src/gallium/auxiliary/util/u_blit.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   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 /**
  29  * @file
  30  * Copy/blit pixel rect between surfaces
  31  *
  32  * @author Brian Paul
  33  */
  34
  35
  36 #include "pipe/p_context.h"
  37 #include "util/u_debug.h"
  38 #include "pipe/p_defines.h"
  39 #include "util/u_inlines.h"
  40 #include "pipe/p_shader_tokens.h"
  41 #include "pipe/p_state.h"
  42
  43 #include "util/u_blit.h"
  44 #include "util/u_draw_quad.h"
  45 #include "util/u_format.h"
  46 #include "util/u_math.h"
  47 #include "util/u_memory.h"
  48 #include "util/u_sampler.h"
  49 #include "util/u_texture.h"
  50 #include "util/u_simple_shaders.h"
  51
  52 #include "cso_cache/cso_context.h"
  53
  54
  55 struct blit_state
  56 {
  57    struct pipe_context *pipe;
  58    struct cso_context *cso;
  59
  60    struct pipe_blend_state blend_write_color;
  61    struct pipe_depth_stencil_alpha_state dsa_keep_depthstencil;
  62    struct pipe_rasterizer_state rasterizer;
  63    struct pipe_sampler_state sampler;
  64    struct pipe_viewport_state viewport;
  65    struct pipe_vertex_element velem[2];
  66
  67    void *vs;
  68    void *fs[PIPE_MAX_TEXTURE_TYPES][TGSI_WRITEMASK_XYZW + 1][3];
  69
  70    struct pipe_resource *vbuf;  /**< quad vertices */
  71    unsigned vbuf_slot;
  72
  73    float vertices[4][2][4];   /**< vertex/texcoords for quad */
  74 };
  75
  76
  77 /**
  78  * Create state object for blit.
  79  * Intended to be created once and re-used for many blit() calls.
  80  */
  81 struct blit_state *
  82 util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
  83 {
  84    struct blit_state *ctx;
  85    uint i;
  86
  87    ctx = CALLOC_STRUCT(blit_state);
  88    if (!ctx)
  89       return NULL;
  90
  91    ctx->pipe = pipe;
  92    ctx->cso = cso;
  93
  94    /* disabled blending/masking */
  95    ctx->blend_write_color.rt[0].colormask = PIPE_MASK_RGBA;
  96
  97    /* rasterizer */
  98    ctx->rasterizer.cull_face = PIPE_FACE_NONE;
  99    ctx->rasterizer.half_pixel_center = 1;
 100    ctx->rasterizer.bottom_edge_rule = 1;
 101    ctx->rasterizer.depth_clip = 1;
 102
 103    /* samplers */
 104    ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 105    ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 106    ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 107    ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 108    ctx->sampler.min_img_filter = 0; /* set later */
 109    ctx->sampler.mag_img_filter = 0; /* set later */
 110
 111    /* vertex elements state */
 112    for (i = 0; i < 2; i++) {
 113       ctx->velem[i].src_offset = i * 4 * sizeof(float);
 114       ctx->velem[i].instance_divisor = 0;
 115       ctx->velem[i].vertex_buffer_index = cso_get_aux_vertex_buffer_slot(cso);
 116       ctx->velem[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 117    }
 118
 119    ctx->vbuf = NULL;
 120
 121    /* init vertex data that doesn't change */
 122    for (i = 0; i < 4; i++) {
 123       ctx->vertices[i][0][3] = 1.0f; /* w */
 124       ctx->vertices[i][1][3] = 1.0f; /* q */
 125    }
 126
 127    return ctx;
 128 }
 129
 130
 131 /**
 132  * Destroy a blit context
 133  */
 134 void
 135 util_destroy_blit(struct blit_state *ctx)
 136 {
 137    struct pipe_context *pipe = ctx->pipe;
 138    unsigned i, j, k;
 139
 140    if (ctx->vs)
 141       pipe->delete_vs_state(pipe, ctx->vs);
 142
 143    for (i = 0; i < Elements(ctx->fs); i++) {
 144       for (j = 0; j < Elements(ctx->fs[i]); j++) {
 145          for (k = 0; k < Elements(ctx->fs[i][j]); k++) {
 146             if (ctx->fs[i][j][k])
 147                pipe->delete_fs_state(pipe, ctx->fs[i][j][k]);
 148          }
 149       }
 150    }
 151
 152    pipe_resource_reference(&ctx->vbuf, NULL);
 153
 154    FREE(ctx);
 155 }
 156
 157
 158 /**
 159  * Helper function to set the fragment shaders.
