#version 430

layout (binding = 0) uniform sampler2D sprite;

layout (location = 0) in vec4 color;
layout (location = 1) in vec2 uv;

layout (location = 0) out vec4 texel;

layout (binding = 0) readonly buffer Camera {
	mat4 projection_matrix;
};

layout (binding = 1) readonly buffer Material {
	float effect_magnitude;
};

void main() {
	const vec2 red_channel_uv = uv + vec2(effect_magnitude, 0.0);
	const vec2 blue_channel_uv = uv + vec2(-effect_magnitude, 0.0);
	const vec4 original_texel = texture(sprite, uv);

	texel = vec4(texture(sprite, red_channel_uv).r, original_texel.g, texture(sprite, blue_channel_uv).b, original_texel.a) * color;

	if (texel.a == 0) {
		discard;
	}
}