3b1b-manim/manimlib/shaders/textured_surface_frag.glsl

#version 330

uniform sampler2D Texture;
uniform vec3 light_source_position;

in vec3 xyz_coords;
in vec3 v_normal;
in vec2 v_im_coords;
in float v_opacity;
in float v_gloss;
in float v_shadow;

out vec4 frag_color;

#INSERT add_light.glsl

void main() {
    vec4 im_color = texture(Texture, v_im_coords);
    frag_color = add_light(
        im_color,
        xyz_coords,
        normalize(v_normal),
        light_source_position,
        v_gloss,
        v_shadow
    );
    frag_color.a = v_opacity;
}