trapezoid-core 0.3.0

A PSX emulator, backed by vulkano for rendering
Documentation 
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#[derive(Copy, Clone, Debug, Default)]
#[repr(C)]
pub struct DrawingVertex {
    position: [f32; 2],
    color: [f32; 3],
    tex_coord: [i32; 2],
}

impl DrawingVertex {
    #[allow(dead_code)]
    #[inline]
    pub fn color(&self) -> [f32; 3] {
        self.color
    }

    #[inline]
    pub fn position(&self) -> [f32; 2] {
        self.position
    }

    #[inline]
    pub fn set_position(&mut self, position: [f32; 2]) {
        self.position = position;
    }

    #[inline]
    pub fn tex_coord(&self) -> [i32; 2] {
        self.tex_coord
    }

    #[inline]
    pub fn set_tex_coord(&mut self, tex_coord: [i32; 2]) {
        self.tex_coord = tex_coord;
    }

    #[inline]
    pub fn new_with_color(color: u32) -> Self {
        let mut s = Self::default();
        s.color_from_u32(color);
        s
    }

    #[inline]
    pub fn position_from_u32(&mut self, position: u32) {
        self.position = vertex_position_from_u32(position);
    }

    #[inline]
    pub fn color_from_u32(&mut self, color: u32) {
        let r = (color & 0xFF) as u8;
        let g = ((color >> 8) & 0xFF) as u8;
        let b = ((color >> 16) & 0xFF) as u8;

        self.color = [r as f32 / 255.0, g as f32 / 255.0, b as f32 / 255.0];
    }

    #[inline]
    pub fn tex_coord_from_u32(&mut self, tex_coord: u32) {
        self.tex_coord = [(tex_coord & 0xFF) as i32, ((tex_coord >> 8) & 0xFF) as i32];
    }
}

#[derive(Copy, Clone, Debug, Default)]
pub struct DrawingTextureParams {
    pub clut_base: [u32; 2],
    pub tex_page_base: [u32; 2],
    pub semi_transparency_mode: u8,
    pub tex_page_color_mode: u8,
    pub texture_disable: bool,
}

impl DrawingTextureParams {
    /// Process tex page params, from the lower 16 bits, this is only used
    /// for when drawing rectangle, as the tex_page is take fron the gpu_stat
    /// and not from a parameter
    #[inline]
    pub fn tex_page_from_gpustat(&mut self, param: u32) {
        let x = param & 0xF;
        let y = (param >> 4) & 1;

        self.tex_page_base = [x * 64, y * 256];
        self.semi_transparency_mode = ((param >> 5) & 3) as u8;
        self.tex_page_color_mode = ((param >> 7) & 3) as u8;
        self.texture_disable = (param >> 11) & 1 == 1;
    }

    /// Process tex page params, from the higher 16 bits, which is found
    /// in tex page parameter in drawing stuff
    #[inline]
    pub fn tex_page_from_u32(&mut self, param: u32) {
        let param = param >> 16;
        self.tex_page_from_gpustat(param);
    }

    #[inline]
    pub fn clut_from_u32(&mut self, param: u32) {
        let param = param >> 16;
        let x = param & 0x3F;
        let y = (param >> 6) & 0x1FF;
        self.clut_base = [x * 16, y];
    }
}

#[inline]
pub fn vertex_position_from_u32(position: u32) -> [f32; 2] {
    let x = position & 0x7ff;
    let sign_extend = 0xfffff800 * ((x >> 10) & 1);
    let x = (x | sign_extend) as i32;
    let y = (position >> 16) & 0x7ff;
    let sign_extend = 0xfffff800 * ((y >> 10) & 1);
    let y = (y | sign_extend) as i32;
    [x as f32, y as f32]
}