paint.c revision 6df42d80234d13676fc3207cf44f0e371e3372b5 
1/**************************************************************************
2 *
3 * Copyright 2009 VMware, Inc.  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 VMWARE 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#include "paint.h"
28
29#include "shaders_cache.h"
30#include "matrix.h"
31#include "image.h"
32#include "st_inlines.h"
33
34#include "pipe/p_compiler.h"
35#include "pipe/p_inlines.h"
36
37#include "util/u_format.h"
38#include "util/u_memory.h"
39#include "util/u_math.h"
40
41#include "cso_cache/cso_context.h"
42
43struct vg_paint {
44   struct vg_object base;
45
46   VGPaintType type;
47
48   struct {
49      VGfloat color[4];
50      VGint colori[4];
51   } solid;
52
53   struct {
54      VGColorRampSpreadMode spread;
55      VGuint color_data[1024];
56      struct {
57         VGfloat  coords[4];
58         VGint  coordsi[4];
59      } linear;
60      struct {
61         VGfloat vals[5];
62         VGint valsi[5];
63      } radial;
64      struct pipe_texture *texture;
65      struct pipe_sampler_state sampler;
66
67      VGfloat *ramp_stops;
68      VGint *ramp_stopsi;
69      VGint    num_stops;
70
71      VGboolean color_ramps_premultiplied;
72   } gradient;
73
74   struct {
75      struct pipe_texture *texture;
76      VGTilingMode tiling_mode;
77      struct pipe_sampler_state sampler;
78   } pattern;
79
80   struct pipe_constant_buffer cbuf;
81   struct pipe_shader_state fs_state;
82   void *fs;
83};
84
85static INLINE VGuint mix_pixels(VGuint p1, VGuint a, VGuint p2, VGuint b)
86{
87   VGuint t = (p1 & 0xff00ff) * a + (p2 & 0xff00ff) * b;
88   t >>= 8; t &= 0xff00ff;
89
90   p1 = ((p1 >> 8) & 0xff00ff) * a + ((p2 >> 8) & 0xff00ff) * b;
91   p1 &= 0xff00ff00; p1 |= t;
92
93   return p1;
94}
95
96static INLINE VGuint float4_to_argb(const VGfloat *clr)
97{
98   return float_to_ubyte(clr[3]) << 24 |
99      float_to_ubyte(clr[0]) << 16 |
100      float_to_ubyte(clr[1]) << 8 |
101      float_to_ubyte(clr[2]) << 0;
102}
103
104static INLINE void create_gradient_data(const VGfloat *ramp_stops,
105                                        VGint num,
106                                        VGuint *data,
107                                        VGint size)
108{
109   VGint i;
110   VGint pos = 0;
111   VGfloat fpos = 0, incr = 1.f / size;
112   VGuint last_color;
113
114   while (fpos < ramp_stops[0]) {
115      data[pos] = float4_to_argb(ramp_stops + 1);
116      fpos += incr;
117      ++pos;
118   }
119
120   for (i = 0; i < num - 1; ++i) {
121      VGint rcur  = 5 * i;
122      VGint rnext = 5 * (i + 1);
123      VGfloat delta = 1.f/(ramp_stops[rnext] - ramp_stops[rcur]);
124      while (fpos < ramp_stops[rnext] && pos < size) {
125         VGint dist = 256 * ((fpos - ramp_stops[rcur]) * delta);
126         VGint idist = 256 - dist;
127         VGuint current_color = float4_to_argb(ramp_stops + rcur + 1);
128         VGuint next_color = float4_to_argb(ramp_stops + rnext + 1);
129         data[pos] = mix_pixels(current_color, idist,
130                                next_color, dist);
131         fpos += incr;
132         ++pos;
133      }
134   }
135
136   last_color = float4_to_argb(ramp_stops + ((num - 1) * 5 + 1));
137   while (pos < size) {
138      data[pos] = last_color;
139      ++pos;
140   }
141   data[size-1] = last_color;
142}
143
144static INLINE struct pipe_texture *create_gradient_texture(struct vg_paint *p)
145{
146   struct pipe_context *pipe = p->base.ctx->pipe;
147   struct pipe_screen *screen = pipe->screen;
148   struct pipe_texture *tex = 0;
