1 /*
2 * Copyright 2014 VMware, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial portions
15 * 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
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
20 * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
21 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 /**
28 * This utility transforms the geometry shader to emulate point sprite by
29 * drawing a quad. It also adds an extra output for the original point position
30 * if the point position is to be written to a stream output buffer.
31 * Note: It assumes the driver will add a constant for the inverse viewport
32 * after the user defined constants.
33 */
34
35 #include "util/u_debug.h"
36 #include "util/u_math.h"
37 #include "tgsi_info.h"
38 #include "tgsi_point_sprite.h"
39 #include "tgsi_transform.h"
40 #include "pipe/p_state.h"
41
42 #define INVALID_INDEX 9999
43
44 /* Set swizzle based on the immediates (0, 1, 0, -1) */
45 static inline unsigned
set_swizzle(int x,int y,int z,int w)46 set_swizzle(int x, int y, int z, int w)
47 {
48 static const unsigned map[3] = {TGSI_SWIZZLE_W, TGSI_SWIZZLE_X,
49 TGSI_SWIZZLE_Y};
50 assert(x >= -1);
51 assert(x <= 1);
52 assert(y >= -1);
53 assert(y <= 1);
54 assert(z >= -1);
55 assert(z <= 1);
56 assert(w >= -1);
57 assert(w <= 1);
58
59 return map[x+1] | (map[y+1] << 2) | (map[z+1] << 4) | (map[w+1] << 6);
60 }
61
62 static inline unsigned
get_swizzle(unsigned swizzle,unsigned component)63 get_swizzle(unsigned swizzle, unsigned component)
64 {
65 assert(component < 4);
66 return (swizzle >> (component * 2)) & 0x3;
67 }
68
69 struct psprite_transform_context
70 {
71 struct tgsi_transform_context base;
72 unsigned num_tmp;
73 unsigned num_out;
74 unsigned num_orig_out;
75 unsigned num_const;
76 unsigned num_imm;
77 unsigned point_size_in; // point size input
78 unsigned point_size_out; // point size output
79 unsigned point_size_tmp; // point size temp
80 unsigned point_pos_in; // point pos input
81 unsigned point_pos_out; // point pos output
82 unsigned point_pos_sout; // original point pos for streamout
83 unsigned point_pos_tmp; // point pos temp
84 unsigned point_scale_tmp; // point scale temp
85 unsigned point_color_out; // point color output
86 unsigned point_color_tmp; // point color temp
87 unsigned point_imm; // point immediates
88 unsigned point_ivp; // point inverseViewport constant
89 unsigned point_dir_swz[4]; // point direction swizzle
90 unsigned point_coord_swz[4]; // point coord swizzle
91 unsigned point_coord_enable; // point coord enable mask
92 unsigned point_coord_decl; // point coord output declared mask
93 unsigned point_coord_out; // point coord output starting index
94 unsigned point_coord_aa; // aa point coord semantic index
95 unsigned point_coord_k; // aa point coord threshold distance
96 unsigned stream_out_point_pos:1; // set if to stream out original point pos
97 unsigned aa_point:1; // set if doing aa point
98 unsigned out_tmp_index[PIPE_MAX_SHADER_OUTPUTS];
99 int max_generic; // max generic semantic index
100 };
101
102 static inline struct psprite_transform_context *
psprite_transform_context(struct tgsi_transform_context * ctx)103 psprite_transform_context(struct tgsi_transform_context *ctx)
104 {
105 return (struct psprite_transform_context *) ctx;
106 }
107
108
109 /**
110 * TGSI declaration transform callback.
