This is effectively SDL_SetClipRect for SDL 1.3’s renderers.
I find myself desiring this type of functionality frequently, and since
I’m writing sdlgui it has become a bit more difficult to ignore.
Attached is a patch implementing this for Direct3D9, OpenGL,
OpenGLES(1/2), DirectFB, and Software renderers. I have no idea whether
or not NDS’s gl2D supports GL_SCISSOR_TEST/glSetScissor, so although I
have made the appropriate function (NDS_RenderSetScissor), the
implementation is commented out until someone who knows for certain gets
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