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_sampler.h"
  49 #include "util/u_simple_shaders.h"
  50 #include "util/u_surface.h"
  51 #include "util/u_rect.h"
  52
  53 #include "cso_cache/cso_context.h"
  54
  55
  56 struct blit_state
  57 {
  58    struct pipe_context *pipe;
  59    struct cso_context *cso;
  60
  61    struct pipe_blend_state blend;
  62    struct pipe_depth_stencil_alpha_state depthstencil;
  63    struct pipe_rasterizer_state rasterizer;
  64    struct pipe_sampler_state sampler;
  65    struct pipe_viewport_state viewport;
  66    struct pipe_clip_state clip;
  67    struct pipe_vertex_element velem[2];
  68
  69    void *vs;
  70    void *fs[TGSI_WRITEMASK_XYZW + 1];
  71
  72    struct pipe_resource *vbuf;  /**< quad vertices */
  73    unsigned vbuf_slot;
  74
  75    float vertices[4][2][4];   /**< vertex/texcoords for quad */
  76 };
  77
  78
  79 /**
  80  * Create state object for blit.
  81  * Intended to be created once and re-used for many blit() calls.
  82  */
  83 struct blit_state *
  84 util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
  85 {
  86    struct blit_state *ctx;
  87    uint i;
  88
  89    ctx = CALLOC_STRUCT(blit_state);
  90    if (!ctx)
  91       return NULL;
  92
  93    ctx->pipe = pipe;
  94    ctx->cso = cso;
  95
  96    /* disabled blending/masking */
  97    memset(&ctx->blend, 0, sizeof(ctx->blend));
  98    ctx->blend.rt[0].colormask = PIPE_MASK_RGBA;
  99
 100    /* no-op depth/stencil/alpha */
 101    memset(&ctx->depthstencil, 0, sizeof(ctx->depthstencil));
 102
 103    /* rasterizer */
 104    memset(&ctx->rasterizer, 0, sizeof(ctx->rasterizer));
 105    ctx->rasterizer.front_winding = PIPE_WINDING_CW;
 106    ctx->rasterizer.cull_mode = PIPE_WINDING_NONE;
 107    ctx->rasterizer.gl_rasterization_rules = 1;
 108
 109    /* samplers */
 110    memset(&ctx->sampler, 0, sizeof(ctx->sampler));
 111    ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 112    ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 113    ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 114    ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 115    ctx->sampler.min_img_filter = 0; /* set later */
 116    ctx->sampler.mag_img_filter = 0; /* set later */
 117    ctx->sampler.normalized_coords = 1;
 118
 119    /* vertex elements state */
 120    memset(&ctx->velem[0], 0, sizeof(ctx->velem[0]) * 2);
 121    for (i = 0; i < 2; i++) {
 122       ctx->velem[i].src_offset = i * 4 * sizeof(float);
 123       ctx->velem[i].instance_divisor = 0;
 124       ctx->velem[i].vertex_buffer_index = 0;
 125       ctx->velem[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 126    }
 127
 128    /* vertex shader - still required to provide the linkage between
 129     * fragment shader input semantics and vertex_element/buffers.
 130     */
 131    {
 132       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 133                                       TGSI_SEMANTIC_GENERIC };
 134       const uint semantic_indexes[] = { 0, 0 };
 135       ctx->vs = util_make_vertex_passthrough_shader(pipe, 2, semantic_names,
 136                                                     semantic_indexes);
 137    }
 138
 139    /* fragment shader */
 140    ctx->fs[TGSI_WRITEMASK_XYZW] =
 141       util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_2D);
 142    ctx->vbuf = NULL;
 143
 144    /* init vertex data that doesn't change */
 145    for (i = 0; i < 4; i++) {
 146       ctx->vertices[i][0][3] = 1.0f; /* w */
 147       ctx->vertices[i][1][2] = 0.0f; /* r */
 148       ctx->vertices[i][1][3] = 1.0f; /* q */
 149    }
 150
 151    return ctx;
 152 }
 153
 154
 155 /**
 156  * Destroy a blit context
 157  */
 158 void
 159 util_destroy_blit(struct blit_state *ctx)
 160 {
 161    struct pipe_context *pipe = ctx->pipe;
 162    unsigned i;
 163
 164    pipe->delete_vs_state(pipe, ctx->vs);
 165
 166    for (i = 0; i < Elements(ctx->fs); i++)
 167       if (ctx->fs[i])
 168          pipe->delete_fs_state(pipe, ctx->fs[i]);
 169
 170    pipe_resource_reference(&ctx->vbuf, NULL);
 171
 172    FREE(ctx);
 173 }
 174
 175
 176 /**
 177  * Get offset of next free slot in vertex buffer for quad vertices.
