Framebuffer working; Trimap renders to FB; Refinem. use Trimap to Screen

opengl-test-two/refinement.fragmentshader

@@ -0,0 +1,46 @@
+#version 330 core
+
+// Interpolated values from the vertex shaders
+in vec2 UV;
+
+// Ouput data
+out vec3 color;
+
+// Values that stay constant for the whole mesh.
+uniform sampler2D trimap;
+uniform sampler2D foreground;
+
+
+int IS_BACKGROUND = 0;
+int IS_UNDEFINED = 1;
+int IS_FOREGROUND = 2;
+int UNSET = -1;
+
+vec3 getTriColor(vec2 uvCoord) {
+    return texture(trimap, uvCoord).rgb;
+}
+
+vec3 getForeColor(vec2 uvCoord) {
+    return texture(foreground, uvCoord).rgb;
+}
+
+int getState(vec3 c) {
+    if (all(lessThanEqual(c, vec3(0.2f)))) {
+        return IS_BACKGROUND;
+    } else if (all(greaterThanEqual(c, vec3(0.8f)))) {
+        return IS_FOREGROUND;
+    } else {
+        return IS_UNDEFINED;
+    }
+}
+
+
+void main(){
+    color = getTriColor(UV);
+    int status = getState(color);
+
+
+    if (status==IS_FOREGROUND) {
+        color = getForeColor(UV).rgb;
+    }
+}