draw a square with color.

source/CMakeLists.txt

@@ -5,7 +5,7 @@ add_custom_command(
 	COMMENT "Creating game.c from game.js"
 )
 
-add_executable(WiiDuktape main.c game.c)
+add_executable(WiiDuktape main.c grrlib_duk.c game.c)
 target_link_libraries(WiiDuktape duktape)
 target_link_libraries(WiiDuktape GRRLIB)
 ogc_create_dol(WiiDuktape)

source/game.js

@@ -1,5 +1,33 @@
+function rgba(r, g, b, a) {
+	const buffer = Uint8Array.allocPlain(4);
+	buffer[0] = r;
+	buffer[1] = g;
+	buffer[2] = b;
+	buffer[3] = a;
+	return buffer;
+}
+
 const PAD_BUTTON_START = 0x1000;
 const PAD_BUTTON_A = 0x0100;
+const RED_COLOR = rgba(255, 0, 0, 255);
+const GREEN_COLOR = rgba(0, 255, 0, 255);
+
+function rgba_compare(rgba1, rgba2) {
+	return (rgba1[0] == rgba2[0]) &&
+		(rgba1[1] == rgba2[1]) &&
+		(rgba1[2] == rgba2[2]) &&
+		(rgba1[3] == rgba2[3]);
+}
+
+globalThis.rectangle_color = RED_COLOR;
+
+function swap_colors() {
+	if (rgba_compare(rectangle_color, RED_COLOR)) {
+		rectangle_color = GREEN_COLOR;
+	} else if (rgba_compare(rectangle_color, GREEN_COLOR)) {
+		rectangle_color = RED_COLOR;
+	}
+}
 
 function start() {
 }
@@ -14,7 +42,9 @@ function update() {
 
 	if (pressed & PAD_BUTTON_A) {
 		wii.print("a pressed");
+		swap_colors();
 	}
 
-	wii.grrlib.fill_screen();
+	wii.grrlib.fill_screen(rgba(255, 255, 255, 255));
+	wii.grrlib.rectangle(0, 0, 320, 240, rectangle_color, true);
 }

source/grrlib_duk.c

@@ -0,0 +1,40 @@
+#include "grrlib_duk.h"
+#include <grrlib.h>
+
+static unsigned int get_color(duk_context *ctx, duk_idx_t index) {
+	size_t rgba_size;
+	unsigned char * rgba = duk_get_buffer(ctx, index, &rgba_size);
+	return rgba[0] << 24 | rgba[1] << 16 | rgba[2] << 8 | rgba[3];
+}
+
+static duk_ret_t grrlib_fill_screen(duk_context *ctx) {
+	unsigned int color = get_color(ctx, 0);
+
+	GRRLIB_FillScreen(color);
+	return 0;
+}
+
+static duk_ret_t grrlib_rectangle(duk_context *ctx) {
+	float x = duk_to_number(ctx, 0);
+
+	float y = duk_to_number(ctx, 1);
+	float width = duk_to_number(ctx, 2);
+	float height = duk_to_number(ctx, 3);
+
+	unsigned int color = get_color(ctx, 4);
+
+	bool filled = duk_to_boolean(ctx, 5);
+	
+	GRRLIB_Rectangle(x, y, width, height, color, filled);
+	return 0;
+}
+
+void define_grrlib_object(duk_context *ctx) {
+	duk_idx_t grrlib_obj = duk_push_object(ctx);
+
+	duk_push_c_function(ctx, grrlib_fill_screen, 1);
+	duk_put_prop_string(ctx, grrlib_obj, "fill_screen");
+
+	duk_push_c_function(ctx, grrlib_rectangle, 6);
+	duk_put_prop_string(ctx, grrlib_obj, "rectangle");
+}

source/grrlib_duk.h

@@ -0,0 +1,5 @@
+#ifndef GRRLIB_DUK_H
+#define GRRLIB_DUK_H
+#include <duktape.h>
+void define_grrlib_object(duk_context *ctx);
+#endif

source/main.c

@@ -1,5 +1,6 @@
 #include <grrlib.h>
 #include <duktape.h>
+#include "grrlib_duk.h"
 
 extern const char* program;
 static bool running = true;
@@ -18,11 +19,6 @@ static void duk_fatal_error(void *udata, const char *msg) {
 	GRRLIB_GeckoPrintf("an error has occured: %s\n", msg);
 }
 
-static duk_ret_t grrlib_fill_screen(duk_context *ctx) {
-	GRRLIB_FillScreen(0xFFFFFFFF);
-	return 0;
-}
-
 static duk_ret_t pad_scan_pads() {
 	PAD_ScanPads();
 	return 0;
@@ -44,13 +40,6 @@ static void define_pad_object(duk_context *ctx) {
 	duk_put_prop_string(ctx, pad_obj, "buttons_down");
 }
 
-static void define_grrlib_object(duk_context *ctx) {
-	duk_idx_t grrlib_obj = duk_push_object(ctx);
-
-	duk_push_c_function(ctx, grrlib_fill_screen, 0);
-	duk_put_prop_string(ctx, grrlib_obj, "fill_screen");
-}
-
 static void define_wii_object(duk_context *ctx) {
 	duk_idx_t wii_obj = duk_push_object(ctx);