mirror of
https://github.com/InstanceBrick/nightcap.git
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vii
88d10d53f2
Compressed bytes are copied to heap scratch, decoded heap to heap across up to 8 threads in block-row bands, and streamed into the staging buffer. Decoding straight from uncached Vulkan memory caused 200-460 ms hitches. The FPS trace now reports the longest frame gap per window.
272 lines
11 KiB
C++
272 lines
11 KiB
C++
#include "mocktail/graphics/etc2_decoder.h"
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#include <gtest/gtest.h>
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#include <array>
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#include <cstdint>
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#include <iterator>
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#include <random>
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#include <vector>
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namespace mocktail::graphics {
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namespace {
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using Block8 = std::array<std::uint8_t, 8>;
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struct Rgba {
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int r;
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int g;
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int b;
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int a;
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};
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std::vector<std::uint8_t> Decode(EtcFormat format,
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const std::vector<std::uint8_t>& source,
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std::uint32_t width, std::uint32_t height) {
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std::vector<std::uint8_t> output(
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static_cast<std::size_t>(width) * height * EtcDecodedTexelBytes(format),
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0xAB);
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EXPECT_TRUE(DecodeEtcImage(format, source.data(), source.size(), width,
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height, output.data(), output.size()));
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return output;
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}
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std::vector<std::uint8_t> Bytes(const Block8& block) {
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return {block.begin(), block.end()};
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}
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void ExpectRgba(const std::vector<std::uint8_t>& texels, std::uint32_t width,
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std::uint32_t x, std::uint32_t y, Rgba expected) {
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const std::size_t offset = (static_cast<std::size_t>(y) * width + x) * 4;
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ASSERT_LT(offset + 3, texels.size());
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EXPECT_EQ(texels[offset], expected.r) << "x=" << x << " y=" << y;
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EXPECT_EQ(texels[offset + 1], expected.g) << "x=" << x << " y=" << y;
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EXPECT_EQ(texels[offset + 2], expected.b) << "x=" << x << " y=" << y;
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EXPECT_EQ(texels[offset + 3], expected.a) << "x=" << x << " y=" << y;
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}
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std::uint16_t Unsigned16(const std::vector<std::uint8_t>& texels,
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std::size_t index) {
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return static_cast<std::uint16_t>(texels[index * 2] |
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(texels[index * 2 + 1] << 8));
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}
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std::int16_t Signed16(const std::vector<std::uint8_t>& texels,
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std::size_t index) {
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return static_cast<std::int16_t>(Unsigned16(texels, index));
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}
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TEST(Etc2DecoderTest, ReportsBlockAndTexelSizes) {
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EXPECT_EQ(EtcBlockBytes(EtcFormat::kEtc2Rgb8), 8U);
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EXPECT_EQ(EtcBlockBytes(EtcFormat::kEtc2Rgb8A1), 8U);
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EXPECT_EQ(EtcBlockBytes(EtcFormat::kEtc2Rgba8), 16U);
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EXPECT_EQ(EtcBlockBytes(EtcFormat::kEacR11), 8U);
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EXPECT_EQ(EtcBlockBytes(EtcFormat::kEacR11Signed), 8U);
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EXPECT_EQ(EtcBlockBytes(EtcFormat::kEacRg11), 16U);
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EXPECT_EQ(EtcBlockBytes(EtcFormat::kEacRg11Signed), 16U);
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EXPECT_EQ(EtcDecodedTexelBytes(EtcFormat::kEtc2Rgb8), 4U);
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EXPECT_EQ(EtcDecodedTexelBytes(EtcFormat::kEtc2Rgb8A1), 4U);
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EXPECT_EQ(EtcDecodedTexelBytes(EtcFormat::kEtc2Rgba8), 4U);
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EXPECT_EQ(EtcDecodedTexelBytes(EtcFormat::kEacR11), 2U);
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EXPECT_EQ(EtcDecodedTexelBytes(EtcFormat::kEacRg11Signed), 4U);
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}
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TEST(Etc2DecoderTest, DecodesIndividualMode) {
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// Base colours 8 (left sub-block) and 0 (right), codeword 0 (2/8).
