#version 450

#ifdef GL_ES
precision highp float;
#endif

// #ifdef _CPos
	// uniform mat4 invVP;
	// uniform vec3 eye;
// #endif

in vec2 pos;

out vec2 texCoord;
// #ifdef _CPos
	// out vec3 viewRay;
// #endif

void main() {
	// Scale vertex attribute to [0-1] range
	#ifdef _InvY
	const vec2 madd = vec2(0.5, -0.5);
	#else
	const vec2 madd = vec2(0.5, 0.5);
	#endif
	texCoord = pos.xy * madd + madd;

	gl_Position = vec4(pos.xy, 0.0, 1.0);

// #ifdef _CPos
	// NDC (at the back of cube)
	// vec4 v = vec4(pos.xy, 1.0, 1.0);	
	// v = vec4(invVP * v);
	// v.xyz /= v.w;
	// viewRay = v.xyz - eye;
// #endif
}