Fully works

src/main/resources/assets/zenith/shaders/lod/gl46/block_model.glsl

@@ -10,4 +10,8 @@ vec4 extractFaceSizes(uint faceData) {
 
 uint faceHasAlphaCuttout(uint faceData) {
     return (faceData>>22)&1;
+}
+
+uint faceHasAlphaCuttoutOverride(uint faceData) {
+    return (faceData>>23)&1;
 }

src/main/resources/assets/zenith/shaders/lod/gl46/cull/raster.vert

@@ -20,7 +20,8 @@ void main() {
     //Transform ipos with respect to the vertex corner
     ivec3 pos = (((ipos<<detail)-baseSectionPos)<<5);
     pos += aabbOffset;
-    pos += (ivec3(gl_VertexID&1, (gl_VertexID>>2)&1, (gl_VertexID>>1)&1)*size)*(1<<detail);
+    pos -= (1<<detail);
+    pos += (ivec3(gl_VertexID&1, (gl_VertexID>>2)&1, (gl_VertexID>>1)&1)*(size+1))*(1<<detail);
 
     gl_Position = MVP * vec4(vec3(pos),1);
 

src/main/resources/assets/zenith/shaders/lod/gl46/quads.frag

@@ -1,6 +1,9 @@
 #version 460 core
 layout(binding = 0) uniform sampler2D blockModelAtlas;
 
+//TODO: need to fix when merged quads have discardAlpha set to false but they span multiple tiles
+// however they are not a full block
+
 layout(location = 0) in vec2 uv;
 layout(location = 1) in flat vec2 baseUV;
 layout(location = 2) in flat vec4 colourTinting;

src/main/resources/assets/zenith/shaders/lod/gl46/quads.vert

@@ -60,8 +60,9 @@ void main() {
     vec3 corner = innerPos * (1<<lodLevel) + lodCorner;
 
     vec2 faceOffset = getFaceSizeOffset(faceData, cornerIdx);
-    vec2 quadSize = vec2(extractSize(quad) * ivec2((cornerIdx>>1)&1, cornerIdx&1));
-    vec2 size = (quadSize + faceOffset) * (1<<lodLevel);
+    ivec2 quadSize = extractSize(quad);
+    vec2 respectiveQuadSize = vec2(quadSize * ivec2((cornerIdx>>1)&1, cornerIdx&1));
+    vec2 size = (respectiveQuadSize + faceOffset) * (1<<lodLevel);
 
     vec3 offset = vec3(size, (float(face&1) + getDepthOffset(faceData, face)) * (1<<lodLevel));
 
@@ -84,10 +85,13 @@ void main() {
     //TODO: make the face orientated by 2x3 so that division is not a integer div and modulo isnt needed
     // as these are very slow ops
     baseUV = modelUV + (vec2(face%3, face/3) * (1f/(vec2(3,2)*256f)));
-    uv = quadSize + faceOffset;//Add in the face offset for 0,0 uv
+    uv = respectiveQuadSize + faceOffset;//Add in the face offset for 0,0 uv
 
     discardAlpha = faceHasAlphaCuttout(faceData);
 
+    //We need to have a conditional override based on if the model size is < a full face + quadSize > 1
+    discardAlpha |= uint(any(greaterThan(quadSize, ivec2(1)))) & faceHasAlphaCuttoutOverride(faceData);
+
     //Compute lighting
     colourTinting = getLighting(extractLightId(quad));