1/**************************************************************************
2 *
3 * Copyright 2007-2018 VMware, Inc.
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 VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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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 triangles (with extra generic)
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/format/u_format.h"
41#include "util/u_math.h"
42#include "util/u_memory.h"
43
44#include "tgsi/tgsi_transform.h"
45#include "tgsi/tgsi_dump.h"
46
47#include "draw_context.h"
48#include "draw_private.h"
49#include "draw_pipe.h"
50
51#include "nir.h"
52#include "nir/nir_draw_helpers.h"
53
54/** Approx number of new tokens for instructions in aa_transform_inst() */
55#define NUM_NEW_TOKENS 53
56
57
58/**
59 * Subclass of pipe_shader_state to carry extra fragment shader info.
60 */
61struct aaline_fragment_shader
62{
63   struct pipe_shader_state state;
64   void *driver_fs;
65   void *aaline_fs;
66   int generic_attrib;  /**< generic used for distance */
67};
68
69
70/**
71 * Subclass of draw_stage
72 */
73struct aaline_stage
74{
75   struct draw_stage stage;
76
77   float half_line_width;
78
79   /** For AA lines, this is the vertex attrib slot for new generic */
80   uint coord_slot;
81   /** position, not necessarily output zero */
82   uint pos_slot;
83
84
85   /*
86    * Currently bound state
87    */
88   struct aaline_fragment_shader *fs;
89
90   /*
91    * Driver interface/override functions
92    */
93   void * (*driver_create_fs_state)(struct pipe_context *,
94                                    const struct pipe_shader_state *);
95   void (*driver_bind_fs_state)(struct pipe_context *, void *);
96   void (*driver_delete_fs_state)(struct pipe_context *, void *);
97};
98
99
100
101/**
102 * Subclass of tgsi_transform_context, used for transforming the
103 * user's fragment shader to add the special AA instructions.
104 */
105struct aa_transform_context {
106   struct tgsi_transform_context base;
107   uint64_t tempsUsed;  /**< bitmask */
108   int colorOutput; /**< which output is the primary color */
109   int maxInput, maxGeneric;  /**< max input index found */
110   int colorTemp, aaTemp;  /**< temp registers */
111};
112
113/**
114 * TGSI declaration transform callback.
115 * Look for a free input attrib, and two free temp regs.
116 */
117static void
118aa_transform_decl(struct tgsi_transform_context *ctx,
119                  struct tgsi_full_declaration *decl)
120{
121   struct aa_transform_context *aactx = (struct aa_transform_context *)ctx;
122
123   if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
124       decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
125       decl->Semantic.Index == 0) {
126      aactx->colorOutput = decl->Range.First;
127   }
128   else if (decl->Declaration.File == TGSI_FILE_INPUT) {
129      if ((int) decl->Range.Last > aactx->maxInput)
130         aactx->maxInput = decl->Range.Last;
131      if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
132           (int) decl->Semantic.Index > aactx->maxGeneric) {
133         aactx->maxGeneric = decl->Semantic.Index;
134      }
135   }
136   else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
137      uint i;
138      for (i = decl->Range.First;
139           i <= decl->Range.Last; i++) {
140         /*
141          * XXX this bitfield doesn't really cut it...
142          */
143         aactx->tempsUsed |= UINT64_C(1) << i;
144      }
145   }
146
147   ctx->emit_declaration(ctx, decl);
148}
149
150
151/**
152 * Find the lowest zero bit, or -1 if bitfield is all ones.
153 */
154static int
155free_bit(uint64_t bitfield)
156{
157   return ffsll(~bitfield) - 1;
158}
159
160
161/**
162 * TGSI transform prolog callback.
