//jack/RYBN 2010
#version 130
#extension GL_EXT_gpu_shader4 : enable
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect Ttex1;
uniform sampler2DRect Ttex2;
uniform sampler2DRect tex0;
uniform float style;
uniform float mix_factor;
varying vec2 texcoord0;
ivec2 size1 = textureSize(Ttex1);
ivec2 size2 = textureSize(Ttex2);
ivec2 size0 = textureSize(tex0);

void main (void)
{
	float sizeF1X = float(size1.x)/float(size0.x);
	float sizeF1Y = float(size1.y)/float(size0.y);
	float sizeF2X = float(size2.x)/float(size0.x);
	float sizeF2Y = float(size2.y)/float(size0.y);
	vec4 color1 = texture2DRect(Ttex1, vec2(texcoord0.s*sizeF1X,texcoord0.t*sizeF1Y));
	vec4 color2 = texture2DRect(Ttex2, vec2(texcoord0.s*sizeF2X,texcoord0.t*sizeF2Y));
	if (style == 0.) {
		gl_FragColor = (color1 + color2);
	} else if (style == 1.) {
		gl_FragColor = (color1 - color2);
	} else if (style == 2.) {
		gl_FragColor = abs(color1 - color2);
	} else if (style == 3.) {
		gl_FragColor = (color1 * color2);
	} else if (style == 4.) {
		gl_FragColor = mix(color1,color2,mix_factor);
	}

}
