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