1 /**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 /**
29 * AA line stage: AA lines are converted to texture mapped triangles.
30 *
31 * Authors: Brian Paul
32 */
33
34
35 #include "pipe/p_context.h"
36 #include "pipe/p_defines.h"
37 #include "pipe/p_shader_tokens.h"
38 #include "util/u_inlines.h"
39
40 #include "util/u_format.h"
41 #include "util/u_math.h"
42 #include "util/u_memory.h"
43 #include "util/u_sampler.h"
44
45 #include "tgsi/tgsi_transform.h"
46 #include "tgsi/tgsi_dump.h"
47
48 #include "draw_context.h"
49 #include "draw_private.h"
50 #include "draw_pipe.h"
51
52
53 /** Approx number of new tokens for instructions in aa_transform_inst() */
54 #define NUM_NEW_TOKENS 50
55
56
57 /**
58 * Size for the alpha texture used for antialiasing
59 */
60 #define TEXTURE_SIZE_LOG2 5 /* 32 x 32 */
61
62 /**
63 * Max texture level for the alpha texture used for antialiasing
64 *
65 * Don't use the 1x1 and 2x2 mipmap levels.
66 */
67 #define MAX_TEXTURE_LEVEL (TEXTURE_SIZE_LOG2 - 2)
68
69
70 /**
71 * Subclass of pipe_shader_state to carry extra fragment shader info.
72 */
73 struct aaline_fragment_shader
74 {
75 struct pipe_shader_state state;
76 void *driver_fs;
77 void *aaline_fs;
78 uint sampler_unit;
79 int generic_attrib; /**< texcoord/generic used for texture */
80 };
81
82
83 /**
84 * Subclass of draw_stage
85 */
86 struct aaline_stage
87 {
88 struct draw_stage stage;
89
90 float half_line_width;
91
92 /** For AA lines, this is the vertex attrib slot for the new texcoords */
93 uint tex_slot;
94 /** position, not necessarily output zero */
95 uint pos_slot;
96
97 void *sampler_cso;
98 struct pipe_resource *texture;
99 struct pipe_sampler_view *sampler_view;
100 uint num_samplers;
101 uint num_sampler_views;
102
103
104 /*
105 * Currently bound state
106 */
107 struct aaline_fragment_shader *fs;
108 struct {
109 void *sampler[PIPE_MAX_SAMPLERS];
110 struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
111 } state;
112
113 /*
114 * Driver interface/override functions
115 */
116 void * (*driver_create_fs_state)(struct pipe_context *,
117 const struct pipe_shader_state *);
118 void (*driver_bind_fs_state)(struct pipe_context *, void *);
119 void (*driver_delete_fs_state)(struct pipe_context *, void *);
120
121 void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
122 void **);
123
124 void (*driver_set_sampler_views)(struct pipe_context *,
125 unsigned,
126 struct pipe_sampler_view **);
127 };
128
129
130
131 /**
132 * Subclass of tgsi_transform_context, used for transforming the
133 * user's fragment shader to add the special AA instructions.
134 */
135 struct aa_transform_context {
136 struct tgsi_transform_context base;
137 uint tempsUsed; /**< bitmask */
138 int colorOutput; /**< which output is the primary color */
139 uint samplersUsed; /**< bitfield of samplers used */
140 int freeSampler; /** an available sampler for the pstipple */
141 int maxInput, maxGeneric; /**< max input index found */
142 int colorTemp, texTemp; /**< temp registers */
143 boolean firstInstruction;
144 };
145
146
147 /**
148 * TGSI declaration transform callback.
149 * Look for a free sampler, a free input attrib, and two free temp regs.
