1 files changed, 55 insertions, 0 deletions
diff --git a/src/demo.c b/src/demo.c
new file mode 100644
index 0000000..6248989
--- /dev/null
+++ b/src/demo.c
@@ -0,0 +1,55 @@
+#include <math.h>
+
+#include "demo.h"
+#include "ppu/ppu.h"
+
+#define HH_DEMO_BALL_COUNT 5
+hh_s_ppu_loc_fam_entry g_hh_demo_balls[HH_DEMO_BALL_COUNT];
+
+void hh_demo_setup() {
+	// load sprites
+	hh_ppu_update_sprite(0, HH_DBG_SPRITE_BALL);
+	hh_ppu_update_sprite(1, HH_DBG_SPRITE_CHECKERBOARD);
+
+	// background pattern
+	hh_ppu_update_color(0, 1, (hh_ppu_rgb_color_t) {0x8, 0x8, 0x8});
+	for (unsigned i = 0; i < HH_PPU_BG_CANVAS_TILES_H * HH_PPU_BG_CANVAS_TILES_V; i++) {
+		hh_ppu_update_background(i, (hh_s_ppu_loc_bam_entry) {
+			.horizontal_flip = false,
+			.vertical_flip = false,
+			.palette_index = 0,
+			.tilemap_index = 1,
+		});
+	}
+
+	// cool colors
+	hh_ppu_update_color(1, 1, (hh_ppu_rgb_color_t) {0xf, 0x0, 0xf});
+	hh_ppu_update_color(2, 1, (hh_ppu_rgb_color_t) {0xf, 0xf, 0xf});
+	hh_ppu_update_color(3, 1, (hh_ppu_rgb_color_t) {0xf, 0x0, 0x0});
+	hh_ppu_update_color(4, 1, (hh_ppu_rgb_color_t) {0x0, 0xf, 0xf});
+	hh_ppu_update_color(5, 1, (hh_ppu_rgb_color_t) {0x0, 0x0, 0xf});
+
+	// balls
+	for (unsigned i = 0; i < HH_DEMO_BALL_COUNT; i++) {
+		g_hh_demo_balls[i].horizontal_flip = false;
+		g_hh_demo_balls[i].vertical_flip = false;
+		g_hh_demo_balls[i].palette_index = i+1;
+		g_hh_demo_balls[i].tilemap_index = 0;
+	}
+}
+
+void hh_demo_loop(unsigned long frame) {
+	// set background pattern position
+	hh_ppu_update_aux((hh_s_ppu_loc_aux) {
+		.bg_shift_x = (frame / 2) % HH_PPU_SPRITE_WIDTH,
+		.bg_shift_y = (frame / 8) % HH_PPU_SPRITE_HEIGHT,
+		.fg_fetch = 0,
+		.sysreset = 0,
+	});
+
+	for (unsigned i = 0; i < HH_DEMO_BALL_COUNT; i++) {
+		g_hh_demo_balls[i].position_x = HH_PPU_SCREEN_WIDTH/2  - HH_PPU_SPRITE_WIDTH/2  + (int)(60 * (double)sin((1*(double)frame + 6*(double)i) / 30));
+		g_hh_demo_balls[i].position_y = HH_PPU_SCREEN_HEIGHT/2 - HH_PPU_SPRITE_HEIGHT/2 + (int)(30 * (double)sin((2*(double)frame + 6*(double)i) / 30));
+		hh_ppu_update_foreground(i, g_hh_demo_balls[i]);
+	}
+}