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// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <array>
#include <unordered_map>
#include "common/assert.h"
#include "common/common_types.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/shader/registry.h"
#include "video_core/shader/transform_feedback.h"
namespace VideoCommon::Shader {
namespace {
using Maxwell = Tegra::Engines::Maxwell3D::Regs;
// TODO(Rodrigo): Change this to constexpr std::unordered_set in C++20
/// Attribute offsets that describe a vector
constexpr std::array VECTORS = {
28, // gl_Position
32, // Generic 0
36, // Generic 1
40, // Generic 2
44, // Generic 3
48, // Generic 4
52, // Generic 5
56, // Generic 6
60, // Generic 7
64, // Generic 8
68, // Generic 9
72, // Generic 10
76, // Generic 11
80, // Generic 12
84, // Generic 13
88, // Generic 14
92, // Generic 15
96, // Generic 16
100, // Generic 17
104, // Generic 18
108, // Generic 19
112, // Generic 20
116, // Generic 21
120, // Generic 22
124, // Generic 23
128, // Generic 24
132, // Generic 25
136, // Generic 26
140, // Generic 27
144, // Generic 28
148, // Generic 29
152, // Generic 30
156, // Generic 31
160, // gl_FrontColor
164, // gl_FrontSecondaryColor
160, // gl_BackColor
164, // gl_BackSecondaryColor
192, // gl_TexCoord[0]
196, // gl_TexCoord[1]
200, // gl_TexCoord[2]
204, // gl_TexCoord[3]
208, // gl_TexCoord[4]
212, // gl_TexCoord[5]
216, // gl_TexCoord[6]
220, // gl_TexCoord[7]
};
} // namespace
std::unordered_map<u8, VaryingTFB> BuildTransformFeedback(const GraphicsInfo& info) {
std::unordered_map<u8, VaryingTFB> tfb;
for (std::size_t buffer = 0; buffer < Maxwell::NumTransformFeedbackBuffers; ++buffer) {
const auto& locations = info.tfb_varying_locs[buffer];
const auto& layout = info.tfb_layouts[buffer];
const std::size_t varying_count = layout.varying_count;
std::size_t highest = 0;
for (std::size_t offset = 0; offset < varying_count; ++offset) {
const std::size_t base_offset = offset;
const u8 location = locations[offset];
VaryingTFB varying;
varying.buffer = layout.stream;
varying.stride = layout.stride;
varying.offset = offset * sizeof(u32);
varying.components = 1;
if (std::find(VECTORS.begin(), VECTORS.end(), location / 4 * 4) != VECTORS.end()) {
UNIMPLEMENTED_IF_MSG(location % 4 != 0, "Unaligned TFB");
const u8 base_index = location / 4;
while (offset + 1 < varying_count && base_index == locations[offset + 1] / 4) {
++offset;
++varying.components;
}
}
[[maybe_unused]] const bool inserted = tfb.emplace(location, varying).second;
UNIMPLEMENTED_IF_MSG(!inserted, "Varying already stored");
highest = std::max(highest, (base_offset + varying.components) * sizeof(u32));
}
UNIMPLEMENTED_IF(highest != layout.stride);
}
return tfb;
}
} // namespace VideoCommon::Shader
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