1 files changed, 71 insertions, 0 deletions
diff --git a/raveos-theme/gnome/theme-data/extensions/installed/blur-my-shell@aunetx/effects/derivative.glsl b/raveos-theme/gnome/theme-data/extensions/installed/blur-my-shell@aunetx/effects/derivative.glsl
new file mode 100644
index 0000000..64c1682
--- /dev/null
+++ b/raveos-theme/gnome/theme-data/extensions/installed/blur-my-shell@aunetx/effects/derivative.glsl
@@ -0,0 +1,71 @@
+uniform sampler2D tex;
+uniform int operation;
+uniform float width;
+uniform float height;
+
+#define CORRECTION 2.25
+#define SIZE_ADDITION 3
+
+vec4 get_texture_at_position(vec2 position) {
+    vec2 raw_position = position + vec2(CORRECTION, CORRECTION);
+    vec2 raw_uv = raw_position / vec2(width + SIZE_ADDITION, height + SIZE_ADDITION);
+
+    return texture2D(tex, raw_uv);
+}
+
+vec4 try_get_texture_at_position(vec2 position, inout int count) {
+    if (any(greaterThanEqual(position, vec2(width, height))) ||
+        any(lessThan(position, vec2(0, 0)))) {
+        return vec4(0);
+    } else {
+        count++;
+        return get_texture_at_position(position);
+    }
+}
+
+ivec2 get_corrected_position() {
+    vec2 raw_uv = cogl_tex_coord0_in.st;
+    vec2 raw_position = raw_uv * vec2(width + SIZE_ADDITION, height + SIZE_ADDITION);
+    return ivec2(raw_position - vec2(CORRECTION, CORRECTION));
+}
+
+void main() {
+    ivec2 corrected_position = get_corrected_position();
+
+    // 1-step derivative
+    if (operation == 0) {
+        vec4 color = vec4(0);
+        int c = 0;
+        color += try_get_texture_at_position(corrected_position + vec2(0, 1), c);
+        color -= try_get_texture_at_position(corrected_position + vec2(0, 0), c);
+        color += try_get_texture_at_position(corrected_position + vec2(1, 0), c);
+        color -= try_get_texture_at_position(corrected_position + vec2(0, 0), c);
+        if (c < 4) {
+            color = vec4(0);
+        }
+        cogl_color_out = vec4(color.xyz, 1);
+    } else
+    // 2-step derivative
+    if (operation == 1) {
+        vec4 color = vec4(0);
+        int c = 0;
+        color += try_get_texture_at_position(corrected_position + vec2(0, 1), c);
+        color -= try_get_texture_at_position(corrected_position + vec2(0, -1), c);
+        color += try_get_texture_at_position(corrected_position + vec2(1, 0), c);
+        color -= try_get_texture_at_position(corrected_position + vec2(-1, 0), c);
+        if (c < 4) {
+            color = vec4(0);
+        }
+        cogl_color_out = vec4(color.xyz / 2, 1);
+    } else
+    // laplacian
+    if (operation == 2) {
+        vec4 color = vec4(0);
+        color = -4 * get_texture_at_position(corrected_position);
+        color += get_texture_at_position(corrected_position + vec2(0, 1));
+        color += get_texture_at_position(corrected_position + vec2(0, -1));
+        color += get_texture_at_position(corrected_position + vec2(1, 0));
+        color += get_texture_at_position(corrected_position + vec2(-1, 0));
+        cogl_color_out = vec4(color.xyz, 1);
+    }
+}
+\ No newline at end of file