src/gallium/state_trackers/vega/renderer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.  All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  **************************************************************************/
  26
  27 #include "renderer.h"
  28
  29 #include "vg_context.h"
  30
  31 #include "pipe/p_context.h"
  32 #include "pipe/p_state.h"
  33 #include "util/u_inlines.h"
  34 #include "pipe/p_screen.h"
  35 #include "pipe/p_shader_tokens.h"
  36
  37 #include "util/u_draw_quad.h"
  38 #include "util/u_format.h"
  39 #include "util/u_simple_shaders.h"
  40 #include "util/u_memory.h"
  41 #include "util/u_rect.h"
  42 #include "util/u_sampler.h"
  43 #include "util/u_surface.h"
  44
  45 #include "cso_cache/cso_context.h"
  46
  47 struct renderer {
  48    struct pipe_context *pipe;
  49    struct vg_context *owner;
  50
  51    struct cso_context *cso;
  52
  53    void *fs;
  54
  55    VGfloat vertices[4][2][4];
  56 };
  57
  58 static void setup_shaders(struct renderer *ctx)
  59 {
  60    struct pipe_context *pipe = ctx->pipe;
  61    /* fragment shader */
  62    ctx->fs = util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_2D,
  63                                            TGSI_INTERPOLATE_LINEAR);
  64 }
  65
  66 static struct pipe_resource *
  67 setup_vertex_data(struct renderer *ctx,
  68                   float x0, float y0, float x1, float y1, float z)
  69 {
  70    ctx->vertices[0][0][0] = x0;
  71    ctx->vertices[0][0][1] = y0;
  72    ctx->vertices[0][0][2] = z;
  73    ctx->vertices[0][1][0] = 0.0f; /*s*/
  74    ctx->vertices[0][1][1] = 0.0f; /*t*/
  75
  76    ctx->vertices[1][0][0] = x1;
  77    ctx->vertices[1][0][1] = y0;
  78    ctx->vertices[1][0][2] = z;
  79    ctx->vertices[1][1][0] = 1.0f; /*s*/
  80    ctx->vertices[1][1][1] = 0.0f; /*t*/
  81
  82    ctx->vertices[2][0][0] = x1;
  83    ctx->vertices[2][0][1] = y1;
  84    ctx->vertices[2][0][2] = z;
  85    ctx->vertices[2][1][0] = 1.0f;
  86    ctx->vertices[2][1][1] = 1.0f;
  87
  88    ctx->vertices[3][0][0] = x0;
  89    ctx->vertices[3][0][1] = y1;
  90    ctx->vertices[3][0][2] = z;
  91    ctx->vertices[3][1][0] = 0.0f;
  92    ctx->vertices[3][1][1] = 1.0f;
  93
  94    return pipe_user_buffer_create( ctx->pipe->screen,
  95                                    ctx->vertices,
  96                                    sizeof(ctx->vertices),
  97                                    PIPE_BIND_VERTEX_BUFFER);
  98 }
  99
 100 static struct pipe_resource *
 101 setup_vertex_data_tex(struct renderer *ctx,
 102                       float x0, float y0, float x1, float y1,
 103                       float s0, float t0, float s1, float t1,
 104                       float z)
 105 {
 106    ctx->vertices[0][0][0] = x0;
 107    ctx->vertices[0][0][1] = y0;
 108    ctx->vertices[0][0][2] = z;
 109    ctx->vertices[0][1][0] = s0; /*s*/
 110    ctx->vertices[0][1][1] = t0; /*t*/
 111
 112    ctx->vertices[1][0][0] = x1;
 113    ctx->vertices[1][0][1] = y0;
 114    ctx->vertices[1][0][2] = z;
 115    ctx->vertices[1][1][0] = s1; /*s*/
 116    ctx->vertices[1][1][1] = t0; /*t*/
 117
 118    ctx->vertices[2][0][0] = x1;
 119    ctx->vertices[2][0][1] = y1;
 120    ctx->vertices[2][0][2] = z;
 121    ctx->vertices[2][1][0] = s1;
 122    ctx->vertices[2][1][1] = t1;
 123
 124    ctx->vertices[3][0][0] = x0;
 125    ctx->vertices[3][0][1] = y1;
 126    ctx->vertices[3][0][2] = z;
 127    ctx->vertices[3][1][0] = s0;
