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    enum pipe_texture_target internal_target;
  66
  67    void *vs;
  68    void *fs[TGSI_WRITEMASK_XYZW + 1];
  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    memset(&ctx->blend, 0, sizeof(ctx->blend));
  96    ctx->blend.rt[0].colormask = PIPE_MASK_RGBA;
  97
  98    /* no-op depth/stencil/alpha */
  99    memset(&ctx->depthstencil, 0, sizeof(ctx->depthstencil));
 100
 101    /* rasterizer */
 102    memset(&ctx->rasterizer, 0, sizeof(ctx->rasterizer));
 103    ctx->rasterizer.cull_face = PIPE_FACE_NONE;
 104    ctx->rasterizer.gl_rasterization_rules = 1;
 105
 106    /* samplers */
 107    memset(&ctx->sampler, 0, sizeof(ctx->sampler));
 108    ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 109    ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 110    ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 111    ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 112    ctx->sampler.min_img_filter = 0; /* set later */
 113    ctx->sampler.mag_img_filter = 0; /* set later */
 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    if(pipe->screen->get_param(pipe->screen, PIPE_CAP_NPOT_TEXTURES))
 149       ctx->internal_target = PIPE_TEXTURE_2D;
 150    else
 151       ctx->internal_target = PIPE_TEXTURE_RECT;
 152
 153    return ctx;
 154 }
 155
 156
 157 /**
 158  * Destroy a blit context
 159  */
 160 void
 161 util_destroy_blit(struct blit_state *ctx)
 162 {
 163    struct pipe_context *pipe = ctx->pipe;
 164    unsigned i;
 165
 166    pipe->delete_vs_state(pipe, ctx->vs);
 167
 168    for (i = 0; i < Elements(ctx->fs); i++)
 169       if (ctx->fs[i])
 170          pipe->delete_fs_state(pipe, ctx->fs[i]);
 171
 172    pipe_resource_reference(&ctx->vbuf, NULL);
 173
 174    FREE(ctx);
 175 }
 176
 177
 178 /**
 179  * Get offset of next free slot in vertex buffer for quad vertices.
 180  */
 181 static unsigned
 182 get_next_slot( struct blit_state *ctx )
 183 {
 184    const unsigned max_slots = 4096 / sizeof ctx->vertices;
 185
 186    if (ctx->vbuf_slot >= max_slots)
 187       util_blit_flush( ctx );
 188
 189    if (!ctx->vbuf) {
 190       ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
 191                                      PIPE_BIND_VERTEX_BUFFER,
 192                                      max_slots * sizeof ctx->vertices);
 193    }
 194
 195    return ctx->vbuf_slot++ * sizeof ctx->vertices;
 196 }
 197
 198
 199
 200
 201 /**
 202  * Setup vertex data for the textured quad we'll draw.
