Spinning cube

Cube.png

frag.glsl

#version 300 es
precision mediump float;

out vec4 f;
in vec4 col;

void main() {
	f = col;
}

vert.glsl

#version 300 es
precision highp float;
layout(location = 0) in vec4 in_position;
layout(location = 1) in vec4 in_colour;
out vec4 col;
uniform float theta;

void main() {
	vec3 coord = in_position.xyz;
	vec3 world = coord;

	world = vec3(
		world.x * cos(theta) - world.z * sin(theta),
		world.y,
		world.x * sin(theta) + world.z * cos(theta));

	float theta_2 = theta * 0.5f;
	world = vec3(
		world.x,
		world.y * cos(theta_2) - world.z * sin(theta_2),
		world.y * sin(theta_2) + world.z * cos(theta_2));

	/* Translate */
	world.z += 5.0;

	gl_Position = vec4(world.xyz, world.z);

	vec3 normal = normalize(coord);
	vec3 light = normalize(vec3(1.0, 3.0, 1.0));
	
	col = in_colour * dot(world, light);
}