 128    ctx->vertices[3][1][1] = t1;
 129
 130    return pipe_user_buffer_create( ctx->pipe->screen,
 131                                    ctx->vertices,
 132                                    sizeof(ctx->vertices),
 133                                    PIPE_BIND_VERTEX_BUFFER);
 134 }
 135
 136
 137 static struct pipe_resource *
 138 setup_vertex_data_qtex(struct renderer *ctx,
 139                        float x0, float y0, float x1, float y1,
 140                        float x2, float y2, float x3, float y3,
 141                        float s0, float t0, float s1, float t1,
 142                        float z)
 143 {
 144    ctx->vertices[0][0][0] = x0;
 145    ctx->vertices[0][0][1] = y0;
 146    ctx->vertices[0][0][2] = z;
 147    ctx->vertices[0][1][0] = s0; /*s*/
 148    ctx->vertices[0][1][1] = t0; /*t*/
 149
 150    ctx->vertices[1][0][0] = x1;
 151    ctx->vertices[1][0][1] = y1;
 152    ctx->vertices[1][0][2] = z;
 153    ctx->vertices[1][1][0] = s1; /*s*/
 154    ctx->vertices[1][1][1] = t0; /*t*/
 155
 156    ctx->vertices[2][0][0] = x2;
 157    ctx->vertices[2][0][1] = y2;
 158    ctx->vertices[2][0][2] = z;
 159    ctx->vertices[2][1][0] = s1;
 160    ctx->vertices[2][1][1] = t1;
 161
 162    ctx->vertices[3][0][0] = x3;
 163    ctx->vertices[3][0][1] = y3;
 164    ctx->vertices[3][0][2] = z;
 165    ctx->vertices[3][1][0] = s0;
 166    ctx->vertices[3][1][1] = t1;
 167
 168    return pipe_user_buffer_create( ctx->pipe->screen,
 169                                    ctx->vertices,
 170                                    sizeof(ctx->vertices),
 171                                    PIPE_BIND_VERTEX_BUFFER);
 172 }
 173
 174 struct renderer * renderer_create(struct vg_context *owner)
 175 {
 176    VGint i;
 177    struct renderer *renderer = CALLOC_STRUCT(renderer);
 178
 179    if (!renderer)
 180       return NULL;
 181
 182    renderer->owner = owner;
 183    renderer->pipe = owner->pipe;
 184    renderer->cso = owner->cso_context;
 185
 186    setup_shaders(renderer);
 187
 188    /* init vertex data that doesn't change */
 189    for (i = 0; i < 4; i++) {
 190       renderer->vertices[i][0][3] = 1.0f; /* w */
 191       renderer->vertices[i][1][2] = 0.0f; /* r */
 192       renderer->vertices[i][1][3] = 1.0f; /* q */
 193    }
 194
 195    return renderer;
 196 }
 197
 198 void renderer_destroy(struct renderer *ctx)
 199 {
 200 #if 0
 201    if (ctx->fs) {
 202       cso_delete_fragment_shader(ctx->cso, ctx->fs);
 203       ctx->fs = NULL;
 204    }
 205 #endif
 206    FREE(ctx);
 207 }
 208
 209 void renderer_draw_quad(struct renderer *r,
 210                         VGfloat x1, VGfloat y1,
 211                         VGfloat x2, VGfloat y2,
 212                         VGfloat depth)
 213 {
 214    struct pipe_resource *buf;
 215
 216    buf = setup_vertex_data(r, x1, y1, x2, y2, depth);
 217
 218    if (buf) {
 219       cso_set_vertex_elements(r->cso, 2, r->owner->velems);
 220       util_draw_vertex_buffer(r->pipe, buf, 0,
 221                               PIPE_PRIM_TRIANGLE_FAN,
 222                               4,  /* verts */
 223                               2); /* attribs/vert */
 224
 225       pipe_resource_reference( &buf,
 226                              NULL );
 227    }
 228 }
 229
 230 void renderer_draw_texture(struct renderer *r,
 231                            struct pipe_resource *tex,
 232                            VGfloat x1offset, VGfloat y1offset,
