src/gallium/drivers/r300/r300_blit.c

   1 /*
   2  * Copyright 2009 Marek Olšák <maraeo@gmail.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  22
  23 #include "r300_context.h"
  24 #include "r300_emit.h"
  25 #include "r300_texture.h"
  26
  27 #include "util/u_format.h"
  28 #include "util/u_pack_color.h"
  29 #include "util/u_surface.h"
  30
  31 enum r300_blitter_op /* bitmask */
  32 {
  33     R300_STOP_QUERY         = 1,
  34     R300_SAVE_TEXTURES      = 2,
  35     R300_SAVE_FRAMEBUFFER   = 4,
  36     R300_IGNORE_RENDER_COND = 8,
  37
  38     R300_CLEAR         = R300_STOP_QUERY,
  39
  40     R300_CLEAR_SURFACE = R300_STOP_QUERY | R300_SAVE_FRAMEBUFFER,
  41
  42     R300_COPY          = R300_STOP_QUERY | R300_SAVE_FRAMEBUFFER |
  43                          R300_SAVE_TEXTURES | R300_IGNORE_RENDER_COND,
  44
  45     R300_DECOMPRESS    = R300_STOP_QUERY | R300_IGNORE_RENDER_COND,
  46 };
  47
  48 static void r300_blitter_begin(struct r300_context* r300, enum r300_blitter_op op)
  49 {
  50     if ((op & R300_STOP_QUERY) && r300->query_current) {
  51         r300->blitter_saved_query = r300->query_current;
  52         r300_stop_query(r300);
  53     }
  54
  55     /* Yeah we have to save all those states to ensure the blitter operation
  56      * is really transparent. The states will be restored by the blitter once
  57      * copying is done. */
  58     util_blitter_save_blend(r300->blitter, r300->blend_state.state);
  59     util_blitter_save_depth_stencil_alpha(r300->blitter, r300->dsa_state.state);
  60     util_blitter_save_stencil_ref(r300->blitter, &(r300->stencil_ref));
  61     util_blitter_save_rasterizer(r300->blitter, r300->rs_state.state);
  62     util_blitter_save_fragment_shader(r300->blitter, r300->fs.state);
  63     util_blitter_save_vertex_shader(r300->blitter, r300->vs_state.state);
  64     util_blitter_save_viewport(r300->blitter, &r300->viewport);
  65     if (r300->vbuf_mgr) {
  66         util_blitter_save_vertex_buffers(r300->blitter, r300->vbuf_mgr->nr_vertex_buffers,
  67                                          r300->vbuf_mgr->vertex_buffer);
  68         util_blitter_save_vertex_elements(r300->blitter, r300->vbuf_mgr->vertex_elements);
  69     } else {
  70         util_blitter_save_vertex_buffers(r300->blitter, r300->nr_vertex_buffers,
  71                                          r300->vertex_buffer);
  72         util_blitter_save_vertex_elements(r300->blitter, r300->velems);
  73     }
  74
  75     if (op & R300_SAVE_FRAMEBUFFER) {
  76         util_blitter_save_framebuffer(r300->blitter, r300->fb_state.state);
  77     }
  78
  79     if (op & R300_SAVE_TEXTURES) {
  80         struct r300_textures_state* state =
  81             (struct r300_textures_state*)r300->textures_state.state;
  82
  83         util_blitter_save_fragment_sampler_states(
  84             r300->blitter, state->sampler_state_count,
  85             (void**)state->sampler_states);
  86
  87         util_blitter_save_fragment_sampler_views(
  88             r300->blitter, state->sampler_view_count,
  89             (struct pipe_sampler_view**)state->sampler_views);
  90     }
  91
  92     if (op & R300_IGNORE_RENDER_COND) {
  93         /* Save the flag. */
  94         r300->blitter_saved_skip_rendering = r300->skip_rendering+1;
  95         r300->skip_rendering = FALSE;
  96     } else {
  97         r300->blitter_saved_skip_rendering = 0;
  98     }
  99 }
 100
 101 static void r300_blitter_end(struct r300_context *r300)
 102 {
 103     if (r300->blitter_saved_query) {
 104         r300_resume_query(r300, r300->blitter_saved_query);
 105         r300->blitter_saved_query = NULL;
 106     }
 107
 108     if (r300->blitter_saved_skip_rendering) {
 109         /* Restore the flag. */
 110         r300->skip_rendering = r300->blitter_saved_skip_rendering-1;
 111     }
 112 }
 113
 114 static uint32_t r300_depth_clear_cb_value(enum pipe_format format,
 115                                           const float* rgba)
 116 {
 117     union util_color uc;