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// Pixel (0,0) index 1 (+8), pixels in column 1 index 2 (-2).
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const Block8 block = {0x80, 0x80, 0x80, 0x00, 0x00, 0xF0, 0x00, 0x01};
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const auto texels = Decode(EtcFormat::kEtc2Rgb8, Bytes(block), 4, 4);
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ExpectRgba(texels, 4, 0, 0, {144, 144, 144, 255});
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ExpectRgba(texels, 4, 0, 1, {138, 138, 138, 255});
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ExpectRgba(texels, 4, 1, 0, {134, 134, 134, 255});
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ExpectRgba(texels, 4, 2, 0, {2, 2, 2, 255});
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}
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TEST(Etc2DecoderTest, DecodesDifferentialMode) {
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// R/G/B = 16 with delta +1: base colours 132 and 140, modifier +2.
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const Block8 block = {0x81, 0x81, 0x81, 0x02, 0x00, 0x00, 0x00, 0x00};
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const auto texels = Decode(EtcFormat::kEtc2Rgb8, Bytes(block), 4, 4);
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ExpectRgba(texels, 4, 0, 0, {134, 134, 134, 255});
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ExpectRgba(texels, 4, 2, 3, {142, 142, 142, 255});
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}
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TEST(Etc2DecoderTest, DecodesTMode) {
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// Red overflows: colour 1 (0,255,0), colour 2 (0,255,136), distance 11.
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const Block8 block = {0x04, 0xF0, 0x0F, 0x86, 0x00, 0x12, 0x00, 0x03};
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const auto texels = Decode(EtcFormat::kEtc2Rgb8, Bytes(block), 4, 4);
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ExpectRgba(texels, 4, 0, 0, {11, 255, 147, 255});
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ExpectRgba(texels, 4, 0, 1, {0, 244, 125, 255});
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ExpectRgba(texels, 4, 1, 0, {0, 255, 136, 255});
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ExpectRgba(texels, 4, 1, 1, {0, 255, 0, 255});
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}
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TEST(Etc2DecoderTest, DecodesHMode) {
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// Green overflows: colour 1 (0,0,0), colour 2 (255,17,255), distance 3.
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const Block8 block = {0x00, 0x04, 0x78, 0xFA, 0x80, 0x01, 0x80, 0x00};
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const auto texels = Decode(EtcFormat::kEtc2Rgb8, Bytes(block), 4, 4);
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ExpectRgba(texels, 4, 0, 0, {255, 20, 255, 255});
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ExpectRgba(texels, 4, 3, 3, {252, 14, 252, 255});
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ExpectRgba(texels, 4, 1, 0, {3, 3, 3, 255});
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}
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TEST(Etc2DecoderTest, DecodesPlanarMode) {
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// Blue overflows: O=(130,64,0), H=(0,255,0), V=(255,0,255).
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const Block8 block = {0x40, 0x40, 0x04, 0x02, 0xFE, 0x07, 0xE0, 0x3F};
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const auto texels = Decode(EtcFormat::kEtc2Rgb8, Bytes(block), 4, 4);
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ExpectRgba(texels, 4, 0, 0, {130, 64, 0, 255});
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ExpectRgba(texels, 4, 3, 0, {33, 207, 0, 255});
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ExpectRgba(texels, 4, 0, 3, {224, 16, 191, 255});
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ExpectRgba(texels, 4, 3, 3, {126, 159, 191, 255});
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}
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TEST(Etc2DecoderTest, DecodesPunchthroughAlpha) {
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// Opaque bit clear: index 2 is transparent black, index 0 has no modifier.