149   struct pipe_texture templ;
150
151   memset(&templ, 0, sizeof(templ));
152   templ.target = PIPE_TEXTURE_1D;
153   templ.format = PIPE_FORMAT_A8R8G8B8_UNORM;
154   templ.last_level = 0;
155   templ.width0 = 1024;
156   templ.height0 = 1;
157   templ.depth0 = 1;
158   util_format_get_block(PIPE_FORMAT_A8R8G8B8_UNORM, &templ.block);
159   templ.tex_usage = PIPE_TEXTURE_USAGE_SAMPLER;
160
161   tex = screen->texture_create(screen, &templ);
162
163   { /* upload color_data */
164      struct pipe_transfer *transfer =
165         st_no_flush_get_tex_transfer(p->base.ctx, tex, 0, 0, 0,
166                                      PIPE_TRANSFER_WRITE, 0, 0, 1024, 1);
167      void *map = screen->transfer_map(screen, transfer);
168      memcpy(map, p->gradient.color_data, sizeof(VGint)*1024);
169      screen->transfer_unmap(screen, transfer);
170      screen->tex_transfer_destroy(transfer);
171   }
172
173   return tex;
174}
175
176struct vg_paint * paint_create(struct vg_context *ctx)
177{
178   struct vg_paint *paint = CALLOC_STRUCT(vg_paint);
179   const VGfloat default_color[] = {0.0f, 0.0f, 0.0f, 1.0f};
180   const VGfloat def_ling[] = {0.0f, 0.0f, 1.0f, 0.0f};
181   const VGfloat def_radg[] = {0.0f, 0.0f, 0.0f, 0.0f, 1.0f};
182   vg_init_object(&paint->base, ctx, VG_OBJECT_PAINT);
183   vg_context_add_object(ctx, VG_OBJECT_PAINT, paint);
184
185   paint->type = VG_PAINT_TYPE_COLOR;
186   memcpy(paint->solid.color, default_color,
187          4 * sizeof(VGfloat));
188   paint->gradient.spread = VG_COLOR_RAMP_SPREAD_PAD;
189   memcpy(paint->gradient.linear.coords, def_ling,
190          4 * sizeof(VGfloat));
191   memcpy(paint->gradient.radial.vals, def_radg,
192          5 * sizeof(VGfloat));
193
194   paint->gradient.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
195   paint->gradient.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
196   paint->gradient.sampler.min_img_filter = PIPE_TEX_MIPFILTER_NEAREST;
197   paint->gradient.sampler.mag_img_filter = PIPE_TEX_MIPFILTER_NEAREST;
198   paint->gradient.sampler.normalized_coords = 1;
199
200   memcpy(&paint->pattern.sampler,
201          &paint->gradient.sampler,
202          sizeof(struct pipe_sampler_state));
203
204   return paint;
205}
206
207void paint_destroy(struct vg_paint *paint)
208{
209   struct vg_context *ctx = paint->base.ctx;
210   if (paint->pattern.texture)
211      pipe_texture_reference(&paint->pattern.texture, NULL);
212   if (ctx)
213      vg_context_remove_object(ctx, VG_OBJECT_PAINT, paint);
214
215   free(paint->gradient.ramp_stopsi);
216   free(paint->gradient.ramp_stops);
217   free(paint);
218}
219
220void paint_set_color(struct vg_paint *paint,
221                     const VGfloat *color)
222{
223   paint->solid.color[0] = color[0];
224   paint->solid.color[1] = color[1];
225   paint->solid.color[2] = color[2];
226   paint->solid.color[3] = color[3];
227
228   paint->solid.colori[0] = FLT_TO_INT(color[0]);
229   paint->solid.colori[1] = FLT_TO_INT(color[1]);
230   paint->solid.colori[2] = FLT_TO_INT(color[2]);
231   paint->solid.colori[3] = FLT_TO_INT(color[3]);
232}
233
234static INLINE void paint_color_buffer(struct vg_paint *paint, void *buffer)
235{
236   VGfloat *map = (VGfloat*)buffer;
237   memcpy(buffer, paint->solid.color, 4 * sizeof(VGfloat));
238   map[4] = 0.f;
239   map[5] = 1.f;
240   map[6] = 2.f;
241   map[7] = 4.f;
242}
243
244static INLINE void paint_linear_gradient_buffer(struct vg_paint *paint, void *buffer)
245{
246   struct vg_context *ctx = paint->base.ctx;
247   VGfloat *map = (VGfloat*)buffer;
248
249   map[0] = paint->gradient.linear.coords[2] - paint->gradient.linear.coords[0];
