Tech ENABLE_GL_SHADERS_ATTRIBUTES - Added shaders for glsl version 140

(cherry picked from commit prusa3d/PrusaSlicer@76d1d4949b)

resources/shaders/140/gouraud.fs

@@ -0,0 +1,105 @@
+#version 140
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+//BBS: add grey and orange
+//const vec3 GREY = vec3(0.9, 0.9, 0.9);
+const vec3 ORANGE = vec3(0.8, 0.4, 0.0);
+const vec3 LightRed = vec3(0.78, 0.0, 0.0);
+const vec3 LightBlue = vec3(0.73, 1.0, 1.0);
+const float EPSILON = 0.0001;
+
+struct PrintVolumeDetection
+{
+	// 0 = rectangle, 1 = circle, 2 = custom, 3 = invalid
+	int type;
+    // type = 0 (rectangle):
+    // x = min.x, y = min.y, z = max.x, w = max.y
+    // type = 1 (circle):
+    // x = center.x, y = center.y, z = radius
+	vec4 xy_data;
+    // x = min z, y = max z
+	vec2 z_data;
+};
+
+struct SlopeDetection
+{
+    bool actived;
+	float normal_z;
+    mat3 volume_world_normal_matrix;
+};
+
+uniform vec4 uniform_color;
+uniform SlopeDetection slope;
+
+//BBS: add outline_color
+uniform bool is_outline;
+
+uniform bool offset_depth_buffer;
+
+#ifdef ENABLE_ENVIRONMENT_MAP
+    uniform sampler2D environment_tex;
+    uniform bool use_environment_tex;
+#endif // ENABLE_ENVIRONMENT_MAP
+
+uniform PrintVolumeDetection print_volume;
+
+in vec3 clipping_planes_dots;
+
+// x = diffuse, y = specular;
+in vec2 intensity;
+
+in vec4 world_pos;
+in float world_normal_z;
+in vec3 eye_normal;
+
+void main()
+{
+    if (any(lessThan(clipping_planes_dots, ZERO)))
+        discard;
+    vec3  color = uniform_color.rgb;
+    float alpha = uniform_color.a;
+
+    if (slope.actived) {
+         if(world_pos.z<0.1&&world_pos.z>-0.1)
+         {
+                color = LightBlue;
+                alpha = 0.8;
+         }
+         else if( world_normal_z < slope.normal_z - EPSILON)
+         {
+                color = color * 0.5 + LightRed * 0.5;
+                alpha = 0.8;
+         }
+    }
+	// if the fragment is outside the print volume -> use darker color
+    vec3 pv_check_min = ZERO;
+    vec3 pv_check_max = ZERO;
+    if (print_volume.type == 0) {
+        // rectangle
+        pv_check_min = world_pos.xyz - vec3(print_volume.xy_data.x, print_volume.xy_data.y, print_volume.z_data.x);
+        pv_check_max = world_pos.xyz - vec3(print_volume.xy_data.z, print_volume.xy_data.w, print_volume.z_data.y);
+        color = (any(lessThan(pv_check_min, ZERO)) || any(greaterThan(pv_check_max, ZERO))) ? mix(color, ZERO, 0.3333) : color;
+    }
+    else if (print_volume.type == 1) {
+        // circle
+        float delta_radius = print_volume.xy_data.z - distance(world_pos.xy, print_volume.xy_data.xy);
+        pv_check_min = vec3(delta_radius, 0.0, world_pos.z - print_volume.z_data.x);
+        pv_check_max = vec3(0.0, 0.0, world_pos.z - print_volume.z_data.y);
+        color = (any(lessThan(pv_check_min, ZERO)) || any(greaterThan(pv_check_max, ZERO))) ? mix(color, ZERO, 0.3333) : color;
+    }
+
+	//BBS: add outline_color
+	if (is_outline)
+		gl_FragColor = uniform_color;
+#ifdef ENABLE_ENVIRONMENT_MAP
+    else if (use_environment_tex)
+        gl_FragColor = vec4(0.45 * texture(environment_tex, normalize(eye_normal).xy * 0.5 + 0.5).xyz + 0.8 * color * intensity.x, alpha);
+#endif
+	else
+        gl_FragColor = vec4(vec3(intensity.y) + color * intensity.x, alpha);
+		
+    // In the support painting gizmo and the seam painting gizmo are painted triangles rendered over the already
+    // rendered object. To resolved z-fighting between previously rendered object and painted triangles, values
+    // inside the depth buffer are offset by small epsilon for painted triangles inside those gizmos.
+    gl_FragDepth = gl_FragCoord.z - (offset_depth_buffer ? EPSILON : 0.0);
+}