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const Block8 block = {0x81, 0x81, 0x81, 0x00, 0x00, 0x01, 0x00, 0x02};
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const auto texels = Decode(EtcFormat::kEtc2Rgb8A1, Bytes(block), 4, 4);
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ExpectRgba(texels, 4, 0, 0, {0, 0, 0, 0});
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ExpectRgba(texels, 4, 0, 1, {140, 140, 140, 255});
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ExpectRgba(texels, 4, 1, 0, {132, 132, 132, 255});
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ExpectRgba(texels, 4, 2, 0, {140, 140, 140, 255});
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}
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TEST(Etc2DecoderTest, DecodesRgba8WithAlphaBlockFirst) {
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// Alpha: base 100, multiplier 2, table 0; pixel (0,0) index 7 (+14).
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const std::vector<std::uint8_t> block = {
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100, 0x20, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x88, 0x88, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00,
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};
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const auto texels = Decode(EtcFormat::kEtc2Rgba8, block, 4, 4);
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ExpectRgba(texels, 4, 0, 0, {138, 138, 138, 128});
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ExpectRgba(texels, 4, 1, 0, {138, 138, 138, 94});
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}
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TEST(Etc2DecoderTest, DecodesUnsignedR11) {
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const Block8 block = {128, 0x10, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00};
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const auto texels = Decode(EtcFormat::kEacR11, Bytes(block), 4, 4);
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EXPECT_EQ(Unsigned16(texels, 0), 36497);
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EXPECT_EQ(Unsigned16(texels, 1), 32143);
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const Block8 zero_multiplier = {0, 0x00, 0, 0, 0, 0, 0, 0};
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const auto flat = Decode(EtcFormat::kEacR11, Bytes(zero_multiplier), 1, 1);
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EXPECT_EQ(Unsigned16(flat, 0), 32);
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}
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TEST(Etc2DecoderTest, DecodesSignedR11) {
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const Block8 block = {0x80, 0x10, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00};
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const auto texels = Decode(EtcFormat::kEacR11Signed, Bytes(block), 4, 4);
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EXPECT_EQ(Signed16(texels, 0), -28956);
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EXPECT_EQ(Signed16(texels, 1), -32767);
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}
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TEST(Etc2DecoderTest, DecodesRg11AsTwoChannels) {
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const std::vector<std::uint8_t> block = {
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128, 0x10, 0xE0, 0, 0, 0, 0, 0,
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0, 0x00, 0x00, 0, 0, 0, 0, 0,
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};
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const auto texels = Decode(EtcFormat::kEacRg11, block, 1, 1);
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EXPECT_EQ(Unsigned16(texels, 0), 36497);
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EXPECT_EQ(Unsigned16(texels, 1), 32);
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}
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TEST(Etc2DecoderTest, DecodesPartialAndMultipleBlocks) {
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const Block8 t_mode = {0x04, 0xF0, 0x0F, 0x86, 0x00, 0x12, 0x00, 0x03};
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const Block8 differential = {0x81, 0x81, 0x81, 0x02, 0, 0, 0, 0};
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std::vector<std::uint8_t> source = Bytes(t_mode);
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source.insert(source.end(), differential.begin(), differential.end());
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const auto texels = Decode(EtcFormat::kEtc2Rgb8, source, 5, 1);
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ExpectRgba(texels, 5, 0, 0, {11, 255, 147, 255});
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ExpectRgba(texels, 5, 1, 0, {0, 255, 136, 255});
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ExpectRgba(texels, 5, 4, 0, {134, 134, 134, 255});
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}
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std::vector<std::uint8_t> RandomBlocks(EtcFormat format, std::uint32_t width,
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std::uint32_t height,
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std::uint32_t seed) {
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std::mt19937 rng(seed);
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std::vector<std::uint8_t> source(((width + 3) / 4) * ((height + 3) / 4) *
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EtcBlockBytes(format));
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for (std::uint8_t& byte : source) {
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byte = static_cast<std::uint8_t>(rng());
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}
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return source;
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}
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TEST(Etc2DecoderTest, DecodesBlockRowBandsLikeWholeImage) {
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const std::uint32_t width = 13;
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const std::uint32_t height = 10;
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const auto source = RandomBlocks(EtcFormat::kEtc2Rgba8, width, height, 1);
