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,
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  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 #include "util/u_sampler.h"
  47
  48 struct vg_context *_vg_context = 0;
  49
  50 struct vg_context * vg_current_context(void)
  51 {
  52    return _vg_context;
  53 }
  54
  55 static void init_clear(struct vg_context *st)
  56 {
  57    struct pipe_context *pipe = st->pipe;
  58
  59    /* rasterizer state: bypass clipping */
  60    memset(&st->clear.raster, 0, sizeof(st->clear.raster));
  61    st->clear.raster.gl_rasterization_rules = 1;
  62
  63    /* fragment shader state: color pass-through program */
  64    st->clear.fs =
  65       util_make_fragment_passthrough_shader(pipe);
  66 }
  67 void vg_set_current_context(struct vg_context *ctx)
  68 {
  69    _vg_context = ctx;
  70 }
  71
  72 struct vg_context * vg_create_context(struct pipe_context *pipe,
  73                                       const void *visual,
  74                                       struct vg_context *share)
  75 {
  76    struct vg_context *ctx;
  77    unsigned i;
  78
  79    ctx = CALLOC_STRUCT(vg_context);
  80
  81    ctx->pipe = pipe;
  82
  83    vg_init_state(&ctx->state.vg);
  84    ctx->state.dirty = ALL_DIRTY;
  85
  86    ctx->cso_context = cso_create_context(pipe);
  87
  88    init_clear(ctx);
  89
  90    ctx->default_paint = paint_create(ctx);
  91    ctx->state.vg.stroke_paint = ctx->default_paint;
  92    ctx->state.vg.fill_paint = ctx->default_paint;
  93
  94
  95    ctx->mask.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  96    ctx->mask.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  97    ctx->mask.sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
  98    ctx->mask.sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
  99    ctx->mask.sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 100    ctx->mask.sampler.normalized_coords = 0;
 101
 102    ctx->blend_sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 103    ctx->blend_sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 104    ctx->blend_sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 105    ctx->blend_sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 106    ctx->blend_sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 107    ctx->blend_sampler.normalized_coords = 0;
 108
 109    for (i = 0; i < 2; i++) {
 110       ctx->velems[i].src_offset = i * 4 * sizeof(float);
 111       ctx->velems[i].instance_divisor = 0;
 112       ctx->velems[i].vertex_buffer_index = 0;
 113       ctx->velems[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 114    }
 115
 116    vg_set_error(ctx, VG_NO_ERROR);
 117
 118    ctx->owned_objects[VG_OBJECT_PAINT] = cso_hash_create();
 119    ctx->owned_objects[VG_OBJECT_IMAGE] = cso_hash_create();
 120    ctx->owned_objects[VG_OBJECT_MASK] = cso_hash_create();
 121    ctx->owned_objects[VG_OBJECT_FONT] = cso_hash_create();
 122    ctx->owned_objects[VG_OBJECT_PATH] = cso_hash_create();
 123
 124    ctx->renderer = renderer_create(ctx);
 125    ctx->sc = shaders_cache_create(ctx);
 126    ctx->shader = shader_create(ctx);
 127
 128    ctx->blit = util_create_blit(ctx->pipe, ctx->cso_context);
 129
 130    return ctx;
 131 }
 132
 133 void vg_destroy_context(struct vg_context *ctx)
 134 {
 135    struct pipe_buffer **cbuf = &ctx->mask.cbuf;
 136    struct pipe_buffer **vsbuf = &ctx->vs_const_buffer;
 137
 138    util_destroy_blit(ctx->blit);
 139    renderer_destroy(ctx->renderer);
 140    shaders_cache_destroy(ctx->sc);
 141    shader_destroy(ctx->shader);
 142    paint_destroy(ctx->default_paint);
 143
 144    if (*cbuf)
 145       pipe_buffer_reference(cbuf, NULL);
 146
 147    if (*vsbuf)
 148       pipe_buffer_reference(vsbuf, NULL);
 149
 150    if (ctx->clear.fs) {
 151       cso_delete_fragment_shader(ctx->cso_context, ctx->clear.fs);
 152       ctx->clear.fs = NULL;
 153    }
 154
 155    if (ctx->plain_vs) {
 156       vg_shader_destroy(ctx, ctx->plain_vs);