111 */
112 static void
psprite_decl(struct tgsi_transform_context * ctx,struct tgsi_full_declaration * decl)113 psprite_decl(struct tgsi_transform_context *ctx,
114 struct tgsi_full_declaration *decl)
115 {
116 struct psprite_transform_context *ts = psprite_transform_context(ctx);
117 unsigned range_end = decl->Range.Last + 1;
118
119 if (decl->Declaration.File == TGSI_FILE_INPUT) {
120 if (decl->Semantic.Name == TGSI_SEMANTIC_PSIZE) {
121 ts->point_size_in = decl->Range.First;
122 }
123 else if (decl->Semantic.Name == TGSI_SEMANTIC_POSITION) {
124 ts->point_pos_in = decl->Range.First;
125 }
126 }
127 else if (decl->Declaration.File == TGSI_FILE_OUTPUT) {
128 if (decl->Semantic.Name == TGSI_SEMANTIC_PSIZE) {
129 ts->point_size_out = decl->Range.First;
130 }
131 else if (decl->Semantic.Name == TGSI_SEMANTIC_POSITION) {
132 ts->point_pos_out = decl->Range.First;
133 }
134 else if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
135 decl->Semantic.Index < 32) {
136 ts->point_coord_decl |= 1 << decl->Semantic.Index;
137 ts->max_generic = MAX2(ts->max_generic, (int)decl->Semantic.Index);
138 }
139 ts->num_out = MAX2(ts->num_out, range_end);
140 }
141 else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
142 ts->num_tmp = MAX2(ts->num_tmp, range_end);
143 }
144 else if (decl->Declaration.File == TGSI_FILE_CONSTANT) {
145 ts->num_const = MAX2(ts->num_const, range_end);
146 }
147
148 ctx->emit_declaration(ctx, decl);
149 }
150
151 /**
152 * TGSI immediate declaration transform callback.
153 */
154 static void
psprite_immediate(struct tgsi_transform_context * ctx,struct tgsi_full_immediate * imm)155 psprite_immediate(struct tgsi_transform_context *ctx,
156 struct tgsi_full_immediate *imm)
157 {
158 struct psprite_transform_context *ts = psprite_transform_context(ctx);
159
160 ctx->emit_immediate(ctx, imm);
161 ts->num_imm++;
162 }
163
164
165 /**
166 * TGSI transform prolog callback.
167 */
168 static void
psprite_prolog(struct tgsi_transform_context * ctx)169 psprite_prolog(struct tgsi_transform_context *ctx)
170 {
171 struct psprite_transform_context *ts = psprite_transform_context(ctx);
172 unsigned point_coord_enable, en;
173 unsigned i;
174
175 /* Replace output registers with temporary registers */
176 for (i = 0; i < ts->num_out; i++) {
177 ts->out_tmp_index[i] = ts->num_tmp++;
178 }
179 ts->num_orig_out = ts->num_out;
180
181 /* Declare a tmp register for point scale */
182 ts->point_scale_tmp = ts->num_tmp++;
183
184 if (ts->point_size_out != INVALID_INDEX)
185 ts->point_size_tmp = ts->out_tmp_index[ts->point_size_out];
186 else
187 ts->point_size_tmp = ts->num_tmp++;
188
189 assert(ts->point_pos_out != INVALID_INDEX);
190 ts->point_pos_tmp = ts->out_tmp_index[ts->point_pos_out];
191 ts->out_tmp_index[ts->point_pos_out] = INVALID_INDEX;
192
193 /* Declare one more tmp register for point coord threshold distance
194 * if we are generating anti-aliased point.
195 */
196 if (ts->aa_point)
197 ts->point_coord_k = ts->num_tmp++;
198
199 tgsi_transform_temps_decl(ctx, ts->point_size_tmp, ts->num_tmp-1);
200
201 /* Declare an extra output for the original point position for stream out */
202 if (ts->stream_out_point_pos) {
203 ts->point_pos_sout = ts->num_out++;
204 tgsi_transform_output_decl(ctx, ts->point_pos_sout,
205 TGSI_SEMANTIC_GENERIC, 0, 0);
206 }
207
208 /* point coord outputs to be declared */
209 point_coord_enable = ts->point_coord_enable & ~ts->point_coord_decl;
210
211 /* Declare outputs for those point coord that are enabled but are not
212 * already declared in this shader.
213 */
214 ts->point_coord_out = ts->num_out;
215 if (point_coord_enable) {
216 for (i = 0, en = point_coord_enable; en; en>>=1, i++) {
217 if (en & 0x1) {
218 tgsi_transform_output_decl(ctx, ts->num_out++,
219 TGSI_SEMANTIC_GENERIC, i, 0);
220 ts->max_generic = MAX2(ts->max_generic, (int)i);
221 }
222 }
223 }
224
225 /* add an extra generic output for aa point texcoord */
226 if (ts->aa_point) {
227 ts->point_coord_aa = ts->max_generic + 1;
228 assert((ts->point_coord_enable & (1 << ts->point_coord_aa)) == 0);
229 ts->point_coord_enable |= 1 << (ts->point_coord_aa);
230 tgsi_transform_output_decl(ctx, ts->num_out++, TGSI_SEMANTIC_GENERIC,
231 ts->point_coord_aa, 0);
232 }
233
234 /* Declare extra immediates */
235 ts->point_imm = ts->num_imm;
236 tgsi_transform_immediate_decl(ctx, 0, 1, 0.5, -1);
237
238 /* Declare point constant -
239 * constant.xy -- inverseViewport
240 * constant.z -- current point size
241 * constant.w -- max point size
242 * The driver needs to add this constant to the constant buffer
243 */
244 ts->point_ivp = ts->num_const++;
245 tgsi_transform_const_decl(ctx, ts->point_ivp, ts->point_ivp);
246
247 /* If this geometry shader does not specify point size,
248 * get the current point size from the point constant.
