src/mesa/drivers/dri/i965/brw_blorp.c

   1 /*
   2  * Copyright © 2012 Intel Corporation
   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  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "main/context.h"
  25 #include "main/teximage.h"
  26 #include "main/blend.h"
  27 #include "main/fbobject.h"
  28 #include "main/renderbuffer.h"
  29 #include "main/glformats.h"
  30
  31 #include "brw_blorp.h"
  32 #include "brw_context.h"
  33 #include "brw_defines.h"
  34 #include "brw_meta_util.h"
  35 #include "brw_state.h"
  36 #include "intel_fbo.h"
  37 #include "intel_debug.h"
  38
  39 #define FILE_DEBUG_FLAG DEBUG_BLORP
  40
  41 static bool
  42 brw_blorp_lookup_shader(struct blorp_context *blorp,
  43                         const void *key, uint32_t key_size,
  44                         uint32_t *kernel_out, void *prog_data_out)
  45 {
  46    struct brw_context *brw = blorp->driver_ctx;
  47    return brw_search_cache(&brw->cache, BRW_CACHE_BLORP_PROG,
  48                            key, key_size, kernel_out, prog_data_out);
  49 }
  50
  51 static void
  52 brw_blorp_upload_shader(struct blorp_context *blorp,
  53                         const void *key, uint32_t key_size,
  54                         const void *kernel, uint32_t kernel_size,
  55                         const void *prog_data, uint32_t prog_data_size,
  56                         uint32_t *kernel_out, void *prog_data_out)
  57 {
  58    struct brw_context *brw = blorp->driver_ctx;
  59    brw_upload_cache(&brw->cache, BRW_CACHE_BLORP_PROG, key, key_size,
  60                     kernel, kernel_size, prog_data, prog_data_size,
  61                     kernel_out, prog_data_out);
  62 }
  63
  64 void
  65 brw_blorp_init(struct brw_context *brw)
  66 {
  67    blorp_init(&brw->blorp, brw, &brw->isl_dev);
  68
  69    brw->blorp.compiler = brw->intelScreen->compiler;
  70
  71    switch (brw->gen) {
  72    case 6:
  73       brw->blorp.mocs.tex = 0;
  74       brw->blorp.mocs.rb = 0;
  75       brw->blorp.mocs.vb = 0;
  76       brw->blorp.exec = gen6_blorp_exec;
  77       break;
  78    case 7:
  79       brw->blorp.mocs.tex = GEN7_MOCS_L3;
  80       brw->blorp.mocs.rb = GEN7_MOCS_L3;
  81       brw->blorp.mocs.vb = GEN7_MOCS_L3;
  82       if (brw->is_haswell) {
  83          brw->blorp.exec = gen75_blorp_exec;
  84       } else {
  85          brw->blorp.exec = gen7_blorp_exec;
  86       }
  87       break;
  88    case 8:
  89       brw->blorp.mocs.tex = BDW_MOCS_WB;
  90       brw->blorp.mocs.rb = BDW_MOCS_PTE;
  91       brw->blorp.mocs.vb = BDW_MOCS_WB;
  92       brw->blorp.exec = gen8_blorp_exec;
  93       break;
  94    case 9:
  95       brw->blorp.mocs.tex = SKL_MOCS_WB;
  96       brw->blorp.mocs.rb = SKL_MOCS_PTE;
  97       brw->blorp.mocs.vb = SKL_MOCS_WB;
  98       brw->blorp.exec = gen9_blorp_exec;
  99       break;
 100    default:
 101       unreachable("Invalid gen");
 102    }
 103
 104    brw->blorp.lookup_shader = brw_blorp_lookup_shader;
 105    brw->blorp.upload_shader = brw_blorp_upload_shader;
 106 }
 107
 108 static void
 109 apply_gen6_stencil_hiz_offset(struct isl_surf *surf,
 110                               struct intel_mipmap_tree *mt,
 111                               uint32_t lod,
 112                               uint32_t *offset)
 113 {
 114    assert(mt->array_layout == ALL_SLICES_AT_EACH_LOD);
 115
 116    if (mt->format == MESA_FORMAT_S_UINT8) {
 117       /* Note: we can't compute the stencil offset using
 118        * intel_miptree_get_aligned_offset(), because the miptree
 119        * claims that the region is untiled even though it's W tiled.
