions */
261 newInst
= _mesa_alloc_instructions(newLen
);
263 _mesa_error(ctx
, GL_OUT_OF_MEMORY
,
264 "glProgramString(inserting fog_option code)");
268 /* Copy orig instructions into new instruction buffer */
269 _mesa_copy_instructions(newInst
, fprog
->Base
.Instructions
, origLen
);
271 /* PARAM fogParamsRefOpt = internal optimized fog params; */
273 = _mesa_add_state_reference(fprog
->Base
.Parameters
, fogPStateOpt
);
274 /* PARAM fogColorRef = state.fog.color; */
276 = _mesa_add_state_reference(fprog
->Base
.Parameters
, fogColorState
);
278 /* TEMP colorTemp; */
279 colorTemp
= fprog
->Base
.NumTemporaries
++;
280 /* TEMP fogFactorTemp; */
281 fogFactorTemp
= fprog
->Base
.NumTemporaries
++;
283 /* Scan program to find where result.color is written */
285 for (i
= 0; i
< fprog
->Base
.NumInstructions
; i
++) {
286 if (inst
->Opcode
== OPCODE_END
)
288 if (inst
->DstReg
.File
== PROGRAM_OUTPUT
&&
289 inst
->DstReg
.Index
== FRAG_RESULT_COLOR
) {
290 /* change the instruction to write to colorTemp w/ clamping */
291 inst
->DstReg
.File
= PROGRAM_TEMPORARY
;
292 inst
->DstReg
.Index
= colorTemp
;
293 inst
->SaturateMode
= SATURATE_ZERO_ONE
;
294 /* don't break (may be several writes to result.color) */
298 assert(inst
->Opcode
== OPCODE_END
); /* we'll overwrite this inst */
300 _mesa_init_instructions(inst
, 5);
302 /* emit instructions to compute fog blending factor */
303 if (fprog
->FogOption
== GL_LINEAR
) {
304 /* MAD fogFactorTemp.x, fragment.fogcoord.x, fogPRefOpt.x, fogPRefOpt.y; */
305 inst
->Opcode
= OPCODE_MAD
;
306 inst
->DstReg
.File
= PROGRAM_TEMPORARY
;
307 inst
->DstReg
.Index
= fogFactorTemp
;
308 inst
->DstReg
.WriteMask
= WRITEMASK_X
;
309 inst
->SrcReg
[0].File
= PROGRAM_INPUT
;
310 inst
->SrcReg
[0].Index
= FRAG_ATTRIB_FOGC
;
311 inst
->SrcReg
[0].Swizzle
= SWIZZLE_XXXX
;
312 inst
->SrcReg
[1].File
= PROGRAM_STATE_VAR
;
313 inst
->SrcReg
[1].Index
= fogPRefOpt
;
314 inst
->SrcReg
[1].Swizzle
= SWIZZLE_XXXX
;
315 inst
->SrcReg
[2].File
= PROGRAM_STATE_VAR
;
316 inst
->SrcReg
[2].Index
= fogPRefOpt
;
317 inst
->SrcReg
[2].Swizzle
= SWIZZLE_YYYY
;
318 inst
->SaturateMode
= SATURATE_ZERO_ONE
;
322 ASSERT(fprog
->FogOption
== GL_EXP
|| fprog
->FogOption
== GL_EXP2
);
323 /* fogPRefOpt.z = d/ln(2), fogPRefOpt.w = d/sqrt(ln(2) */
324 /* EXP: MUL fogFactorTemp.x, fogPRefOpt.z, fragment.fogcoord.x; */
325 /* EXP2: MUL fogFactorTemp.x, fogPRefOpt.w, fragment.fogcoord.x; */
326 inst
->Opcode
= OPCODE_MUL
;
327 inst
->DstReg
.File
= PROGRAM_TEMPORARY
;
328 inst
->DstReg
.Index
= fogFactorTemp
;
329 inst
->DstReg
.WriteMask
= WRITEMASK_X
;
330 inst
->SrcReg
[0].File
= PROGRAM_STATE_VAR
;
331 inst
->SrcReg
[0].Index
= fogPRefOpt
;
332 inst
->SrcReg
[0].Swizzle
333 = (fprog
->FogOption
== GL_EXP
) ? SWIZZLE_ZZZZ
: SWIZZLE_WWWW
;
334 inst
->SrcReg
