将浮点或颜色从Swift传递到金属碎片着色器

struct Uniforms {
    var floatParameter: Float
    var colorParameter: simd_float4
}

let uniforms = Uniforms(floatParameter: 0.5, colorParameter: simd_float4(1.0, 0.0, 0.0, 1.0))

fragment float4 fragmentShader(VertexOut vertex [[stage_in]],
                               constant Uniforms& uniforms [[buffer(0)]]) {
    // 使用uniforms中的浮点参数和颜色参数进行着色操作
    // ...
    return float4(1.0, 1.0, 1.0, 1.0);
}

struct Vertex {
    var position: simd_float3
    var color: simd_float4
}

let vertices = [Vertex(position: simd_float3(0.0, 0.0, 0.0), color: simd_float4(1.0, 0.0, 0.0, 1.0)),
                Vertex(position: simd_float3(1.0, 0.0, 0.0), color: simd_float4(0.0, 1.0, 0.0, 1.0)),
                Vertex(position: simd_float3(0.0, 1.0, 0.0), color: simd_float4(0.0, 0.0, 1.0, 1.0))]

fragment float4 fragmentShader(VertexOut vertex [[stage_in]],
                               constant Vertex* vertices [[buffer(0)]],
                               uint vertexId [[vertex_id]]) {
    // 使用vertices中的浮点参数和颜色参数进行着色操作
    // ...
    return float4(1.0, 1.0, 1.0, 1.0);
}