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_BLIT          = R300_STOP_QUERY | R300_SAVE_FRAMEBUFFER |
  46                          R300_SAVE_TEXTURES | R300_IGNORE_RENDER_COND,
  47
  48     R300_DECOMPRESS    = R300_STOP_QUERY | R300_IGNORE_RENDER_COND,
  49 };
  50
  51 static void r300_blitter_begin(struct r300_context* r300, enum r300_blitter_op op)
  52 {
  53     if ((op & R300_STOP_QUERY) && r300->query_current) {
  54         r300->blitter_saved_query = r300->query_current;
  55         r300_stop_query(r300);
  56     }
  57
  58     /* Yeah we have to save all those states to ensure the blitter operation
  59      * is really transparent. The states will be restored by the blitter once
  60      * copying is done. */
  61     util_blitter_save_blend(r300->blitter, r300->blend_state.state);
  62     util_blitter_save_depth_stencil_alpha(r300->blitter, r300->dsa_state.state);
  63     util_blitter_save_stencil_ref(r300->blitter, &(r300->stencil_ref));
  64     util_blitter_save_rasterizer(r300->blitter, r300->rs_state.state);
  65     util_blitter_save_fragment_shader(r300->blitter, r300->fs.state);
  66     util_blitter_save_vertex_shader(r300->blitter, r300->vs_state.state);
  67     util_blitter_save_viewport(r300->blitter, &r300->viewport);
  68     util_blitter_save_scissor(r300->blitter, r300->scissor_state.state);
  69     util_blitter_save_vertex_buffers(r300->blitter, r300->nr_vertex_buffers,
  70                                      r300->vertex_buffer);
  71     util_blitter_save_vertex_elements(r300->blitter, r300->velems);
  72
  73     if (op & R300_SAVE_FRAMEBUFFER) {
  74         util_blitter_save_framebuffer(r300->blitter, r300->fb_state.state);
  75     }
  76
  77     if (op & R300_SAVE_TEXTURES) {
  78         struct r300_textures_state* state =
  79             (struct r300_textures_state*)r300->textures_state.state;
  80
  81         util_blitter_save_fragment_sampler_states(
  82             r300->blitter, state->sampler_state_count,
  83             (void**)state->sampler_states);
  84
  85         util_blitter_save_fragment_sampler_views(
  86             r300->blitter, state->sampler_view_count,
  87             (struct pipe_sampler_view**)state->sampler_views);
  88     }
  89
  90     if (op & R300_IGNORE_RENDER_COND) {
  91         /* Save the flag. */
  92         r300->blitter_saved_skip_rendering = r300->skip_rendering+1;
  93         r300->skip_rendering = FALSE;
  94     } else {
  95         r300->blitter_saved_skip_rendering = 0;
  96     }
  97 }
  98
  99 static void r300_blitter_end(struct r300_context *r300)
 100 {
 101     if (r300->blitter_saved_query) {
 102         r300_resume_query(r300, r300->blitter_saved_query);
 103         r300->blitter_saved_query = NULL;
 104     }
 105
 106     if (r300->blitter_saved_skip_rendering) {
 107         /* Restore the flag. */
 108         r300->skip_rendering = r300->blitter_saved_skip_rendering-1;
 109     }
 110 }
 111
 112 static uint32_t r300_depth_clear_cb_value(enum pipe_format format,
 113                                           const float* rgba)
 114 {
 115     union util_color uc;
 116     util_pack_color(rgba, format, &uc);
 117
 118     if (util_format_get_blocksizebits(format) == 32)
 119         return uc.ui;
 120     else
 121         return uc.us | (uc.us << 16);
 122 }
 123
 124 static boolean r300_cbzb_clear_allowed(struct r300_context *r300,
 125                                        unsigned clear_buffers)
 126 {
 127     struct pipe_framebuffer_state *fb =
 128         (struct pipe_framebuffer_state*)r300->fb_state.state;
 129
 130     /* Only color clear allowed, and only one colorbuffer. */