 160  */
 161 static inline void
 162 set_fragment_shader(struct blit_state *ctx, uint writemask,
 163                     enum pipe_format format,
 164                     enum pipe_texture_target pipe_tex)
 165 {
 166    enum tgsi_return_type stype;
 167    unsigned idx;
 168
 169    if (util_format_is_pure_uint(format)) {
 170       stype = TGSI_RETURN_TYPE_UINT;
 171       idx = 0;
 172    } else if (util_format_is_pure_sint(format)) {
 173       stype = TGSI_RETURN_TYPE_SINT;
 174       idx = 1;
 175    } else {
 176       stype = TGSI_RETURN_TYPE_FLOAT;
 177       idx = 2;
 178    }
 179
 180    if (!ctx->fs[pipe_tex][writemask][idx]) {
 181       unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(pipe_tex, 0);
 182
 183       ctx->fs[pipe_tex][writemask][idx] =
 184          util_make_fragment_tex_shader_writemask(ctx->pipe, tgsi_tex,
 185                                                  TGSI_INTERPOLATE_LINEAR,
 186                                                  writemask,
 187                                                  stype);
 188    }
 189
 190    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[pipe_tex][writemask][idx]);
 191 }
 192
 193
 194 /**
 195  * Helper function to set the vertex shader.
 196  */
 197 static inline void
 198 set_vertex_shader(struct blit_state *ctx)
 199 {
 200    /* vertex shader - still required to provide the linkage between
 201     * fragment shader input semantics and vertex_element/buffers.
 202     */
 203    if (!ctx->vs) {
 204       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 205                                       TGSI_SEMANTIC_GENERIC };
 206       const uint semantic_indexes[] = { 0, 0 };
 207       ctx->vs = util_make_vertex_passthrough_shader(ctx->pipe, 2,
 208                                                     semantic_names,
 209                                                     semantic_indexes, FALSE);
 210    }
 211
 212    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 213 }
 214
 215
 216 /**
 217  * Get offset of next free slot in vertex buffer for quad vertices.
 218  */
 219 static unsigned
 220 get_next_slot( struct blit_state *ctx )
 221 {
 222    const unsigned max_slots = 4096 / sizeof ctx->vertices;
 223
 224    if (ctx->vbuf_slot >= max_slots) {
 225       pipe_resource_reference(&ctx->vbuf, NULL);
 226       ctx->vbuf_slot = 0;
 227    }
 228
 229    if (!ctx->vbuf) {
 230       ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
 231                                      PIPE_BIND_VERTEX_BUFFER,
 232                                      PIPE_USAGE_STREAM,
 233                                      max_slots * sizeof ctx->vertices);
 234    }
 235
 236    return ctx->vbuf_slot++ * sizeof ctx->vertices;
 237 }
 238
 239
 240
 241
 242 /**
 243  * Setup vertex data for the textured quad we'll draw.
 244  * Note: y=0=top
 245  *
 246  * FIXME: We should call util_map_texcoords2d_onto_cubemap
 247  * for cubemaps.
