| /* |
| * Copyright © 2014 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| * |
| * Authors: |
| * Neil Roberts <neil@linux.intel.com> |
| */ |
| |
| /** @file brw_conditional_render.c |
| * |
| * Support for conditional rendering based on query objects |
| * (GL_NV_conditional_render, GL_ARB_conditional_render_inverted) on Gen7+. |
| */ |
| |
| #include "main/imports.h" |
| #include "main/condrender.h" |
| |
| #include "brw_context.h" |
| #include "brw_defines.h" |
| #include "intel_batchbuffer.h" |
| |
| static void |
| set_predicate_enable(struct brw_context *brw, |
| bool value) |
| { |
| if (value) |
| brw->predicate.state = BRW_PREDICATE_STATE_RENDER; |
| else |
| brw->predicate.state = BRW_PREDICATE_STATE_DONT_RENDER; |
| } |
| |
| static void |
| set_predicate_for_result(struct brw_context *brw, |
| struct brw_query_object *query, |
| bool inverted) |
| { |
| int load_op; |
| |
| assert(query->bo != NULL); |
| |
| brw_load_register_mem64(brw, |
| MI_PREDICATE_SRC0, |
| query->bo, |
| I915_GEM_DOMAIN_INSTRUCTION, |
| 0, /* write domain */ |
| 0 /* offset */); |
| brw_load_register_mem64(brw, |
| MI_PREDICATE_SRC1, |
| query->bo, |
| I915_GEM_DOMAIN_INSTRUCTION, |
| 0, /* write domain */ |
| 8 /* offset */); |
| |
| if (inverted) |
| load_op = MI_PREDICATE_LOADOP_LOAD; |
| else |
| load_op = MI_PREDICATE_LOADOP_LOADINV; |
| |
| BEGIN_BATCH(1); |
| OUT_BATCH(GEN7_MI_PREDICATE | |
| load_op | |
| MI_PREDICATE_COMBINEOP_SET | |
| MI_PREDICATE_COMPAREOP_SRCS_EQUAL); |
| ADVANCE_BATCH(); |
| |
| brw->predicate.state = BRW_PREDICATE_STATE_USE_BIT; |
| } |
| |
| static void |
| brw_begin_conditional_render(struct gl_context *ctx, |
| struct gl_query_object *q, |
| GLenum mode) |
| { |
| struct brw_context *brw = brw_context(ctx); |
| struct brw_query_object *query = (struct brw_query_object *) q; |
| bool inverted; |
| |
| if (!brw->predicate.supported) |
| return; |
| |
| switch (mode) { |
| case GL_QUERY_WAIT: |
| case GL_QUERY_NO_WAIT: |
| case GL_QUERY_BY_REGION_WAIT: |
| case GL_QUERY_BY_REGION_NO_WAIT: |
| inverted = false; |
| break; |
| case GL_QUERY_WAIT_INVERTED: |
| case GL_QUERY_NO_WAIT_INVERTED: |
| case GL_QUERY_BY_REGION_WAIT_INVERTED: |
| case GL_QUERY_BY_REGION_NO_WAIT_INVERTED: |
| inverted = true; |
| break; |
| default: |
| unreachable("Unexpected conditional render mode"); |
| } |
| |
| /* If there are already samples from a BLT operation or if the query object |
| * is ready then we can avoid looking at the values in the buffer and just |
| * decide whether to draw using the CPU without stalling. |
| */ |
| if (query->Base.Result || query->Base.Ready) |
| set_predicate_enable(brw, (query->Base.Result != 0) ^ inverted); |
| else |
| set_predicate_for_result(brw, query, inverted); |
| } |
| |
| static void |
| brw_end_conditional_render(struct gl_context *ctx, |
| struct gl_query_object *q) |
| { |
| struct brw_context *brw = brw_context(ctx); |
| |
| /* When there is no longer a conditional render in progress it should |
| * always render. |
| */ |
| brw->predicate.state = BRW_PREDICATE_STATE_RENDER; |
| } |
| |
| void |
| brw_init_conditional_render_functions(struct dd_function_table *functions) |
| { |
| functions->BeginConditionalRender = brw_begin_conditional_render; |
| functions->EndConditionalRender = brw_end_conditional_render; |
| } |
| |
| bool |
| brw_check_conditional_render(struct brw_context *brw) |
| { |
| if (brw->predicate.supported) { |
| /* In some cases it is possible to determine that the primitives should |
| * be skipped without needing the predicate enable bit and still without |
| * stalling. |
| */ |
| return brw->predicate.state != BRW_PREDICATE_STATE_DONT_RENDER; |
| } else if (brw->ctx.Query.CondRenderQuery) { |
| perf_debug("Conditional rendering is implemented in software and may " |
| "stall.\n"); |
| return _mesa_check_conditional_render(&brw->ctx); |
| } else { |
| return true; |
| } |
| } |