 131     if (clear_buffers != PIPE_CLEAR_COLOR || fb->nr_cbufs != 1)
 132         return FALSE;
 133
 134     return r300_surface(fb->cbufs[0])->cbzb_allowed;
 135 }
 136
 137 static boolean r300_fast_zclear_allowed(struct r300_context *r300)
 138 {
 139     struct pipe_framebuffer_state *fb =
 140         (struct pipe_framebuffer_state*)r300->fb_state.state;
 141
 142     return r300_resource(fb->zsbuf->texture)->tex.zmask_dwords[fb->zsbuf->u.tex.level] != 0;
 143 }
 144
 145 static boolean r300_hiz_clear_allowed(struct r300_context *r300)
 146 {
 147     struct pipe_framebuffer_state *fb =
 148         (struct pipe_framebuffer_state*)r300->fb_state.state;
 149
 150     return r300_resource(fb->zsbuf->texture)->tex.hiz_dwords[fb->zsbuf->u.tex.level] != 0;
 151 }
 152
 153 static uint32_t r300_depth_clear_value(enum pipe_format format,
 154                                        double depth, unsigned stencil)
 155 {
 156     switch (format) {
 157         case PIPE_FORMAT_Z16_UNORM:
 158         case PIPE_FORMAT_X8Z24_UNORM:
 159             return util_pack_z(format, depth);
 160
 161         case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 162             return util_pack_z_stencil(format, depth, stencil);
 163
 164         default:
 165             assert(0);
 166             return 0;
 167     }
 168 }
 169
 170 static uint32_t r300_hiz_clear_value(double depth)
 171 {
 172     uint32_t r = (uint32_t)(CLAMP(depth, 0, 1) * 255.5);
 173     assert(r <= 255);
 174     return r | (r << 8) | (r << 16) | (r << 24);
 175 }
 176
 177 /* Clear currently bound buffers. */
 178 static void r300_clear(struct pipe_context* pipe,
 179                        unsigned buffers,
 180                        const union pipe_color_union *color,
 181                        double depth,
 182                        unsigned stencil)
 183 {
 184     /* My notes about Zbuffer compression:
 185      *
 186      * 1) The zbuffer must be micro-tiled and whole microtiles must be
 187      *    written if compression is enabled. If microtiling is disabled,
 188      *    it locks up.
 189      *
 190      * 2) There is ZMASK RAM which contains a compressed zbuffer.
 191      *    Each dword of the Z Mask contains compression information
 192      *    for 16 4x4 pixel tiles, that is 2 bits for each tile.
 193      *    On chips with 2 Z pipes, every other dword maps to a different
 194      *    pipe. On newer chipsets, there is a new compression mode
 195      *    with 8x8 pixel tiles per 2 bits.
 196      *
 197      * 3) The FASTFILL bit has nothing to do with filling. It only tells hw
 198      *    it should look in the ZMASK RAM first before fetching from a real
 199      *    zbuffer.
 200      *
 201      * 4) If a pixel is in a cleared state, ZB_DEPTHCLEARVALUE is returned
 202      *    during zbuffer reads instead of the value that is actually stored
 203      *    in the zbuffer memory. A pixel is in a cleared state when its ZMASK
 204      *    is equal to 0. Therefore, if you clear ZMASK with zeros, you may
 205      *    leave the zbuffer memory uninitialized, but then you must enable
 206      *    compression, so that the ZMASK RAM is actually used.
 207      *
 208      * 5) Each 4x4 (or 8x8) tile is automatically decompressed and recompressed
 209      *    during zbuffer updates. A special decompressing operation should be
 210      *    used to fully decompress a zbuffer, which basically just stores all
 211      *    compressed tiles in ZMASK to the zbuffer memory.
 212      *
 213      * 6) For a 16-bit zbuffer, compression causes a hung with one or
 214      *    two samples and should not be used.
