src/gallium/auxiliary/vl/vl_zscan.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 Christian König
   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
  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 #include <assert.h>
  29
  30 #include "pipe/p_screen.h"
  31 #include "pipe/p_context.h"
  32
  33 #include "util/u_draw.h"
  34 #include "util/u_sampler.h"
  35 #include "util/u_inlines.h"
  36 #include "util/u_memory.h"
  37
  38 #include "tgsi/tgsi_ureg.h"
  39
  40 #include "vl_defines.h"
  41 #include "vl_types.h"
  42
  43 #include "vl_zscan.h"
  44 #include "vl_vertex_buffers.h"
  45
  46 enum VS_OUTPUT
  47 {
  48    VS_O_VPOS = 0,
  49    VS_O_VTEX = 0
  50 };
  51
  52 const int vl_zscan_normal_16[] =
  53 {
  54    /* Zig-Zag scan pattern */
  55     0, 1, 4, 8, 5, 2, 3, 6,
  56     9,12,13,10, 7,11,14,15
  57 };
  58
  59 const int vl_zscan_linear[] =
  60 {
  61    /* Linear scan pattern */
  62     0, 1, 2, 3, 4, 5, 6, 7,
  63     8, 9,10,11,12,13,14,15,
  64    16,17,18,19,20,21,22,23,
  65    24,25,26,27,28,29,30,31,
  66    32,33,34,35,36,37,38,39,
  67    40,41,42,43,44,45,46,47,
  68    48,49,50,51,52,53,54,55,
  69    56,57,58,59,60,61,62,63
  70 };
  71
  72 const int vl_zscan_normal[] =
  73 {
  74    /* Zig-Zag scan pattern */
  75     0, 1, 8,16, 9, 2, 3,10,
  76    17,24,32,25,18,11, 4, 5,
  77    12,19,26,33,40,48,41,34,
  78    27,20,13, 6, 7,14,21,28,
  79    35,42,49,56,57,50,43,36,
  80    29,22,15,23,30,37,44,51,
  81    58,59,52,45,38,31,39,46,
  82    53,60,61,54,47,55,62,63
  83 };
  84
  85 const int vl_zscan_alternate[] =
  86 {
  87    /* Alternate scan pattern */
  88     0, 8,16,24, 1, 9, 2,10,
  89    17,25,32,40,48,56,57,49,
  90    41,33,26,18, 3,11, 4,12,
  91    19,27,34,42,50,58,35,43,
  92    51,59,20,28, 5,13, 6,14,
  93    21,29,36,44,52,60,37,45,
  94    53,61,22,30, 7,15,23,31,
  95    38,46,54,62,39,47,55,63
  96 };
  97
  98 static void *
  99 create_vert_shader(struct vl_zscan *zscan)
 100 {
 101    struct ureg_program *shader;
 102
 103    struct ureg_src scale;
 104    struct ureg_src vrect, vpos, block_num;
 105
 106    struct ureg_dst tmp;
 107    struct ureg_dst o_vpos;
 108    struct ureg_dst *o_vtex;
 109
 110    signed i;
 111
 112    shader = ureg_create(PIPE_SHADER_VERTEX);
 113    if (!shader)
 114       return NULL;
 115
 116    o_vtex = MALLOC(zscan->num_channels * sizeof(struct ureg_dst));
 117
 118    scale = ureg_imm2f(shader,
 119       (float)VL_BLOCK_WIDTH / zscan->buffer_width,
 120       (float)VL_BLOCK_HEIGHT / zscan->buffer_height);
 121
 122    vrect = ureg_DECL_vs_input(shader, VS_I_RECT);
 123    vpos = ureg_DECL_vs_input(shader, VS_I_VPOS);
 124    block_num = ureg_DECL_vs_input(shader, VS_I_BLOCK_NUM);
 125
 126    tmp = ureg_DECL_temporary(shader);
 127
 128    o_vpos = ureg_DECL_output(shader, TGSI_SEMANTIC_POSITION, VS_O_VPOS);
 129
 130    for (i = 0; i < zscan->num_channels; ++i)
 131       o_vtex[i] = ureg_DECL_output(shader, TGSI_SEMANTIC_GENERIC, VS_O_VTEX + i);
 132
 133    /*
 134     * o_vpos.xy = (vpos + vrect) * scale
 135     * o_vpos.zw = 1.0f
 136     *
 137     * tmp.xy = InstanceID / blocks_per_line