 178  */
 179 static unsigned
 180 get_next_slot( struct blit_state *ctx )
 181 {
 182    const unsigned max_slots = 4096 / sizeof ctx->vertices;
 183
 184    if (ctx->vbuf_slot >= max_slots)
 185       util_blit_flush( ctx );
 186
 187    if (!ctx->vbuf) {
 188       ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
 189                                      PIPE_BIND_VERTEX_BUFFER,
 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, 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                            struct pipe_sampler_view *src_sampler_view,
 284                            int srcX0, int srcY0,
 285                            int srcX1, int srcY1,
 286                            struct pipe_surface *dst,
 287                            int dstX0, int dstY0,
 288                            int dstX1, int dstY1,
 289                            float z, uint filter,
 290                            uint writemask)
 291 {
 292    struct pipe_context *pipe = ctx->pipe;
 293    struct pipe_screen *screen = pipe->screen;
 294    struct pipe_sampler_view *sampler_view = NULL;
 295    struct pipe_framebuffer_state fb;
 296    const int srcW = abs(srcX1 - srcX0);
 297    const int srcH = abs(srcY1 - srcY0);
 298    unsigned offset;
 299    boolean overlap;
 300    float s0, t0, s1, t1;
 301
 302    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 303           filter == PIPE_TEX_MIPFILTER_LINEAR);
 304
 305    assert(screen->is_format_supported(screen, src->format, PIPE_TEXTURE_2D,
 306                                       PIPE_BIND_SAMPLER_VIEW, 0));
 307    assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
 308                                       PIPE_BIND_RENDER_TARGET, 0));
 309
 310    /* do the regions overlap? */
 311    overlap = util_same_surface(src, dst) &&
 312       regions_overlap(srcX0, srcY0, srcX1, srcY1,
 313                       dstX0, dstY0, dstX1, dstY1);
 314
 315    /*
 316     * Check for simple case:  no format conversion, no flipping, no stretching,
 317     * no overlapping.
 318     * Filter mode should not matter since there's no stretching.
 319     */
 320    if (pipe->surface_copy &&
 321        dst->format == src->format &&
 322        srcX0 < srcX1 &&
 323        dstX0 < dstX1 &&
 324        srcY0 < srcY1 &&
 325        dstY0 < dstY1 &&
 326        (dstX1 - dstX0) == (srcX1 - srcX0) &&
 327        (dstY1 - dstY0) == (srcY1 - srcY0) &&
 328        !overlap) {
 329       pipe->surface_copy(pipe,
 330                          dst, dstX0, dstY0, /* dest */
 331                          src, srcX0, srcY0, /* src */
 332                          srcW, srcH);       /* size */
 333       return;
 334    }
 335
 336    assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
 337                                       PIPE_BIND_RENDER_TARGET, 0));
 338
 339    /* Create a temporary texture when src and dest alias or when src
 340     * is anything other than a single-level 2d texture.
 341     *
 342     * This can still be improved upon.