163 */
164static void
165aa_transform_prolog(struct tgsi_transform_context *ctx)
166{
167   struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
168   uint64_t usedTemps = aactx->tempsUsed;
169
170   /* find two free temp regs */
171   aactx->colorTemp = free_bit(usedTemps);
172   usedTemps |= UINT64_C(1) << aactx->colorTemp;
173   aactx->aaTemp = free_bit(usedTemps);
174   assert(aactx->colorTemp >= 0);
175   assert(aactx->aaTemp >= 0);
176
177   /* declare new generic input/texcoord */
178   tgsi_transform_input_decl(ctx, aactx->maxInput + 1,
179                             TGSI_SEMANTIC_GENERIC, aactx->maxGeneric + 1,
180                             TGSI_INTERPOLATE_LINEAR);
181
182   /* declare new temp regs */
183   tgsi_transform_temp_decl(ctx, aactx->aaTemp);
184   tgsi_transform_temp_decl(ctx, aactx->colorTemp);
185}
186
187
188/**
189 * TGSI transform epilog callback.
190 */
191static void
192aa_transform_epilog(struct tgsi_transform_context *ctx)
193{
194   struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
195
196   if (aactx->colorOutput != -1) {
197      struct tgsi_full_instruction inst;
198      /* insert distance-based coverage code for antialiasing. */
199
200      /* saturate(linewidth - fabs(interpx), linelength - fabs(interpz) */
201      inst = tgsi_default_full_instruction();
202      inst.Instruction.Saturate = true;
203      inst.Instruction.Opcode = TGSI_OPCODE_ADD;
204      inst.Instruction.NumDstRegs = 1;
205      tgsi_transform_dst_reg(&inst.Dst[0], TGSI_FILE_TEMPORARY,
206                             aactx->aaTemp, TGSI_WRITEMASK_XZ);
207      inst.Instruction.NumSrcRegs = 2;
208      tgsi_transform_src_reg(&inst.Src[1], TGSI_FILE_INPUT, aactx->maxInput + 1,
209                             TGSI_SWIZZLE_X, TGSI_SWIZZLE_X,
210                             TGSI_SWIZZLE_Z, TGSI_SWIZZLE_Z);
211      tgsi_transform_src_reg(&inst.Src[0], TGSI_FILE_INPUT, aactx->maxInput + 1,
212                             TGSI_SWIZZLE_Y, TGSI_SWIZZLE_Y,
213                             TGSI_SWIZZLE_W, TGSI_SWIZZLE_W);
214      inst.Src[1].Register.Absolute = true;
215      inst.Src[1].Register.Negate = true;
216      ctx->emit_instruction(ctx, &inst);
217
218      /* MUL width / height alpha */
219      tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_MUL,
220                                  TGSI_FILE_TEMPORARY, aactx->aaTemp,
221                                  TGSI_WRITEMASK_W,
222                                  TGSI_FILE_TEMPORARY, aactx->aaTemp,
223                                  TGSI_SWIZZLE_X,
224                                  TGSI_FILE_TEMPORARY, aactx->aaTemp,
225                                  TGSI_SWIZZLE_Z, false);
226
227      /* MOV rgb */
228      tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV,
229                              TGSI_FILE_OUTPUT, aactx->colorOutput,
230                              TGSI_WRITEMASK_XYZ,
231                              TGSI_FILE_TEMPORARY, aactx->colorTemp);
232
233      /* MUL alpha */
234      tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL,
235                              TGSI_FILE_OUTPUT, aactx->colorOutput,
236                              TGSI_WRITEMASK_W,
237                              TGSI_FILE_TEMPORARY, aactx->colorTemp,
238                              TGSI_FILE_TEMPORARY, aactx->aaTemp, false);
239   }
240}
241
242
243/**
244 * TGSI instruction transform callback.
245 * Replace writes to result.color w/ a temp reg.
246 */
247static void
248aa_transform_inst(struct tgsi_transform_context *ctx,
249                  struct tgsi_full_instruction *inst)
250{
251   struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
252   uint i;
253
254   /*
255    * Look for writes to result.color and replace with colorTemp reg.
