naga 0.3.0

Shader translation infrastructure
Documentation 
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use super::ast::Program;
use super::error::ErrorKind;
use super::lex::Lexer;
use super::parser;
use crate::ShaderStage;

fn parse_program(source: &str, stage: ShaderStage) -> Result<Program, ErrorKind> {
    let mut program = Program::new(stage, "");
    let lex = Lexer::new(source);
    let mut parser = parser::Parser::new(&mut program);

    for token in lex {
        parser.parse(token)?;
    }
    parser.end_of_input()?;
    Ok(program)
}

#[test]
fn version() {
    // invalid versions
    assert_eq!(
        format!(
            "{:?}",
            parse_program("#version 99000", ShaderStage::Vertex)
                .err()
                .unwrap()
        ),
        "InvalidVersion(TokenMetadata { line: 0, chars: 9..14 }, 99000)"
    );

    assert_eq!(
        format!(
            "{:?}",
            parse_program("#version 449", ShaderStage::Vertex)
                .err()
                .unwrap()
        ),
        "InvalidVersion(TokenMetadata { line: 0, chars: 9..12 }, 449)"
    );

    assert_eq!(
        format!(
            "{:?}",
            parse_program("#version 450 smart", ShaderStage::Vertex)
                .err()
                .unwrap()
        ),
        "InvalidProfile(TokenMetadata { line: 0, chars: 13..18 }, \"smart\")"
    );

    assert_eq!(
        format!(
            "{:?}",
            parse_program("#version 450\nvoid f(){} #version 450", ShaderStage::Vertex)
                .err()
                .unwrap()
        ),
        "InvalidToken(Unknown((TokenMetadata { line: 1, chars: 11..12 }, \"#\")))"
    );

    // valid versions
    let program = parse_program("  #  version 450\nvoid main() {}", ShaderStage::Vertex).unwrap();
    assert_eq!(
        format!("{:?}", (program.version, program.profile)),
        "(450, Core)"
    );

    let program = parse_program("#version 450\nvoid main() {}", ShaderStage::Vertex).unwrap();
    assert_eq!(
        format!("{:?}", (program.version, program.profile)),
        "(450, Core)"
    );

    let program = parse_program("#version 450 core\nvoid main() {}", ShaderStage::Vertex).unwrap();
    assert_eq!(
        format!("{:?}", (program.version, program.profile)),
        "(450, Core)"
    );
}

#[test]
fn control_flow() {
    let _program = parse_program(
        r#"
        #  version 450
        void main() {
            if (true) {
                return 1;
            } else {
                return 2;
            }
        }
        "#,
        ShaderStage::Vertex,
    )
    .unwrap();

    let _program = parse_program(
        r#"
        #  version 450
        void main() {
            if (true) {
                return 1;
            }
        }
        "#,
        ShaderStage::Vertex,
    )
    .unwrap();

    let _program = parse_program(
        r#"
        #  version 450
        void main() {
            int x;
            int y = 3;
            switch (5) {
                case 2:
                    x = 2;
                case 5:
                    x = 5;
                    y = 2;
                    break;
                default:
                    x = 0;
            }
        }
        "#,
        ShaderStage::Vertex,
    )
    .unwrap();
    let _program = parse_program(
        r#"
        #  version 450
        void main() {
            int x = 0;
            while(x < 5) {
                x = x + 1;
            }
            do {
                x = x - 1;
            } while(x >= 4)
        }
        "#,
        ShaderStage::Vertex,
    )
    .unwrap();

    let _program = parse_program(
        r#"
        #  version 450
        void main() {
            int x = 0;
            for(int i = 0; i < 10;) {
                x = x + 2;
            }
            return x;
        }
        "#,
        ShaderStage::Vertex,
    )
    .unwrap();
}

#[test]
fn textures() {
    let _program = parse_program(
        r#"
        #version 450
        layout(location = 0) in vec2 v_uv;
        layout(location = 0) out vec4 o_color;
        layout(set = 1, binding = 1) uniform texture2D tex;
        layout(set = 1, binding = 2) uniform sampler tex_sampler;
        void main() {
            o_color = texture(sampler2D(tex, tex_sampler), v_uv);
        }
        "#,
        ShaderStage::Fragment,
    )
    .unwrap();
}