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/*
* Copyright © 2012 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.
*/
#include "intel_batchbuffer.h"
#include "brw_context.h"
#include "brw_defines.h"
#include "brw_multisample_state.h"
#include "main/framebuffer.h"
void
gen6_get_sample_position(struct gl_context *ctx,
struct gl_framebuffer *fb,
GLuint index, GLfloat *result)
{
uint8_t bits;
switch (_mesa_geometric_samples(fb)) {
case 1:
result[0] = result[1] = 0.5f;
return;
case 2:
bits = brw_multisample_positions_1x_2x >> (8 * index);
break;
case 4:
bits = brw_multisample_positions_4x >> (8 * index);
break;
case 8:
bits = brw_multisample_positions_8x[index >> 2] >> (8 * (index & 3));
break;
default:
unreachable("Not implemented");
}
/* Convert from U0.4 back to a floating point coordinate. */
result[0] = ((bits >> 4) & 0xf) / 16.0f;
result[1] = (bits & 0xf) / 16.0f;
}
/**
* Sample index layout shows the numbering of slots in a rectangular
* grid of samples with in a pixel. Sample number layout shows the
* rectangular grid of samples roughly corresponding to the real sample
* locations with in a pixel. Sample number layout matches the sample
* index layout in case of 2X and 4x MSAA, but they are different in
* case of 8X MSAA.
*
* 2X MSAA sample index / number layout
* ---------
* | 0 | 1 |
* ---------
*
* 4X MSAA sample index / number layout
* ---------
* | 0 | 1 |
* ---------
* | 2 | 3 |
* ---------
*
* 8X MSAA sample index layout 8x MSAA sample number layout
* --------- ---------
* | 0 | 1 | | 5 | 2 |
* --------- ---------
* | 2 | 3 | | 4 | 6 |
* --------- ---------
* | 4 | 5 | | 0 | 3 |
* --------- ---------
* | 6 | 7 | | 7 | 1 |
* --------- ---------
*
* A sample map is used to map sample indices to sample numbers.
*/
void
gen6_set_sample_maps(struct gl_context *ctx)
{
uint8_t map_2x[2] = {0, 1};
uint8_t map_4x[4] = {0, 1, 2, 3};
uint8_t map_8x[8] = {5, 2, 4, 6, 0, 3, 7, 1};
memcpy(ctx->Const.SampleMap2x, map_2x, sizeof(map_2x));
memcpy(ctx->Const.SampleMap4x, map_4x, sizeof(map_4x));
memcpy(ctx->Const.SampleMap8x, map_8x, sizeof(map_8x));
}
/**
* 3DSTATE_MULTISAMPLE
*/
void
gen6_emit_3dstate_multisample(struct brw_context *brw,
unsigned num_samples)
{
uint32_t number_of_multisamples = 0;
uint32_t sample_positions_3210 = 0;
uint32_t sample_positions_7654 = 0;
assert(brw->gen < 8);
switch (num_samples) {
case 0:
case 1:
number_of_multisamples = MS_NUMSAMPLES_1;
break;
case 4:
number_of_multisamples = MS_NUMSAMPLES_4;
sample_positions_3210 = brw_multisample_positions_4x;
break;
case 8:
number_of_multisamples = MS_NUMSAMPLES_8;
sample_positions_3210 = brw_multisample_positions_8x[0];
sample_positions_7654 = brw_multisample_positions_8x[1];
break;
default:
unreachable("Unrecognized num_samples in gen6_emit_3dstate_multisample");
}
int len = brw->gen >= 7 ? 4 : 3;
BEGIN_BATCH(len);
OUT_BATCH(_3DSTATE_MULTISAMPLE << 16 | (len - 2));
OUT_BATCH(MS_PIXEL_LOCATION_CENTER | number_of_multisamples);
OUT_BATCH(sample_positions_3210);
if (brw->gen >= 7)
OUT_BATCH(sample_positions_7654);
ADVANCE_BATCH();
}
unsigned
gen6_determine_sample_mask(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
float coverage = 1.0f;
float coverage_invert = false;
unsigned sample_mask = ~0u;
/* BRW_NEW_NUM_SAMPLES */
unsigned num_samples = brw->num_samples;
if (ctx->Multisample._Enabled) {
if (ctx->Multisample.SampleCoverage) {
coverage = ctx->Multisample.SampleCoverageValue;
coverage_invert = ctx->Multisample.SampleCoverageInvert;
}
if (ctx->Multisample.SampleMask) {
sample_mask = ctx->Multisample.SampleMaskValue;
}
}
if (num_samples > 1) {
int coverage_int = (int) (num_samples * coverage + 0.5f);
uint32_t coverage_bits = (1 << coverage_int) - 1;
if (coverage_invert)
coverage_bits ^= (1 << num_samples) - 1;
return coverage_bits & sample_mask;
} else {
return 1;
}
}
/**
* 3DSTATE_SAMPLE_MASK
*/
void
gen6_emit_3dstate_sample_mask(struct brw_context *brw, unsigned mask)
{
BEGIN_BATCH(2);
OUT_BATCH(_3DSTATE_SAMPLE_MASK << 16 | (2 - 2));
OUT_BATCH(mask);
ADVANCE_BATCH();
}
static void
upload_multisample_state(struct brw_context *brw)
{
/* BRW_NEW_NUM_SAMPLES */
gen6_emit_3dstate_multisample(brw, brw->num_samples);
gen6_emit_3dstate_sample_mask(brw, gen6_determine_sample_mask(brw));
}
const struct brw_tracked_state gen6_multisample_state = {
.dirty = {
.mesa = _NEW_MULTISAMPLE,
.brw = BRW_NEW_CONTEXT |
BRW_NEW_NUM_SAMPLES,
},
.emit = upload_multisample_state
};
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