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    1 /**************************************************************************
    2  *
    3  * Copyright 2008 VMware, Inc.
    4  * All Rights Reserved.
    5  *
    6  * Permission is hereby granted, free of charge, to any person obtaining a
    7  * copy of this software and associated documentation files (the
    8  * "Software"), to deal in the Software without restriction, including
    9  * without limitation the rights to use, copy, modify, merge, publish,
   10  * distribute, sub license, and/or sell copies of the Software, and to
   11  * permit persons to whom the Software is furnished to do so, subject to
   12  * the following conditions:
   13  *
   14  * The above copyright notice and this permission notice (including the
   15  * next paragraph) shall be included in all copies or substantial portions
   16  * of the Software.
   17  *
   18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
   21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
   22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
   23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   25  *
   26  **************************************************************************/
   27 
   28 /**
   29  * @file
   30  * Copy/blit pixel rect between surfaces
   31  *
   32  * @author Brian Paul
   33  */
   34 
   35 
   36 #include "pipe/p_context.h"
   37 #include "util/u_debug.h"
   38 #include "pipe/p_defines.h"
   39 #include "util/u_inlines.h"
   40 #include "pipe/p_shader_tokens.h"
   41 #include "pipe/p_state.h"
   42 
   43 #include "util/u_blit.h"
   44 #include "util/u_draw_quad.h"
   45 #include "util/format/u_format.h"
   46 #include "util/u_math.h"
   47 #include "util/u_memory.h"
   48 #include "util/u_sampler.h"
   49 #include "util/u_texture.h"
   50 #include "util/u_simple_shaders.h"
   51 
   52 #include "cso_cache/cso_context.h"
   53 
   54 
   55 struct blit_state
   56 {
   57    struct pipe_context *pipe;
   58    struct cso_context *cso;
   59 
   60    struct pipe_blend_state blend_write_color;
   61    struct pipe_depth_stencil_alpha_state dsa_keep_depthstencil;
   62    struct pipe_rasterizer_state rasterizer;
   63    struct pipe_sampler_state sampler;
   64    struct pipe_viewport_state viewport;
   65    struct cso_velems_state velem;
   66 
   67    void *vs;
   68    void *fs[PIPE_MAX_TEXTURE_TYPES][4];
   69 
   70    struct pipe_resource *vbuf;  /**< quad vertices */
   71    unsigned vbuf_slot;
   72 
   73    float vertices[4][2][4];   /**< vertex/texcoords for quad */
   74 };
   75 
   76 
   77 /**
   78  * Create state object for blit.
   79  * Intended to be created once and re-used for many blit() calls.
   80  */
   81 struct blit_state *
   82 util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
   83 {
   84    struct blit_state *ctx;
   85    uint i;
   86 
   87    ctx = CALLOC_STRUCT(blit_state);
   88    if (!ctx)
   89       return NULL;
   90 
   91    ctx->pipe = pipe;
   92    ctx->cso = cso;
   93 
   94    /* disabled blending/masking */
   95    ctx->blend_write_color.rt[0].colormask = PIPE_MASK_RGBA;
   96 
   97    /* rasterizer */
   98    ctx->rasterizer.cull_face = PIPE_FACE_NONE;
   99    ctx->rasterizer.half_pixel_center = 1;
  100    ctx->rasterizer.bottom_edge_rule = 1;
  101    ctx->rasterizer.depth_clip_near = 1;
  102    ctx->rasterizer.depth_clip_far = 1;
  103 
  104    /* samplers */
  105    ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  106    ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  107    ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  108    ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
  109    ctx->sampler.min_img_filter = 0; /* set later */
  110    ctx->sampler.mag_img_filter = 0; /* set later */
  111 
  112    /* vertex elements state */
  113    ctx->velem.count = 2;
  114    for (i = 0; i < 2; i++) {
  115       ctx->velem.velems[i].src_offset = i * 4 * sizeof(float);
  116       ctx->velem.velems[i].instance_divisor = 0;
  117       ctx->velem.velems[i].vertex_buffer_index = 0;
  118       ctx->velem.velems[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  119    }
  120 
  121    ctx->vbuf = NULL;
  122 
  123    /* init vertex data that doesn't change */
  124    for (i = 0; i < 4; i++) {
  125       ctx->vertices[i][0][3] = 1.0f; /* w */
  126       ctx->vertices[i][1][3] = 1.0f; /* q */
  127    }
  128 
  129    return ctx;
  130 }
  131 
  132 
  133 /**
  134  * Destroy a blit context
  135  */
  136 void
  137 util_destroy_blit(struct blit_state *ctx)
  138 {
  139    struct pipe_context *pipe = ctx->pipe;
  140    unsigned i, j;
  141 
  142    if (ctx->vs)
  143       pipe->delete_vs_state(pipe, ctx->vs);
  144 
  145    for (i = 0; i < ARRAY_SIZE(ctx->fs); i++) {
  146       for (j = 0; j < ARRAY_SIZE(ctx->fs[i]); j++) {
  147          if (ctx->fs[i][j])
  148             pipe->delete_fs_state(pipe, ctx->fs[i][j]);
  149       }
  150    }
  151 
  152    pipe_resource_reference(&ctx->vbuf, NULL);
  153 
  154    FREE(ctx);
  155 }
  156 
  157 
  158 /**
  159  * Helper function to set the fragment shaders.
