1/* 2 * Copyright 2008 Corbin Simpson <MostAwesomeDude@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 "draw/draw_context.h" 24 25#include "util/u_memory.h" 26#include "util/u_sampler.h" 27#include "util/u_upload_mgr.h" 28#include "util/os_time.h" 29#include "vl/vl_decoder.h" 30#include "vl/vl_video_buffer.h" 31 32#include "r300_cb.h" 33#include "r300_context.h" 34#include "r300_emit.h" 35#include "r300_screen.h" 36#include "r300_screen_buffer.h" 37#include "compiler/radeon_regalloc.h" 38 39#include <inttypes.h> 40 41static void r300_release_referenced_objects(struct r300_context *r300) 42{ 43 struct pipe_framebuffer_state *fb = 44 (struct pipe_framebuffer_state*)r300->fb_state.state; 45 struct r300_textures_state *textures = 46 (struct r300_textures_state*)r300->textures_state.state; 47 unsigned i; 48 49 /* Framebuffer state. */ 50 util_unreference_framebuffer_state(fb); 51 52 /* Textures. */ 53 for (i = 0; i < textures->sampler_view_count; i++) 54 pipe_sampler_view_reference( 55 (struct pipe_sampler_view**)&textures->sampler_views[i], NULL); 56 57 /* The special dummy texture for texkill. */ 58 if (r300->texkill_sampler) { 59 pipe_sampler_view_reference( 60 (struct pipe_sampler_view**)&r300->texkill_sampler, 61 NULL); 62 } 63 64 /* Manually-created vertex buffers. */ 65 pipe_vertex_buffer_unreference(&r300->dummy_vb); 66 pb_reference(&r300->vbo, NULL); 67 68 r300->context.delete_depth_stencil_alpha_state(&r300->context, 69 r300->dsa_decompress_zmask); 70} 71 72static void r300_destroy_context(struct pipe_context* context) 73{ 74 struct r300_context* r300 = r300_context(context); 75 76 if (r300->cs.priv && r300->hyperz_enabled) { 77 r300->rws->cs_request_feature(&r300->cs, RADEON_FID_R300_HYPERZ_ACCESS, FALSE); 78 } 79 if (r300->cs.priv && r300->cmask_access) { 80 r300->rws->cs_request_feature(&r300->cs, RADEON_FID_R300_CMASK_ACCESS, FALSE); 81 } 82 83 if (r300->blitter) 84 util_blitter_destroy(r300->blitter); 85 if (r300->draw) 86 draw_destroy(r300->draw); 87 88 if (r300->uploader) 89 u_upload_destroy(r300->uploader); 90 if (r300->context.stream_uploader) 91 u_upload_destroy(r300->context.stream_uploader); 92 93 /* XXX: This function assumes r300->query_list was initialized */ 94 r300_release_referenced_objects(r300); 95 96 r300->rws->cs_destroy(&r300->cs); 97 if (r300->ctx) 98 r300->rws->ctx_destroy(r300->ctx); 99 100 rc_destroy_regalloc_state(&r300->fs_regalloc_state); 101 102 /* XXX: No way to tell if this was initialized or not? */ 103 slab_destroy_child(&r300->pool_transfers); 104 105 /* Free the structs allocated in r300_setup_atoms() */ 106 if (r300->aa_state.state) { 107 FREE(r300->aa_state.state); 108 FREE(r300->blend_color_state.state); 109 FREE(r300->clip_state.state); 110 FREE(r300->fb_state.state); 111 FREE(r300->gpu_flush.state); 112 FREE(r300->hyperz_state.state); 113 FREE(r300->invariant_state.state); 114 FREE(r300->rs_block_state.state); 115 