Move GLStateTracker into 1.7.10 project

versions/1.7.10/src/main/java/com/replaymod/render/hooks/GLStateTracker.java

@@ -0,0 +1,44 @@
+package com.replaymod.render.hooks;
+
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL13;
+
+/**
+ * Tracks OpenGL state for use in the ODS shader.
+ * All methods should be called from the GL mixins only.
+ */
+public class GLStateTracker {
+    private static ThreadLocal<GLStateTracker> stateTracker = ThreadLocal.withInitial(GLStateTracker::new);
+    public static GLStateTracker getInstance() {
+        return stateTracker.get();
+    }
+
+    public int activeTexture;
+
+    public void updateActiveTexture(int magic) {
+        this.activeTexture = magic - GL13.GL_TEXTURE0;
+    }
+
+    public void updateEnabledState(int magic, boolean enabled) {
+        switch (magic) {
+            case GL11.GL_FOG: FogStateCallback.EVENT.invoker().fogStateChanged(enabled); break;
+            case GL11.GL_TEXTURE_2D: Texture2DStateCallback.EVENT.invoker().texture2DStateChanged(activeTexture, enabled); break;
+        }
+    }
+
+    // Called via ASM (see GLStateTrackerTransformer)
+    @Deprecated
+    @SuppressWarnings("unused")
+    public static void hook_glEnable(int magic) {
+        GL11.glEnable(magic);
+        getInstance().updateEnabledState(magic, true);
+    }
+
+    // Called via ASM (see GLStateTrackerTransformer)
+    @Deprecated
+    @SuppressWarnings("unused")
+    public static void hook_glDisable(int magic) {
+        GL11.glDisable(magic);
+        getInstance().updateEnabledState(magic, false);
+    }
+}