 203  * Note: y=0=top
 204  */
 205 static unsigned
 206 setup_vertex_data_tex(struct blit_state *ctx,
 207                       float x0, float y0, float x1, float y1,
 208                       float s0, float t0, float s1, float t1,
 209                       float z)
 210 {
 211    unsigned offset;
 212
 213    ctx->vertices[0][0][0] = x0;
 214    ctx->vertices[0][0][1] = y0;
 215    ctx->vertices[0][0][2] = z;
 216    ctx->vertices[0][1][0] = s0; /*s*/
 217    ctx->vertices[0][1][1] = t0; /*t*/
 218
 219    ctx->vertices[1][0][0] = x1;
 220    ctx->vertices[1][0][1] = y0;
 221    ctx->vertices[1][0][2] = z;
 222    ctx->vertices[1][1][0] = s1; /*s*/
 223    ctx->vertices[1][1][1] = t0; /*t*/
 224
 225    ctx->vertices[2][0][0] = x1;
 226    ctx->vertices[2][0][1] = y1;
 227    ctx->vertices[2][0][2] = z;
 228    ctx->vertices[2][1][0] = s1;
 229    ctx->vertices[2][1][1] = t1;
 230
 231    ctx->vertices[3][0][0] = x0;
 232    ctx->vertices[3][0][1] = y1;
 233    ctx->vertices[3][0][2] = z;
 234    ctx->vertices[3][1][0] = s0;
 235    ctx->vertices[3][1][1] = t1;
 236
 237    offset = get_next_slot( ctx );
 238
 239    pipe_buffer_write_nooverlap(ctx->pipe, ctx->vbuf,
 240                                offset, sizeof(ctx->vertices), ctx->vertices);
 241
 242    return offset;
 243 }
 244
 245
 246 /**
 247  * \return TRUE if two regions overlap, FALSE otherwise
 248  */
 249 static boolean
 250 regions_overlap(int srcX0, int srcY0,
 251                 int srcX1, int srcY1,
 252                 int dstX0, int dstY0,
 253                 int dstX1, int dstY1)
 254 {
 255    if (MAX2(srcX0, srcX1) < MIN2(dstX0, dstX1))
 256       return FALSE; /* src completely left of dst */
 257
 258    if (MAX2(dstX0, dstX1) < MIN2(srcX0, srcX1))
 259       return FALSE; /* dst completely left of src */
 260
 261    if (MAX2(srcY0, srcY1) < MIN2(dstY0, dstY1))
 262       return FALSE; /* src completely above dst */
 263
 264    if (MAX2(dstY0, dstY1) < MIN2(srcY0, srcY1))
 265       return FALSE; /* dst completely above src */
 266
 267    return TRUE; /* some overlap */
 268 }
 269
 270
 271 /**
 272  * Copy pixel block from src surface to dst surface.
 273  * Overlapping regions are acceptable.
 274  * Flipping and stretching are supported.
 275  * \param filter  one of PIPE_TEX_MIPFILTER_NEAREST/LINEAR
 276  * \param writemask  controls which channels in the dest surface are sourced
 277  *                   from the src surface.  Disabled channels are sourced
 278  *                   from (0,0,0,1).
 279  * XXX need some control over blitting Z and/or stencil.
 280  */
 281 void
 282 util_blit_pixels_writemask(struct blit_state *ctx,
 283                            struct pipe_resource *src_tex,
 284                            struct pipe_subresource srcsub,
 285                            int srcX0, int srcY0,
 286                            int srcX1, int srcY1,
 287                            int srcZ0,
 288                            struct pipe_surface *dst,
 289                            int dstX0, int dstY0,
 290                            int dstX1, int dstY1,
 291                            float z, uint filter,
 292                            uint writemask)
 293 {
 294    struct pipe_context *pipe = ctx->pipe;
 295    struct pipe_screen *screen = pipe->screen;
 296    struct pipe_sampler_view *sampler_view = NULL;
 297    struct pipe_sampler_view sv_templ;
 298    struct pipe_framebuffer_state fb;
 299    const int srcW = abs(srcX1 - srcX0);
 300    const int srcH = abs(srcY1 - srcY0);
 301    unsigned offset;
 302    boolean overlap;
 303    float s0, t0, s1, t1;
 304    boolean normalized;
 305
 306    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 307           filter == PIPE_TEX_MIPFILTER_LINEAR);
 308
 309    assert(srcsub.level <= src_tex->last_level);
 310
 311    /* do the regions overlap? */
 312    overlap = src_tex == dst->texture &&
 313              dst->face == srcsub.face &&
 314              dst->level == srcsub.level &&
 315              dst->zslice == srcZ0 &&
 316       regions_overlap(srcX0, srcY0, srcX1, srcY1,
 317                       dstX0, dstY0, dstX1, dstY1);
 318
 319    /*
 320     * Check for simple case:  no format conversion, no flipping, no stretching,
 321     * no overlapping.
 322     * Filter mode should not matter since there's no stretching.