FREE(r300->sample_mask.state); 116 FREE(r300->scissor_state.state); 117 FREE(r300->textures_state.state); 118 FREE(r300->vap_invariant_state.state); 119 FREE(r300->viewport_state.state); 120 FREE(r300->ztop_state.state); 121 FREE(r300->fs_constants.state); 122 FREE(r300->vs_constants.state); 123 if (!r300->screen->caps.has_tcl) { 124 FREE(r300->vertex_stream_state.state); 125 } 126 } 127 FREE(r300); 128} 129 130static void r300_flush_callback(void *data, unsigned flags, 131 struct pipe_fence_handle **fence) 132{ 133 struct r300_context* const cs_context_copy = data; 134 135 r300_flush(&cs_context_copy->context, flags, fence); 136} 137 138#define R300_INIT_ATOM(atomname, atomsize) \ 139 do { \ 140 r300->atomname.name = #atomname; \ 141 r300->atomname.state = NULL; \ 142 r300->atomname.size = atomsize; \ 143 r300->atomname.emit = r300_emit_##atomname; \ 144 r300->atomname.dirty = FALSE; \ 145 } while (0) 146 147#define R300_ALLOC_ATOM(atomname, statetype) \ 148do { \ 149 r300->atomname.state = CALLOC_STRUCT(statetype); \ 150 if (r300->atomname.state == NULL) \ 151 return FALSE; \ 152} while (0) 153 154static boolean r300_setup_atoms(struct r300_context* r300) 155{ 156 boolean is_rv350 = r300->screen->caps.is_rv350; 157 boolean is_r500 = r300->screen->caps.is_r500; 158 boolean has_tcl = r300->screen->caps.has_tcl; 159 160 /* Create the actual atom list. 161 * 162 * Some atoms never change size, others change every emit - those have 163 * the size of 0 here. 164 * 165 * NOTE: The framebuffer state is split into these atoms: 166 * - gpu_flush (unpipelined regs) 167 * - aa_state (unpipelined regs) 168 * - fb_state (unpipelined regs) 169 * - hyperz_state (unpipelined regs followed by pipelined ones) 170 * - fb_state_pipelined (pipelined regs) 171 * The motivation behind this is to be able to emit a strict 172 * subset of the regs, and to have reasonable register ordering. */ 173 /* SC, GB (unpipelined), RB3D (unpipelined), ZB (unpipelined). */ 174 R300_INIT_ATOM(gpu_flush, 9); 175 R300_INIT_ATOM(aa_state, 4); 176 R300_INIT_ATOM(fb_state, 0); 177 R300_INIT_ATOM(hyperz_state, is_r500 || is_rv350 ? 10 : 8); 178 /* ZB (unpipelined), SC. */ 179 R300_INIT_ATOM(ztop_state, 2); 180 /* ZB, FG. */ 181 R300_INIT_ATOM(dsa_state, is_r500 ? 10 : 6); 182 /* RB3D. */ 183 R300_INIT_ATOM(blend_state, 8); 184 R300_INIT_ATOM(blend_color_state, is_r500 ? 3 : 2); 185 /* SC. */ 186 R300_INIT_ATOM(sample_mask, 2); 187 R300_INIT_ATOM(scissor_state, 3); 188 /* GB, FG, GA, SU, SC, RB3D. */ 189 R300_INIT_ATOM(invariant_state, 14 + (is_rv350 ? 4 : 0) + (is_r500 ? 4 : 0)); 190 /* VAP. */ 191 R300_INIT_ATOM(viewport_state, 9); 192 R300_INIT_ATOM(pvs_flush, 2); 193 R300_INIT_ATOM(vap_invariant_state, is_r500 || !has_tcl ? 11 : 9); 194 R300_INIT_ATOM(vertex_stream_state, 0); 195 R300_INIT_ATOM(vs_state, 0); 196 R300_INIT_ATOM(vs_constants, 0); 197 R300_INIT_ATOM(clip_state, has_tcl ? 