1 files changed, 17 insertions, 0 deletions
diff --git a/smoothCamera.glsl b/smoothCamera.glsl
new file mode 100644
index 0000000..074c52c
--- /dev/null
+++ b/smoothCamera.glsl
@@ -0,0 +1,17 @@
+//[[
+//
+//  applies sub-pixel offset to the viewport texture for smooth camera movement
+//  while keeping pixel-perfect rendering. 
+//  - game is rendered with camera snapped to integer pixels (pixel-perfect)
+//  - this shader samples the texture with a UV offset = (smooth_pos - snapped_pos)
+//  - the offset creates the illusion of smooth camera movement
+//
+//  offset: (subPixelX, subPixelY) in UV space (0-1 range)
+//  texture must have 1px padding on each side to avoid black bars when sampling.
+//]]
+
+extern vec2 offset;
+
+vec4 effect(vec4 color, Image tex, vec2 texture_coords, vec2 screen_coords) {
+    return Texel(tex, texture_coords + offset);
+}