From 35fc43f862d6bb541639f334c519627cd7a451af Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Thu, 23 Oct 2025 13:30:39 -0500
Subject: [PATCH] initial

---
 .gitignore |  6 ++++++
 Makefile   | 37 ++++++++++++++++++++++++++++++++++
 gba-lib    |  1 +
 main.c     | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 palette.py |  7 +++++++
 5 files changed, 110 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 120000 gba-lib
 create mode 100644 main.c
 create mode 100644 palette.py

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..522c166
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+*.sav
+*.map
+*.o
+
+*.elf
+*.gba
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..43e2db1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,37 @@
+all: main.gba
+
+CFLAGS += -falign-functions=16
+
+LIB = $(PWD)/gba-lib
+
+include $(LIB)/common.mk
+
+AFLAGS += -I$(LIB)
+CFLAGS += -I$(LIB)
+
+OBJS = $(LIB)/header.o $(LIB)/load.o $(LIB)/copy.o
+OBJS += main.o
+OBJS += DSC09311_256.data.o
+OBJS += DSC09311_256.data.pal.o
+
+HEADERS = $(wildcard *.h)
+
+main.elf: $(OBJS) | $(LIB)/main.lds
+	$(call LINK_ELF,$(LIB)/main.lds)
+
+# external
+
+make-tools:
+	$(MAKE) -C tools
+
+%.glyph: %.otb | make-tools
+	./tools/otb-convert $< > $@
+
+%.glyph.o: %.glyph
+	$(BUILD_BINARY_O)
+
+%.data.o: %.data
+	$(BUILD_BINARY_IMAGE_O)
+
+%.data.pal.o: %.data.pal
+	$(BUILD_BINARY_IMAGE_O)
diff --git a/gba-lib b/gba-lib
new file mode 120000
index 0000000..2d8868e
--- /dev/null
+++ b/gba-lib
@@ -0,0 +1 @@
+../gba-lib
\ No newline at end of file
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..ad5e46e
--- /dev/null
+++ b/main.c
@@ -0,0 +1,59 @@
+extern unsigned int _binary_DSC09311_256_data_pal_start;
+extern unsigned int _binary_DSC09311_256_data_pal_end;
+extern unsigned int _binary_DSC09311_256_data_pal_size;
+
+extern unsigned int _binary_DSC09311_256_data_start;
+extern unsigned int _binary_DSC09311_256_data_end;
+extern unsigned int _binary_DSC09311_256_data_size;
+
+#include "io_reg.h"
+#include "vram.h"
+#include "register_values.h"
+#include "copy.h"
+#include "nib.h"
+#include "type.h"
+#include "oam.h"
+
+void _start(void)
+{
+  int height = 240;
+  int width = 160;
+
+  u8 * pal = (u8*)&_binary_DSC09311_256_data_pal_start;
+  u16 * _pram = (u16 *)&pram.bg[0][0];
+  for (int color = 0; color < 256; color++) {
+    int r = pal[color * 3 + 0] >> 3;
+    int g = pal[color * 3 + 1] >> 3;
+    int b = pal[color * 3 + 2] >> 3;
+    _pram[color] = PRAM_RGB15(r, g, b);
+  }
+
+  u32 _vram;
+
+  for (int y = 0; y < height; y++) {
+    for (int x = 0; x < width; x++) {
+      u8 index = ((u8 *)(&_binary_DSC09311_256_data_start))[y * width + x];
+
+      switch (x & 0x3) {
+      case 0: _vram = index; break;
+      case 1: _vram |= index << 8; break;
+      case 2: _vram |= index << 16; break;
+      case 3: _vram |= index << 24;
+        *((u32 *)(0x6000000 + (y * width + x))) = _vram;
+        break;
+      }
+    }
+  }
+
+  while ((io_reg.VCOUNT & 0xff) < 161);
+
+  io_reg.DISPCNT =
+    ( DISPCNT__BG2
+    | DISPCNT__BG_MODE_4
+    | DISPCNT__FRAMEBUFFER(0)
+    );
+
+  while (1) {
+    io_reg.HALTCNT = 0;
+  };
+}
diff --git a/palette.py b/palette.py
new file mode 100644
index 0000000..6727deb
--- /dev/null
+++ b/palette.py
@@ -0,0 +1,7 @@
+f = open("DSC09311-256.data.pal", 'rb')
+b = f.read()
+
+
+def grouper(iterable, n):
+    args = [iter(iterable)] * n
+    return zip(*args, strict=True)