1 files changed, 15 insertions, 0 deletions
diff --git a/data/shaders/terrain-normalmap.frag b/data/shaders/terrain-normalmap.frag
new file mode 100644
index 0000000..74529ae
--- /dev/null
+++ b/data/shaders/terrain-normalmap.frag
@@ -0,0 +1,15 @@
+uniform float height;
+uniform vec2 resolution;
+uniform sampler2D heightMap;
+
+varying vec2 vUv;
+
+void main()
+{
+    float val = texture2D( heightMap, vUv ).x;
+
+    float valU = texture2D( heightMap, vUv + vec2( 1.0 / resolution.x, 0.0 ) ).x;
+    float valV = texture2D( heightMap, vUv + vec2( 0.0, 1.0 / resolution.y ) ).x;
+
+    gl_FragColor = vec4( ( 0.5 * normalize( vec3( val - valU, val - valV, height  ) ) + 0.5 ), 1.0 );
+}