 120        */
 121       *offset = mt->level[lod].level_y * mt->pitch +
 122                 mt->level[lod].level_x * 64;
 123    } else {
 124       *offset = intel_miptree_get_aligned_offset(mt,
 125                                                  mt->level[lod].level_x,
 126                                                  mt->level[lod].level_y,
 127                                                  false);
 128    }
 129
 130    surf->logical_level0_px.width = minify(surf->logical_level0_px.width, lod);
 131    surf->logical_level0_px.height = minify(surf->logical_level0_px.height, lod);
 132    surf->phys_level0_sa.width = minify(surf->phys_level0_sa.width, lod);
 133    surf->phys_level0_sa.height = minify(surf->phys_level0_sa.height, lod);
 134    surf->levels = 1;
 135    surf->array_pitch_el_rows =
 136       ALIGN(surf->phys_level0_sa.height, surf->image_alignment_el.height);
 137 }
 138
 139 static void
 140 brw_blorp_surf_for_miptree(struct brw_context *brw,
 141                            struct brw_blorp_surf *surf,
 142                            struct intel_mipmap_tree *mt,
 143                            bool is_render_target,
 144                            unsigned *level,
 145                            struct isl_surf tmp_surfs[2])
 146 {
 147    intel_miptree_get_isl_surf(brw, mt, &tmp_surfs[0]);
 148    surf->surf = &tmp_surfs[0];
 149    surf->addr = (struct blorp_address) {
 150       .buffer = mt->bo,
 151       .offset = mt->offset,
 152       .read_domains = is_render_target ? I915_GEM_DOMAIN_RENDER :
 153                                          I915_GEM_DOMAIN_SAMPLER,
 154       .write_domain = is_render_target ? I915_GEM_DOMAIN_RENDER : 0,
 155    };
 156
 157    if (brw->gen == 6 && mt->format == MESA_FORMAT_S_UINT8 &&
 158        mt->array_layout == ALL_SLICES_AT_EACH_LOD) {
 159       /* Sandy bridge stencil and HiZ use this ALL_SLICES_AT_EACH_LOD hack in
 160        * order to allow for layered rendering.  The hack makes each LOD of the
 161        * stencil or HiZ buffer a single tightly packed array surface at some
 162        * offset into the surface.  Since ISL doesn't know how to deal with the
 163        * crazy ALL_SLICES_AT_EACH_LOD layout and since we have to do a manual
 164        * offset of it anyway, we might as well do the offset here and keep the
 165        * hacks inside the i965 driver.
 166        *
 167        * See also gen6_depth_stencil_state.c
 168        */
 169       uint32_t offset;
 170       apply_gen6_stencil_hiz_offset(&tmp_surfs[0], mt, *level, &offset);
 171       surf->addr.offset += offset;
 172       *level = 0;
 173    }
 174
 175    struct isl_surf *aux_surf = &tmp_surfs[1];
 176    intel_miptree_get_aux_isl_surf(brw, mt, aux_surf, &surf->aux_usage);
 177
 178    /* For textures that are in the RESOLVED state, we ignore the MCS */
 179    if (mt->mcs_mt && !is_render_target &&
 180        mt->fast_clear_state == INTEL_FAST_CLEAR_STATE_RESOLVED)
 181       surf->aux_usage = ISL_AUX_USAGE_NONE;
 182
 183    if (surf->aux_usage != ISL_AUX_USAGE_NONE) {
 184       /* We only really need a clear color if we also have an auxiliary
 185        * surface.  Without one, it does nothing.
 186        */
 187       surf->clear_color = intel_miptree_get_isl_clear_color(brw, mt);
 188
 189       surf->aux_surf = aux_surf;
 190       surf->aux_addr = (struct blorp_address) {
 191          .read_domains = is_render_target ? I915_GEM_DOMAIN_RENDER :
 192                                             I915_GEM_DOMAIN_SAMPLER,
 193          .write_domain = is_render_target ? I915_GEM_DOMAIN_RENDER : 0,
 194       };
 195
 196       if (mt->mcs_mt) {
 197          surf->aux_addr.buffer = mt->mcs_mt->bo;
 198          surf->aux_addr.offset = mt->mcs_mt->offset;
 199       } else {
 200          assert(surf->aux_usage == ISL_AUX_USAGE_HIZ);
 201          struct intel_mipmap_tree *hiz_mt = mt->hiz_buf->mt;
 202          if (hiz_mt) {
 203             surf->aux_addr.buffer = hiz_mt->bo;
 204             if (brw->gen == 6 &&
 205                 hiz_mt->array_layout == ALL_SLICES_AT_EACH_LOD) {
 206                /* gen6 requires the HiZ buffer to be manually offset to the
 207                 * right location.  We could fixup the surf but it doesn't
 208                 * matter since most of those fields don't matter.
