src/gallium/auxiliary/util/u_blit.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   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  * @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_simple_shaders.h"
  49 #include "util/u_surface.h"
  50 #include "util/u_rect.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;
  61    struct pipe_depth_stencil_alpha_state depthstencil;
  62    struct pipe_rasterizer_state rasterizer;
  63    struct pipe_sampler_state sampler;
  64    struct pipe_viewport_state viewport;
  65    struct pipe_clip_state clip;
  66    struct pipe_vertex_element velem[2];
  67
  68    void *vs;
  69    void *fs[TGSI_WRITEMASK_XYZW + 1];
  70
  71    struct pipe_buffer *vbuf;  /**< quad vertices */
  72    unsigned vbuf_slot;
  73
  74    float vertices[4][2][4];   /**< vertex/texcoords for quad */
  75 };
  76
  77
  78 /**
  79  * Create state object for blit.
  80  * Intended to be created once and re-used for many blit() calls.
  81  */
  82 struct blit_state *
  83 util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
  84 {
  85    struct blit_state *ctx;
  86    uint i;
  87
  88    ctx = CALLOC_STRUCT(blit_state);
  89    if (!ctx)
  90       return NULL;
  91
  92    ctx->pipe = pipe;
  93    ctx->cso = cso;
  94
  95    /* disabled blending/masking */
  96    memset(&ctx->blend, 0, sizeof(ctx->blend));
  97    ctx->blend.rt[0].colormask = PIPE_MASK_RGBA;
  98
  99    /* no-op depth/stencil/alpha */
 100    memset(&ctx->depthstencil, 0, sizeof(ctx->depthstencil));
 101
 102    /* rasterizer */
 103    memset(&ctx->rasterizer, 0, sizeof(ctx->rasterizer));
 104    ctx->rasterizer.front_winding = PIPE_WINDING_CW;
 105    ctx->rasterizer.cull_mode = PIPE_WINDING_NONE;
 106    ctx->rasterizer.gl_rasterization_rules = 1;
 107
 108    /* samplers */
 109    memset(&ctx->sampler, 0, sizeof(ctx->sampler));
 110    ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 111    ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 112    ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 113    ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 114    ctx->sampler.min_img_filter = 0; /* set later */
 115    ctx->sampler.mag_img_filter = 0; /* set later */
 116    ctx->sampler.normalized_coords = 1;
 117
 118    /* vertex elements state */
 119    memset(&ctx->velem[0], 0, sizeof(ctx->velem[0]) * 2);
 120    for (i = 0; i < 2; i++) {
 121       ctx->velem[i].src_offset = i * 4 * sizeof(float);
 122       ctx->velem[i].instance_divisor = 0;
 123       ctx->velem[i].vertex_buffer_index = 0;
 124       ctx->velem[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 125    }
 126
 127    /* vertex shader - still required to provide the linkage between
 128     * fragment shader input semantics and vertex_element/buffers.
 129     */
 130    {
 131       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 132                                       TGSI_SEMANTIC_GENERIC };
 133       const uint semantic_indexes[] = { 0, 0 };
 134       ctx->vs = util_make_vertex_passthrough_shader(pipe, 2, semantic_names,
 135                                                     semantic_indexes);
 136    }
 137
 138    /* fragment shader */
 139    ctx->fs[TGSI_WRITEMASK_XYZW] =
 140       util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_2D);
 141    ctx->vbuf = NULL;
 142
 143    /* init vertex data that doesn't change */
 144    for (i = 0; i < 4; i++) {
 145       ctx->vertices[i][0][3] = 1.0f; /* w */
 146       ctx->vertices[i][1][2] = 0.0f; /* r */
 147       ctx->vertices[i][1][3] = 1.0f; /* q */
 148    }
 149
 150    return ctx;
 151 }
 152
 153
 154 /**
 155  * Destroy a blit context
 156  */
 157 void
 158 util_destroy_blit(struct blit_state *ctx)
 159 {
 160    struct pipe_context *pipe = ctx->pipe;
 161    unsigned i;
 162
 163    pipe->delete_vs_state(pipe, ctx->vs);
 164
 165    for (i = 0; i < Elements(ctx->fs); i++)
 166       if (ctx->fs[i])
 167          pipe->delete_fs_state(pipe, ctx->fs[i]);
 168
 169    pipe_buffer_reference(&ctx->vbuf, NULL);
 170
 171    FREE(ctx);
 172 }
 173
 174
 175 /**
 176  * Get offset of next free slot in vertex buffer for quad vertices.