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const auto whole = Decode(EtcFormat::kEtc2Rgba8, source, width, height);
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std::vector<std::uint8_t> banded(whole.size(), 0xAB);
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ASSERT_TRUE(DecodeEtcImageBlockRows(EtcFormat::kEtc2Rgba8, source.data(),
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source.size(), width, height, 1, 2,
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banded.data(), banded.size()));
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ASSERT_TRUE(DecodeEtcImageBlockRows(EtcFormat::kEtc2Rgba8, source.data(),
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source.size(), width, height, 0, 1,
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banded.data(), banded.size()));
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EXPECT_EQ(banded, whole);
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EXPECT_FALSE(DecodeEtcImageBlockRows(EtcFormat::kEtc2Rgba8, source.data(),
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source.size(), width, height, 2, 2,
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banded.data(), banded.size()));
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}
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TEST(Etc2DecoderTest, DecodesJobsOnWorkersLikeSerialDecode) {
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struct Case {
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EtcFormat format;
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std::uint32_t width;
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std::uint32_t height;
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};
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const Case cases[] = {{EtcFormat::kEtc2Rgb8, 1030, 770},
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{EtcFormat::kEtc2Rgba8, 517, 1024},
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{EtcFormat::kEacRg11, 300, 301},
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{EtcFormat::kEtc2Rgb8A1, 3, 5}};
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std::vector<std::vector<std::uint8_t>> sources;
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std::vector<std::vector<std::uint8_t>> expected;
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std::vector<std::vector<std::uint8_t>> outputs;
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std::vector<EtcDecodeJob> jobs;
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for (std::size_t index = 0; index < std::size(cases); ++index) {
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const Case& c = cases[index];
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sources.push_back(RandomBlocks(c.format, c.width, c.height,
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static_cast<std::uint32_t>(index + 2)));
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expected.push_back(Decode(c.format, sources.back(), c.width, c.height));
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outputs.emplace_back(expected.back().size(), 0xAB);
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}
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for (std::size_t index = 0; index < std::size(cases); ++index) {
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const Case& c = cases[index];
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jobs.push_back({c.format, sources[index].data(), sources[index].size(),
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c.width, c.height, outputs[index].data(),
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outputs[index].size()});
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}
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std::vector<std::uint8_t> short_output(4 * 4 * 4 - 1, 0xAB);
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jobs.push_back({EtcFormat::kEtc2Rgb8, sources[0].data(), sources[0].size(),
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4, 4, short_output.data(), short_output.size()});
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DecodeEtcJobs(jobs.data(), jobs.size(), 4);
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for (std::size_t index = 0; index < std::size(cases); ++index) {
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EXPECT_TRUE(jobs[index].ok) << index;
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EXPECT_EQ(outputs[index], expected[index]) << index;
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}
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EXPECT_FALSE(jobs.back().ok);
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EXPECT_EQ(short_output, std::vector<std::uint8_t>(4 * 4 * 4 - 1, 0xAB));
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}
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TEST(Etc2DecoderTest, RejectsShortBuffers) {
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const std::vector<std::uint8_t> source(8, 0);
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std::vector<std::uint8_t> output(4 * 4 * 4, 0);
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EXPECT_FALSE(DecodeEtcImage(EtcFormat::kEtc2Rgb8, source.data(), 7, 4, 4,
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output.data(), output.size()));
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EXPECT_FALSE(DecodeEtcImage(EtcFormat::kEtc2Rgb8, source.data(),
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source.size(), 4, 4, output.data(),
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output.size() - 1));
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EXPECT_FALSE(DecodeEtcImage(EtcFormat::kEtc2Rgb8, source.data(),
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source.size(), 5, 4, output.data(),
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output.size()));
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EXPECT_FALSE(DecodeEtcImage(EtcFormat::kEtc2Rgb8, nullptr, 0, 0, 0,
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output.data(), output.size()));
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}
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} // namespace
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} // namespace mocktail::graphics
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