 209                 */
 210                apply_gen6_stencil_hiz_offset(aux_surf, hiz_mt, *level,
 211                                              &surf->aux_addr.offset);
 212             } else {
 213                surf->aux_addr.offset = 0;
 214             }
 215             assert(hiz_mt->pitch == aux_surf->row_pitch);
 216          } else {
 217             surf->aux_addr.buffer = mt->hiz_buf->bo;
 218             surf->aux_addr.offset = 0;
 219          }
 220       }
 221    } else {
 222       surf->aux_addr = (struct blorp_address) {
 223          .buffer = NULL,
 224       };
 225       memset(&surf->clear_color, 0, sizeof(surf->clear_color));
 226    }
 227    assert((surf->aux_usage == ISL_AUX_USAGE_NONE) ==
 228           (surf->aux_addr.buffer == NULL));
 229 }
 230
 231 static enum isl_format
 232 brw_blorp_to_isl_format(struct brw_context *brw, mesa_format format,
 233                         bool is_render_target)
 234 {
 235    switch (format) {
 236    case MESA_FORMAT_NONE:
 237       return ISL_FORMAT_UNSUPPORTED;
 238    case MESA_FORMAT_S_UINT8:
 239       return ISL_FORMAT_R8_UINT;
 240    case MESA_FORMAT_Z24_UNORM_X8_UINT:
 241       return ISL_FORMAT_R24_UNORM_X8_TYPELESS;
 242    case MESA_FORMAT_Z_FLOAT32:
 243       return ISL_FORMAT_R32_FLOAT;
 244    case MESA_FORMAT_Z_UNORM16:
 245       return ISL_FORMAT_R16_UNORM;
 246    default: {
 247       if (is_render_target) {
 248          assert(brw->format_supported_as_render_target[format]);
 249          return brw->render_target_format[format];
 250       } else {
 251          return brw_format_for_mesa_format(format);
 252       }
 253       break;
 254    }
 255    }
 256 }
 257
 258 /**
 259  * Note: if the src (or dst) is a 2D multisample array texture on Gen7+ using
 260  * INTEL_MSAA_LAYOUT_UMS or INTEL_MSAA_LAYOUT_CMS, src_layer (dst_layer) is
 261  * the physical layer holding sample 0.  So, for example, if
 262  * src_mt->num_samples == 4, then logical layer n corresponds to src_layer ==
 263  * 4*n.
 264  */
 265 void
 266 brw_blorp_blit_miptrees(struct brw_context *brw,
 267                         struct intel_mipmap_tree *src_mt,
 268                         unsigned src_level, unsigned src_layer,
 269                         mesa_format src_format, int src_swizzle,
 270                         struct intel_mipmap_tree *dst_mt,
 271                         unsigned dst_level, unsigned dst_layer,
 272                         mesa_format dst_format,
 273                         float src_x0, float src_y0,
 274                         float src_x1, float src_y1,
 275                         float dst_x0, float dst_y0,
 276                         float dst_x1, float dst_y1,
 277                         GLenum filter, bool mirror_x, bool mirror_y,
 278                         bool decode_srgb, bool encode_srgb)
 279 {
 280    /* Get ready to blit.  This includes depth resolving the src and dst
 281     * buffers if necessary.  Note: it's not necessary to do a color resolve on
 282     * the destination buffer because we use the standard render path to render
 283     * to destination color buffers, and the standard render path is
 284     * fast-color-aware.
 285     */
 286    intel_miptree_resolve_color(brw, src_mt, INTEL_MIPTREE_IGNORE_CCS_E);
 287    intel_miptree_slice_resolve_depth(brw, src_mt, src_level, src_layer);
 288    intel_miptree_slice_resolve_depth(brw, dst_mt, dst_level, dst_layer);
 289
 290    intel_miptree_prepare_mcs(brw, dst_mt);
 291
 292    DBG("%s from %dx %s mt %p %d %d (%f,%f) (%f,%f)"
 293        "to %dx %s mt %p %d %d (%f,%f) (%f,%f) (flip %d,%d)\n",
 294        __func__,
 295        src_mt->num_samples, _mesa_get_format_name(src_mt->format), src_mt,
 296        src_level, src_layer, src_x0, src_y0, src_x1, src_y1,
 297        dst_mt->num_samples, _mesa_get_format_name(dst_mt->format), dst_mt,
 298        dst_level, dst_layer, dst_x0, dst_y0, dst_x1, dst_y1,
 299        mirror_x, mirror_y);
 300
 301    if (!decode_srgb && _mesa_get_format_color_encoding(src_format) == GL_SRGB)
 302       src_format = _mesa_get_srgb_format_linear(src_format);
 303
 304    if (!encode_srgb && _mesa_get_format_color_encoding(dst_format) == GL_SRGB)
 305       dst_format = _mesa_get_srgb_format_linear(dst_format);
 306
 307    /* When doing a multisample resolve of a GL_LUMINANCE32F or GL_INTENSITY32F
 308     * texture, the above code configures the source format for L32_FLOAT or
 309     * I32_FLOAT, and the destination format for R32_FLOAT.  On Sandy Bridge,
 310     * the SAMPLE message appears to handle multisampled L32_FLOAT and
 311     * I32_FLOAT textures incorrectly, resulting in blocky artifacts.  So work
 312     * around the problem by using a source format of R32_FLOAT.  This
 313     * shouldn't affect rendering correctness, since the destination format is
 314     * R32_FLOAT, so only the contents of the red channel matters.
