Make color optional

src/duskgl/display/mesh/meshgl.c

@@ -26,8 +26,11 @@ errorret_t meshInitGL(
 
   #ifdef DUSK_OPENGL_LEGACY
     // Nothing needed.
-    glEnableClientState(GL_COLOR_ARRAY);
-    errorChain(errorGLCheck());
+    #if MESH_ENABLE_COLOR
+      glEnableClientState(GL_COLOR_ARRAY);
+      errorChain(errorGLCheck());
+    #endif
+    
     glEnableClientState(GL_TEXTURE_COORD_ARRAY);
     errorChain(errorGLCheck());
     glEnableClientState(GL_VERTEX_ARRAY);
@@ -79,17 +82,19 @@ errorret_t meshInitGL(
     glEnableVertexAttribArray(1);
     errorChain(errorGLCheck());
 
-    glVertexAttribPointer(
-      2,
-      sizeof(color_t) / sizeof(GLubyte),
-      GL_UNSIGNED_BYTE,
-      GL_TRUE,
-      sizeof(meshvertex_t),
-      (const GLvoid*)offsetof(meshvertex_t, color)
-    );
-    errorChain(errorGLCheck());
-    glEnableVertexAttribArray(2);
-    errorChain(errorGLCheck());
+    #if MESH_ENABLE_COLOR
+      glVertexAttribPointer(
+        2,
+        sizeof(color_t) / sizeof(GLubyte),
+        GL_UNSIGNED_BYTE,
+        GL_TRUE,
+        sizeof(meshvertex_t),
+        (const GLvoid*)offsetof(meshvertex_t, color)
+      );
+      errorChain(errorGLCheck());
+      glEnableVertexAttribArray(2);
+      errorChain(errorGLCheck());
+    #endif
 
     // Unbind VAO and VBO to prevent accidental modification
     glBindBuffer(GL_ARRAY_BUFFER, 0);
@@ -133,18 +138,22 @@ errorret_t meshDrawGL(
     // Legacy pointer style rendering
     const GLsizei stride = sizeof(meshvertex_t);
 
-    glColorPointer(
-      sizeof(color4b_t),
-      GL_UNSIGNED_BYTE,
-      stride,
-      (const GLvoid*)&mesh->vertices[offset].color
-    );
+    #if MESH_ENABLE_COLOR
+      glColorPointer(
+        sizeof(color4b_t),
+        GL_UNSIGNED_BYTE,
+        stride,
+        (const GLvoid*)&mesh->vertices[offset].color
+      );
+    #endif
+
     glTexCoordPointer(
       MESH_VERTEX_UV_SIZE,
       GL_FLOAT,
       stride,
       (const GLvoid*)&mesh->vertices[offset].uv[0]
     );
+    
     glVertexPointer(
       MESH_VERTEX_POS_SIZE,
       GL_FLOAT,