  160  */
  161 static inline void
  162 set_fragment_shader(struct blit_state *ctx,
  163                     enum pipe_format format,
  164                     boolean src_xrbias,
  165                     enum pipe_texture_target pipe_tex)
  166 {
  167    enum tgsi_return_type stype;
  168    unsigned idx;
  169 
  170    if (util_format_is_pure_uint(format)) {
  171       stype = TGSI_RETURN_TYPE_UINT;
  172       idx = 0;
  173    } else if (util_format_is_pure_sint(format)) {
  174       stype = TGSI_RETURN_TYPE_SINT;
  175       idx = 1;
  176    } else {
  177       stype = TGSI_RETURN_TYPE_FLOAT;
  178       idx = 2;
  179    }
  180 
  181    if (src_xrbias) {
  182       assert(stype == TGSI_RETURN_TYPE_FLOAT);
  183       idx = 3;
  184       if (!ctx->fs[pipe_tex][idx]) {
  185          enum tgsi_texture_type tgsi_tex =
  186             util_pipe_tex_to_tgsi_tex(pipe_tex, 0);
  187          ctx->fs[pipe_tex][idx] =
  188             util_make_fragment_tex_shader_xrbias(ctx->pipe, tgsi_tex);
  189       }
  190    }
  191    else if (!ctx->fs[pipe_tex][idx]) {
  192       enum tgsi_texture_type tgsi_tex = util_pipe_tex_to_tgsi_tex(pipe_tex, 0);
  193 
  194       /* OpenGL does not allow blits from signed to unsigned integer
  195        * or vice versa. */
  196       ctx->fs[pipe_tex][idx] =
  197          util_make_fragment_tex_shader_writemask(ctx->pipe, tgsi_tex,
  198                                                  TGSI_INTERPOLATE_LINEAR,
  199                                                  TGSI_WRITEMASK_XYZW,
  200                                                  stype, stype, false, false);
  201    }
  202 
  203    cso_set_fragment_shader_handle(ctx->cso, ctx->fs[pipe_tex][idx]);
  204 }
  205 
  206 
  207 /**
  208  * Helper function to set the vertex shader.
  209  */
  210 static inline void
  211 set_vertex_shader(struct blit_state *ctx)
  212 {
  213    /* vertex shader - still required to provide the linkage between
  214     * fragment shader input semantics and vertex_element/buffers.
  215     */
  216    if (!ctx->vs) {
  217       const enum tgsi_semantic semantic_names[] = {
  218          TGSI_SEMANTIC_POSITION,
  219          TGSI_SEMANTIC_GENERIC
  220       };
  221       const uint semantic_indexes[] = { 0, 0 };
  222       ctx->vs = util_make_vertex_passthrough_shader(ctx->pipe, 2,
  223                                                     semantic_names,
  224                                                     semantic_indexes, FALSE);
  225    }
  226 
  227    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
  228 }
  229 
  230 
  231 /**
  232  * Get offset of next free slot in vertex buffer for quad vertices.