 315     */
 316    if (brw->gen == 6 &&
 317        src_mt->num_samples > 1 && dst_mt->num_samples <= 1 &&
 318        src_mt->format == dst_mt->format &&
 319        (dst_format == MESA_FORMAT_L_FLOAT32 ||
 320         dst_format == MESA_FORMAT_I_FLOAT32)) {
 321       src_format = dst_format = MESA_FORMAT_R_FLOAT32;
 322    }
 323
 324    intel_miptree_check_level_layer(src_mt, src_level, src_layer);
 325    intel_miptree_check_level_layer(dst_mt, dst_level, dst_layer);
 326    intel_miptree_used_for_rendering(dst_mt);
 327
 328    struct isl_surf tmp_surfs[4];
 329    struct brw_blorp_surf src_surf, dst_surf;
 330    brw_blorp_surf_for_miptree(brw, &src_surf, src_mt, false,
 331                               &src_level, &tmp_surfs[0]);
 332    brw_blorp_surf_for_miptree(brw, &dst_surf, dst_mt, true,
 333                               &dst_level, &tmp_surfs[2]);
 334
 335    brw_blorp_blit(brw, &src_surf, src_level, src_layer,
 336                   brw_blorp_to_isl_format(brw, src_format, false), src_swizzle,
 337                   &dst_surf, dst_level, dst_layer,
 338                   brw_blorp_to_isl_format(brw, dst_format, true),
 339                   src_x0, src_y0, src_x1, src_y1,
 340                   dst_x0, dst_y0, dst_x1, dst_y1,
 341                   filter, mirror_x, mirror_y);
 342
 343    intel_miptree_slice_set_needs_hiz_resolve(dst_mt, dst_level, dst_layer);
 344
 345    if (intel_miptree_is_lossless_compressed(brw, dst_mt))
 346       dst_mt->fast_clear_state = INTEL_FAST_CLEAR_STATE_UNRESOLVED;
 347 }
 348
 349 static struct intel_mipmap_tree *
 350 find_miptree(GLbitfield buffer_bit, struct intel_renderbuffer *irb)
 351 {
 352    struct intel_mipmap_tree *mt = irb->mt;
 353    if (buffer_bit == GL_STENCIL_BUFFER_BIT && mt->stencil_mt)
 354       mt = mt->stencil_mt;
 355    return mt;
 356 }
 357
 358 static int
 359 blorp_get_texture_swizzle(const struct intel_renderbuffer *irb)
 360 {
 361    return irb->Base.Base._BaseFormat == GL_RGB ?
 362       MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_ONE) :
 363       SWIZZLE_XYZW;
 364 }
 365
 366 static void
 367 do_blorp_blit(struct brw_context *brw, GLbitfield buffer_bit,
 368               struct intel_renderbuffer *src_irb, mesa_format src_format,
 369               struct intel_renderbuffer *dst_irb, mesa_format dst_format,
 370               GLfloat srcX0, GLfloat srcY0, GLfloat srcX1, GLfloat srcY1,
 371               GLfloat dstX0, GLfloat dstY0, GLfloat dstX1, GLfloat dstY1,
 372               GLenum filter, bool mirror_x, bool mirror_y)
 373 {
 374    const struct gl_context *ctx = &brw->ctx;
 375
 376    /* Find source/dst miptrees */
 377    struct intel_mipmap_tree *src_mt = find_miptree(buffer_bit, src_irb);
 378    struct intel_mipmap_tree *dst_mt = find_miptree(buffer_bit, dst_irb);
 379
 380    const bool do_srgb = ctx->Color.sRGBEnabled;
 381
 382    /* Do the blit */
 383    brw_blorp_blit_miptrees(brw,
 384                            src_mt, src_irb->mt_level, src_irb->mt_layer,
 385                            src_format, blorp_get_texture_swizzle(src_irb),
 386                            dst_mt, dst_irb->mt_level, dst_irb->mt_layer,
 387                            dst_format,
 388                            srcX0, srcY0, srcX1, srcY1,
 389                            dstX0, dstY0, dstX1, dstY1,
 390                            filter, mirror_x, mirror_y,
 391                            do_srgb, do_srgb);
 392
 393    dst_irb->need_downsample = true;
 394 }
 395
 396 static bool
 397 try_blorp_blit(struct brw_context *brw,
 398                const struct gl_framebuffer *read_fb,
 399                const struct gl_framebuffer *draw_fb,
 400                GLfloat srcX0, GLfloat srcY0, GLfloat srcX1, GLfloat srcY1,
 401                GLfloat dstX0, GLfloat dstY0, GLfloat dstX1, GLfloat dstY1,
 402                GLenum filter, GLbitfield buffer_bit)
 403 {
 404    struct gl_context *ctx = &brw->ctx;
 405
 406    /* Sync up the state of window system buffers.  We need to do this before
 407     * we go looking for the buffers.
