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_math.h"
  46 #include "util/u_memory.h"
  47 #include "util/u_sampler.h"
  48 #include "util/u_simple_shaders.h"
  49
  50 #include "cso_cache/cso_context.h"
  51
  52
  53 struct blit_state
  54 {
  55    struct pipe_context *pipe;
  56    struct cso_context *cso;
  57
  58    struct pipe_blend_state blend;
  59    struct pipe_depth_stencil_alpha_state depthstencil;
  60    struct pipe_rasterizer_state rasterizer;
  61    struct pipe_sampler_state sampler;
  62    struct pipe_viewport_state viewport;
  63    struct pipe_clip_state clip;
  64    struct pipe_vertex_element velem[2];
  65
  66    void *vs;
  67    void *fs[TGSI_WRITEMASK_XYZW + 1];
  68
  69    struct pipe_resource *vbuf;  /**< quad vertices */
  70    unsigned vbuf_slot;
  71
  72    float vertices[4][2][4];   /**< vertex/texcoords for quad */
  73 };
  74
  75
  76 /**
  77  * Create state object for blit.
  78  * Intended to be created once and re-used for many blit() calls.
  79  */
  80 struct blit_state *
  81 util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
  82 {
  83    struct blit_state *ctx;
  84    uint i;
  85
  86    ctx = CALLOC_STRUCT(blit_state);
  87    if (!ctx)
  88       return NULL;
  89
  90    ctx->pipe = pipe;
  91    ctx->cso = cso;
  92
  93    /* disabled blending/masking */
  94    memset(&ctx->blend, 0, sizeof(ctx->blend));
  95    ctx->blend.rt[0].colormask = PIPE_MASK_RGBA;
  96
  97    /* no-op depth/stencil/alpha */
  98    memset(&ctx->depthstencil, 0, sizeof(ctx->depthstencil));
  99
 100    /* rasterizer */
 101    memset(&ctx->rasterizer, 0, sizeof(ctx->rasterizer));
 102    ctx->rasterizer.cull_face = PIPE_FACE_NONE;
 103    ctx->rasterizer.gl_rasterization_rules = 1;
 104
 105    /* samplers */
 106    memset(&ctx->sampler, 0, sizeof(ctx->sampler));
 107    ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 108    ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 109    ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 110    ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 111    ctx->sampler.min_img_filter = 0; /* set later */
 112    ctx->sampler.mag_img_filter = 0; /* set later */
 113    ctx->sampler.normalized_coords = 1;
 114
 115    /* vertex elements state */
 116    memset(&ctx->velem[0], 0, sizeof(ctx->velem[0]) * 2);
 117    for (i = 0; i < 2; i++) {
 118       ctx->velem[i].src_offset = i * 4 * sizeof(float);
 119       ctx->velem[i].instance_divisor = 0;
 120       ctx->velem[i].vertex_buffer_index = 0;
 121       ctx->velem[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 122    }
 123
 124    /* vertex shader - still required to provide the linkage between
 125     * fragment shader input semantics and vertex_element/buffers.
 126     */
 127    {
 128       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 129                                       TGSI_SEMANTIC_GENERIC };
 130       const uint semantic_indexes[] = { 0, 0 };
 131       ctx->vs = util_make_vertex_passthrough_shader(pipe, 2, semantic_names,
 132                                                     semantic_indexes);
 133    }
 134
 135    /* fragment shader */
 136    ctx->fs[TGSI_WRITEMASK_XYZW] =
 137       util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_2D,
 138                                     TGSI_INTERPOLATE_LINEAR);
 139    ctx->vbuf = NULL;
 140
 141    /* init vertex data that doesn't change */
 142    for (i = 0; i < 4; i++) {
 143       ctx->vertices[i][0][3] = 1.0f; /* w */
 144       ctx->vertices[i][1][2] = 0.0f; /* r */
 145       ctx->vertices[i][1][3] = 1.0f; /* q */
 146    }
 147
 148    return ctx;
 149 }
 150
 151
 152 /**
 153  * Destroy a blit context
 154  */
 155 void
 156 util_destroy_blit(struct blit_state *ctx)
 157 {
 158    struct pipe_context *pipe = ctx->pipe;
 159    unsigned i;
 160
 161    pipe->delete_vs_state(pipe, ctx->vs);
 162
 163    for (i = 0; i < Elements(ctx->fs); i++)
 164       if (ctx->fs[i])
 165          pipe->delete_fs_state(pipe, ctx->fs[i]);
 166
 167    pipe_resource_reference(&ctx->vbuf, NULL);
 168
 169    FREE(ctx);
 170 }
 171
 172
 173 /**
 174  * Get offset of next free slot in vertex buffer for quad vertices.