 343     */
 344    if (util_same_surface(src, dst) ||
 345        src->texture->target != PIPE_TEXTURE_2D ||
 346        src->texture->last_level != 0)
 347    {
 348       struct pipe_resource texTemp;
 349       struct pipe_resource *tex;
 350       struct pipe_sampler_view sv_templ;
 351       struct pipe_surface *texSurf;
 352       const int srcLeft = MIN2(srcX0, srcX1);
 353       const int srcTop = MIN2(srcY0, srcY1);
 354
 355       if (srcLeft != srcX0) {
 356          /* left-right flip */
 357          int tmp = dstX0;
 358          dstX0 = dstX1;
 359          dstX1 = tmp;
 360       }
 361
 362       if (srcTop != srcY0) {
 363          /* up-down flip */
 364          int tmp = dstY0;
 365          dstY0 = dstY1;
 366          dstY1 = tmp;
 367       }
 368
 369       /* create temp texture */
 370       memset(&texTemp, 0, sizeof(texTemp));
 371       texTemp.target = PIPE_TEXTURE_2D;
 372       texTemp.format = src->format;
 373       texTemp.last_level = 0;
 374       texTemp.width0 = srcW;
 375       texTemp.height0 = srcH;
 376       texTemp.depth0 = 1;
 377
 378       tex = screen->resource_create(screen, &texTemp);
 379       if (!tex)
 380          return;
 381
 382       u_sampler_view_default_template(&sv_templ, tex, tex->format);
 383
 384       sampler_view = ctx->pipe->create_sampler_view(ctx->pipe, tex, &sv_templ);
 385       if (!sampler_view) {
 386          pipe_resource_reference(&tex, NULL);
 387          return;
 388       }
 389
 390       texSurf = screen->get_tex_surface(screen, tex, 0, 0, 0,
 391                                         PIPE_BIND_BLIT_DESTINATION);
 392
 393       /* load temp texture */
 394       if (pipe->surface_copy) {
 395          pipe->surface_copy(pipe,
 396                             texSurf, 0, 0,   /* dest */
 397                             src, srcLeft, srcTop, /* src */
 398                             srcW, srcH);     /* size */
 399       } else {
 400          util_surface_copy(pipe, FALSE,
 401                            texSurf, 0, 0,   /* dest */
 402                            src, srcLeft, srcTop, /* src */
 403                            srcW, srcH);     /* size */
 404       }
 405
 406       /* free the surface, update the texture if necessary.
 407        */
 408       pipe_surface_reference(&texSurf, NULL);
 409       s0 = 0.0f;
 410       s1 = 1.0f;
 411       t0 = 0.0f;
 412       t1 = 1.0f;
 413
 414       pipe_resource_reference(&tex, NULL);
 415    }
 416    else {
 417       pipe_sampler_view_reference(&sampler_view, src_sampler_view);
 418       s0 = srcX0 / (float)src->texture->width0;
 419       s1 = srcX1 / (float)src->texture->width0;
 420       t0 = srcY0 / (float)src->texture->height0;
 421       t1 = srcY1 / (float)src->texture->height0;
 422    }
 423
 424
 425
 426    /* save state (restored below) */
 427    cso_save_blend(ctx->cso);
 428    cso_save_depth_stencil_alpha(ctx->cso);
 429    cso_save_rasterizer(ctx->cso);
 430    cso_save_samplers(ctx->cso);
 431    cso_save_fragment_sampler_views(ctx->cso);
 432    cso_save_viewport(ctx->cso);
 433    cso_save_framebuffer(ctx->cso);
 434    cso_save_fragment_shader(ctx->cso);
 435    cso_save_vertex_shader(ctx->cso);
 436    cso_save_clip(ctx->cso);
 437    cso_save_vertex_elements(ctx->cso);
 438
 439    /* set misc state we care about */
 440    cso_set_blend(ctx->cso, &ctx->blend);
 441    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
 442    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 443    cso_set_clip(ctx->cso, &ctx->clip);
 444    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 445
 446    /* sampler */
 447    ctx->sampler.min_img_filter = filter;
 448    ctx->sampler.mag_img_filter = filter;
 449    cso_single_sampler(ctx->cso, 0, &ctx->sampler);
 450    cso_single_sampler_done(ctx->cso);
 451