 233                            VGfloat x2offset, VGfloat y2offset,
 234                            VGfloat x1, VGfloat y1,
 235                            VGfloat x2, VGfloat y2)
 236 {
 237    struct pipe_context *pipe = r->pipe;
 238    struct pipe_resource *buf;
 239    VGfloat s0, t0, s1, t1;
 240
 241    assert(tex->width0 != 0);
 242    assert(tex->height0 != 0);
 243
 244    s0 = x1offset / tex->width0;
 245    s1 = x2offset / tex->width0;
 246    t0 = y1offset / tex->height0;
 247    t1 = y2offset / tex->height0;
 248
 249    cso_save_vertex_shader(r->cso);
 250    /* shaders */
 251    cso_set_vertex_shader_handle(r->cso, vg_texture_vs(r->owner));
 252
 253    /* draw quad */
 254    buf = setup_vertex_data_tex(r, x1, y1, x2, y2,
 255                                s0, t0, s1, t1, 0.0f);
 256
 257    if (buf) {
 258       cso_set_vertex_elements(r->cso, 2, r->owner->velems);
 259       util_draw_vertex_buffer(pipe, buf, 0,
 260                            PIPE_PRIM_TRIANGLE_FAN,
 261                            4,  /* verts */
 262                            2); /* attribs/vert */
 263
 264       pipe_resource_reference( &buf,
 265                              NULL );
 266    }
 267
 268    cso_restore_vertex_shader(r->cso);
 269 }
 270
 271 void renderer_copy_texture(struct renderer *ctx,
 272                            struct pipe_sampler_view *src,
 273                            VGfloat sx1, VGfloat sy1,
 274                            VGfloat sx2, VGfloat sy2,
 275                            struct pipe_resource *dst,
 276                            VGfloat dx1, VGfloat dy1,
 277                            VGfloat dx2, VGfloat dy2)
 278 {
 279    struct pipe_context *pipe = ctx->pipe;
 280    struct pipe_screen *screen = pipe->screen;
 281    struct pipe_resource *tex = src->texture;
 282    struct pipe_resource *buf;
 283    struct pipe_surface *dst_surf = screen->get_tex_surface(
 284       screen, dst, 0, 0, 0,
 285       PIPE_BIND_RENDER_TARGET);
 286    struct pipe_framebuffer_state fb;
 287    float s0, t0, s1, t1;
 288
 289    assert(tex->width0 != 0);
 290    assert(tex->height0 != 0);
 291    assert(dst->width0 != 0);
 292    assert(dst->height0 != 0);
 293
 294 #if 0
 295    debug_printf("copy texture [%f, %f, %f, %f], [%f, %f, %f, %f]\n",
 296                 sx1, sy1, sx2, sy2, dx1, dy1, dx2, dy2);
 297 #endif
 298
 299 #if 1
 300    s0 = sx1 / tex->width0;
 301    s1 = sx2 / tex->width0;
 302    t0 = sy1 / tex->height0;
 303    t1 = sy2 / tex->height0;
 304 #else
 305    s0 = 0;
 306    s1 = 1;
 307    t0 = 0;
 308    t1 = 1;
 309 #endif
 310
 311    assert(screen->is_format_supported(screen, dst_surf->format, PIPE_TEXTURE_2D,
 312                                       0, PIPE_BIND_RENDER_TARGET, 0));
 313
 314    /* save state (restored below) */
 315    cso_save_blend(ctx->cso);
 316    cso_save_samplers(ctx->cso);
 317    cso_save_fragment_sampler_views(ctx->cso);
 318    cso_save_framebuffer(ctx->cso);
 319    cso_save_fragment_shader(ctx->cso);
 320    cso_save_vertex_shader(ctx->cso);
 321
 322    cso_save_viewport(ctx->cso);
 323
 324
 325    /* set misc state we care about */
 326    {
 327       struct pipe_blend_state blend;
 328       memset(&blend, 0, sizeof(blend));
 329       blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 330       blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 331       blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