250   map[1] = paint->gradient.linear.coords[3] - paint->gradient.linear.coords[1];
251   map[2] = 1.f / (map[0] * map[0] + map[1] * map[1]);
252   map[3] = 1.f;
253
254   map[4] = 0.f;
255   map[5] = 1.f;
256   map[6] = 2.f;
257   map[7] = 4.f;
258   {
259      struct matrix mat;
260      struct matrix inv;
261      matrix_load_identity(&mat);
262      matrix_translate(&mat, -paint->gradient.linear.coords[0], -paint->gradient.linear.coords[1]);
263      memcpy(&inv, &ctx->state.vg.fill_paint_to_user_matrix,
264             sizeof(struct matrix));
265      matrix_invert(&inv);
266      matrix_mult(&inv, &mat);
267      memcpy(&mat, &inv,
268             sizeof(struct matrix));
269
270      map[8]  = mat.m[0]; map[9]  = mat.m[3]; map[10] = mat.m[6]; map[11] = 0.f;
271      map[12] = mat.m[1]; map[13] = mat.m[4]; map[14] = mat.m[7]; map[15] = 0.f;
272      map[16] = mat.m[2]; map[17] = mat.m[5]; map[18] = mat.m[8]; map[19] = 0.f;
273   }
274#if 0
275   debug_printf("Coords  (%f, %f, %f, %f)\n",
276                map[0], map[1], map[2], map[3]);
277#endif
278}
279
280
281static INLINE void paint_radial_gradient_buffer(struct vg_paint *paint, void *buffer)
282{
283   VGfloat *radialCoords = paint->gradient.radial.vals;
284   struct vg_context *ctx = paint->base.ctx;
285
286   VGfloat *map = (VGfloat*)buffer;
287
288   map[0] = radialCoords[0] - radialCoords[2];
289   map[1] = radialCoords[1] - radialCoords[3];
290   map[2] = -map[0] * map[0] - map[1] * map[1] +
291            radialCoords[4] * radialCoords[4];
292   map[3] = 1.f;
293
294   map[4] = 0.f;
295   map[5] = 1.f;
296   map[6] = 2.f;
297   map[7] = 4.f;
298
299   {
300      struct matrix mat;
301      struct matrix inv;
302      matrix_load_identity(&mat);
303      matrix_translate(&mat, -radialCoords[2], -radialCoords[3]);
304      memcpy(&inv, &ctx->state.vg.fill_paint_to_user_matrix,
305             sizeof(struct matrix));
306      matrix_invert(&inv);
307      matrix_mult(&inv, &mat);
308      memcpy(&mat, &inv,
309             sizeof(struct matrix));
310
311      map[8]  = mat.m[0]; map[9]  = mat.m[3]; map[10] = mat.m[6]; map[11] = 0.f;
312      map[12] = mat.m[1]; map[13] = mat.m[4]; map[14] = mat.m[7]; map[15] = 0.f;
313      map[16] = mat.m[2]; map[17] = mat.m[5]; map[18] = mat.m[8]; map[19] = 0.f;
314   }
315
316#if 0
317   debug_printf("Coords  (%f, %f, %f, %f)\n",
318                map[0], map[1], map[2], map[3]);
319#endif
320}
321
322
323static INLINE void  paint_pattern_buffer(struct vg_paint *paint, void *buffer)
324{
325   struct vg_context *ctx = paint->base.ctx;
326
327   VGfloat *map = (VGfloat *)buffer;
328   memcpy(map, paint->solid.color, 4 * sizeof(VGfloat));
329
330   map[4] = 0.f;
331   map[5] = 1.f;
332   map[6] = paint->pattern.texture->width0;
333   map[7] = paint->pattern.texture->height0;
334   {
335      struct matrix mat;
336      memcpy(&mat, &ctx->state.vg.fill_paint_to_user_matrix,
337             sizeof(struct matrix));
338      matrix_invert(&mat);
339      {
340         struct matrix pm;
341         memcpy(&pm, &ctx->state.vg.path_user_to_surface_matrix,
342                sizeof(struct matrix));
343         matrix_invert(&pm);
344         matrix_mult(&pm, &mat);
345         memcpy(&mat, &pm, sizeof(struct matrix));
346      }
347
348      map[8]  = mat.m[0]; map[9]  = mat.m[3]; map[10] = mat.m[6]; map[11] = 0.f;
349      map[12] = mat.m[1]; map[13] = mat.m[4]; map[14] = mat.m[7]; map[15] = 0.f;
350      map[16] = mat.m[2]; map[17] = mat.m[5]; map[18] = mat.m[8]; map[19] = 0.f;
351   }
352}
353
