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][4];
  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_near = 1;
 102    ctx->rasterizer.depth_clip_far = 1;
 103
 104    /* samplers */
 105    ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 106    ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 107    ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 108    ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 109    ctx->sampler.min_img_filter = 0; /* set later */
 110    ctx->sampler.mag_img_filter = 0; /* set later */
 111
 112    /* vertex elements state */
 113    for (i = 0; i < 2; i++) {
 114       ctx->velem[i].src_offset = i * 4 * sizeof(float);
 115       ctx->velem[i].instance_divisor = 0;
 116       ctx->velem[i].vertex_buffer_index = 0;
 117       ctx->velem[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 118    }
 119
 120    ctx->vbuf = NULL;
 121
 122    /* init vertex data that doesn't change */
 123    for (i = 0; i < 4; i++) {
 124       ctx->vertices[i][0][3] = 1.0f; /* w */
 125       ctx->vertices[i][1][3] = 1.0f; /* q */
 126    }
 127
 128    return ctx;
 129 }
 130
 131
 132 /**
 133  * Destroy a blit context
 134  */
 135 void
 136 util_destroy_blit(struct blit_state *ctx)
 137 {
 138    struct pipe_context *pipe = ctx->pipe;
 139    unsigned i, j;
 140
 141    if (ctx->vs)
 142       pipe->delete_vs_state(pipe, ctx->vs);
 143
 144    for (i = 0; i < ARRAY_SIZE(ctx->fs); i++) {
 145       for (j = 0; j < ARRAY_SIZE(ctx->fs[i]); j++) {
 146          if (ctx->fs[i][j])
 147             pipe->delete_fs_state(pipe, ctx->fs[i][j]);
 148       }
 149    }
 150
 151    pipe_resource_reference(&ctx->vbuf, NULL);
 152
 153    FREE(ctx);
 154 }
 155
 156
 157 /**
 158  * Helper function to set the fragment shaders.
 159  */
 160 static inline void
 161 set_fragment_shader(struct blit_state *ctx,
 162                     enum pipe_format format,
 163                     boolean src_xrbias,
 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 (src_xrbias) {
 181       assert(stype == TGSI_RETURN_TYPE_FLOAT);
 182       idx = 3;
 183       if (!ctx->fs[pipe_tex][idx]) {
 184          enum tgsi_texture_type tgsi_tex =
 185             util_pipe_tex_to_tgsi_tex(pipe_tex, 0);
 186          ctx->fs[pipe_tex][idx] =
 187             util_make_fragment_tex_shader_xrbias(ctx->pipe, tgsi_tex);
 188       }
 189    }
 190    else if (!ctx->fs[pipe_tex][idx]) {
 191       enum tgsi_texture_type tgsi_tex = util_pipe_tex_to_tgsi_tex(pipe_tex, 0);
 192
 193       /* OpenGL does not allow blits from signed to unsigned integer
 194        * or vice versa. */
 195       ctx->fs[pipe_tex][idx] =
 196          util_make_fragment_tex_shader_writemask(ctx->pipe, tgsi_tex,
 197                                                  TGSI_INTERPOLATE_LINEAR,
 198                                                  TGSI_WRITEMASK_XYZW,
 199                                                  stype, stype, false, false);
 200    }
 201
 202    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[pipe_tex][idx]);
 203 }
 204
 205
 206 /**
 207  * Helper function to set the vertex shader.
 208  */
 209 static inline void
 210 set_vertex_shader(struct blit_state *ctx)
 211 {
 212    /* vertex shader - still required to provide the linkage between
 213     * fragment shader input semantics and vertex_element/buffers.
 214     */
 215    if (!ctx->vs) {
 216       const enum tgsi_semantic semantic_names[] = {
 217          TGSI_SEMANTIC_POSITION,
 218          TGSI_SEMANTIC_GENERIC
 219       };
 220       const uint semantic_indexes[] = { 0, 0 };
 221       ctx->vs = util_make_vertex_passthrough_shader(ctx->pipe, 2,
 222                                                     semantic_names,
 223                                                     semantic_indexes, FALSE);
 224    }
 225
 226    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 227 }
 228
 229
 230 /**
 231  * Get offset of next free slot in vertex buffer for quad vertices.
