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3DS - Only call C2D_SceneBegin when we have to

Looking at Citro2D's source, it has a bunch of overhead

--- a/src/Backends/Rendering/3DS.cpp

+++ b/src/Backends/Rendering/3DS.cpp

@@ -73,6 +73,18 @@

 	}

 }

+static void SelectRenderTarget(C3D_RenderTarget *render_target)

+{

+	static C3D_RenderTarget *previous_render_target = NULL;

+

+	if (render_target != previous_render_target)

+	{

+		previous_render_target = render_target;

+

+		C2D_SceneBegin(render_target);

+	}

+}

+

 RenderBackend_Surface* RenderBackend_Init(const char *window_title, size_t screen_width, size_t screen_height, bool fullscreen)

 {

 	C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);

@@ -154,7 +166,7 @@

 	C2D_TargetClear(screen_render_target, 0xFF000000);

-	C2D_SceneBegin(screen_render_target);

+	SelectRenderTarget(screen_render_target);

 	C2D_DrawImageAt(image, (400 - framebuffer_surface->width) / 2, (240 - framebuffer_surface->height) / 2, 0.5f, NULL, 1.0f, 1.0f);

@@ -322,7 +334,7 @@

 	image.tex = &source_surface->texture;

 	image.subtex = &subtexture;

-	C2D_SceneBegin(destination_surface->render_target);

+	SelectRenderTarget(destination_surface->render_target);

 	C2D_DrawImageAt(image, x, y, 0.5f, NULL, 1.0f, 1.0f);

 }

@@ -337,7 +349,7 @@

 		frame_started = true;

 	}

-	C2D_SceneBegin(surface->render_target);

+	SelectRenderTarget(surface->render_target);

 	C2D_DrawRectSolid(rect->left, rect->top, 0.5f, rect->right - rect->left, rect->bottom - rect->top, C2D_Color32(red, green, blue, red == 0 && green == 0 && blue == 0 ? 0 : 0xFF));

 }

@@ -425,7 +437,7 @@

 		frame_started = true;

 	}

-	C2D_SceneBegin(destination_surface->render_target);

+	SelectRenderTarget(destination_surface->render_target);

 	glyph_atlas = atlas;