[Sofa.GL] Implement missing overload (#5522)

Co-authored-by: Hugo <hugo.talbot@sofa-framework.org>

Author: alxbilger

Sofa/GL/src/sofa/gl/DrawToolGL.cpp

@@ -351,17 +351,24 @@ void DrawToolGL::drawTriangles(const std::vector<Vec3> &points, const std::vecto
 void DrawToolGL::drawTriangles(const std::vector<Vec3> &points,
     const std::vector< type::Vec3i > &index,
     const std::vector<Vec3> &normal,
-    const std::vector<type::RGBAColor>& colour)
+    const std::vector<type::RGBAColor>& colors)
 {
-    //todo !
-    SOFA_UNUSED(points);
-    SOFA_UNUSED(index);
-    SOFA_UNUSED(normal);
-    SOFA_UNUSED(colour);
+    glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
+    glEnable(GL_COLOR_MATERIAL);
+    setMaterial(colors[0]);
+    glBegin(GL_TRIANGLES);
+    {
+        for (std::size_t i=0; i<index.size(); ++i)
+        {
+            internalDrawTriangle(points[ index[i][0] ],points[ index[i][1] ],points[ index[i][2] ],
+                normal[i],
+                colors[3*i+0],colors[3*i+1],colors[3*i+2]);
+        }
+    } glEnd();
+    glDisable(GL_COLOR_MATERIAL);
+    resetMaterial(colors[0]);
 }
 
-/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-
 void DrawToolGL::drawTriangles(const std::vector<Vec3> &points,
         const std::vector<Vec3> &normal, const std::vector< type::RGBAColor > &color)
 {

Sofa/GL/src/sofa/gl/DrawToolGL.h

@@ -81,7 +81,7 @@ class SOFA_GL_API DrawToolGL : public helper::visual::DrawTool
     virtual void drawTriangles(const std::vector<type::Vec3> &points,
             const std::vector< type::Vec3i > &index,
             const std::vector<type::Vec3>  &normal,
-            const std::vector<type::RGBAColor>& color) override;
+            const std::vector<type::RGBAColor>& colors) override;
     virtual void drawTriangles(const std::vector<type::Vec3> &points,
             const std::vector<type::Vec3>  &normal,
             const std::vector< type::RGBAColor > &color) override;