Get full existing shader function working on HDMap

src/main/java/org/dynmap/hdmap/HDShaderState.java

@@ -0,0 +1,40 @@
+package org.dynmap.hdmap;
+
+import org.dynmap.Color;
+import org.dynmap.utils.MapChunkCache;
+import org.dynmap.utils.MapIterator;
+
+/**
+ * This interface is used to define the operational state of a renderer during raytracing
+ * All method should be considered performance critical
+ */
+public interface HDShaderState {
+    /**
+     * Reset renderer state for new ray - passes in pixel coordinate for ray
+     */
+    void reset(int x, int y);
+    /**
+     * Process next ray step - called for each block on route
+     * @param blocktype - block type of current block
+     * @param blockdata - data nibble of current block
+     * @param skylightlevel - sky light level of previous block (surface on current block)
+     * @param emittedlightlevel - emitted light level of previous block (surface on current block)
+     * @param laststep - direction of last step
+     * @return true if ray is done, false if ray needs to continue
+     */
+    boolean processBlock(int blocktype, int blockdata, int skylightlevel, int emittedlightlevel, HDMap.BlockStep laststep);
+    /**
+     * Ray ended - used to report that ray has exited map (called if renderer has not reported complete)
+     */
+    void rayFinished();
+    /**
+     * Get result color - get resulting color for ray
+     * @param c - object to store color value in
+     * @param index - index of color to request (renderer specific - 0=default, 1=day for night/day renderer
+     */
+    void getRayColor(Color c, int index);
+    /**
+     * Clean up state object - called after last ray completed
+     */
+    void cleanup();
+}