 332       blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 333       blend.rt[0].colormask = PIPE_MASK_RGBA;
 334       cso_set_blend(ctx->cso, &blend);
 335    }
 336
 337    /* sampler */
 338    {
 339       struct pipe_sampler_state sampler;
 340       memset(&sampler, 0, sizeof(sampler));
 341       sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 342       sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 343       sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 344       sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 345       sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 346       sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 347       sampler.normalized_coords = 1;
 348       cso_single_sampler(ctx->cso, 0, &sampler);
 349       cso_single_sampler_done(ctx->cso);
 350    }
 351
 352    vg_set_viewport(ctx->owner, VEGA_Y0_TOP);
 353
 354    /* texture */
 355    cso_set_fragment_sampler_views(ctx->cso, 1, &src);
 356
 357    /* shaders */
 358    cso_set_vertex_shader_handle(ctx->cso, vg_texture_vs(ctx->owner));
 359    cso_set_fragment_shader_handle(ctx->cso, ctx->fs);
 360
 361    /* drawing dest */
 362    memset(&fb, 0, sizeof(fb));
 363    fb.width = dst_surf->width;
 364    fb.height = dst_surf->height;
 365    fb.nr_cbufs = 1;
 366    fb.cbufs[0] = dst_surf;
 367    {
 368       VGint i;
 369       for (i = 1; i < PIPE_MAX_COLOR_BUFS; ++i)
 370          fb.cbufs[i] = 0;
 371    }
 372    cso_set_framebuffer(ctx->cso, &fb);
 373
 374    /* draw quad */
 375    buf = setup_vertex_data_tex(ctx,
 376                          dx1, dy1,
 377                          dx2, dy2,
 378                          s0, t0, s1, t1,
 379                          0.0f);
 380
 381    if (buf) {
 382       cso_set_vertex_elements(ctx->cso, 2, ctx->owner->velems);
 383       util_draw_vertex_buffer(ctx->pipe, buf, 0,
 384                               PIPE_PRIM_TRIANGLE_FAN,
 385                               4,  /* verts */
 386                               2); /* attribs/vert */
 387
 388       pipe_resource_reference( &buf,
 389                              NULL );
 390    }
 391
 392    /* restore state we changed */
 393    cso_restore_blend(ctx->cso);
 394    cso_restore_samplers(ctx->cso);
 395    cso_restore_fragment_sampler_views(ctx->cso);
 396    cso_restore_framebuffer(ctx->cso);
 397    cso_restore_vertex_shader(ctx->cso);
 398    cso_restore_fragment_shader(ctx->cso);
 399    cso_restore_viewport(ctx->cso);
 400
 401    pipe_surface_reference(&dst_surf, NULL);
 402 }
 403
 404 void renderer_copy_surface(struct renderer *ctx,
 405                            struct pipe_surface *src,
 406                            int srcX0, int srcY0,
 407                            int srcX1, int srcY1,
 408                            struct pipe_surface *dst,
 409                            int dstX0, int dstY0,
 410                            int dstX1, int dstY1,
 411                            float z, unsigned filter)
 412 {
 413    struct pipe_context *pipe = ctx->pipe;
 414    struct pipe_screen *screen = pipe->screen;
 415    struct pipe_resource *buf;
 416    struct pipe_sampler_view view_templ;
 417    struct pipe_sampler_view *view;
 418    struct pipe_resource texTemp, *tex;
 419    struct pipe_subresource subsrc, subdst;
 420    struct pipe_framebuffer_state fb;
 421    struct st_framebuffer *stfb = ctx->owner->draw_buffer;
 422    const int srcW = abs(srcX1 - srcX0);
 423    const int srcH = abs(srcY1 - srcY0);