 408     */
 409    intel_prepare_render(brw);
 410
 411    bool mirror_x, mirror_y;
 412    if (brw_meta_mirror_clip_and_scissor(ctx, read_fb, draw_fb,
 413                                         &srcX0, &srcY0, &srcX1, &srcY1,
 414                                         &dstX0, &dstY0, &dstX1, &dstY1,
 415                                         &mirror_x, &mirror_y))
 416       return true;
 417
 418    /* Find buffers */
 419    struct intel_renderbuffer *src_irb;
 420    struct intel_renderbuffer *dst_irb;
 421    struct intel_mipmap_tree *src_mt;
 422    struct intel_mipmap_tree *dst_mt;
 423    switch (buffer_bit) {
 424    case GL_COLOR_BUFFER_BIT:
 425       src_irb = intel_renderbuffer(read_fb->_ColorReadBuffer);
 426       for (unsigned i = 0; i < draw_fb->_NumColorDrawBuffers; ++i) {
 427          dst_irb = intel_renderbuffer(draw_fb->_ColorDrawBuffers[i]);
 428          if (dst_irb)
 429             do_blorp_blit(brw, buffer_bit,
 430                           src_irb, src_irb->Base.Base.Format,
 431                           dst_irb, dst_irb->Base.Base.Format,
 432                           srcX0, srcY0, srcX1, srcY1,
 433                           dstX0, dstY0, dstX1, dstY1,
 434                           filter, mirror_x, mirror_y);
 435       }
 436       break;
 437    case GL_DEPTH_BUFFER_BIT:
 438       src_irb =
 439          intel_renderbuffer(read_fb->Attachment[BUFFER_DEPTH].Renderbuffer);
 440       dst_irb =
 441          intel_renderbuffer(draw_fb->Attachment[BUFFER_DEPTH].Renderbuffer);
 442       src_mt = find_miptree(buffer_bit, src_irb);
 443       dst_mt = find_miptree(buffer_bit, dst_irb);
 444
 445       /* We can't handle format conversions between Z24 and other formats
 446        * since we have to lie about the surface format. See the comments in
 447        * brw_blorp_surface_info::set().
 448        */
 449       if ((src_mt->format == MESA_FORMAT_Z24_UNORM_X8_UINT) !=
 450           (dst_mt->format == MESA_FORMAT_Z24_UNORM_X8_UINT))
 451          return false;
 452
 453       do_blorp_blit(brw, buffer_bit, src_irb, MESA_FORMAT_NONE,
 454                     dst_irb, MESA_FORMAT_NONE, srcX0, srcY0,
 455                     srcX1, srcY1, dstX0, dstY0, dstX1, dstY1,
 456                     filter, mirror_x, mirror_y);
 457       break;
 458    case GL_STENCIL_BUFFER_BIT:
 459       src_irb =
 460          intel_renderbuffer(read_fb->Attachment[BUFFER_STENCIL].Renderbuffer);
 461       dst_irb =
 462          intel_renderbuffer(draw_fb->Attachment[BUFFER_STENCIL].Renderbuffer);
 463       do_blorp_blit(brw, buffer_bit, src_irb, MESA_FORMAT_NONE,
 464                     dst_irb, MESA_FORMAT_NONE, srcX0, srcY0,
 465                     srcX1, srcY1, dstX0, dstY0, dstX1, dstY1,
 466                     filter, mirror_x, mirror_y);
 467       break;
 468    default:
 469       unreachable("not reached");
 470    }
 471
 472    return true;
 473 }
 474
 475 bool
 476 brw_blorp_copytexsubimage(struct brw_context *brw,
 477                           struct gl_renderbuffer *src_rb,
 478                           struct gl_texture_image *dst_image,
 479                           int slice,
 480                           int srcX0, int srcY0,
 481                           int dstX0, int dstY0,
 482                           int width, int height)
 483 {
 484    struct gl_context *ctx = &brw->ctx;
 485    struct intel_renderbuffer *src_irb = intel_renderbuffer(src_rb);
 486    struct intel_texture_image *intel_image = intel_texture_image(dst_image);
 487
 488    /* No pixel transfer operations (zoom, bias, mapping), just a blit */
 489    if (brw->ctx._ImageTransferState)
 490       return false;
 491
 492    /* Sync up the state of window system buffers.  We need to do this before
 493     * we go looking at the src renderbuffer's miptree.
 494     */
 495    intel_prepare_render(brw);
 496
 497    struct intel_mipmap_tree *src_mt = src_irb->mt;
 498    struct intel_mipmap_tree *dst_mt = intel_image->mt;
 499
 500    /* There is support for only up to eight samples. */
 501    if (src_mt->num_samples > 8 || dst_mt->num_samples > 8)
 502       return false;
 503
 504    /* BLORP is only supported from Gen6 onwards. */
 505    if (brw->gen < 6)
 506       return false;
 507
 508    if (_mesa_get_format_base_format(src_rb->Format) !=
 509        _mesa_get_format_base_format(dst_image->TexFormat)) {
 510       return false;
 511    }
 512
 513    /* We can't handle format conversions between Z24 and other formats since
 514     * we have to lie about the surface format.  See the comments in
 515     * brw_blorp_surface_info::set().
 516     */
 517    if ((src_mt->format == MESA_FORMAT_Z24_UNORM_X8_UINT) !=
 518        (dst_mt->format == MESA_FORMAT_Z24_UNORM_X8_UINT)) {
 519       return false;
 520    }
 521
 522    if (!brw->format_supported_as_render_target[dst_image->TexFormat])
 523       return false;
 524
 525    /* Source clipping shouldn't be necessary, since copytexsubimage (in
 526     * src/mesa/main/teximage.c) calls _mesa_clip_copytexsubimage() which
 527     * takes care of it.
