Add support for GL_AMBIENT colorMode to shaders as required by particle systems

components/shader/shadervisitor.cpp

@@ -272,6 +272,9 @@ namespace Shader
         {
             switch (reqs.mVertexColorMode)
             {
+            case GL_AMBIENT:
+                defineMap["colorMode"] = "3";
+                break;
             default:
             case GL_AMBIENT_AND_DIFFUSE:
                 defineMap["colorMode"] = "2";

files/shaders/lighting.glsl

@@ -5,7 +5,10 @@ vec4 doLighting(vec3 viewPos, vec3 viewNormal, vec4 vertexColor)
     vec3 lightDir;
     float d;
 
-#if @colorMode == 2
+#if @colorMode == 3
+    vec4 diffuse = gl_FrontMaterial.diffuse;
+    vec3 ambient = vertexColor.xyz;
+#elif @colorMode == 2
     vec4 diffuse = vertexColor;
     vec3 ambient = vertexColor.xyz;
 #else