354void paint_set_type(struct vg_paint *paint, VGPaintType type)
355{
356   paint->type = type;
357}
358
359void paint_set_ramp_stops(struct vg_paint *paint, const VGfloat *stops,
360                          int num)
361{
362   const VGfloat default_stops[] = {0.0f, 0.0f, 0.0f, 0.0f, 1.0f,
363                                    1.0f, 1.0f, 1.0f, 1.0f, 1.0f};
364   VGint i;
365   const VGint num_stops = num / 5;
366   VGfloat last_coord;
367
368   paint->gradient.num_stops = num;
369   if (num) {
370      free(paint->gradient.ramp_stops);
371      paint->gradient.ramp_stops = malloc(sizeof(VGfloat)*num);
372      memcpy(paint->gradient.ramp_stops, stops, sizeof(VGfloat)*num);
373   } else
374      return;
375
376   /* stops must be in increasing order. the last stop is 1.0. if the
377    * first one is bigger than 1 then the whole sequence is invalid*/
378   if (stops[0] > 1) {
379      stops = default_stops;
380      num = 10;
381   }
382   last_coord = stops[0];
383   for (i = 1; i < num_stops; ++i) {
384      VGint idx = 5 * i;
385      VGfloat coord = stops[idx];
386      if (!floatsEqual(last_coord, coord) && coord < last_coord) {
387         stops = default_stops;
388         num = 10;
389         break;
390      }
391      last_coord = coord;
392   }
393
394   create_gradient_data(stops, num / 5, paint->gradient.color_data,
395                        1024);
396
397   if (paint->gradient.texture) {
398      pipe_texture_reference(&paint->gradient.texture, NULL);
399      paint->gradient.texture = 0;
400   }
401
402   paint->gradient.texture = create_gradient_texture(paint);
403}
404
405void paint_set_colori(struct vg_paint *p,
406                      VGuint rgba)
407{
408   p->solid.color[0] = ((rgba >> 24) & 0xff) / 255.f;
409   p->solid.color[1] = ((rgba >> 16) & 0xff) / 255.f;
410   p->solid.color[2] = ((rgba >>  8) & 0xff) / 255.f;
411   p->solid.color[3] = ((rgba >>  0) & 0xff) / 255.f;
412}
413
414VGuint paint_colori(struct vg_paint *p)
415{
416#define F2B(f) (float_to_ubyte(f))
417
418   return ((F2B(p->solid.color[0]) << 24) |
419           (F2B(p->solid.color[1]) << 16) |
420           (F2B(p->solid.color[2]) << 8)  |
421           (F2B(p->solid.color[3]) << 0));
422#undef F2B
423}
424
425void paint_set_linear_gradient(struct vg_paint *paint,
426                               const VGfloat *coords)
427{
428   memcpy(paint->gradient.linear.coords, coords, sizeof(VGfloat) * 4);
429}
430
431void paint_set_spread_mode(struct vg_paint *paint,
432                           VGint mode)
433{
434   paint->gradient.spread = mode;
435   switch(mode) {
436   case VG_COLOR_RAMP_SPREAD_PAD:
437      paint->gradient.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
438      break;
439   case VG_COLOR_RAMP_SPREAD_REPEAT:
440      paint->gradient.sampler.wrap_s = PIPE_TEX_WRAP_REPEAT;
441      break;
442   case VG_COLOR_RAMP_SPREAD_REFLECT:
443      paint->gradient.sampler.wrap_s = PIPE_TEX_WRAP_MIRROR_REPEAT;
444      break;
445   }
446}
447
448VGColorRampSpreadMode paint_spread_mode(struct vg_paint *paint)
449{
450   return paint->gradient.spread;
451}
452
453void paint_set_radial_gradient(struct vg_paint *paint,
454                               const VGfloat *values)
455{
456   memcpy(paint->gradient.radial.vals, values, sizeof(VGfloat) * 5);
457}
458
459void paint_set_pattern(struct vg_paint *paint,
460                       struct vg_image *img)
461{
462   if (paint->pattern.texture)
463      pipe_texture_reference(&paint->pattern.texture, NULL);
464
465   paint->pattern.texture = 0;
466   pipe_texture_reference(&paint->pattern.texture,
467                          img->texture);
