wimrend 0.1.0

Wgpu Immediate Mode RENDerer
Documentation 
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// Line renderer shader

// colour must be prefixed to work on metal
// https://github.com/gfx-rs/naga/issues/1490
struct VertexInput {
	@location(0) v_colour: vec4<f32>,
    @location(1) position: vec3<f32>,
	@location(2) normal: vec3<f32>,
	@location(3) uv: vec2<f32>,
};

struct InstanceInput {
	@location(4) proj1: vec4<f32>,
	@location(5) proj2: vec4<f32>,
	@location(6) proj3: vec4<f32>,
	@location(7) proj4: vec4<f32>,
	@location(8) i_colour: vec4<f32>,
};

struct CameraUniform {
	proj: mat4x4<f32>,
	res: vec2<f32>,
};

@group(0) @binding(0)
var<uniform> uniform_buf: CameraUniform;

struct VertexOutput {
    @builtin(position) clip_position: vec4<f32>,
	@location(0) colour: vec4<f32>,
	@location(1) tex_coords: vec2<f32>,
};

@vertex
fn vs_main(
    @builtin(vertex_index) in_vertex_index: u32,
    model: VertexInput,
	instance: InstanceInput,
) -> VertexOutput {
    var out: VertexOutput;
    out.clip_position = vec4<f32>(model.position.x, model.position.y, 0.0, 1.0);

	var start = uniform_buf.proj * instance.proj1;
	var end = uniform_buf.proj * instance.proj2;
	var dir = normalize(end - start);
	var cross_dir = vec2<f32>(-dir.y, dir.x);
	var res = vec2<f32>(1.0) / uniform_buf.res;
	var thickness = instance.proj3.xx * res;
	var pos_base = start + (end - start) * model.position.y;
	out.clip_position = pos_base + vec4<f32>(cross_dir * thickness, 0.0, 0.0) * ((model.position.x - 0.5) * pos_base.w);

	out.colour = model.v_colour * instance.i_colour;
	out.tex_coords = model.uv;
    return out;
}

@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
	return in.colour;
}