[1].File
= PROGRAM_INPUT
;
335 inst
->SrcReg
[1].Index
= FRAG_ATTRIB_FOGC
;
336 inst
->SrcReg
[1].Swizzle
= SWIZZLE_XXXX
;
338 if (fprog
->FogOption
== GL_EXP2
) {
339 /* MUL fogFactorTemp.x, fogFactorTemp.x, fogFactorTemp.x; */
340 inst
->Opcode
= OPCODE_MUL
;
341 inst
->DstReg
.File
= PROGRAM_TEMPORARY
;
342 inst
->DstReg
.Index
= fogFactorTemp
;
343 inst
->DstReg
.WriteMask
= WRITEMASK_X
;
344 inst
->SrcReg
[0].File
= PROGRAM_TEMPORARY
;
345 inst
->SrcReg
[0].Index
= fogFactorTemp
;
346 inst
->SrcReg
[0].Swizzle
= SWIZZLE_XXXX
;
347 inst
->SrcReg
[1].File
= PROGRAM_TEMPORARY
;
348 inst
->SrcReg
[1].Index
= fogFactorTemp
;
349 inst
->SrcReg
[1].Swizzle
= SWIZZLE_XXXX
;
352 /* EX2_SAT fogFactorTemp.x, -fogFactorTemp.x; */
353 inst
->Opcode
= OPCODE_EX2
;
354 inst
->DstReg
.File
= PROGRAM_TEMPORARY
;
355 inst
->DstReg
.Index
= fogFactorTemp
;
356 inst
->DstReg
.WriteMask
= WRITEMASK_X
;
357 inst
->SrcReg
[0].File
= PROGRAM_TEMPORARY
;
358 inst
->SrcReg
[0].Index
= fogFactorTemp
;
359 inst
->SrcReg
[0].Negate
= NEGATE_XYZW
;
360 inst
->SrcReg
[0].Swizzle
= SWIZZLE_XXXX
;
361 inst
->SaturateMode
= SATURATE_ZERO_ONE
;
364 /* LRP result.color.xyz, fogFactorTemp.xxxx, colorTemp, fogColorRef; */
365 inst
->Opcode
= OPCODE_LRP
;
366 inst
->DstReg
.File
= PROGRAM_OUTPUT
;
367 inst
->DstReg
.Index
= FRAG_RESULT_COLOR
;
368 inst
->DstReg
.WriteMask
= WRITEMASK_XYZ
;
369 inst
->SrcReg
[0].File
= PROGRAM_TEMPORARY
;
370 inst
->SrcReg
[0].Index
= fogFactorTemp
;
371 inst
->SrcReg
[0].Swizzle
= SWIZZLE_XXXX
;
372 inst
->SrcReg
[1].File
= PROGRAM_TEMPORARY
;
373 inst
->SrcReg
[1].Index
= colorTemp
;
374 inst
->SrcReg
[1].Swizzle
= SWIZZLE_NOOP
;
375 inst
->SrcReg
[2].File
= PROGRAM_STATE_VAR
;
376 inst
->SrcReg
[2].Index
= fogColorRef
;
377 inst
->SrcReg
[2].Swizzle
= SWIZZLE_NOOP
;
379 /* MOV result.color.w, colorTemp.x; # copy alpha */
380 inst
->Opcode
= OPCODE_MOV
;
381 inst
->DstReg
.File
= PROGRAM_OUTPUT
;
382 inst
->DstReg
.Index
= FRAG_RESULT_COLOR
;
383 inst
->DstReg
.WriteMask
= WRITEMASK_W
;
384 inst
->SrcReg
[0].File
= PROGRAM_TEMPORARY
;
385 inst
->SrcReg
[0].Index
= colorTemp
;
386 inst
->SrcReg
[0].Swizzle
= SWIZZLE_NOOP
;
389 inst
->Opcode
= OPCODE_END
;
392 /* free old instructions */
393 _mesa_free_instructions(fprog
->Base
.Instructions
, origLen
);
395 /* install new instructions */
396 fprog
->Base
.Instructions
= newInst
;
397 fprog
->Base
.NumInstructions
= inst
- newInst
;
398 fprog
->Base
.InputsRead
|= FRAG_BIT_FOGC
;
399 /* XXX do this? fprog->FogOption = GL_NONE; */
405 is_texture_instruction(const struct prog_instruction
*inst
)
407 switch (inst
->Opcode
) {
422 * Count the number of texure indirections in the given program.
423 * The program's NumTexIndirections field will be updated.
424 * See the GL_ARB_fragment_program spec (issue 24) for details.