256    */
257   for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
258      struct tgsi_full_dst_register *dst = &inst->Dst[i];
259      if (dst->Register.File == TGSI_FILE_OUTPUT &&
260          dst->Register.Index == aactx->colorOutput) {
261         dst->Register.File = TGSI_FILE_TEMPORARY;
262         dst->Register.Index = aactx->colorTemp;
263      }
264   }
265
266   ctx->emit_instruction(ctx, inst);
267}
268
269
270/**
271 * Generate the frag shader we'll use for drawing AA lines.
272 * This will be the user's shader plus some arithmetic instructions.
273 */
274static boolean
275generate_aaline_fs(struct aaline_stage *aaline)
276{
277   struct pipe_context *pipe = aaline->stage.draw->pipe;
278   const struct pipe_shader_state *orig_fs = &aaline->fs->state;
279   struct pipe_shader_state aaline_fs;
280   struct aa_transform_context transform;
281   const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
282
283   aaline_fs = *orig_fs; /* copy to init */
284   aaline_fs.tokens = tgsi_alloc_tokens(newLen);
285   if (aaline_fs.tokens == NULL)
286      return FALSE;
287
288   memset(&transform, 0, sizeof(transform));
289   transform.colorOutput = -1;
290   transform.maxInput = -1;
291   transform.maxGeneric = -1;
292   transform.colorTemp = -1;
293   transform.aaTemp = -1;
294   transform.base.prolog = aa_transform_prolog;
295   transform.base.epilog = aa_transform_epilog;
296   transform.base.transform_instruction = aa_transform_inst;
297   transform.base.transform_declaration = aa_transform_decl;
298
299   tgsi_transform_shader(orig_fs->tokens,
300                         (struct tgsi_token *) aaline_fs.tokens,
301                         newLen, &transform.base);
302
303#if 0 /* DEBUG */
304   debug_printf("draw_aaline, orig shader:\n");
305   tgsi_dump(orig_fs->tokens, 0);
306   debug_printf("draw_aaline, new shader:\n");
307   tgsi_dump(aaline_fs.tokens, 0);
308#endif
309
310   aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
311   if (aaline->fs->aaline_fs != NULL)
312      aaline->fs->generic_attrib = transform.maxGeneric + 1;
313
314   FREE((void *)aaline_fs.tokens);
315   return aaline->fs->aaline_fs != NULL;
316}
317
318static boolean
319generate_aaline_fs_nir(struct aaline_stage *aaline)
320{
321   struct pipe_context *pipe = aaline->stage.draw->pipe;
322   const struct pipe_shader_state *orig_fs = &aaline->fs->state;
323   struct pipe_shader_state aaline_fs;
324
325   aaline_fs = *orig_fs; /* copy to init */
326   aaline_fs.ir.nir = nir_shader_clone(NULL, orig_fs->ir.nir);
327   if (!aaline_fs.ir.nir)
328      return FALSE;
329
330   nir_lower_aaline_fs(aaline_fs.ir.nir, &aaline->fs->generic_attrib);
331   aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
332   if (aaline->fs->aaline_fs == NULL)
333      return FALSE;
334
335   return TRUE;
336}
337
338/**
339 * When we're about to draw our first AA line in a batch, this function is
340 * called to tell the driver to bind our modified fragment shader.
341 */
342static boolean
343bind_aaline_fragment_shader(struct aaline_stage *aaline)
344{
345   struct draw_context *draw = aaline->stage.draw;
346   struct pipe_context *pipe = draw->pipe;
347
348   if (!aaline->fs->aaline_fs) {
349      if (aaline->fs->state.type == PIPE_SHADER_IR_NIR) {
350         if (!generate_aaline_fs_nir(aaline))
351            return FALSE;
352      } else
353         if (!generate_aaline_fs(aaline))
354            return FALSE;
355   }
356
357   draw->suspend_flushing = TRUE;
358   aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
359   draw->suspend_flushing = FALSE;
360
361   return TRUE;
362}
363
364
365
366static inline struct aaline_stage *
367aaline_stage(struct draw_stage *stage)
368{
369   return (struct aaline_stage *) stage;
370}
371
372
373/**
374 * Draw a wide line by drawing a quad, using geometry which will
375 * fullfill GL's antialiased line requirements.