 177  */
 178 static unsigned
 179 get_next_slot( struct blit_state *ctx )
 180 {
 181    const unsigned max_slots = 4096 / sizeof ctx->vertices;
 182
 183    if (ctx->vbuf_slot >= max_slots)
 184       util_blit_flush( ctx );
 185
 186    if (!ctx->vbuf) {
 187       ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
 188                                      32,
 189                                      PIPE_BUFFER_USAGE_VERTEX,
 190                                      max_slots * sizeof ctx->vertices);
 191    }
 192
 193    return ctx->vbuf_slot++ * sizeof ctx->vertices;
 194 }
 195
 196
 197
 198
 199
 200 /**
 201  * Setup vertex data for the textured quad we'll draw.
 202  * Note: y=0=top
 203  */
 204 static unsigned
 205 setup_vertex_data_tex(struct blit_state *ctx,
 206                       float x0, float y0, float x1, float y1,
 207                       float s0, float t0, float s1, float t1,
 208                       float z)
 209 {
 210    unsigned offset;
 211
 212    ctx->vertices[0][0][0] = x0;
 213    ctx->vertices[0][0][1] = y0;
 214    ctx->vertices[0][0][2] = z;
 215    ctx->vertices[0][1][0] = s0; /*s*/
 216    ctx->vertices[0][1][1] = t0; /*t*/
 217
 218    ctx->vertices[1][0][0] = x1;
 219    ctx->vertices[1][0][1] = y0;
 220    ctx->vertices[1][0][2] = z;
 221    ctx->vertices[1][1][0] = s1; /*s*/
 222    ctx->vertices[1][1][1] = t0; /*t*/
 223
 224    ctx->vertices[2][0][0] = x1;
 225    ctx->vertices[2][0][1] = y1;
 226    ctx->vertices[2][0][2] = z;
 227    ctx->vertices[2][1][0] = s1;
 228    ctx->vertices[2][1][1] = t1;
 229
 230    ctx->vertices[3][0][0] = x0;
 231    ctx->vertices[3][0][1] = y1;
 232    ctx->vertices[3][0][2] = z;
 233    ctx->vertices[3][1][0] = s0;
 234    ctx->vertices[3][1][1] = t1;
 235
 236    offset = get_next_slot( ctx );
 237
 238    pipe_buffer_write_nooverlap(ctx->pipe->screen, ctx->vbuf,
 239                                offset, sizeof(ctx->vertices), ctx->vertices);
 240
 241    return offset;
 242 }
 243
 244
 245 /**
 246  * \return TRUE if two regions overlap, FALSE otherwise
 247  */
 248 static boolean
 249 regions_overlap(int srcX0, int srcY0,
 250                 int srcX1, int srcY1,
 251                 int dstX0, int dstY0,
 252                 int dstX1, int dstY1)
 253 {
 254    if (MAX2(srcX0, srcX1) < MIN2(dstX0, dstX1))
 255       return FALSE; /* src completely left of dst */
 256
 257    if (MAX2(dstX0, dstX1) < MIN2(srcX0, srcX1))
 258       return FALSE; /* dst completely left of src */
 259
 260    if (MAX2(srcY0, srcY1) < MIN2(dstY0, dstY1))
 261       return FALSE; /* src completely above dst */
 262
 263    if (MAX2(dstY0, dstY1) < MIN2(srcY0, srcY1))
 264       return FALSE; /* dst completely above src */
 265
 266    return TRUE; /* some overlap */
 267 }
 268
 269
 270 /**
 271  * Copy pixel block from src surface to dst surface.
 272  * Overlapping regions are acceptable.
 273  * Flipping and stretching are supported.
 274  * \param filter  one of PIPE_TEX_MIPFILTER_NEAREST/LINEAR
 275  * \param writemask  controls which channels in the dest surface are sourced
 276  *                   from the src surface.  Disabled channels are sourced
 277  *                   from (0,0,0,1).
 278  * XXX need some control over blitting Z and/or stencil.
