1/**************************************************************************
2 *
3 * Copyright 2013 Grigori Goronzy <greg@chown.ath.cx>.
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 *  References:
30 *
31 *  Lin, S. F., Chang, Y. L., & Chen, L. G. (2003).
32 *  Motion adaptive interpolation with horizontal motion detection for deinterlacing.
33 *  Consumer Electronics, IEEE Transactions on, 49(4), 1256-1265.
34 *
35 *  Pei-Yin, C. H. E. N., & Yao-Hsien, L. A. I. (2007).
36 *  A low-complexity interpolation method for deinterlacing.
37 *  IEICE transactions on information and systems, 90(2), 606-608.
38 *
39 */
40
41#include <stdio.h>
42
43#include "pipe/p_context.h"
44
45#include "tgsi/tgsi_ureg.h"
46
47#include "util/u_draw.h"
48#include "util/u_memory.h"
49#include "util/u_math.h"
50#include "util/u_format.h"
51
52#include "vl_types.h"
53#include "vl_video_buffer.h"
54#include "vl_vertex_buffers.h"
55#include "vl_deint_filter.h"
56
57enum VS_OUTPUT
58{
59   VS_O_VPOS = 0,
60   VS_O_VTEX = 0
61};
62
63static void *
64create_vert_shader(struct vl_deint_filter *filter)
65{
66   struct ureg_program *shader;
67   struct ureg_src i_vpos;
68   struct ureg_dst o_vpos, o_vtex;
69
70   shader = ureg_create(PIPE_SHADER_VERTEX);
71   if (!shader)
72      return NULL;
73
74   i_vpos = ureg_DECL_vs_input(shader, 0);
75   o_vpos = ureg_DECL_output(shader, TGSI_SEMANTIC_POSITION, VS_O_VPOS);
76   o_vtex = ureg_DECL_output(shader, TGSI_SEMANTIC_GENERIC, VS_O_VTEX);
77
78   ureg_MOV(shader, o_vpos, i_vpos);
79   ureg_MOV(shader, o_vtex, i_vpos);
80
81   ureg_END(shader);
82
83   return ureg_create_shader_and_destroy(shader, filter->pipe);
84}
85
86static void *
87create_copy_frag_shader(struct vl_deint_filter *filter, unsigned field)
88{
89   struct ureg_program *shader;
90   struct ureg_src i_vtex;
91   struct ureg_src sampler;
92   struct ureg_dst o_fragment;
93   struct ureg_dst t_tex;
94
95   shader = ureg_create(PIPE_SHADER_FRAGMENT);
96   if (!shader) {
97      return NULL;
98   }
99   t_tex = ureg_DECL_temporary(shader);
100
101   i_vtex = ureg_DECL_fs_input(shader, TGSI_SEMANTIC_GENERIC, VS_O_VTEX, TGSI_INTERPOLATE_LINEAR);
102   sampler = ureg_DECL_sampler(shader, 2);
103   o_fragment = ureg_DECL_output(shader, TGSI_SEMANTIC_COLOR, 0);
104
105   ureg_MOV(shader, t_tex, i_vtex);
106   if (field) {
107      ureg_MOV(shader, ureg_writemask(t_tex, TGSI_WRITEMASK_ZW),
108               ureg_imm4f(shader, 0, 0, 1.0f, 0));
109   } else {
110      ureg_MOV(shader, ureg_writemask(t_tex, TGSI_WRITEMASK_ZW),
111               ureg_imm1f(shader, 0));
112   }
113
114   ureg_TEX(shader, o_fragment, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_tex), sampler);
115
116   ureg_release_temporary(shader, t_tex);
117   ureg_END(shader);
118
119   return ureg_create_shader_and_destroy(shader, filter->pipe);
120}
121
122static void *
123create_deint_frag_shader(struct vl_deint_filter *filter, unsigned field,
124                         struct vertex2f *sizes, bool spatial_filter)
125{
126   struct ureg_program *shader;
127   struct ureg_src i_vtex;
128   struct ureg_src sampler_cur;
129   struct ureg_src sampler_prevprev;
130   struct ureg_src sampler_prev;
131   struct ureg_src sampler_next;
132   struct ureg_dst o_fragment;
133   struct ureg_dst t_tex;
134   struct ureg_dst t_comp_top, t_comp_bot;
135   struct ureg_dst t_diff;
136   struct ureg_dst t_a, t_b;
137   struct ureg_dst t_weave, t_linear;
138
139   shader = ureg_create(PIPE_SHADER_FRAGMENT);
140   if (!shader) {
141      return NULL;
142   }
143
144   t_tex = ureg_DECL_temporary(shader);
145   t_comp_top = ureg_DECL_temporary(shader);
146   t_comp_bot = ureg_DECL_temporary(shader);
147   t_diff = ureg_DECL_temporary(shader);
148   t_a = ureg_DECL_temporary(shader);
149   t_b = ureg_DECL_temporary(shader);
150   t_weave = ureg_DECL_temporary(shader);
151   t_linear = ureg_DECL_temporary(shader);
152
