64 lines
2.2 KiB
Swift
Executable File
64 lines
2.2 KiB
Swift
Executable File
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import simd
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struct Vertex {
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var position: vector_float4
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var color: vector_float4
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init(pos: vector_float4, col: vector_float4) {
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position = pos
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color = col
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}
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}
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struct Uniforms {
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var modelViewProjectionMatrix: matrix_float4x4
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}
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func translationMatrix(position: float3) -> matrix_float4x4 {
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let X = vector_float4(1, 0, 0, 0)
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let Y = vector_float4(0, 1, 0, 0)
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let Z = vector_float4(0, 0, 1, 0)
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let W = vector_float4(position.x, position.y, position.z, 1)
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return matrix_float4x4(columns:(X, Y, Z, W))
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}
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func scalingMatrix(scale: Float) -> matrix_float4x4 {
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let X = vector_float4(scale, 0, 0, 0)
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let Y = vector_float4(0, scale, 0, 0)
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let Z = vector_float4(0, 0, scale, 0)
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let W = vector_float4(0, 0, 0, 1)
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return matrix_float4x4(columns:(X, Y, Z, W))
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}
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func rotationMatrix(angle: Float, _ axis: vector_float3) -> matrix_float4x4 {
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var X = vector_float4(0, 0, 0, 0)
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X.x = axis.x * axis.x + (1 - axis.x * axis.x) * cos(angle)
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X.y = axis.x * axis.y * (1 - cos(angle)) - axis.z * sin(angle)
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X.z = axis.x * axis.z * (1 - cos(angle)) + axis.y * sin(angle)
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X.w = 0.0
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var Y = vector_float4(0, 0, 0, 0)
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Y.x = axis.x * axis.y * (1 - cos(angle)) + axis.z * sin(angle)
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Y.y = axis.y * axis.y + (1 - axis.y * axis.y) * cos(angle)
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Y.z = axis.y * axis.z * (1 - cos(angle)) - axis.x * sin(angle)
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Y.w = 0.0
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var Z = vector_float4(0, 0, 0, 0)
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Z.x = axis.x * axis.z * (1 - cos(angle)) - axis.y * sin(angle)
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Z.y = axis.y * axis.z * (1 - cos(angle)) + axis.x * sin(angle)
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Z.z = axis.z * axis.z + (1 - axis.z * axis.z) * cos(angle)
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Z.w = 0.0
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let W = vector_float4(0, 0, 0, 1)
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return matrix_float4x4(columns:(X, Y, Z, W))
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}
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func projectionMatrix(near: Float, far: Float, aspect: Float, fovy: Float) -> matrix_float4x4 {
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let scaleY = 1 / tan(fovy * 0.5)
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let scaleX = scaleY / aspect
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let scaleZ = -(far + near) / (far - near)
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let scaleW = -2 * far * near / (far - near)
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let X = vector_float4(scaleX, 0, 0, 0)
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let Y = vector_float4(0, scaleY, 0, 0)
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let Z = vector_float4(0, 0, scaleZ, -1)
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let W = vector_float4(0, 0, scaleW, 0)
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return matrix_float4x4(columns:(X, Y, Z, W))
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}
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