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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#version 460 core
layout (local_size_x = 1024) in;
layout (std430, set = 0, binding = 0) readonly buffer InputBuffer {
uint input_indexes[];
};
layout (std430, set = 0, binding = 1) writeonly buffer OutputBuffer {
uint output_indexes[];
};
layout (push_constant) uniform PushConstants {
uint base_vertex;
int index_shift; // 0: uint8, 1: uint16, 2: uint32
int is_strip; // 0: quads 1: quadstrip
};
void main() {
int primitive = int(gl_GlobalInvocationID.x);
if (primitive * 6 >= output_indexes.length()) {
return;
}
int index_size = 8 << index_shift;
int flipped_shift = 2 - index_shift;
int mask = (1 << flipped_shift) - 1;
const int quads_swizzle[6] = int[](0, 1, 2, 0, 2, 3);
const int quad_strip_swizzle[6] = int[](0, 3, 1, 0, 2, 3);
for (uint vertex = 0; vertex < 6; ++vertex) {
int offset = (is_strip == 0 ? primitive * 4 + quads_swizzle[vertex] : primitive * 2 + quad_strip_swizzle[vertex]);
int int_offset = offset >> flipped_shift;
int bit_offset = (offset & mask) * index_size;
uint packed_input = input_indexes[int_offset];
uint index = bitfieldExtract(packed_input, bit_offset, index_size);
output_indexes[primitive * 6 + vertex] = index + base_vertex;
}
}
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