wgpu 0.4.0

#version 450

layout(location = 0) in vec2 a_Pos;
layout(location = 1) in vec4 a_Color;
layout(location = 0) out vec4 f_Color;

void main() {
    gl_Position = vec4(a_Pos, 0.0, 1.0);
    f_Color = a_Color;
}