 232  */
 233 static unsigned
 234 get_next_slot(struct blit_state *ctx)
 235 {
 236    const unsigned max_slots = 4096 / sizeof ctx->vertices;
 237
 238    if (ctx->vbuf_slot >= max_slots) {
 239       pipe_resource_reference(&ctx->vbuf, NULL);
 240       ctx->vbuf_slot = 0;
 241    }
 242
 243    if (!ctx->vbuf) {
 244       ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
 245                                      PIPE_BIND_VERTEX_BUFFER,
 246                                      PIPE_USAGE_STREAM,
 247                                      max_slots * sizeof ctx->vertices);
 248    }
 249
 250    return ctx->vbuf_slot++ * sizeof ctx->vertices;
 251 }
 252
 253
 254
 255
 256 /**
 257  * Setup vertex data for the textured quad we'll draw.
 258  * Note: y=0=top
 259  *
 260  * FIXME: We should call util_map_texcoords2d_onto_cubemap
 261  * for cubemaps.
 262  */
 263 static unsigned
 264 setup_vertex_data_tex(struct blit_state *ctx,
 265                       enum pipe_texture_target src_target,
 266                       unsigned src_face,
 267                       float x0, float y0, float x1, float y1,
 268                       float s0, float t0, float s1, float t1,
 269                       float z)
 270 {
 271    unsigned offset;
 272
 273    ctx->vertices[0][0][0] = x0;
 274    ctx->vertices[0][0][1] = y0;
 275    ctx->vertices[0][0][2] = z;
 276    ctx->vertices[0][1][0] = s0; /*s*/
 277    ctx->vertices[0][1][1] = t0; /*t*/
 278    ctx->vertices[0][1][2] = 0;  /*r*/
 279
 280    ctx->vertices[1][0][0] = x1;
 281    ctx->vertices[1][0][1] = y0;
 282    ctx->vertices[1][0][2] = z;
 283    ctx->vertices[1][1][0] = s1; /*s*/
 284    ctx->vertices[1][1][1] = t0; /*t*/
 285    ctx->vertices[1][1][2] = 0;  /*r*/
 286
 287    ctx->vertices[2][0][0] = x1;
 288    ctx->vertices[2][0][1] = y1;
 289    ctx->vertices[2][0][2] = z;
 290    ctx->vertices[2][1][0] = s1;
 291    ctx->vertices[2][1][1] = t1;
 292    ctx->vertices[3][1][2] = 0;
 293
 294    ctx->vertices[3][0][0] = x0;
 295    ctx->vertices[3][0][1] = y1;
 296    ctx->vertices[3][0][2] = z;
 297    ctx->vertices[3][1][0] = s0;
 298    ctx->vertices[3][1][1] = t1;
 299    ctx->vertices[3][1][2] = 0;
 300
 301    if (src_target == PIPE_TEXTURE_CUBE ||
 302        src_target == PIPE_TEXTURE_CUBE_ARRAY) {
 303       /* Map cubemap texture coordinates inplace. */
 304       const unsigned stride =
 305          sizeof ctx->vertices[0] / sizeof ctx->vertices[0][0][0];
 306       util_map_texcoords2d_onto_cubemap(src_face,
 307                                         &ctx->vertices[0][1][0], stride,
 308                                         &ctx->vertices[0][1][0], stride,
 309                                         TRUE);
 310    }
 311
 312    offset = get_next_slot(ctx);
 313
 314    if (ctx->vbuf) {
 315       pipe_buffer_write_nooverlap(ctx->pipe, ctx->vbuf,
 316                                   offset, sizeof(ctx->vertices), ctx->vertices);
 317    }
 318
 319    return offset;
 320 }
 321
 322
 323 /**
 324  * \return TRUE if two regions overlap, FALSE otherwise
 325  */
 326 static boolean
 327 regions_overlap(int srcX0, int srcY0,
 328                 int srcX1, int srcY1,
 329                 int dstX0, int dstY0,
 330                 int dstX1, int dstY1)
 331 {
 332    if (MAX2(srcX0, srcX1) <= MIN2(dstX0, dstX1))
 333       return FALSE; /* src completely left of dst */
 334
 335    if (MAX2(dstX0, dstX1) <= MIN2(srcX0, srcX1))
 336       return FALSE; /* dst completely left of src */
 337
 338    if (MAX2(srcY0, srcY1) <= MIN2(dstY0, dstY1))
 339       return FALSE; /* src completely above dst */
 340
 341    if (MAX2(dstY0, dstY1) <= MIN2(srcY0, srcY1))
 342       return FALSE; /* dst completely above src */
 343
 344    return TRUE; /* some overlap */
 345 }
 346
 347
 348 /**
 349  * Can we blit from src format to dest format with a simple copy?