 175  */
 176 static unsigned
 177 get_next_slot( struct blit_state *ctx )
 178 {
 179    const unsigned max_slots = 4096 / sizeof ctx->vertices;
 180
 181    if (ctx->vbuf_slot >= max_slots)
 182       util_blit_flush( ctx );
 183
 184    if (!ctx->vbuf) {
 185       ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
 186                                      PIPE_BIND_VERTEX_BUFFER,
 187                                      max_slots * sizeof ctx->vertices);
 188    }
 189
 190    return ctx->vbuf_slot++ * sizeof ctx->vertices;
 191 }
 192
 193
 194
 195
 196 /**
 197  * Setup vertex data for the textured quad we'll draw.
 198  * Note: y=0=top
 199  */
 200 static unsigned
 201 setup_vertex_data_tex(struct blit_state *ctx,
 202                       float x0, float y0, float x1, float y1,
 203                       float s0, float t0, float s1, float t1,
 204                       float z)
 205 {
 206    unsigned offset;
 207
 208    ctx->vertices[0][0][0] = x0;
 209    ctx->vertices[0][0][1] = y0;
 210    ctx->vertices[0][0][2] = z;
 211    ctx->vertices[0][1][0] = s0; /*s*/
 212    ctx->vertices[0][1][1] = t0; /*t*/
 213
 214    ctx->vertices[1][0][0] = x1;
 215    ctx->vertices[1][0][1] = y0;
 216    ctx->vertices[1][0][2] = z;
 217    ctx->vertices[1][1][0] = s1; /*s*/
 218    ctx->vertices[1][1][1] = t0; /*t*/
 219
 220    ctx->vertices[2][0][0] = x1;
 221    ctx->vertices[2][0][1] = y1;
 222    ctx->vertices[2][0][2] = z;
 223    ctx->vertices[2][1][0] = s1;
 224    ctx->vertices[2][1][1] = t1;
 225
 226    ctx->vertices[3][0][0] = x0;
 227    ctx->vertices[3][0][1] = y1;
 228    ctx->vertices[3][0][2] = z;
 229    ctx->vertices[3][1][0] = s0;
 230    ctx->vertices[3][1][1] = t1;
 231
 232    offset = get_next_slot( ctx );
 233
 234    pipe_buffer_write_nooverlap(ctx->pipe, ctx->vbuf,
 235                                offset, sizeof(ctx->vertices), ctx->vertices);
 236
 237    return offset;
 238 }
 239
 240
 241 /**
 242  * \return TRUE if two regions overlap, FALSE otherwise
 243  */
 244 static boolean
 245 regions_overlap(int srcX0, int srcY0,
 246                 int srcX1, int srcY1,
 247                 int dstX0, int dstY0,
 248                 int dstX1, int dstY1)
 249 {
 250    if (MAX2(srcX0, srcX1) < MIN2(dstX0, dstX1))
 251       return FALSE; /* src completely left of dst */
 252
 253    if (MAX2(dstX0, dstX1) < MIN2(srcX0, srcX1))
 254       return FALSE; /* dst completely left of src */
 255
 256    if (MAX2(srcY0, srcY1) < MIN2(dstY0, dstY1))
 257       return FALSE; /* src completely above dst */
 258
 259    if (MAX2(dstY0, dstY1) < MIN2(srcY0, srcY1))
 260       return FALSE; /* dst completely above src */
 261
 262    return TRUE; /* some overlap */
 263 }
 264
 265
 266 /**
 267  * Copy pixel block from src surface to dst surface.
 268  * Overlapping regions are acceptable.
 269  * Flipping and stretching are supported.