 528     *
 529     * Destination clipping shouldn't be necessary since the restrictions on
 530     * glCopyTexSubImage prevent the user from specifying a destination rectangle
 531     * that falls outside the bounds of the destination texture.
 532     * See error_check_subtexture_dimensions().
 533     */
 534
 535    int srcY1 = srcY0 + height;
 536    int srcX1 = srcX0 + width;
 537    int dstX1 = dstX0 + width;
 538    int dstY1 = dstY0 + height;
 539
 540    /* Account for the fact that in the system framebuffer, the origin is at
 541     * the lower left.
 542     */
 543    bool mirror_y = false;
 544    if (_mesa_is_winsys_fbo(ctx->ReadBuffer)) {
 545       GLint tmp = src_rb->Height - srcY0;
 546       srcY0 = src_rb->Height - srcY1;
 547       srcY1 = tmp;
 548       mirror_y = true;
 549    }
 550
 551    /* Account for face selection and texture view MinLayer */
 552    int dst_slice = slice + dst_image->TexObject->MinLayer + dst_image->Face;
 553    int dst_level = dst_image->Level + dst_image->TexObject->MinLevel;
 554
 555    brw_blorp_blit_miptrees(brw,
 556                            src_mt, src_irb->mt_level, src_irb->mt_layer,
 557                            src_rb->Format, blorp_get_texture_swizzle(src_irb),
 558                            dst_mt, dst_level, dst_slice,
 559                            dst_image->TexFormat,
 560                            srcX0, srcY0, srcX1, srcY1,
 561                            dstX0, dstY0, dstX1, dstY1,
 562                            GL_NEAREST, false, mirror_y,
 563                            false, false);
 564
 565    /* If we're copying to a packed depth stencil texture and the source
 566     * framebuffer has separate stencil, we need to also copy the stencil data
 567     * over.
 568     */
 569    src_rb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 570    if (_mesa_get_format_bits(dst_image->TexFormat, GL_STENCIL_BITS) > 0 &&
 571        src_rb != NULL) {
 572       src_irb = intel_renderbuffer(src_rb);
 573       src_mt = src_irb->mt;
 574
 575       if (src_mt->stencil_mt)
 576          src_mt = src_mt->stencil_mt;
 577       if (dst_mt->stencil_mt)
 578          dst_mt = dst_mt->stencil_mt;
 579
 580       if (src_mt != dst_mt) {
 581          brw_blorp_blit_miptrees(brw,
 582                                  src_mt, src_irb->mt_level, src_irb->mt_layer,
 583                                  src_mt->format,
 584                                  blorp_get_texture_swizzle(src_irb),
 585                                  dst_mt, dst_level, dst_slice,
 586                                  dst_mt->format,
 587                                  srcX0, srcY0, srcX1, srcY1,
 588                                  dstX0, dstY0, dstX1, dstY1,
 589                                  GL_NEAREST, false, mirror_y,
 590                                  false, false);
 591       }
 592    }
 593
 594    return true;
 595 }
 596
 597
 598 GLbitfield
 599 brw_blorp_framebuffer(struct brw_context *brw,
 600                       struct gl_framebuffer *readFb,
 601                       struct gl_framebuffer *drawFb,
 602                       GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
 603                       GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
 604                       GLbitfield mask, GLenum filter)
 605 {
 606    /* BLORP is not supported before Gen6. */
 607    if (brw->gen < 6)
 608       return mask;
 609
 610    static GLbitfield buffer_bits[] = {
 611       GL_COLOR_BUFFER_BIT,
 612       GL_DEPTH_BUFFER_BIT,
 613       GL_STENCIL_BUFFER_BIT,
 614    };
 615
 616    for (unsigned int i = 0; i < ARRAY_SIZE(buffer_bits); ++i) {
 617       if ((mask & buffer_bits[i]) &&
 618        try_blorp_blit(brw, readFb, drawFb,
 619                       srcX0, srcY0, srcX1, srcY1,
 620                       dstX0, dstY0, dstX1, dstY1,
 621                       filter, buffer_bits[i])) {
 622          mask &= ~buffer_bits[i];
 623       }
 624    }
 625
 626    return mask;
 627 }
 628
 629 static bool
 630 set_write_disables(const struct intel_renderbuffer *irb,
 631                    const GLubyte *color_mask, bool *color_write_disable)
 632 {
 633    /* Format information in the renderbuffer represents the requirements
 634     * given by the client. There are cases where the backing miptree uses,
 635     * for example, RGBA to represent RGBX. Since the client is only expecting
 636     * RGB we can treat alpha as not used and write whatever we like into it.