 215      *
 216      * 7) FORCE_COMPRESSED_STENCIL_VALUE should be enabled for stencil clears
 217      *    to avoid needless decompression.
 218      *
 219      * 8) Fastfill must not be used if reading of compressed Z data is disabled
 220      *    and writing of compressed Z data is enabled (RD/WR_COMP_ENABLE),
 221      *    i.e. it cannot be used to compress the zbuffer.
 222      *
 223      * 9) ZB_CB_CLEAR does not interact with zbuffer compression in any way.
 224      *
 225      * - Marek
 226      */
 227
 228     struct r300_context* r300 = r300_context(pipe);
 229     struct pipe_framebuffer_state *fb =
 230         (struct pipe_framebuffer_state*)r300->fb_state.state;
 231     struct r300_hyperz_state *hyperz =
 232         (struct r300_hyperz_state*)r300->hyperz_state.state;
 233     uint32_t width = fb->width;
 234     uint32_t height = fb->height;
 235     uint32_t hyperz_dcv = hyperz->zb_depthclearvalue;
 236
 237     /* Enable fast Z clear.
 238      * The zbuffer must be in micro-tiled mode, otherwise it locks up. */
 239     if (buffers & PIPE_CLEAR_DEPTHSTENCIL) {
 240         boolean zmask_clear, hiz_clear;
 241
 242         zmask_clear = r300_fast_zclear_allowed(r300);
 243         hiz_clear = r300_hiz_clear_allowed(r300);
 244
 245         /* If we need Hyper-Z. */
 246         if (zmask_clear || hiz_clear) {
 247             r300->num_z_clears++;
 248
 249             /* Try to obtain the access to Hyper-Z buffers if we don't have one. */
 250             if (!r300->hyperz_enabled) {
 251                 r300->hyperz_enabled =
 252                     r300->rws->cs_request_feature(r300->cs,
 253                                                 RADEON_FID_R300_HYPERZ_ACCESS,
 254                                                 TRUE);
 255                 if (r300->hyperz_enabled) {
 256                    /* Need to emit HyperZ buffer regs for the first time. */
 257                    r300_mark_fb_state_dirty(r300, R300_CHANGED_HYPERZ_FLAG);
 258                 }
 259             }
 260
 261             /* Setup Hyper-Z clears. */
 262             if (r300->hyperz_enabled) {
 263                 DBG(r300, DBG_HYPERZ, "r300: Clear memory: %s%s\n",
 264                     zmask_clear ? "ZMASK " : "", hiz_clear ? "HIZ" : "");
 265
 266                 if (zmask_clear) {
 267                     hyperz_dcv = hyperz->zb_depthclearvalue =
 268                         r300_depth_clear_value(fb->zsbuf->format, depth, stencil);
 269
 270                     r300_mark_atom_dirty(r300, &r300->zmask_clear);
 271                     buffers &= ~PIPE_CLEAR_DEPTHSTENCIL;
 272                 }
 273
 274                 if (hiz_clear) {
 275                     r300->hiz_clear_value = r300_hiz_clear_value(depth);
 276                     r300_mark_atom_dirty(r300, &r300->hiz_clear);
 277                 }
 278             }
 279         }
 280     }
 281
 282     /* Enable CBZB clear. */
 283     if (r300_cbzb_clear_allowed(r300, buffers)) {
 284         struct r300_surface *surf = r300_surface(fb->cbufs[0]);
 285
 286         hyperz->zb_depthclearvalue =
 287                 r300_depth_clear_cb_value(surf->base.format, color->f);
 288
 289         width = surf->cbzb_width;
 290         height = surf->cbzb_height;
 291
 292         r300->cbzb_clear = TRUE;
 293         r300_mark_fb_state_dirty(r300, R300_CHANGED_HYPERZ_FLAG);
 294     }
 295
 296     /* Clear. */
 297     if (buffers) {
 298         enum pipe_format cformat = fb->nr_cbufs ? fb->cbufs[0]->format : PIPE_FORMAT_NONE;
 299         /* Clear using the blitter. */
