match sodium culling

src/main/resources/assets/voxy/shaders/chunkoutline/outline.vsh

@@ -1,9 +1,9 @@
 #version 460
 
-layout(location = 0) out vec2 uv;
 layout(binding = 0, std140) uniform SceneUniform {
     mat4 MVP;
     ivec4 section;
+    vec4 negInnerSec;
 };
 
 layout(binding = 1, std430) restrict readonly buffer ChunkPosBuffer {
@@ -14,12 +14,24 @@ ivec3 unpackPos(ivec2 pos) {
     return ivec3(pos.y>>10, (pos.x<<12)>>12, ((pos.y<<22)|int(uint(pos.x)>>10))>>10);
 }
 
+bool shouldRender(ivec3 icorner) {
+    vec3 corner = vec3(icorner*16)+negInnerSec.xyz;
+    //closest point TODO: OPTIMIZE
+    corner = mix(mix(vec3(0), corner, lessThan(vec3(0), corner)), corner+16, lessThan(corner+16, vec3(0)));
+    return (corner.x*corner.x + corner.z*corner.z < negInnerSec.w*negInnerSec.w) && abs(corner.y) < negInnerSec.w;
+}
+
 void main() {
     uint id = (gl_InstanceID<<5)+gl_BaseInstance+(gl_VertexID>>3);
 
     ivec3 origin = unpackPos(chunkPos[id]);
     origin -= section.xyz;
 
+    if (!shouldRender(origin)) {
+        gl_Position = vec4(-100.0f, -100.0f, -100.0f, 0.0f);
+        return;
+    }
+
     ivec3 cubeCornerI = ivec3(gl_VertexID&1, (gl_VertexID>>2)&1, (gl_VertexID>>1)&1);
     //Expand the y height to be big (will be +- 8192)
     //TODO: make it W.R.T world height and offsets