2021-32-bit-holiday-jam/src/glezz.rs

// Trivial wrappers around GLESv2 C functions that should be safe

use glam::{Mat4, Vec3, Vec4};

pub fn clear_color (r: f32, g: f32, b: f32, a: f32) {
	unsafe {
		gl::ClearColor (r, g, b, a);
	}
}

pub fn clear (flags: u32) {
	unsafe {
		gl::Clear (flags);
	}
}

pub fn disable (constant: u32) {
	unsafe {
		gl::Disable (constant);
	}
}

pub fn enable (constant: u32) {
	unsafe {
		gl::Enable (constant);
	}
}

pub fn front_face (constant: u32) {
	unsafe {
		gl::FrontFace (constant);
	}
}

pub fn blend_func (src: u32, dst: u32) {
	unsafe {
		gl::BlendFunc (src, dst);
	}
}

pub fn enable_vertex_attrib_array (id: Option <u32>) {
	if let Some (id) = id {
		// Are safety checks really needed here?
		unsafe {
			gl::EnableVertexAttribArray (id);
		}
	}
}

pub fn uniform_1i (uni: i32, x: i32) {
	unsafe {
		gl::Uniform1i (uni, x);
	}
}

pub fn uniform_1f (uni: i32, x: f32) {
	unsafe {
		gl::Uniform1f (uni, x);
	}
}

pub fn uniform_3fv (uni: i32, v: &Vec3) {
	unsafe {
		gl::Uniform3fv (uni, 1, v as *const Vec3 as *const f32);
	}
}

pub fn uniform_4fv (uni: i32, v: &Vec4) {
	unsafe {
		gl::Uniform4fv (uni, 1, v as *const Vec4 as *const f32);
	}
}

pub fn uniform_matrix_4fv (uni: i32, m: &Mat4) {
	const FALSE_U8: u8 = 0;
	
	unsafe {
		gl::UniformMatrix4fv (uni, 1, FALSE_U8, m as *const Mat4 as *const f32);
	}
}

// More abstract things below here