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naga 0.3.0

Shader translation infrastructure
Documentation 
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use super::parse_str;

#[test]
fn parse_comment() {
    parse_str(
        "//
        ////
        ///////////////////////////////////////////////////////// asda
        //////////////////// dad ////////// /
        /////////////////////////////////////////////////////////////////////////////////////////////////////
        //
    ",
    )
    .unwrap();
}

#[test]
fn parse_types() {
    parse_str("const a : i32 = 2;").unwrap();
    assert!(parse_str("const a : x32 = 2;").is_err());
    parse_str("var t: texture_2d<f32>;").unwrap();
    parse_str("var t: texture_cube_array<i32>;").unwrap();
    parse_str("var t: texture_multisampled_2d<u32>;").unwrap();
    parse_str("var t: [[access(write)]] texture_storage_1d<rgba8uint>;").unwrap();
    parse_str("var t: [[access(read)]] texture_storage_3d<r32float>;").unwrap();
}

#[test]
fn parse_type_cast() {
    parse_str(
        "
        const a : i32 = 2;
        fn main() {
            var x: f32 = f32(a);
            x = f32(i32(a + 1) / 2);
        }
    ",
    )
    .unwrap();
    parse_str(
        "
        fn main() {
            const x: vec2<f32> = vec2<f32>(1.0, 2.0);
            const y: vec2<u32> = vec2<u32>(x);
        }
    ",
    )
    .unwrap();
}

#[test]
fn parse_struct() {
    parse_str(
        "
        [[block]] struct Foo { x: i32; };
        struct Bar { [[span(16)]] x: vec2<i32>; };
        struct Empty {};
        var s: [[access(read_write)]] Foo;
    ",
    )
    .unwrap();
}

#[test]
fn parse_standard_fun() {
    parse_str(
        "
        fn main() {
            var x: i32 = min(max(1, 2), 3);
        }
    ",
    )
    .unwrap();
}

#[test]
fn parse_statement() {
    parse_str(
        "
        fn main() {
            ;
            {}
            {;}
        }
    ",
    )
    .unwrap();
}

#[test]
fn parse_if() {
    parse_str(
        "
        fn main() {
            if (true) {
                discard;
            } else {}
            if (0 != 1) {}
        }
    ",
    )
    .unwrap();
}

#[test]
fn parse_loop() {
    parse_str(
        "
        fn main() {
            var i: i32 = 0;
            loop {
                if (i == 1) { break; }
                continuing { i = 1; }
            }
            loop {
                if (i == 0) { continue; }
                break;
            }
        }
    ",
    )
    .unwrap();
}

#[test]
fn parse_switch() {
    parse_str(
        "
        fn main() {
            var pos: f32;
            switch (3) {
                case 0, 1: { pos = 0.0; }
                case 2: { pos = 1.0; fallthrough; }
                case 3: {}
                default: { pos = 3.0; }
            }
        }
    ",
    )
    .unwrap();
}

#[test]
fn parse_texture_load() {
    parse_str(
        "
        var t: texture_3d<u32>;
        fn foo() {
            const r: vec4<u32> = textureLoad(t, vec3<u32>(0.0, 1.0, 2.0), 1);
        }
    ",
    )
    .unwrap();
    parse_str(
        "
        var t: texture_multisampled_2d_array<i32>;
        fn foo() {
        const r: vec4<i32> = textureLoad(t, vec2<i32>(10, 20), 2, 3);
        }
    ",
    )
    .unwrap();
    parse_str(
        "
        var t: [[access(read)]] texture_storage_1d_array<r32float>;
        fn foo() {
            const r: vec4<f32> = textureLoad(t, 10, 2);
        }
    ",
    )
    .unwrap();
}

#[test]
fn parse_postfix() {
    parse_str("fn foo() { const x: f32 = vec4<f32>(1.0, 2.0, 3.0, 4.0).xyz.rgbr.aaaa.wz.g; }")
        .unwrap();
    parse_str("fn foo() { const x: f32 = fract(vec2<f32>(0.5, 1.0)).x; }").unwrap();
}