 248  */
 249 static unsigned
 250 setup_vertex_data_tex(struct blit_state *ctx,
 251                       unsigned src_target,
 252                       unsigned src_face,
 253                       float x0, float y0, float x1, float y1,
 254                       float s0, float t0, float s1, float t1,
 255                       float z)
 256 {
 257    unsigned offset;
 258
 259    ctx->vertices[0][0][0] = x0;
 260    ctx->vertices[0][0][1] = y0;
 261    ctx->vertices[0][0][2] = z;
 262    ctx->vertices[0][1][0] = s0; /*s*/
 263    ctx->vertices[0][1][1] = t0; /*t*/
 264    ctx->vertices[0][1][2] = 0;  /*r*/
 265
 266    ctx->vertices[1][0][0] = x1;
 267    ctx->vertices[1][0][1] = y0;
 268    ctx->vertices[1][0][2] = z;
 269    ctx->vertices[1][1][0] = s1; /*s*/
 270    ctx->vertices[1][1][1] = t0; /*t*/
 271    ctx->vertices[1][1][2] = 0;  /*r*/
 272
 273    ctx->vertices[2][0][0] = x1;
 274    ctx->vertices[2][0][1] = y1;
 275    ctx->vertices[2][0][2] = z;
 276    ctx->vertices[2][1][0] = s1;
 277    ctx->vertices[2][1][1] = t1;
 278    ctx->vertices[3][1][2] = 0;
 279
 280    ctx->vertices[3][0][0] = x0;
 281    ctx->vertices[3][0][1] = y1;
 282    ctx->vertices[3][0][2] = z;
 283    ctx->vertices[3][1][0] = s0;
 284    ctx->vertices[3][1][1] = t1;
 285    ctx->vertices[3][1][2] = 0;
 286
 287    if (src_target == PIPE_TEXTURE_CUBE ||
 288        src_target == PIPE_TEXTURE_CUBE_ARRAY) {
 289       /* Map cubemap texture coordinates inplace. */
 290       const unsigned stride = sizeof ctx->vertices[0] / sizeof ctx->vertices[0][0][0];
 291       util_map_texcoords2d_onto_cubemap(src_face,
 292                                         &ctx->vertices[0][1][0], stride,
 293                                         &ctx->vertices[0][1][0], stride,
 294                                         TRUE);
 295    }
 296
 297    offset = get_next_slot( ctx );
 298
 299    if (ctx->vbuf) {
 300       pipe_buffer_write_nooverlap(ctx->pipe, ctx->vbuf,
 301                                   offset, sizeof(ctx->vertices), ctx->vertices);
 302    }
 303
 304    return offset;
 305 }
 306
 307
 308 /**
 309  * \return TRUE if two regions overlap, FALSE otherwise
 310  */
 311 static boolean
 312 regions_overlap(int srcX0, int srcY0,
 313                 int srcX1, int srcY1,
 314                 int dstX0, int dstY0,
 315                 int dstX1, int dstY1)
 316 {
 317    if (MAX2(srcX0, srcX1) < MIN2(dstX0, dstX1))
 318       return FALSE; /* src completely left of dst */
 319
 320    if (MAX2(dstX0, dstX1) < MIN2(srcX0, srcX1))
 321       return FALSE; /* dst completely left of src */
 322
 323    if (MAX2(srcY0, srcY1) < MIN2(dstY0, dstY1))
 324       return FALSE; /* src completely above dst */
 325
 326    if (MAX2(dstY0, dstY1) < MIN2(srcY0, srcY1))
 327       return FALSE; /* dst completely above src */
 328
 329    return TRUE; /* some overlap */
 330 }
 331
 332
 333 /**
 334  * Can we blit from src format to dest format with a simple copy?
 335  */
 336 static boolean
 337 formats_compatible(enum pipe_format src_format,
 338                    enum pipe_format dst_format)
 339 {
 340    if (src_format == dst_format) {
 341       return TRUE;
 342    }
 343    else {
 344       const struct util_format_description *src_desc =
 345          util_format_description(src_format);
 346       const struct util_format_description *dst_desc =
 347          util_format_description(dst_format);
 348       return util_is_format_compatible(src_desc, dst_desc);
 349    }
 350 }
 351
 352
 353 /**
 354  * Copy pixel block from src surface to dst surface.
 355  * Overlapping regions are acceptable.
