port from perforce

hgplus/ShaderMinifier/tests/real/extatique/blitsquare.fs

@@ -0,0 +1,18 @@
+uniform sampler2D tex;
+uniform vec2 size;
+uniform float border;
+
+
+void main()
+{	
+	vec2 p = gl_TexCoord[0].xy;	
+	
+	vec2 realP = p * size;
+	
+	float alphaX = smoothstep(0.0, border, realP.x) - smoothstep(size.x - border, size.x, realP.x);
+	float alphaY = smoothstep(0.0, border, realP.y) - smoothstep(size.y - border, size.y, realP.y);
+	
+	float alpha = alphaX * alphaY;
+	
+	gl_FragColor =  vec4(gl_Color.rgb, alpha) * texture2D(tex, p);
+}