 157       ctx->plain_vs = NULL;
 158    }
 159    if (ctx->clear_vs) {
 160       vg_shader_destroy(ctx, ctx->clear_vs);
 161       ctx->clear_vs = NULL;
 162    }
 163    if (ctx->texture_vs) {
 164       vg_shader_destroy(ctx, ctx->texture_vs);
 165       ctx->texture_vs = NULL;
 166    }
 167
 168    if (ctx->pass_through_depth_fs)
 169       vg_shader_destroy(ctx, ctx->pass_through_depth_fs);
 170    if (ctx->mask.union_fs)
 171       vg_shader_destroy(ctx, ctx->mask.union_fs);
 172    if (ctx->mask.intersect_fs)
 173       vg_shader_destroy(ctx, ctx->mask.intersect_fs);
 174    if (ctx->mask.subtract_fs)
 175       vg_shader_destroy(ctx, ctx->mask.subtract_fs);
 176    if (ctx->mask.set_fs)
 177       vg_shader_destroy(ctx, ctx->mask.set_fs);
 178
 179    cso_release_all(ctx->cso_context);
 180    cso_destroy_context(ctx->cso_context);
 181
 182    cso_hash_delete(ctx->owned_objects[VG_OBJECT_PAINT]);
 183    cso_hash_delete(ctx->owned_objects[VG_OBJECT_IMAGE]);
 184    cso_hash_delete(ctx->owned_objects[VG_OBJECT_MASK]);
 185    cso_hash_delete(ctx->owned_objects[VG_OBJECT_FONT]);
 186    cso_hash_delete(ctx->owned_objects[VG_OBJECT_PATH]);
 187
 188    free(ctx);
 189 }
 190
 191 void vg_init_object(struct vg_object *obj, struct vg_context *ctx, enum vg_object_type type)
 192 {
 193    obj->type = type;
 194    obj->ctx = ctx;
 195 }
 196
 197 VGboolean vg_context_is_object_valid(struct vg_context *ctx,
 198                                 enum vg_object_type type,
 199                                 void *ptr)
 200 {
 201     if (ctx) {
 202        struct cso_hash *hash = ctx->owned_objects[type];
 203        if (!hash)
 204           return VG_FALSE;
 205        return cso_hash_contains(hash, (unsigned)(long)ptr);
 206     }
 207     return VG_FALSE;
 208 }
 209
 210 void vg_context_add_object(struct vg_context *ctx,
 211                            enum vg_object_type type,
 212                            void *ptr)
 213 {
 214     if (ctx) {
 215        struct cso_hash *hash = ctx->owned_objects[type];
 216        if (!hash)
 217           return;
 218        cso_hash_insert(hash, (unsigned)(long)ptr, ptr);
 219     }
 220 }
 221
 222 void vg_context_remove_object(struct vg_context *ctx,
 223                               enum vg_object_type type,
 224                               void *ptr)
 225 {
 226    if (ctx) {
 227       struct cso_hash *hash = ctx->owned_objects[type];
 228       if (!hash)
 229          return;
 230       cso_hash_take(hash, (unsigned)(long)ptr);
 231    }
 232 }
 233
 234 static void update_clip_state(struct vg_context *ctx)
 235 {
 236    struct pipe_depth_stencil_alpha_state *dsa = &ctx->state.g3d.dsa;
 237    struct vg_state *state =  &ctx->state.vg;
 238
 239    memset(dsa, 0, sizeof(struct pipe_depth_stencil_alpha_state));
 240
 241    if (state->scissoring) {
 242       struct pipe_blend_state *blend = &ctx->state.g3d.blend;
 243       struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
 244       int i;
 245
 246       dsa->depth.writemask = 1;/*glDepthMask(TRUE);*/
 247       dsa->depth.func = PIPE_FUNC_ALWAYS;
 248       dsa->depth.enabled = 1;
 249
 250       cso_save_blend(ctx->cso_context);
 251       cso_save_fragment_shader(ctx->cso_context);
 252       /* set a passthrough shader */
 253       if (!ctx->pass_through_depth_fs)
 254          ctx->pass_through_depth_fs = shader_create_from_text(ctx->pipe,
 255                                                               pass_through_depth_asm,
 256                                                               40,
 257                                                               PIPE_SHADER_FRAGMENT);
 258       cso_set_fragment_shader_handle(ctx->cso_context,
 259                                      ctx->pass_through_depth_fs->driver);
 260       cso_set_depth_stencil_alpha(ctx->cso_context, dsa);
 261
 262       ctx->pipe->clear(ctx->pipe, PIPE_CLEAR_DEPTHSTENCIL, NULL, 1.0, 0);
 263
 264       /* disable color writes */
