src/gallium/state_trackers/vega/vg_context.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 "vg_context.h"
  28
  29 #include "paint.h"
  30 #include "renderer.h"
  31 #include "shaders_cache.h"
  32 #include "shader.h"
  33 #include "asm_util.h"
  34 #include "st_inlines.h"
  35 #include "vg_manager.h"
  36
  37 #include "pipe/p_context.h"
  38 #include "util/u_inlines.h"
  39 #include "pipe/p_shader_tokens.h"
  40
  41 #include "cso_cache/cso_context.h"
  42
  43 #include "util/u_simple_shaders.h"
  44 #include "util/u_memory.h"
  45 #include "util/u_blit.h"
  46
  47 struct vg_context *_vg_context = 0;
  48
  49 struct vg_context * vg_current_context(void)
  50 {
  51    return _vg_context;
  52 }
  53
  54 static void init_clear(struct vg_context *st)
  55 {
  56    struct pipe_context *pipe = st->pipe;
  57
  58    /* rasterizer state: bypass clipping */
  59    memset(&st->clear.raster, 0, sizeof(st->clear.raster));
  60    st->clear.raster.gl_rasterization_rules = 1;
  61
  62    /* fragment shader state: color pass-through program */
  63    st->clear.fs =
  64       util_make_fragment_passthrough_shader(pipe);
  65 }
  66 void vg_set_current_context(struct vg_context *ctx)
  67 {
  68    _vg_context = ctx;
  69 }
  70
  71 struct vg_context * vg_create_context(struct pipe_context *pipe,
  72                                       const void *visual,
  73                                       struct vg_context *share)
  74 {
  75    struct vg_context *ctx;
  76    unsigned i;
  77
  78    ctx = CALLOC_STRUCT(vg_context);
  79
  80    ctx->pipe = pipe;
  81
  82    vg_init_state(&ctx->state.vg);
  83    ctx->state.dirty = ALL_DIRTY;
  84
  85    ctx->cso_context = cso_create_context(pipe);
  86
  87    init_clear(ctx);
  88
  89    ctx->default_paint = paint_create(ctx);
  90    ctx->state.vg.stroke_paint = ctx->default_paint;
  91    ctx->state.vg.fill_paint = ctx->default_paint;
  92
  93
  94    ctx->mask.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  95    ctx->mask.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  96    ctx->mask.sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
  97    ctx->mask.sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
  98    ctx->mask.sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
  99    ctx->mask.sampler.normalized_coords = 0;
 100
 101    ctx->blend_sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 102    ctx->blend_sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 103    ctx->blend_sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 104    ctx->blend_sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 105    ctx->blend_sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 106    ctx->blend_sampler.normalized_coords = 0;
 107
 108    for (i = 0; i < 2; i++) {
 109       ctx->velems[i].src_offset = i * 4 * sizeof(float);
 110       ctx->velems[i].instance_divisor = 0;
 111       ctx->velems[i].vertex_buffer_index = 0;
 112       ctx->velems[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 113    }
 114
 115    vg_set_error(ctx, VG_NO_ERROR);
 116
 117    ctx->owned_objects[VG_OBJECT_PAINT] = cso_hash_create();
 118    ctx->owned_objects[VG_OBJECT_IMAGE] = cso_hash_create();
 119    ctx->owned_objects[VG_OBJECT_MASK] = cso_hash_create();
 120    ctx->owned_objects[VG_OBJECT_FONT] = cso_hash_create();
 121    ctx->owned_objects[VG_OBJECT_PATH] = cso_hash_create();
 122
 123    ctx->renderer = renderer_create(ctx);
 124    ctx->sc = shaders_cache_create(ctx);
 125    ctx->shader = shader_create(ctx);
 126
 127    ctx->blit = util_create_blit(ctx->pipe, ctx->cso_context);
 128
 129    return ctx;
 130 }
 131
 132 void vg_destroy_context(struct vg_context *ctx)
 133 {
 134    struct pipe_buffer **cbuf = &ctx->mask.cbuf;
 135    struct pipe_buffer **vsbuf = &ctx->vs_const_buffer;
 136
 137    util_destroy_blit(ctx->blit);
 138    renderer_destroy(ctx->renderer);
 139    shaders_cache_destroy(ctx->sc);
 140    shader_destroy(ctx->shader);
 141    paint_destroy(ctx->default_paint);