 118     util_pack_color(rgba, format, &uc);
 119
 120     if (util_format_get_blocksizebits(format) == 32)
 121         return uc.ui;
 122     else
 123         return uc.us | (uc.us << 16);
 124 }
 125
 126 static boolean r300_cbzb_clear_allowed(struct r300_context *r300,
 127                                        unsigned clear_buffers)
 128 {
 129     struct pipe_framebuffer_state *fb =
 130         (struct pipe_framebuffer_state*)r300->fb_state.state;
 131
 132     /* Only color clear allowed, and only one colorbuffer. */
 133     if (clear_buffers != PIPE_CLEAR_COLOR || fb->nr_cbufs != 1)
 134         return FALSE;
 135
 136     return r300_surface(fb->cbufs[0])->cbzb_allowed;
 137 }
 138
 139 static boolean r300_fast_zclear_allowed(struct r300_context *r300)
 140 {
 141     struct pipe_framebuffer_state *fb =
 142         (struct pipe_framebuffer_state*)r300->fb_state.state;
 143
 144     return r300_resource(fb->zsbuf->texture)->tex.zmask_dwords[fb->zsbuf->u.tex.level] != 0;
 145 }
 146
 147 static boolean r300_hiz_clear_allowed(struct r300_context *r300)
 148 {
 149     struct pipe_framebuffer_state *fb =
 150         (struct pipe_framebuffer_state*)r300->fb_state.state;
 151
 152     return r300_resource(fb->zsbuf->texture)->tex.hiz_dwords[fb->zsbuf->u.tex.level] != 0;
 153 }
 154
 155 static uint32_t r300_depth_clear_value(enum pipe_format format,
 156                                        double depth, unsigned stencil)
 157 {
 158     switch (format) {
 159         case PIPE_FORMAT_Z16_UNORM:
 160         case PIPE_FORMAT_X8Z24_UNORM:
 161             return util_pack_z(format, depth);
 162
 163         case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 164             return util_pack_z_stencil(format, depth, stencil);
 165
 166         default:
 167             assert(0);
 168             return 0;
 169     }
 170 }
 171
 172 static uint32_t r300_hiz_clear_value(double depth)
 173 {
 174     uint32_t r = (uint32_t)(CLAMP(depth, 0, 1) * 255.5);
 175     assert(r <= 255);
 176     return r | (r << 8) | (r << 16) | (r << 24);
 177 }
 178
 179 /* Clear currently bound buffers. */
 180 static void r300_clear(struct pipe_context* pipe,
 181                        unsigned buffers,
 182                        const union pipe_color_union *color,
 183                        double depth,
 184                        unsigned stencil)
 185 {
 186     /* My notes about Zbuffer compression:
 187      *
 188      * 1) The zbuffer must be micro-tiled and whole microtiles must be
 189      *    written if compression is enabled. If microtiling is disabled,
 190      *    it locks up.
 191      *
 192      * 2) There is ZMASK RAM which contains a compressed zbuffer.
 193      *    Each dword of the Z Mask contains compression information
 194      *    for 16 4x4 pixel tiles, that is 2 bits for each tile.
 195      *    On chips with 2 Z pipes, every other dword maps to a different
 196      *    pipe. On newer chipsets, there is a new compression mode
 197      *    with 8x8 pixel tiles per 2 bits.
 198      *
 199      * 3) The FASTFILL bit has nothing to do with filling. It only tells hw
 200      *    it should look in the ZMASK RAM first before fetching from a real
 201      *    zbuffer.
 202      *
 203      * 4) If a pixel is in a cleared state, ZB_DEPTHCLEARVALUE is returned
 204      *    during zbuffer reads instead of the value that is actually stored
 205      *    in the zbuffer memory. A pixel is in a cleared state when its ZMASK
 206      *    is equal to 0. Therefore, if you clear ZMASK with zeros, you may
 207      *    leave the zbuffer memory uninitialized, but then you must enable
 208      *    compression, so that the ZMASK RAM is actually used.
 209      *
 210      * 5) Each 4x4 (or 8x8) tile is automatically decompressed and recompressed
 211      *    during zbuffer updates. A special decompressing operation should be
 212      *    used to fully decompress a zbuffer, which basically just stores all
 213      *    compressed tiles in ZMASK to the zbuffer memory.