 356  * Flipping and stretching are supported.
 357  * \param filter  one of PIPE_TEX_FILTER_NEAREST/LINEAR
 358  * \param writemask  bitmask of PIPE_MASK_[RGBAZS].  Controls which channels
 359  *                   in the dest surface are sourced from the src surface.
 360  *                   Disabled color channels are sourced from (0,0,0,1).
 361  */
 362 void
 363 util_blit_pixels(struct blit_state *ctx,
 364                  struct pipe_resource *src_tex,
 365                  unsigned src_level,
 366                  int srcX0, int srcY0,
 367                  int srcX1, int srcY1,
 368                  int srcZ0,
 369                  struct pipe_surface *dst,
 370                  int dstX0, int dstY0,
 371                  int dstX1, int dstY1,
 372                  float z, uint filter,
 373                  uint writemask)
 374 {
 375    struct pipe_context *pipe = ctx->pipe;
 376    enum pipe_format src_format, dst_format;
 377    const int srcW = abs(srcX1 - srcX0);
 378    const int srcH = abs(srcY1 - srcY0);
 379    boolean overlap;
 380    boolean is_stencil, is_depth, blit_depth, blit_stencil;
 381    const struct util_format_description *src_desc =
 382          util_format_description(src_tex->format);
 383    struct pipe_blit_info info;
 384
 385    assert(filter == PIPE_TEX_FILTER_NEAREST ||
 386           filter == PIPE_TEX_FILTER_LINEAR);
 387
 388    assert(src_level <= src_tex->last_level);
 389
 390    /* do the regions overlap? */
 391    overlap = src_tex == dst->texture &&
 392              dst->u.tex.level == src_level &&
 393              dst->u.tex.first_layer == srcZ0 &&
 394       regions_overlap(srcX0, srcY0, srcX1, srcY1,
 395                       dstX0, dstY0, dstX1, dstY1);
 396
 397    src_format = util_format_linear(src_tex->format);
 398    dst_format = util_format_linear(dst->texture->format);
 399
 400    /* See whether we will blit depth or stencil. */
 401    is_depth = util_format_has_depth(src_desc);
 402    is_stencil = util_format_has_stencil(src_desc);
 403
 404    blit_depth = is_depth && (writemask & PIPE_MASK_Z);
 405    blit_stencil = is_stencil && (writemask & PIPE_MASK_S);
 406
 407    if (is_depth || is_stencil) {
 408       assert((writemask & PIPE_MASK_RGBA) == 0);
 409       assert(blit_depth || blit_stencil);
 410    }
 411    else {
 412       assert((writemask & PIPE_MASK_ZS) == 0);
 413       assert(!blit_depth);
 414       assert(!blit_stencil);
 415    }
 416
 417    /*
 418     * XXX: z parameter is deprecated. dst->u.tex.first_layer
 419     * specificies the destination layer.
 420     */
 421    assert(z == 0.0f);
 422
 423    /*
 424     * Check for simple case:  no format conversion, no flipping, no stretching,
 425     * no overlapping, same number of samples.
 426     * Filter mode should not matter since there's no stretching.