 142
 143    if (*cbuf)
 144       pipe_buffer_reference(cbuf, NULL);
 145
 146    if (*vsbuf)
 147       pipe_buffer_reference(vsbuf, NULL);
 148
 149    if (ctx->clear.fs) {
 150       cso_delete_fragment_shader(ctx->cso_context, ctx->clear.fs);
 151       ctx->clear.fs = NULL;
 152    }
 153
 154    if (ctx->plain_vs) {
 155       vg_shader_destroy(ctx, ctx->plain_vs);
 156       ctx->plain_vs = NULL;
 157    }
 158    if (ctx->clear_vs) {
 159       vg_shader_destroy(ctx, ctx->clear_vs);
 160       ctx->clear_vs = NULL;
 161    }
 162    if (ctx->texture_vs) {
 163       vg_shader_destroy(ctx, ctx->texture_vs);
 164       ctx->texture_vs = NULL;
 165    }
 166
 167    if (ctx->pass_through_depth_fs)
 168       vg_shader_destroy(ctx, ctx->pass_through_depth_fs);
 169    if (ctx->mask.union_fs)
 170       vg_shader_destroy(ctx, ctx->mask.union_fs);
 171    if (ctx->mask.intersect_fs)
 172       vg_shader_destroy(ctx, ctx->mask.intersect_fs);
 173    if (ctx->mask.subtract_fs)
 174       vg_shader_destroy(ctx, ctx->mask.subtract_fs);
 175    if (ctx->mask.set_fs)
 176       vg_shader_destroy(ctx, ctx->mask.set_fs);
 177
 178    cso_release_all(ctx->cso_context);
 179    cso_destroy_context(ctx->cso_context);
 180
 181    cso_hash_delete(ctx->owned_objects[VG_OBJECT_PAINT]);
 182    cso_hash_delete(ctx->owned_objects[VG_OBJECT_IMAGE]);
 183    cso_hash_delete(ctx->owned_objects[VG_OBJECT_MASK]);
 184    cso_hash_delete(ctx->owned_objects[VG_OBJECT_FONT]);
 185    cso_hash_delete(ctx->owned_objects[VG_OBJECT_PATH]);
 186
 187    free(ctx);
 188 }
 189
 190 void vg_init_object(struct vg_object *obj, struct vg_context *ctx, enum vg_object_type type)
 191 {
 192    obj->type = type;
 193    obj->ctx = ctx;
 194 }
 195
 196 VGboolean vg_context_is_object_valid(struct vg_context *ctx,
 197                                 enum vg_object_type type,
 198                                 void *ptr)
 199 {
 200     if (ctx) {
 201        struct cso_hash *hash = ctx->owned_objects[type];
 202        if (!hash)
 203           return VG_FALSE;
 204        return cso_hash_contains(hash, (unsigned)(long)ptr);
 205     }
 206     return VG_FALSE;
 207 }
 208
 209 void vg_context_add_object(struct vg_context *ctx,
 210                            enum vg_object_type type,
 211                            void *ptr)
 212 {
 213     if (ctx) {
 214        struct cso_hash *hash = ctx->owned_objects[type];
 215        if (!hash)
 216           return;
 217        cso_hash_insert(hash, (unsigned)(long)ptr, ptr);
 218     }
 219 }
 220
 221 void vg_context_remove_object(struct vg_context *ctx,
 222                               enum vg_object_type type,
 223                               void *ptr)
 224 {
 225    if (ctx) {
 226       struct cso_hash *hash = ctx->owned_objects[type];
 227       if (!hash)
 228          return;
 229       cso_hash_take(hash, (unsigned)(long)ptr);
 230    }
 231 }
 232
 233 static void update_clip_state(struct vg_context *ctx)
 234 {
 235    struct pipe_depth_stencil_alpha_state *dsa = &ctx->state.g3d.dsa;
 236    struct vg_state *state =  &ctx->state.vg;
 237
 238    memset(dsa, 0, sizeof(struct pipe_depth_stencil_alpha_state));
 239
 240    if (state->scissoring) {
 241       struct pipe_blend_state *blend = &ctx->state.g3d.blend;
 242       struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
 243       int i;
 244
 245       dsa->depth.writemask = 1;/*glDepthMask(TRUE);*/
 246       dsa->depth.func = PIPE_FUNC_ALWAYS;
 247       dsa->depth.enabled = 1;
 248
 249       cso_save_blend(ctx->cso_context);
 250       cso_save_fragment_shader(ctx->cso_context);
 251       /* set a passthrough shader */
 252       if (!ctx->pass_through_depth_fs)
 253          ctx->pass_through_depth_fs = shader_create_from_text(ctx->pipe,
 254                                                               pass_through_depth_asm,
 255                                                               40,
 256                                                               PIPE_SHADER_FRAGMENT);