150 */
151 static void
aa_transform_decl(struct tgsi_transform_context * ctx,struct tgsi_full_declaration * decl)152 aa_transform_decl(struct tgsi_transform_context *ctx,
153 struct tgsi_full_declaration *decl)
154 {
155 struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
156
157 if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
158 decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
159 decl->Semantic.Index == 0) {
160 aactx->colorOutput = decl->Range.First;
161 }
162 else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
163 uint i;
164 for (i = decl->Range.First;
165 i <= decl->Range.Last; i++) {
166 aactx->samplersUsed |= 1 << i;
167 }
168 }
169 else if (decl->Declaration.File == TGSI_FILE_INPUT) {
170 if ((int) decl->Range.Last > aactx->maxInput)
171 aactx->maxInput = decl->Range.Last;
172 if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
173 (int) decl->Semantic.Index > aactx->maxGeneric) {
174 aactx->maxGeneric = decl->Semantic.Index;
175 }
176 }
177 else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
178 uint i;
179 for (i = decl->Range.First;
180 i <= decl->Range.Last; i++) {
181 aactx->tempsUsed |= (1 << i);
182 }
183 }
184
185 ctx->emit_declaration(ctx, decl);
186 }
187
188
189 /**
190 * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
191 */
192 static int
free_bit(uint bitfield)193 free_bit(uint bitfield)
194 {
195 return ffs(~bitfield) - 1;
196 }
197
198
199 /**
200 * TGSI instruction transform callback.
201 * Replace writes to result.color w/ a temp reg.
202 * Upon END instruction, insert texture sampling code for antialiasing.
203 */
204 static void
aa_transform_inst(struct tgsi_transform_context * ctx,struct tgsi_full_instruction * inst)205 aa_transform_inst(struct tgsi_transform_context *ctx,
206 struct tgsi_full_instruction *inst)
207 {
208 struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
209
210 if (aactx->firstInstruction) {
211 /* emit our new declarations before the first instruction */
212
213 struct tgsi_full_declaration decl;
214 uint i;
215
216 /* find free sampler */
217 aactx->freeSampler = free_bit(aactx->samplersUsed);
218 if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
219 aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
220
221 /* find two free temp regs */
222 for (i = 0; i < 32; i++) {
223 if ((aactx->tempsUsed & (1 << i)) == 0) {
224 /* found a free temp */
225 if (aactx->colorTemp < 0)
226 aactx->colorTemp = i;
227 else if (aactx->texTemp < 0)
228 aactx->texTemp = i;
229 else
230 break;
231 }
232 }
233 assert(aactx->colorTemp >= 0);
234 assert(aactx->texTemp >= 0);
235
236 /* declare new generic input/texcoord */
237 decl = tgsi_default_full_declaration();
238 decl.Declaration.File = TGSI_FILE_INPUT;
239 /* XXX this could be linear... */
240 decl.Declaration.Interpolate = 1;
241 decl.Declaration.Semantic = 1;
242 decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
243 decl.Semantic.Index = aactx->maxGeneric + 1;
244 decl.Range.First =
245 decl.Range.Last = aactx->maxInput + 1;
246 decl.Interp.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
247 ctx->emit_declaration(ctx, &decl);
248
249 /* declare new sampler */
250 decl = tgsi_default_full_declaration();
251 decl.Declaration.File = TGSI_FILE_SAMPLER;
252 decl.Range.First =
253 decl.Range.Last = aactx->freeSampler;
254 ctx->emit_declaration(ctx, &decl);
255
256 /* declare new temp regs */
257 decl = tgsi_default_full_declaration();
258 decl.Declaration.File = TGSI_FILE_TEMPORARY;
259 decl.Range.First =
260 decl.Range.Last = aactx->texTemp;
261 ctx->emit_declaration(ctx, &decl);
262
263 decl = tgsi_default_full_declaration();
264 decl.Declaration.File = TGSI_FILE_TEMPORARY;
265 decl.Range.First =
266 decl.Range.Last = aactx->colorTemp;
267 ctx->emit_declaration(ctx, &decl);
268
269 aactx->firstInstruction = FALSE;
270 }
271
272 if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
273 aactx->colorOutput != -1) {
274 struct tgsi_full_instruction newInst;
275
276 /* TEX */
277 newInst = tgsi_default_full_instruction();
278 newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
279 newInst.Instruction.NumDstRegs = 1;
280 newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
