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//
// Header containing types and enum constants shared between Metal shaders and C/ObjC source
//
// Buffer index values shared between shader and C code to ensure Metal shader buffer inputs match
// Metal API buffer set calls
enum BufferIndices : Int {
case kBufferIndexMeshPositions = 0
case kBufferIndexMeshGenerics = 1
case kBufferIndexInstanceUniforms = 2
case kBufferIndexSharedUniforms = 3
}
// Attribute index values shared between shader and C code to ensure Metal shader vertex
// attribute indices match the Metal API vertex descriptor attribute indices
enum VertexAttributes : Int {
case kVertexAttributePosition = 0
case kVertexAttributeTexcoord = 1
case kVertexAttributeNormal = 2
}
// Texture index values shared between shader and C code to ensure Metal shader texture indices
// match indices of Metal API texture set calls
enum TextureIndices : Int {
case kTextureIndexColor = 0
case kTextureIndexY = 1
case kTextureIndexCbCr = 2
}
// Structure shared between shader and C code to ensure the layout of shared uniform data accessed in
// Metal shaders matches the layout of uniform data set in C code
struct SharedUniforms {
// Camera Uniforms
var projectionMatrix: matrix_float4x4
var viewMatrix: matrix_float4x4
// Lighting Properties
var ambientLightColor: vector_float3
var directionalLightDirection: vector_float3
var directionalLightColor: vector_float3
var materialShininess: Float
}
// Structure shared between shader and C code to ensure the layout of instance uniform data accessed in
// Metal shaders matches the layout of uniform data set in C code
struct InstanceUniforms {
var modelMatrix: matrix_float4x4
}