Add proper frustum check

src/main/resources/assets/voxy/shaders/lod/frustum.glsl

@@ -0,0 +1,14 @@
+struct Frustum {
+    vec4 planes[6];
+};
+
+bool testPlane(vec4 plane, vec3 base, float size) {
+    return dot(plane.xyz, base+mix(vec3(size), vec3(0), lessThan(plane.xyz, vec3(0)))) >= -plane.w;
+}
+
+//TODO: optimize this, this can be done by computing the base point value, then multiplying and adding a seperate value by the size
+bool outsideFrustum(in Frustum frustum, vec3 pos, float size) {
+    return !(testPlane(frustum.planes[0], pos, size) && testPlane(frustum.planes[1], pos, size) &&
+           testPlane(frustum.planes[2], pos, size) && testPlane(frustum.planes[3], pos, size) &&
+           testPlane(frustum.planes[4], pos, size));//Dont need to test far plane
+}

src/main/resources/assets/voxy/shaders/lod/hierarchical/screenspace.glsl

@@ -58,13 +58,16 @@ void setupScreenspace(in UnpackedNode node) {
                     + (transform.worldPos.xyz-camChunkPos))-camSubChunk);
                     */
 
-    //TODO: AABB SIZES not just a max cube
-
-    //vec3 minPos = minSize + basePos;
-    //vec3 maxPos = maxSize + basePos;
 
     vec3 basePos = vec3(((node.pos<<node.lodLevel)-camSecPos)<<5)-camSubSecPos;
 
+    insideFrustum = !outsideFrustum(frustum, basePos, float(32<<node.lodLevel));
+
+    //Fast exit
+    if (!insideFrustum) {
+        return;
+    }
+
     vec4 P000 = VP * vec4(basePos, 1);
     mat3x4 Axis = mat3x4(VP) * float(32<<node.lodLevel);
 
@@ -76,13 +79,6 @@ void setupScreenspace(in UnpackedNode node) {
     vec4 P011 = Axis[1] + P001;
     vec4 P111 = Axis[1] + P101;
 
-    insideFrustum = checkPointInView(P000) || checkPointInView(P100) || checkPointInView(P001) || checkPointInView(P101) ||
-                    checkPointInView(P010) || checkPointInView(P110) || checkPointInView(P011) || checkPointInView(P111);
-
-    //Fast exit
-    if (!insideFrustum) {
-        return;
-    }
 
     //Perspective divide + convert to screenspace (i.e. range 0->1 if within viewport)
     vec3 p000 = (P000.xyz/P000.w) * 0.5f + 0.5f;

src/main/resources/assets/voxy/shaders/lod/hierarchical/traversal_dev.comp

@@ -5,12 +5,15 @@
 #define LOCAL_SIZE (1<<LOCAL_SIZE_BITS)
 layout(local_size_x=LOCAL_SIZE) in;//, local_size_y=1
 
+#import <voxy:lod/frustum.glsl>
+
 layout(binding = SCENE_UNIFORM_BINDING, std140) uniform SceneUniform {
     mat4 VP;
     ivec3 camSecPos;
     float screenW;
     vec3 camSubSecPos;
     float screenH;
+    Frustum frustum;
     uint renderQueueMaxSize;
     float minSSS;
     uint frameId;