 300         r300_blitter_begin(r300, R300_CLEAR);
 301         util_blitter_clear(r300->blitter,
 302                            width,
 303                            height,
 304                            fb->nr_cbufs,
 305                            buffers, cformat, color, depth, stencil);
 306         r300_blitter_end(r300);
 307     } else if (r300->zmask_clear.dirty || r300->hiz_clear.dirty) {
 308         /* Just clear zmask and hiz now, this does not use the standard draw
 309          * procedure. */
 310         /* Calculate zmask_clear and hiz_clear atom sizes. */
 311         unsigned dwords =
 312             (r300->zmask_clear.dirty ? r300->zmask_clear.size : 0) +
 313             (r300->hiz_clear.dirty ? r300->hiz_clear.size : 0) +
 314             r300_get_num_cs_end_dwords(r300);
 315
 316         /* Reserve CS space. */
 317         if (dwords > (RADEON_MAX_CMDBUF_DWORDS - r300->cs->cdw)) {
 318             r300_flush(&r300->context, RADEON_FLUSH_ASYNC, NULL);
 319         }
 320
 321         /* Emit clear packets. */
 322         if (r300->zmask_clear.dirty) {
 323             r300_emit_zmask_clear(r300, r300->zmask_clear.size,
 324                                   r300->zmask_clear.state);
 325             r300->zmask_clear.dirty = FALSE;
 326         }
 327         if (r300->hiz_clear.dirty) {
 328             r300_emit_hiz_clear(r300, r300->hiz_clear.size,
 329                                 r300->hiz_clear.state);
 330             r300->hiz_clear.dirty = FALSE;
 331         }
 332     } else {
 333         assert(0);
 334     }
 335
 336     /* Disable CBZB clear. */
 337     if (r300->cbzb_clear) {
 338         r300->cbzb_clear = FALSE;
 339         hyperz->zb_depthclearvalue = hyperz_dcv;
 340         r300_mark_fb_state_dirty(r300, R300_CHANGED_HYPERZ_FLAG);
 341     }
 342
 343     /* Enable fastfill and/or hiz.
 344      *
 345      * If we cleared zmask/hiz, it's in use now. The Hyper-Z state update
 346      * looks if zmask/hiz is in use and programs hardware accordingly. */
 347     if (r300->zmask_in_use || r300->hiz_in_use) {
 348         r300_mark_atom_dirty(r300, &r300->hyperz_state);
 349     }
 350 }
 351
 352 /* Clear a region of a color surface to a constant value. */
 353 static void r300_clear_render_target(struct pipe_context *pipe,
 354                                      struct pipe_surface *dst,
 355                                      const union pipe_color_union *color,
 356                                      unsigned dstx, unsigned dsty,
 357                                      unsigned width, unsigned height)
 358 {
 359     struct r300_context *r300 = r300_context(pipe);
 360
 361     r300_blitter_begin(r300, R300_CLEAR_SURFACE);
 362     util_blitter_clear_render_target(r300->blitter, dst, color,
 363                                      dstx, dsty, width, height);
 364     r300_blitter_end(r300);
 365 }
 366
 367 /* Clear a region of a depth stencil surface. */
 368 static void r300_clear_depth_stencil(struct pipe_context *pipe,
 369                                      struct pipe_surface *dst,
 370                                      unsigned clear_flags,
 371                                      double depth,
 372                                      unsigned stencil,
 373                                      unsigned dstx, unsigned dsty,
 374                                      unsigned width, unsigned height)
 375 {
 376     struct r300_context *r300 = r300_context(pipe);
 377     struct pipe_framebuffer_state *fb =
 378         (struct pipe_framebuffer_state*)r300->fb_state.state;
