74 lines
1.7 KiB
C++
74 lines
1.7 KiB
C++
#include "Std140Buffer.h"
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#include <cstring>
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#include <iostream>
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#include <vector>
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namespace
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{
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int gFailures = 0;
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void Expect(bool condition, const char* message)
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{
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if (condition)
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return;
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std::cerr << "FAIL: " << message << "\n";
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++gFailures;
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}
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float ReadFloat(const std::vector<unsigned char>& buffer, std::size_t offset)
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{
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float value = 0.0f;
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std::memcpy(&value, buffer.data() + offset, sizeof(float));
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return value;
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}
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int ReadInt(const std::vector<unsigned char>& buffer, std::size_t offset)
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{
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int value = 0;
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std::memcpy(&value, buffer.data() + offset, sizeof(int));
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return value;
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}
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void TestScalarPacking()
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{
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std::vector<unsigned char> buffer;
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AppendStd140Float(buffer, 1.25f);
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AppendStd140Int(buffer, 7);
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Expect(buffer.size() == 8, "scalar values pack tightly on 4-byte alignment");
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Expect(ReadFloat(buffer, 0) == 1.25f, "float value is written at offset 0");
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Expect(ReadInt(buffer, 4) == 7, "int value is written at offset 4");
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}
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void TestVectorAlignment()
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{
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std::vector<unsigned char> buffer;
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AppendStd140Float(buffer, 1.0f);
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AppendStd140Vec2(buffer, 2.0f, 3.0f);
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AppendStd140Vec4(buffer, 4.0f, 5.0f, 6.0f, 7.0f);
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Expect(buffer.size() == 32, "vec2 aligns to 8 bytes and vec4 aligns to 16 bytes");
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Expect(ReadFloat(buffer, 8) == 2.0f, "vec2 x value is aligned");
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Expect(ReadFloat(buffer, 12) == 3.0f, "vec2 y value follows x");
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Expect(ReadFloat(buffer, 16) == 4.0f, "vec4 x value is aligned");
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Expect(ReadFloat(buffer, 28) == 7.0f, "vec4 w value is written");
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}
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}
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int main()
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{
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TestScalarPacking();
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TestVectorAlignment();
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if (gFailures != 0)
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{
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std::cerr << gFailures << " Std140Buffer test failure(s).\n";
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return 1;
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}
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std::cout << "Std140Buffer tests passed.\n";
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return 0;
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}
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