// GL Shading Language version 1.0 Vertex Shader
//  Orion Sky Lawlor, olawlor@acm.org, 2006/08/31 (Public Domain)

// C++/vertex shader interface
uniform float spin_x, spin_y;

// Vertex/fragment shader interface:
varying vec4 color; // Material diffuse color

// Input: gl_Vertex.  Output: gl_Position.
void main(void) 
{
	// Vertex positions come from the C program:
	vec4 v = gl_Vertex;
	
	gl_Position = vec4( 
	/* output X_w */ +1.4*v.x -0.5, 
	/* output Y_w */ +0.3*v.y, 
	/* output Z_w */ 0, 
	/* output w */ 1.0 );
	// gl_Position is where onscreen the vertex will be drawn.
	
	// We'll set color the same as input position
	color=gl_Vertex;
}