 427     */
 428    if (formats_compatible(src_format, dst_format) &&
 429        src_tex->nr_samples == dst->texture->nr_samples &&
 430        is_stencil == blit_stencil &&
 431        is_depth == blit_depth &&
 432        srcX0 < srcX1 &&
 433        dstX0 < dstX1 &&
 434        srcY0 < srcY1 &&
 435        dstY0 < dstY1 &&
 436        (dstX1 - dstX0) == (srcX1 - srcX0) &&
 437        (dstY1 - dstY0) == (srcY1 - srcY0) &&
 438        !overlap) {
 439       struct pipe_box src_box;
 440       src_box.x = srcX0;
 441       src_box.y = srcY0;
 442       src_box.z = srcZ0;
 443       src_box.width = srcW;
 444       src_box.height = srcH;
 445       src_box.depth = 1;
 446       pipe->resource_copy_region(pipe,
 447                                  dst->texture, dst->u.tex.level,
 448                                  dstX0, dstY0, dst->u.tex.first_layer,/* dest */
 449                                  src_tex, src_level,
 450                                  &src_box);
 451       return;
 452    }
 453
 454    memset(&info, 0, sizeof info);
 455    info.dst.resource = dst->texture;
 456    info.dst.level = dst->u.tex.level;
 457    info.dst.box.x = dstX0;
 458    info.dst.box.y = dstY0;
 459    info.dst.box.z = dst->u.tex.first_layer;
 460    info.dst.box.width = dstX1 - dstX0;
 461    info.dst.box.height = dstY1 - dstY0;
 462    assert(info.dst.box.width >= 0);
 463    assert(info.dst.box.height >= 0);
 464    info.dst.box.depth = 1;
 465    info.dst.format = dst_format;
 466    info.src.resource = src_tex;
 467    info.src.level = src_level;
 468    info.src.box.x = srcX0;
 469    info.src.box.y = srcY0;
 470    info.src.box.z = srcZ0;
 471    info.src.box.width = srcX1 - srcX0;
 472    info.src.box.height = srcY1 - srcY0;
 473    info.src.box.depth = 1;
 474    info.src.format = src_format;
 475    info.mask = writemask;
 476    info.filter = filter;
 477    info.scissor_enable = 0;
 478
 479    pipe->blit(pipe, &info);
 480 }
 481
 482
 483 /**
 484  * Copy pixel block from src sampler view to dst surface.
 485  *
 486  * The sampler view's first_level field indicates the source
 487  * mipmap level to use.
 488  *
 489  * The sampler view's first_layer indicate the layer to use, but for
 490  * cube maps it must point to the first face.  Face is passed in src_face.
 491  *
 492  * The main advantage over util_blit_pixels is that it allows to specify swizzles in
 493  * pipe_sampler_view::swizzle_?.
 494  *
 495  * But there is no control over blitting Z and/or stencil.
 496  */
 497 void
 498 util_blit_pixels_tex(struct blit_state *ctx,
 499                      struct pipe_sampler_view *src_sampler_view,
 500                      int srcX0, int srcY0,
 501                      int srcX1, int srcY1,
 502                      unsigned src_face,
 503                      struct pipe_surface *dst,
 504                      int dstX0, int dstY0,
 505                      int dstX1, int dstY1,
 506                      float z, uint filter)
 507 {
 508    boolean normalized = src_sampler_view->texture->target != PIPE_TEXTURE_RECT;
 509    struct pipe_framebuffer_state fb;
 510    float s0, t0, s1, t1;
 511    unsigned offset;
 512    struct pipe_resource *tex = src_sampler_view->texture;
 513
 514    assert(filter == PIPE_TEX_FILTER_NEAREST ||
 515           filter == PIPE_TEX_FILTER_LINEAR);
 516
 517    assert(tex);
 518    assert(tex->width0 != 0);
 519    assert(tex->height0 != 0);
 520
 521    s0 = (float) srcX0;
 522    s1 = (float) srcX1;
 523    t0 = (float) srcY0;
 524    t1 = (float) srcY1;
 525
 526    if(normalized)
 527    {
 528       /* normalize according to the mipmap level's size */
 529       int level = src_sampler_view->u.tex.first_level;
 530       float w = (float) u_minify(tex->width0, level);
 531       float h = (float) u_minify(tex->height0, level);
 532       s0 /= w;
 533       s1 /= w;
 534       t0 /= h;
 535       t1 /= h;
 536    }
 537
 538    assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
 539                                                  PIPE_TEXTURE_2D,