 138     * tmp.x = frac(tmp.x)
 139     * tmp.y = floor(tmp.y)
 140     *
 141     * o_vtex.x = vrect.x / blocks_per_line + tmp.x
 142     * o_vtex.y = vrect.y
 143     * o_vtex.z = tmp.z * blocks_per_line / blocks_total
 144     */
 145    ureg_ADD(shader, ureg_writemask(tmp, TGSI_WRITEMASK_XY), vpos, vrect);
 146    ureg_MUL(shader, ureg_writemask(o_vpos, TGSI_WRITEMASK_XY), ureg_src(tmp), scale);
 147    ureg_MOV(shader, ureg_writemask(o_vpos, TGSI_WRITEMASK_ZW), ureg_imm1f(shader, 1.0f));
 148
 149    ureg_MUL(shader, ureg_writemask(tmp, TGSI_WRITEMASK_XW), ureg_scalar(block_num, TGSI_SWIZZLE_X),
 150             ureg_imm1f(shader, 1.0f / zscan->blocks_per_line));
 151
 152    ureg_FRC(shader, ureg_writemask(tmp, TGSI_WRITEMASK_Y), ureg_scalar(ureg_src(tmp), TGSI_SWIZZLE_X));
 153    ureg_FLR(shader, ureg_writemask(tmp, TGSI_WRITEMASK_W), ureg_src(tmp));
 154
 155    for (i = 0; i < zscan->num_channels; ++i) {
 156       ureg_ADD(shader, ureg_writemask(tmp, TGSI_WRITEMASK_X), ureg_scalar(ureg_src(tmp), TGSI_SWIZZLE_Y),
 157                ureg_imm1f(shader, 1.0f / (zscan->blocks_per_line * VL_BLOCK_WIDTH)
 158                 * (i - (signed)zscan->num_channels / 2)));
 159
 160       ureg_MAD(shader, ureg_writemask(o_vtex[i], TGSI_WRITEMASK_X), vrect,
 161                ureg_imm1f(shader, 1.0f / zscan->blocks_per_line), ureg_src(tmp));
 162       ureg_MOV(shader, ureg_writemask(o_vtex[i], TGSI_WRITEMASK_Y), vrect);
 163       ureg_MOV(shader, ureg_writemask(o_vtex[i], TGSI_WRITEMASK_Z), vpos);
 164       ureg_MUL(shader, ureg_writemask(o_vtex[i], TGSI_WRITEMASK_W), ureg_src(tmp),
 165                ureg_imm1f(shader, (float)zscan->blocks_per_line / zscan->blocks_total));
 166    }
 167
 168    ureg_release_temporary(shader, tmp);
 169    ureg_END(shader);
 170
 171    FREE(o_vtex);
 172
 173    return ureg_create_shader_and_destroy(shader, zscan->pipe);
 174 }
 175
 176 static void *
 177 create_frag_shader(struct vl_zscan *zscan)
 178 {
 179    struct ureg_program *shader;
 180    struct ureg_src *vtex;
 181
 182    struct ureg_src samp_src, samp_scan, samp_quant;
 183
 184    struct ureg_dst *tmp;
 185    struct ureg_dst quant, fragment;
 186
 187    unsigned i;
 188
 189    shader = ureg_create(PIPE_SHADER_FRAGMENT);
 190    if (!shader)
 191       return NULL;
 192
 193    vtex = MALLOC(zscan->num_channels * sizeof(struct ureg_src));
 194    tmp = MALLOC(zscan->num_channels * sizeof(struct ureg_dst));
 195
 196    for (i = 0; i < zscan->num_channels; ++i)
 197       vtex[i] = ureg_DECL_fs_input(shader, TGSI_SEMANTIC_GENERIC, VS_O_VTEX + i, TGSI_INTERPOLATE_LINEAR);
 198
 199    samp_src = ureg_DECL_sampler(shader, 0);
 200    samp_scan = ureg_DECL_sampler(shader, 1);
 201    samp_quant = ureg_DECL_sampler(shader, 2);
 202
 203    for (i = 0; i < zscan->num_channels; ++i)
 204       tmp[i] = ureg_DECL_temporary(shader);
 205    quant = ureg_DECL_temporary(shader);
 206
 207    fragment = ureg_DECL_output(shader, TGSI_SEMANTIC_COLOR, 0);
 208
 209    /*
 210     * tmp.x = tex(vtex, 1)
 211     * tmp.y = vtex.z
 212     * fragment = tex(tmp, 0) * quant
 213     */
 214    for (i = 0; i < zscan->num_channels; ++i)