 265       blend->rt[0].colormask = 0; /*disable colorwrites*/
 266       cso_set_blend(ctx->cso_context, blend);
 267
 268       /* enable scissoring */
 269       for (i = 0; i < state->scissor_rects_num; ++i) {
 270          const float x      = state->scissor_rects[i * 4 + 0].f;
 271          const float y      = state->scissor_rects[i * 4 + 1].f;
 272          const float width  = state->scissor_rects[i * 4 + 2].f;
 273          const float height = state->scissor_rects[i * 4 + 3].f;
 274          VGfloat minx, miny, maxx, maxy;
 275
 276          minx = 0;
 277          miny = 0;
 278          maxx = fb->width;
 279          maxy = fb->height;
 280
 281          if (x > minx)
 282             minx = x;
 283          if (y > miny)
 284             miny = y;
 285
 286          if (x + width < maxx)
 287             maxx = x + width;
 288          if (y + height < maxy)
 289             maxy = y + height;
 290
 291          /* check for null space */
 292          if (minx >= maxx || miny >= maxy)
 293             minx = miny = maxx = maxy = 0;
 294
 295          /*glClear(GL_DEPTH_BUFFER_BIT);*/
 296          renderer_draw_quad(ctx->renderer, minx, miny, maxx, maxy, 0.0f);
 297       }
 298
 299       cso_restore_blend(ctx->cso_context);
 300       cso_restore_fragment_shader(ctx->cso_context);
 301
 302       dsa->depth.enabled = 1; /* glEnable(GL_DEPTH_TEST); */
 303       dsa->depth.writemask = 0;/*glDepthMask(FALSE);*/
 304       dsa->depth.func = PIPE_FUNC_GEQUAL;
 305    }
 306 }
 307
 308 void vg_validate_state(struct vg_context *ctx)
 309 {
 310    vg_manager_validate_framebuffer(ctx);
 311
 312    if ((ctx->state.dirty & BLEND_DIRTY)) {
 313       struct pipe_blend_state *blend = &ctx->state.g3d.blend;
 314       memset(blend, 0, sizeof(struct pipe_blend_state));
 315       blend->rt[0].blend_enable = 1;
 316       blend->rt[0].colormask = PIPE_MASK_RGBA;
 317
 318       switch (ctx->state.vg.blend_mode) {
 319       case VG_BLEND_SRC:
 320          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_ONE;
 321          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 322          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_ZERO;
 323          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 324          blend->rt[0].blend_enable = 0;
 325          break;
 326       case VG_BLEND_SRC_OVER:
 327          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_SRC_ALPHA;
 328          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 329          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_INV_SRC_ALPHA;
 330          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_INV_SRC_ALPHA;
 331          break;
 332       case VG_BLEND_DST_OVER:
 333          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_INV_DST_ALPHA;
 334          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_INV_DST_ALPHA;
 335          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_DST_ALPHA;
 336          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_DST_ALPHA;
 337          break;
 338       case VG_BLEND_SRC_IN:
 339          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_DST_ALPHA;
 340          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_DST_ALPHA;
 341          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_ZERO;
 342          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 343          break;
 344       case VG_BLEND_DST_IN:
 345          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_ZERO;
 346          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ZERO;
 347          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_SRC_ALPHA;
 348          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_SRC_ALPHA;
 349          break;
 350       case VG_BLEND_MULTIPLY:
 351       case VG_BLEND_SCREEN:
 352       case VG_BLEND_DARKEN:
 353       case VG_BLEND_LIGHTEN:
 354          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_ONE;
