Support top-left origin for compute shaders.

[movit] / footer.comp

diff --git a/footer.comp b/footer.comp
index a28014d684b69af8985b9fe911b2db400c089a6c..c4d1305be8512bcb1c77e17b3e24ee2266dc5686 100644 (file)
--- a/footer.comp
+++ b/footer.comp
@@ -5,6 +5,10 @@
 #define SQUARE_ROOT_TRANSFORMATION 0
 #endif
 
+#ifndef FLIP_ORIGIN
+#define FLIP_ORIGIN 0
+#endif
+
 void main()
 {
        INPUT();
@@ -30,5 +34,10 @@ void cs_output(ivec2 coord, vec4 val)
        // Make sure we don't give negative values to sqrt.
        val.rgb = sqrt(max(val.rgb, 0.0));
 #endif
+
+#if FLIP_ORIGIN
+       coord.y = imageSize(outbuf).y - coord.y - 1;
+#endif
+
        imageStore(outbuf, coord, val);
 }