 637     */
 638    const GLenum base_format = irb->Base.Base._BaseFormat;
 639    const int components = _mesa_base_format_component_count(base_format);
 640    bool disables = false;
 641
 642    assert(components > 0);
 643
 644    for (int i = 0; i < components; i++) {
 645       color_write_disable[i] = !color_mask[i];
 646       disables = disables || !color_mask[i];
 647    }
 648
 649    return disables;
 650 }
 651
 652 static bool
 653 do_single_blorp_clear(struct brw_context *brw, struct gl_framebuffer *fb,
 654                       struct gl_renderbuffer *rb, unsigned buf,
 655                       bool partial_clear, bool encode_srgb, unsigned layer)
 656 {
 657    struct gl_context *ctx = &brw->ctx;
 658    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 659    mesa_format format = irb->mt->format;
 660    uint32_t x0, x1, y0, y1;
 661
 662    if (!encode_srgb && _mesa_get_format_color_encoding(format) == GL_SRGB)
 663       format = _mesa_get_srgb_format_linear(format);
 664
 665    x0 = fb->_Xmin;
 666    x1 = fb->_Xmax;
 667    if (rb->Name != 0) {
 668       y0 = fb->_Ymin;
 669       y1 = fb->_Ymax;
 670    } else {
 671       y0 = rb->Height - fb->_Ymax;
 672       y1 = rb->Height - fb->_Ymin;
 673    }
 674
 675    /* If the clear region is empty, just return. */
 676    if (x0 == x1 || y0 == y1)
 677       return true;
 678
 679    bool can_fast_clear = !partial_clear;
 680
 681    bool color_write_disable[4] = { false, false, false, false };
 682    if (set_write_disables(irb, ctx->Color.ColorMask[buf], color_write_disable))
 683       can_fast_clear = false;
 684
 685    if (irb->mt->fast_clear_state == INTEL_FAST_CLEAR_STATE_NO_MCS ||
 686        !brw_is_color_fast_clear_compatible(brw, irb->mt, &ctx->Color.ClearColor))
 687       can_fast_clear = false;
 688
 689    if (can_fast_clear) {
 690       /* Record the clear color in the miptree so that it will be
 691        * programmed in SURFACE_STATE by later rendering and resolve
 692        * operations.
 693        */
 694       const bool color_updated = brw_meta_set_fast_clear_color(
 695                                     brw, irb->mt, &ctx->Color.ClearColor);
 696
 697       /* If the buffer is already in INTEL_FAST_CLEAR_STATE_CLEAR, the clear
 698        * is redundant and can be skipped.
 699        */
 700       if (!color_updated &&
 701           irb->mt->fast_clear_state == INTEL_FAST_CLEAR_STATE_CLEAR)
 702          return true;
 703
 704       /* If the MCS buffer hasn't been allocated yet, we need to allocate
 705        * it now.
 706        */
 707       if (!irb->mt->mcs_mt) {
 708          if (!intel_miptree_alloc_non_msrt_mcs(brw, irb->mt)) {
 709             /* MCS allocation failed--probably this will only happen in
 710              * out-of-memory conditions.  But in any case, try to recover
 711              * by falling back to a non-blorp clear technique.
 712              */
 713             return false;
 714          }
 715       }
 716    }
 717
 718    intel_miptree_check_level_layer(irb->mt, irb->mt_level, layer);
 719    intel_miptree_used_for_rendering(irb->mt);
 720
 721    /* We can't setup the blorp_surf until we've allocated the MCS above */
 722    struct isl_surf isl_tmp[2];
 723    struct brw_blorp_surf surf;
 724    unsigned level = irb->mt_level;
 725    brw_blorp_surf_for_miptree(brw, &surf, irb->mt, true, &level, isl_tmp);
 726
 727    if (can_fast_clear) {
 728       DBG("%s (fast) to mt %p level %d layer %d\n", __FUNCTION__,
 729           irb->mt, irb->mt_level, irb->mt_layer);
 730
 731       blorp_fast_clear(brw, &surf, level, layer, x0, y0, x1, y1);
 732
 733       /* Now that the fast clear has occurred, put the buffer in
 734        * INTEL_FAST_CLEAR_STATE_CLEAR so that we won't waste time doing
 735        * redundant clears.
 736        */
 737       irb->mt->fast_clear_state = INTEL_FAST_CLEAR_STATE_CLEAR;
 738    } else {
 739       DBG("%s (slow) to mt %p level %d layer %d\n", __FUNCTION__,
 740           irb->mt, irb->mt_level, irb->mt_layer);
 741
 742       union isl_color_value clear_color;
 743       memcpy(clear_color.f32, ctx->Color.ClearColor.f, sizeof(float) * 4);
 744
 745       blorp_clear(brw, &surf, level, layer, x0, y0, x1, y1,
 746                   (enum isl_format)brw->render_target_format[format],
 747                   clear_color, color_write_disable);
 748
 749       if (intel_miptree_is_lossless_compressed(brw, irb->mt)) {
 750          /* Compressed buffers can be cleared also using normal rep-clear. In
 751           * such case they bahave such as if they were drawn using normal 3D
 752           * render pipeline, and we simply mark the mcs as dirty.