3 + (6 * 4) : 0); 198 /* VAP, RS, GA, GB, SU, SC. */ 199 R300_INIT_ATOM(rs_block_state, 0); 200 R300_INIT_ATOM(rs_state, 0); 201 /* SC, US. */ 202 R300_INIT_ATOM(fb_state_pipelined, 8); 203 /* US. */ 204 R300_INIT_ATOM(fs, 0); 205 R300_INIT_ATOM(fs_rc_constant_state, 0); 206 R300_INIT_ATOM(fs_constants, 0); 207 /* TX. */ 208 R300_INIT_ATOM(texture_cache_inval, 2); 209 R300_INIT_ATOM(textures_state, 0); 210 /* Clear commands */ 211 R300_INIT_ATOM(hiz_clear, r300->screen->caps.hiz_ram > 0 ? 4 : 0); 212 R300_INIT_ATOM(zmask_clear, r300->screen->caps.zmask_ram > 0 ? 4 : 0); 213 R300_INIT_ATOM(cmask_clear, 4); 214 /* ZB (unpipelined), SU. */ 215 R300_INIT_ATOM(query_start, 4); 216 217 /* Replace emission functions for r500. */ 218 if (is_r500) { 219 r300->fs.emit = r500_emit_fs; 220 r300->fs_rc_constant_state.emit = r500_emit_fs_rc_constant_state; 221 r300->fs_constants.emit = r500_emit_fs_constants; 222 } 223 224 /* Some non-CSO atoms need explicit space to store the state locally. */ 225 R300_ALLOC_ATOM(aa_state, r300_aa_state); 226 R300_ALLOC_ATOM(blend_color_state, r300_blend_color_state); 227 R300_ALLOC_ATOM(clip_state, r300_clip_state); 228 R300_ALLOC_ATOM(hyperz_state, r300_hyperz_state); 229 R300_ALLOC_ATOM(invariant_state, r300_invariant_state); 230 R300_ALLOC_ATOM(textures_state, r300_textures_state); 231 R300_ALLOC_ATOM(vap_invariant_state, r300_vap_invariant_state); 232 R300_ALLOC_ATOM(viewport_state, r300_viewport_state); 233 R300_ALLOC_ATOM(ztop_state, r300_ztop_state); 234 R300_ALLOC_ATOM(fb_state, pipe_framebuffer_state); 235 R300_ALLOC_ATOM(gpu_flush, pipe_framebuffer_state); 236 r300->sample_mask.state = malloc(4); 237 R300_ALLOC_ATOM(scissor_state, pipe_scissor_state); 238 R300_ALLOC_ATOM(rs_block_state, r300_rs_block); 239 R300_ALLOC_ATOM(fs_constants, r300_constant_buffer); 240 R300_ALLOC_ATOM(vs_constants, r300_constant_buffer); 241 if (!r300->screen->caps.has_tcl) { 242 R300_ALLOC_ATOM(vertex_stream_state, r300_vertex_stream_state); 243 } 244 245 /* Some non-CSO atoms don't use the state pointer. */ 246 r300->fb_state_pipelined.allow_null_state = TRUE; 247 r300->fs_rc_constant_state.allow_null_state = TRUE; 248 r300->pvs_flush.allow_null_state = TRUE; 249 r300->query_start.allow_null_state = TRUE; 250 r300->texture_cache_inval.allow_null_state = TRUE; 251 252 /* Some states must be marked as dirty here to properly set up 253 * hardware in the first command stream. */ 254 r300_mark_atom_dirty(r300, &r300->invariant_state); 255 r300_mark_atom_dirty(r300, &r300->pvs_flush); 256 r300_mark_atom_dirty(r300, &r300->vap_invariant_state); 257 r300_mark_atom_dirty(r300, &r300->texture_cache_inval); 258 r300_mark_atom_dirty(r300, &r300->textures_state); 259 260 return TRUE; 261} 262 263/* Not every gallium frontend calls every driver function before the first draw 264 * call and we must initialize the command buffers somehow. */ 265static void r300_init_states(struct pipe_context *pipe) 266{ 