80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
////////////////////////////////////////////////////////////
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//~ Gpu math constants
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#define Pi ((f32)3.14159265358979323846)
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#define Tau ((f32)6.28318530717958647693)
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#define GoldenRatio ((f32)1.61803398874989484820)
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////////////////////////////////////////////////////////////
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//~ Gpu math types
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typedef float2 Vec2;
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typedef float3 Vec3;
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typedef float4 Vec4;
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typedef int2 Vec2I32;
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typedef int3 Vec3I32;
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typedef int4 Vec4I32;
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typedef uint2 Vec2U32;
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typedef uint3 Vec3U32;
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typedef uint4 Vec4U32;
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typedef float2x3 Xform;
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typedef float4 Rect;
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typedef float4 ClipRect;
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typedef float4 Aabb;
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typedef float4 Quad;
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typedef float4x4 Mat4x4;
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////////////////////////////////////////////////////////////
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//~ Integer -> float
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Vec4 Vec4NormFromU32(u32 v)
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{
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Vec4 result;
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result.r = ((v >> 0) & 0xFF) / 255.0;
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result.g = ((v >> 8) & 0xFF) / 255.0;
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result.b = ((v >> 16) & 0xFF) / 255.0;
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result.a = ((v >> 24) & 0xFF) / 255.0;
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return result;
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}
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////////////////////////////////////////////////////////////
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//~ Srgb -> linear
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/* Linear color from normalized sRGB */
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Vec4 LinearFromSrgbVec4(Vec4 srgb)
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{
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return Vec4(pow(abs(srgb.rgb), 2.2), srgb.a);
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}
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/* Linear color from R8G8B8A8 sRGB */
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Vec4 LinearFromSrgbU32(u32 srgb32)
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{
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return LinearFromSrgbVec4(Vec4NormFromU32(srgb32));
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}
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////////////////////////////////////////////////////////////
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//~ Vertex ID helpers
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Vec2 RectUvFromVertexId(u32 id)
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{
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static const Vec2 uvs[4] = {
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Vec2(0, 0),
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Vec2(1, 0),
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Vec2(1, 1),
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Vec2(0, 1)
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};
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return uvs[id];
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}
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////////////////////////////////////////////////////////////
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//~ Ndc helpers
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Vec2 NdcFromViewport(Vec2 viewport_size, Vec2 viewport_coords)
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{
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Vec2 result;
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result = viewport_coords / viewport_size;
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result *= Vec2(2, -2);
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result += Vec2(-1, 1);
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return result;
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}
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