Shaders loaded from files

resources/shaders/gouraud.vs

@@ -0,0 +1,70 @@
+#version 110
+
+#define INTENSITY_CORRECTION 0.6
+
+// normalized values for (-0.6/1.31, 0.6/1.31, 1./1.31)
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+// normalized values for (1./1.43, 0.2/1.43, 1./1.43)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+//#define LIGHT_FRONT_SPECULAR (0.0 * INTENSITY_CORRECTION)
+//#define LIGHT_FRONT_SHININESS 5.0
+
+#define INTENSITY_AMBIENT    0.3
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+struct PrintBoxDetection
+{
+    vec3 min;
+    vec3 max;
+    // xyz contains the offset, if w == 1.0 detection needs to be performed
+    vec4 volume_origin;
+};
+
+uniform PrintBoxDetection print_box;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+varying vec3 delta_box_min;
+varying vec3 delta_box_max;
+
+void main()
+{
+    // First transform the normal into camera space and normalize the result.
+    vec3 normal = normalize(gl_NormalMatrix * gl_Normal);
+    
+    // Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
+    // Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
+    float NdotL = max(dot(normal, LIGHT_TOP_DIR), 0.0);
+
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    intensity.y = 0.0;
+
+    if (NdotL > 0.0)
+        intensity.y += LIGHT_TOP_SPECULAR * pow(max(dot(normal, reflect(-LIGHT_TOP_DIR, normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    // Perform the same lighting calculation for the 2nd light source (no specular applied).
+    NdotL = max(dot(normal, LIGHT_FRONT_DIR), 0.0);
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+    // compute deltas for out of print volume detection (world coordinates)
+    if (print_box.volume_origin.w == 1.0)
+    {
+        vec3 v = gl_Vertex.xyz + print_box.volume_origin.xyz;
+        delta_box_min = v - print_box.min;
+        delta_box_max = v - print_box.max;
+    }
+    else
+    {
+        delta_box_min = ZERO;
+        delta_box_max = ZERO;
+    }    
+
+    gl_Position = ftransform();
+}