 257       cso_set_fragment_shader_handle(ctx->cso_context,
 258                                      ctx->pass_through_depth_fs->driver);
 259       cso_set_depth_stencil_alpha(ctx->cso_context, dsa);
 260
 261       ctx->pipe->clear(ctx->pipe, PIPE_CLEAR_DEPTHSTENCIL, NULL, 1.0, 0);
 262
 263       /* disable color writes */
 264       blend->rt[0].colormask = 0; /*disable colorwrites*/
 265       cso_set_blend(ctx->cso_context, blend);
 266
 267       /* enable scissoring */
 268       for (i = 0; i < state->scissor_rects_num; ++i) {
 269          const float x      = state->scissor_rects[i * 4 + 0].f;
 270          const float y      = state->scissor_rects[i * 4 + 1].f;
 271          const float width  = state->scissor_rects[i * 4 + 2].f;
 272          const float height = state->scissor_rects[i * 4 + 3].f;
 273          VGfloat minx, miny, maxx, maxy;
 274
 275          minx = 0;
 276          miny = 0;
 277          maxx = fb->width;
 278          maxy = fb->height;
 279
 280          if (x > minx)
 281             minx = x;
 282          if (y > miny)
 283             miny = y;
 284
 285          if (x + width < maxx)
 286             maxx = x + width;
 287          if (y + height < maxy)
 288             maxy = y + height;
 289
 290          /* check for null space */
 291          if (minx >= maxx || miny >= maxy)
 292             minx = miny = maxx = maxy = 0;
 293
 294          /*glClear(GL_DEPTH_BUFFER_BIT);*/
 295          renderer_draw_quad(ctx->renderer, minx, miny, maxx, maxy, 0.0f);
 296       }
 297
 298       cso_restore_blend(ctx->cso_context);
 299       cso_restore_fragment_shader(ctx->cso_context);
 300
 301       dsa->depth.enabled = 1; /* glEnable(GL_DEPTH_TEST); */
 302       dsa->depth.writemask = 0;/*glDepthMask(FALSE);*/
 303       dsa->depth.func = PIPE_FUNC_GEQUAL;
 304    }
 305 }
 306
 307 void vg_validate_state(struct vg_context *ctx)
 308 {
 309    vg_manager_validate_framebuffer(ctx);
 310
 311    if ((ctx->state.dirty & BLEND_DIRTY)) {
 312       struct pipe_blend_state *blend = &ctx->state.g3d.blend;
 313       memset(blend, 0, sizeof(struct pipe_blend_state));
 314       blend->rt[0].blend_enable = 1;
 315       blend->rt[0].colormask = PIPE_MASK_RGBA;
 316
 317       switch (ctx->state.vg.blend_mode) {
 318       case VG_BLEND_SRC:
 319          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_ONE;
 320          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 321          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_ZERO;
 322          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 323          blend->rt[0].blend_enable = 0;
 324          break;
 325       case VG_BLEND_SRC_OVER:
 326          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_SRC_ALPHA;
 327          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 328          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_INV_SRC_ALPHA;
 329          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_INV_SRC_ALPHA;
 330          break;
 331       case VG_BLEND_DST_OVER:
 332          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_INV_DST_ALPHA;
 333          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_INV_DST_ALPHA;
 334          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_DST_ALPHA;
 335          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_DST_ALPHA;
 336          break;
 337       case VG_BLEND_SRC_IN:
 338          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_DST_ALPHA;
 339          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_DST_ALPHA;
 340          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_ZERO;
 341          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 342          break;
 343       case VG_BLEND_DST_IN:
 344          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_ZERO;
 345          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ZERO;
 346          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_SRC_ALPHA;