 379
 380     if (r300->zmask_in_use && !r300->locked_zbuffer) {
 381         if (fb->zsbuf->texture == dst->texture) {
 382             r300_decompress_zmask(r300);
 383         }
 384     }
 385
 386     /* XXX Do not decompress ZMask of the currently-set zbuffer. */
 387     r300_blitter_begin(r300, R300_CLEAR_SURFACE);
 388     util_blitter_clear_depth_stencil(r300->blitter, dst, clear_flags, depth, stencil,
 389                                      dstx, dsty, width, height);
 390     r300_blitter_end(r300);
 391 }
 392
 393 void r300_decompress_zmask(struct r300_context *r300)
 394 {
 395     struct pipe_framebuffer_state *fb =
 396         (struct pipe_framebuffer_state*)r300->fb_state.state;
 397
 398     if (!r300->zmask_in_use || r300->locked_zbuffer)
 399         return;
 400
 401     r300->zmask_decompress = TRUE;
 402     r300_mark_atom_dirty(r300, &r300->hyperz_state);
 403
 404     r300_blitter_begin(r300, R300_DECOMPRESS);
 405     util_blitter_custom_clear_depth(r300->blitter, fb->width, fb->height, 0,
 406                                     r300->dsa_decompress_zmask);
 407     r300_blitter_end(r300);
 408
 409     r300->zmask_decompress = FALSE;
 410     r300->zmask_in_use = FALSE;
 411     r300_mark_atom_dirty(r300, &r300->hyperz_state);
 412 }
 413
 414 void r300_decompress_zmask_locked_unsafe(struct r300_context *r300)
 415 {
 416     struct pipe_framebuffer_state fb;
 417
 418     memset(&fb, 0, sizeof(fb));
 419     fb.width = r300->locked_zbuffer->width;
 420     fb.height = r300->locked_zbuffer->height;
 421     fb.zsbuf = r300->locked_zbuffer;
 422
 423     r300->context.set_framebuffer_state(&r300->context, &fb);
 424     r300_decompress_zmask(r300);
 425 }
 426
 427 void r300_decompress_zmask_locked(struct r300_context *r300)
 428 {
 429     struct pipe_framebuffer_state saved_fb;
 430
 431     memset(&saved_fb, 0, sizeof(saved_fb));
 432     util_copy_framebuffer_state(&saved_fb, r300->fb_state.state);
 433     r300_decompress_zmask_locked_unsafe(r300);
 434     r300->context.set_framebuffer_state(&r300->context, &saved_fb);
 435     util_unreference_framebuffer_state(&saved_fb);
 436
 437     pipe_surface_reference(&r300->locked_zbuffer, NULL);
 438 }
 439
 440 bool r300_is_blit_supported(enum pipe_format format)
 441 {
 442     const struct util_format_description *desc =
 443         util_format_description(format);
 444
 445     return desc->layout == UTIL_FORMAT_LAYOUT_PLAIN ||
 446            desc->layout == UTIL_FORMAT_LAYOUT_S3TC ||
 447            desc->layout == UTIL_FORMAT_LAYOUT_RGTC;
 448 }
 449
 450 /* Copy a block of pixels from one surface to another. */
 451 static void r300_resource_copy_region(struct pipe_context *pipe,
 452                                       struct pipe_resource *dst,
 453                                       unsigned dst_level,
 454                                       unsigned dstx, unsigned dsty, unsigned dstz,
 455                                       struct pipe_resource *src,
 456                                       unsigned src_level,
 457                                       const struct pipe_box *src_box)
 458 {
 459     struct pipe_screen *screen = pipe->screen;
 460     struct r300_context *r300 = r300_context(pipe);
 461     struct pipe_framebuffer_state *fb =
 462         (struct pipe_framebuffer_state*)r300->fb_state.state;
 463     unsigned src_width0 = r300_resource(src)->tex.width0;
 464     unsigned src_height0 = r300_resource(src)->tex.height0;
 465     unsigned dst_width0 = r300_resource(dst)->tex.width0;