468}
469
470void paint_set_pattern_tiling(struct vg_paint *paint,
471                              VGTilingMode mode)
472{
473   paint->pattern.tiling_mode = mode;
474
475   switch(mode) {
476   case VG_TILE_FILL:
477      paint->pattern.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_BORDER;
478      paint->pattern.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_BORDER;
479      break;
480   case VG_TILE_PAD:
481      paint->pattern.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
482      paint->pattern.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
483      break;
484   case VG_TILE_REPEAT:
485      paint->pattern.sampler.wrap_s = PIPE_TEX_WRAP_REPEAT;
486      paint->pattern.sampler.wrap_t = PIPE_TEX_WRAP_REPEAT;
487      break;
488   case VG_TILE_REFLECT:
489      paint->pattern.sampler.wrap_s = PIPE_TEX_WRAP_MIRROR_REPEAT;
490      paint->pattern.sampler.wrap_t = PIPE_TEX_WRAP_MIRROR_REPEAT;
491      break;
492   default:
493      debug_assert("!Unknown tiling mode");
494   }
495}
496
497void paint_get_color(struct vg_paint *paint,
498                     VGfloat *color)
499{
500   color[0] = paint->solid.color[0];
501   color[1] = paint->solid.color[1];
502   color[2] = paint->solid.color[2];
503   color[3] = paint->solid.color[3];
504}
505
506void paint_ramp_stops(struct vg_paint *paint, VGfloat *stops,
507                      int num)
508{
509   memcpy(stops, paint->gradient.ramp_stops, sizeof(VGfloat)*num);
510}
511
512void paint_linear_gradient(struct vg_paint *paint,
513                           VGfloat *coords)
514{
515   memcpy(coords, paint->gradient.linear.coords, sizeof(VGfloat)*4);
516}
517
518void paint_radial_gradient(struct vg_paint *paint,
519                           VGfloat *coords)
520{
521   memcpy(coords, paint->gradient.radial.vals, sizeof(VGfloat)*5);
522}
523
524int paint_num_ramp_stops(struct vg_paint *paint)
525{
526   return paint->gradient.num_stops;
527}
528
529VGPaintType paint_type(struct vg_paint *paint)
530{
531   return paint->type;
532}
533
534void paint_set_coloriv(struct vg_paint *paint,
535                      const VGint *color)
536{
537   paint->solid.color[0] = color[0];
538   paint->solid.color[1] = color[1];
539   paint->solid.color[2] = color[2];
540   paint->solid.color[3] = color[3];
541
542   paint->solid.colori[0] = color[0];
543   paint->solid.colori[1] = color[1];
544   paint->solid.colori[2] = color[2];
545   paint->solid.colori[3] = color[3];
546}
547
548void paint_get_coloriv(struct vg_paint *paint,
549                      VGint *color)
550{
551   color[0] = paint->solid.colori[0];
552   color[1] = paint->solid.colori[1];
553   color[2] = paint->solid.colori[2];
554   color[3] = paint->solid.colori[3];
555}
556
557void paint_set_color_ramp_premultiplied(struct vg_paint *paint,
558                                        VGboolean set)
559{
560   paint->gradient.color_ramps_premultiplied = set;
561}
562
563VGboolean paint_color_ramp_premultiplied(struct vg_paint *paint)
564{
565   return paint->gradient.color_ramps_premultiplied;
566}
567
568void paint_set_ramp_stopsi(struct vg_paint *paint, const VGint *stops,
569                           int num)
570{
571   if (num) {
572      free(paint->gradient.ramp_stopsi);
573      paint->gradient.ramp_stopsi = malloc(sizeof(VGint)*num);
574      memcpy(paint->gradient.ramp_stopsi, stops, sizeof(VGint)*num);
575   }
576}
577
578void paint_ramp_stopsi(struct vg_paint *paint, VGint *stops,
579                       int num)
580{
581   memcpy(stops, paint->gradient.ramp_stopsi, sizeof(VGint)*num);
582}
583