 424    const int srcLeft = MIN2(srcX0, srcX1);
 425    const int srcTop = MIN2(srcY0, srcY1);
 426
 427    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
 428           filter == PIPE_TEX_MIPFILTER_LINEAR);
 429
 430    if (srcLeft != srcX0) {
 431       /* left-right flip */
 432       int tmp = dstX0;
 433       dstX0 = dstX1;
 434       dstX1 = tmp;
 435    }
 436
 437    if (srcTop != srcY0) {
 438       /* up-down flip */
 439       int tmp = dstY0;
 440       dstY0 = dstY1;
 441       dstY1 = tmp;
 442    }
 443
 444    assert(screen->is_format_supported(screen, src->format, PIPE_TEXTURE_2D,
 445                                       0, PIPE_BIND_SAMPLER_VIEW, 0));
 446    assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
 447                                       0, PIPE_BIND_SAMPLER_VIEW, 0));
 448    assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
 449                                       0, PIPE_BIND_RENDER_TARGET, 0));
 450
 451    /*
 452     * XXX for now we're always creating a temporary texture.
 453     * Strictly speaking that's not always needed.
 454     */
 455
 456    /* create temp texture */
 457    memset(&texTemp, 0, sizeof(texTemp));
 458    texTemp.target = PIPE_TEXTURE_2D;
 459    texTemp.format = src->format;
 460    texTemp.last_level = 0;
 461    texTemp.width0 = srcW;
 462    texTemp.height0 = srcH;
 463    texTemp.depth0 = 1;
 464    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 465
 466    tex = screen->resource_create(screen, &texTemp);
 467    if (!tex)
 468       return;
 469
 470    u_sampler_view_default_template(&view_templ, tex, tex->format);
 471    view = pipe->create_sampler_view(pipe, tex, &view_templ);
 472
 473    if (!view)
 474       return;
 475
 476    subdst.face = 0;
 477    subdst.level = 0;
 478    subsrc.face = src->face;
 479    subsrc.level = src->level;
 480
 481    pipe->resource_copy_region(pipe,
 482                               tex, subdst, 0, 0, 0,  /* dest */
 483                               src->texture, subsrc, srcLeft, srcTop, src->zslice, /* src */
 484                               srcW, srcH);     /* size */
 485
 486    /* save state (restored below) */
 487    cso_save_blend(ctx->cso);
 488    cso_save_samplers(ctx->cso);
 489    cso_save_fragment_sampler_views(ctx->cso);
 490    cso_save_framebuffer(ctx->cso);
 491    cso_save_fragment_shader(ctx->cso);
 492    cso_save_vertex_shader(ctx->cso);
 493    cso_save_viewport(ctx->cso);
 494
 495    /* set misc state we care about */
 496    {
 497       struct pipe_blend_state blend;
 498       memset(&blend, 0, sizeof(blend));
 499       blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 500       blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 501       blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
 502       blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 503       blend.rt[0].colormask = PIPE_MASK_RGBA;
 504       cso_set_blend(ctx->cso, &blend);
 505    }
 506
 507    vg_set_viewport(ctx->owner, VEGA_Y0_TOP);
 508
 509    /* sampler */
 510    {
 511       struct pipe_sampler_state sampler;
 512       memset(&sampler, 0, sizeof(sampler));
 513       sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 514       sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 515       sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 516       sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 517       sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 518       sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 519       sampler.normalized_coords = 1;