 753           */
 754          assert(partial_clear);
 755          irb->mt->fast_clear_state = INTEL_FAST_CLEAR_STATE_UNRESOLVED;
 756       }
 757    }
 758
 759    return true;
 760 }
 761
 762 bool
 763 brw_blorp_clear_color(struct brw_context *brw, struct gl_framebuffer *fb,
 764                       GLbitfield mask, bool partial_clear, bool encode_srgb)
 765 {
 766    for (unsigned buf = 0; buf < fb->_NumColorDrawBuffers; buf++) {
 767       struct gl_renderbuffer *rb = fb->_ColorDrawBuffers[buf];
 768       struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 769
 770       /* Only clear the buffers present in the provided mask */
 771       if (((1 << fb->_ColorDrawBufferIndexes[buf]) & mask) == 0)
 772          continue;
 773
 774       /* If this is an ES2 context or GL_ARB_ES2_compatibility is supported,
 775        * the framebuffer can be complete with some attachments missing.  In
 776        * this case the _ColorDrawBuffers pointer will be NULL.
 777        */
 778       if (rb == NULL)
 779          continue;
 780
 781       if (fb->MaxNumLayers > 0) {
 782          unsigned layer_multiplier =
 783             (irb->mt->msaa_layout == INTEL_MSAA_LAYOUT_UMS ||
 784              irb->mt->msaa_layout == INTEL_MSAA_LAYOUT_CMS) ?
 785             irb->mt->num_samples : 1;
 786          unsigned num_layers = irb->layer_count;
 787          for (unsigned layer = 0; layer < num_layers; layer++) {
 788             if (!do_single_blorp_clear(
 789                     brw, fb, rb, buf, partial_clear, encode_srgb,
 790                     irb->mt_layer + layer * layer_multiplier)) {
 791                return false;
 792             }
 793          }
 794       } else {
 795          unsigned layer = irb->mt_layer;
 796          if (!do_single_blorp_clear(brw, fb, rb, buf, partial_clear,
 797                                     encode_srgb, layer))
 798             return false;
 799       }
 800
 801       irb->need_downsample = true;
 802    }
 803
 804    return true;
 805 }
 806
 807 void
 808 brw_blorp_resolve_color(struct brw_context *brw, struct intel_mipmap_tree *mt)
 809 {
 810    DBG("%s to mt %p\n", __FUNCTION__, mt);
 811
 812    const mesa_format format = _mesa_get_srgb_format_linear(mt->format);
 813
 814    intel_miptree_check_level_layer(mt, 0 /* level */, 0 /* layer */);
 815    intel_miptree_used_for_rendering(mt);
 816
 817    struct isl_surf isl_tmp[2];
 818    struct brw_blorp_surf surf;
 819    unsigned level = 0;
 820    brw_blorp_surf_for_miptree(brw, &surf, mt, true, &level, isl_tmp);
 821
 822    brw_blorp_ccs_resolve(brw, &surf, brw_blorp_to_isl_format(brw, format, true));
 823
 824    mt->fast_clear_state = INTEL_FAST_CLEAR_STATE_RESOLVED;
 825 }
 826
 827 static void
 828 gen6_blorp_hiz_exec(struct brw_context *brw, struct intel_mipmap_tree *mt,
 829                     unsigned int level, unsigned int layer, enum gen6_hiz_op op)
 830 {
 831    intel_miptree_check_level_layer(mt, level, layer);
 832    intel_miptree_used_for_rendering(mt);
 833
 834    assert(intel_miptree_level_has_hiz(mt, level));
 835
 836    struct isl_surf isl_tmp[2];
 837    struct brw_blorp_surf surf;
 838    brw_blorp_surf_for_miptree(brw, &surf, mt, true, &level, isl_tmp);
 839
 840    blorp_gen6_hiz_op(brw, &surf, level, layer, op);
 841 }
 842
 843 /**
 844  * Perform a HiZ or depth resolve operation.
 845  *
 846  * For an overview of HiZ ops, see the following sections of the Sandy Bridge
 847  * PRM, Volume 1, Part 2:
 848  *   - 7.5.3.1 Depth Buffer Clear
 849  *   - 7.5.3.2 Depth Buffer Resolve
 850  *   - 7.5.3.3 Hierarchical Depth Buffer Resolve
 851  */
 852 void
 853 intel_hiz_exec(struct brw_context *brw, struct intel_mipmap_tree *mt,
 854                unsigned int level, unsigned int layer, enum gen6_hiz_op op)
 855 {
 856    const char *opname = NULL;
 857
 858    switch (op) {
 859    case GEN6_HIZ_OP_DEPTH_RESOLVE:
 860       opname = "depth resolve";
 861       break;
 862    case GEN6_HIZ_OP_HIZ_RESOLVE:
 863       opname = "hiz ambiguate";
 864       break;
 865    case GEN6_HIZ_OP_DEPTH_CLEAR:
 866       opname = "depth clear";
 867       break;
 868    case GEN6_HIZ_OP_NONE:
 869       opname = "noop?";
 870       break;
 871    }
 872
 873    DBG("%s %s to mt %p level %d layer %d\n",
 874        __func__, opname, mt, level, layer);
 875
 876    if (brw->gen >= 8) {
 877       gen8_hiz_exec(brw, mt, level, layer, op);
 878    } else {
 879       gen6_blorp_hiz_exec(brw, mt, level, layer, op);
 880    }
 881 }