584void paint_set_linear_gradienti(struct vg_paint *paint,
585                                const VGint *coords)
586{
587   memcpy(paint->gradient.linear.coordsi, coords, sizeof(VGint) * 4);
588}
589
590void paint_linear_gradienti(struct vg_paint *paint,
591                            VGint *coords)
592{
593   memcpy(coords, paint->gradient.linear.coordsi, sizeof(VGint)*4);
594}
595
596void paint_set_radial_gradienti(struct vg_paint *paint,
597                                const VGint *values)
598{
599   memcpy(paint->gradient.radial.valsi, values, sizeof(VGint) * 5);
600}
601
602void paint_radial_gradienti(struct vg_paint *paint,
603                            VGint *coords)
604{
605   memcpy(coords, paint->gradient.radial.valsi, sizeof(VGint)*5);
606}
607
608VGTilingMode paint_pattern_tiling(struct vg_paint *paint)
609{
610   return paint->pattern.tiling_mode;
611}
612
613VGint paint_bind_samplers(struct vg_paint *paint, struct pipe_sampler_state **samplers,
614                          struct pipe_texture **textures)
615{
616   struct vg_context *ctx = vg_current_context();
617
618   switch(paint->type) {
619   case VG_PAINT_TYPE_LINEAR_GRADIENT:
620   case VG_PAINT_TYPE_RADIAL_GRADIENT: {
621      if (paint->gradient.texture) {
622         paint->gradient.sampler.min_img_filter = image_sampler_filter(ctx);
623         paint->gradient.sampler.mag_img_filter = image_sampler_filter(ctx);
624         samplers[0] = &paint->gradient.sampler;
625         textures[0] = paint->gradient.texture;
626         return 1;
627      }
628   }
629      break;
630   case VG_PAINT_TYPE_PATTERN: {
631      memcpy(paint->pattern.sampler.border_color,
632             ctx->state.vg.tile_fill_color,
633             sizeof(VGfloat) * 4);
634      paint->pattern.sampler.min_img_filter = image_sampler_filter(ctx);
635      paint->pattern.sampler.mag_img_filter = image_sampler_filter(ctx);
636      samplers[0] = &paint->pattern.sampler;
637      textures[0] = paint->pattern.texture;
638      return 1;
639   }
640      break;
641   default:
642      samplers[0] = &paint->pattern.sampler; /* dummy */
643      textures[0] = 0;
644      return 0;
645      break;
646   }
647   return 0;
648}
649
650void paint_resolve_type(struct vg_paint *paint)
651{
652   if (paint->type == VG_PAINT_TYPE_PATTERN &&
653       !paint->pattern.texture) {
654      paint->type = VG_PAINT_TYPE_COLOR;
655   }
656}
657
658VGint paint_constant_buffer_size(struct vg_paint *paint)
659{
660   switch(paint->type) {
661   case VG_PAINT_TYPE_COLOR:
662      return 8 * sizeof(VGfloat);/*4 color + 4 constants (0.f,1.f,2.f,4.f)*/
663      break;
664   case VG_PAINT_TYPE_LINEAR_GRADIENT:
665      return 20 * sizeof(VGfloat);
666      break;
667   case VG_PAINT_TYPE_RADIAL_GRADIENT:
668      return 20 * sizeof(VGfloat);
669      break;
670   case VG_PAINT_TYPE_PATTERN:
671      return 20 * sizeof(VGfloat);
672      break;
673   default:
674      debug_printf("Uknown paint type: %d\n", paint->type);
675   }
676
677   return 0;
678}
679
680void paint_fill_constant_buffer(struct vg_paint *paint,
681                                void *buffer)
682{
683   switch(paint->type) {
684   case VG_PAINT_TYPE_COLOR:
685      paint_color_buffer(paint, buffer);
686      break;
687   case VG_PAINT_TYPE_LINEAR_GRADIENT:
688      paint_linear_gradient_buffer(paint, buffer);
689      break;
690   case VG_PAINT_TYPE_RADIAL_GRADIENT:
691      paint_radial_gradient_buffer(paint, buffer);
692      break;
693   case VG_PAINT_TYPE_PATTERN:
694      paint_pattern_buffer(paint, buffer);
695      break;
696
697   default:
698      abort();
699   }
700}
701