1 files changed, 39 insertions, 0 deletions
diff --git a/src/datavisualization/engine/shaders/surface.frag b/src/datavisualization/engine/shaders/surface.frag
new file mode 100644
index 00000000..9fe7f45b
--- /dev/null
+++ b/src/datavisualization/engine/shaders/surface.frag
@@ -0,0 +1,39 @@
+#version 120
+
+varying highp vec2 UV;
+varying highp vec3 coords_mdl;
+varying highp vec3 position_wrld;
+varying highp vec3 normal_cmr;
+varying highp vec3 eyeDirection_cmr;
+varying highp vec3 lightDirection_cmr;
+
+uniform sampler2D textureSampler;
+uniform highp vec3 lightPosition_wrld;
+uniform highp float lightStrength;
+uniform highp float ambientStrength;
+
+void main() {
+    highp vec2 gradientUV = vec2(0.5, (coords_mdl.y + 1.0) / 2.0);
+    highp vec3 materialDiffuseColor = texture2D(textureSampler, gradientUV).xyz;
+    highp vec3 materialAmbientColor = vec3(ambientStrength, ambientStrength, ambientStrength) * materialDiffuseColor;
+    highp vec3 materialSpecularColor = vec3(1.0, 1.0, 1.0);
+
+    highp float distance = length(lightPosition_wrld - position_wrld);
+
+    highp vec3 n = normalize(normal_cmr);
+    highp vec3 l = normalize(lightDirection_cmr);
+    highp float cosTheta = clamp(dot(n, l), 0.0, 1.0);
+
+    highp vec3 E = normalize(eyeDirection_cmr);
+    highp vec3 R = reflect(-l, n);
+    highp float cosAlpha = clamp(dot(E, R), 0.0, 1.0);
+
+//    gl_FragColor.rgb = materialDiffuseColor;
+    gl_FragColor.rgb =
+        materialAmbientColor +
+        materialDiffuseColor * lightStrength * pow(cosTheta, 2) / distance +
+        materialSpecularColor * lightStrength * pow(cosAlpha, 10) / distance;
+    gl_FragColor.a = 1.0;
+//    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
+}
+