376 */
377static void
378aaline_line(struct draw_stage *stage, struct prim_header *header)
379{
380   const struct aaline_stage *aaline = aaline_stage(stage);
381   const float half_width = aaline->half_line_width;
382   struct prim_header tri;
383   struct vertex_header *v[8];
384   uint coordPos = aaline->coord_slot;
385   uint posPos = aaline->pos_slot;
386   float *pos, *tex;
387   float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
388   float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
389   float a = atan2f(dy, dx);
390   float c_a = cosf(a), s_a = sinf(a);
391   float half_length;
392   float t_l, t_w;
393   uint i;
394
395   half_length = 0.5f * sqrtf(dx * dx + dy * dy);
396
397   if (half_length < 0.5f) {
398      /*
399       * The logic we use for "normal" sized segments is incorrect
400       * for very short segments (basically because we only have
401       * one value to interpolate, not a distance to each endpoint).
402       * Therefore, we calculate half_length differently, so that for
403       * original line length (near) 0, we get alpha 0 - otherwise
404       * max alpha would still be 0.5. This also prevents us from
405       * artifacts due to degenerated lines (the endpoints being
406       * identical, which would still receive anywhere from alpha
407       * 0-0.5 otherwise) (at least the pstipple stage may generate
408       * such lines due to float inaccuracies if line length is very
409       * close to a integer).
410       * Might not be fully accurate neither (because the "strength" of
411       * the line is going to be determined by how close to the pixel
412       * center those 1 or 2 fragments are) but it's probably the best
413       * we can do.
414       */
415      half_length = 2.0f * half_length;
416   } else {
417      half_length = half_length + 0.5f;
418   }
419
420   t_w = half_width;
421   t_l = 0.5f;
422
423   /* allocate/dup new verts */
424   for (i = 0; i < 4; i++) {
425      v[i] = dup_vert(stage, header->v[i/2], i);
426   }
427
428   /*
429    * Quad strip for line from v0 to v1 (*=endpoints):
430    *
431    *  1                             3
432    *  +-----------------------------+
433    *  |                             |
434    *  | *v0                     v1* |
435    *  |                             |
436    *  +-----------------------------+
437    *  0                             2
438    */
439
440   /*
441    * We increase line length by 0.5 pixels (at each endpoint),
442    * and calculate the tri endpoints by moving them half-width
443    * distance away perpendicular to the line.
444    * XXX: since we change line endpoints (by 0.5 pixel), should
445    * actually re-interpolate all other values?
446    */
447
448   /* new verts */
449   pos = v[0]->data[posPos];
450   pos[0] += (-t_l * c_a -  t_w * s_a);
451   pos[1] += (-t_l * s_a +  t_w * c_a);
452
453   pos = v[1]->data[posPos];
454   pos[0] += (-t_l * c_a - -t_w * s_a);
455   pos[1] += (-t_l * s_a + -t_w * c_a);
456
457   pos = v[2]->data[posPos];
458   pos[0] += (t_l * c_a -  t_w * s_a);
459   pos[1] += (t_l * s_a +  t_w * c_a);
460
461   pos = v[3]->data[posPos];
462   pos[0] += (t_l * c_a - -t_w * s_a);
463   pos[1] += (t_l * s_a + -t_w * c_a);
464
465   /* new texcoords */
466   tex = v[0]->data[coordPos];
467   ASSIGN_4V(tex, -half_width, half_width, -half_length, half_length);
468
469   tex = v[1]->data[coordPos];
470   ASSIGN_4V(tex, half_width, half_width, -half_length, half_length);
471
472   tex = v[2]->data[coordPos];
473   ASSIGN_4V(tex, -half_width, half_width, half_length, half_length);
474
475   tex = v[3]->data[coordPos];
476   ASSIGN_4V(tex, half_width, half_width, half_length, half_length);
477
478   tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
479   stage->next->tri(stage->next, &tri);
480
481   tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
482   stage->next->tri(stage->next, &tri);
483}
484
485
486static void
487aaline_first_line(struct draw_stage *stage, struct prim_header *header)
488{
489   auto struct aaline_stage *aaline = aaline_stage(stage);
490   struct draw_context *draw = stage->draw;
491   struct pipe_context *pipe = draw->pipe;
492   const struct pipe_rasterizer_state *rast = draw->rasterizer;
493   void *r;
494
495   assert(draw->rasterizer->line_smooth && !draw->rasterizer->multisample);
496
497   if (draw->rasterizer->line_width <= 1.0)
498      aaline->half_line_width = 1.0;
499   else
500      aaline->half_line_width = 0.5f * draw->rasterizer->line_width + 0.5f;
501
502   if (!draw->rasterizer->half_pixel_center)
503      /*
504       * The tex coords probably would need adjustments?