281 newInst.Dst[0].Register.Index = aactx->texTemp;
282 newInst.Instruction.NumSrcRegs = 2;
283 newInst.Instruction.Texture = TRUE;
284 newInst.Texture.Texture = TGSI_TEXTURE_2D;
285 newInst.Src[0].Register.File = TGSI_FILE_INPUT;
286 newInst.Src[0].Register.Index = aactx->maxInput + 1;
287 newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
288 newInst.Src[1].Register.Index = aactx->freeSampler;
289
290 ctx->emit_instruction(ctx, &newInst);
291
292 /* MOV rgb */
293 newInst = tgsi_default_full_instruction();
294 newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
295 newInst.Instruction.NumDstRegs = 1;
296 newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
297 newInst.Dst[0].Register.Index = aactx->colorOutput;
298 newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZ;
299 newInst.Instruction.NumSrcRegs = 1;
300 newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
301 newInst.Src[0].Register.Index = aactx->colorTemp;
302 ctx->emit_instruction(ctx, &newInst);
303
304 /* MUL alpha */
305 newInst = tgsi_default_full_instruction();
306 newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
307 newInst.Instruction.NumDstRegs = 1;
308 newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
309 newInst.Dst[0].Register.Index = aactx->colorOutput;
310 newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_W;
311 newInst.Instruction.NumSrcRegs = 2;
312 newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
313 newInst.Src[0].Register.Index = aactx->colorTemp;
314 newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
315 newInst.Src[1].Register.Index = aactx->texTemp;
316 ctx->emit_instruction(ctx, &newInst);
317
318 /* END */
319 newInst = tgsi_default_full_instruction();
320 newInst.Instruction.Opcode = TGSI_OPCODE_END;
321 newInst.Instruction.NumDstRegs = 0;
322 newInst.Instruction.NumSrcRegs = 0;
323 ctx->emit_instruction(ctx, &newInst);
324 }
325 else {
326 /* Not an END instruction.
327 * Look for writes to result.color and replace with colorTemp reg.
328 */
329 uint i;
330
331 for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
332 struct tgsi_full_dst_register *dst = &inst->Dst[i];
333 if (dst->Register.File == TGSI_FILE_OUTPUT &&
334 dst->Register.Index == aactx->colorOutput) {
335 dst->Register.File = TGSI_FILE_TEMPORARY;
336 dst->Register.Index = aactx->colorTemp;
337 }
338 }
339
340 ctx->emit_instruction(ctx, inst);
341 }
342 }
343
344
345 /**
346 * Generate the frag shader we'll use for drawing AA lines.
347 * This will be the user's shader plus some texture/modulate instructions.
348 */
349 static boolean
generate_aaline_fs(struct aaline_stage * aaline)350 generate_aaline_fs(struct aaline_stage *aaline)
351 {
352 struct pipe_context *pipe = aaline->stage.draw->pipe;
353 const struct pipe_shader_state *orig_fs = &aaline->fs->state;
354 struct pipe_shader_state aaline_fs;
355 struct aa_transform_context transform;
356 const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
357
358 aaline_fs = *orig_fs; /* copy to init */
359 aaline_fs.tokens = tgsi_alloc_tokens(newLen);
360 if (aaline_fs.tokens == NULL)
361 return FALSE;
362
363 memset(&transform, 0, sizeof(transform));
364 transform.colorOutput = -1;
365 transform.maxInput = -1;
366 transform.maxGeneric = -1;
367 transform.colorTemp = -1;
368 transform.texTemp = -1;
369 transform.firstInstruction = TRUE;
370 transform.base.transform_instruction = aa_transform_inst;
371 transform.base.transform_declaration = aa_transform_decl;
372
373 tgsi_transform_shader(orig_fs->tokens,
374 (struct tgsi_token *) aaline_fs.tokens,
375 newLen, &transform.base);
376
377 #if 0 /* DEBUG */
378 debug_printf("draw_aaline, orig shader:\n");
379 tgsi_dump(orig_fs->tokens, 0);
380 debug_printf("draw_aaline, new shader:\n");
381 tgsi_dump(aaline_fs.tokens, 0);
382 #endif
383
384 aaline->fs->sampler_unit = transform.freeSampler;
385
386 aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
387 if (aaline->fs->aaline_fs == NULL)
388 goto fail;
389
390 aaline->fs->generic_attrib = transform.maxGeneric + 1;
391 FREE((void *)aaline_fs.tokens);
392 return TRUE;
393
394 fail:
395 FREE((void *)aaline_fs.tokens);
396 return FALSE;
397 }
398
399
400 /**
401 * Create the texture map we'll use for antialiasing the lines.