249 */
250 if (ts->point_size_out == INVALID_INDEX) {
251 struct tgsi_full_instruction inst;
252
253 inst = tgsi_default_full_instruction();
254 inst.Instruction.Opcode = TGSI_OPCODE_MOV;
255 inst.Instruction.NumDstRegs = 1;
256 tgsi_transform_dst_reg(&inst.Dst[0], TGSI_FILE_TEMPORARY,
257 ts->point_size_tmp, TGSI_WRITEMASK_XYZW);
258 inst.Instruction.NumSrcRegs = 1;
259 tgsi_transform_src_reg(&inst.Src[0], TGSI_FILE_CONSTANT,
260 ts->point_ivp, TGSI_SWIZZLE_Z,
261 TGSI_SWIZZLE_Z, TGSI_SWIZZLE_Z, TGSI_SWIZZLE_Z);
262 ctx->emit_instruction(ctx, &inst);
263 }
264 }
265
266
267 /**
268 * Add the point sprite emulation instructions at the emit vertex instruction
269 */
270 static void
psprite_emit_vertex_inst(struct tgsi_transform_context * ctx,struct tgsi_full_instruction * vert_inst)271 psprite_emit_vertex_inst(struct tgsi_transform_context *ctx,
272 struct tgsi_full_instruction *vert_inst)
273 {
274 struct psprite_transform_context *ts = psprite_transform_context(ctx);
275 struct tgsi_full_instruction inst;
276 unsigned point_coord_enable, en;
277 unsigned i, j, s;
278
279 /* new point coord outputs */
280 point_coord_enable = ts->point_coord_enable & ~ts->point_coord_decl;
281
282 /* OUTPUT[pos_sout] = TEMP[pos] */
283 if (ts->point_pos_sout != INVALID_INDEX) {
284 tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV,
285 TGSI_FILE_OUTPUT, ts->point_pos_sout,
286 TGSI_WRITEMASK_XYZW,
287 TGSI_FILE_TEMPORARY, ts->point_pos_tmp);
288 }
289
290 /**
291 * Set up the point scale vector
292 * scale = pointSize * pos.w * inverseViewport
293 */
294
295 /* MUL point_scale.x, point_size.x, point_pos.w */
296 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_MUL,
297 TGSI_FILE_TEMPORARY, ts->point_scale_tmp, TGSI_WRITEMASK_X,
298 TGSI_FILE_TEMPORARY, ts->point_size_tmp, TGSI_SWIZZLE_X,
299 TGSI_FILE_TEMPORARY, ts->point_pos_tmp, TGSI_SWIZZLE_W, false);
300
301 /* MUL point_scale.xy, point_scale.xx, inverseViewport.xy */
302 inst = tgsi_default_full_instruction();
303 inst.Instruction.Opcode = TGSI_OPCODE_MUL;
304 inst.Instruction.NumDstRegs = 1;
305 tgsi_transform_dst_reg(&inst.Dst[0], TGSI_FILE_TEMPORARY,
306 ts->point_scale_tmp, TGSI_WRITEMASK_XY);
307 inst.Instruction.NumSrcRegs = 2;
308 tgsi_transform_src_reg(&inst.Src[0], TGSI_FILE_TEMPORARY,
309 ts->point_scale_tmp, TGSI_SWIZZLE_X,
310 TGSI_SWIZZLE_X, TGSI_SWIZZLE_X, TGSI_SWIZZLE_X);
311 tgsi_transform_src_reg(&inst.Src[1], TGSI_FILE_CONSTANT,
312 ts->point_ivp, TGSI_SWIZZLE_X,
313 TGSI_SWIZZLE_Y, TGSI_SWIZZLE_Z, TGSI_SWIZZLE_Z);
314 ctx->emit_instruction(ctx, &inst);
315
316 /**
317 * Set up the point coord threshold distance
318 * k = 0.5 - 1 / pointsize
319 */
320 if (ts->aa_point) {
321 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_DIV,
322 TGSI_FILE_TEMPORARY, ts->point_coord_k,
323 TGSI_WRITEMASK_X,
324 TGSI_FILE_IMMEDIATE, ts->point_imm,
325 TGSI_SWIZZLE_Y,
326 TGSI_FILE_TEMPORARY, ts->point_size_tmp,
327 TGSI_SWIZZLE_X, false);
328
329 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_ADD,
330 TGSI_FILE_TEMPORARY, ts->point_coord_k,