 270  * \param filter  one of PIPE_TEX_MIPFILTER_NEAREST/LINEAR
 271  * \param writemask  controls which channels in the dest surface are sourced
 272  *                   from the src surface.  Disabled channels are sourced
 273  *                   from (0,0,0,1).
 274  * XXX need some control over blitting Z and/or stencil.
 275  */
 276 void
 277 util_blit_pixels_writemask(struct blit_state *ctx,
 278                            struct pipe_resource *src_tex,
 279                            struct pipe_subresource srcsub,
 280                            int srcX0, int srcY0,
 281                            int srcX1, int srcY1,
 282                            int srcZ0,
 283                            struct pipe_surface *dst,
 284                            int dstX0, int dstY0,
 285                            int dstX1, int dstY1,
 286                            float z, uint filter,
 287                            uint writemask)
 288 {
 289    struct pipe_context *pipe = ctx->pipe;
 290    struct pipe_screen *screen = pipe->screen;
 291    struct pipe_sampler_view *sampler_view = NULL;
 292    struct pipe_sampler_view sv_templ;
 293    struct pipe_framebuffer_state fb;
 294    const int srcW = abs(srcX1 - srcX0);
 295    const int srcH = abs(srcY1 - srcY0);
 296    unsigned offset;
 297    boolean overlap;
 298    float s0, t0, s1, t1;
 299
 300    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 301           filter == PIPE_TEX_MIPFILTER_LINEAR);
 302
 303    assert(srcsub.level <= src_tex->last_level);
 304
 305    /* do the regions overlap? */
 306    overlap = src_tex == dst->texture &&
 307              dst->face == srcsub.face &&
 308              dst->level == srcsub.level &&
 309              dst->zslice == srcZ0 &&
 310       regions_overlap(srcX0, srcY0, srcX1, srcY1,
 311                       dstX0, dstY0, dstX1, dstY1);
 312
 313    /*
 314     * Check for simple case:  no format conversion, no flipping, no stretching,
 315     * no overlapping.
 316     * Filter mode should not matter since there's no stretching.
 317     */
 318    if (dst->format == src_tex->format &&
 319        srcX0 < srcX1 &&
 320        dstX0 < dstX1 &&
 321        srcY0 < srcY1 &&
 322        dstY0 < dstY1 &&
 323        (dstX1 - dstX0) == (srcX1 - srcX0) &&
 324        (dstY1 - dstY0) == (srcY1 - srcY0) &&
 325        !overlap) {
 326       struct pipe_subresource subdst;
 327       subdst.face = dst->face;
 328       subdst.level = dst->level;
 329       pipe->resource_copy_region(pipe,
 330                                  dst->texture, subdst,
 331                                  dstX0, dstY0, dst->zslice,/* dest */
 332                                  src_tex, srcsub,
 333                                  srcX0, srcY0, srcZ0,/* src */
 334                                  srcW, srcH);       /* size */
 335       return;
 336    }
 337
 338
 339    /* Create a temporary texture when src and dest alias or when src
 340     * is anything other than a 2d texture.
 341     * XXX should just use appropriate shader to access 1d / 3d slice / cube face,
 342     * much like the u_blitter code does (should be pretty trivial).
 343     *
 344     * This can still be improved upon.