 279  */
 280 void
 281 util_blit_pixels_writemask(struct blit_state *ctx,
 282                            struct pipe_surface *src,
 283                            int srcX0, int srcY0,
 284                            int srcX1, int srcY1,
 285                            struct pipe_surface *dst,
 286                            int dstX0, int dstY0,
 287                            int dstX1, int dstY1,
 288                            float z, uint filter,
 289                            uint writemask)
 290 {
 291    struct pipe_context *pipe = ctx->pipe;
 292    struct pipe_screen *screen = pipe->screen;
 293    struct pipe_texture *tex = NULL;
 294    struct pipe_framebuffer_state fb;
 295    const int srcW = abs(srcX1 - srcX0);
 296    const int srcH = abs(srcY1 - srcY0);
 297    unsigned offset;
 298    boolean overlap;
 299    float s0, t0, s1, t1;
 300
 301    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 302           filter == PIPE_TEX_MIPFILTER_LINEAR);
 303
 304    assert(screen->is_format_supported(screen, src->format, PIPE_TEXTURE_2D,
 305                                       PIPE_TEXTURE_USAGE_SAMPLER, 0));
 306    assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
 307                                       PIPE_TEXTURE_USAGE_RENDER_TARGET, 0));
 308
 309    /* do the regions overlap? */
 310    overlap = util_same_surface(src, dst) &&
 311       regions_overlap(srcX0, srcY0, srcX1, srcY1,
 312                       dstX0, dstY0, dstX1, dstY1);
 313
 314    /*
 315     * Check for simple case:  no format conversion, no flipping, no stretching,
 316     * no overlapping.
 317     * Filter mode should not matter since there's no stretching.
 318     */
 319    if (pipe->surface_copy &&
 320        dst->format == src->format &&
 321        srcX0 < srcX1 &&
 322        dstX0 < dstX1 &&
 323        srcY0 < srcY1 &&
 324        dstY0 < dstY1 &&
 325        (dstX1 - dstX0) == (srcX1 - srcX0) &&
 326        (dstY1 - dstY0) == (srcY1 - srcY0) &&
 327        !overlap) {
 328       pipe->surface_copy(pipe,
 329                          dst, dstX0, dstY0, /* dest */
 330                          src, srcX0, srcY0, /* src */
 331                          srcW, srcH);       /* size */
 332       return;
 333    }
 334
 335    assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
 336                                       PIPE_TEXTURE_USAGE_RENDER_TARGET, 0));
 337
 338    /* Create a temporary texture when src and dest alias or when src
 339     * is anything other than a single-level 2d texture.
 340     *
 341     * This can still be improved upon.
 342     */
 343    if (util_same_surface(src, dst) ||
 344        src->texture->target != PIPE_TEXTURE_2D ||
 345        src->texture->last_level != 0)
 346    {
 347       struct pipe_texture texTemp;
 348       struct pipe_surface *texSurf;
 349       const int srcLeft = MIN2(srcX0, srcX1);
 350       const int srcTop = MIN2(srcY0, srcY1);
 351
 352       if (srcLeft != srcX0) {
 353          /* left-right flip */
 354          int tmp = dstX0;
 355          dstX0 = dstX1;
 356          dstX1 = tmp;
 357       }
 358
 359       if (srcTop != srcY0) {
 360          /* up-down flip */
 361          int tmp = dstY0;
 362          dstY0 = dstY1;
 363          dstY1 = tmp;
 364       }
 365
 366       /* create temp texture */
 367       memset(&texTemp, 0, sizeof(texTemp));
 368       texTemp.target = PIPE_TEXTURE_2D;
 369       texTemp.format = src->format;
 370       texTemp.last_level = 0;
 371       texTemp.width0 = srcW;
 372       texTemp.height0 = srcH;
 373       texTemp.depth0 = 1;
 374
 375       tex = screen->texture_create(screen, &texTemp);
 376       if (!tex)
 377          return;
 378
 379       texSurf = screen->get_tex_surface(screen, tex, 0, 0, 0,
 380                                         PIPE_BUFFER_USAGE_GPU_WRITE);
 381
 382       /* load temp texture */
 383       if (pipe->surface_copy) {
 384          pipe->surface_copy(pipe,
 385                             texSurf, 0, 0,   /* dest */
 386                             src, srcLeft, srcTop, /* src */
 387                             srcW, srcH);     /* size */
 388       } else {
 389          util_surface_copy(pipe, FALSE,
 390                            texSurf, 0, 0,   /* dest */
 391                            src, srcLeft, srcTop, /* src */
 392                            srcW, srcH);     /* size */
 393       }
 394
 395       /* free the surface, update the texture if necessary.