 347          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_SRC_ALPHA;
 348          break;
 349       case VG_BLEND_MULTIPLY:
 350       case VG_BLEND_SCREEN:
 351       case VG_BLEND_DARKEN:
 352       case VG_BLEND_LIGHTEN:
 353          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_ONE;
 354          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 355          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_ZERO;
 356          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 357          blend->rt[0].blend_enable = 0;
 358          break;
 359       case VG_BLEND_ADDITIVE:
 360          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_ONE;
 361          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 362          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_ONE;
 363          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
 364          break;
 365       default:
 366          assert(!"not implemented blend mode");
 367       }
 368       cso_set_blend(ctx->cso_context, &ctx->state.g3d.blend);
 369    }
 370    if ((ctx->state.dirty & RASTERIZER_DIRTY)) {
 371       struct pipe_rasterizer_state *raster = &ctx->state.g3d.rasterizer;
 372       memset(raster, 0, sizeof(struct pipe_rasterizer_state));
 373       raster->gl_rasterization_rules = 1;
 374       cso_set_rasterizer(ctx->cso_context, &ctx->state.g3d.rasterizer);
 375    }
 376    if ((ctx->state.dirty & VIEWPORT_DIRTY)) {
 377       struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
 378       const VGint param_bytes = 8 * sizeof(VGfloat);
 379       VGfloat vs_consts[8] = {
 380          2.f/fb->width, 2.f/fb->height, 1, 1,
 381          -1, -1, 0, 0
 382       };
 383       struct pipe_buffer **cbuf = &ctx->vs_const_buffer;
 384
 385       vg_set_viewport(ctx, VEGA_Y0_BOTTOM);
 386
 387       pipe_buffer_reference(cbuf, NULL);
 388       *cbuf = pipe_buffer_create(ctx->pipe->screen, 16,
 389                                         PIPE_BUFFER_USAGE_CONSTANT,
 390                                         param_bytes);
 391
 392       if (*cbuf) {
 393          st_no_flush_pipe_buffer_write(ctx, *cbuf,
 394                                        0, param_bytes, vs_consts);
 395       }
 396       ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_VERTEX, 0, *cbuf);
 397    }
 398    if ((ctx->state.dirty & VS_DIRTY)) {
 399       cso_set_vertex_shader_handle(ctx->cso_context,
 400                                    vg_plain_vs(ctx));
 401    }
 402
 403    /* must be last because it renders to the depth buffer*/
 404    if ((ctx->state.dirty & DEPTH_STENCIL_DIRTY)) {
 405       update_clip_state(ctx);
 406       cso_set_depth_stencil_alpha(ctx->cso_context, &ctx->state.g3d.dsa);
 407    }
 408
 409    shader_set_masking(ctx->shader, ctx->state.vg.masking);
 410    shader_set_image_mode(ctx->shader, ctx->state.vg.image_mode);
 411
 412    ctx->state.dirty = NONE_DIRTY;
 413 }
 414
 415 VGboolean vg_object_is_valid(void *ptr, enum vg_object_type type)
 416 {
 417    struct vg_object *obj = ptr;
 418    if (ptr && is_aligned(obj) && obj->type == type)
 419       return VG_TRUE;
 420    else
 421       return VG_FALSE;
 422 }
 423
 424 void vg_set_error(struct vg_context *ctx,
 425                   VGErrorCode code)
 426 {
 427    /*vgGetError returns the oldest error code provided by
 428     * an API call on the current context since the previous
 429     * call to vgGetError on that context (or since the creation
 430     of the context).*/
 431    if (ctx->_error == VG_NO_ERROR)
 432       ctx->_error = code;
 433 }
 434
 435 void vg_prepare_blend_surface(struct vg_context *ctx)
 436 {
 437    struct pipe_surface *dest_surface = NULL;
 438    struct pipe_context *pipe = ctx->pipe;
 439    struct st_framebuffer *stfb = ctx->draw_buffer;
 440    struct st_renderbuffer *strb = stfb->strb;
 441
 442    /* first finish all pending rendering */
 443    vgFinish();
 444
 445    dest_surface = pipe->screen->get_tex_surface(pipe->screen,
