1 files changed, 36 insertions, 0 deletions
diff --git a/gsk/vulkan/resources/clip.vert.glsl b/gsk/vulkan/resources/clip.vert.glsl
new file mode 100644
index 0000000000..0dce1a0fb7
--- /dev/null
+++ b/gsk/vulkan/resources/clip.vert.glsl
@@ -0,0 +1,36 @@
+#include "constants.glsl"
+
+#ifndef _CLIP_
+#define _CLIP_
+
+vec4 intersect(vec4 a, vec4 b)
+{
+  a = vec4(a.xy, a.xy + a.zw);
+  b = vec4(b.xy, b.xy + b.zw);
+  vec4 result = vec4(max(a.xy, b.xy), min(a.zw, b.zw));
+  if (any (greaterThanEqual (result.xy, result.zw)))
+    return vec4(0.0,0.0,0.0,0.0);
+  return vec4(result.xy, result.zw - result.xy);
+}
+
+#ifdef CLIP_ROUNDED_RECT
+vec4 clip(vec4 rect)
+{
+  /* rounded corner clipping is done in fragment shader */
+  return intersect(rect, push.clip_bounds);
+}
+#elif defined(CLIP_RECT)
+vec4 clip(vec4 rect)
+{
+  return intersect(rect, push.clip_bounds);
+}
+#elif defined(CLIP_NONE)
+vec4 clip(vec4 rect)
+{
+  return rect;
+}
+#else
+#error "No clipping define given. Need CLIP_NONE, CLIP_RECT or CLIP_ROUNDED_RECT"
+#endif
+
+#endif