 323     */
 324    if (dst->format == src_tex->format &&
 325        srcX0 < srcX1 &&
 326        dstX0 < dstX1 &&
 327        srcY0 < srcY1 &&
 328        dstY0 < dstY1 &&
 329        (dstX1 - dstX0) == (srcX1 - srcX0) &&
 330        (dstY1 - dstY0) == (srcY1 - srcY0) &&
 331        !overlap) {
 332       struct pipe_subresource subdst;
 333       subdst.face = dst->face;
 334       subdst.level = dst->level;
 335       pipe->resource_copy_region(pipe,
 336                                  dst->texture, subdst,
 337                                  dstX0, dstY0, dst->zslice,/* dest */
 338                                  src_tex, srcsub,
 339                                  srcX0, srcY0, srcZ0,/* src */
 340                                  srcW, srcH);       /* size */
 341       return;
 342    }
 343
 344    /* Create a temporary texture when src and dest alias or when src
 345     * is anything other than a 2d texture.
 346     * XXX should just use appropriate shader to access 1d / 3d slice / cube face,
 347     * much like the u_blitter code does (should be pretty trivial).
 348     *
 349     * This can still be improved upon.
 350     */
 351    if ((src_tex == dst->texture &&
 352        dst->face == srcsub.face &&
 353        dst->level == srcsub.level &&
 354        dst->zslice == srcZ0) ||
 355        (src_tex->target != PIPE_TEXTURE_2D &&
 356        src_tex->target != PIPE_TEXTURE_RECT))
 357    {
 358       struct pipe_resource texTemp;
 359       struct pipe_resource *tex;
 360       struct pipe_sampler_view sv_templ;
 361       struct pipe_subresource texsub;
 362       const int srcLeft = MIN2(srcX0, srcX1);
 363       const int srcTop = MIN2(srcY0, srcY1);
 364
 365       if (srcLeft != srcX0) {
 366          /* left-right flip */
 367          int tmp = dstX0;
 368          dstX0 = dstX1;
 369          dstX1 = tmp;
 370       }
 371
 372       if (srcTop != srcY0) {
 373          /* up-down flip */
 374          int tmp = dstY0;
 375          dstY0 = dstY1;
 376          dstY1 = tmp;
 377       }
 378
 379       /* create temp texture */
 380       memset(&texTemp, 0, sizeof(texTemp));
 381       texTemp.target = ctx->internal_target;
 382       texTemp.format = src_tex->format;
 383       texTemp.last_level = 0;
 384       texTemp.width0 = srcW;
 385       texTemp.height0 = srcH;
 386       texTemp.depth0 = 1;
 387       texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 388
 389       tex = screen->resource_create(screen, &texTemp);
 390       if (!tex)
 391          return;
 392
 393       texsub.face = 0;
 394       texsub.level = 0;
 395       /* load temp texture */
 396       pipe->resource_copy_region(pipe,
 397                                  tex, texsub, 0, 0, 0,  /* dest */
 398                                  src_tex, srcsub, srcLeft, srcTop, srcZ0, /* src */
 399                                  srcW, srcH);     /* size */
 400
 401       normalized = tex->target != PIPE_TEXTURE_RECT;
 402       if(normalized) {
 403          s0 = 0.0f;
 404          s1 = 1.0f;
 405          t0 = 0.0f;
 406          t1 = 1.0f;
 407       }
 408       else {
 409          s0 = 0;
 410          s1 = srcW;
 411          t0 = 0;
 412          t1 = srcH;
 413       }
 414
 415       u_sampler_view_default_template(&sv_templ, tex, tex->format);
 416       sampler_view = pipe->create_sampler_view(pipe, tex, &sv_templ);