505       */
506      debug_printf("aa lines without half pixel center may be wrong\n");
507
508   /*
509    * Bind (generate) our fragprog
510    */
511   if (!bind_aaline_fragment_shader(aaline)) {
512      stage->line = draw_pipe_passthrough_line;
513      stage->line(stage, header);
514      return;
515   }
516
517   draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
518
519   draw->suspend_flushing = TRUE;
520
521   /* Disable triangle culling, stippling, unfilled mode etc. */
522   r = draw_get_rasterizer_no_cull(draw, rast);
523   pipe->bind_rasterizer_state(pipe, r);
524
525   draw->suspend_flushing = FALSE;
526
527   /* now really draw first line */
528   stage->line = aaline_line;
529   stage->line(stage, header);
530}
531
532
533static void
534aaline_flush(struct draw_stage *stage, unsigned flags)
535{
536   struct draw_context *draw = stage->draw;
537   struct aaline_stage *aaline = aaline_stage(stage);
538   struct pipe_context *pipe = draw->pipe;
539
540   stage->line = aaline_first_line;
541   stage->next->flush(stage->next, flags);
542
543   /* restore original frag shader */
544   draw->suspend_flushing = TRUE;
545   aaline->driver_bind_fs_state(pipe, aaline->fs ? aaline->fs->driver_fs : NULL);
546
547   /* restore original rasterizer state */
548   if (draw->rast_handle) {
549      pipe->bind_rasterizer_state(pipe, draw->rast_handle);
550   }
551
552   draw->suspend_flushing = FALSE;
553
554   draw_remove_extra_vertex_attribs(draw);
555}
556
557
558static void
559aaline_reset_stipple_counter(struct draw_stage *stage)
560{
561   stage->next->reset_stipple_counter(stage->next);
562}
563
564
565static void
566aaline_destroy(struct draw_stage *stage)
567{
568   struct aaline_stage *aaline = aaline_stage(stage);
569   struct pipe_context *pipe = stage->draw->pipe;
570
571   draw_free_temp_verts(stage);
572
573   /* restore the old entry points */
574   pipe->create_fs_state = aaline->driver_create_fs_state;
575   pipe->bind_fs_state = aaline->driver_bind_fs_state;
576   pipe->delete_fs_state = aaline->driver_delete_fs_state;
577
578   FREE(stage);
579}
580
581
582static struct aaline_stage *
583draw_aaline_stage(struct draw_context *draw)
584{
585   struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
586   if (!aaline)
587      return NULL;
588
589   aaline->stage.draw = draw;
590   aaline->stage.name = "aaline";
591   aaline->stage.next = NULL;
592   aaline->stage.point = draw_pipe_passthrough_point;
593   aaline->stage.line = aaline_first_line;
594   aaline->stage.tri = draw_pipe_passthrough_tri;
595   aaline->stage.flush = aaline_flush;
596   aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
597   aaline->stage.destroy = aaline_destroy;
598
599   if (!draw_alloc_temp_verts(&aaline->stage, 8)) {
600      aaline->stage.destroy(&aaline->stage);
601      return NULL;
602   }
603
604   return aaline;
605}
606
607
608static struct aaline_stage *
609aaline_stage_from_pipe(struct pipe_context *pipe)
610{
611   struct draw_context *draw = (struct draw_context *) pipe->draw;
612
613   if (draw) {
614      return aaline_stage(draw->pipeline.aaline);
615   } else {
616      return NULL;
617   }
618}
619
620
621/**
622 * This function overrides the driver's create_fs_state() function and
623 * will typically be called by the gallium frontend.