402 */
403 static boolean
aaline_create_texture(struct aaline_stage * aaline)404 aaline_create_texture(struct aaline_stage *aaline)
405 {
406 struct pipe_context *pipe = aaline->stage.draw->pipe;
407 struct pipe_screen *screen = pipe->screen;
408 struct pipe_resource texTemp;
409 struct pipe_sampler_view viewTempl;
410 uint level;
411
412 memset(&texTemp, 0, sizeof(texTemp));
413 texTemp.target = PIPE_TEXTURE_2D;
414 texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
415 texTemp.last_level = MAX_TEXTURE_LEVEL;
416 texTemp.width0 = 1 << TEXTURE_SIZE_LOG2;
417 texTemp.height0 = 1 << TEXTURE_SIZE_LOG2;
418 texTemp.depth0 = 1;
419 texTemp.array_size = 1;
420 texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
421
422 aaline->texture = screen->resource_create(screen, &texTemp);
423 if (!aaline->texture)
424 return FALSE;
425
426 u_sampler_view_default_template(&viewTempl,
427 aaline->texture,
428 aaline->texture->format);
429 aaline->sampler_view = pipe->create_sampler_view(pipe,
430 aaline->texture,
431 &viewTempl);
432 if (!aaline->sampler_view) {
433 return FALSE;
434 }
435
436 /* Fill in mipmap images.
437 * Basically each level is solid opaque, except for the outermost
438 * texels which are zero. Special case the 1x1 and 2x2 levels
439 * (though, those levels shouldn't be used - see the max_lod setting).
440 */
441 for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
442 struct pipe_transfer *transfer;
443 struct pipe_box box;
444 const uint size = u_minify(aaline->texture->width0, level);
445 ubyte *data;
446 uint i, j;
447
448 assert(aaline->texture->width0 == aaline->texture->height0);
449
450 u_box_origin_2d( size, size, &box );
451
452 /* This texture is new, no need to flush.
453 */
454 transfer = pipe->get_transfer(pipe,
455 aaline->texture,
456 level,
457 PIPE_TRANSFER_WRITE,
458 &box);
459
460 data = pipe->transfer_map(pipe, transfer);
461 if (data == NULL)
462 return FALSE;
463
464 for (i = 0; i < size; i++) {
465 for (j = 0; j < size; j++) {
466 ubyte d;
467 if (size == 1) {
468 d = 255;
469 }
470 else if (size == 2) {
471 d = 200; /* tuneable */
472 }
473 else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
474 d = 35; /* edge texel */
475 }
476 else {
477 d = 255;
478 }
479 data[i * transfer->stride + j] = d;
480 }
481 }
482
483 /* unmap */
484 pipe->transfer_unmap(pipe, transfer);
485 pipe->transfer_destroy(pipe, transfer);
486 }
487 return TRUE;
488 }
489
490
491 /**
492 * Create the sampler CSO that'll be used for antialiasing.
493 * By using a mipmapped texture, we don't have to generate a different
494 * texture image for each line size.