 215       ureg_TEX(shader, ureg_writemask(tmp[i], TGSI_WRITEMASK_X), TGSI_TEXTURE_2D, vtex[i], samp_scan);
 216
 217    for (i = 0; i < zscan->num_channels; ++i)
 218       ureg_MOV(shader, ureg_writemask(tmp[i], TGSI_WRITEMASK_Y), ureg_scalar(vtex[i], TGSI_SWIZZLE_W));
 219
 220    for (i = 0; i < zscan->num_channels; ++i) {
 221       ureg_TEX(shader, ureg_writemask(tmp[0], TGSI_WRITEMASK_X << i), TGSI_TEXTURE_2D, ureg_src(tmp[i]), samp_src);
 222       ureg_TEX(shader, ureg_writemask(quant, TGSI_WRITEMASK_X << i), TGSI_TEXTURE_3D, vtex[i], samp_quant);
 223    }
 224
 225    ureg_MUL(shader, quant, ureg_src(quant), ureg_imm1f(shader, 16.0f));
 226    ureg_MUL(shader, fragment, ureg_src(tmp[0]), ureg_src(quant));
 227
 228    for (i = 0; i < zscan->num_channels; ++i)
 229       ureg_release_temporary(shader, tmp[i]);
 230    ureg_END(shader);
 231
 232    FREE(vtex);
 233    FREE(tmp);
 234
 235    return ureg_create_shader_and_destroy(shader, zscan->pipe);
 236 }
 237
 238 static bool
 239 init_shaders(struct vl_zscan *zscan)
 240 {
 241    assert(zscan);
 242
 243    zscan->vs = create_vert_shader(zscan);
 244    if (!zscan->vs)
 245       goto error_vs;
 246
 247    zscan->fs = create_frag_shader(zscan);
 248    if (!zscan->fs)
 249       goto error_fs;
 250
 251    return true;
 252
 253 error_fs:
 254    zscan->pipe->delete_vs_state(zscan->pipe, zscan->vs);
 255
 256 error_vs:
 257    return false;
 258 }
 259
 260 static void
 261 cleanup_shaders(struct vl_zscan *zscan)
 262 {
 263    assert(zscan);
 264
 265    zscan->pipe->delete_vs_state(zscan->pipe, zscan->vs);
 266    zscan->pipe->delete_fs_state(zscan->pipe, zscan->fs);
 267 }
 268
 269 static bool
 270 init_state(struct vl_zscan *zscan)
 271 {
 272    struct pipe_blend_state blend;
 273    struct pipe_rasterizer_state rs_state;
 274    struct pipe_sampler_state sampler;
 275    unsigned i;
 276
 277    assert(zscan);
 278
 279    memset(&rs_state, 0, sizeof(rs_state));
 280    rs_state.half_pixel_center = true;
 281    rs_state.bottom_edge_rule = true;
 282    rs_state.depth_clip = 1;
 283    zscan->rs_state = zscan->pipe->create_rasterizer_state(zscan->pipe, &rs_state);
 284    if (!zscan->rs_state)
 285       goto error_rs_state;
 286
 287    memset(&blend, 0, sizeof blend);
 288
 289    blend.independent_blend_enable = 0;
 290    blend.rt[0].blend_enable = 0;
 291    blend.rt[0].rgb_func = PIPE_BLEND_ADD;
 292    blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 293    blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
 294    blend.rt[0].alpha_func = PIPE_BLEND_ADD;
 295    blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 296    blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
 297    blend.logicop_enable = 0;
 298    blend.logicop_func = PIPE_LOGICOP_CLEAR;
 299    /* Needed to allow color writes to FB, even if blending disabled */
 300    blend.rt[0].colormask = PIPE_MASK_RGBA;
 301    blend.dither = 0;
 302    zscan->blend = zscan->pipe->create_blend_state(zscan->pipe, &blend);
 303    if (!zscan->blend)
 304       goto error_blend;
 305
 306    for (i = 0; i < 3; ++i) {
 307       memset(&sampler, 0, sizeof(sampler));