 345     */
 346    if ((src_tex == dst->texture &&
 347        dst->face == srcsub.face &&
 348        dst->level == srcsub.level &&
 349        dst->zslice == srcZ0) ||
 350        src_tex->target != PIPE_TEXTURE_2D)
 351    {
 352       struct pipe_resource texTemp;
 353       struct pipe_resource *tex;
 354       struct pipe_sampler_view sv_templ;
 355       struct pipe_subresource texsub;
 356       const int srcLeft = MIN2(srcX0, srcX1);
 357       const int srcTop = MIN2(srcY0, srcY1);
 358
 359       if (srcLeft != srcX0) {
 360          /* left-right flip */
 361          int tmp = dstX0;
 362          dstX0 = dstX1;
 363          dstX1 = tmp;
 364       }
 365
 366       if (srcTop != srcY0) {
 367          /* up-down flip */
 368          int tmp = dstY0;
 369          dstY0 = dstY1;
 370          dstY1 = tmp;
 371       }
 372
 373       /* create temp texture */
 374       memset(&texTemp, 0, sizeof(texTemp));
 375       texTemp.target = PIPE_TEXTURE_2D;
 376       texTemp.format = src_tex->format;
 377       texTemp.last_level = 0;
 378       texTemp.width0 = srcW;
 379       texTemp.height0 = srcH;
 380       texTemp.depth0 = 1;
 381       texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 382
 383       tex = screen->resource_create(screen, &texTemp);
 384       if (!tex)
 385          return;
 386
 387       texsub.face = 0;
 388       texsub.level = 0;
 389       /* load temp texture */
 390       pipe->resource_copy_region(pipe,
 391                                  tex, texsub, 0, 0, 0,  /* dest */
 392                                  src_tex, srcsub, srcLeft, srcTop, srcZ0, /* src */
 393                                  srcW, srcH);     /* size */
 394
 395       s0 = 0.0f;
 396       s1 = 1.0f;
 397       t0 = 0.0f;
 398       t1 = 1.0f;
 399
 400       u_sampler_view_default_template(&sv_templ, tex, tex->format);
 401       sampler_view = pipe->create_sampler_view(pipe, tex, &sv_templ);
 402
 403       if (!sampler_view) {
 404          pipe_resource_reference(&tex, NULL);
 405          return;
 406       }
 407       pipe_resource_reference(&tex, NULL);
 408    }
 409    else {
 410       u_sampler_view_default_template(&sv_templ, src_tex, src_tex->format);
 411       sv_templ.first_level = sv_templ.last_level = srcsub.level;
 412       sampler_view = pipe->create_sampler_view(pipe, src_tex, &sv_templ);
 413
 414       if (!sampler_view) {
 415          return;
 416       }
 417
 418       s0 = srcX0 / (float)(u_minify(sampler_view->texture->width0, srcsub.level));
 419       s1 = srcX1 / (float)(u_minify(sampler_view->texture->width0, srcsub.level));
 420       t0 = srcY0 / (float)(u_minify(sampler_view->texture->height0, srcsub.level));
 421       t1 = srcY1 / (float)(u_minify(sampler_view->texture->height0, srcsub.level));
 422    }
 423
 424
 425    assert(screen->is_format_supported(screen, sampler_view->format, PIPE_TEXTURE_2D,
 426                                       sampler_view->texture->nr_samples,
 427                                       PIPE_BIND_SAMPLER_VIEW, 0));
 428    assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
 429                                       dst->texture->nr_samples,
 430                                       PIPE_BIND_RENDER_TARGET, 0));
 431
 432    /* save state (restored below) */
 433    cso_save_blend(ctx->cso);
 434    cso_save_depth_stencil_alpha(ctx->cso);
 435    cso_save_rasterizer(ctx->cso);
 436    cso_save_samplers(ctx->cso);
 437    cso_save_fragment_sampler_views(ctx->cso);
 438    cso_save_viewport(ctx->cso);
 439    cso_save_framebuffer(ctx->cso);
 440    cso_save_fragment_shader(ctx->cso);
 441    cso_save_vertex_shader(ctx->cso);
 442    cso_save_clip(ctx->cso);
 443    cso_save_vertex_elements(ctx->cso);
 444
 445    /* set misc state we care about */
 446    cso_set_blend(ctx->cso, &ctx->blend);
 447    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
 448    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 449    cso_set_clip(ctx->cso, &ctx->clip);
 450    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 451
 452    /* sampler */
 453    ctx->sampler.min_img_filter = filter;
 454    ctx->sampler.mag_img_filter = filter;