495 */
496 static boolean
aaline_create_sampler(struct aaline_stage * aaline)497 aaline_create_sampler(struct aaline_stage *aaline)
498 {
499 struct pipe_sampler_state sampler;
500 struct pipe_context *pipe = aaline->stage.draw->pipe;
501
502 memset(&sampler, 0, sizeof(sampler));
503 sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
504 sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
505 sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
506 sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
507 sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
508 sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
509 sampler.normalized_coords = 1;
510 sampler.min_lod = 0.0f;
511 sampler.max_lod = MAX_TEXTURE_LEVEL;
512
513 aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
514 if (aaline->sampler_cso == NULL)
515 return FALSE;
516
517 return TRUE;
518 }
519
520
521 /**
522 * When we're about to draw our first AA line in a batch, this function is
523 * called to tell the driver to bind our modified fragment shader.
524 */
525 static boolean
bind_aaline_fragment_shader(struct aaline_stage * aaline)526 bind_aaline_fragment_shader(struct aaline_stage *aaline)
527 {
528 struct draw_context *draw = aaline->stage.draw;
529 struct pipe_context *pipe = draw->pipe;
530
531 if (!aaline->fs->aaline_fs &&
532 !generate_aaline_fs(aaline))
533 return FALSE;
534
535 draw->suspend_flushing = TRUE;
536 aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
537 draw->suspend_flushing = FALSE;
538
539 return TRUE;
540 }
541
542
543
544 static INLINE struct aaline_stage *
aaline_stage(struct draw_stage * stage)545 aaline_stage( struct draw_stage *stage )
546 {
547 return (struct aaline_stage *) stage;
548 }
549
550
551 /**
552 * Draw a wide line by drawing a quad, using geometry which will
553 * fullfill GL's antialiased line requirements.
554 */
555 static void
aaline_line(struct draw_stage * stage,struct prim_header * header)556 aaline_line(struct draw_stage *stage, struct prim_header *header)
557 {
558 const struct aaline_stage *aaline = aaline_stage(stage);
559 const float half_width = aaline->half_line_width;
560 struct prim_header tri;
561 struct vertex_header *v[8];
562 uint texPos = aaline->tex_slot;
563 uint posPos = aaline->pos_slot;
564 float *pos, *tex;
565 float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
566 float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
567 double a = atan2(dy, dx);
568 float c_a = (float) cos(a), s_a = (float) sin(a);
569 uint i;
570
571 /* XXX the ends of lines aren't quite perfect yet, but probably passable */
572 dx = 0.5F * half_width;
573 dy = half_width;
574
575 /* allocate/dup new verts */
576 for (i = 0; i < 8; i++) {
577 v[i] = dup_vert(stage, header->v[i/4], i);
578 }
579
580 /*
581 * Quad strip for line from v0 to v1 (*=endpoints):
582 *
583 * 1 3 5 7
584 * +---+---------------------+---+
585 * | |
586 * | *v0 v1* |
587 * | |
588 * +---+---------------------+---+
589 * 0 2 4 6
590 */
591
592 /* new verts */
593 pos = v[0]->data[posPos];
594 pos[0] += (-dx * c_a - dy * s_a);
595 pos[1] += (-dx * s_a + dy * c_a);
596
597 pos = v[1]->data[posPos];
598 pos[0] += (-dx * c_a - -dy * s_a);
599 pos[1] += (-dx * s_a + -dy * c_a);
600
601 pos = v[2]->data[posPos];
602 pos[0] += ( dx * c_a - dy * s_a);
603 pos[1] += ( dx * s_a + dy * c_a);
604
605 pos = v[3]->data[posPos];
606 pos[0] += ( dx * c_a - -dy * s_a);
607 pos[1] += ( dx * s_a + -dy * c_a);
608
609 pos = v[4]->data[posPos];
610 pos[0] += (-dx * c_a - dy * s_a);