153   i_vtex = ureg_DECL_fs_input(shader, TGSI_SEMANTIC_GENERIC, VS_O_VTEX, TGSI_INTERPOLATE_LINEAR);
154   sampler_prevprev = ureg_DECL_sampler(shader, 0);
155   sampler_prev = ureg_DECL_sampler(shader, 1);
156   sampler_cur = ureg_DECL_sampler(shader, 2);
157   sampler_next = ureg_DECL_sampler(shader, 3);
158   o_fragment = ureg_DECL_output(shader, TGSI_SEMANTIC_COLOR, 0);
159
160   // we don't care about ZW interpolation (allows better optimization)
161   ureg_MOV(shader, t_tex, i_vtex);
162   ureg_MOV(shader, ureg_writemask(t_tex, TGSI_WRITEMASK_ZW),
163            ureg_imm1f(shader, 0));
164
165   // sample between texels for cheap lowpass
166   ureg_ADD(shader, t_comp_top, ureg_src(t_tex),
167            ureg_imm4f(shader, sizes->x * 0.5f, sizes->y * -0.5f, 0, 0));
168   ureg_ADD(shader, t_comp_bot, ureg_src(t_tex),
169            ureg_imm4f(shader, sizes->x * -0.5f, sizes->y * 0.5f, 1.0f, 0));
170
171   if (field == 0) {
172      /* interpolating top field -> current field is a bottom field */
173      // cur vs prev2
174      ureg_TEX(shader, t_a, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_bot), sampler_cur);
175      ureg_TEX(shader, t_b, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_bot), sampler_prevprev);
176      ureg_ADD(shader, ureg_writemask(t_diff, TGSI_WRITEMASK_X), ureg_src(t_a), ureg_negate(ureg_src(t_b)));
177      // prev vs next
178      ureg_TEX(shader, t_a, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_top), sampler_prev);
179      ureg_TEX(shader, t_b, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_top), sampler_next);
180      ureg_ADD(shader, ureg_writemask(t_diff, TGSI_WRITEMASK_Y), ureg_src(t_a), ureg_negate(ureg_src(t_b)));
181   } else {
182      /* interpolating bottom field -> current field is a top field */
183      // cur vs prev2
184      ureg_TEX(shader, t_a, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_top), sampler_cur);
185      ureg_TEX(shader, t_b, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_top), sampler_prevprev);
186      ureg_ADD(shader, ureg_writemask(t_diff, TGSI_WRITEMASK_X), ureg_src(t_a), ureg_negate(ureg_src(t_b)));
187      // prev vs next
188      ureg_TEX(shader, t_a, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_bot), sampler_prev);
189      ureg_TEX(shader, t_b, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_bot), sampler_next);
190      ureg_ADD(shader, ureg_writemask(t_diff, TGSI_WRITEMASK_Y), ureg_src(t_a), ureg_negate(ureg_src(t_b)));
191   }
192
193   // absolute maximum of differences
194   ureg_MAX(shader, ureg_writemask(t_diff, TGSI_WRITEMASK_X), ureg_abs(ureg_src(t_diff)),
195            ureg_scalar(ureg_abs(ureg_src(t_diff)), TGSI_SWIZZLE_Y));
196
197   if (field == 0) {
198      /* weave with prev top field */
199      ureg_TEX(shader, t_weave, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_tex), sampler_prev);
200      /* get linear interpolation from current bottom field */
201      ureg_ADD(shader, t_comp_top, ureg_src(t_tex), ureg_imm4f(shader, 0, sizes->y * -1.0f, 1.0f, 0));
202      ureg_TEX(shader, t_linear, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_top), sampler_cur);
203   } else {
204      /* weave with prev bottom field */
205      ureg_ADD(shader, t_comp_bot, ureg_src(t_tex), ureg_imm4f(shader, 0, 0, 1.0f, 0));
206      ureg_TEX(shader, t_weave, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_bot), sampler_prev);
207      /* get linear interpolation from current top field */
208      ureg_ADD(shader, t_comp_bot, ureg_src(t_tex), ureg_imm4f(shader, 0, sizes->y * 1.0f, 0, 0));
209      ureg_TEX(shader, t_linear, TGSI_TEXTURE_2D_ARRAY, ureg_src(t_comp_bot), sampler_cur);
210   }
211
212   // mix between weave and linear
213   // fully weave if diff < 6 (0.02353), fully interpolate if diff > 14 (0.05490)
214   ureg_ADD(shader, ureg_writemask(t_diff, TGSI_WRITEMASK_X), ureg_src(t_diff),
