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depth buffer implementation

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a dinosaur
2024-08-07 16:36:23 +10:00
parent 3b33842260
commit fbff9b77fd
4 changed files with 125 additions and 33 deletions
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40
Sources/Voxelotl/Matrix4x4.swift
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@ -43,18 +43,36 @@ public extension simd_float4x4 {
.init(0, 0, 0, 1))
}
static func perspective(verticalFov: T, aspect: T, near: T, far: T) -> Self {
let h = 1 / tan(verticalFov * T(0.5))
let w = h / aspect
let invClipRange = 1 / (far - near)
let z = -(far + near) * invClipRange
let z2 = -(2 * far * near) * invClipRange
static func orthographic(left: T, right: T, bottom: T, top: T, near: T, far: T) -> Self {
let
invWidth = 1 / (right - left),
invHeight = 1 / (top - bottom),
invDepth = 1 / (far - near)
let
tx = -(right + left) * invWidth,
ty = -(top + bottom) * invHeight,
tz = -near * invDepth
let x = 2 * invWidth, y = 2 * invHeight, z = invDepth
return .init(
.init(w, 0, 0, 0),
.init(0, h, 0, 0),
.init(0, 0, z, -1),
.init(0, 0, z2, 0))
.init( x, 0, 0, 0),
.init( 0, y, 0, 0),
.init( 0, 0, z, 0),
.init(tx, ty, tz, 1))
}
static func perspective(verticalFov fovY: T, aspect: T, near: T, far: T) -> Self {
let tanHalfFovY = tan(fovY * T(0.5))
let invClipRange = 1 / (near - far)
let y = 1 / tanHalfFovY
let x = y / aspect
let z = far * invClipRange
let w = near * z // (far * near) * invClipRange
return .init(
.init(x, 0, 0, 0),
.init(0, y, 0, 0),
.init(0, 0, z, -1),
.init(0, 0, w, 0))
}
}