Fix rare fade error when restarting the LodRenderer

core/src/main/java/com/seibel/distanthorizons/core/render/renderer/LodRenderer.java

@@ -804,6 +804,9 @@ public class LodRenderer
 				if (this.depthTexture != null)
 					this.depthTexture.destroy();
 				
+				this.setActiveDepthTextureId(-1);
+				this.setActiveColorTextureId(-1);
+				
 				EVENT_LOGGER.info("Renderer Cleanup Complete");
 			});
 		}

core/src/main/java/com/seibel/distanthorizons/core/render/renderer/shaders/FadeShader.java

@@ -155,6 +155,19 @@ public class FadeShader extends AbstractShaderRenderer
 	@Override
 	protected void onRender()
 	{
+		int depthTextureId = LodRenderer.getActiveDepthTextureId();
+		int colorTextureId = LodRenderer.getActiveColorTextureId();
+		
+		if (depthTextureId == -1
+			|| colorTextureId == -1)
+		{
+			// the renderer is currently being re-built and/or inactive,
+			// we don't need to/can't render fading
+			return;
+		}
+		
+		
+		
 		GLMC.glBindFramebuffer(GL32.GL_FRAMEBUFFER, this.frameBuffer);
 		GLMC.disableScissorTest();
 		GLMC.disableDepthTest();
@@ -165,8 +178,7 @@ public class FadeShader extends AbstractShaderRenderer
 		GL32.glUniform1i(this.uMcDepthTexture, 0);
 		
 		GLMC.glActiveTexture(GL32.GL_TEXTURE1);
-		// FIXME it's possible for this to return an invalid texture ID if the renderer is being re-built at the same time
-		GLMC.glBindTexture(LodRenderer.getActiveDepthTextureId());
+		GLMC.glBindTexture(depthTextureId);
 		GL32.glUniform1i(this.uDhDepthTexture, 1);
 		
 		GLMC.glActiveTexture(GL32.GL_TEXTURE2);
@@ -174,7 +186,7 @@ public class FadeShader extends AbstractShaderRenderer
 		GL32.glUniform1i(this.uCombinedMcDhColorTexture, 2);
 		
 		GLMC.glActiveTexture(GL32.GL_TEXTURE3);
-		GLMC.glBindTexture(LodRenderer.getActiveColorTextureId());
+		GLMC.glBindTexture(colorTextureId);
 		GL32.glUniform1i(this.uDhColorTexture, 3);