215            ureg_imm4f(shader, -0.02353f, 0, 0, 0));
216   ureg_MUL(shader, ureg_saturate(ureg_writemask(t_diff, TGSI_WRITEMASK_X)),
217            ureg_src(t_diff), ureg_imm4f(shader, 31.8750f, 0, 0, 0));
218   ureg_LRP(shader, ureg_writemask(t_tex, TGSI_WRITEMASK_X), ureg_src(t_diff),
219            ureg_src(t_linear), ureg_src(t_weave));
220   ureg_MOV(shader, o_fragment, ureg_scalar(ureg_src(t_tex), TGSI_SWIZZLE_X));
221
222   ureg_release_temporary(shader, t_tex);
223   ureg_release_temporary(shader, t_comp_top);
224   ureg_release_temporary(shader, t_comp_bot);
225   ureg_release_temporary(shader, t_diff);
226   ureg_release_temporary(shader, t_a);
227   ureg_release_temporary(shader, t_b);
228   ureg_release_temporary(shader, t_weave);
229   ureg_release_temporary(shader, t_linear);
230   ureg_END(shader);
231
232   return ureg_create_shader_and_destroy(shader, filter->pipe);
233}
234
235bool
236vl_deint_filter_init(struct vl_deint_filter *filter, struct pipe_context *pipe,
237                     unsigned video_width, unsigned video_height,
238                     bool skip_chroma, bool spatial_filter)
239{
240   struct pipe_rasterizer_state rs_state;
241   struct pipe_blend_state blend;
242   struct pipe_sampler_state sampler;
243   struct pipe_vertex_element ve;
244   struct vertex2f sizes;
245   struct pipe_video_buffer templ;
246
247   assert(filter && pipe);
248   assert(video_width && video_height);
249
250   memset(filter, 0, sizeof(*filter));
251   filter->pipe = pipe;
252   filter->skip_chroma = skip_chroma;
253   filter->video_width = video_width;
254   filter->video_height = video_height;
255
256   /* TODO: handle other than 4:2:0 subsampling */
257   memset(&templ, 0, sizeof(templ));
258   templ.buffer_format = pipe->screen->get_video_param
259   (
260      pipe->screen,
261      PIPE_VIDEO_PROFILE_UNKNOWN,
262      PIPE_VIDEO_ENTRYPOINT_UNKNOWN,
263      PIPE_VIDEO_CAP_PREFERED_FORMAT
264   );
265   templ.chroma_format = PIPE_VIDEO_CHROMA_FORMAT_420;
266   templ.width = video_width;
267   templ.height = video_height;
268   templ.interlaced = true;
269   filter->video_buffer = vl_video_buffer_create(pipe, &templ);
270   if (!filter->video_buffer)
271      goto error_video_buffer;
272
273   memset(&rs_state, 0, sizeof(rs_state));
274   rs_state.half_pixel_center = true;
275   rs_state.bottom_edge_rule = true;
276   rs_state.depth_clip = 1;
277   filter->rs_state = pipe->create_rasterizer_state(pipe, &rs_state);
278   if (!filter->rs_state)
279      goto error_rs_state;
280
281   memset(&blend, 0, sizeof blend);
282   blend.rt[0].colormask = PIPE_MASK_R;
283   filter->blend[0] = pipe->create_blend_state(pipe, &blend);
284   if (!filter->blend[0])
285      goto error_blendR;
286
287   blend.rt[0].colormask = PIPE_MASK_G;
288   filter->blend[1] = pipe->create_blend_state(pipe, &blend);
289   if (!filter->blend[1])
290      goto error_blendG;
291
292   blend.rt[0].colormask = PIPE_MASK_B;
293   filter->blend[2] = pipe->create_blend_state(pipe, &blend);
294   if (!filter->blend[2])
295      goto error_blendB;
296
297   memset(&sampler, 0, sizeof(sampler));
298   sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
299   sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
300   sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
301   sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
302   sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
303   sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
304   sampler.normalized_coords = 1;
305   filter->sampler[0] = pipe->create_sampler_state(pipe, &sampler);
306   filter->sampler[1] = filter->sampler[2] = filter->sampler[3] = filter->sampler[0];
307   if (!filter->sampler[0])
308      goto error_sampler;
309
310   filter->quad = vl_vb_upload_quads(pipe);
311   if(!filter->quad.buffer)
312      goto error_quad;
313
314   memset(&ve, 0, sizeof(ve));
315   ve.src_offset = 0;
