Add support for vertex colors in splattig shader

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@10455 178a84e3-b1eb-0310-8ba1-8eac791a3b58

data/shaders/splatting.frag

@@ -8,6 +8,7 @@ uniform sampler2D tex_detail3;
 uniform sampler2D tex_detail4;
 varying vec3 normal;
 varying vec3 lightdir2;
+varying vec4 vertex_color;
 
 void main()
 {
@@ -23,5 +24,5 @@ void main()
                     splatting.b * detail2 +
                     (1.0 - splatting.r - splatting.g - splatting.b) * detail3 +
                     (1.0 - splatting.a) * detail4)
-                    * min(1.0, 0.2 + dot(lightdir2, normal)); // 0.2 is the ambient light.
+                    * min(1.0, 0.2 + dot(lightdir2, normal)) * vertex_color; // 0.2 is the ambient light.
 }

data/shaders/splatting.vert

@@ -1,5 +1,5 @@
 varying vec3 normal;
-
+varying vec4 vertex_color;
 varying vec3 lightdir2;
 uniform vec3 lightdir;
 
@@ -8,6 +8,7 @@ void main()
 	gl_TexCoord[0] = gl_MultiTexCoord0;
     gl_TexCoord[1] = gl_MultiTexCoord1;
     gl_Position = ftransform();
+    vertex_color = gl_Color;
     
     //normal = normalize(gl_NormalMatrix * gl_Normal);
     normal = normalize(gl_Normal);