  233  */
  234 static unsigned
  235 get_next_slot(struct blit_state *ctx)
  236 {
  237    const unsigned max_slots = 4096 / sizeof ctx->vertices;
  238 
  239    if (ctx->vbuf_slot >= max_slots) {
  240       pipe_resource_reference(&ctx->vbuf, NULL);
  241       ctx->vbuf_slot = 0;
  242    }
  243 
  244    if (!ctx->vbuf) {
  245       ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
  246                                      PIPE_BIND_VERTEX_BUFFER,
  247                                      PIPE_USAGE_STREAM,
  248                                      max_slots * sizeof ctx->vertices);
  249    }
  250 
  251    return ctx->vbuf_slot++ * sizeof ctx->vertices;
  252 }
  253 
  254 
  255 
  256 
  257 /**
  258  * Setup vertex data for the textured quad we'll draw.
  259  * Note: y=0=top
  260  *
  261  * FIXME: We should call util_map_texcoords2d_onto_cubemap
  262  * for cubemaps.
  263  */
  264 static unsigned
  265 setup_vertex_data_tex(struct blit_state *ctx,
  266                       enum pipe_texture_target src_target,
  267                       unsigned src_face,
  268                       float x0, float y0, float x1, float y1,
  269                       float s0, float t0, float s1, float t1,
  270                       float z)
  271 {
  272    unsigned offset;
  273 
  274    ctx->vertices[0][0][0] = x0;
  275    ctx->vertices[0][0][1] = y0;
  276    ctx->vertices[0][0][2] = z;
  277    ctx->vertices[0][1][0] = s0; /*s*/
  278    ctx->vertices[0][1][1] = t0; /*t*/
  279    ctx->vertices[0][1][2] = 0;  /*r*/
  280 
  281    ctx->vertices[1][0][0] = x1;
  282    ctx->vertices[1][0][1] = y0;
  283    ctx->vertices[1][0][2] = z;
  284    ctx->vertices[1][1][0] = s1; /*s*/
  285    ctx->vertices[1][1][1] = t0; /*t*/
  286    ctx->vertices[1][1][2] = 0;  /*r*/
  287 
  288    ctx->vertices[2][0][0] = x1;
  289    ctx->vertices[2][0][1] = y1;
  290    ctx->vertices[2][0][2] = z;
  291    ctx->vertices[2][1][0] = s1;
  292    ctx->vertices[2][1][1] = t1;
  293    ctx->vertices[3][1][2] = 0;
  294 
  295    ctx->vertices[3][0][0] = x0;
  296    ctx->vertices[3][0][1] = y1;
  297    ctx->vertices[3][0][2] = z;
  298    ctx->vertices[3][1][0] = s0;
  299    ctx->vertices[3][1][1] = t1;
  300    ctx->vertices[3][1][2] = 0;
  301 
  302    if (src_target == PIPE_TEXTURE_CUBE ||
  303        src_target == PIPE_TEXTURE_CUBE_ARRAY) {
  304       /* Map cubemap texture coordinates inplace. */
  305       const unsigned stride =
  306          sizeof ctx->vertices[0] / sizeof ctx->vertices[0][0][0];
  307       util_map_texcoords2d_onto_cubemap(src_face,
  308                                         &ctx->vertices[0][1][0], stride,
  309                                         &ctx->vertices[0][1][0], stride,
  310                                         TRUE);
  311    }
  312 
  313    offset = get_next_slot(ctx);
  314 
  315    if (ctx->vbuf) {
  316       pipe_buffer_write_nooverlap(ctx->pipe, ctx->vbuf,
  317                                   offset, sizeof(ctx->vertices), ctx->vertices);
  318    }
  319 
  320    return offset;
  321 }
  322 
  323 
  324 /**
  325  * \return TRUE if two regions overlap, FALSE otherwise
  326  */
  327 static boolean
  328 regions_overlap(int srcX0, int srcY0,
  329                 int srcX1, int srcY1,
  330                 int dstX0, int dstY0,
  331                 int dstX1, int dstY1)
  332 {
  333    if (MAX2(srcX0, srcX1) <= MIN2(dstX0, dstX1))
  334       return FALSE; /* src completely left of dst */
  335 
  336    if (MAX2(dstX0, dstX1) <= MIN2(srcX0, srcX1))
  337       return FALSE; /* dst completely left of src */
  338 
  339    if (MAX2(srcY0, srcY1) <= MIN2(dstY0, dstY1))
  340       return FALSE; /* src completely above dst */
  341 
  342    if (MAX2(dstY0, dstY1) <= MIN2(srcY0, srcY1))
  343       return FALSE; /* dst completely above src */
  344 
  345    return TRUE; /* some overlap */
  346 }
  347 
  348 
  349 /**
  350  * Can we blit from src format to dest format with a simple copy?
