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Get face normals updated

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This commit is contained in:
Eryn Wells 2018-11-19 21:52:53 -07:00
parent 764b772fd9
commit 43e42f5374
3 changed files with 16 additions and 7 deletions
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14
Terrain2/Terrain.swift
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@ -87,6 +87,7 @@ class Terrain: NSObject {
let segments: uint2
let vertexDescriptor: MTLVertexDescriptor
let mesh: MTKMesh
let faceNormalsBuffer: MTLBuffer
var generator: TerrainGenerator
@ -117,6 +118,14 @@ class Terrain: NSObject {
return nil
}
// A normal is a float 3. Two triangles per segment, x * t segments.
let faceNormalsLength = MemoryLayout<float3>.stride * 2 * Int(segments.x * segments.y)
guard let faceNormalsBuf = device.makeBuffer(length: faceNormalsLength, options: .storageModePrivate) else {
print("Couldn't create buffer for face normals")
return nil
}
faceNormalsBuffer = faceNormalsBuf
super.init()
}
@ -164,9 +173,8 @@ class Terrain: NSObject {
computeEncoder.setBuffer(indexBuffer.buffer, offset: indexBuffer.offset, index: GeneratorBufferIndex.meshPositions.rawValue)
let vertexBuffer = mesh.vertexBuffers[BufferIndex.meshPositions.rawValue]
computeEncoder.setBuffer(vertexBuffer.buffer, offset: vertexBuffer.offset, index: GeneratorBufferIndex.indexes.rawValue)
// let normalBuffer = mesh.vertexBuffers[BufferIndex.faceNormals.rawValue]
// computeEncoder.setBuffer(normalBuffer.buffer, offset: normalBuffer.offset, index: BufferIndex.faceNormals.rawValue)
computeEncoder.dispatchThreads(MTLSize(width: mesh.vertexCount, height: 1, depth: 1), threadsPerThreadgroup: MTLSize(width: 64, height: 1, depth: 1))
computeEncoder.setBuffer(faceNormalsBuffer, offset: 0, index: GeneratorBufferIndex.faceNormals.rawValue)
computeEncoder.dispatchThreads(MTLSize(width: 2 * Int(segments.x * segments.y), height: 1, depth: 1), threadsPerThreadgroup: MTLSize(width: 64, height: 1, depth: 1))
computeEncoder.popDebugGroup()
computeEncoder.endEncoding()
}