Don't globally set float precision to mediump, only fragment shaders need that and defining it for vertex shaders causes tilemap cracks. Also manually define low precision for variables that hold color / alpha values.
		
			
				
	
	
		
			7 lines
		
	
	
	
		
			70 B
		
	
	
	
		
			GLSL
		
	
	
	
	
	
			
		
		
	
	
			7 lines
		
	
	
	
		
			70 B
		
	
	
	
		
			GLSL
		
	
	
	
	
	
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varying lowp vec4 v_color;
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void main()
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{
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	gl_FragColor = v_color;
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}
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