611 pos[1] += (-dx * s_a + dy * c_a);
612
613 pos = v[5]->data[posPos];
614 pos[0] += (-dx * c_a - -dy * s_a);
615 pos[1] += (-dx * s_a + -dy * c_a);
616
617 pos = v[6]->data[posPos];
618 pos[0] += ( dx * c_a - dy * s_a);
619 pos[1] += ( dx * s_a + dy * c_a);
620
621 pos = v[7]->data[posPos];
622 pos[0] += ( dx * c_a - -dy * s_a);
623 pos[1] += ( dx * s_a + -dy * c_a);
624
625 /* new texcoords */
626 tex = v[0]->data[texPos];
627 ASSIGN_4V(tex, 0, 0, 0, 1);
628
629 tex = v[1]->data[texPos];
630 ASSIGN_4V(tex, 0, 1, 0, 1);
631
632 tex = v[2]->data[texPos];
633 ASSIGN_4V(tex, .5, 0, 0, 1);
634
635 tex = v[3]->data[texPos];
636 ASSIGN_4V(tex, .5, 1, 0, 1);
637
638 tex = v[4]->data[texPos];
639 ASSIGN_4V(tex, .5, 0, 0, 1);
640
641 tex = v[5]->data[texPos];
642 ASSIGN_4V(tex, .5, 1, 0, 1);
643
644 tex = v[6]->data[texPos];
645 ASSIGN_4V(tex, 1, 0, 0, 1);
646
647 tex = v[7]->data[texPos];
648 ASSIGN_4V(tex, 1, 1, 0, 1);
649
650 /* emit 6 tris for the quad strip */
651 tri.v[0] = v[2]; tri.v[1] = v[1]; tri.v[2] = v[0];
652 stage->next->tri( stage->next, &tri );
653
654 tri.v[0] = v[3]; tri.v[1] = v[1]; tri.v[2] = v[2];
655 stage->next->tri( stage->next, &tri );
656
657 tri.v[0] = v[4]; tri.v[1] = v[3]; tri.v[2] = v[2];
658 stage->next->tri( stage->next, &tri );
659
660 tri.v[0] = v[5]; tri.v[1] = v[3]; tri.v[2] = v[4];
661 stage->next->tri( stage->next, &tri );
662
663 tri.v[0] = v[6]; tri.v[1] = v[5]; tri.v[2] = v[4];
664 stage->next->tri( stage->next, &tri );
665
666 tri.v[0] = v[7]; tri.v[1] = v[5]; tri.v[2] = v[6];
667 stage->next->tri( stage->next, &tri );
668 }
669
670
671 static void
aaline_first_line(struct draw_stage * stage,struct prim_header * header)672 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
673 {
674 auto struct aaline_stage *aaline = aaline_stage(stage);
675 struct draw_context *draw = stage->draw;
676 struct pipe_context *pipe = draw->pipe;
677 const struct pipe_rasterizer_state *rast = draw->rasterizer;
678 uint num_samplers;
679 void *r;
680
681 assert(draw->rasterizer->line_smooth);
682
683 if (draw->rasterizer->line_width <= 2.2)
684 aaline->half_line_width = 1.1f;
685 else
686 aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
687
688 /*
689 * Bind (generate) our fragprog, sampler and texture
690 */
691 if (!bind_aaline_fragment_shader(aaline)) {
692 stage->line = draw_pipe_passthrough_line;
693 stage->line(stage, header);
694 return;
695 }
696
697 /* update vertex attrib info */
698 aaline->pos_slot = draw_current_shader_position_output(draw);;
699
700 /* allocate the extra post-transformed vertex attribute */
701 aaline->tex_slot = draw_alloc_extra_vertex_attrib(draw,
702 TGSI_SEMANTIC_GENERIC,
703 aaline->fs->generic_attrib);
704
705 /* how many samplers? */
706 /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
707 num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
708 num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
709
710 aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
711 pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
712 aaline->sampler_view);
713
714 draw->suspend_flushing = TRUE;
715 aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
716 aaline->driver_set_sampler_views(pipe, num_samplers, aaline->state.sampler_views);
717
718 /* Disable triangle culling, stippling, unfilled mode etc. */
719 r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
720 pipe->bind_rasterizer_state(pipe, r);
721
722 draw->suspend_flushing = FALSE;
723
724 /* now really draw first line */
725 stage->line = aaline_line;
726 stage->line(stage, header);
