Add functionality to fake blockId for shaders

src/main/java/com/gtnewhorizon/gtnhlib/client/renderer/CapturingTessellator.java

@@ -39,6 +39,7 @@ public class CapturingTessellator extends Tessellator implements ITessellatorIns
     private final Quad.Flags FLAGS = new Quad.Flags(true, true, true, true);
     private final ObjectPooler<QuadView> quadBuf = new ObjectPooler<>(Quad::new);
     private final List<QuadView> collectedQuads = new ObjectArrayList<>();
+    private int shaderBlockId = -1;
 
     // Any offset we need to the Tesselator's offset!
     private final BlockPos offset = new BlockPos();
@@ -101,6 +102,7 @@ public int draw() {
                     -offset.x,
                     -offset.y,
                     -offset.z);
+            quad.setShaderBlockId(shaderBlockId);
 
             if (quad.isDeleted()) {
                 quadBuf.releaseInstance(quad);
@@ -249,4 +251,15 @@ public void ensureBuffer() {
         }
     }
 
+    public void setShaderBlockId(int blockId) {
+        // Flush queue, so we capture the blockId in quads before we change it
+        if (isDrawing) {
+            draw();
+            isDrawing = true;
+        }
+
+        // Now set new blockId
+        shaderBlockId = blockId;
+    }
+
 }

src/main/java/com/gtnewhorizon/gtnhlib/client/renderer/quad/Quad.java

@@ -46,6 +46,7 @@ public class Quad implements QuadView {
     @Getter
     private ForgeDirection face;
     private int colorIndex = -1;
+    private int shaderBlockId = -1;
     private TextureAtlasSprite sprite = null;
 
     /** Returns the face, forced to take one of 6 directions to mirror the behavior of baked quads in 1.16.5. */
@@ -109,6 +110,11 @@ public int getColorIndex() {
         return this.colorIndex;
     }
 
+    @Override
+    public int getShaderBlockId() {
+        return this.shaderBlockId;
+    }
+
     @Override
     public TextureAtlasSprite rubidium$getSprite() {
         return this.sprite;
@@ -174,6 +180,11 @@ public void setSprite(TextureAtlasSprite sprite) {
         this.sprite = sprite;
     }
 
+    @Override
+    public void setShaderBlockId(int shaderBlockId) {
+        this.shaderBlockId = shaderBlockId;
+    }
+
     @Override
     public int[] getRawData() {
         return this.data;

src/main/java/com/gtnewhorizon/gtnhlib/client/renderer/quad/QuadView.java

@@ -22,6 +22,10 @@ static QuadView allocate() {
 
     int[] getRawData();
 
+    void setShaderBlockId(int shaderBlockId);
+
+    int getShaderBlockId();
+
     /**
      * Present for compatibility with the Tesselator, not recommended for general use.
      */