Shaders loaded from files

resources/shaders/gouraud.fs

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+#version 110
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+varying vec3 delta_box_min;
+varying vec3 delta_box_max;
+
+uniform vec4 uniform_color;
+
+void main()
+{
+    // if the fragment is outside the print volume -> use darker color
+    vec3 color = (any(lessThan(delta_box_min, ZERO)) || any(greaterThan(delta_box_max, ZERO))) ? mix(uniform_color.rgb, ZERO, 0.3333) : uniform_color.rgb;
+    gl_FragColor = vec4(vec3(intensity.y, intensity.y, intensity.y) + color * intensity.x, uniform_color.a);
+}

resources/shaders/gouraud.vs

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+#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();
+} 

resources/shaders/variable_layer_height.fs

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+#version 110
+
+#define M_PI 3.1415926535897932384626433832795
+
+// 2D texture (1D texture split by the rows) of color along the object Z axis.
+uniform sampler2D z_texture;
+// Scaling from the Z texture rows coordinate to the normalized texture row coordinate.
+uniform float z_to_texture_row;
+uniform float z_texture_row_to_normalized;
+uniform float z_cursor;
+uniform float z_cursor_band_width;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+varying float object_z;
+
+void main()
+{
+    float object_z_row = z_to_texture_row * object_z;
+    // Index of the row in the texture.
+    float z_texture_row = floor(object_z_row);
+    // Normalized coordinate from 0. to 1.
+    float z_texture_col = object_z_row - z_texture_row;
+    float z_blend = 0.25 * cos(min(M_PI, abs(M_PI * (object_z - z_cursor) * 1.8 / z_cursor_band_width))) + 0.25;
+    // Calculate level of detail from the object Z coordinate.
+    // This makes the slowly sloping surfaces to be show with high detail (with stripes),
+    // and the vertical surfaces to be shown with low detail (no stripes)
+    float z_in_cells = object_z_row * 190.;
+    // Gradient of Z projected on the screen.
+    float dx_vtc = dFdx(z_in_cells);
+    float dy_vtc = dFdy(z_in_cells);
+    float lod = clamp(0.5 * log2(max(dx_vtc * dx_vtc, dy_vtc * dy_vtc)), 0., 1.);
+    // Sample the Z texture. Texture coordinates are normalized to <0, 1>.
+    vec4 color = mix(texture2D(z_texture, vec2(z_texture_col, z_texture_row_to_normalized * (z_texture_row + 0.5    )), -10000.),
+                     texture2D(z_texture, vec2(z_texture_col, z_texture_row_to_normalized * (z_texture_row * 2. + 1.)),  10000.), lod);
+            
+    // Mix the final color.
+    gl_FragColor = vec4(intensity.y, intensity.y, intensity.y, 1.0) +  intensity.x * mix(color, vec4(1.0, 1.0, 0.0, 1.0), z_blend);
+}

resources/shaders/variable_layer_height.vs

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+#version 110
+
+#define INTENSITY_CORRECTION 0.6
+
+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
+
+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
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+varying float object_z;
+
+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)
+    NdotL = max(dot(normal, LIGHT_FRONT_DIR), 0.0);
+    
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+    
+    // Scaled to widths of the Z texture.
+    object_z = gl_Vertex.z;
+
+    gl_Position = ftransform();
+}