usePostEffect(name: string, uniform?: Uniform | ()=>Uniform): void
Apply a post process effect from a shader name.since
loadShader("invert", null, ` vec4 frag(vec2 pos, vec2 uv, vec4 color, sampler2D tex) { vec4 c = def_frag(); return vec4(1.0 - c.r, 1.0 - c.g, 1.0 - c.b, c.a); } `) usePostEffect("invert")