316   ve.instance_divisor = 0;
317   ve.vertex_buffer_index = 0;
318   ve.src_format = PIPE_FORMAT_R32G32_FLOAT;
319   filter->ves = pipe->create_vertex_elements_state(pipe, 1, &ve);
320   if (!filter->ves)
321      goto error_ves;
322
323   sizes.x = 1.0f / video_width;
324   sizes.y = 1.0f / video_height;
325
326   filter->vs = create_vert_shader(filter);
327   if (!filter->vs)
328      goto error_vs;
329
330   filter->fs_copy_top = create_copy_frag_shader(filter, 0);
331   if (!filter->fs_copy_top)
332      goto error_fs_copy_top;
333
334   filter->fs_copy_bottom = create_copy_frag_shader(filter, 1);
335   if (!filter->fs_copy_bottom)
336      goto error_fs_copy_bottom;
337
338   filter->fs_deint_top = create_deint_frag_shader(filter, 0, &sizes, spatial_filter);
339   if (!filter->fs_deint_top)
340      goto error_fs_deint_top;
341
342   filter->fs_deint_bottom = create_deint_frag_shader(filter, 1, &sizes, spatial_filter);
343   if (!filter->fs_deint_bottom)
344      goto error_fs_deint_bottom;
345
346   return true;
347
348error_fs_deint_bottom:
349   pipe->delete_fs_state(pipe, filter->fs_deint_top);
350
351error_fs_deint_top:
352   pipe->delete_fs_state(pipe, filter->fs_copy_bottom);
353
354error_fs_copy_bottom:
355   pipe->delete_fs_state(pipe, filter->fs_copy_top);
356
357error_fs_copy_top:
358   pipe->delete_vs_state(pipe, filter->vs);
359
360error_vs:
361   pipe->delete_vertex_elements_state(pipe, filter->ves);
362
363error_ves:
364   pipe_resource_reference(&filter->quad.buffer, NULL);
365
366error_quad:
367   pipe->delete_sampler_state(pipe, filter->sampler);
368
369error_sampler:
370   pipe->delete_blend_state(pipe, filter->blend[2]);
371
372error_blendB:
373   pipe->delete_blend_state(pipe, filter->blend[1]);
374
375error_blendG:
376   pipe->delete_blend_state(pipe, filter->blend[0]);
377
378error_blendR:
379   pipe->delete_rasterizer_state(pipe, filter->rs_state);
380
381error_rs_state:
382   filter->video_buffer->destroy(filter->video_buffer);
383
384error_video_buffer:
385   return false;
386}
387
388void
389vl_deint_filter_cleanup(struct vl_deint_filter *filter)
390{
391   assert(filter);
392
393   filter->pipe->delete_sampler_state(filter->pipe, filter->sampler[0]);
394   filter->pipe->delete_blend_state(filter->pipe, filter->blend[0]);
395   filter->pipe->delete_blend_state(filter->pipe, filter->blend[1]);
396   filter->pipe->delete_blend_state(filter->pipe, filter->blend[2]);
397   filter->pipe->delete_rasterizer_state(filter->pipe, filter->rs_state);
398   filter->pipe->delete_vertex_elements_state(filter->pipe, filter->ves);
399   pipe_resource_reference(&filter->quad.buffer, NULL);
400
401   filter->pipe->delete_vs_state(filter->pipe, filter->vs);
402   filter->pipe->delete_fs_state(filter->pipe, filter->fs_copy_top);
403   filter->pipe->delete_fs_state(filter->pipe, filter->fs_copy_bottom);
404   filter->pipe->delete_fs_state(filter->pipe, filter->fs_deint_top);
405   filter->pipe->delete_fs_state(filter->pipe, filter->fs_deint_bottom);
406
407   filter->video_buffer->destroy(filter->video_buffer);
408}
409
410bool
411vl_deint_filter_check_buffers(struct vl_deint_filter *filter,
412                              struct pipe_video_buffer *prevprev,
413                              struct pipe_video_buffer *prev,
414                              struct pipe_video_buffer *cur,
415                              struct pipe_video_buffer *next)
416{
417   int i;
418   struct pipe_video_buffer *bufs[] = { prevprev, prev, cur, next };
419
420   for (i = 0; i < 4; i++) {
421      if (bufs[i]->chroma_format != PIPE_VIDEO_CHROMA_FORMAT_420)
422         return false;
423      if (bufs[i]->width < filter->video_width ||
424          bufs[i]->height < filter->video_height)
425         return false;
426      if (!bufs[i]->interlaced)
427         return false;
428   }
429
430   return true;
431}
432
433void
434vl_deint_filter_render(struct vl_deint_filter *filter,