 466     unsigned dst_height0 = r300_resource(dst)->tex.height0;
 467     unsigned layout;
 468     struct pipe_box box;
 469     struct pipe_sampler_view src_templ, *src_view;
 470     struct pipe_surface dst_templ, *dst_view;
 471
 472     /* Fallback for buffers. */
 473     if ((dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER) ||
 474         !r300_is_blit_supported(dst->format)) {
 475         util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,
 476                                   src, src_level, src_box);
 477         return;
 478     }
 479
 480     /* The code below changes the texture format so that the copy can be done
 481      * on hardware. E.g. depth-stencil surfaces are copied as RGBA
 482      * colorbuffers. */
 483
 484     util_blitter_default_dst_texture(&dst_templ, dst, dst_level, dstz, src_box);
 485     util_blitter_default_src_texture(&src_templ, src, src_level);
 486
 487     layout = util_format_description(dst_templ.format)->layout;
 488
 489     /* Handle non-renderable plain formats. */
 490     if (layout == UTIL_FORMAT_LAYOUT_PLAIN &&
 491         (!screen->is_format_supported(screen, src_templ.format, src->target,
 492                                       src->nr_samples,
 493                                       PIPE_BIND_SAMPLER_VIEW) ||
 494          !screen->is_format_supported(screen, dst_templ.format, dst->target,
 495                                       dst->nr_samples,
 496                                       PIPE_BIND_RENDER_TARGET))) {
 497         switch (util_format_get_blocksize(dst_templ.format)) {
 498             case 1:
 499                 dst_templ.format = PIPE_FORMAT_I8_UNORM;
 500                 break;
 501             case 2:
 502                 dst_templ.format = PIPE_FORMAT_B4G4R4A4_UNORM;
 503                 break;
 504             case 4:
 505                 dst_templ.format = PIPE_FORMAT_B8G8R8A8_UNORM;
 506                 break;
 507             case 8:
 508                 dst_templ.format = PIPE_FORMAT_R16G16B16A16_UNORM;
 509                 break;
 510             default:
 511                 debug_printf("r300: copy_region: Unhandled format: %s. Falling back to software.\n"
 512                              "r300: copy_region: Software fallback doesn't work for tiled textures.\n",
 513                              util_format_short_name(dst_templ.format));
 514         }
 515         src_templ.format = dst_templ.format;
 516     }
 517
 518     /* Handle compressed formats. */
 519     if (layout == UTIL_FORMAT_LAYOUT_S3TC ||
 520         layout == UTIL_FORMAT_LAYOUT_RGTC) {
 521         assert(src_templ.format == dst_templ.format);
 522
 523         box = *src_box;
 524         src_box = &box;
 525
 526         dst_width0 = align(dst_width0, 4);
 527         dst_height0 = align(dst_height0, 4);
 528         src_width0 = align(src_width0, 4);
 529         src_height0 = align(src_height0, 4);
 530         box.width = align(box.width, 4);
 531         box.height = align(box.height, 4);
 532
 533         switch (util_format_get_blocksize(dst_templ.format)) {
 534         case 8:
 535             /* one 4x4 pixel block has 8 bytes.
 536              * we set 1 pixel = 4 bytes ===> 1 block corrensponds to 2 pixels. */
 537             dst_templ.format = PIPE_FORMAT_R8G8B8A8_UNORM;
 538             dst_width0 = dst_width0 / 2;
 539             src_width0 = src_width0 / 2;
 540             dstx /= 2;
 541             box.x /= 2;
 542             box.width /= 2;
 543             break;
 544         case 16:
 545             /* one 4x4 pixel block has 16 bytes.