 214      *
 215      * 6) For a 16-bit zbuffer, compression causes a hung with one or
 216      *    two samples and should not be used.
 217      *
 218      * 7) FORCE_COMPRESSED_STENCIL_VALUE should be enabled for stencil clears
 219      *    to avoid needless decompression.
 220      *
 221      * 8) Fastfill must not be used if reading of compressed Z data is disabled
 222      *    and writing of compressed Z data is enabled (RD/WR_COMP_ENABLE),
 223      *    i.e. it cannot be used to compress the zbuffer.
 224      *
 225      * 9) ZB_CB_CLEAR does not interact with zbuffer compression in any way.
 226      *
 227      * - Marek
 228      */
 229
 230     struct r300_context* r300 = r300_context(pipe);
 231     struct pipe_framebuffer_state *fb =
 232         (struct pipe_framebuffer_state*)r300->fb_state.state;
 233     struct r300_hyperz_state *hyperz =
 234         (struct r300_hyperz_state*)r300->hyperz_state.state;
 235     uint32_t width = fb->width;
 236     uint32_t height = fb->height;
 237     uint32_t hyperz_dcv = hyperz->zb_depthclearvalue;
 238
 239     /* Enable fast Z clear.
 240      * The zbuffer must be in micro-tiled mode, otherwise it locks up. */
 241     if (buffers & PIPE_CLEAR_DEPTHSTENCIL) {
 242         boolean zmask_clear, hiz_clear;
 243
 244         zmask_clear = r300_fast_zclear_allowed(r300);
 245         hiz_clear = r300_hiz_clear_allowed(r300);
 246
 247         /* If we need Hyper-Z. */
 248         if (zmask_clear || hiz_clear) {
 249             r300->num_z_clears++;
 250
 251             /* Try to obtain the access to Hyper-Z buffers if we don't have one. */
 252             if (!r300->hyperz_enabled) {
 253                 r300->hyperz_enabled =
 254                     r300->rws->cs_request_feature(r300->cs,
 255                                                 RADEON_FID_R300_HYPERZ_ACCESS,
 256                                                 TRUE);
 257                 if (r300->hyperz_enabled) {
 258                    /* Need to emit HyperZ buffer regs for the first time. */
 259                    r300_mark_fb_state_dirty(r300, R300_CHANGED_HYPERZ_FLAG);
 260                 }
 261             }
 262
 263             /* Setup Hyper-Z clears. */
 264             if (r300->hyperz_enabled) {
 265                 DBG(r300, DBG_HYPERZ, "r300: Clear memory: %s%s\n",
 266                     zmask_clear ? "ZMASK " : "", hiz_clear ? "HIZ" : "");
 267
 268                 if (zmask_clear) {
 269                     hyperz_dcv = hyperz->zb_depthclearvalue =
 270                         r300_depth_clear_value(fb->zsbuf->format, depth, stencil);
 271
 272                     r300_mark_atom_dirty(r300, &r300->zmask_clear);
 273                     buffers &= ~PIPE_CLEAR_DEPTHSTENCIL;
 274                 }
 275
 276                 if (hiz_clear) {
 277                     r300->hiz_clear_value = r300_hiz_clear_value(depth);
 278                     r300_mark_atom_dirty(r300, &r300->hiz_clear);
 279                 }
 280             }
 281         }
 282     }
 283
 284     /* Enable CBZB clear. */
 285     if (r300_cbzb_clear_allowed(r300, buffers)) {
 286         struct r300_surface *surf = r300_surface(fb->cbufs[0]);
 287
 288         hyperz->zb_depthclearvalue =
 289                 r300_depth_clear_cb_value(surf->base.format, color->f);
 290
 291         width = surf->cbzb_width;
 292         height = surf->cbzb_height;
 293
 294         r300->cbzb_clear = TRUE;
 295         r300_mark_fb_state_dirty(r300, R300_CHANGED_HYPERZ_FLAG);
 296     }
 297
 298     /* Clear. */
 299     if (buffers) {
 300         enum pipe_format cformat = fb->nr_cbufs ? fb->cbufs[0]->format : PIPE_FORMAT_NONE;
 301         /* Clear using the blitter. */
 302         r300_blitter_begin(r300, R300_CLEAR);
 303         util_blitter_clear(r300->blitter,
 304                            width,
 305                            height,
 306                            fb->nr_cbufs,
 307                            buffers, cformat, color, depth, stencil);
 308         r300_blitter_end(r300);
 309     } else if (r300->zmask_clear.dirty || r300->hiz_clear.dirty) {
 310         /* Just clear zmask and hiz now, this does not use the standard draw