 417
 418       if (!sampler_view) {
 419          pipe_resource_reference(&tex, NULL);
 420          return;
 421       }
 422       pipe_resource_reference(&tex, NULL);
 423    }
 424    else {
 425       u_sampler_view_default_template(&sv_templ, src_tex, src_tex->format);
 426       sv_templ.first_level = sv_templ.last_level = srcsub.level;
 427       sampler_view = pipe->create_sampler_view(pipe, src_tex, &sv_templ);
 428
 429       if (!sampler_view) {
 430          return;
 431       }
 432
 433       s0 = srcX0;
 434       s1 = srcX1;
 435       t0 = srcY0;
 436       t1 = srcY1;
 437       normalized = sampler_view->texture->target != PIPE_TEXTURE_RECT;
 438       if(normalized)
 439       {
 440          s0 /= (float)(u_minify(sampler_view->texture->width0, srcsub.level));
 441          s1 /= (float)(u_minify(sampler_view->texture->width0, srcsub.level));
 442          t0 /= (float)(u_minify(sampler_view->texture->height0, srcsub.level));
 443          t1 /= (float)(u_minify(sampler_view->texture->height0, srcsub.level));
 444       }
 445    }
 446
 447
 448    assert(screen->is_format_supported(screen, sampler_view->format, ctx->internal_target,
 449                                       sampler_view->texture->nr_samples,
 450                                       PIPE_BIND_SAMPLER_VIEW, 0));
 451    assert(screen->is_format_supported(screen, dst->format, ctx->internal_target,
 452                                       dst->texture->nr_samples,
 453                                       PIPE_BIND_RENDER_TARGET, 0));
 454
 455    /* save state (restored below) */
 456    cso_save_blend(ctx->cso);
 457    cso_save_depth_stencil_alpha(ctx->cso);
 458    cso_save_rasterizer(ctx->cso);
 459    cso_save_samplers(ctx->cso);
 460    cso_save_fragment_sampler_views(ctx->cso);
 461    cso_save_viewport(ctx->cso);
 462    cso_save_framebuffer(ctx->cso);
 463    cso_save_fragment_shader(ctx->cso);
 464    cso_save_vertex_shader(ctx->cso);
 465    cso_save_clip(ctx->cso);
 466    cso_save_vertex_elements(ctx->cso);
 467
 468    /* set misc state we care about */
 469    cso_set_blend(ctx->cso, &ctx->blend);
 470    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
 471    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 472    cso_set_clip(ctx->cso, &ctx->clip);
 473    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 474
 475    /* sampler */
 476    ctx->sampler.normalized_coords = normalized;
 477    ctx->sampler.min_img_filter = filter;
 478    ctx->sampler.mag_img_filter = filter;
 479    /* we've limited this already with the sampler view but you never know... */
 480    ctx->sampler.min_lod = srcsub.level;
 481    ctx->sampler.max_lod = srcsub.level;
 482    cso_single_sampler(ctx->cso, 0, &ctx->sampler);
 483    cso_single_sampler_done(ctx->cso);
 484
 485    /* viewport */
 486    ctx->viewport.scale[0] = 0.5f * dst->width;
 487    ctx->viewport.scale[1] = 0.5f * dst->height;
 488    ctx->viewport.scale[2] = 0.5f;
 489    ctx->viewport.scale[3] = 1.0f;
 490    ctx->viewport.translate[0] = 0.5f * dst->width;
 491    ctx->viewport.translate[1] = 0.5f * dst->height;
 492    ctx->viewport.translate[2] = 0.5f;
 493    ctx->viewport.translate[3] = 0.0f;
 494    cso_set_viewport(ctx->cso, &ctx->viewport);
 495
 496    /* texture */
 497    cso_set_fragment_sampler_views(ctx->cso, 1, &sampler_view);
 498
 499    if (ctx->fs[writemask] == NULL)
