main.rs - mozsearch

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// Copyright 2016 GFX developers

//

// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or

// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or

// http://opensource.org/licenses/MIT>, at your option. This file may not be

// copied, modified, or distributed except according to those terms.

use metal::*;

use objc::rc::autoreleasepool;

const PROGRAM: &'static str = r"

    #include <metal_stdlib>

    using namespace metal;

    typedef struct {

        float2 position;

        float3 color;

    } vertex_t;

    struct ColorInOut {

        float4 position [[position]];

        float4 color;

};

    vertex ColorInOut vs(device vertex_t* vertex_array [[ buffer(0) ]],

                                      unsigned int vid [[ vertex_id ]])

        ColorInOut out;

        out.position = float4(float2(vertex_array[vid].position), 0.0, 1.0);

        out.color = float4(float3(vertex_array[vid].color), 1.0);

        return out;

    fragment float4 ps(ColorInOut in [[stage_in]])

        return in.color;

};

";

fn main() {

    autoreleasepool(|| {

        let device = Device::system_default().expect("no device found");

        let options = CompileOptions::new();

        let library = device.new_library_with_source(PROGRAM, &options).unwrap();

        let (vs, ps) = (

            library.get_function("vs", None).unwrap(),

            library.get_function("ps", None).unwrap(),

);

        let vertex_desc = VertexDescriptor::new();

        let desc = RenderPipelineDescriptor::new();

        desc.set_vertex_function(Some(&vs));

        desc.set_fragment_function(Some(&ps));

        desc.set_vertex_descriptor(Some(vertex_desc));

        println!("{:?}", desc);

        let reflect_options = MTLPipelineOption::ArgumentInfo | MTLPipelineOption::BufferTypeInfo;

        let (_, reflection) = device

            .new_render_pipeline_state_with_reflection(&desc, reflect_options)

            .unwrap();

        println!("Vertex arguments: ");

        let vertex_arguments = reflection.vertex_arguments();

        for index in 0..vertex_arguments.count() {

            let argument = vertex_arguments.object_at(index).unwrap();

            println!("{:?}", argument);

});