 308       sampler.wrap_s = PIPE_TEX_WRAP_REPEAT;
 309       sampler.wrap_t = PIPE_TEX_WRAP_REPEAT;
 310       sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 311       sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 312       sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 313       sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 314       sampler.compare_mode = PIPE_TEX_COMPARE_NONE;
 315       sampler.compare_func = PIPE_FUNC_ALWAYS;
 316       sampler.normalized_coords = 1;
 317       zscan->samplers[i] = zscan->pipe->create_sampler_state(zscan->pipe, &sampler);
 318       if (!zscan->samplers[i])
 319          goto error_samplers;
 320    }
 321
 322    return true;
 323
 324 error_samplers:
 325    for (i = 0; i < 2; ++i)
 326       if (zscan->samplers[i])
 327          zscan->pipe->delete_sampler_state(zscan->pipe, zscan->samplers[i]);
 328
 329    zscan->pipe->delete_rasterizer_state(zscan->pipe, zscan->rs_state);
 330
 331 error_blend:
 332    zscan->pipe->delete_blend_state(zscan->pipe, zscan->blend);
 333
 334 error_rs_state:
 335    return false;
 336 }
 337
 338 static void
 339 cleanup_state(struct vl_zscan *zscan)
 340 {
 341    unsigned i;
 342
 343    assert(zscan);
 344
 345    for (i = 0; i < 3; ++i)
 346       zscan->pipe->delete_sampler_state(zscan->pipe, zscan->samplers[i]);
 347
 348    zscan->pipe->delete_rasterizer_state(zscan->pipe, zscan->rs_state);
 349    zscan->pipe->delete_blend_state(zscan->pipe, zscan->blend);
 350 }
 351
 352 struct pipe_sampler_view *
 353 vl_zscan_layout(struct pipe_context *pipe, const int layout[64], unsigned blocks_per_line)
 354 {
 355    const unsigned total_size = blocks_per_line * VL_BLOCK_WIDTH * VL_BLOCK_HEIGHT;
 356
 357    int patched_layout[64];
 358
 359    struct pipe_resource res_tmpl, *res;
 360    struct pipe_sampler_view sv_tmpl, *sv;
 361    struct pipe_transfer *buf_transfer;
 362    unsigned x, y, i, pitch;
 363    float *f;
 364
 365    struct pipe_box rect =
 366    {
 367       0, 0, 0,
 368       VL_BLOCK_WIDTH * blocks_per_line,
 369       VL_BLOCK_HEIGHT,
 370       1
 371    };
 372
 373    assert(pipe && layout && blocks_per_line);
 374
 375    for (i = 0; i < 64; ++i)
 376       patched_layout[layout[i]] = i;
 377
 378    memset(&res_tmpl, 0, sizeof(res_tmpl));
 379    res_tmpl.target = PIPE_TEXTURE_2D;
 380    res_tmpl.format = PIPE_FORMAT_R32_FLOAT;
 381    res_tmpl.width0 = VL_BLOCK_WIDTH * blocks_per_line;
 382    res_tmpl.height0 = VL_BLOCK_HEIGHT;
 383    res_tmpl.depth0 = 1;
 384    res_tmpl.array_size = 1;
 385    res_tmpl.usage = PIPE_USAGE_IMMUTABLE;
 386    res_tmpl.bind = PIPE_BIND_SAMPLER_VIEW;
 387
 388    res = pipe->screen->resource_create(pipe->screen, &res_tmpl);
 389    if (!res)
 390       goto error_resource;
 391
 392    f = pipe->transfer_map(pipe, res,
 393                           0, PIPE_TRANSFER_WRITE | PIPE_TRANSFER_DISCARD_RANGE,
 394                           &rect, &buf_transfer);
 395    if (!f)
 396       goto error_map;
 397
 398    pitch = buf_transfer->stride / sizeof(float);
 399
 400    for (i = 0; i < blocks_per_line; ++i)
 401       for (y = 0; y < VL_BLOCK_HEIGHT; ++y)