 500       ctx->fs[writemask] =
 501          util_make_fragment_tex_shader_writemask(pipe, TGSI_TEXTURE_2D,
 502                                                  TGSI_INTERPOLATE_LINEAR,
 503                                                  writemask);
 504
 505    /* shaders */
 506    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[writemask]);
 507    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 508
 509    /* drawing dest */
 510    memset(&fb, 0, sizeof(fb));
 511    fb.width = dst->width;
 512    fb.height = dst->height;
 513    fb.nr_cbufs = 1;
 514    fb.cbufs[0] = dst;
 515    cso_set_framebuffer(ctx->cso, &fb);
 516
 517    /* draw quad */
 518    offset = setup_vertex_data_tex(ctx,
 519                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 520                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 521                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 522                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 523                                   s0, t0,
 524                                   s1, t1,
 525                                   z);
 526
 527    util_draw_vertex_buffer(ctx->pipe, ctx->vbuf, offset,
 528                            PIPE_PRIM_TRIANGLE_FAN,
 529                            4,  /* verts */
 530                            2); /* attribs/vert */
 531
 532    /* restore state we changed */
 533    cso_restore_blend(ctx->cso);
 534    cso_restore_depth_stencil_alpha(ctx->cso);
 535    cso_restore_rasterizer(ctx->cso);
 536    cso_restore_samplers(ctx->cso);
 537    cso_restore_fragment_sampler_views(ctx->cso);
 538    cso_restore_viewport(ctx->cso);
 539    cso_restore_framebuffer(ctx->cso);
 540    cso_restore_fragment_shader(ctx->cso);
 541    cso_restore_vertex_shader(ctx->cso);
 542    cso_restore_clip(ctx->cso);
 543    cso_restore_vertex_elements(ctx->cso);
 544
 545    pipe_sampler_view_reference(&sampler_view, NULL);
 546 }
 547
 548
 549 void
 550 util_blit_pixels(struct blit_state *ctx,
 551                  struct pipe_resource *src_tex,
 552                  struct pipe_subresource srcsub,
 553                  int srcX0, int srcY0,
 554                  int srcX1, int srcY1,
 555                  int srcZ,
 556                  struct pipe_surface *dst,
 557                  int dstX0, int dstY0,
 558                  int dstX1, int dstY1,
 559                  float z, uint filter )
 560 {
 561    util_blit_pixels_writemask( ctx, src_tex,
 562                                srcsub,
 563                                srcX0, srcY0,
 564                                srcX1, srcY1,
 565                                srcZ,
 566                                dst,
 567                                dstX0, dstY0,
 568                                dstX1, dstY1,
 569                                z, filter,
 570                                TGSI_WRITEMASK_XYZW );
 571 }
 572
 573
 574 /* Release vertex buffer at end of frame to avoid synchronous
 575  * rendering.
 576  */
 577 void util_blit_flush( struct blit_state *ctx )
 578 {
 579    pipe_resource_reference(&ctx->vbuf, NULL);
 580    ctx->vbuf_slot = 0;
 581 }
 582
 583
 584
 585 /**
 586  * Copy pixel block from src texture to dst surface.
 587  *
 588  * XXX Should support selection of level.
 589  * XXX need some control over blitting Z and/or stencil.