 396        */
 397       pipe_surface_reference(&texSurf, NULL);
 398       s0 = 0.0f;
 399       s1 = 1.0f;
 400       t0 = 0.0f;
 401       t1 = 1.0f;
 402    }
 403    else {
 404       pipe_texture_reference(&tex, src->texture);
 405       s0 = srcX0 / (float)tex->width0;
 406       s1 = srcX1 / (float)tex->width0;
 407       t0 = srcY0 / (float)tex->height0;
 408       t1 = srcY1 / (float)tex->height0;
 409    }
 410
 411
 412    /* save state (restored below) */
 413    cso_save_blend(ctx->cso);
 414    cso_save_depth_stencil_alpha(ctx->cso);
 415    cso_save_rasterizer(ctx->cso);
 416    cso_save_samplers(ctx->cso);
 417    cso_save_sampler_textures(ctx->cso);
 418    cso_save_viewport(ctx->cso);
 419    cso_save_framebuffer(ctx->cso);
 420    cso_save_fragment_shader(ctx->cso);
 421    cso_save_vertex_shader(ctx->cso);
 422    cso_save_clip(ctx->cso);
 423    cso_save_vertex_elements(ctx->cso);
 424
 425    /* set misc state we care about */
 426    cso_set_blend(ctx->cso, &ctx->blend);
 427    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
 428    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 429    cso_set_clip(ctx->cso, &ctx->clip);
 430    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 431
 432    /* sampler */
 433    ctx->sampler.min_img_filter = filter;
 434    ctx->sampler.mag_img_filter = filter;
 435    cso_single_sampler(ctx->cso, 0, &ctx->sampler);
 436    cso_single_sampler_done(ctx->cso);
 437
 438    /* viewport */
 439    ctx->viewport.scale[0] = 0.5f * dst->width;
 440    ctx->viewport.scale[1] = 0.5f * dst->height;
 441    ctx->viewport.scale[2] = 0.5f;
 442    ctx->viewport.scale[3] = 1.0f;
 443    ctx->viewport.translate[0] = 0.5f * dst->width;
 444    ctx->viewport.translate[1] = 0.5f * dst->height;
 445    ctx->viewport.translate[2] = 0.5f;
 446    ctx->viewport.translate[3] = 0.0f;
 447    cso_set_viewport(ctx->cso, &ctx->viewport);
 448
 449    /* texture */
 450    cso_set_sampler_textures(ctx->cso, 1, &tex);
 451
 452    if (ctx->fs[writemask] == NULL)
 453       ctx->fs[writemask] =
 454          util_make_fragment_tex_shader_writemask(pipe, TGSI_TEXTURE_2D,
 455                                                  writemask);
 456
 457    /* shaders */
 458    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[writemask]);
 459    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 460
 461    /* drawing dest */
 462    memset(&fb, 0, sizeof(fb));
 463    fb.width = dst->width;
 464    fb.height = dst->height;
 465    fb.nr_cbufs = 1;
 466    fb.cbufs[0] = dst;
 467    cso_set_framebuffer(ctx->cso, &fb);
 468
 469    /* draw quad */
 470    offset = setup_vertex_data_tex(ctx,
 471                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 472                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 473                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 474                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 475                                   s0, t0,
 476                                   s1, t1,
 477                                   z);
 478
 479    util_draw_vertex_buffer(ctx->pipe, ctx->vbuf, offset,
 480                            PIPE_PRIM_TRIANGLE_FAN,
 481                            4,  /* verts */
 482                            2); /* attribs/vert */
 483
 484    /* restore state we changed */
 485    cso_restore_blend(ctx->cso);
 486    cso_restore_depth_stencil_alpha(ctx->cso);
 487    cso_restore_rasterizer(ctx->cso);
 488    cso_restore_samplers(ctx->cso);
 489    cso_restore_sampler_textures(ctx->cso);
 490    cso_restore_viewport(ctx->cso);
 491    cso_restore_framebuffer(ctx->cso);
 492    cso_restore_fragment_shader(ctx->cso);
 493    cso_restore_vertex_shader(ctx->cso);
 494    cso_restore_clip(ctx->cso);
 495    cso_restore_vertex_elements(ctx->cso);
 496
 497    pipe_texture_reference(&tex, NULL);
 498 }
 499
 500
 501 void
 502 util_blit_pixels(struct blit_state *ctx,
 503                  struct pipe_surface *src,
 504                  int srcX0, int srcY0,
 505                  int srcX1, int srcY1,
 506                  struct pipe_surface *dst,
 507                  int dstX0, int dstY0,
 508                  int dstX1, int dstY1,
 509                  float z, uint filter )
 510 {
 511    util_blit_pixels_writemask( ctx, src,
 512                                srcX0, srcY0,
 513                                srcX1, srcY1,
 514                                dst,
 515                                dstX0, dstY0,
 516                                dstX1, dstY1,
 517                                z, filter,
 518                                TGSI_WRITEMASK_XYZW );
 519 }
 520
 521
 522 /* Release vertex buffer at end of frame to avoid synchronous
 523  * rendering.
 524  */
 525 void util_blit_flush( struct blit_state *ctx )
 526 {
 527    pipe_buffer_reference(&ctx->vbuf, NULL);
 528    ctx->vbuf_slot = 0;
 529 }
 530
 531
 532
 533 /**
 534  * Copy pixel block from src texture to dst surface.