 311          * procedure. */
 312         /* Calculate zmask_clear and hiz_clear atom sizes. */
 313         unsigned dwords =
 314             (r300->zmask_clear.dirty ? r300->zmask_clear.size : 0) +
 315             (r300->hiz_clear.dirty ? r300->hiz_clear.size : 0) +
 316             r300_get_num_cs_end_dwords(r300);
 317
 318         /* Reserve CS space. */
 319         if (dwords > (RADEON_MAX_CMDBUF_DWORDS - r300->cs->cdw)) {
 320             r300_flush(&r300->context, RADEON_FLUSH_ASYNC, NULL);
 321         }
 322
 323         /* Emit clear packets. */
 324         if (r300->zmask_clear.dirty) {
 325             r300_emit_zmask_clear(r300, r300->zmask_clear.size,
 326                                   r300->zmask_clear.state);
 327             r300->zmask_clear.dirty = FALSE;
 328         }
 329         if (r300->hiz_clear.dirty) {
 330             r300_emit_hiz_clear(r300, r300->hiz_clear.size,
 331                                 r300->hiz_clear.state);
 332             r300->hiz_clear.dirty = FALSE;
 333         }
 334     } else {
 335         assert(0);
 336     }
 337
 338     /* Disable CBZB clear. */
 339     if (r300->cbzb_clear) {
 340         r300->cbzb_clear = FALSE;
 341         hyperz->zb_depthclearvalue = hyperz_dcv;
 342         r300_mark_fb_state_dirty(r300, R300_CHANGED_HYPERZ_FLAG);
 343     }
 344
 345     /* Enable fastfill and/or hiz.
 346      *
 347      * If we cleared zmask/hiz, it's in use now. The Hyper-Z state update
 348      * looks if zmask/hiz is in use and programs hardware accordingly. */
 349     if (r300->zmask_in_use || r300->hiz_in_use) {
 350         r300_mark_atom_dirty(r300, &r300->hyperz_state);
 351     }
 352 }
 353
 354 /* Clear a region of a color surface to a constant value. */
 355 static void r300_clear_render_target(struct pipe_context *pipe,
 356                                      struct pipe_surface *dst,
 357                                      const union pipe_color_union *color,
 358                                      unsigned dstx, unsigned dsty,
 359                                      unsigned width, unsigned height)
 360 {
 361     struct r300_context *r300 = r300_context(pipe);
 362
 363     r300_blitter_begin(r300, R300_CLEAR_SURFACE);
 364     util_blitter_clear_render_target(r300->blitter, dst, color,
 365                                      dstx, dsty, width, height);
 366     r300_blitter_end(r300);
 367 }
 368
 369 /* Clear a region of a depth stencil surface. */
 370 static void r300_clear_depth_stencil(struct pipe_context *pipe,
 371                                      struct pipe_surface *dst,
 372                                      unsigned clear_flags,
 373                                      double depth,
 374                                      unsigned stencil,
 375                                      unsigned dstx, unsigned dsty,
 376                                      unsigned width, unsigned height)
 377 {
 378     struct r300_context *r300 = r300_context(pipe);
 379     struct pipe_framebuffer_state *fb =
 380         (struct pipe_framebuffer_state*)r300->fb_state.state;
 381
 382     if (r300->zmask_in_use && !r300->locked_zbuffer) {
 383         if (fb->zsbuf->texture == dst->texture) {
 384             r300_decompress_zmask(r300);
 385         }
 386     }
 387
 388     /* XXX Do not decompress ZMask of the currently-set zbuffer. */
 389     r300_blitter_begin(r300, R300_CLEAR_SURFACE);
 390     util_blitter_clear_depth_stencil(r300->blitter, dst, clear_flags, depth, stencil,
 391                                      dstx, dsty, width, height);
 392     r300_blitter_end(r300);
 393 }
 394
 395 void r300_decompress_zmask(struct r300_context *r300)
 396 {
 397     struct pipe_framebuffer_state *fb =
 398         (struct pipe_framebuffer_state*)r300->fb_state.state;
 399
 400     if (!r300->zmask_in_use || r300->locked_zbuffer)
 401         return;
 402
 403     r300->zmask_decompress = TRUE;
 404     r300_mark_atom_dirty(r300, &r300->hyperz_state);
 405
 406     r300_blitter_begin(r300, R300_DECOMPRESS);
 407     util_blitter_clear_depth_custom(r300->blitter, fb->width, fb->height, 0,
 408                                     r300->dsa_decompress_zmask);