727 }
728
729
730 static void
aaline_flush(struct draw_stage * stage,unsigned flags)731 aaline_flush(struct draw_stage *stage, unsigned flags)
732 {
733 struct draw_context *draw = stage->draw;
734 struct aaline_stage *aaline = aaline_stage(stage);
735 struct pipe_context *pipe = draw->pipe;
736
737 stage->line = aaline_first_line;
738 stage->next->flush( stage->next, flags );
739
740 /* restore original frag shader, texture, sampler state */
741 draw->suspend_flushing = TRUE;
742 aaline->driver_bind_fs_state(pipe, aaline->fs ? aaline->fs->driver_fs : NULL);
743 aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
744 aaline->state.sampler);
745 aaline->driver_set_sampler_views(pipe,
746 aaline->num_sampler_views,
747 aaline->state.sampler_views);
748
749 /* restore original rasterizer state */
750 if (draw->rast_handle) {
751 pipe->bind_rasterizer_state(pipe, draw->rast_handle);
752 }
753
754 draw->suspend_flushing = FALSE;
755
756 draw_remove_extra_vertex_attribs(draw);
757 }
758
759
760 static void
aaline_reset_stipple_counter(struct draw_stage * stage)761 aaline_reset_stipple_counter(struct draw_stage *stage)
762 {
763 stage->next->reset_stipple_counter( stage->next );
764 }
765
766
767 static void
aaline_destroy(struct draw_stage * stage)768 aaline_destroy(struct draw_stage *stage)
769 {
770 struct aaline_stage *aaline = aaline_stage(stage);
771 struct pipe_context *pipe = stage->draw->pipe;
772 uint i;
773
774 for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
775 pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
776 }
777
778 if (aaline->sampler_cso)
779 pipe->delete_sampler_state(pipe, aaline->sampler_cso);
780
781 if (aaline->texture)
782 pipe_resource_reference(&aaline->texture, NULL);
783
784 if (aaline->sampler_view) {
785 pipe_sampler_view_reference(&aaline->sampler_view, NULL);
786 }
787
788 draw_free_temp_verts( stage );
789
790 /* restore the old entry points */
791 pipe->create_fs_state = aaline->driver_create_fs_state;
792 pipe->bind_fs_state = aaline->driver_bind_fs_state;
793 pipe->delete_fs_state = aaline->driver_delete_fs_state;
794
795 pipe->bind_fragment_sampler_states = aaline->driver_bind_sampler_states;
796 pipe->set_fragment_sampler_views = aaline->driver_set_sampler_views;
797
798 FREE( stage );
799 }
800
801
802 static struct aaline_stage *
draw_aaline_stage(struct draw_context * draw)803 draw_aaline_stage(struct draw_context *draw)
804 {
805 struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
806 if (aaline == NULL)
807 return NULL;
808
809 aaline->stage.draw = draw;
810 aaline->stage.name = "aaline";
811 aaline->stage.next = NULL;
812 aaline->stage.point = draw_pipe_passthrough_point;
813 aaline->stage.line = aaline_first_line;
814 aaline->stage.tri = draw_pipe_passthrough_tri;
815 aaline->stage.flush = aaline_flush;
816 aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
817 aaline->stage.destroy = aaline_destroy;
818
819 if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
820 goto fail;
821
822 return aaline;
823
824 fail:
825 if (aaline)
826 aaline->stage.destroy(&aaline->stage);
827
828 return NULL;
829 }
830
831
832 static struct aaline_stage *
aaline_stage_from_pipe(struct pipe_context * pipe)833 aaline_stage_from_pipe(struct pipe_context *pipe)
834 {
835 struct draw_context *draw = (struct draw_context *) pipe->draw;
836 return aaline_stage(draw->pipeline.aaline);
837 }
838
839
840 /**
841 * This function overrides the driver's create_fs_state() function and
842 * will typically be called by the state tracker.