 350  */
 351 static boolean
 352 formats_compatible(enum pipe_format src_format,
 353                    enum pipe_format dst_format)
 354 {
 355    if (src_format == dst_format) {
 356       return TRUE;
 357    }
 358    else {
 359       const struct util_format_description *src_desc =
 360          util_format_description(src_format);
 361       const struct util_format_description *dst_desc =
 362          util_format_description(dst_format);
 363       return util_is_format_compatible(src_desc, dst_desc);
 364    }
 365 }
 366
 367
 368 /**
 369  * Copy pixel block from src surface to dst surface.
 370  * Overlapping regions are acceptable.
 371  * Flipping and stretching are supported.
 372  * \param filter  one of PIPE_TEX_FILTER_NEAREST/LINEAR
 373  * \param writemask  bitmask of PIPE_MASK_[RGBAZS].  Controls which channels
 374  *                   in the dest surface are sourced from the src surface.
 375  *                   Disabled color channels are sourced from (0,0,0,1).
 376  */
 377 void
 378 util_blit_pixels(struct blit_state *ctx,
 379                  struct pipe_resource *src_tex,
 380                  unsigned src_level,
 381                  int srcX0, int srcY0,
 382                  int srcX1, int srcY1,
 383                  int srcZ0,
 384                  struct pipe_surface *dst,
 385                  int dstX0, int dstY0,
 386                  int dstX1, int dstY1,
 387                  ASSERTED float z,
 388                  enum pipe_tex_filter filter,
 389                  uint writemask)
 390 {
 391    struct pipe_context *pipe = ctx->pipe;
 392    enum pipe_format src_format, dst_format;
 393    const int srcW = abs(srcX1 - srcX0);
 394    const int srcH = abs(srcY1 - srcY0);
 395    boolean overlap;
 396    boolean is_stencil, is_depth, blit_depth, blit_stencil;
 397    const struct util_format_description *src_desc =
 398          util_format_description(src_tex->format);
 399    struct pipe_blit_info info;
 400
 401    assert(filter == PIPE_TEX_FILTER_NEAREST ||
 402           filter == PIPE_TEX_FILTER_LINEAR);
 403
 404    assert(src_level <= src_tex->last_level);
 405
 406    /* do the regions overlap? */
 407    overlap = src_tex == dst->texture &&
 408              dst->u.tex.level == src_level &&
 409              dst->u.tex.first_layer == srcZ0 &&
 410       regions_overlap(srcX0, srcY0, srcX1, srcY1,
 411                       dstX0, dstY0, dstX1, dstY1);
 412
 413    src_format = util_format_linear(src_tex->format);
 414    dst_format = util_format_linear(dst->texture->format);
 415
 416    /* See whether we will blit depth or stencil. */
 417    is_depth = util_format_has_depth(src_desc);
 418    is_stencil = util_format_has_stencil(src_desc);
 419
 420    blit_depth = is_depth && (writemask & PIPE_MASK_Z);
 421    blit_stencil = is_stencil && (writemask & PIPE_MASK_S);
 422
 423    if (is_depth || is_stencil) {
 424       assert((writemask & PIPE_MASK_RGBA) == 0);
 425       assert(blit_depth || blit_stencil);
 426    }
 427    else {
 428       assert((writemask & PIPE_MASK_ZS) == 0);
 429       assert(!blit_depth);
 430       assert(!blit_stencil);
 431    }
 432
 433    /*
 434     * XXX: z parameter is deprecated. dst->u.tex.first_layer
 435     * specificies the destination layer.
 436     */
 437    assert(z == 0.0f);
 438
 439    /*
 440     * Check for simple case:  no format conversion, no flipping, no stretching,
 441     * no overlapping, same number of samples.
 442     * Filter mode should not matter since there's no stretching.
