/*
Bump/parallax mapping shader for single directional light source
The fastest shader for bump/bump mapping

*/

uniform vec3 CamPos;
uniform mat3 ModelRotateMatrix;
uniform vec3 ModelTranslateVector;

attribute vec3 Tangent;
attribute vec3 Binormal;

varying vec2 texCoord;
varying vec3 camVec;
varying vec3 lightVec;

//for fragment shader
varying vec4 vPos;
varying vec4 gPos;

void main()
{
	vec4 realVertexPos = vec4(ModelRotateMatrix * gl_Vertex.xyz + ModelTranslateVector, 1.0);
	gl_Position = gl_ModelViewProjectionMatrix * realVertexPos; 
	
	texCoord = gl_MultiTexCoord0.st;
	
	vec3 lVec = normalize(gl_LightSource[0].position.xyz);
	vec3 cVec = (CamPos - gl_Vertex.xyz);
	
	mat3 rot;
	rot[0] = Tangent;
	rot[1] = Binormal;
	rot[2] = gl_Normal.xyz;
	
	rot = ModelRotateMatrix * rot;

	lightVec = lVec * rot;
	camVec =  cVec * rot;
	
		//For shadows
	vPos = realVertexPos;
	gPos = gl_ProjectionMatrix * gl_Position;
	gl_TexCoord[0] = gl_MultiTexCoord0;
}