 355          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 356          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_ZERO;
 357          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 358          blend->rt[0].blend_enable = 0;
 359          break;
 360       case VG_BLEND_ADDITIVE:
 361          blend->rt[0].rgb_src_factor   = PIPE_BLENDFACTOR_ONE;
 362          blend->rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 363          blend->rt[0].rgb_dst_factor   = PIPE_BLENDFACTOR_ONE;
 364          blend->rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
 365          break;
 366       default:
 367          assert(!"not implemented blend mode");
 368       }
 369       cso_set_blend(ctx->cso_context, &ctx->state.g3d.blend);
 370    }
 371    if ((ctx->state.dirty & RASTERIZER_DIRTY)) {
 372       struct pipe_rasterizer_state *raster = &ctx->state.g3d.rasterizer;
 373       memset(raster, 0, sizeof(struct pipe_rasterizer_state));
 374       raster->gl_rasterization_rules = 1;
 375       cso_set_rasterizer(ctx->cso_context, &ctx->state.g3d.rasterizer);
 376    }
 377    if ((ctx->state.dirty & VIEWPORT_DIRTY)) {
 378       struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
 379       const VGint param_bytes = 8 * sizeof(VGfloat);
 380       VGfloat vs_consts[8] = {
 381          2.f/fb->width, 2.f/fb->height, 1, 1,
 382          -1, -1, 0, 0
 383       };
 384       struct pipe_buffer **cbuf = &ctx->vs_const_buffer;
 385
 386       vg_set_viewport(ctx, VEGA_Y0_BOTTOM);
 387
 388       pipe_buffer_reference(cbuf, NULL);
 389       *cbuf = pipe_buffer_create(ctx->pipe->screen, 16,
 390                                         PIPE_BUFFER_USAGE_CONSTANT,
 391                                         param_bytes);
 392
 393       if (*cbuf) {
 394          st_no_flush_pipe_buffer_write(ctx, *cbuf,
 395                                        0, param_bytes, vs_consts);
 396       }
 397       ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_VERTEX, 0, *cbuf);
 398    }
 399    if ((ctx->state.dirty & VS_DIRTY)) {
 400       cso_set_vertex_shader_handle(ctx->cso_context,
 401                                    vg_plain_vs(ctx));
 402    }
 403
 404    /* must be last because it renders to the depth buffer*/
 405    if ((ctx->state.dirty & DEPTH_STENCIL_DIRTY)) {
 406       update_clip_state(ctx);
 407       cso_set_depth_stencil_alpha(ctx->cso_context, &ctx->state.g3d.dsa);
 408    }
 409
 410    shader_set_masking(ctx->shader, ctx->state.vg.masking);
 411    shader_set_image_mode(ctx->shader, ctx->state.vg.image_mode);
 412
 413    ctx->state.dirty = NONE_DIRTY;
 414 }
 415
 416 VGboolean vg_object_is_valid(void *ptr, enum vg_object_type type)
 417 {
 418    struct vg_object *obj = ptr;
 419    if (ptr && is_aligned(obj) && obj->type == type)
 420       return VG_TRUE;
 421    else
 422       return VG_FALSE;
 423 }
 424
 425 void vg_set_error(struct vg_context *ctx,
 426                   VGErrorCode code)
 427 {
 428    /*vgGetError returns the oldest error code provided by
 429     * an API call on the current context since the previous
 430     * call to vgGetError on that context (or since the creation
 431     of the context).*/
 432    if (ctx->_error == VG_NO_ERROR)
 433       ctx->_error = code;
 434 }
 435
 436 void vg_prepare_blend_surface(struct vg_context *ctx)
 437 {
 438    struct pipe_surface *dest_surface = NULL;
 439    struct pipe_context *pipe = ctx->pipe;
 440    struct pipe_sampler_view *view;
 441    struct pipe_sampler_view view_templ;
 442    struct st_framebuffer *stfb = ctx->draw_buffer;
 443    struct st_renderbuffer *strb = stfb->strb;
 444
 445    /* first finish all pending rendering */
 446    vgFinish();
 447
 448    u_sampler_view_default_template(&view_templ, strb->texture, strb->texture->format);
 449    view = pipe->create_sampler_view(pipe, strb->texture, &view_templ);
 450
 451    dest_surface = pipe->screen->get_tex_surface(pipe->screen,
 452                                                 stfb->blend_texture_view->texture,