 443     */
 444    if (formats_compatible(src_format, dst_format) &&
 445        src_tex->nr_samples == dst->texture->nr_samples &&
 446        is_stencil == blit_stencil &&
 447        is_depth == blit_depth &&
 448        srcX0 < srcX1 &&
 449        dstX0 < dstX1 &&
 450        srcY0 < srcY1 &&
 451        dstY0 < dstY1 &&
 452        (dstX1 - dstX0) == (srcX1 - srcX0) &&
 453        (dstY1 - dstY0) == (srcY1 - srcY0) &&
 454        !overlap) {
 455       struct pipe_box src_box;
 456       src_box.x = srcX0;
 457       src_box.y = srcY0;
 458       src_box.z = srcZ0;
 459       src_box.width = srcW;
 460       src_box.height = srcH;
 461       src_box.depth = 1;
 462       pipe->resource_copy_region(pipe,
 463                                  dst->texture, dst->u.tex.level,
 464                                  dstX0, dstY0, dst->u.tex.first_layer,/* dest */
 465                                  src_tex, src_level,
 466                                  &src_box);
 467       return;
 468    }
 469
 470    memset(&info, 0, sizeof info);
 471    info.dst.resource = dst->texture;
 472    info.dst.level = dst->u.tex.level;
 473    info.dst.box.x = dstX0;
 474    info.dst.box.y = dstY0;
 475    info.dst.box.z = dst->u.tex.first_layer;
 476    info.dst.box.width = dstX1 - dstX0;
 477    info.dst.box.height = dstY1 - dstY0;
 478    assert(info.dst.box.width >= 0);
 479    assert(info.dst.box.height >= 0);
 480    info.dst.box.depth = 1;
 481    info.dst.format = dst_format;
 482    info.src.resource = src_tex;
 483    info.src.level = src_level;
 484    info.src.box.x = srcX0;
 485    info.src.box.y = srcY0;
 486    info.src.box.z = srcZ0;
 487    info.src.box.width = srcX1 - srcX0;
 488    info.src.box.height = srcY1 - srcY0;
 489    info.src.box.depth = 1;
 490    info.src.format = src_format;
 491    info.mask = writemask;
 492    info.filter = filter;
 493    info.scissor_enable = 0;
 494
 495    pipe->blit(pipe, &info);
 496 }
 497
 498
 499 /**
 500  * Copy pixel block from src sampler view to dst surface.
 501  *
 502  * The sampler view's first_level field indicates the source
 503  * mipmap level to use.
 504  *
 505  * The sampler view's first_layer indicate the layer to use, but for
 506  * cube maps it must point to the first face.  Face is passed in src_face.
 507  *
 508  * The main advantage over util_blit_pixels is that it allows to specify
 509  * swizzles in pipe_sampler_view::swizzle_?.
 510  *
 511  * But there is no control over blitting Z and/or stencil.
 512  */
 513 void
 514 util_blit_pixels_tex(struct blit_state *ctx,
 515                      struct pipe_sampler_view *src_sampler_view,
 516                      int srcX0, int srcY0,
 517                      int srcX1, int srcY1,
 518                      unsigned src_face,
 519                      struct pipe_surface *dst,
 520                      int dstX0, int dstY0,
 521                      int dstX1, int dstY1,
 522                      float z, enum pipe_tex_filter filter,
 523                      boolean src_xrbias)
 524 {
 525    boolean normalized = src_sampler_view->texture->target != PIPE_TEXTURE_RECT;
 526    struct pipe_framebuffer_state fb;
 527    float s0, t0, s1, t1;
 528    unsigned offset;
 529    struct pipe_resource *tex = src_sampler_view->texture;
 530
 531    assert(filter == PIPE_TEX_FILTER_NEAREST ||
 532           filter == PIPE_TEX_FILTER_LINEAR);
 533
 534    assert(tex);
 535    assert(tex->width0 != 0);
 536    assert(tex->height0 != 0);
 537
 538    s0 = (float) srcX0;
 539    s1 = (float) srcX1;
 540    t0 = (float) srcY0;
 541    t1 = (float) srcY1;
 542
 543    if (normalized) {
 544       /* normalize according to the mipmap level's size */
 545       int level = src_sampler_view->u.tex.first_level;
 546       float w = (float) u_minify(tex->width0, level);
 547       float h = (float) u_minify(tex->height0, level);
 548       s0 /= w;
 549       s1 /= w;
 550       t0 /= h;
 551       t1 /= h;
 552    }
 553
 554    assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
 555                                                  PIPE_TEXTURE_2D,
