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https://github.com/elwrcl/intel-hard-graphics.git
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140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/*
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* Copyright (C) 2019 Collabora, Ltd.
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* SPDX-License-Identifier: MIT
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*/
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#include <stdint.h>
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#include "pan_samples.h"
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/* Sample positions are specified partially in hardware, partially in software
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* on Mali. On Midgard, sample positions are completely fixed but need to be
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* software accessible to implement gl_SamplePosition. On Bifrost, sample
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* positions are part fixed, part programmable, and again need to be accessible
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* for gl_SamplePosition. The mali_sample_position data structure is
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* hardware-defined on Bifrost as a packed 8:8 fixed point format. The
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* mali_sample_positions array is part-hardware, part-software-defined: it must
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* give the sample position when indexed by the sample index, as well as
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* reading back the origin when indexed by 32.
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*
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* The upshot is all of this is known at compile-time, so we can just hardcode
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* the LUT, upload it to GPU memory on device initialization, and forget about
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* it.
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*/
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struct mali_sample_position {
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uint16_t x, y;
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} __attribute__((packed));
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struct mali_sample_positions {
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struct mali_sample_position positions[32];
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struct mali_sample_position origin;
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struct mali_sample_position padding[64 - (32 + 1)];
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} __attribute__((packed));
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/* SAMPLE16 constructs a single sample in terms of 1/16's of the grid, centered
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* at the origin. SAMPLE4/8 swap the units for legibility. */
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#define SAMPLE16(x, y) \
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{ \
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(((x) + 8) * (256 / 16)), (((y) + 8) * (256 / 16)) \
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}
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#define SAMPLE8(x, y) SAMPLE16((x)*2, (y)*2)
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#define SAMPLE4(x, y) SAMPLE16((x)*4, (y)*4)
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/* clang-format off */
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const struct mali_sample_positions sample_position_lut[] = {
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[MALI_SAMPLE_PATTERN_SINGLE_SAMPLED] = {
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.positions = {
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SAMPLE4(0, 0)
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},
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.origin = SAMPLE4(0, 0)
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},
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[MALI_SAMPLE_PATTERN_ORDERED_4X_GRID] = {
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.positions = {
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SAMPLE4(-1, -1),
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SAMPLE4( 1, -1),
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SAMPLE4(-1, 1),
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SAMPLE4( 1, 1),
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},
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.origin = SAMPLE4(0, 0)
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},
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[MALI_SAMPLE_PATTERN_ROTATED_4X_GRID] = {
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.positions = {
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SAMPLE8(-1, -3),
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SAMPLE8( 3, -1),
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SAMPLE8(-3, 1),
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SAMPLE8( 1, 3),
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},
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.origin = SAMPLE8(0, 0)
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},
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[MALI_SAMPLE_PATTERN_D3D_8X_GRID] = {
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.positions = {
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SAMPLE16( 1, -3),
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SAMPLE16(-1, 3),
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SAMPLE16( 5, 1),
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SAMPLE16(-3, -5),
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SAMPLE16(-5, 5),
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SAMPLE16(-7, -1),
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SAMPLE16( 3, 7),
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SAMPLE16( 7, -7),
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},
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.origin = SAMPLE16(0, 0)
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},
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[MALI_SAMPLE_PATTERN_D3D_16X_GRID] = {
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.positions = {
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SAMPLE16( 1, 1),
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SAMPLE16(-1, -3),
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SAMPLE16(-3, 2),
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SAMPLE16( 4, -1),
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SAMPLE16(-5, -2),
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SAMPLE16( 2, 5),
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SAMPLE16( 5, 3),
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SAMPLE16( 3, -5),
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SAMPLE16(-2, 6),
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SAMPLE16( 0, -7),
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SAMPLE16(-4, -6),
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SAMPLE16(-6, 4),
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SAMPLE16(-8, 0),
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SAMPLE16( 7, -4),
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SAMPLE16( 6, 7),
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SAMPLE16(-7, -8),
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},
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.origin = SAMPLE16(0, 0)
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},
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[MALI_SAMPLE_PATTERN_ROTATED_2X_GRID] = {
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.positions = {
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SAMPLE4( 1, 1),
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SAMPLE4(-1, -1),
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},
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.origin = SAMPLE4(0, 0)
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}
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};
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/* clang-format on */
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unsigned
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pan_sample_positions_buffer_size(void)
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{
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return sizeof(sample_position_lut);
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}
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unsigned
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pan_sample_positions_offset(enum mali_sample_pattern pattern)
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{
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assert(pattern < ARRAY_SIZE(sample_position_lut));
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unsigned offset = (pattern * sizeof(sample_position_lut[0]));
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return offset;
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}
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void
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pan_upload_sample_positions(void *buffer)
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{
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memcpy(buffer, sample_position_lut, sizeof(sample_position_lut));
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}
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