 455    /* we've limited this already with the sampler view but you never know... */
 456    ctx->sampler.min_lod = srcsub.level;
 457    ctx->sampler.max_lod = srcsub.level;
 458    cso_single_sampler(ctx->cso, 0, &ctx->sampler);
 459    cso_single_sampler_done(ctx->cso);
 460
 461    /* viewport */
 462    ctx->viewport.scale[0] = 0.5f * dst->width;
 463    ctx->viewport.scale[1] = 0.5f * dst->height;
 464    ctx->viewport.scale[2] = 0.5f;
 465    ctx->viewport.scale[3] = 1.0f;
 466    ctx->viewport.translate[0] = 0.5f * dst->width;
 467    ctx->viewport.translate[1] = 0.5f * dst->height;
 468    ctx->viewport.translate[2] = 0.5f;
 469    ctx->viewport.translate[3] = 0.0f;
 470    cso_set_viewport(ctx->cso, &ctx->viewport);
 471
 472    /* texture */
 473    cso_set_fragment_sampler_views(ctx->cso, 1, &sampler_view);
 474
 475    if (ctx->fs[writemask] == NULL)
 476       ctx->fs[writemask] =
 477          util_make_fragment_tex_shader_writemask(pipe, TGSI_TEXTURE_2D,
 478                                                  TGSI_INTERPOLATE_LINEAR,
 479                                                  writemask);
 480
 481    /* shaders */
 482    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[writemask]);
 483    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 484
 485    /* drawing dest */
 486    memset(&fb, 0, sizeof(fb));
 487    fb.width = dst->width;
 488    fb.height = dst->height;
 489    fb.nr_cbufs = 1;
 490    fb.cbufs[0] = dst;
 491    cso_set_framebuffer(ctx->cso, &fb);
 492
 493    /* draw quad */
 494    offset = setup_vertex_data_tex(ctx,
 495                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 496                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 497                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 498                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 499                                   s0, t0,
 500                                   s1, t1,
 501                                   z);
 502
 503    util_draw_vertex_buffer(ctx->pipe, ctx->vbuf, offset,
 504                            PIPE_PRIM_TRIANGLE_FAN,
 505                            4,  /* verts */
 506                            2); /* attribs/vert */
 507
 508    /* restore state we changed */
 509    cso_restore_blend(ctx->cso);
 510    cso_restore_depth_stencil_alpha(ctx->cso);
 511    cso_restore_rasterizer(ctx->cso);
 512    cso_restore_samplers(ctx->cso);
 513    cso_restore_fragment_sampler_views(ctx->cso);
 514    cso_restore_viewport(ctx->cso);
 515    cso_restore_framebuffer(ctx->cso);
 516    cso_restore_fragment_shader(ctx->cso);
 517    cso_restore_vertex_shader(ctx->cso);
 518    cso_restore_clip(ctx->cso);
 519    cso_restore_vertex_elements(ctx->cso);
 520
 521    pipe_sampler_view_reference(&sampler_view, NULL);
 522 }
 523
 524
 525 void
 526 util_blit_pixels(struct blit_state *ctx,
 527                  struct pipe_resource *src_tex,
 528                  struct pipe_subresource srcsub,
 529                  int srcX0, int srcY0,
 530                  int srcX1, int srcY1,
 531                  int srcZ,
 532                  struct pipe_surface *dst,
 533                  int dstX0, int dstY0,
 534                  int dstX1, int dstY1,
 535                  float z, uint filter )
 536 {
 537    util_blit_pixels_writemask( ctx, src_tex,
 538                                srcsub,
 539                                srcX0, srcY0,
 540                                srcX1, srcY1,
 541                                srcZ,
 542                                dst,
 543                                dstX0, dstY0,
 544                                dstX1, dstY1,
 545                                z, filter,
 546                                TGSI_WRITEMASK_XYZW );
 547 }
 548
 549
 550 /* Release vertex buffer at end of frame to avoid synchronous
 551  * rendering.
 552  */
 553 void util_blit_flush( struct blit_state *ctx )
 554 {
 555    pipe_resource_reference(&ctx->vbuf, NULL);
 556    ctx->vbuf_slot = 0;
 557 }
 558
 559
 560
 561 /**
 562  * Copy pixel block from src texture to dst surface.
 563  *
 564  * XXX Should support selection of level.
 565  * XXX need some control over blitting Z and/or stencil.