425 * XXX we count texture indirections in texenvprogram.c (maybe use this code
426 * instead and elsewhere).
429 _mesa_count_texture_indirections(struct gl_program
*prog
)
431 GLuint indirections
= 1;
432 GLbitfield tempsOutput
= 0x0;
433 GLbitfield aluTemps
= 0x0;
436 for (i
= 0; i
< prog
->NumInstructions
; i
++) {
437 const struct prog_instruction
*inst
= prog
->Instructions
+ i
;
439 if (is_texture_instruction(inst
)) {
440 if (((inst
->SrcReg
[0].File
== PROGRAM_TEMPORARY
) &&
441 (tempsOutput
& (1 << inst
->SrcReg
[0].Index
))) ||
442 ((inst
->Opcode
!= OPCODE_KIL
) &&
443 (inst
->DstReg
.File
== PROGRAM_TEMPORARY
) &&
444 (aluTemps
& (1 << inst
->DstReg
.Index
))))
453 for (j
= 0; j
< 3; j
++) {
454 if (inst
->SrcReg
[j
].File
== PROGRAM_TEMPORARY
)
455 aluTemps
|= (1 << inst
->SrcReg
[j
].Index
);
457 if (inst
->DstReg
.File
== PROGRAM_TEMPORARY
)
458 aluTemps
|= (1 << inst
->DstReg
.Index
);
461 if ((inst
->Opcode
!= OPCODE_KIL
) && (inst
->DstReg
.File
== PROGRAM_TEMPORARY
))
462 tempsOutput
|= (1 << inst
->DstReg
.Index
);
465 prog
->NumTexIndirections
= indirections
;
470 * Count number of texture instructions in given program and update the
471 * program's NumTexInstructions field.
474 _mesa_count_texture_instructions(struct gl_program
*prog
)
477 prog
->NumTexInstructions
= 0;
478 for (i
= 0; i
< prog
->NumInstructions
; i
++) {
479 prog
->NumTexInstructions
+= is_texture_instruction(prog
->Instructions
+ i
);
485 * Scan/rewrite program to remove reads of custom (output) registers.
486 * The passed type has to be either PROGRAM_OUTPUT or PROGRAM_VARYING
487 * (for vertex shaders).
488 * In GLSL shaders, varying vars can be read and written.
489 * On some hardware, trying to read an output register causes trouble.
490 * So, rewrite the program to use a temporary register in this case.
493 _mesa_remove_output_reads(struct gl_program
*prog
, gl_register_file type
)
496 GLint outputMap
[VERT_RESULT_MAX
];
497 GLuint numVaryingReads
= 0;
499 assert(type
== PROGRAM_VARYING
|| type
== PROGRAM_OUTPUT
);
500 assert(prog
->Target
== GL_VERTEX_PROGRAM_ARB
|| type
!= PROGRAM_VARYING
);
502 for (i
= 0; i
< VERT_RESULT_MAX
; i
++)
505 /* look for instructions which read from varying vars */
506 for (i
= 0; i
< prog
->NumInstructions
; i
++) {
507 struct prog_instruction
*inst
= prog
->Instructions
+ i
;
508 const GLuint numSrc
= _mesa_num_inst_src_regs(inst
->Opcode
);
510 for (j
= 0; j
< numSrc
; j
++) {
511 if (inst
->SrcReg
[j
].File
== type
) {
512 /* replace the read with a temp reg */
513 const GLuint var
= inst
->SrcReg
[j
].Index
;
514 if (outputMap
[var
] == -1) {
516 outputMap
[var
] = _mesa_find_free_register(prog
,
519 inst
->SrcReg
[j
].File
= PROGRAM_TEMPORARY
;
520 inst
->SrcReg
[j
].Index
= outputMap
[var
];
525 if (numVaryingReads
== 0)
526 return; /* nothing to be done */
528 /* look for instructions which write to the varying vars identified above */
529 for (i
= 0; i
< prog
->NumInstructions
; i
++) {
530 struct prog_instruction
*inst
= prog
->Instructions
+ i
;
531 const GLuint numSrc
= _mesa_num_inst_src_regs(inst
->Opcode
);
533 for (j
= 0; j
< numSrc
; j
++) {
534 if (inst
->DstReg
.File
== type
&&
535 outputMap
[inst
->DstReg
.Index
] >= 0) {
536 /* change inst to write to the temp reg, instead of the varying */
537 inst
->DstReg
.File
= PROGRAM_TEMPORARY
;
538 inst
->DstReg
.Index
= outputMap
[inst
->DstReg
.Index
];
543 /* insert new instructions to copy the temp vars to the varying vars */
545 struct prog_instruction
*inst
;
548 /* Look for END instruction and insert the new varying writes */
550 for (i
= 0; i
< prog
->NumInstructions
; i
++) {
551 struct prog_instruction
*inst
= prog
->Instructions
+ i
;
552 if (inst
->Opcode
== OPCODE_END
) {
554 _mesa_insert_instructions(prog
, i
, numVaryingReads
);
561 /* insert new MOV instructions here */
562 inst
= prog
->Instructions
+ endPos
;
563 for (var
= 0; var
< VERT_RESULT_MAX
; var
++) {
564 if (outputMap
[var
] >= 0) {
565 /* MOV VAR[var], TEMP[tmp]; */
566 inst
->Opcode
= OPCODE_MOV
;
567 inst
->DstReg
.File
= type
;
568 inst
->DstReg
.Index
= var
;
569 inst
->SrcReg
[0].File
= PROGRAM_TEMPORARY
;
570 inst
->SrcReg
[0].Index
= outputMap
[var
];
579 * Make the given fragment program into a "no-op" shader.