 402          for (x = 0; x < VL_BLOCK_WIDTH; ++x) {
 403             float addr = patched_layout[x + y * VL_BLOCK_WIDTH] +
 404                i * VL_BLOCK_WIDTH * VL_BLOCK_HEIGHT;
 405
 406             addr /= total_size;
 407
 408             f[i * VL_BLOCK_WIDTH + y * pitch + x] = addr;
 409          }
 410
 411    pipe->transfer_unmap(pipe, buf_transfer);
 412
 413    memset(&sv_tmpl, 0, sizeof(sv_tmpl));
 414    u_sampler_view_default_template(&sv_tmpl, res, res->format);
 415    sv = pipe->create_sampler_view(pipe, res, &sv_tmpl);
 416    pipe_resource_reference(&res, NULL);
 417    if (!sv)
 418       goto error_map;
 419
 420    return sv;
 421
 422 error_map:
 423    pipe_resource_reference(&res, NULL);
 424
 425 error_resource:
 426    return NULL;
 427 }
 428
 429 bool
 430 vl_zscan_init(struct vl_zscan *zscan, struct pipe_context *pipe,
 431               unsigned buffer_width, unsigned buffer_height,
 432               unsigned blocks_per_line, unsigned blocks_total,
 433               unsigned num_channels)
 434 {
 435    assert(zscan && pipe);
 436
 437    zscan->pipe = pipe;
 438    zscan->buffer_width = buffer_width;
 439    zscan->buffer_height = buffer_height;
 440    zscan->num_channels = num_channels;
 441    zscan->blocks_per_line = blocks_per_line;
 442    zscan->blocks_total = blocks_total;
 443
 444    if(!init_shaders(zscan))
 445       return false;
 446
 447    if(!init_state(zscan)) {
 448       cleanup_shaders(zscan);
 449       return false;
 450    }
 451
 452    return true;
 453 }
 454
 455 void
 456 vl_zscan_cleanup(struct vl_zscan *zscan)
 457 {
 458    assert(zscan);
 459
 460    cleanup_shaders(zscan);
 461    cleanup_state(zscan);
 462 }
 463
 464 bool
 465 vl_zscan_init_buffer(struct vl_zscan *zscan, struct vl_zscan_buffer *buffer,
 466                      struct pipe_sampler_view *src, struct pipe_surface *dst)
 467 {
 468    struct pipe_resource res_tmpl, *res;
 469    struct pipe_sampler_view sv_tmpl;
 470
 471    assert(zscan && buffer);
 472
 473    memset(buffer, 0, sizeof(struct vl_zscan_buffer));
 474
 475    pipe_sampler_view_reference(&buffer->src, src);
 476
 477    buffer->viewport.scale[0] = dst->width;
 478    buffer->viewport.scale[1] = dst->height;
 479    buffer->viewport.scale[2] = 1;
 480    buffer->viewport.translate[0] = 0;
 481    buffer->viewport.translate[1] = 0;
 482    buffer->viewport.translate[2] = 0;
 483
 484    buffer->fb_state.width = dst->width;
 485    buffer->fb_state.height = dst->height;
 486    buffer->fb_state.nr_cbufs = 1;
 487    pipe_surface_reference(&buffer->fb_state.cbufs[0], dst);
 488
 489    memset(&res_tmpl, 0, sizeof(res_tmpl));
 490    res_tmpl.target = PIPE_TEXTURE_3D;
 491    res_tmpl.format = PIPE_FORMAT_R8_UNORM;
 492    res_tmpl.width0 = VL_BLOCK_WIDTH * zscan->blocks_per_line;
 493    res_tmpl.height0 = VL_BLOCK_HEIGHT;
 494    res_tmpl.depth0 = 2;
 495    res_tmpl.array_size = 1;
 496    res_tmpl.usage = PIPE_USAGE_IMMUTABLE;
 497    res_tmpl.bind = PIPE_BIND_SAMPLER_VIEW;
 498
 499    res = zscan->pipe->screen->resource_create(zscan->pipe->screen, &res_tmpl);
 500    if (!res)
 501       return false;
 502
 503    memset(&sv_tmpl, 0, sizeof(sv_tmpl));
