From 67f448a0980e83df8c9252b6b38911fb406cb11b Mon Sep 17 00:00:00 2001
From: bigfoot547 <bigfoot@figboot.dev>
Date: Fri, 14 Jun 2024 23:15:59 -0500
Subject: backface culling

---
 src/main/java/dev/figboot/cuberender/state/Framebuffer.java  | 5 +++++
 src/main/java/dev/figboot/cuberender/test/GraphicsPanel.java | 2 ++
 2 files changed, 7 insertions(+)

(limited to 'src/main/java')

diff --git a/src/main/java/dev/figboot/cuberender/state/Framebuffer.java b/src/main/java/dev/figboot/cuberender/state/Framebuffer.java
index 17f4870..8da0803 100644
--- a/src/main/java/dev/figboot/cuberender/state/Framebuffer.java
+++ b/src/main/java/dev/figboot/cuberender/state/Framebuffer.java
@@ -27,6 +27,7 @@ public class Framebuffer {
     @Setter private Matrix4f transform;
 
     @Setter private BlendMode blendMode = BlendMode.DISABLE;
+    @Setter private boolean cullBackFace = true;
 
     public Framebuffer(int width, int height) {
         this.width = width;
@@ -114,6 +115,10 @@ public class Framebuffer {
         vert2 = transform.transform(vert2);
         normal = transform.transform(normal).normalize();
 
+        if (cullBackFace && normal.z < 0) {
+            return;
+        }
+
         float sx0 = logToScrX(vert0.x), sy0 = logToScrY(vert0.y);
         float sx1 = logToScrX(vert1.x), sy1 = logToScrY(vert1.y);
         float sx2 = logToScrX(vert2.x), sy2 = logToScrY(vert2.y);
diff --git a/src/main/java/dev/figboot/cuberender/test/GraphicsPanel.java b/src/main/java/dev/figboot/cuberender/test/GraphicsPanel.java
index aa34853..2f7f1fc 100644
--- a/src/main/java/dev/figboot/cuberender/test/GraphicsPanel.java
+++ b/src/main/java/dev/figboot/cuberender/test/GraphicsPanel.java
@@ -315,6 +315,7 @@ public class GraphicsPanel extends JPanel {
 
         long start = System.nanoTime();
         framebuffer.setBlendMode(BlendMode.DISABLE);
+        framebuffer.setCullBackFace(true);
         framebuffer.clear(Framebuffer.FB_CLEAR_COLOR | Framebuffer.FB_CLEAR_DEPTH, 0xFF000000);
         long t1 = System.nanoTime();
 
@@ -327,6 +328,7 @@ public class GraphicsPanel extends JPanel {
 
         framebuffer.setDepthMode(Framebuffer.FB_DEPTH_USE | Framebuffer.FB_DEPTH_COMMIT_TRANSPARENT);
         framebuffer.setBlendMode(BlendMode.BLEND_OVER);
+        framebuffer.setCullBackFace(false);
         framebuffer.drawMesh(meshes.get(BodyPart.HAT));
         framebuffer.drawMesh(meshes.get(BodyPart.TORSO_OVERLAY));
         framebuffer.drawMesh(meshes.get(BodyPart.LEFT_ARM_OVERLAY));
-- 
cgit v1.2.3-70-g09d2