diff --git a/src/gpu/tile.lolfx b/src/gpu/tile.lolfx
index 962a569d..f38f5200 100644
--- a/src/gpu/tile.lolfx
+++ b/src/gpu/tile.lolfx
@@ -26,45 +26,12 @@ precision mediump float;
 #endif
 
 uniform sampler2D in_Texture;
+uniform vec2 in_TexSize;
 varying vec2 pass_TexCoord;
 
 void main()
 {
     vec4 col = texture2D(in_Texture, pass_TexCoord);
-//    vec4 col = vec4(0.5, 1.0, 0.0, 0.5);
-//    vec4 col = vec4(pass_TexCoord * 4.0, 0.0, 0.25);
-
-#if 0
-    float mul = 2.0;
-#   if 1
-    vec2 d1 = mod(vec2(gl_FragCoord), vec2(2.0, 2.0));
-    float t1 = mod(3.0 * d1.x + 2.0 * d1.y, 4.0);
-    float dx2 = mod(floor(gl_FragCoord.x * 0.5), 2.0);
-    float dy2 = mod(floor(gl_FragCoord.y * 0.5), 2.0);
-    float t2 = mod(3.0 * dx2 + 2.0 * dy2, 4.0);
-    float dx3 = mod(floor(gl_FragCoord.x * 0.25), 2.0);
-    float dy3 = mod(floor(gl_FragCoord.y * 0.25), 2.0);
-    float t3 = mod(3.0 * dx3 + 2.0 * dy3, 4.0);
-    t1 = (1.0 + 16.0 * t1 + 4.0 * t2 + t3) / 65.0;
-    t2 = t1;
-    t3 = t1;
-#   else
-    float rand = sin(gl_FragCoord.x * 1.23456) * 123.456
-               + cos(gl_FragCoord.y * 2.34567) * 789.012;
-    float t1 = mod(sin(rand) * 17.13043, 1.0);
-    float t2 = mod(sin(rand) * 27.13043, 1.0);
-    float t3 = mod(sin(rand) * 37.13043, 1.0);
-#   endif
-    float fracx = fract(col.x * mul);
-    float fracy = fract(col.y * mul);
-    float fracz = fract(col.z * mul);
-    fracx = fracx > t1 ? 1.0 : 0.0;
-    fracy = fracy > t2 ? 1.0 : 0.0;
-    fracz = fracz > t3 ? 1.0 : 0.0;
-    col.x = (floor(col.x * mul) + fracx) / mul;
-    col.y = (floor(col.y * mul) + fracy) / mul;
-    col.z = (floor(col.z * mul) + fracz) / mul;
-#endif
     gl_FragColor = col;
 }
 
@@ -85,46 +52,12 @@ void main(float4 in_Position : POSITION,
 [frag.hlsl]
 