  351  */
  352 static boolean
  353 formats_compatible(enum pipe_format src_format,
  354                    enum pipe_format dst_format)
  355 {
  356    if (src_format == dst_format) {
  357       return TRUE;
  358    }
  359    else {
  360       const struct util_format_description *src_desc =
  361          util_format_description(src_format);
  362       const struct util_format_description *dst_desc =
  363          util_format_description(dst_format);
  364       return util_is_format_compatible(src_desc, dst_desc);
  365    }
  366 }
  367 
  368 
  369 /**
  370  * Copy pixel block from src surface to dst surface.
  371  * Overlapping regions are acceptable.
  372  * Flipping and stretching are supported.
  373  * \param filter  one of PIPE_TEX_FILTER_NEAREST/LINEAR
  374  * \param writemask  bitmask of PIPE_MASK_[RGBAZS].  Controls which channels
  375  *                   in the dest surface are sourced from the src surface.
  376  *                   Disabled color channels are sourced from (0,0,0,1).
  377  */
  378 void
  379 util_blit_pixels(struct blit_state *ctx,
  380                  struct pipe_resource *src_tex,
  381                  unsigned src_level,
  382                  int srcX0, int srcY0,
  383                  int srcX1, int srcY1,
  384                  int srcZ0,
  385                  struct pipe_surface *dst,
  386                  int dstX0, int dstY0,
  387                  int dstX1, int dstY1,
  388                  ASSERTED float z,
  389                  enum pipe_tex_filter filter,
  390                  uint writemask)
  391 {
  392    struct pipe_context *pipe = ctx->pipe;
  393    enum pipe_format src_format, dst_format;
  394    const int srcW = abs(srcX1 - srcX0);
  395    const int srcH = abs(srcY1 - srcY0);
  396    boolean overlap;
  397    boolean is_stencil, is_depth, blit_depth, blit_stencil;
  398    const struct util_format_description *src_desc =
  399          util_format_description(src_tex->format);
  400    struct pipe_blit_info info;
  401 
  402    assert(filter == PIPE_TEX_FILTER_NEAREST ||
  403           filter == PIPE_TEX_FILTER_LINEAR);
  404 
  405    assert(src_level <= src_tex->last_level);
  406 
  407    /* do the regions overlap? */
  408    overlap = src_tex == dst->texture &&
  409              dst->u.tex.level == src_level &&
  410              dst->u.tex.first_layer == srcZ0 &&
  411       regions_overlap(srcX0, srcY0, srcX1, srcY1,
  412                       dstX0, dstY0, dstX1, dstY1);
  413 
  414    src_format = util_format_linear(src_tex->format);
  415    dst_format = util_format_linear(dst->texture->format);
  416 
  417    /* See whether we will blit depth or stencil. */
  418    is_depth = util_format_has_depth(src_desc);
  419    is_stencil = util_format_has_stencil(src_desc);
  420 
  421    blit_depth = is_depth && (writemask & PIPE_MASK_Z);
  422    blit_stencil = is_stencil && (writemask & PIPE_MASK_S);
  423 
  424    if (is_depth || is_stencil) {
  425       assert((writemask & PIPE_MASK_RGBA) == 0);
  426       assert(blit_depth || blit_stencil);
  427    }
  428    else {
  429       assert((writemask & PIPE_MASK_ZS) == 0);
  430       assert(!blit_depth);
  431       assert(!blit_stencil);
  432    }
  433 
  434    /*
  435     * XXX: z parameter is deprecated. dst->u.tex.first_layer
  436     * specificies the destination layer.
  437     */
  438    assert(z == 0.0f);
  439 
  440    /*
  441     * Check for simple case:  no format conversion, no flipping, no stretching,
  442     * no overlapping, same number of samples.
  443     * Filter mode should not matter since there's no stretching.