 446                                                 stfb->blend_texture,
 447                                                 0, 0, 0,
 448                                                 PIPE_BUFFER_USAGE_GPU_WRITE);
 449    /* flip it, because we want to use it as a sampler */
 450    util_blit_pixels_tex(ctx->blit,
 451                         strb->texture,
 452                         0, strb->height,
 453                         strb->width, 0,
 454                         dest_surface,
 455                         0, 0,
 456                         strb->width, strb->height,
 457                         0.0, PIPE_TEX_MIPFILTER_NEAREST);
 458
 459    if (dest_surface)
 460       pipe_surface_reference(&dest_surface, NULL);
 461
 462    /* make sure it's complete */
 463    vgFinish();
 464 }
 465
 466
 467 void vg_prepare_blend_surface_from_mask(struct vg_context *ctx)
 468 {
 469    struct pipe_surface *dest_surface = NULL;
 470    struct pipe_context *pipe = ctx->pipe;
 471    struct st_framebuffer *stfb = ctx->draw_buffer;
 472    struct st_renderbuffer *strb = stfb->strb;
 473
 474    vg_validate_state(ctx);
 475
 476    /* first finish all pending rendering */
 477    vgFinish();
 478
 479    dest_surface = pipe->screen->get_tex_surface(pipe->screen,
 480                                                 stfb->blend_texture,
 481                                                 0, 0, 0,
 482                                                 PIPE_BUFFER_USAGE_GPU_WRITE);
 483
 484    /* flip it, because we want to use it as a sampler */
 485    util_blit_pixels_tex(ctx->blit,
 486                         stfb->alpha_mask,
 487                         0, strb->height,
 488                         strb->width, 0,
 489                         dest_surface,
 490                         0, 0,
 491                         strb->width, strb->height,
 492                         0.0, PIPE_TEX_MIPFILTER_NEAREST);
 493
 494    /* make sure it's complete */
 495    vgFinish();
 496
 497    if (dest_surface)
 498       pipe_surface_reference(&dest_surface, NULL);
 499 }
 500
 501 void * vg_plain_vs(struct vg_context *ctx)
 502 {
 503    if (!ctx->plain_vs) {
 504       ctx->plain_vs = shader_create_from_text(ctx->pipe,
 505                                               vs_plain_asm,
 506                                               200,
 507                                               PIPE_SHADER_VERTEX);
 508    }
 509
 510    return ctx->plain_vs->driver;
 511 }
 512
 513
 514 void * vg_clear_vs(struct vg_context *ctx)
 515 {
 516    if (!ctx->clear_vs) {
 517       ctx->clear_vs = shader_create_from_text(ctx->pipe,
 518                                               vs_clear_asm,
 519                                               200,
 520                                               PIPE_SHADER_VERTEX);
 521    }
 522
 523    return ctx->clear_vs->driver;
 524 }
 525
 526 void * vg_texture_vs(struct vg_context *ctx)
 527 {
 528    if (!ctx->texture_vs) {
 529       ctx->texture_vs = shader_create_from_text(ctx->pipe,
 530                                                 vs_texture_asm,
 531                                                 200,
 532                                                 PIPE_SHADER_VERTEX);
 533    }
 534
 535    return ctx->texture_vs->driver;
 536 }
 537
 538 void vg_set_viewport(struct vg_context *ctx, VegaOrientation orientation)
 539 {
 540    struct pipe_viewport_state viewport;
 541    struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
 542    VGfloat y_scale = (orientation == VEGA_Y0_BOTTOM) ? -2.f : 2.f;
 543
 544    viewport.scale[0] =  fb->width / 2.f;
 545    viewport.scale[1] =  fb->height / y_scale;
 546    viewport.scale[2] =  1.0;
 547    viewport.scale[3] =  1.0;
 548    viewport.translate[0] = fb->width / 2.f;
 549    viewport.translate[1] = fb->height / 2.f;
 550    viewport.translate[2] = 0.0;
 551    viewport.translate[3] = 0.0;
 552
 553    cso_set_viewport(ctx->cso_context, &viewport);
 554 }