varying vec3 vpos, vdir, normal;
#ifdef USE_SHADOWMAP
varying vec4 shadow_tc;
#endif
#ifdef USE_CUBEMAP
varying vec3 wdir;
uniform mat4 envmap_matrix;
#endif

void main()
{
	gl_Position = ftransform();

	vpos = (gl_ModelViewMatrix * gl_Vertex).xyz;
	normal = gl_NormalMatrix * gl_Normal;
	vdir = -vpos;
#ifdef USE_CUBEMAP
	wdir = (envmap_matrix * vec4(vdir, 1.0)).xyz;	// bring back to world space
#endif
#ifdef USE_TEXMAP
	gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
#endif

#ifdef USE_SHADOWMAP
	mat4 offmat = mat4(0.5, 0.0, 0.0, 0.0,
			0.0, 0.5, 0.0, 0.0,
			0.0, 0.0, 0.5, 0.0,
			0.5, 0.5, 0.5, 1.0);
	mat4 tex_matrix = offmat * gl_TextureMatrix[1];

	shadow_tc = tex_matrix * vec4(vpos, 1.0);
#endif
}