Support significant parts of pico 8 graphics

game/BUILD

@@ -3,5 +3,5 @@ cc_library(
     srcs = glob(["*.c"]),
     hdrs = glob(["*.h"]),
     visibility = ["//visibility:public"],
-    deps = ["//device:device"]
+    deps = ["//device:device", "//sys:sys"]
 )

game/game.c

@@ -1,23 +1,36 @@
 #include "device/device.h"
 #include "game.h"
+#include "sys/sys.h"
 
 uint32_t game_frame;
 
+const char* game_title() {
+    return "Croc Party!";
+}
+
 void game_init() {
+    sys_init();
+
     game_frame = 0;
 
     for (uint32_t x = 0; x < 8; x++) {
         for (uint32_t y = 0; y < 8; y++) {
             for (uint32_t z = 0; z < 4; z++) {
-                device_palette[
-                    (x << 5)|(y << 2)|(z)
-                ] = 
+                sys_spal_set(
+                    (x << 5)|(y << 2)|(z),
+
                     ((x * 255)/7) << 24 | 
                     ((y * 255)/7) << 16 | 
-                    ((z * 255)/3) << 8;
+                    ((z * 255)/3) << 8
+                );
             }
         }
     }
+    sys_spal_set(0xfe, 0xffffffff);
+}
+
+void game_destroy() {
+    sys_destroy();
 }
 
 void game_update() {
@@ -25,6 +38,8 @@ void game_update() {
 }
 
 void game_draw() {
+    sys_dpal_set(0xff, 0xfe);  // map to a non-transparent color
+
     for (int x = 0; x < DEVICE_W; x++) {
         for (int y = 0; y < DEVICE_H; y++) {
             uint32_t r = (x * 255)/(DEVICE_W - 1);
@@ -35,12 +50,12 @@ void game_draw() {
                 g = 255 - g;
                 b = 255 - b;
             }
-            uint8_t color = (r >> 5) << 5 | (g >> 5) << 2 | (b >> 6);
-            device_pixels[y][x] = color;
+            sys_color color = (r >> 5) << 5 | (g >> 5) << 2 | (b >> 6);
+            sys_pixel_set(x, y, color);
         }
     }
 
     for (int i = 0; i < DEVICE_BUTTON_N; i++) {
-        device_pixels[0][i] = device_buttons[i] ? 0x00 : 0xff;
+        sys_pixel_set(i, 0, device_buttons[i] ? 0x00 : 0xff);
     }
 }

game/game.h

@@ -1,7 +1,10 @@
 #ifndef CROCPARTY_GAME_H
 #define CROCPARTY_GAME_H
 
+const char* game_title();
 void game_init();
+void game_destroy();
+
 void game_update();
 void game_draw();