Atlas texture repeat example.

examples/resources/shaders/glsl330/atlas_repeat.fs

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+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec3 fragPosition;
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+
+uniform vec2 atlasSize;
+uniform vec2 tileTexSize;
+
+// Output fragment color
+out vec4 finalColor;
+
+vec2 texTileSize = tileTexSize / atlasSize;
+vec2 atlasTileSize = atlasSize / tileTexSize;
+
+void main() {
+	vec2 tileTexCoord = fract( vec2( fragPosition.x, fragPosition.y ) / tileTexSize );
+	// Get tile texture corner.
+	vec2 texOffset = floor( fragTexCoord / texTileSize ) * texTileSize;
+	vec2 fragCoord = tileTexCoord / atlasTileSize + texOffset;
+	vec4 texelColor = texture( texture0, fragCoord );
+
+	finalColor = texelColor * fragColor;
+}