267 struct r300_context *r300 = r300_context(pipe); 268 struct pipe_blend_color bc = {{0}}; 269 struct pipe_clip_state cs = {{{0}}}; 270 struct pipe_scissor_state ss = {0}; 271 struct r300_gpu_flush *gpuflush = 272 (struct r300_gpu_flush*)r300->gpu_flush.state; 273 struct r300_vap_invariant_state *vap_invariant = 274 (struct r300_vap_invariant_state*)r300->vap_invariant_state.state; 275 struct r300_invariant_state *invariant = 276 (struct r300_invariant_state*)r300->invariant_state.state; 277 278 CB_LOCALS; 279 280 pipe->set_blend_color(pipe, &bc); 281 pipe->set_clip_state(pipe, &cs); 282 pipe->set_scissor_states(pipe, 0, 1, &ss); 283 pipe->set_sample_mask(pipe, ~0); 284 285 /* Initialize the GPU flush. */ 286 { 287 BEGIN_CB(gpuflush->cb_flush_clean, 6); 288 289 /* Flush and free renderbuffer caches. */ 290 OUT_CB_REG(R300_RB3D_DSTCACHE_CTLSTAT, 291 R300_RB3D_DSTCACHE_CTLSTAT_DC_FREE_FREE_3D_TAGS | 292 R300_RB3D_DSTCACHE_CTLSTAT_DC_FLUSH_FLUSH_DIRTY_3D); 293 OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT, 294 R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE | 295 R300_ZB_ZCACHE_CTLSTAT_ZC_FREE_FREE); 296 297 /* Wait until the GPU is idle. 298 * This fixes random pixels sometimes appearing probably caused 299 * by incomplete rendering. */ 300 OUT_CB_REG(RADEON_WAIT_UNTIL, RADEON_WAIT_3D_IDLECLEAN); 301 END_CB; 302 } 303 304 /* Initialize the VAP invariant state. */ 305 { 306 BEGIN_CB(vap_invariant->cb, r300->vap_invariant_state.size); 307 OUT_CB_REG(VAP_PVS_VTX_TIMEOUT_REG, 0xffff); 308 OUT_CB_REG_SEQ(R300_VAP_GB_VERT_CLIP_ADJ, 4); 309 OUT_CB_32F(1.0); 310 OUT_CB_32F(1.0); 311 OUT_CB_32F(1.0); 312 OUT_CB_32F(1.0); 313 OUT_CB_REG(R300_VAP_PSC_SGN_NORM_CNTL, R300_SGN_NORM_NO_ZERO); 314 315 if (r300->screen->caps.is_r500) { 316 OUT_CB_REG(R500_VAP_TEX_TO_COLOR_CNTL, 0); 317 } else if (!r300->screen->caps.has_tcl) { 318 /* RSxxx: 319 * Static VAP setup since r300_emit_vs_state() is never called. 320 */ 321 OUT_CB_REG(R300_VAP_CNTL, R300_PVS_NUM_SLOTS(10) | 322 R300_PVS_NUM_CNTLRS(5) | 323 R300_PVS_NUM_FPUS(2) | 324 R300_PVS_VF_MAX_VTX_NUM(5)); 325 } 326 END_CB; 327 } 328 329 /* Initialize the invariant state. */ 330 { 331 BEGIN_CB(invariant->cb, r300->invariant_state.size); 332 OUT_CB_REG(R300_GB_SELECT, 0); 333 OUT_CB_REG(R300_FG_FOG_BLEND, 0); 334 OUT_CB_REG(R300_GA_OFFSET, 0); 335 OUT_CB_REG(R300_SU_TEX_WRAP, 0); 336 OUT_CB_REG(R300_SU_DEPTH_SCALE, 0x4B7FFFFF); 337 OUT_CB_REG(R300_SU_DEPTH_OFFSET, 0); 338 OUT_CB_REG(R300_SC_EDGERULE, 0x2DA49525); 339 340 if (r300->screen->caps.is_rv350) { 341 OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_LTE_THRESHOLD, 0x01010101); 342 OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_GTE_THRESHOLD, 0xFEFEFEFE); 343 } 344 345 if (r300->screen->caps.is_r500) { 346 OUT_CB_REG(R500_GA_COLOR_CONTROL_PS3, 0); 347 OUT_CB_REG(R500_SU_TEX_WRAP_PS3, 0); 348 } 349 END_CB; 350 } 351 352 /* Initialize the hyperz state. */ 