 546              * we set 1 pixel = 4 bytes ===> 1 block corresponds to 4 pixels. */
 547             dst_templ.format = PIPE_FORMAT_R8G8B8A8_UNORM;
 548             break;
 549         }
 550         src_templ.format = dst_templ.format;
 551
 552         dst_height0 = dst_height0 / 4;
 553         src_height0 = src_height0 / 4;
 554         dsty /= 4;
 555         box.y /= 4;
 556         box.height /= 4;
 557     }
 558
 559     /* Fallback for textures. */
 560     if (!screen->is_format_supported(screen, dst_templ.format,
 561                                      dst->target, dst->nr_samples,
 562                                      PIPE_BIND_RENDER_TARGET) ||
 563         !screen->is_format_supported(screen, src_templ.format,
 564                                      src->target, src->nr_samples,
 565                                      PIPE_BIND_SAMPLER_VIEW)) {
 566         assert(0 && "this shouldn't happen, update r300_is_blit_supported");
 567         util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,
 568                                   src, src_level, src_box);
 569         return;
 570     }
 571
 572     /* Decompress ZMASK. */
 573     if (r300->zmask_in_use && !r300->locked_zbuffer) {
 574         if (fb->zsbuf->texture == src ||
 575             fb->zsbuf->texture == dst) {
 576             r300_decompress_zmask(r300);
 577         }
 578     }
 579
 580     dst_view = r300_create_surface_custom(pipe, dst, &dst_templ, dst_width0, dst_height0);
 581     src_view = r300_create_sampler_view_custom(pipe, src, &src_templ, src_width0, src_height0);
 582
 583     r300_blitter_begin(r300, R300_COPY);
 584     util_blitter_blit_generic(r300->blitter, dst_view, dstx, dsty,
 585                               abs(src_box->width), abs(src_box->height),
 586                               src_view, src_box,
 587                               src_width0, src_height0, PIPE_MASK_RGBAZS,
 588                               PIPE_TEX_FILTER_NEAREST, NULL, FALSE);
 589     r300_blitter_end(r300);
 590
 591     pipe_surface_reference(&dst_view, NULL);
 592     pipe_sampler_view_reference(&src_view, NULL);
 593 }
 594
 595 static void r300_blit(struct pipe_context *pipe,
 596                       const struct pipe_blit_info *blit_info)
 597 {
 598     struct r300_context *r300 = r300_context(pipe);
 599     struct pipe_framebuffer_state *fb =
 600         (struct pipe_framebuffer_state*)r300->fb_state.state;
 601     struct pipe_blit_info info = *blit_info;
 602
 603     /* Decompress ZMASK. */
 604     if (r300->zmask_in_use && !r300->locked_zbuffer) {
 605         if (fb->zsbuf->texture == info.src.resource ||
 606             fb->zsbuf->texture == info.dst.resource) {
 607             r300_decompress_zmask(r300);
 608         }
 609     }
 610
 611     /* Blit a combined depth-stencil resource as color.
 612      * S8Z24 is the only supported stencil format. */
 613     if ((info.mask & PIPE_MASK_S) &&
 614         info.src.format == PIPE_FORMAT_S8_UINT_Z24_UNORM &&
 615         info.dst.format == PIPE_FORMAT_S8_UINT_Z24_UNORM) {
 616         info.src.format = PIPE_FORMAT_B8G8R8A8_UNORM;
 617         info.dst.format = PIPE_FORMAT_B8G8R8A8_UNORM;
 618         if (info.mask & PIPE_MASK_Z) {
 619             info.mask = PIPE_MASK_RGBA; /* depth+stencil */
 620         } else {
 621             info.mask = PIPE_MASK_B; /* stencil only */
 622         }
 623     }
 624
 625     r300_blitter_begin(r300, R300_BLIT);
 626     util_blitter_blit(r300->blitter, &info);
 627     r300_blitter_end(r300);
 628 }
 629
 630 void r300_init_blit_functions(struct r300_context *r300)
 631 {
 632     r300->context.clear = r300_clear;
 633     r300->context.clear_render_target = r300_clear_render_target;
 634     r300->context.clear_depth_stencil = r300_clear_depth_stencil;
 635     r300->context.resource_copy_region = r300_resource_copy_region;
 636     r300->context.blit = r300_blit;
 637 }