 452    /* viewport */
 453    ctx->viewport.scale[0] = 0.5f * dst->width;
 454    ctx->viewport.scale[1] = 0.5f * dst->height;
 455    ctx->viewport.scale[2] = 0.5f;
 456    ctx->viewport.scale[3] = 1.0f;
 457    ctx->viewport.translate[0] = 0.5f * dst->width;
 458    ctx->viewport.translate[1] = 0.5f * dst->height;
 459    ctx->viewport.translate[2] = 0.5f;
 460    ctx->viewport.translate[3] = 0.0f;
 461    cso_set_viewport(ctx->cso, &ctx->viewport);
 462
 463    /* texture */
 464    cso_set_fragment_sampler_views(ctx->cso, 1, &sampler_view);
 465
 466    if (ctx->fs[writemask] == NULL)
 467       ctx->fs[writemask] =
 468          util_make_fragment_tex_shader_writemask(pipe, TGSI_TEXTURE_2D,
 469                                                  writemask);
 470
 471    /* shaders */
 472    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[writemask]);
 473    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 474
 475    /* drawing dest */
 476    memset(&fb, 0, sizeof(fb));
 477    fb.width = dst->width;
 478    fb.height = dst->height;
 479    fb.nr_cbufs = 1;
 480    fb.cbufs[0] = dst;
 481    cso_set_framebuffer(ctx->cso, &fb);
 482
 483    /* draw quad */
 484    offset = setup_vertex_data_tex(ctx,
 485                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 486                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 487                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 488                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 489                                   s0, t0,
 490                                   s1, t1,
 491                                   z);
 492
 493    util_draw_vertex_buffer(ctx->pipe, ctx->vbuf, offset,
 494                            PIPE_PRIM_TRIANGLE_FAN,
 495                            4,  /* verts */
 496                            2); /* attribs/vert */
 497
 498    /* restore state we changed */
 499    cso_restore_blend(ctx->cso);
 500    cso_restore_depth_stencil_alpha(ctx->cso);
 501    cso_restore_rasterizer(ctx->cso);
 502    cso_restore_samplers(ctx->cso);
 503    cso_restore_fragment_sampler_views(ctx->cso);
 504    cso_restore_viewport(ctx->cso);
 505    cso_restore_framebuffer(ctx->cso);
 506    cso_restore_fragment_shader(ctx->cso);
 507    cso_restore_vertex_shader(ctx->cso);
 508    cso_restore_clip(ctx->cso);
 509    cso_restore_vertex_elements(ctx->cso);
 510
 511    pipe_sampler_view_reference(&sampler_view, NULL);
 512 }
 513
 514
 515 void
 516 util_blit_pixels(struct blit_state *ctx,
 517                  struct pipe_surface *src,
 518                  struct pipe_sampler_view *src_sampler_view,
 519                  int srcX0, int srcY0,
 520                  int srcX1, int srcY1,
 521                  struct pipe_surface *dst,
 522                  int dstX0, int dstY0,
 523                  int dstX1, int dstY1,
 524                  float z, uint filter )
 525 {
 526    util_blit_pixels_writemask( ctx, src, src_sampler_view,
 527                                srcX0, srcY0,
 528                                srcX1, srcY1,
 529                                dst,
 530                                dstX0, dstY0,
 531                                dstX1, dstY1,
 532                                z, filter,
 533                                TGSI_WRITEMASK_XYZW );
 534 }
 535
 536
 537 /* Release vertex buffer at end of frame to avoid synchronous
 538  * rendering.
 539  */
 540 void util_blit_flush( struct blit_state *ctx )
 541 {
 542    pipe_resource_reference(&ctx->vbuf, NULL);
 543    ctx->vbuf_slot = 0;
 544 }
 545
 546
 547
 548 /**
 549  * Copy pixel block from src texture to dst surface.
 550  * Overlapping regions are acceptable.
 551  *
 552  * XXX Should support selection of level.
 553  * XXX need some control over blitting Z and/or stencil.