331 TGSI_WRITEMASK_X,
332 TGSI_FILE_IMMEDIATE, ts->point_imm,
333 TGSI_SWIZZLE_Z,
334 TGSI_FILE_TEMPORARY, ts->point_coord_k,
335 TGSI_SWIZZLE_X, true);
336 }
337
338
339 for (i = 0; i < 4; i++) {
340 unsigned point_dir_swz = ts->point_dir_swz[i];
341 unsigned point_coord_swz = ts->point_coord_swz[i];
342
343 /* All outputs need to be emitted for each vertex */
344 for (j = 0; j < ts->num_orig_out; j++) {
345 if (ts->out_tmp_index[j] != INVALID_INDEX) {
346 tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV,
347 TGSI_FILE_OUTPUT, j,
348 TGSI_WRITEMASK_XYZW,
349 TGSI_FILE_TEMPORARY, ts->out_tmp_index[j]);
350 }
351 }
352
353 /* pos = point_scale * point_dir + point_pos */
354 inst = tgsi_default_full_instruction();
355 inst.Instruction.Opcode = TGSI_OPCODE_MAD;
356 inst.Instruction.NumDstRegs = 1;
357 tgsi_transform_dst_reg(&inst.Dst[0], TGSI_FILE_OUTPUT, ts->point_pos_out,
358 TGSI_WRITEMASK_XYZW);
359 inst.Instruction.NumSrcRegs = 3;
360 tgsi_transform_src_reg(&inst.Src[0], TGSI_FILE_TEMPORARY, ts->point_scale_tmp,
361 TGSI_SWIZZLE_X, TGSI_SWIZZLE_Y, TGSI_SWIZZLE_X,
362 TGSI_SWIZZLE_X);
363 tgsi_transform_src_reg(&inst.Src[1], TGSI_FILE_IMMEDIATE, ts->point_imm,
364 get_swizzle(point_dir_swz, 0),
365 get_swizzle(point_dir_swz, 1),
366 get_swizzle(point_dir_swz, 2),
367 get_swizzle(point_dir_swz, 3));
368 tgsi_transform_src_reg(&inst.Src[2], TGSI_FILE_TEMPORARY, ts->point_pos_tmp,
369 TGSI_SWIZZLE_X, TGSI_SWIZZLE_Y, TGSI_SWIZZLE_Z,
370 TGSI_SWIZZLE_W);
371 ctx->emit_instruction(ctx, &inst);
372
373 /* point coord */
374 for (j = 0, s = 0, en = point_coord_enable; en; en>>=1, s++) {
375 unsigned dstReg;
376
377 if (en & 0x1) {
378 dstReg = ts->point_coord_out + j;
379
380 inst = tgsi_default_full_instruction();
381 inst.Instruction.Opcode = TGSI_OPCODE_MOV;
382 inst.Instruction.NumDstRegs = 1;
383 tgsi_transform_dst_reg(&inst.Dst[0], TGSI_FILE_OUTPUT,
384 dstReg, TGSI_WRITEMASK_XYZW);
385 inst.Instruction.NumSrcRegs = 1;
386 tgsi_transform_src_reg(&inst.Src[0], TGSI_FILE_IMMEDIATE, ts->point_imm,
387 get_swizzle(point_coord_swz, 0),
388 get_swizzle(point_coord_swz, 1),
389 get_swizzle(point_coord_swz, 2),
390 get_swizzle(point_coord_swz, 3));
391 ctx->emit_instruction(ctx, &inst);
392
393 /* MOV point_coord.z point_coord_k.x */
394 if (s == ts->point_coord_aa) {
395 tgsi_transform_op1_swz_inst(ctx, TGSI_OPCODE_MOV,
396 TGSI_FILE_OUTPUT, dstReg, TGSI_WRITEMASK_Z,
397 TGSI_FILE_TEMPORARY, ts->point_coord_k,
398 TGSI_SWIZZLE_X);
399 }
400 j++; /* the next point coord output offset */
401 }
402 }
403
404 /* Emit the EMIT instruction for each vertex of the quad */
405 ctx->emit_instruction(ctx, vert_inst);
406 }
407
408 /* Emit the ENDPRIM instruction for the quad */
409 inst = tgsi_default_full_instruction();
410 inst.Instruction.Opcode = TGSI_OPCODE_ENDPRIM;
411 inst.Instruction.NumDstRegs = 0;
412 inst.Instruction.NumSrcRegs = 1;
413 inst.Src[0] = vert_inst->Src[0];
414 ctx->emit_instruction(ctx, &inst);
415 }
416
417
418 /**
419 * TGSI instruction transform callback.