  444     */
  445    if (formats_compatible(src_format, dst_format) &&
  446        src_tex->nr_samples == dst->texture->nr_samples &&
  447        is_stencil == blit_stencil &&
  448        is_depth == blit_depth &&
  449        srcX0 < srcX1 &&
  450        dstX0 < dstX1 &&
  451        srcY0 < srcY1 &&
  452        dstY0 < dstY1 &&
  453        (dstX1 - dstX0) == (srcX1 - srcX0) &&
  454        (dstY1 - dstY0) == (srcY1 - srcY0) &&
  455        !overlap) {
  456       struct pipe_box src_box;
  457       src_box.x = srcX0;
  458       src_box.y = srcY0;
  459       src_box.z = srcZ0;
  460       src_box.width = srcW;
  461       src_box.height = srcH;
  462       src_box.depth = 1;
  463       pipe->resource_copy_region(pipe,
  464                                  dst->texture, dst->u.tex.level,
  465                                  dstX0, dstY0, dst->u.tex.first_layer,/* dest */
  466                                  src_tex, src_level,
  467                                  &src_box);
  468       return;
  469    }
  470 
  471    memset(&info, 0, sizeof info);
  472    info.dst.resource = dst->texture;
  473    info.dst.level = dst->u.tex.level;
  474    info.dst.box.x = dstX0;
  475    info.dst.box.y = dstY0;
  476    info.dst.box.z = dst->u.tex.first_layer;
  477    info.dst.box.width = dstX1 - dstX0;
  478    info.dst.box.height = dstY1 - dstY0;
  479    assert(info.dst.box.width >= 0);
  480    assert(info.dst.box.height >= 0);
  481    info.dst.box.depth = 1;
  482    info.dst.format = dst_format;
  483    info.src.resource = src_tex;
  484    info.src.level = src_level;
  485    info.src.box.x = srcX0;
  486    info.src.box.y = srcY0;
  487    info.src.box.z = srcZ0;
  488    info.src.box.width = srcX1 - srcX0;
  489    info.src.box.height = srcY1 - srcY0;
  490    info.src.box.depth = 1;
  491    info.src.format = src_format;
  492    info.mask = writemask;
  493    info.filter = filter;
  494    info.scissor_enable = 0;
  495 
  496    pipe->blit(pipe, &info);
  497 }
  498 
  499 
  500 /**
  501  * Copy pixel block from src sampler view to dst surface.
  502  *
  503  * The sampler view's first_level field indicates the source
  504  * mipmap level to use.
  505  *
  506  * The sampler view's first_layer indicate the layer to use, but for
  507  * cube maps it must point to the first face.  Face is passed in src_face.
  508  *
  509  * The main advantage over util_blit_pixels is that it allows to specify
  510  * swizzles in pipe_sampler_view::swizzle_?.
  511  *
  512  * But there is no control over blitting Z and/or stencil.
  513  */
  514 void
  515 util_blit_pixels_tex(struct blit_state *ctx,
  516                      struct pipe_sampler_view *src_sampler_view,
  517                      int srcX0, int srcY0,
  518                      int srcX1, int srcY1,
  519                      unsigned src_face,
  520                      struct pipe_surface *dst,
  521                      int dstX0, int dstY0,
  522                      int dstX1, int dstY1,
  523                      float z, enum pipe_tex_filter filter,
  524                      boolean src_xrbias)
  525 {
  526    boolean normalized = src_sampler_view->texture->target != PIPE_TEXTURE_RECT;
  527    struct pipe_framebuffer_state fb;
  528    float s0, t0, s1, t1;
  529    unsigned offset;
  530    struct pipe_resource *tex = src_sampler_view->texture;
  531 
  532    assert(filter == PIPE_TEX_FILTER_NEAREST ||
  533           filter == PIPE_TEX_FILTER_LINEAR);
  534 
  535    assert(tex);
  536    assert(tex->width0 != 0);
  537    assert(tex->height0 != 0);
  538 
  539    s0 = (float) srcX0;
  540    s1 = (float) srcX1;
  541    t0 = (float) srcY0;
  542    t1 = (float) srcY1;
  543 
  544    if (normalized) {
  545       /* normalize according to the mipmap level's size */
  546       int level = src_sampler_view->u.tex.first_level;
  547       float w = (float) u_minify(tex->width0, level);
  548       float h = (float) u_minify(tex->height0, level);
  549       s0 /= w;
  550       s1 /= w;
  551       t0 /= h;
  552       t1 /= h;
  553    }
  554 
  555    assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
  556                                                  PIPE_TEXTURE_2D,
  557                                                  dst->texture->nr_samples,
