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