 504    u_sampler_view_default_template(&sv_tmpl, res, res->format);
 505    sv_tmpl.swizzle_r = sv_tmpl.swizzle_g = sv_tmpl.swizzle_b = sv_tmpl.swizzle_a = TGSI_SWIZZLE_X;
 506    buffer->quant = zscan->pipe->create_sampler_view(zscan->pipe, res, &sv_tmpl);
 507    pipe_resource_reference(&res, NULL);
 508    if (!buffer->quant)
 509       return false;
 510
 511    return true;
 512 }
 513
 514 void
 515 vl_zscan_cleanup_buffer(struct vl_zscan_buffer *buffer)
 516 {
 517    assert(buffer);
 518
 519    pipe_sampler_view_reference(&buffer->src, NULL);
 520    pipe_sampler_view_reference(&buffer->layout, NULL);
 521    pipe_sampler_view_reference(&buffer->quant, NULL);
 522    pipe_surface_reference(&buffer->fb_state.cbufs[0], NULL);
 523 }
 524
 525 void
 526 vl_zscan_set_layout(struct vl_zscan_buffer *buffer, struct pipe_sampler_view *layout)
 527 {
 528    assert(buffer);
 529    assert(layout);
 530
 531    pipe_sampler_view_reference(&buffer->layout, layout);
 532 }
 533
 534 void
 535 vl_zscan_upload_quant(struct vl_zscan *zscan, struct vl_zscan_buffer *buffer,
 536                       const uint8_t matrix[64], bool intra)
 537 {
 538    struct pipe_context *pipe;
 539    struct pipe_transfer *buf_transfer;
 540    unsigned x, y, i, pitch;
 541    uint8_t *data;
 542
 543    struct pipe_box rect =
 544    {
 545       0, 0, intra ? 1 : 0,
 546       VL_BLOCK_WIDTH,
 547       VL_BLOCK_HEIGHT,
 548       1
 549    };
 550
 551    assert(buffer);
 552    assert(matrix);
 553
 554    pipe = zscan->pipe;
 555
 556    rect.width *= zscan->blocks_per_line;
 557
 558    data = pipe->transfer_map(pipe, buffer->quant->texture,
 559                              0, PIPE_TRANSFER_WRITE |
 560                              PIPE_TRANSFER_DISCARD_RANGE,
 561                              &rect, &buf_transfer);
 562    if (!data)
 563       return;
 564
 565    pitch = buf_transfer->stride;
 566
 567    for (i = 0; i < zscan->blocks_per_line; ++i)
 568       for (y = 0; y < VL_BLOCK_HEIGHT; ++y)
 569          for (x = 0; x < VL_BLOCK_WIDTH; ++x)
 570             data[i * VL_BLOCK_WIDTH + y * pitch + x] = matrix[x + y * VL_BLOCK_WIDTH];
 571
 572    pipe->transfer_unmap(pipe, buf_transfer);
 573 }
 574
 575 void
 576 vl_zscan_render(struct vl_zscan *zscan, struct vl_zscan_buffer *buffer, unsigned num_instances)
 577 {
 578    assert(buffer);
 579
 580    zscan->pipe->bind_rasterizer_state(zscan->pipe, zscan->rs_state);
 581    zscan->pipe->bind_blend_state(zscan->pipe, zscan->blend);
 582    zscan->pipe->bind_sampler_states(zscan->pipe, PIPE_SHADER_FRAGMENT,
 583                                     0, 3, zscan->samplers);
 584    zscan->pipe->set_framebuffer_state(zscan->pipe, &buffer->fb_state);
 585    zscan->pipe->set_viewport_states(zscan->pipe, 0, 1, &buffer->viewport);
 586    zscan->pipe->set_sampler_views(zscan->pipe, PIPE_SHADER_FRAGMENT,
 587                                   0, 3, &buffer->src);
 588    zscan->pipe->bind_vs_state(zscan->pipe, zscan->vs);
 589    zscan->pipe->bind_fs_state(zscan->pipe, zscan->fs);
 590    util_draw_arrays_instanced(zscan->pipe, PIPE_PRIM_QUADS, 0, 4, 0, num_instances);
 591 }