multiple scissors system

2 files changed, 62 insertions, 0 deletions

diff --git a/src/main/java/io/polyfrost/oneconfig/lwjgl/Scissor.java b/src/main/java/io/polyfrost/oneconfig/lwjgl/Scissor.java
new file mode 100644
index 0000000..dcd570a
--- /dev/null
+++ b/src/main/java/io/polyfrost/oneconfig/lwjgl/Scissor.java
@@ -0,0 +1,22 @@
+package io.polyfrost.oneconfig.lwjgl;
+
+public class Scissor {
+    public int x;
+    public int y;
+    public int width;
+    public int height;
+
+    public Scissor(int x, int y, int width, int height) {
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+    }
+
+    public Scissor(Scissor scissor) {
+        this.x = scissor.x;
+        this.y = scissor.y;
+        this.width = scissor.width;
+        this.height = scissor.height;
+    }
+}
diff --git a/src/main/java/io/polyfrost/oneconfig/lwjgl/ScissorManager.java b/src/main/java/io/polyfrost/oneconfig/lwjgl/ScissorManager.java
new file mode 100644
index 0000000..46d84b6
--- /dev/null
+++ b/src/main/java/io/polyfrost/oneconfig/lwjgl/ScissorManager.java
@@ -0,0 +1,40 @@
+package io.polyfrost.oneconfig.lwjgl;
+
+import org.lwjgl.nanovg.NanoVG;
+
+import java.util.ArrayList;
+
+public class ScissorManager {
+    private static final ArrayList<Scissor> scissors = new ArrayList<>();
+
+    public static Scissor scissor(long vg, int x, int y, int width, int height) {
+        Scissor scissor = new Scissor(x, y, width, height);
+        if (scissors.contains(scissor)) return scissor;
+        scissors.add(scissor);
+        applyScissors(vg);
+        return scissor;
+    }
+
+    public static void resetScissor(long vg, Scissor scissor) {
+        if (scissors.contains(scissor)) {
+            scissors.remove(scissor);
+            applyScissors(vg);
+        }
+    }
+
+    private static void applyScissors(long vg) {
+        NanoVG.nvgResetScissor(vg);
+        if (scissors.size() <= 0) return;
+        Scissor finalScissor = new Scissor(scissors.get(0));
+        for (int i = 1; i < scissors.size(); i++) {
+            Scissor scissor = scissors.get(i);
+            int rightX = Math.min(scissor.x + scissor.width, finalScissor.x + finalScissor.width);
+            int rightY = Math.min(scissor.y + scissor.height, finalScissor.y + finalScissor.height);
+            finalScissor.x = Math.max(finalScissor.x, scissor.x);
+            finalScissor.y = Math.max(finalScissor.y, scissor.y);
+            finalScissor.width = rightX - finalScissor.x;
+            finalScissor.height = rightY - finalScissor.y;
+        }
+        NanoVG.nvgScissor(vg, finalScissor.x, finalScissor.y, finalScissor.width, finalScissor.height);
+    }
+}