#version 120

#extension GL_ARB_texture_rectangle : enable

#extension GL_EXT_gpu_shader4 : enable

uniform sampler2DRect texture0;

uniform sampler2DRect texture1; //Second texture

void main(){

vec2 pos = gl_TexCoord[0].xy;

vec4 color0 = texture2DRect(texture0, pos);

vec4 color1 = texture2DRect(texture1, pos);

vec4 color;

/********************

note that default value of "a" is zero.

********************/

// color = color0;

color = (color0 + color1) / 2;

// color.ba = color0.ba;

//Output of the shader

gl_FragColor = color;

}