 409     r300_blitter_end(r300);
 410
 411     r300->zmask_decompress = FALSE;
 412     r300->zmask_in_use = FALSE;
 413     r300_mark_atom_dirty(r300, &r300->hyperz_state);
 414 }
 415
 416 void r300_decompress_zmask_locked_unsafe(struct r300_context *r300)
 417 {
 418     struct pipe_framebuffer_state fb;
 419
 420     memset(&fb, 0, sizeof(fb));
 421     fb.width = r300->locked_zbuffer->width;
 422     fb.height = r300->locked_zbuffer->height;
 423     fb.zsbuf = r300->locked_zbuffer;
 424
 425     r300->context.set_framebuffer_state(&r300->context, &fb);
 426     r300_decompress_zmask(r300);
 427 }
 428
 429 void r300_decompress_zmask_locked(struct r300_context *r300)
 430 {
 431     struct pipe_framebuffer_state saved_fb;
 432
 433     memset(&saved_fb, 0, sizeof(saved_fb));
 434     util_copy_framebuffer_state(&saved_fb, r300->fb_state.state);
 435     r300_decompress_zmask_locked_unsafe(r300);
 436     r300->context.set_framebuffer_state(&r300->context, &saved_fb);
 437     util_unreference_framebuffer_state(&saved_fb);
 438
 439     pipe_surface_reference(&r300->locked_zbuffer, NULL);
 440 }
 441
 442 bool r300_is_blit_supported(enum pipe_format format)
 443 {
 444     const struct util_format_description *desc =
 445         util_format_description(format);
 446
 447     return desc->layout == UTIL_FORMAT_LAYOUT_PLAIN ||
 448            desc->layout == UTIL_FORMAT_LAYOUT_S3TC ||
 449            desc->layout == UTIL_FORMAT_LAYOUT_RGTC;
 450 }
 451
 452 /* Copy a block of pixels from one surface to another. */
 453 static void r300_resource_copy_region(struct pipe_context *pipe,
 454                                       struct pipe_resource *dst,
 455                                       unsigned dst_level,
 456                                       unsigned dstx, unsigned dsty, unsigned dstz,
 457                                       struct pipe_resource *src,
 458                                       unsigned src_level,
 459                                       const struct pipe_box *src_box)
 460 {
 461     struct pipe_screen *screen = pipe->screen;
 462     struct r300_context *r300 = r300_context(pipe);
 463     struct pipe_framebuffer_state *fb =
 464         (struct pipe_framebuffer_state*)r300->fb_state.state;
 465     unsigned src_width0 = r300_resource(src)->tex.width0;
 466     unsigned src_height0 = r300_resource(src)->tex.height0;
 467     unsigned dst_width0 = r300_resource(dst)->tex.width0;
 468     unsigned dst_height0 = r300_resource(dst)->tex.height0;
 469     unsigned layout;
 470     struct pipe_box box;
 471     struct pipe_sampler_view src_templ, *src_view;
 472     struct pipe_surface dst_templ, *dst_view;
 473
 474     /* Fallback for buffers. */
 475     if ((dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER) ||
 476         !r300_is_blit_supported(dst->format)) {
 477         util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,
 478                                   src, src_level, src_box);
 479         return;
 480     }
 481
 482     /* The code below changes the texture format so that the copy can be done
 483      * on hardware. E.g. depth-stencil surfaces are copied as RGBA
 484      * colorbuffers. */
 485
 486     util_blitter_default_dst_texture(&dst_templ, dst, dst_level, dstz, src_box);
 487     util_blitter_default_src_texture(&src_templ, src, src_level);
 488
 489     layout = util_format_description(dst_templ.format)->layout;
 490
 491     /* Handle non-renderable plain formats. */
 492     if (layout == UTIL_FORMAT_LAYOUT_PLAIN &&
 493         (!screen->is_format_supported(screen, src_templ.format, src->target,
 494                                       src->nr_samples,
 495                                       PIPE_BIND_SAMPLER_VIEW) ||
 496          !screen->is_format_supported(screen, dst_templ.format, dst->target,
 497                                       dst->nr_samples,
 498                                       PIPE_BIND_RENDER_TARGET))) {
 499         switch (util_format_get_blocksize(dst_templ.format)) {
 500             case 1:
 501                 dst_templ.format = PIPE_FORMAT_I8_UNORM;
 502                 break;
 503             case 2:
