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// Copyright 2026 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <array>
#include <chrono>
#include <cstring>
#include <random>
#include <span>
#include <string_view>
#include <fmt/format.h>
#include <gtest/gtest.h>
#include "Common/Align.h"
#include "Common/CommonTypes.h"
#include "VideoCommon/TextureDecoder.h"
#include "VideoCommon/TextureDecoder_Util.h"
static constexpr auto texture_sizes = {8, 16, 32, 64, 128, 256};
static constexpr u32 max_texture_size = *(texture_sizes.end() - 1);
static std::array<u8, 2 * sizeof(u32) * max_texture_size * max_texture_size> s_input_memory;
static std::array<u8, sizeof(u32) * max_texture_size * max_texture_size> s_output_memory;
class TextureDecoderTest : public testing::Test
{
protected:
static void SetUpTestSuite()
{
static constexpr DXTBlock cmpr_test_0 = DXTBlock{0xAA20, 0x20AA, {0x1B, 0xE4, 0x4B, 0xB1}};
static constexpr DXTBlock cmpr_test_1 = DXTBlock{0xBB30, 0x30BB, {0x1B, 0xE4, 0x4B, 0xB1}};
auto it = s_input_memory.data();
// Write 32-bit values with all bytes same
for (u32 i = 0; i < 0x100; ++i)
{
*it++ = i;
*it++ = i;
*it++ = i;
*it++ = i;
}
// Check that CMPR decoding is selecting the correct interpolation mode
std::memcpy(it, reinterpret_cast<const u8*>(&cmpr_test_0), sizeof(DXTBlock));
it += sizeof(DXTBlock);
std::memcpy(it, reinterpret_cast<const u8*>(&cmpr_test_1), sizeof(DXTBlock));
it += sizeof(DXTBlock);
// Write 32-bit values with one non-zero byte
for (u32 i = 1; i < 0x100; ++i)
{
*it++ = i;
*it++ = 0;
*it++ = 0;
*it++ = 0;
}
for (u32 i = 1; i < 0x100; ++i)
{
*it++ = 0;
*it++ = i;
*it++ = 0;
*it++ = 0;
}
for (u32 i = 1; i < 0x100; ++i)
{
*it++ = 0;
*it++ = 0;
*it++ = i;
*it++ = 0;
}
for (u32 i = 1; i < 0x100; ++i)
{
*it++ = 0;
*it++ = 0;
*it++ = 0;
*it++ = i;
}
// Write all 16-bit values
for (u32 i = 0; i < 0x10000; i++)
{
*it++ = i >> 8;
*it++ = i & 0xFF;
}
// Write random bytes
std::default_random_engine engine(0);
// uniform_int_distribution is guaranteed to work with short, but not with char
std::uniform_int_distribution<u16> dist;
while (it != s_input_memory.data() + s_input_memory.size())
*it++ = static_cast<u8>(dist(engine));
}
void SetUp() override { s_output_memory.fill(0); }
static std::chrono::nanoseconds TestTexture(u32 width, u32 height, TextureFormat texformat,
TLUTFormat tlutfmt)
{
// For the TLUT, we use some bytes from input_memory that don't overlap with the texture itself.
// Exactly which bytes we use isn't so important.
const u8* tlut = s_input_memory.data() +
Common::AlignUp(width, 8) * Common::AlignUp(height, 8) * sizeof(u32);
const std::span<const u8> tlut_span(tlut, s_input_memory.data() + s_input_memory.size());
u8* output = s_output_memory.data();
const auto start_time = std::chrono::steady_clock::now();
TexDecoder_Decode(output, s_input_memory.data(), width, height, texformat, tlut, tlutfmt);
const auto end_time = std::chrono::steady_clock::now();
for (u32 y = 0; y < height; ++y)
{
for (u32 x = 0; x < width; ++x)
{
u32 expected;
TexDecoder_DecodeTexel(reinterpret_cast<u8*>(&expected), std::span(s_input_memory), x, y,
width - 1, texformat, tlut_span, tlutfmt);
u32 actual;
std::memcpy(&actual, output + (y * width + x) * sizeof(u32), sizeof(u32));
EXPECT_EQ(expected, actual) << "x=" << x << ", y=" << y;
}
}
return end_time - start_time;
}
static void TestTextures(TextureFormat texformat, TLUTFormat tlutfmt, std::string_view name)
{
std::chrono::nanoseconds cumulative_time{0};
u32 iterations = 0;
for (u32 width : texture_sizes)
{
for (u32 height : texture_sizes)
{
cumulative_time += TestTexture(width, height, texformat, tlutfmt);
++iterations;
}
}
fmt::println("{} took {} ns on average ({} iterations)", name,
cumulative_time.count() / iterations, iterations);
}
};
TEST_F(TextureDecoderTest, I4)
{
TestTextures(TextureFormat::I4, TLUTFormat::IA8, "I4");
}
TEST_F(TextureDecoderTest, I8)
{
TestTextures(TextureFormat::I8, TLUTFormat::IA8, "I8");
}
TEST_F(TextureDecoderTest, IA4)
{
TestTextures(TextureFormat::IA4, TLUTFormat::IA8, "IA4");
}
TEST_F(TextureDecoderTest, IA8)
{
TestTextures(TextureFormat::IA8, TLUTFormat::IA8, "IA8");
}
TEST_F(TextureDecoderTest, RGB565)
{
TestTextures(TextureFormat::RGB565, TLUTFormat::IA8, "RGB565");
}
TEST_F(TextureDecoderTest, RGB5A3)
{
TestTextures(TextureFormat::RGB5A3, TLUTFormat::IA8, "RGB5A3");
}
TEST_F(TextureDecoderTest, RGBA8)
{
TestTextures(TextureFormat::RGBA8, TLUTFormat::IA8, "RGBA8");
}
TEST_F(TextureDecoderTest, C4_IA8)
{
TestTextures(TextureFormat::C4, TLUTFormat::IA8, "C4 (IA8)");
}
TEST_F(TextureDecoderTest, C4_RGB565)
{
TestTextures(TextureFormat::C4, TLUTFormat::RGB565, "C4 (RGB565)");
}
TEST_F(TextureDecoderTest, C4_RGB5A3)
{
TestTextures(TextureFormat::C4, TLUTFormat::RGB5A3, "C4 (RGB5A3)");
}
TEST_F(TextureDecoderTest, C8_IA8)
{
TestTextures(TextureFormat::C8, TLUTFormat::IA8, "C8 (IA8)");
}
TEST_F(TextureDecoderTest, C8_RGB565)
{
TestTextures(TextureFormat::C8, TLUTFormat::RGB565, "C8 (RGB565)");
}
TEST_F(TextureDecoderTest, C8_RGB5A3)
{
TestTextures(TextureFormat::C8, TLUTFormat::RGB5A3, "C8 (RGB5A3)");
}
TEST_F(TextureDecoderTest, C14X2_IA8)
{
TestTextures(TextureFormat::C14X2, TLUTFormat::IA8, "C14X2 (IA8)");
}
TEST_F(TextureDecoderTest, C14X2_RGB565)
{
TestTextures(TextureFormat::C14X2, TLUTFormat::RGB565, "C14X2 (RGB565)");
}
TEST_F(TextureDecoderTest, C14X2_RGB5A3)
{
TestTextures(TextureFormat::C14X2, TLUTFormat::RGB5A3, "C14X2 (RGB5A3)");
}
TEST_F(TextureDecoderTest, CMPR)
{
TestTextures(TextureFormat::CMPR, TLUTFormat::IA8, "CMPR");
}
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