  558                                                  dst->texture->nr_storage_samples,
  559                                                  PIPE_BIND_RENDER_TARGET));
  560 
  561    /* save state (restored below) */
  562    cso_save_state(ctx->cso, (CSO_BIT_BLEND |
  563                              CSO_BIT_DEPTH_STENCIL_ALPHA |
  564                              CSO_BIT_RASTERIZER |
  565                              CSO_BIT_SAMPLE_MASK |
  566                              CSO_BIT_MIN_SAMPLES |
  567                              CSO_BIT_FRAGMENT_SAMPLERS |
  568                              CSO_BIT_FRAGMENT_SAMPLER_VIEWS |
  569                              CSO_BIT_STREAM_OUTPUTS |
  570                              CSO_BIT_VIEWPORT |
  571                              CSO_BIT_FRAMEBUFFER |
  572                              CSO_BIT_PAUSE_QUERIES |
  573                              CSO_BIT_FRAGMENT_SHADER |
  574                              CSO_BIT_VERTEX_SHADER |
  575                              CSO_BIT_TESSCTRL_SHADER |
  576                              CSO_BIT_TESSEVAL_SHADER |
  577                              CSO_BIT_GEOMETRY_SHADER |
  578                              CSO_BIT_VERTEX_ELEMENTS |
  579                              CSO_BIT_AUX_VERTEX_BUFFER_SLOT));
  580 
  581    /* set misc state we care about */
  582    cso_set_blend(ctx->cso, &ctx->blend_write_color);
  583    cso_set_depth_stencil_alpha(ctx->cso, &ctx->dsa_keep_depthstencil);
  584    cso_set_sample_mask(ctx->cso, ~0);
  585    cso_set_min_samples(ctx->cso, 1);
  586    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
  587    cso_set_vertex_elements(ctx->cso, &ctx->velem);
  588    cso_set_stream_outputs(ctx->cso, 0, NULL, NULL);
  589 
  590    /* sampler */
  591    ctx->sampler.normalized_coords = normalized;
  592    ctx->sampler.min_img_filter = filter;
  593    ctx->sampler.mag_img_filter = filter;
  594    {
  595       const struct pipe_sampler_state *samplers[] = {&ctx->sampler};
  596       cso_set_samplers(ctx->cso, PIPE_SHADER_FRAGMENT, 1, samplers);
  597    }
  598 
  599    /* viewport */
  600    ctx->viewport.scale[0] = 0.5f * dst->width;
  601    ctx->viewport.scale[1] = 0.5f * dst->height;
  602    ctx->viewport.scale[2] = 0.5f;
  603    ctx->viewport.translate[0] = 0.5f * dst->width;
  604    ctx->viewport.translate[1] = 0.5f * dst->height;
  605    ctx->viewport.translate[2] = 0.5f;
  606    cso_set_viewport(ctx->cso, &ctx->viewport);
  607 
  608    /* texture */
  609    cso_set_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT, 1, &src_sampler_view);
  610 
  611    /* shaders */
  612    set_fragment_shader(ctx, src_sampler_view->format,
  613                        src_xrbias,
  614                        src_sampler_view->texture->target);
  615    set_vertex_shader(ctx);
  616    cso_set_tessctrl_shader_handle(ctx->cso, NULL);
  617    cso_set_tesseval_shader_handle(ctx->cso, NULL);
  618    cso_set_geometry_shader_handle(ctx->cso, NULL);
  619 
  620    /* drawing dest */
  621    memset(&fb, 0, sizeof(fb));
  622    fb.width = dst->width;
  623    fb.height = dst->height;
  624    fb.nr_cbufs = 1;
  625    fb.cbufs[0] = dst;
  626    cso_set_framebuffer(ctx->cso, &fb);
  627 
  628    /* draw quad */
  629    offset = setup_vertex_data_tex(ctx,
  630                                   src_sampler_view->texture->target,
  631                                   src_face,
  632                                   (float) dstX0 / dst->width * 2.0f - 1.0f,
  633                                   (float) dstY0 / dst->height * 2.0f - 1.0f,
  634                                   (float) dstX1 / dst->width * 2.0f - 1.0f,
  635                                   (float) dstY1 / dst->height * 2.0f - 1.0f,
  636                                   s0, t0, s1, t1,
  637                                   z);
  638 
  639    util_draw_vertex_buffer(ctx->pipe, ctx->cso, ctx->vbuf, 0,
  640                            offset,
  641                            PIPE_PRIM_TRIANGLE_FAN,
  642                            4,  /* verts */
  643                            2); /* attribs/vert */
  644 
  645    /* restore state we changed */
  646    cso_restore_state(ctx->cso);
  647 }