GL_TEXTURE_2D_ref.frag

// fragment shader
#version 150

// this is how we receive the texture
uniform sampler2D tex0;
in vec2 varyingtexcoord;
out vec4 outputColor;

void main()
{
	vec4 color = texture(tex0, varyingtexcoord);
	outputColor = color;
}

GL_TEXTURE_2D_ref.vert

#version 150

uniform mat4 modelViewProjectionMatrix;
out vec2 varyingtexcoord;
in vec4 position;

void main(){
	varyingtexcoord = position.xy/720.0;//screen width
	gl_Position = modelViewProjectionMatrix * position;
}