Fragment-phase texture point-filtering, as a Unity GLSL shader

Texture Stepped.glsl.shader

/// @creator: Slipp Douglas Thompson
/// @license: WTFPL
/// @why: Too trivial to care.
/// @intersource: https://gist.github.com/capnslipp/02536fd06afe9428c381

Shader "Texture Stepped" {
	Properties {
		_MainTex ("Base (RGBA)", 2D) = "gray" {}
		_Step ("Step (XY)", Vector) = (32, 32, 0, 0)
	}
	SubShader {
		Tags {}
		Lighting Off
		ZWrite On
		
		Pass {
			GLSLPROGRAM
				/// @fix: explicit TRANSFORM_TEX(); Unity's preprocessor chokes when attempting to use the TRANSFORM_TEX() macro in UnityCG.glslinc
				/// 	(as of Unity 4.5.0f6; issue dates back to 2011 or earlier: http://forum.unity3d.com/threads/glsl-transform_tex-and-tiling.93756/)
				vec2 transformTex(vec4 texCoord, vec4 texST) {
					return (texCoord.xy * texST.xy + texST.zw);
				}
				
				
				#ifdef VERTEX
					uniform vec4 _MainTex_ST;
					
					#ifdef SHADER_API_GLES3
						out vec2 vTextureCoords;
					#else
						varying vec2 vTextureCoords;
					#endif
					
					void main()
					{
						vTextureCoords = transformTex(gl_MultiTexCoord0, _MainTex_ST);
						gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
					}
				#endif
				
				#ifdef FRAGMENT
					uniform sampler2D _MainTex;
					uniform ivec2 _Step;
					
					#ifdef SHADER_API_GLES3
						in vec2 vTextureCoords;
					#else
						varying vec2 vTextureCoords;
					#endif
					
					void main()
					{
						vec2 step_v2 = vec2(_Step);
						
						vec2 uv = floor(vTextureCoords * step_v2) / step_v2;
						gl_FragColor = texture2D(_MainTex, uv);
					}
				#endif
			ENDGLSL
		}
	}
	
	Fallback Off
}