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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;
case 16:
bits = brw_multisample_positions_16x[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 |
* --------- ---------
*
* 16X MSAA sample index layout 16x MSAA sample number layout
* ----------------- -----------------
* | 0 | 1 | 2 | 3 | |15 |10 | 9 | 7 |
* ----------------- -----------------
* | 4 | 5 | 6 | 7 | | 4 | 1 | 3 |13 |
* ----------------- -----------------
* | 8 | 9 |10 |11 | |12 | 2 | 0 | 6 |
* ----------------- -----------------
* |12 |13 |14 |15 | |11 | 8 | 5 |14 |
* ----------------- -----------------
*
* 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] = {3, 7, 5, 0, 1, 2, 4, 6};
uint8_t map_16x[16] = { 15, 10, 9, 7, 4, 1, 3, 13,
12, 2, 0, 6, 11, 8, 5, 14 };
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));
memcpy(ctx->Const.SampleMap16x, map_16x, sizeof(map_16x));
}
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