/**
* Basic tenebrae vertex program.
* This compiles under the arbvp and vp20 vertex program profiles.
* compile with "-profile vp20 -posinv"
*/
struct appdata {
    float4 position : POSITION;
    float4 texcoord : TEXCOORD0;	//texture coords of color/bump map
	float4 normal	: NORMAL;		//tangent space basis vectors
	float4 tangent	: TEXCOORD1;
	float4 binormal	: TEXCOORD2;
};

struct v2f {
    float4 HPOS : POSITION;
    float4 TEX0 : TEXCOORD0;		//color map texture coordinates
	float4 TEX1 : TEXCOORD1;		//tangent space light vector unnormalized
	float4 TEX2 : TEXCOORD2;		//bump map texture coordinates
	float4 TEX3 : TEXCOORD3;		//world space vertex position (for attenuation)
};

v2f main(appdata I,uniform float4x4 objviewproj : _GL_MVP, uniform float4x4 texture_matrix : c0)
{
    v2f O;
    // transform vertices into projection space using the pre-multiplied matrix
    O.HPOS = mul(objviewproj, I.position);

	//copy stuff to output
    O.TEX0 = I.texcoord;
	O.TEX2 = I.texcoord;

	//transform into tangent space
	O.TEX1.x = dot(I.position,I.tangent);
	O.TEX1.y = dot(I.position,I.binormal);
	O.TEX1.z = dot(I.position,I.normal);

	//transform with texture matrix
	O.TEX3 = mul(texture_matrix, I.position);

    return O;
} // main