624 */
625static void *
626aaline_create_fs_state(struct pipe_context *pipe,
627                       const struct pipe_shader_state *fs)
628{
629   struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
630   struct aaline_fragment_shader *aafs = NULL;
631
632   if (!aaline)
633      return NULL;
634
635   aafs = CALLOC_STRUCT(aaline_fragment_shader);
636
637   if (!aafs)
638      return NULL;
639
640   aafs->state.type = fs->type;
641   if (fs->type == PIPE_SHADER_IR_TGSI)
642      aafs->state.tokens = tgsi_dup_tokens(fs->tokens);
643   else
644      aafs->state.ir.nir = nir_shader_clone(NULL, fs->ir.nir);
645
646   /* pass-through */
647   aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
648
649   return aafs;
650}
651
652
653static void
654aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
655{
656   struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
657   struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
658
659   if (!aaline) {
660      return;
661   }
662
663   /* save current */
664   aaline->fs = aafs;
665   /* pass-through */
666   aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
667}
668
669
670static void
671aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
672{
673   struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
674   struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
675
676   if (!aafs) {
677      return;
678   }
679
680   if (aaline) {
681      /* pass-through */
682      aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
683
684      if (aafs->aaline_fs)
685         aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
686   }
687
688   if (aafs->state.type == PIPE_SHADER_IR_TGSI)
689      FREE((void*)aafs->state.tokens);
690   else
691      ralloc_free(aafs->state.ir.nir);
692   FREE(aafs);
693}
694
695
696void
697draw_aaline_prepare_outputs(struct draw_context *draw,
698                            struct draw_stage *stage)
699{
700   struct aaline_stage *aaline = aaline_stage(stage);
701   const struct pipe_rasterizer_state *rast = draw->rasterizer;
702
703   /* update vertex attrib info */
704   aaline->pos_slot = draw_current_shader_position_output(draw);
705
706   if (!rast->line_smooth || rast->multisample)
707      return;
708
709   /* allocate the extra post-transformed vertex attribute */
710   if (aaline->fs && aaline->fs->aaline_fs)
711      aaline->coord_slot = draw_alloc_extra_vertex_attrib(draw,
712                                                          TGSI_SEMANTIC_GENERIC,
713                                                          aaline->fs->generic_attrib);
714   else
715      aaline->coord_slot = -1;
716}
717
718/**
719 * Called by drivers that want to install this AA line prim stage
720 * into the draw module's pipeline.  This will not be used if the
721 * hardware has native support for AA lines.
722 */
723boolean
724draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
725{
726   struct aaline_stage *aaline;
727
728   pipe->draw = (void *) draw;
729
730   /*
731    * Create / install AA line drawing / prim stage
732    */
733   aaline = draw_aaline_stage(draw);
734   if (!aaline)
735      return FALSE;
736
737   /* save original driver functions */
738   aaline->driver_create_fs_state = pipe->create_fs_state;
739   aaline->driver_bind_fs_state = pipe->bind_fs_state;
740   aaline->driver_delete_fs_state = pipe->delete_fs_state;
741
742   /* override the driver's functions */
743   pipe->create_fs_state = aaline_create_fs_state;
744   pipe->bind_fs_state = aaline_bind_fs_state;
745   pipe->delete_fs_state = aaline_delete_fs_state;
746
747   /* Install once everything is known to be OK:
748    */
749   draw->pipeline.aaline = &aaline->stage;
750
751   return TRUE;
752}
753