 453                                                 0, 0, 0,
 454                                                 PIPE_BUFFER_USAGE_GPU_WRITE);
 455    /* flip it, because we want to use it as a sampler */
 456    util_blit_pixels_tex(ctx->blit,
 457                         view,
 458                         0, strb->height,
 459                         strb->width, 0,
 460                         dest_surface,
 461                         0, 0,
 462                         strb->width, strb->height,
 463                         0.0, PIPE_TEX_MIPFILTER_NEAREST);
 464
 465    if (dest_surface)
 466       pipe_surface_reference(&dest_surface, NULL);
 467
 468    /* make sure it's complete */
 469    vgFinish();
 470
 471    pipe_sampler_view_reference(&view, NULL);
 472 }
 473
 474
 475 void vg_prepare_blend_surface_from_mask(struct vg_context *ctx)
 476 {
 477    struct pipe_surface *dest_surface = NULL;
 478    struct pipe_context *pipe = ctx->pipe;
 479    struct st_framebuffer *stfb = ctx->draw_buffer;
 480    struct st_renderbuffer *strb = stfb->strb;
 481
 482    vg_validate_state(ctx);
 483
 484    /* first finish all pending rendering */
 485    vgFinish();
 486
 487    dest_surface = pipe->screen->get_tex_surface(pipe->screen,
 488                                                 stfb->blend_texture_view->texture,
 489                                                 0, 0, 0,
 490                                                 PIPE_BUFFER_USAGE_GPU_WRITE);
 491
 492    /* flip it, because we want to use it as a sampler */
 493    util_blit_pixels_tex(ctx->blit,
 494                         stfb->alpha_mask_view,
 495                         0, strb->height,
 496                         strb->width, 0,
 497                         dest_surface,
 498                         0, 0,
 499                         strb->width, strb->height,
 500                         0.0, PIPE_TEX_MIPFILTER_NEAREST);
 501
 502    /* make sure it's complete */
 503    vgFinish();
 504
 505    if (dest_surface)
 506       pipe_surface_reference(&dest_surface, NULL);
 507 }
 508
 509 void * vg_plain_vs(struct vg_context *ctx)
 510 {
 511    if (!ctx->plain_vs) {
 512       ctx->plain_vs = shader_create_from_text(ctx->pipe,
 513                                               vs_plain_asm,
 514                                               200,
 515                                               PIPE_SHADER_VERTEX);
 516    }
 517
 518    return ctx->plain_vs->driver;
 519 }
 520
 521
 522 void * vg_clear_vs(struct vg_context *ctx)
 523 {
 524    if (!ctx->clear_vs) {
 525       ctx->clear_vs = shader_create_from_text(ctx->pipe,
 526                                               vs_clear_asm,
 527                                               200,
 528                                               PIPE_SHADER_VERTEX);
 529    }
 530
 531    return ctx->clear_vs->driver;
 532 }
 533
 534 void * vg_texture_vs(struct vg_context *ctx)
 535 {
 536    if (!ctx->texture_vs) {
 537       ctx->texture_vs = shader_create_from_text(ctx->pipe,
 538                                                 vs_texture_asm,
 539                                                 200,
 540                                                 PIPE_SHADER_VERTEX);
 541    }
 542
 543    return ctx->texture_vs->driver;
 544 }
 545
 546 void vg_set_viewport(struct vg_context *ctx, VegaOrientation orientation)
 547 {
 548    struct pipe_viewport_state viewport;
 549    struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
 550    VGfloat y_scale = (orientation == VEGA_Y0_BOTTOM) ? -2.f : 2.f;
 551
 552    viewport.scale[0] =  fb->width / 2.f;
 553    viewport.scale[1] =  fb->height / y_scale;
 554    viewport.scale[2] =  1.0;
 555    viewport.scale[3] =  1.0;
 556    viewport.translate[0] = fb->width / 2.f;
 557    viewport.translate[1] = fb->height / 2.f;
 558    viewport.translate[2] = 0.0;
 559    viewport.translate[3] = 0.0;
 560
 561    cso_set_viewport(ctx->cso_context, &viewport);
 562 }