 void main(float2 in_TexCoord : TEXCOORD0,
-#if 0
-          float4 in_FragCoord : WPOS,
-#endif
-          uniform sampler2D tex,
+          uniform sampler2D in_Texture,
+          uniform float2 in_TexSize,
           out float4 out_FragColor : COLOR)
 {
-    float4 col = tex2D(tex, in_TexCoord);
-#if 0
-    float mul = 2.0;
-    float t1, t2, t3;
-#   if 1
-    float dx1 = frac(in_FragCoord.x * 0.5) * 2.0;
-    float dy1 = frac(in_FragCoord.y * 0.5) * 2.0;
-    t1 = frac((3.0 * dx1 + 2.0 * dy1) / 4.0) * 4.0;
-    float dx2 = frac(floor(in_FragCoord.x * 0.5) * 0.5) * 2.0;
-    float dy2 = frac(floor(in_FragCoord.y * 0.5) * 0.5) * 2.0;
-    t2 = frac((3.0 * dx2 + 2.0 * dy2) / 4.0) * 4.0;
-    float dx3 = frac(floor(in_FragCoord.x * 0.25) * 0.5) * 2.0;
-    float dy3 = frac(floor(in_FragCoord.y * 0.25) * 0.5) * 2.0;
-    t3 = frac((3.0 * dx3 + 2.0 * dy3) / 4.0) * 4.0;
-    t1 = (1.0 + 4.0 * t1 + t2) / 17.0;
-    t2 = t1;
-    t3 = t1;
-#   else
-    float rand = sin(in_FragCoord.x * 1.23456) * 123.456
-               + cos(in_FragCoord.y * 2.34567) * 789.012;
-    t1 = frac(sin(rand) * 17.13043);
-    t2 = frac(sin(rand) * 27.13043);
-    t3 = frac(sin(rand) * 37.13043);
-#   endif
-    float fracx = frac(col.x * mul);
-    float fracy = frac(col.y * mul);
-    float fracz = frac(col.z * mul);
-    fracx = fracx > t1 ? 1.0 : 0.0;
-    fracy = fracy > t2 ? 1.0 : 0.0;
-    fracz = fracz > t3 ? 1.0 : 0.0;
-    col.x = (floor(col.x * mul) + fracx) / mul;
-    col.y = (floor(col.y * mul) + fracy) / mul;
-    col.z = (floor(col.z * mul) + fracz) / mul;
-#endif
+    float2 delta = float2(-0.5, -0.5) / in_TexSize;
+    float4 col = tex2D(in_Texture, in_TexCoord + delta);
     out_FragColor = col;
 }
 
diff --git a/src/scene.cpp b/src/scene.cpp
index 0270493b..5d7e9361 100644
--- a/src/scene.cpp
+++ b/src/scene.cpp
@@ -224,7 +224,7 @@ void Scene::Render() // XXX: rename to Blit()
         qsort(&data->m_tiles[0], data->m_tiles.Count(),
               sizeof(Tile), SceneData::Compare);
 
-        ShaderUniform uni_mat, uni_tex;
+        ShaderUniform uni_mat, uni_tex, uni_texsize;
         ShaderAttrib attr_pos, attr_tex;
         attr_pos = data->m_tile_shader->GetAttribLocation("in_Position", VertexUsage::Position, 0);
         attr_tex = data->m_tile_shader->GetAttribLocation("in_TexCoord", VertexUsage::TexCoord, 0);
@@ -240,6 +240,7 @@ void Scene::Render() // XXX: rename to Blit()
 
         uni_tex = data->m_tile_shader->GetUniformLocation("in_Texture");
         data->m_tile_shader->SetUniform(uni_tex, 0);
+        uni_texsize = data->m_tile_shader->GetUniformLocation("in_TexSize");
 
         for (int buf = 0, i = 0, n; i < data->m_tiles.Count(); i = n, buf += 2)
         {
@@ -270,6 +271,8 @@ void Scene::Render() // XXX: rename to Blit()
 
             /* Bind texture */
             data->m_tiles[i].tileset->Bind();
+            data->m_tile_shader->SetUniform(uni_texsize,
+                                   data->m_tiles[i].tileset->GetImageSize());
 
             /* Bind vertex and texture coordinate buffers */
             data->m_tile_vdecl->Bind();
diff --git a/src/tileset.cpp b/src/tileset.cpp
index af3e3b40..5751e102 100644
--- a/src/tileset.cpp
+++ b/src/tileset.cpp
@@ -177,6 +177,11 @@ ivec2 TileSet::GetSize(int tileid) const
     return data->size;
 }
 
+vec2 TileSet::GetImageSize() const
+{
+    return vec2(data->isize);
+}
+
 vec2 TileSet::GetTileSize() const
 {
     return vec2(data->tx, data->ty);
diff --git a/src/tileset.h b/src/tileset.h
index 0b8984fc..09b08864 100644
--- a/src/tileset.h
+++ b/src/tileset.h
@@ -43,6 +43,7 @@ public:
     /* New methods */
     ivec2 GetCount() const;
     ivec2 GetSize(int tileid) const;
+    vec2 GetImageSize() const;
     vec2 GetTileSize() const;
     ShaderTexture GetTexture() const;
     void Bind();