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/*
* 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_overflow_query(struct brw_context *brw,
struct brw_query_object *query,
int stream_start, int count)
{
if (!can_do_mi_math_and_lrr(brw->screen)) {
brw->predicate.state = BRW_PREDICATE_STATE_STALL_FOR_QUERY;
return;
}
brw->predicate.state = BRW_PREDICATE_STATE_USE_BIT;
/* Needed to ensure the memory is coherent for the MI_LOAD_REGISTER_MEM
* command when loading the values into the predicate source registers for
* conditional rendering.
*/
brw_emit_pipe_control_flush(brw, PIPE_CONTROL_FLUSH_ENABLE);
hsw_overflow_result_to_gpr0(brw, query, count);
brw_load_register_reg64(brw, HSW_CS_GPR(0), MI_PREDICATE_SRC0);
brw_load_register_imm64(brw, MI_PREDICATE_SRC1, 0ull);
}
static void
set_predicate_for_occlusion_query(struct brw_context *brw,
struct brw_query_object *query)
{
if (!brw->predicate.supported) {
brw->predicate.state = BRW_PREDICATE_STATE_STALL_FOR_QUERY;
return;
}
brw->predicate.state = BRW_PREDICATE_STATE_USE_BIT;
/* Needed to ensure the memory is coherent for the MI_LOAD_REGISTER_MEM
* command when loading the values into the predicate source registers for
* conditional rendering.
*/
brw_emit_pipe_control_flush(brw, PIPE_CONTROL_FLUSH_ENABLE);
brw_load_register_mem64(brw, MI_PREDICATE_SRC0, query->bo, 0 /* offset */);
brw_load_register_mem64(brw, MI_PREDICATE_SRC1, query->bo, 8 /* offset */);
}
static void
set_predicate_for_result(struct brw_context *brw,
struct brw_query_object *query,
bool inverted)
{
int load_op;
assert(query->bo != NULL);
switch (query->Base.Target) {
case GL_TRANSFORM_FEEDBACK_STREAM_OVERFLOW_ARB:
set_predicate_for_overflow_query(brw, query, 0, 1);
break;
case GL_TRANSFORM_FEEDBACK_OVERFLOW_ARB:
set_predicate_for_overflow_query(brw, query, 0, MAX_VERTEX_STREAMS);
break;
default:
set_predicate_for_occlusion_query(brw, query);
}
if (brw->predicate.state == BRW_PREDICATE_STATE_USE_BIT) {
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();
}
}
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;
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.state == BRW_PREDICATE_STATE_STALL_FOR_QUERY) {
perf_debug("Conditional rendering is implemented in software and may "
"stall.\n");
return _mesa_check_conditional_render(&brw->ctx);
}
return brw->predicate.state != BRW_PREDICATE_STATE_DONT_RENDER;
}
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