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