 535  * Overlapping regions are acceptable.
 536  *
 537  * XXX Should support selection of level.
 538  * XXX need some control over blitting Z and/or stencil.
 539  */
 540 void
 541 util_blit_pixels_tex(struct blit_state *ctx,
 542                  struct pipe_texture *tex,
 543                  int srcX0, int srcY0,
 544                  int srcX1, int srcY1,
 545                  struct pipe_surface *dst,
 546                  int dstX0, int dstY0,
 547                  int dstX1, int dstY1,
 548                  float z, uint filter)
 549 {
 550    struct pipe_framebuffer_state fb;
 551    float s0, t0, s1, t1;
 552    unsigned offset;
 553
 554    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 555           filter == PIPE_TEX_MIPFILTER_LINEAR);
 556
 557    assert(tex->width0 != 0);
 558    assert(tex->height0 != 0);
 559
 560    s0 = srcX0 / (float)tex->width0;
 561    s1 = srcX1 / (float)tex->width0;
 562    t0 = srcY0 / (float)tex->height0;
 563    t1 = srcY1 / (float)tex->height0;
 564
 565    assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
 566                                                  PIPE_TEXTURE_2D,
 567                                                  PIPE_TEXTURE_USAGE_RENDER_TARGET,
 568                                                  0));
 569
 570    /* save state (restored below) */
 571    cso_save_blend(ctx->cso);
 572    cso_save_depth_stencil_alpha(ctx->cso);
 573    cso_save_rasterizer(ctx->cso);
 574    cso_save_samplers(ctx->cso);
 575    cso_save_sampler_textures(ctx->cso);
 576    cso_save_framebuffer(ctx->cso);
 577    cso_save_fragment_shader(ctx->cso);
 578    cso_save_vertex_shader(ctx->cso);
 579    cso_save_clip(ctx->cso);
 580    cso_save_vertex_elements(ctx->cso);
 581
 582    /* set misc state we care about */
 583    cso_set_blend(ctx->cso, &ctx->blend);
 584    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
 585    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 586    cso_set_clip(ctx->cso, &ctx->clip);
 587    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 588
 589    /* sampler */
 590    ctx->sampler.min_img_filter = filter;
 591    ctx->sampler.mag_img_filter = filter;
 592    cso_single_sampler(ctx->cso, 0, &ctx->sampler);
 593    cso_single_sampler_done(ctx->cso);
 594
 595    /* viewport */
 596    ctx->viewport.scale[0] = 0.5f * dst->width;
 597    ctx->viewport.scale[1] = 0.5f * dst->height;
 598    ctx->viewport.scale[2] = 0.5f;
 599    ctx->viewport.scale[3] = 1.0f;
 600    ctx->viewport.translate[0] = 0.5f * dst->width;
 601    ctx->viewport.translate[1] = 0.5f * dst->height;
 602    ctx->viewport.translate[2] = 0.5f;
 603    ctx->viewport.translate[3] = 0.0f;
 604    cso_set_viewport(ctx->cso, &ctx->viewport);
 605
 606    /* texture */
 607    cso_set_sampler_textures(ctx->cso, 1, &tex);
 608
 609    /* shaders */
 610    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[TGSI_WRITEMASK_XYZW]);
 611    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 612
 613    /* drawing dest */
 614    memset(&fb, 0, sizeof(fb));
 615    fb.width = dst->width;
 616    fb.height = dst->height;
 617    fb.nr_cbufs = 1;
 618    fb.cbufs[0] = dst;
 619    cso_set_framebuffer(ctx->cso, &fb);
 620
 621    /* draw quad */
 622    offset = setup_vertex_data_tex(ctx,
 623                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 624                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 625                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 626                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 627                                   s0, t0, s1, t1,
 628                                   z);
 629
 630    util_draw_vertex_buffer(ctx->pipe,
 631                            ctx->vbuf, offset,
 632                            PIPE_PRIM_TRIANGLE_FAN,
 633                            4,  /* verts */
 634                            2); /* attribs/vert */
 635
 636    /* restore state we changed */
 637    cso_restore_blend(ctx->cso);
 638    cso_restore_depth_stencil_alpha(ctx->cso);
 639    cso_restore_rasterizer(ctx->cso);
 640    cso_restore_samplers(ctx->cso);
 641    cso_restore_sampler_textures(ctx->cso);
 642    cso_restore_framebuffer(ctx->cso);
 643    cso_restore_fragment_shader(ctx->cso);
 644    cso_restore_vertex_shader(ctx->cso);
 645    cso_restore_clip(ctx->cso);
 646    cso_restore_vertex_elements(ctx->cso);
 647 }