Fix Legacy GL causing fog to smear

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

@@ -167,6 +167,11 @@ public class FogShader extends AbstractShaderRenderer
 		GL32.glBindTexture(GL32.GL_TEXTURE_2D, LodRenderer.getActiveDepthTextureId());
 		GL32.glUniform1i(this.uDepthMap, 0);
 		
+		// this is necessary for MC 1.16 (IE Legacy OpenGL)
+		// otherwise the framebuffer isn't cleared correctly and the fog smears across the screen
+		GL32.glClear(GL32.GL_COLOR_BUFFER_BIT | GL32.GL_DEPTH_BUFFER_BIT);
+		
+		
 		ScreenQuad.INSTANCE.render();
 		
 		state.restore();