Implement separate conditions for drawing 3D axes and objects

GUI/ba3d/ba3d/shaders/fragment_shader.frag

@@ -2,29 +2,40 @@ uniform highp vec3 lightPos1;
 uniform highp vec4 color;
 uniform highp float ambient;
 uniform highp vec3 eye;
+uniform highp bool axis;
 
-varying highp vec3 vo, nm;
+varying highp vec3 vo, nm, ac;
 
 void main() {
-    // ambient
-    highp vec3 amb_col = ambient * color.rgb;
+    if (axis)
+    {
+        // for drawing colored 3D axes
+        gl_FragColor = vec4(ac, 1.0);
+    }
+    else
+    {
+        // for drawing 3D objects
 
-    // diffuse
-    highp vec3  L1  = normalize(lightPos1 - vo);
-    highp vec3  N  = normalize(nm);
-    highp float NL_sum = dot(N,L1);
-    highp float NL = 0.6*max(0.0, NL_sum);
-    highp vec3 diff_col = NL * color.rgb;
+        // ambient
+        highp vec3 amb_col = ambient * color.rgb;
 
-    // specular
-    float spec = 0.0;
-    highp vec3 E = normalize(eye-vo);
-    highp float ELN1 = pow(max(0.0, dot(E, reflect(-L1, N))), 20.0);
-    if(NL > 0.0)
-        spec = ELN1;
-    vec3 spec_col = spec * vec3(1.0, 1.0, 1.0);
+        // diffuse
+        highp vec3  L1  = normalize(lightPos1 - vo);
+        highp vec3  N  = normalize(nm);
+        highp float NL_sum = dot(N,L1);
+        highp float NL = 0.6*max(0.0, NL_sum);
+        highp vec3 diff_col = NL * color.rgb;
 
-    highp vec3 tot_col = amb_col + diff_col + spec_col;
-    highp vec4 C = vec4(tot_col, color.a);
-    gl_FragColor = clamp(C, 0.0, 1.0);
+        // specular
+        float spec = 0.0;
+        highp vec3 E = normalize(eye-vo);
+        highp float ELN1 = pow(max(0.0, dot(E, reflect(-L1, N))), 20.0);
+        if(NL > 0.0)
+            spec = ELN1;
+        vec3 spec_col = spec * vec3(1.0, 1.0, 1.0);
+
+        highp vec3 tot_col = amb_col + diff_col + spec_col;
+        highp vec4 C = vec4(tot_col, color.a);
+        gl_FragColor = clamp(C, 0.0, 1.0);
+    }
 }