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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <algorithm>
#include <array>
#include <vector>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/polyfill_ranges.h"
#include "shader_recompiler/shader_info.h"
#include "video_core/transform_feedback.h"
namespace VideoCommon {
std::pair<std::array<Shader::TransformFeedbackVarying, 256>, u32> MakeTransformFeedbackVaryings(
const TransformFeedbackState& state) {
static constexpr std::array VECTORS{
28U, // gl_Position
32U, // Generic 0
36U, // Generic 1
40U, // Generic 2
44U, // Generic 3
48U, // Generic 4
52U, // Generic 5
56U, // Generic 6
60U, // Generic 7
64U, // Generic 8
68U, // Generic 9
72U, // Generic 10
76U, // Generic 11
80U, // Generic 12
84U, // Generic 13
88U, // Generic 14
92U, // Generic 15
96U, // Generic 16
100U, // Generic 17
104U, // Generic 18
108U, // Generic 19
112U, // Generic 20
116U, // Generic 21
120U, // Generic 22
124U, // Generic 23
128U, // Generic 24
132U, // Generic 25
136U, // Generic 26
140U, // Generic 27
144U, // Generic 28
148U, // Generic 29
152U, // Generic 30
156U, // Generic 31
160U, // gl_FrontColor
164U, // gl_FrontSecondaryColor
160U, // gl_BackColor
164U, // gl_BackSecondaryColor
192U, // gl_TexCoord[0]
196U, // gl_TexCoord[1]
200U, // gl_TexCoord[2]
204U, // gl_TexCoord[3]
208U, // gl_TexCoord[4]
212U, // gl_TexCoord[5]
216U, // gl_TexCoord[6]
220U, // gl_TexCoord[7]
};
std::array<Shader::TransformFeedbackVarying, 256> xfb{};
u32 count{0};
for (size_t buffer = 0; buffer < state.layouts.size(); ++buffer) {
const auto& locations = state.varyings[buffer];
const auto& layout = state.layouts[buffer];
const u32 varying_count = layout.varying_count;
u32 highest = 0;
for (u32 offset = 0; offset < varying_count; ++offset) {
const auto get_attribute = [&locations](u32 index) -> u32 {
switch (index % 4) {
case 0:
return locations[index / 4].attribute0.Value();
case 1:
return locations[index / 4].attribute1.Value();
case 2:
return locations[index / 4].attribute2.Value();
case 3:
return locations[index / 4].attribute3.Value();
}
UNREACHABLE();
return 0;
};
UNIMPLEMENTED_IF_MSG(layout.stream != 0, "Stream is not zero: {}", layout.stream);
Shader::TransformFeedbackVarying varying{
.buffer = static_cast<u32>(buffer),
.stride = layout.stride,
.offset = offset * 4,
.components = 1,
};
const u32 base_offset = offset;
const auto attribute{get_attribute(offset)};
if (std::ranges::find(VECTORS, Common::AlignDown(attribute, 4)) != VECTORS.end()) {
UNIMPLEMENTED_IF_MSG(attribute % 4 != 0, "Unaligned TFB {}", attribute);
const auto base_index = attribute / 4;
while (offset + 1 < varying_count && base_index == get_attribute(offset + 1) / 4) {
++offset;
++varying.components;
}
}
xfb[attribute] = varying;
count = std::max(count, attribute);
highest = std::max(highest, (base_offset + varying.components) * 4);
}
UNIMPLEMENTED_IF(highest != layout.stride);
}
return {xfb, count + 1};
}
} // namespace VideoCommon
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