420 */
421 static void
psprite_inst(struct tgsi_transform_context * ctx,struct tgsi_full_instruction * inst)422 psprite_inst(struct tgsi_transform_context *ctx,
423 struct tgsi_full_instruction *inst)
424 {
425 struct psprite_transform_context *ts = psprite_transform_context(ctx);
426
427 if (inst->Instruction.Opcode == TGSI_OPCODE_EMIT) {
428 psprite_emit_vertex_inst(ctx, inst);
429 }
430 else if (inst->Dst[0].Register.File == TGSI_FILE_OUTPUT &&
431 inst->Dst[0].Register.Index == (int)ts->point_size_out) {
432 /**
433 * Replace point size output reg with tmp reg.
434 * The tmp reg will be later used as a src reg for computing
435 * the point scale factor.
436 */
437 inst->Dst[0].Register.File = TGSI_FILE_TEMPORARY;
438 inst->Dst[0].Register.Index = ts->point_size_tmp;
439 ctx->emit_instruction(ctx, inst);
440
441 /* Clamp the point size */
442 /* MAX point_size_tmp.x, point_size_tmp.x, point_imm.y */
443 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_MAX,
444 TGSI_FILE_TEMPORARY, ts->point_size_tmp, TGSI_WRITEMASK_X,
445 TGSI_FILE_TEMPORARY, ts->point_size_tmp, TGSI_SWIZZLE_X,
446 TGSI_FILE_IMMEDIATE, ts->point_imm, TGSI_SWIZZLE_Y, false);
447
448 /* MIN point_size_tmp.x, point_size_tmp.x, point_ivp.w */
449 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_MIN,
450 TGSI_FILE_TEMPORARY, ts->point_size_tmp, TGSI_WRITEMASK_X,
451 TGSI_FILE_TEMPORARY, ts->point_size_tmp, TGSI_SWIZZLE_X,
452 TGSI_FILE_CONSTANT, ts->point_ivp, TGSI_SWIZZLE_W, false);
453 }
454 else if (inst->Dst[0].Register.File == TGSI_FILE_OUTPUT &&
455 inst->Dst[0].Register.Index == (int)ts->point_pos_out) {
456 /**
457 * Replace point pos output reg with tmp reg.
458 */
459 inst->Dst[0].Register.File = TGSI_FILE_TEMPORARY;
460 inst->Dst[0].Register.Index = ts->point_pos_tmp;
461 ctx->emit_instruction(ctx, inst);
462 }
463 else if (inst->Dst[0].Register.File == TGSI_FILE_OUTPUT) {
464 /**
465 * Replace output reg with tmp reg.
466 */
467 inst->Dst[0].Register.File = TGSI_FILE_TEMPORARY;
468 inst->Dst[0].Register.Index = ts->out_tmp_index[inst->Dst[0].Register.Index];
469 ctx->emit_instruction(ctx, inst);
470 }
471 else {
472 ctx->emit_instruction(ctx, inst);
473 }
474 }
475
476
477 /**
478 * TGSI property instruction transform callback.
479 * Transforms a point into a 4-vertex triangle strip.
480 */
481 static void
psprite_property(struct tgsi_transform_context * ctx,struct tgsi_full_property * prop)482 psprite_property(struct tgsi_transform_context *ctx,
483 struct tgsi_full_property *prop)
484 {
485 switch (prop->Property.PropertyName) {
486 case TGSI_PROPERTY_GS_OUTPUT_PRIM:
487 prop->u[0].Data = PIPE_PRIM_TRIANGLE_STRIP;
488 break;
489 case TGSI_PROPERTY_GS_MAX_OUTPUT_VERTICES:
490 prop->u[0].Data *= 4;
491 break;
492 default:
493 break;
494 }
495 ctx->emit_property(ctx, prop);
496 }
497
498 /**
499 * TGSI utility to transform a geometry shader to support point sprite.