 504                 dst_templ.format = PIPE_FORMAT_B4G4R4A4_UNORM;
 505                 break;
 506             case 4:
 507                 dst_templ.format = PIPE_FORMAT_B8G8R8A8_UNORM;
 508                 break;
 509             case 8:
 510                 dst_templ.format = PIPE_FORMAT_R16G16B16A16_UNORM;
 511                 break;
 512             default:
 513                 debug_printf("r300: copy_region: Unhandled format: %s. Falling back to software.\n"
 514                              "r300: copy_region: Software fallback doesn't work for tiled textures.\n",
 515                              util_format_short_name(dst_templ.format));
 516         }
 517         src_templ.format = dst_templ.format;
 518     }
 519
 520     /* Handle compressed formats. */
 521     if (layout == UTIL_FORMAT_LAYOUT_S3TC ||
 522         layout == UTIL_FORMAT_LAYOUT_RGTC) {
 523         assert(src_templ.format == dst_templ.format);
 524
 525         box = *src_box;
 526         src_box = &box;
 527
 528         dst_width0 = align(dst_width0, 4);
 529         dst_height0 = align(dst_height0, 4);
 530         src_width0 = align(src_width0, 4);
 531         src_height0 = align(src_height0, 4);
 532         box.width = align(box.width, 4);
 533         box.height = align(box.height, 4);
 534
 535         switch (util_format_get_blocksize(dst_templ.format)) {
 536         case 8:
 537             /* one 4x4 pixel block has 8 bytes.
 538              * we set 1 pixel = 4 bytes ===> 1 block corrensponds to 2 pixels. */
 539             dst_templ.format = PIPE_FORMAT_R8G8B8A8_UNORM;
 540             dst_width0 = dst_width0 / 2;
 541             src_width0 = src_width0 / 2;
 542             dstx /= 2;
 543             box.x /= 2;
 544             box.width /= 2;
 545             break;
 546         case 16:
 547             /* one 4x4 pixel block has 16 bytes.
 548              * we set 1 pixel = 4 bytes ===> 1 block corresponds to 4 pixels. */
 549             dst_templ.format = PIPE_FORMAT_R8G8B8A8_UNORM;
 550             break;
 551         }
 552         src_templ.format = dst_templ.format;
 553
 554         dst_height0 = dst_height0 / 4;
 555         src_height0 = src_height0 / 4;
 556         dsty /= 4;
 557         box.y /= 4;
 558         box.height /= 4;
 559     }
 560
 561     /* Fallback for textures. */
 562     if (!screen->is_format_supported(screen, dst_templ.format,
 563                                      dst->target, dst->nr_samples,
 564                                      PIPE_BIND_RENDER_TARGET) ||
 565         !screen->is_format_supported(screen, src_templ.format,
 566                                      src->target, src->nr_samples,
 567                                      PIPE_BIND_SAMPLER_VIEW)) {
 568         assert(0 && "this shouldn't happen, update r300_is_blit_supported");
 569         util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,
 570                                   src, src_level, src_box);
 571         return;
 572     }
 573
 574     /* Decompress ZMASK. */
 575     if (r300->zmask_in_use && !r300->locked_zbuffer) {
 576         if (fb->zsbuf->texture == src ||
 577             fb->zsbuf->texture == dst) {
 578             r300_decompress_zmask(r300);
 579         }
 580     }
 581
 582     dst_view = r300_create_surface_custom(pipe, dst, &dst_templ, dst_width0, dst_height0);
 583     src_view = r300_create_sampler_view_custom(pipe, src, &src_templ, src_width0, src_height0);
 584
 585     r300_blitter_begin(r300, R300_COPY);
 586     util_blitter_copy_texture_view(r300->blitter, dst_view, dstx, dsty,
 587                                    src_view, src_box,
 588                                    src_width0, src_height0);
 589     r300_blitter_end(r300);
 590
 591     pipe_surface_reference(&dst_view, NULL);
 592     pipe_sampler_view_reference(&src_view, NULL);
 593 }
 594
 595 void r300_init_blit_functions(struct r300_context *r300)
 596 {
 597     r300->context.clear = r300_clear;
 598     r300->context.clear_render_target = r300_clear_render_target;
 599     r300->context.clear_depth_stencil = r300_clear_depth_stencil;
 600     r300->context.resource_copy_region = r300_resource_copy_region;
 601 }