From 722d5509178fa5bdaa488fbbd9196f21377f8775 Mon Sep 17 00:00:00 2001
From: Ben Bridle <ben@derelict.engineering>
Date: Mon, 18 Nov 2024 14:57:19 +1300
Subject: Initial commit

---
 arm9/source/main.c | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 arm9/source/main.c

(limited to 'arm9/source/main.c')

diff --git a/arm9/source/main.c b/arm9/source/main.c
new file mode 100644
index 0000000..a8d3273
--- /dev/null
+++ b/arm9/source/main.c
@@ -0,0 +1,118 @@
+#include <stdio.h>
+#include <time.h>
+#include <nds.h>
+#include "devices/clock.h"
+#include "devices/math.h"
+#include "devices/screen.h"
+#include "bang.h"
+#include "core.h"
+#include "main_debug.h"
+
+Bedrock br[5] = {};
+Bedrock *br_main;
+Bedrock *br_sub;
+bool main_on_bottom = TRUE;
+
+u8 main_program[] = {
+    #include "../include/sysinfo.br.inc"
+};
+u8 keyboard_program[] = {
+    #include "../include/sysinfo.br.inc"
+};
+
+// Change to the next screen layout.
+void change_layout(void) {
+    lcdSwap();
+    main_on_bottom = !main_on_bottom;
+}
+
+// Scan for input and handle emulator-specific keys.
+void receive_input(void) {
+    scanKeys();
+    if (keysDown() & KEY_SELECT) change_layout();
+}
+
+
+void run_br(Bedrock *br) {
+    if (br->awake) {
+        switch (evaluate(br, 1000)) {
+        case SIG_HALT:   br->alive = FALSE; black_screen(br->scr.nds); br = NULL; return;
+        case SIG_SLEEP:  br->awake = FALSE;            return;
+        case SIG_DB1:     debug_stacks(br);            return;
+        case SIG_DB4:     debug_assert(br);            return;
+        default:                                       return;
+        }
+    }
+}
+
+Screen scr_main = {
+    .bgv = BG_TILE_RAM(BG_SLOT_VIS),
+    .fgv = BG_TILE_RAM(FG_SLOT_VIS),
+    .bg  = BG_TILE_RAM(BG_SLOT),
+    .fg  = BG_TILE_RAM(FG_SLOT),
+    .map = BG_MAP_RAM(MAP_SLOT),
+    .pal = BG_PALETTE,
+};
+Screen scr_sub = {
+    .bgv = BG_TILE_RAM_SUB(BG_SLOT_VIS),
+    .fgv = BG_TILE_RAM_SUB(FG_SLOT_VIS),
+    .bg  = BG_TILE_RAM_SUB(BG_SLOT),
+    .fg  = BG_TILE_RAM_SUB(FG_SLOT),
+    .map = BG_MAP_RAM_SUB(MAP_SLOT),
+    .pal = BG_PALETTE_SUB,
+};
+
+int main(void) {
+    #define ALIVE(br)  (br && br->alive)
+    #define AWAKE(br)  (br && br->alive &&  br->awake)
+    #define ASLEEP(br) (br && br->alive && !br->awake)
+
+    init_screens();
+    init_clock();
+    lcdMainOnBottom();
+
+    // TODO: Remove
+    // consoleDemoInit();
+
+    // Load program
+    start_br(&br[0], main_program, sizeof(main_program));
+    start_br(&br[1], keyboard_program, sizeof(keyboard_program));
+    br_main = &br[0];
+    br_sub = &br[1];
+    br_main->scr.nds = &scr_main;
+    br_sub->scr.nds = &scr_sub;
+
+    while (1) {
+        if (AWAKE(br_main)) run_br(br_main);
+        if (AWAKE(br_sub))  run_br(br_sub);
+
+        bool main_flip = ASLEEP(br_main) && br_main->scr.dirty;
+        bool sub_flip = ASLEEP(br_sub) && br_sub->scr.dirty;
+        if (main_flip || sub_flip) swiWaitForVBlank();
+        if (main_flip) { flip_buffer(br_main->scr.nds); br_main->scr.dirty = false; }
+        if (sub_flip) { flip_buffer(br_sub->scr.nds); br_sub->scr.dirty = false; }
+
+        rouse:
+        receive_input();
+        if (ALIVE(br_main)) {
+            inp_read_navigation(&br_main->inp);
+            inp_read_gamepad(&br_main->inp);
+            if (main_on_bottom)  inp_read_touch(&br_main->inp);
+        }
+        if (ALIVE(br_sub)) {
+            inp_read_navigation(&br_sub->inp);
+            inp_read_gamepad(&br_sub->inp);
+            if (!main_on_bottom) inp_read_touch(&br_sub->inp);
+        }
+        if (ASLEEP(br_main)) rouse_br(br_main);
+        if (ASLEEP(br_sub))  rouse_br(br_sub);
+        if (ASLEEP(br_main) && ASLEEP(br_sub)) {
+            // Sleep until next keypad event or clock tick.
+            swiIntrWait(1, IRQ_KEYS | IRQ_TIMER0);
+            goto rouse;
+        }
+
+        if (!br_main && !br_sub) return 0;
+    }
+}
+
-- 
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