From 5a3198e108fc868da57a002abaca9a4db28d096b Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Sat, 15 Feb 2020 09:41:35 +0000
Subject: initial rom with basic gradient.

---
 dat.h  | 17 +++++++++++++++++
 main.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 regs.h |  9 +++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 dat.h
 create mode 100644 main.c
 create mode 100644 regs.h

diff --git a/dat.h b/dat.h
new file mode 100644
index 0000000..c852a09
--- /dev/null
+++ b/dat.h
@@ -0,0 +1,17 @@
+enum {
+	SCRW = 240,
+	SCRH = 160
+};
+
+typedef unsigned char uchar;
+typedef unsigned short ushort;
+typedef unsigned int uint;
+typedef unsigned long ulong;
+typedef unsigned long long uvlong;
+
+typedef struct Point Point;
+
+struct Point
+{
+	int x, y;
+};
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..caa0e59
--- /dev/null
+++ b/main.c
@@ -0,0 +1,43 @@
+#include "dat.h"
+#include "regs.h"
+
+uint *ioram = (uint*)IORAM;
+ushort *vram = (ushort*)VRAM;
+
+Point
+Pt(int x, int y)
+{
+	return (Point){x,y};
+}
+
+ushort
+rgb(int r, int g, int b)
+{
+	ushort c;
+
+	c = 0;
+	c |= (r&0x1f)<<10;
+	c |= (g&0x1f)<<5;
+	c |= b&0x1f;
+	return c;
+}
+
+void
+drawpixel(Point p, ushort col)
+{
+	vram[p.x+p.y*SCRW] = col;
+}
+
+int
+main()
+{
+	int i, c;
+
+	*ioram = 0x0403;
+	for(i = 0; i < SCRH; i++){
+		c = 31*i/SCRH;
+		drawpixel(Pt(i,i), rgb(c,c,c));
+	}
+	for(;;);
+	return 0;
+}
diff --git a/regs.h b/regs.h
new file mode 100644
index 0000000..2c93048
--- /dev/null
+++ b/regs.h
@@ -0,0 +1,9 @@
+#define SYSROM	0x00000000UL
+#define EWRAM	0x02000000UL
+#define IWRAM	0x03000000UL
+#define IORAM	0x04000000UL
+#define PALRAM	0x05000000UL
+#define VRAM	0x06000000UL
+#define OAM	0x07000000UL
+#define PAKROM	0x08000000UL
+#define CART	0x0E000000UL
-- 
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