// Vertex Shader
attribute vec3 inPosition;
attribute vec3 inNormal;

uniform vec4 m_Color;
uniform mat4 g_WorldViewProjectionMatrix;
uniform mat4 g_WorldViewMatrix;
uniform mat3 g_NormalMatrix;

varying vec4 vertColor;

void main() {
    gl_Position = g_WorldViewProjectionMatrix * vec4(inPosition, 1.0);
    //vec3 lightDir = vec3(g_WorldViewMatrix * vec4(gl_LightSource[0].position));
    vec3 lightDir = vec3(gl_LightSource[0].position);
    //vec3 lightDir = vec3(-1.0, -1.0, -1.0);
    vec3 normal = g_NormalMatrix * inNormal;
    float factor = dot(-1 * lightDir, normal);
    vertColor = m_Color * factor;
}


// Fragment Shader (just a passthrough)
varying vec4 vertColor;

void main() {
    gl_FragColor = vertColor;
}