580 * Actually, just copy the incoming fragment color (or texcoord)
581 * to the output color.
582 * This is for debug/test purposes.
585 _mesa_nop_fragment_program(GLcontext
*ctx
, struct gl_fragment_program
*prog
)
587 struct prog_instruction
*inst
;
590 inst
= _mesa_alloc_instructions(2);
592 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "_mesa_nop_fragment_program");
596 _mesa_init_instructions(inst
, 2);
598 inst
[0].Opcode
= OPCODE_MOV
;
599 inst
[0].DstReg
.File
= PROGRAM_OUTPUT
;
600 inst
[0].DstReg
.Index
= FRAG_RESULT_COLOR
;
601 inst
[0].SrcReg
[0].File
= PROGRAM_INPUT
;
602 if (prog
->Base
.InputsRead
& FRAG_BIT_COL0
)
603 inputAttr
= FRAG_ATTRIB_COL0
;
605 inputAttr
= FRAG_ATTRIB_TEX0
;
606 inst
[0].SrcReg
[0].Index
= inputAttr
;
608 inst
[1].Opcode
= OPCODE_END
;
610 _mesa_free_instructions(prog
->Base
.Instructions
,
611 prog
->Base
.NumInstructions
);
613 prog
->Base
.Instructions
= inst
;
614 prog
->Base
.NumInstructions
= 2;
615 prog
->Base
.InputsRead
= 1 << inputAttr
;
616 prog
->Base
.OutputsWritten
= BITFIELD64_BIT(FRAG_RESULT_COLOR
);
621 * \sa _mesa_nop_fragment_program
622 * Replace the given vertex program with a "no-op" program that just
623 * transforms vertex position and emits color.
626 _mesa_nop_vertex_program(GLcontext
*ctx
, struct gl_vertex_program
*prog
)
628 struct prog_instruction
*inst
;
632 * Start with a simple vertex program that emits color.
634 inst
= _mesa_alloc_instructions(2);
636 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "_mesa_nop_vertex_program");
640 _mesa_init_instructions(inst
, 2);
642 inst
[0].Opcode
= OPCODE_MOV
;
643 inst
[0].DstReg
.File
= PROGRAM_OUTPUT
;
644 inst
[0].DstReg
.Index
= VERT_RESULT_COL0
;
645 inst
[0].SrcReg
[0].File
= PROGRAM_INPUT
;
646 if (prog
->Base
.InputsRead
& VERT_BIT_COLOR0
)
647 inputAttr
= VERT_ATTRIB_COLOR0
;
649 inputAttr
= VERT_ATTRIB_TEX0
;
650 inst
[0].SrcReg
[0].Index
= inputAttr
;
652 inst
[1].Opcode
= OPCODE_END
;
654 _mesa_free_instructions(prog
->Base
.Instructions
,
655 prog
->Base
.NumInstructions
);
657 prog
->Base
.Instructions
= inst
;
658 prog
->Base
.NumInstructions
= 2;
659 prog
->Base
.InputsRead
= 1 << inputAttr
;
660 prog
->Base
.OutputsWritten
= BITFIELD64_BIT(VERT_RESULT_COL0
);
663 * Now insert code to do standard modelview/projection transformation.
665 _mesa_insert_mvp_code(ctx
, prog
);