uniform mat4 projectionMatrix;
uniform mat4 modelViewMatrix;
uniform mat3 normalMatrix;

out vec4 posInView;
#ifdef NORMAL_MAP
out vec3 varTangent;
out vec3 varBinormal;
#endif

#ifdef WIREFRAME
out vec3 varColor;
#else
out vec3 varNormal;

out vec2 varTexCoord;
#endif

layout(location = 0)in vec3 inPosition;
layout(location = 2)in vec2 inTexCoord;
layout(location = 1)in vec3 inNormal;
#ifdef NORMAL_MAP
layout(location = 3)in vec3 inTangent;
layout(location = 4)in vec3 inBinormal;
#endif

#ifdef INSTANCED
layout(location = 5)in vec3 inInstanceOffset;
#endif

void main(void) {
    // computing normals
#ifdef NORMAL_MAP
    varTangent = normalize(normalMatrix*inTangent);
    varBinormal = normalize(normalMatrix*inBinormal);
#endif

#ifdef WIREFRAME
    varColor = inNormal;
#else
    varNormal = normalize(normalMatrix*inNormal);
    
    //computing UVs
    varTexCoord = inTexCoord.xy;
#endif

    // computing positions
#ifdef INSTANCED
    vec4 pos = vec4(inPosition + inInstanceOffset, 1.0);
#else
    vec4 pos = vec4(inPosition, 1.0);
#endif

    posInView = modelViewMatrix * pos;
    gl_Position = projectionMatrix * posInView;
}