162 lines
5.8 KiB
C
162 lines
5.8 KiB
C
/*
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* Copyright (C) 2019 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "pan_device.h"
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#include "pan_bo.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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(((x) + 8) * (256 / 16)), \
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(((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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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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};
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mali_ptr
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panfrost_sample_positions(const struct panfrost_device *dev,
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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 dev->sample_positions->ptr.gpu + offset;
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}
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void
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panfrost_upload_sample_positions(struct panfrost_device *dev)
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{
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STATIC_ASSERT(sizeof(sample_position_lut) < 4096);
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dev->sample_positions = panfrost_bo_create(dev, 4096, 0, "Sample positions");
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memcpy(dev->sample_positions->ptr.cpu, sample_position_lut,
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sizeof(sample_position_lut));
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}
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/* CPU side LUT query, to implement glGetMultisamplefv */
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void
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panfrost_query_sample_position(
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enum mali_sample_pattern pattern,
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unsigned sample_idx,
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float *out)
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{
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struct mali_sample_position pos =
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sample_position_lut[pattern].positions[sample_idx];
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out[0] = DECODE_FIXED_16(pos.x);
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out[1] = DECODE_FIXED_16(pos.y);
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}
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