#version 330

// Uniforms
uniform mat4 matrixProjection;
uniform mat4 matrixModelView;
uniform mat4 matrixView;

uniform vec3 materialAmbient;

layout (location = 0) in vec3 aVertex;
layout (location = 2) in vec3 aNormal;
layout (location = 3) in vec2 aTexCoord;

out vec4 color;
out vec4 position;
out vec3 normal;
out vec2 texCoord0;


// ambient light declaration
struct AMBIENT
{
	int on;
	vec3 color;
};
uniform AMBIENT lightAmbient;



// ambient light function
vec4 AmbientLight(AMBIENT light)
{
	return vec4(materialAmbient * light.color, 1);
}


void main(void)
{
	// calculate position
	position = matrixModelView * vec4(aVertex, 1.0);
	gl_Position = matrixProjection * position;

	// calculate normal
	normal = normalize(mat3(matrixModelView) * aNormal);

	// calculate texture coordinate
	texCoord0 = aTexCoord;


	color = vec4(0.0, 0.0, 0.0, 1.0);

	if (lightAmbient.on == 1) color += AmbientLight(lightAmbient);
}