353 { 354 struct r300_hyperz_state *hyperz = 355 (struct r300_hyperz_state*)r300->hyperz_state.state; 356 BEGIN_CB(&hyperz->cb_flush_begin, r300->hyperz_state.size); 357 OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT, 358 R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE); 359 OUT_CB_REG(R300_ZB_BW_CNTL, 0); 360 OUT_CB_REG(R300_ZB_DEPTHCLEARVALUE, 0); 361 OUT_CB_REG(R300_SC_HYPERZ, R300_SC_HYPERZ_ADJ_2); 362 363 if (r300->screen->caps.is_r500 || r300->screen->caps.is_rv350) { 364 OUT_CB_REG(R300_GB_Z_PEQ_CONFIG, 0); 365 } 366 END_CB; 367 } 368} 369 370static void 371r300_set_debug_callback(struct pipe_context *context, 372 const struct util_debug_callback *cb) 373{ 374 struct r300_context *r300 = r300_context(context); 375 376 if (cb) 377 r300->debug = *cb; 378 else 379 memset(&r300->debug, 0, sizeof(r300->debug)); 380} 381 382struct pipe_context* r300_create_context(struct pipe_screen* screen, 383 void *priv, unsigned flags) 384{ 385 struct r300_context* r300 = CALLOC_STRUCT(r300_context); 386 struct r300_screen* r300screen = r300_screen(screen); 387 struct radeon_winsys *rws = r300screen->rws; 388 389 if (!r300) 390 return NULL; 391 392 r300->rws = rws; 393 r300->screen = r300screen; 394 395 r300->context.screen = screen; 396 r300->context.priv = priv; 397 r300->context.set_debug_callback = r300_set_debug_callback; 398 399 r300->context.destroy = r300_destroy_context; 400 401 slab_create_child(&r300->pool_transfers, &r300screen->pool_transfers); 402 403 r300->ctx = rws->ctx_create(rws, RADEON_CTX_PRIORITY_MEDIUM); 404 if (!r300->ctx) 405 goto fail; 406 407 408 if (!rws->cs_create(&r300->cs, r300->ctx, AMD_IP_GFX, r300_flush_callback, r300, false)) 409 goto fail; 410 411 if (!r300screen->caps.has_tcl) { 412 /* Create a Draw. This is used for SW TCL. */ 413 r300->draw = draw_create(&r300->context); 414 if (r300->draw == NULL) 415 goto fail; 416 /* Enable our renderer. */ 417 draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300)); 418 /* Disable converting points/lines to triangles. */ 419 draw_wide_line_threshold(r300->draw, 10000000.f); 420 draw_wide_point_threshold(r300->draw, 10000000.f); 421 draw_wide_point_sprites(r300->draw, FALSE); 422 draw_enable_line_stipple(r300->draw, TRUE); 423 draw_enable_point_sprites(r300->draw, FALSE); 424 } 425 426 if (!r300_setup_atoms(r300)) 427 goto fail; 428 429 r300_init_blit_functions(r300); 430 r300_init_flush_functions(r300); 431 r300_init_query_functions(r300); 432 r300_init_state_functions(r300); 433 r300_init_resource_functions(r300); 434 r300_init_render_functions(r300); 435 r300_init_states(&r300->context); 436 437 r300->context.create_video_codec = vl_create_decoder; 438 r300->context.create_video_buffer = vl_video_buffer_create; 439 440 r300->uploader = u_upload_create(&r300->context, 128 * 1024, 441 PIPE_BIND_CUSTOM, PIPE_USAGE_STREAM, 0); 442 r300->context.stream_uploader = u_upload_create(&r300->context, 