 520       cso_single_sampler(ctx->cso, 0, &sampler);
 521       cso_single_sampler_done(ctx->cso);
 522    }
 523
 524    /* texture */
 525    cso_set_fragment_sampler_views(ctx->cso, 1, &view);
 526
 527    /* shaders */
 528    cso_set_fragment_shader_handle(ctx->cso, ctx->fs);
 529    cso_set_vertex_shader_handle(ctx->cso, vg_texture_vs(ctx->owner));
 530
 531    /* drawing dest */
 532    if (stfb->strb->surface != dst) {
 533       memset(&fb, 0, sizeof(fb));
 534       fb.width = dst->width;
 535       fb.height = dst->height;
 536       fb.nr_cbufs = 1;
 537       fb.cbufs[0] = dst;
 538       fb.zsbuf = stfb->dsrb->surface;
 539       cso_set_framebuffer(ctx->cso, &fb);
 540    }
 541
 542    /* draw quad */
 543    buf = setup_vertex_data(ctx,
 544                            (float) dstX0, (float) dstY0,
 545                            (float) dstX1, (float) dstY1, z);
 546
 547    if (buf) {
 548       cso_set_vertex_elements(ctx->cso, 2, ctx->owner->velems);
 549       util_draw_vertex_buffer(ctx->pipe, buf, 0,
 550                               PIPE_PRIM_TRIANGLE_FAN,
 551                               4,  /* verts */
 552                               2); /* attribs/vert */
 553
 554       pipe_resource_reference( &buf,
 555                              NULL );
 556    }
 557
 558
 559    /* restore state we changed */
 560    cso_restore_blend(ctx->cso);
 561    cso_restore_samplers(ctx->cso);
 562    cso_restore_fragment_sampler_views(ctx->cso);
 563    cso_restore_framebuffer(ctx->cso);
 564    cso_restore_fragment_shader(ctx->cso);
 565    cso_restore_vertex_shader(ctx->cso);
 566    cso_restore_viewport(ctx->cso);
 567
 568    pipe_resource_reference(&tex, NULL);
 569    pipe_sampler_view_reference(&view, NULL);
 570 }
 571
 572 void renderer_texture_quad(struct renderer *r,
 573                            struct pipe_resource *tex,
 574                            VGfloat x1offset, VGfloat y1offset,
 575                            VGfloat x2offset, VGfloat y2offset,
 576                            VGfloat x1, VGfloat y1,
 577                            VGfloat x2, VGfloat y2,
 578                            VGfloat x3, VGfloat y3,
 579                            VGfloat x4, VGfloat y4)
 580 {
 581    struct pipe_context *pipe = r->pipe;
 582    struct pipe_resource *buf;
 583    VGfloat s0, t0, s1, t1;
 584
 585    assert(tex->width0 != 0);
 586    assert(tex->height0 != 0);
 587
 588    s0 = x1offset / tex->width0;
 589    s1 = x2offset / tex->width0;
 590    t0 = y1offset / tex->height0;
 591    t1 = y2offset / tex->height0;
 592
 593    cso_save_vertex_shader(r->cso);
 594    /* shaders */
 595    cso_set_vertex_shader_handle(r->cso, vg_texture_vs(r->owner));
 596
 597    /* draw quad */
 598    buf = setup_vertex_data_qtex(r, x1, y1, x2, y2, x3, y3, x4, y4,
 599                           s0, t0, s1, t1, 0.0f);
 600
 601    if (buf) {
 602       cso_set_vertex_elements(r->cso, 2, r->owner->velems);
 603       util_draw_vertex_buffer(pipe, buf, 0,
 604                               PIPE_PRIM_TRIANGLE_FAN,
 605                               4,  /* verts */
 606                               2); /* attribs/vert */
 607
 608       pipe_resource_reference(&buf,
 609                             NULL);
 610    }
 611
 612    cso_restore_vertex_shader(r->cso);
 613 }