vert

// VERTEX SHADER

attribute vec2 a_position;

uniform vec2 u_resolution;
uniform vec3 u_palette[256];
varying vec3 v_color;

void main() {
	
	// convert the pixel positions to -1->+1 (clipspace)
	vec2 clipSpace = ((a_position / u_resolution) * 2.0) - 1.0;
	
	int index = int(a_position.x);
	
	v_color = u_palette[index];
	gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);
}