#ifdef GL_ES
precision highp int;
precision highp float;
#endif

#define USE_OGRE_FROM_FUTURE
#include <OgreUnifiedShader.h>

OGRE_UNIFORMS(
uniform mat4 worldViewProj;
uniform vec4 ambient;
uniform vec4 objSpaceLight;
uniform vec4 lightColour;
)

MAIN_PARAMETERS
IN(vec4 vertex, POSITION)
IN(vec3 normal, NORMAL)
OUT(vec4 oColour, TEXCOORD0)
MAIN_DECLARATION
{
  gl_Position = mul(worldViewProj, vertex);
  
	// get vertex light direction (support directional and point)
	vec3 light = normalize(objSpaceLight.xyz - (vertex.xyz * vec3_splat(objSpaceLight.w)));
  float diffuseFactor = abs(dot(normal, light));
	oColour = ambient + (vec4_splat(diffuseFactor) * lightColour);
}