 554  */
 555 void
 556 util_blit_pixels_tex(struct blit_state *ctx,
 557                      struct pipe_sampler_view *src_sampler_view,
 558                      int srcX0, int srcY0,
 559                      int srcX1, int srcY1,
 560                      struct pipe_surface *dst,
 561                      int dstX0, int dstY0,
 562                      int dstX1, int dstY1,
 563                      float z, uint filter)
 564 {
 565    struct pipe_framebuffer_state fb;
 566    float s0, t0, s1, t1;
 567    unsigned offset;
 568    struct pipe_resource *tex = src_sampler_view->texture;
 569
 570    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 571           filter == PIPE_TEX_MIPFILTER_LINEAR);
 572
 573    assert(tex);
 574    assert(tex->width0 != 0);
 575    assert(tex->height0 != 0);
 576
 577    s0 = srcX0 / (float)tex->width0;
 578    s1 = srcX1 / (float)tex->width0;
 579    t0 = srcY0 / (float)tex->height0;
 580    t1 = srcY1 / (float)tex->height0;
 581
 582    assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
 583                                                  PIPE_TEXTURE_2D,
 584                                                  PIPE_BIND_RENDER_TARGET,
 585                                                  0));
 586
 587    /* save state (restored below) */
 588    cso_save_blend(ctx->cso);
 589    cso_save_depth_stencil_alpha(ctx->cso);
 590    cso_save_rasterizer(ctx->cso);
 591    cso_save_samplers(ctx->cso);
 592    cso_save_fragment_sampler_views(ctx->cso);
 593    cso_save_framebuffer(ctx->cso);
 594    cso_save_fragment_shader(ctx->cso);
 595    cso_save_vertex_shader(ctx->cso);
 596    cso_save_clip(ctx->cso);
 597    cso_save_vertex_elements(ctx->cso);
 598
 599    /* set misc state we care about */
 600    cso_set_blend(ctx->cso, &ctx->blend);
 601    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
 602    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 603    cso_set_clip(ctx->cso, &ctx->clip);
 604    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 605
 606    /* sampler */
 607    ctx->sampler.min_img_filter = filter;
 608    ctx->sampler.mag_img_filter = filter;
 609    cso_single_sampler(ctx->cso, 0, &ctx->sampler);
 610    cso_single_sampler_done(ctx->cso);
 611
 612    /* viewport */
 613    ctx->viewport.scale[0] = 0.5f * dst->width;
 614    ctx->viewport.scale[1] = 0.5f * dst->height;
 615    ctx->viewport.scale[2] = 0.5f;
 616    ctx->viewport.scale[3] = 1.0f;
 617    ctx->viewport.translate[0] = 0.5f * dst->width;
 618    ctx->viewport.translate[1] = 0.5f * dst->height;
 619    ctx->viewport.translate[2] = 0.5f;
 620    ctx->viewport.translate[3] = 0.0f;
 621    cso_set_viewport(ctx->cso, &ctx->viewport);
 622
 623    /* texture */
 624    cso_set_fragment_sampler_views(ctx->cso, 1, &src_sampler_view);
 625
 626    /* shaders */
 627    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[TGSI_WRITEMASK_XYZW]);
 628    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 629
 630    /* drawing dest */
 631    memset(&fb, 0, sizeof(fb));
 632    fb.width = dst->width;
 633    fb.height = dst->height;
 634    fb.nr_cbufs = 1;
 635    fb.cbufs[0] = dst;
 636    cso_set_framebuffer(ctx->cso, &fb);
 637
 638    /* draw quad */
 639    offset = setup_vertex_data_tex(ctx,
 640                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 641                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 642                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 643                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 644                                   s0, t0, s1, t1,
 645                                   z);
 646
 647    util_draw_vertex_buffer(ctx->pipe,
 648                            ctx->vbuf, offset,
 649                            PIPE_PRIM_TRIANGLE_FAN,
 650                            4,  /* verts */
 651                            2); /* attribs/vert */
 652
 653    /* restore state we changed */
 654    cso_restore_blend(ctx->cso);
 655    cso_restore_depth_stencil_alpha(ctx->cso);
 656    cso_restore_rasterizer(ctx->cso);
 657    cso_restore_samplers(ctx->cso);
 658    cso_restore_fragment_sampler_views(ctx->cso);
 659    cso_restore_framebuffer(ctx->cso);
 660    cso_restore_fragment_shader(ctx->cso);
 661    cso_restore_vertex_shader(ctx->cso);
 662    cso_restore_clip(ctx->cso);
 663    cso_restore_vertex_elements(ctx->cso);
 664 }