843 */
844 static void *
aaline_create_fs_state(struct pipe_context * pipe,const struct pipe_shader_state * fs)845 aaline_create_fs_state(struct pipe_context *pipe,
846 const struct pipe_shader_state *fs)
847 {
848 struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
849 struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
850
851 if (aafs == NULL)
852 return NULL;
853
854 aafs->state.tokens = tgsi_dup_tokens(fs->tokens);
855
856 /* pass-through */
857 aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
858
859 return aafs;
860 }
861
862
863 static void
aaline_bind_fs_state(struct pipe_context * pipe,void * fs)864 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
865 {
866 struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
867 struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
868
869 /* save current */
870 aaline->fs = aafs;
871 /* pass-through */
872 aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
873 }
874
875
876 static void
aaline_delete_fs_state(struct pipe_context * pipe,void * fs)877 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
878 {
879 struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
880 struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
881
882 /* pass-through */
883 aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
884
885 if (aafs->aaline_fs)
886 aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
887
888 FREE((void*)aafs->state.tokens);
889
890 FREE(aafs);
891 }
892
893
894 static void
aaline_bind_sampler_states(struct pipe_context * pipe,unsigned num,void ** sampler)895 aaline_bind_sampler_states(struct pipe_context *pipe,
896 unsigned num, void **sampler)
897 {
898 struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
899
900 /* save current */
901 memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
902 aaline->num_samplers = num;
903
904 /* pass-through */
905 aaline->driver_bind_sampler_states(pipe, num, sampler);
906 }
907
908
909 static void
aaline_set_sampler_views(struct pipe_context * pipe,unsigned num,struct pipe_sampler_view ** views)910 aaline_set_sampler_views(struct pipe_context *pipe,
911 unsigned num,
912 struct pipe_sampler_view **views)
913 {
914 struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
915 uint i;
916
917 /* save current */
918 for (i = 0; i < num; i++) {
919 pipe_sampler_view_reference(&aaline->state.sampler_views[i], views[i]);
920 }
921 for ( ; i < PIPE_MAX_SAMPLERS; i++) {
922 pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
923 }
924 aaline->num_sampler_views = num;
925
926 /* pass-through */
927 aaline->driver_set_sampler_views(pipe, num, views);
928 }
929
930
931 /**
932 * Called by drivers that want to install this AA line prim stage
933 * into the draw module's pipeline. This will not be used if the
934 * hardware has native support for AA lines.
935 */
936 boolean
draw_install_aaline_stage(struct draw_context * draw,struct pipe_context * pipe)937 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
938 {
939 struct aaline_stage *aaline;
940
941 pipe->draw = (void *) draw;
942
943 /*
944 * Create / install AA line drawing / prim stage
945 */
946 aaline = draw_aaline_stage( draw );
947 if (!aaline)
948 goto fail;
949
950 /* create special texture, sampler state */
951 if (!aaline_create_texture(aaline))
952 goto fail;
953
954 if (!aaline_create_sampler(aaline))
955 goto fail;
956
957 /* save original driver functions */
958 aaline->driver_create_fs_state = pipe->create_fs_state;
959 aaline->driver_bind_fs_state = pipe->bind_fs_state;
960 aaline->driver_delete_fs_state = pipe->delete_fs_state;
961
962 aaline->driver_bind_sampler_states = pipe->bind_fragment_sampler_states;
963 aaline->driver_set_sampler_views = pipe->set_fragment_sampler_views;
964
965 /* override the driver's functions */
966 pipe->create_fs_state = aaline_create_fs_state;
967 pipe->bind_fs_state = aaline_bind_fs_state;
968 pipe->delete_fs_state = aaline_delete_fs_state;
969
970 pipe->bind_fragment_sampler_states = aaline_bind_sampler_states;
971 pipe->set_fragment_sampler_views = aaline_set_sampler_views;
972
973 /* Install once everything is known to be OK:
974 */
975 draw->pipeline.aaline = &aaline->stage;
976
977 return TRUE;
978
979 fail:
980 if (aaline)
981 aaline->stage.destroy( &aaline->stage );
982
983 return FALSE;
984 }
985