Merge pull request #86 from shedaniel/1.14-dev

REi v2.9 (WIP)

1 files changed, 38 insertions, 0 deletions

diff --git a/src/main/java/com/zeitheron/hammercore/client/utils/Scissors.java b/src/main/java/com/zeitheron/hammercore/client/utils/Scissors.java
new file mode 100644
index 000000000..36d56329d
--- /dev/null
+++ b/src/main/java/com/zeitheron/hammercore/client/utils/Scissors.java
@@ -0,0 +1,38 @@
+package com.zeitheron.hammercore.client.utils;
+
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.util.Window;
+import org.lwjgl.opengl.GL11;
+
+/**
+ * This is originally the part of Hammer Lib, repacked in REI with permission.
+ * Adapted GL scissor for minecraft pixel resolution and adjusts (0;0) as left-top corner.
+ *
+ * @author Zeitheron
+ */
+public class Scissors {
+    public static void begin() {
+        GL11.glEnable(GL11.GL_SCISSOR_TEST);
+    }
+    
+    public static void scissor(int x, int y, int width, int height) {
+        Window window = MinecraftClient.getInstance().window;
+        
+        int sw = window.getWidth();
+        int sh = window.getHeight();
+        float dw = window.getScaledWidth();
+        float dh = window.getScaledHeight();
+        
+        x = Math.round(sw * (x / dw));
+        y = Math.round(sh * (y / dh));
+        
+        width = Math.round(sw * (width / dw));
+        height = Math.round(sh * (height / dh));
+        
+        GL11.glScissor(x, sh - height - y, width, height);
+    }
+    
+    public static void end() {
+        GL11.glDisable(GL11.GL_SCISSOR_TEST);
+    }
+}
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