diff --git a/src/ncomplib.c b/src/ncomplib.c
index 741fbd1..a022bb4 100644
--- a/src/ncomplib.c
+++ b/src/ncomplib.c
@@ -3234,11 +3234,23 @@ void ncl_getScreenResolution(const ncl_ScreenState *state, size_t *width, size_t
 	*height = state->height;
 }
 
+void ncl_setScreenResolution(ncl_ScreenState *state, size_t width, size_t height) {
+	state->width = width;
+	state->height = height;
+	state->viewportWidth = width;
+	state->viewportHeight = height;
+}
+
 void ncl_getScreenViewport(const ncl_ScreenState *state, size_t *width, size_t *height) {
 	*width = state->viewportWidth;
 	*height = state->viewportHeight;
 }
 
+void ncl_setScreenViewport(ncl_ScreenState *state, size_t width, size_t height) {
+	state->viewportWidth = width;
+	state->viewportHeight = height;
+}
+
 ncl_Pixel ncl_getScreenPixel(const ncl_ScreenState *state, int x, int y) {
 	ncl_ScreenPixel p = ncl_getRealScreenPixel(state, x, y);
 	return (ncl_Pixel) {
diff --git a/src/ncomplib.h b/src/ncomplib.h
index 7291ed3..b71fe06 100644
--- a/src/ncomplib.h
+++ b/src/ncomplib.h
@@ -332,7 +332,9 @@ void ncl_lockScreen(ncl_ScreenState *state);
 void ncl_unlockScreen(ncl_ScreenState *state);
 void ncl_resetScreen(ncl_ScreenState *state);
 void ncl_getScreenResolution(const ncl_ScreenState *state, size_t *width, size_t *height);
+void ncl_setScreenResolution(ncl_ScreenState *state, size_t width, size_t height);
 void ncl_getScreenViewport(const ncl_ScreenState *state, size_t *width, size_t *height);
+void ncl_setScreenViewport(ncl_ScreenState *state, size_t width, size_t height);
 ncl_Pixel ncl_getScreenPixel(const ncl_ScreenState *state, int x, int y);
 void ncl_setScreenPixel(ncl_ScreenState *state, int x, int y, nn_codepoint codepoint, int fg, int bg, bool isFgPalette, bool isBgPalette);
 ncl_ScreenFlags ncl_getScreenFlags(const ncl_ScreenState *state);