 566  */
 567 void
 568 util_blit_pixels_tex(struct blit_state *ctx,
 569                      struct pipe_sampler_view *src_sampler_view,
 570                      int srcX0, int srcY0,
 571                      int srcX1, int srcY1,
 572                      struct pipe_surface *dst,
 573                      int dstX0, int dstY0,
 574                      int dstX1, int dstY1,
 575                      float z, uint filter)
 576 {
 577    struct pipe_framebuffer_state fb;
 578    float s0, t0, s1, t1;
 579    unsigned offset;
 580    struct pipe_resource *tex = src_sampler_view->texture;
 581
 582    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 583           filter == PIPE_TEX_MIPFILTER_LINEAR);
 584
 585    assert(tex);
 586    assert(tex->width0 != 0);
 587    assert(tex->height0 != 0);
 588
 589    s0 = srcX0 / (float)tex->width0;
 590    s1 = srcX1 / (float)tex->width0;
 591    t0 = srcY0 / (float)tex->height0;
 592    t1 = srcY1 / (float)tex->height0;
 593
 594    assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
 595                                                  PIPE_TEXTURE_2D,
 596                                                  dst->texture->nr_samples,
 597                                                  PIPE_BIND_RENDER_TARGET,
 598                                                  0));
 599
 600    /* save state (restored below) */
 601    cso_save_blend(ctx->cso);
 602    cso_save_depth_stencil_alpha(ctx->cso);
 603    cso_save_rasterizer(ctx->cso);
 604    cso_save_samplers(ctx->cso);
 605    cso_save_fragment_sampler_views(ctx->cso);
 606    cso_save_framebuffer(ctx->cso);
 607    cso_save_fragment_shader(ctx->cso);
 608    cso_save_vertex_shader(ctx->cso);
 609    cso_save_clip(ctx->cso);
 610    cso_save_vertex_elements(ctx->cso);
 611
 612    /* set misc state we care about */
 613    cso_set_blend(ctx->cso, &ctx->blend);
 614    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
 615    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 616    cso_set_clip(ctx->cso, &ctx->clip);
 617    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 618
 619    /* sampler */
 620    ctx->sampler.min_img_filter = filter;
 621    ctx->sampler.mag_img_filter = filter;
 622    cso_single_sampler(ctx->cso, 0, &ctx->sampler);
 623    cso_single_sampler_done(ctx->cso);
 624
 625    /* viewport */
 626    ctx->viewport.scale[0] = 0.5f * dst->width;
 627    ctx->viewport.scale[1] = 0.5f * dst->height;
 628    ctx->viewport.scale[2] = 0.5f;
 629    ctx->viewport.scale[3] = 1.0f;
 630    ctx->viewport.translate[0] = 0.5f * dst->width;
 631    ctx->viewport.translate[1] = 0.5f * dst->height;
 632    ctx->viewport.translate[2] = 0.5f;
 633    ctx->viewport.translate[3] = 0.0f;
 634    cso_set_viewport(ctx->cso, &ctx->viewport);
 635
 636    /* texture */
 637    cso_set_fragment_sampler_views(ctx->cso, 1, &src_sampler_view);
 638
 639    /* shaders */
 640    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[TGSI_WRITEMASK_XYZW]);
 641    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 642
 643    /* drawing dest */
 644    memset(&fb, 0, sizeof(fb));
 645    fb.width = dst->width;
 646    fb.height = dst->height;
 647    fb.nr_cbufs = 1;
 648    fb.cbufs[0] = dst;
 649    cso_set_framebuffer(ctx->cso, &fb);
 650
 651    /* draw quad */
 652    offset = setup_vertex_data_tex(ctx,
 653                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 654                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 655                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 656                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 657                                   s0, t0, s1, t1,
 658                                   z);
 659
 660    util_draw_vertex_buffer(ctx->pipe,
 661                            ctx->vbuf, offset,
 662                            PIPE_PRIM_TRIANGLE_FAN,
 663                            4,  /* verts */
 664                            2); /* attribs/vert */
 665
 666    /* restore state we changed */
 667    cso_restore_blend(ctx->cso);
 668    cso_restore_depth_stencil_alpha(ctx->cso);
 669    cso_restore_rasterizer(ctx->cso);
 670    cso_restore_samplers(ctx->cso);
 671    cso_restore_fragment_sampler_views(ctx->cso);
 672    cso_restore_framebuffer(ctx->cso);
 673    cso_restore_fragment_shader(ctx->cso);
 674    cso_restore_vertex_shader(ctx->cso);
 675    cso_restore_clip(ctx->cso);
 676    cso_restore_vertex_elements(ctx->cso);
 677 }