435                       struct pipe_video_buffer *prevprev,
436                       struct pipe_video_buffer *prev,
437                       struct pipe_video_buffer *cur,
438                       struct pipe_video_buffer *next,
439                       unsigned field)
440{
441   struct pipe_viewport_state viewport;
442   struct pipe_framebuffer_state fb_state;
443   struct pipe_sampler_view **cur_sv;
444   struct pipe_sampler_view **prevprev_sv;
445   struct pipe_sampler_view **prev_sv;
446   struct pipe_sampler_view **next_sv;
447   struct pipe_sampler_view *sampler_views[4];
448   struct pipe_surface **dst_surfaces;
449   const unsigned *plane_order;
450   int i;
451   unsigned j;
452
453   assert(filter && prevprev && prev && cur && next && field <= 1);
454
455   /* set up destination and source */
456   dst_surfaces = filter->video_buffer->get_surfaces(filter->video_buffer);
457   plane_order = vl_video_buffer_plane_order(filter->video_buffer->buffer_format);
458   cur_sv = cur->get_sampler_view_components(cur);
459   prevprev_sv = prevprev->get_sampler_view_components(prevprev);
460   prev_sv = prev->get_sampler_view_components(prev);
461   next_sv = next->get_sampler_view_components(next);
462
463   /* set up pipe state */
464   filter->pipe->bind_rasterizer_state(filter->pipe, filter->rs_state);
465   filter->pipe->set_vertex_buffers(filter->pipe, 0, 1, &filter->quad);
466   filter->pipe->bind_vertex_elements_state(filter->pipe, filter->ves);
467   filter->pipe->bind_vs_state(filter->pipe, filter->vs);
468   filter->pipe->bind_sampler_states(filter->pipe, PIPE_SHADER_FRAGMENT,
469                                     0, 4, filter->sampler);
470
471   /* prepare viewport */
472   memset(&viewport, 0, sizeof(viewport));
473   viewport.scale[2] = 1;
474
475   /* prepare framebuffer */
476   memset(&fb_state, 0, sizeof(fb_state));
477   fb_state.nr_cbufs = 1;
478
479   /* process each plane separately */
480   for (i = 0, j = 0; i < VL_NUM_COMPONENTS; ++i) {
481      struct pipe_surface *blit_surf = dst_surfaces[field];
482      struct pipe_surface *dst_surf = dst_surfaces[1 - field];
483      int k = plane_order[i];
484
485      /* bind blend state for this component in the plane */
486      filter->pipe->bind_blend_state(filter->pipe, filter->blend[j]);
487
488      /* update render target state */
489      viewport.scale[0] = blit_surf->texture->width0;
490      viewport.scale[1] = blit_surf->texture->height0;
491      fb_state.width = blit_surf->texture->width0;
492      fb_state.height = blit_surf->texture->height0;
493
494      /* update sampler view sources  */
495      sampler_views[0] = prevprev_sv[k];
496      sampler_views[1] = prev_sv[k];
497      sampler_views[2] = cur_sv[k];
498      sampler_views[3] = next_sv[k];
499      filter->pipe->set_sampler_views(filter->pipe, PIPE_SHADER_FRAGMENT, 0, 4, sampler_views);
500
501      /* blit current field */
502      fb_state.cbufs[0] = blit_surf;
503      filter->pipe->bind_fs_state(filter->pipe, field ? filter->fs_copy_bottom : filter->fs_copy_top);
504      filter->pipe->set_framebuffer_state(filter->pipe, &fb_state);
505      filter->pipe->set_viewport_states(filter->pipe, 0, 1, &viewport);
506      util_draw_arrays(filter->pipe, PIPE_PRIM_QUADS, 0, 4);
507
508      /* blit or interpolate other field */
509      fb_state.cbufs[0] = dst_surf;
510      filter->pipe->set_framebuffer_state(filter->pipe, &fb_state);
511      if (i > 0 && filter->skip_chroma) {
512         util_draw_arrays(filter->pipe, PIPE_PRIM_QUADS, 0, 4);
513      } else {
514         filter->pipe->bind_fs_state(filter->pipe, field ? filter->fs_deint_top : filter->fs_deint_bottom);
515         util_draw_arrays(filter->pipe, PIPE_PRIM_QUADS, 0, 4);
516      }
517
518      if (++j >= util_format_get_nr_components(dst_surf->format)) {
519         dst_surfaces += 2;
520         j = 0;
521      }
522   }
523}
524