500 */
501 struct tgsi_token *
tgsi_add_point_sprite(const struct tgsi_token * tokens_in,const unsigned point_coord_enable,const bool sprite_origin_lower_left,const bool stream_out_point_pos,int * aa_point_coord_index)502 tgsi_add_point_sprite(const struct tgsi_token *tokens_in,
503 const unsigned point_coord_enable,
504 const bool sprite_origin_lower_left,
505 const bool stream_out_point_pos,
506 int *aa_point_coord_index)
507 {
508 struct psprite_transform_context transform;
509 const uint num_new_tokens = 200; /* should be enough */
510 const uint new_len = tgsi_num_tokens(tokens_in) + num_new_tokens;
511 struct tgsi_token *new_tokens;
512
513 /* setup transformation context */
514 memset(&transform, 0, sizeof(transform));
515 transform.base.transform_declaration = psprite_decl;
516 transform.base.transform_instruction = psprite_inst;
517 transform.base.transform_property = psprite_property;
518 transform.base.transform_immediate = psprite_immediate;
519 transform.base.prolog = psprite_prolog;
520
521 transform.point_size_in = INVALID_INDEX;
522 transform.point_size_out = INVALID_INDEX;
523 transform.point_size_tmp = INVALID_INDEX;
524 transform.point_pos_in = INVALID_INDEX;
525 transform.point_pos_out = INVALID_INDEX;
526 transform.point_pos_sout = INVALID_INDEX;
527 transform.point_pos_tmp = INVALID_INDEX;
528 transform.point_scale_tmp = INVALID_INDEX;
529 transform.point_imm = INVALID_INDEX;
530 transform.point_coord_aa = INVALID_INDEX;
531 transform.point_coord_k = INVALID_INDEX;
532
533 transform.stream_out_point_pos = stream_out_point_pos;
534 transform.point_coord_enable = point_coord_enable;
535 transform.aa_point = aa_point_coord_index != NULL;
536 transform.max_generic = -1;
537
538 /* point sprite directions based on the immediates (0, 1, 0.5, -1) */
539 /* (-1, -1, 0, 0) */
540 transform.point_dir_swz[0] = set_swizzle(-1, -1, 0, 0);
541 /* (-1, 1, 0, 0) */
542 transform.point_dir_swz[1] = set_swizzle(-1, 1, 0, 0);
543 /* (1, -1, 0, 0) */
544 transform.point_dir_swz[2] = set_swizzle(1, -1, 0, 0);
545 /* (1, 1, 0, 0) */
546 transform.point_dir_swz[3] = set_swizzle(1, 1, 0, 0);
547
548 /* point coord based on the immediates (0, 1, 0, -1) */
549 if (sprite_origin_lower_left) {
550 /* (0, 0, 0, 1) */
551 transform.point_coord_swz[0] = set_swizzle(0, 0, 0, 1);
552 /* (0, 1, 0, 1) */
553 transform.point_coord_swz[1] = set_swizzle(0, 1, 0, 1);
554 /* (1, 0, 0, 1) */
555 transform.point_coord_swz[2] = set_swizzle(1, 0, 0, 1);
556 /* (1, 1, 0, 1) */
557 transform.point_coord_swz[3] = set_swizzle(1, 1, 0, 1);
558 }
559 else {
560 /* (0, 1, 0, 1) */
561 transform.point_coord_swz[0] = set_swizzle(0, 1, 0, 1);
562 /* (0, 0, 0, 1) */
563 transform.point_coord_swz[1] = set_swizzle(0, 0, 0, 1);
564 /* (1, 1, 0, 1) */
565 transform.point_coord_swz[2] = set_swizzle(1, 1, 0, 1);
566 /* (1, 0, 0, 1) */
567 transform.point_coord_swz[3] = set_swizzle(1, 0, 0, 1);
568 }
569
570
571 /* allocate new tokens buffer */
572 new_tokens = tgsi_alloc_tokens(new_len);
573 if (!new_tokens)
574 return NULL;
575
576 /* transform the shader */
577 tgsi_transform_shader(tokens_in, new_tokens, new_len, &transform.base);
578
579 if (aa_point_coord_index)
580 *aa_point_coord_index = transform.point_coord_aa;
581
582 return new_tokens;
583 }
584