1024 * 1024, 443 0, PIPE_USAGE_STREAM, 0); 444 r300->context.const_uploader = u_upload_create(&r300->context, 1024 * 1024, 445 PIPE_BIND_CONSTANT_BUFFER, 446 PIPE_USAGE_STREAM, 0); 447 448 r300->blitter = util_blitter_create(&r300->context); 449 if (r300->blitter == NULL) 450 goto fail; 451 r300->blitter->draw_rectangle = r300_blitter_draw_rectangle; 452 453 /* The KIL opcode needs the first texture unit to be enabled 454 * on r3xx-r4xx. In order to calm down the CS checker, we bind this 455 * dummy texture there. */ 456 if (!r300->screen->caps.is_r500) { 457 struct pipe_resource *tex; 458 struct pipe_resource rtempl = {0}; 459 struct pipe_sampler_view vtempl = {0}; 460 461 rtempl.target = PIPE_TEXTURE_2D; 462 rtempl.format = PIPE_FORMAT_I8_UNORM; 463 rtempl.usage = PIPE_USAGE_IMMUTABLE; 464 rtempl.width0 = 1; 465 rtempl.height0 = 1; 466 rtempl.depth0 = 1; 467 tex = screen->resource_create(screen, &rtempl); 468 469 u_sampler_view_default_template(&vtempl, tex, tex->format); 470 471 r300->texkill_sampler = (struct r300_sampler_view*) 472 r300->context.create_sampler_view(&r300->context, tex, &vtempl); 473 474 pipe_resource_reference(&tex, NULL); 475 } 476 477 if (r300screen->caps.has_tcl) { 478 struct pipe_resource vb; 479 memset(&vb, 0, sizeof(vb)); 480 vb.target = PIPE_BUFFER; 481 vb.format = PIPE_FORMAT_R8_UNORM; 482 vb.usage = PIPE_USAGE_DEFAULT; 483 vb.width0 = sizeof(float) * 16; 484 vb.height0 = 1; 485 vb.depth0 = 1; 486 487 r300->dummy_vb.buffer.resource = screen->resource_create(screen, &vb); 488 r300->context.set_vertex_buffers(&r300->context, 0, 1, 0, false, &r300->dummy_vb); 489 } 490 491 { 492 struct pipe_depth_stencil_alpha_state dsa; 493 memset(&dsa, 0, sizeof(dsa)); 494 dsa.depth_writemask = 1; 495 496 r300->dsa_decompress_zmask = 497 r300->context.create_depth_stencil_alpha_state(&r300->context, 498 &dsa); 499 } 500 501 r300->hyperz_time_of_last_flush = os_time_get(); 502 503 /* Register allocator state */ 504 rc_init_regalloc_state(&r300->fs_regalloc_state); 505 506 /* Print driver info. */ 507#ifdef DEBUG 508 { 509#else 510 if (DBG_ON(r300, DBG_INFO)) { 511#endif 512 fprintf(stderr, 513 "r300: DRM version: %d.%d.%d, Name: %s, ID: 0x%04x, GB: %d, Z: %d\n" 514 "r300: GART size: %u MB, VRAM size: %u MB\n" 515 "r300: AA compression RAM: %s, Z compression RAM: %s, HiZ RAM: %s\n", 516 r300->screen->info.drm_major, 517 r300->screen->info.drm_minor, 518 r300->screen->info.drm_patchlevel, 519 screen->get_name(screen), 520 r300->screen->info.pci_id, 521 r300->screen->info.r300_num_gb_pipes, 522 r300->screen->info.r300_num_z_pipes, 523 r300->screen->info.gart_size_kb >> 10, 524 r300->screen->info.vram_size_kb >> 10, 525 "YES", /* XXX really? */ 526 r300->screen->caps.zmask_ram ? "YES" : "NO", 527 r300->screen->caps.hiz_ram ? "YES" : "NO"); 528 } 529 530 return &r300->context; 531 532fail: 533 r300_destroy_context(&r300->context); 534 return NULL; 535} 536