1 files changed, 39 insertions, 0 deletions
diff --git a/src/datavisualization/engine/shaders/surface_ES2.frag b/src/datavisualization/engine/shaders/surface_ES2.frag
new file mode 100644
index 00000000..a9aec528
--- /dev/null
+++ b/src/datavisualization/engine/shaders/surface_ES2.frag
@@ -0,0 +1,39 @@
+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 = dot(n, l);
+    if (cosTheta < 0.0) cosTheta = 0.0;
+    else if (cosTheta > 1.0) cosTheta = 1.0;
+
+    highp vec3 E = normalize(eyeDirection_cmr);
+    highp vec3 R = reflect(-l, n);
+    highp float cosAlpha = dot(E, R);
+    if (cosAlpha < 0.0) cosAlpha = 0.0;
+    else if (cosAlpha > 1.0) cosAlpha = 1.0;
+
+    gl_FragColor.rgb =
+        materialAmbientColor +
+        materialDiffuseColor * lightStrength * cosTheta * cosTheta / distance +
+        materialSpecularColor * lightStrength * cosAlpha * cosAlpha * cosAlpha * cosAlpha * cosAlpha * cosAlpha * cosAlpha * cosAlpha * cosAlpha * cosAlpha / distance;
+    gl_FragColor.a = 1.0;
+}
+