 540                                                  dst->texture->nr_samples,
 541                                                  PIPE_BIND_RENDER_TARGET));
 542
 543    /* save state (restored below) */
 544    cso_save_state(ctx->cso, (CSO_BIT_BLEND |
 545                              CSO_BIT_DEPTH_STENCIL_ALPHA |
 546                              CSO_BIT_RASTERIZER |
 547                              CSO_BIT_SAMPLE_MASK |
 548                              CSO_BIT_MIN_SAMPLES |
 549                              CSO_BIT_FRAGMENT_SAMPLERS |
 550                              CSO_BIT_FRAGMENT_SAMPLER_VIEWS |
 551                              CSO_BIT_STREAM_OUTPUTS |
 552                              CSO_BIT_VIEWPORT |
 553                              CSO_BIT_FRAMEBUFFER |
 554                              CSO_BIT_FRAGMENT_SHADER |
 555                              CSO_BIT_VERTEX_SHADER |
 556                              CSO_BIT_TESSCTRL_SHADER |
 557                              CSO_BIT_TESSEVAL_SHADER |
 558                              CSO_BIT_GEOMETRY_SHADER |
 559                              CSO_BIT_VERTEX_ELEMENTS |
 560                              CSO_BIT_AUX_VERTEX_BUFFER_SLOT));
 561
 562    /* set misc state we care about */
 563    cso_set_blend(ctx->cso, &ctx->blend_write_color);
 564    cso_set_depth_stencil_alpha(ctx->cso, &ctx->dsa_keep_depthstencil);
 565    cso_set_sample_mask(ctx->cso, ~0);
 566    cso_set_min_samples(ctx->cso, 1);
 567    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 568    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 569    cso_set_stream_outputs(ctx->cso, 0, NULL, NULL);
 570
 571    /* sampler */
 572    ctx->sampler.normalized_coords = normalized;
 573    ctx->sampler.min_img_filter = filter;
 574    ctx->sampler.mag_img_filter = filter;
 575    {
 576       const struct pipe_sampler_state *samplers[] = {&ctx->sampler};
 577       cso_set_samplers(ctx->cso, PIPE_SHADER_FRAGMENT, 1, samplers);
 578    }
 579
 580    /* viewport */
 581    ctx->viewport.scale[0] = 0.5f * dst->width;
 582    ctx->viewport.scale[1] = 0.5f * dst->height;
 583    ctx->viewport.scale[2] = 0.5f;
 584    ctx->viewport.translate[0] = 0.5f * dst->width;
 585    ctx->viewport.translate[1] = 0.5f * dst->height;
 586    ctx->viewport.translate[2] = 0.5f;
 587    cso_set_viewport(ctx->cso, &ctx->viewport);
 588
 589    /* texture */
 590    cso_set_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT, 1, &src_sampler_view);
 591
 592    /* shaders */
 593    set_fragment_shader(ctx, TGSI_WRITEMASK_XYZW,
 594                        src_sampler_view->format,
 595                        src_sampler_view->texture->target);
 596    set_vertex_shader(ctx);
 597    cso_set_tessctrl_shader_handle(ctx->cso, NULL);
 598    cso_set_tesseval_shader_handle(ctx->cso, NULL);
 599    cso_set_geometry_shader_handle(ctx->cso, NULL);
 600
 601    /* drawing dest */
 602    memset(&fb, 0, sizeof(fb));
 603    fb.width = dst->width;
 604    fb.height = dst->height;
 605    fb.nr_cbufs = 1;
 606    fb.cbufs[0] = dst;
 607    cso_set_framebuffer(ctx->cso, &fb);
 608
 609    /* draw quad */
 610    offset = setup_vertex_data_tex(ctx,
 611                                   src_sampler_view->texture->target,
 612                                   src_face,
 613                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 614                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 615                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 616                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 617                                   s0, t0, s1, t1,
 618                                   z);
 619
 620    util_draw_vertex_buffer(ctx->pipe, ctx->cso, ctx->vbuf,
 621                            cso_get_aux_vertex_buffer_slot(ctx->cso),
 622                            offset,
 623                            PIPE_PRIM_TRIANGLE_FAN,
 624                            4,  /* verts */
 625                            2); /* attribs/vert */
 626
 627    /* restore state we changed */
 628    cso_restore_state(ctx->cso);
 629 }