 590  */
 591 void
 592 util_blit_pixels_tex(struct blit_state *ctx,
 593                      struct pipe_sampler_view *src_sampler_view,
 594                      int srcX0, int srcY0,
 595                      int srcX1, int srcY1,
 596                      struct pipe_surface *dst,
 597                      int dstX0, int dstY0,
 598                      int dstX1, int dstY1,
 599                      float z, uint filter)
 600 {
 601    boolean normalized = src_sampler_view->texture->target != PIPE_TEXTURE_RECT;
 602    struct pipe_framebuffer_state fb;
 603    float s0, t0, s1, t1;
 604    unsigned offset;
 605    struct pipe_resource *tex = src_sampler_view->texture;
 606
 607    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 608           filter == PIPE_TEX_MIPFILTER_LINEAR);
 609
 610    assert(tex);
 611    assert(tex->width0 != 0);
 612    assert(tex->height0 != 0);
 613
 614    s0 = srcX0;
 615    s1 = srcX1;
 616    t0 = srcY0;
 617    t1 = srcY1;
 618
 619    if(normalized)
 620    {
 621       s0 /= (float)tex->width0;
 622       s1 /= (float)tex->width0;
 623       t0 /= (float)tex->height0;
 624       t1 /= (float)tex->height0;
 625    }
 626
 627    assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
 628                                                  PIPE_TEXTURE_2D,
 629                                                  dst->texture->nr_samples,
 630                                                  PIPE_BIND_RENDER_TARGET,
 631                                                  0));
 632
 633    /* save state (restored below) */
 634    cso_save_blend(ctx->cso);
 635    cso_save_depth_stencil_alpha(ctx->cso);
 636    cso_save_rasterizer(ctx->cso);
 637    cso_save_samplers(ctx->cso);
 638    cso_save_fragment_sampler_views(ctx->cso);
 639    cso_save_framebuffer(ctx->cso);
 640    cso_save_fragment_shader(ctx->cso);
 641    cso_save_vertex_shader(ctx->cso);
 642    cso_save_clip(ctx->cso);
 643    cso_save_vertex_elements(ctx->cso);
 644
 645    /* set misc state we care about */
 646    cso_set_blend(ctx->cso, &ctx->blend);
 647    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
 648    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
 649    cso_set_clip(ctx->cso, &ctx->clip);
 650    cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
 651
 652    /* sampler */
 653    ctx->sampler.normalized_coords = normalized;
 654    ctx->sampler.min_img_filter = filter;
 655    ctx->sampler.mag_img_filter = filter;
 656    cso_single_sampler(ctx->cso, 0, &ctx->sampler);
 657    cso_single_sampler_done(ctx->cso);
 658
 659    /* viewport */
 660    ctx->viewport.scale[0] = 0.5f * dst->width;
 661    ctx->viewport.scale[1] = 0.5f * dst->height;
 662    ctx->viewport.scale[2] = 0.5f;
 663    ctx->viewport.scale[3] = 1.0f;
 664    ctx->viewport.translate[0] = 0.5f * dst->width;
 665    ctx->viewport.translate[1] = 0.5f * dst->height;
 666    ctx->viewport.translate[2] = 0.5f;
 667    ctx->viewport.translate[3] = 0.0f;
 668    cso_set_viewport(ctx->cso, &ctx->viewport);
 669
 670    /* texture */
 671    cso_set_fragment_sampler_views(ctx->cso, 1, &src_sampler_view);
 672
 673    /* shaders */
 674    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[TGSI_WRITEMASK_XYZW]);
 675    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
 676
 677    /* drawing dest */
 678    memset(&fb, 0, sizeof(fb));
 679    fb.width = dst->width;
 680    fb.height = dst->height;
 681    fb.nr_cbufs = 1;
 682    fb.cbufs[0] = dst;
 683    cso_set_framebuffer(ctx->cso, &fb);
 684
 685    /* draw quad */
 686    offset = setup_vertex_data_tex(ctx,
 687                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
 688                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
 689                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
 690                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
 691                                   s0, t0, s1, t1,
 692                                   z);
 693
 694    util_draw_vertex_buffer(ctx->pipe,
 695                            ctx->vbuf, offset,
 696                            PIPE_PRIM_TRIANGLE_FAN,
 697                            4,  /* verts */
 698                            2); /* attribs/vert */
 699
 700    /* restore state we changed */
 701    cso_restore_blend(ctx->cso);
 702    cso_restore_depth_stencil_alpha(ctx->cso);
 703    cso_restore_rasterizer(ctx->cso);
 704    cso_restore_samplers(ctx->cso);
 705    cso_restore_fragment_sampler_views(ctx->cso);
 706    cso_restore_framebuffer(ctx->cso);
 707    cso_restore_fragment_shader(ctx->cso);
 708    cso_restore_vertex_shader(ctx->cso);
 709    cso_restore_clip(ctx->cso);
 710    cso_restore_vertex_elements(ctx->cso);
 711 }