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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