how to organize rendering
- by Irbis
I use a deferred rendering. During g-buffer stage my rendering loop for a sponza model (obj format) looks like this:
int i = 0;
int sum = 0;
map<string, mtlItem *>::const_iterator itrEnd = mtl.getIteratorEnd();
for(map<string, mtlItem *>::const_iterator itr = mtl.getIteratorBegin(); itr != itrEnd; ++itr)
{
glActiveTexture(GL_TEXTURE0 + 0);
glBindTexture(GL_TEXTURE_2D, itr->second->map_KdId);
glDrawElements(GL_TRIANGLES, indicesCount[i], GL_UNSIGNED_INT, (GLvoid*)(sum * 4));
sum += indicesCount[i];
++i;
glBindTexture(GL_TEXTURE_2D, 0);
}
I sorted faces based on materials. I switch only a diffuse texture but I can place there more material properties. Is it a good approach ? I also wonder how to handle a different kind of materials, for example: some material use a normal map, other doesn't use. Should I have a different shaders for them ?
