OpenGL2: Use CPU vertex animation if too few vertex attributes

OpenGL ES has a minimum of 8 vertex attributes while desktop OpenGL has
a minimum of 16. Vertex animation uses attributes 10 to 12.

code/renderergl2/tr_mesh.c

@@ -282,9 +282,10 @@ R_AddMD3Surfaces
 */
 void R_AddMD3Surfaces( trRefEntity_t *ent ) {
 	int				i;
-	mdvModel_t		*model = NULL;
-	mdvSurface_t	*surface = NULL;
-	shader_t		*shader = NULL;
+	mdvModel_t		*model;
+	mdvSurface_t	*surface;
+	void			*drawSurf;
+	shader_t		*shader;
 	int				cull;
 	int				lod;
 	int				fogNum;
@@ -382,6 +383,12 @@ void R_AddMD3Surfaces( trRefEntity_t *ent ) {
 			shader = tr.shaders[ surface->shaderIndexes[ ent->e.skinNum % surface->numShaderIndexes ] ];
 		}
 
+		if ( model->numVaoSurfaces > 0 ) {
+			drawSurf = &model->vaoSurfaces[i];
+		} else {
+			drawSurf = surface;
+		}
+
 		// we will add shadows even if the main object isn't visible in the view
 
 		// stencil shadows can't do personal models unless I polyhedron clip
@@ -390,7 +397,7 @@ void R_AddMD3Surfaces( trRefEntity_t *ent ) {
 			&& fogNum == 0
 			&& !(ent->e.renderfx & ( RF_NOSHADOW | RF_DEPTHHACK ) ) 
 			&& shader->sort == SS_OPAQUE ) {
-			R_AddDrawSurf( (void *)&model->vaoSurfaces[i], tr.shadowShader, 0, qfalse, qfalse, 0 );
+			R_AddDrawSurf( drawSurf, tr.shadowShader, 0, qfalse, qfalse, 0 );
 		}
 
 		// projection shadows work fine with personal models
@@ -398,12 +405,12 @@ void R_AddMD3Surfaces( trRefEntity_t *ent ) {
 			&& fogNum == 0
 			&& (ent->e.renderfx & RF_SHADOW_PLANE )
 			&& shader->sort == SS_OPAQUE ) {
-			R_AddDrawSurf( (void *)&model->vaoSurfaces[i], tr.projectionShadowShader, 0, qfalse, qfalse, 0 );
+			R_AddDrawSurf( drawSurf, tr.projectionShadowShader, 0, qfalse, qfalse, 0 );
 		}
 
 		// don't add third_person objects if not viewing through a portal
 		if ( !personalModel ) {
-			R_AddDrawSurf((void *)&model->vaoSurfaces[i], shader, fogNum, qfalse, qfalse, cubemapIndex );
+			R_AddDrawSurf( drawSurf, shader, fogNum, qfalse, qfalse, cubemapIndex );
 		}
 
 		surface++;