initial commit

shaders/selection_frame.glsl

@@ -0,0 +1,24 @@
+// vert //
+
+void main(void) {
+	qgl_FragTexture = qgl_Texture;
+	gl_Position = qgl_ftransform();
+}
+
+
+// frag //
+
+uniform vec2 dt, size;
+uniform float thickness;
+
+void main(void) {
+	vec2 frame_size = size / dt;
+	vec2 pix_pos = qgl_FragTexture * frame_size;
+	vec2 frame = vec2(1) + step(pix_pos, vec2(thickness)) - step(pix_pos, frame_size - vec2(thickness));
+	vec2 line = frame * step(0.5, fract(pix_pos.yx / thickness / 4.));
+	float fc = max(frame.x, frame.y);
+	float fl = max(line.x , line.y );
+	fl = mix(1, fl, fc);
+	qgl_FragColor = vec4(vec3(fl), fc * 0.8 + 0.2);
+	//qgl_FragColor = vec4(vec3(fl,0),1);
+}