 556                                                  dst->texture->nr_samples,
 557                                                  dst->texture->nr_storage_samples,
 558                                                  PIPE_BIND_RENDER_TARGET));
 559
 560    /* save state (restored below) */
 561    cso_save_state(ctx->cso, (CSO_BIT_BLEND |
 562                              CSO_BIT_DEPTH_STENCIL_ALPHA |
 563                              CSO_BIT_RASTERIZER |
 564                              CSO_BIT_SAMPLE_MASK |
 565                              CSO_BIT_MIN_SAMPLES |
 566                              CSO_BIT_FRAGMENT_SAMPLERS |
 567                              CSO_BIT_FRAGMENT_SAMPLER_VIEWS |
 568                              CSO_BIT_STREAM_OUTPUTS |
 569                              CSO_BIT_VIEWPORT |
 570                              CSO_BIT_FRAMEBUFFER |
 571                              CSO_BIT_PAUSE_QUERIES |
 572                              CSO_BIT_FRAGMENT_SHADER |
 573                              CSO_BIT_VERTEX_SHADER |
 574                              CSO_BIT_TESSCTRL_SHADER |
 575                              CSO_BIT_TESSEVAL_SHADER |
 576                              CSO_BIT_GEOMETRY_SHADER |
 577                              CSO_BIT_VERTEX_ELEMENTS |
 578                              CSO_BIT_AUX_VERTEX_BUFFER_SLOT));
 579
 580    /* set misc state we care about */
 581    cso_set_blend(ctx->cso, &ctx->blend_write_color);
 582    cso_set_depth_stencil_alpha(ctx->cso, &ctx->dsa_keep_depthstencil);
 583    cso_set_sample_mask(ctx->cso, ~0);
 584    cso_set_min_samples(ctx->cso, 1);
 585    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 586    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 587    cso_set_stream_outputs(ctx->cso, 0, NULL, NULL);
 588
 589    /* sampler */
 590    ctx->sampler.normalized_coords = normalized;
 591    ctx->sampler.min_img_filter = filter;
 592    ctx->sampler.mag_img_filter = filter;
 593    {
 594       const struct pipe_sampler_state *samplers[] = {&ctx->sampler};
 595       cso_set_samplers(ctx->cso, PIPE_SHADER_FRAGMENT, 1, samplers);
 596    }
 597
 598    /* viewport */
 599    ctx->viewport.scale[0] = 0.5f * dst->width;
 600    ctx->viewport.scale[1] = 0.5f * dst->height;
 601    ctx->viewport.scale[2] = 0.5f;
 602    ctx->viewport.translate[0] = 0.5f * dst->width;
 603    ctx->viewport.translate[1] = 0.5f * dst->height;
 604    ctx->viewport.translate[2] = 0.5f;
 605    cso_set_viewport(ctx->cso, &ctx->viewport);
 606
 607    /* texture */
 608    cso_set_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT, 1, &src_sampler_view);
 609
 610    /* shaders */
 611    set_fragment_shader(ctx, src_sampler_view->format,
 612                        src_xrbias,
 613                        src_sampler_view->texture->target);
 614    set_vertex_shader(ctx);
 615    cso_set_tessctrl_shader_handle(ctx->cso, NULL);
 616    cso_set_tesseval_shader_handle(ctx->cso, NULL);
 617    cso_set_geometry_shader_handle(ctx->cso, NULL);
 618
 619    /* drawing dest */
 620    memset(&fb, 0, sizeof(fb));
 621    fb.width = dst->width;
 622    fb.height = dst->height;
 623    fb.nr_cbufs = 1;
 624    fb.cbufs[0] = dst;
 625    cso_set_framebuffer(ctx->cso, &fb);
 626
 627    /* draw quad */
 628    offset = setup_vertex_data_tex(ctx,
 629                                   src_sampler_view->texture->target,
 630                                   src_face,
 631                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 632                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 633                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 634                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 635                                   s0, t0, s1, t1,
 636                                   z);
 637
 638    util_draw_vertex_buffer(ctx->pipe, ctx->cso, ctx->vbuf, 0,
 639                            offset,
 640                            PIPE_PRIM_TRIANGLE_FAN,
 641                            4,  /* verts */
 642                            2); /* attribs/vert */
 643
 644    /* restore state we changed */
 645    cso_restore_state(ctx->cso);
 646 }