From cbeff523d3c01471fcddfbf713b5d8d9e36dc1a9 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Tue, 30 May 2023 23:32:52 +0100
Subject: pngpal tool and first stab at embedding data on the EXE

WIP; the embedded data has an "environ" symbol that will cause issues
when we embed more than one piece of data.
---
 src/Makefile |  5 ++++-
 src/main.c   | 12 ++++++++++--
 src/vga.c    |  8 ++++++++
 src/vga.h    |  3 +++
 4 files changed, 25 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/Makefile b/src/Makefile
index 94b83eb..a53c697 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -4,7 +4,7 @@ CFLAGS	:= -I. -c -Wall -pedantic -O2 -march=i386
 LDFLAGS := -s
 
 SRCS	:= $(wildcard *.c)
-OBJS	:= $(SRCS:.c=.o)
+OBJS	:= $(SRCS:.c=.o) palette.o
 
 all: $(BIN)
 
@@ -14,6 +14,9 @@ $(BIN): $(OBJS)
 .c.o:
 	$(CC) $(CFLAGS) $< -o $@
 
+palette.o: ../data/sprites.png
+	../tools/pngpal.py $< $@
+
 clean:
 	rm -f $(BIN) *.o Makefile.deps
 
diff --git a/src/main.c b/src/main.c
index 5b315df..dd3cffa 100644
--- a/src/main.c
+++ b/src/main.c
@@ -7,11 +7,16 @@
 
 #include "vga.h"
 
+/* embedded data */
+extern const uint8_t binary_palette_start[];
+
 int main(int argc, char *argv[])
 {
     /* set VGA 320x200, 256 col */
     set_mode(0x13);
 
+    set_palette(binary_palette_start);
+
     uint8_t *screen = open_framebuffer();
     if (!screen)
     {
@@ -19,8 +24,11 @@ int main(int argc, char *argv[])
         return 1;
     }
 
-    for (int i = 0; i < 320 * 200 * 10; i++)
-        screen[rand() % (320 * 200)] = rand() % 255;
+    for (int i = 0; i < 16; i++)
+    {
+        memset(screen, i, 320 * 200);
+        getch();
+    }
 
     printf("Hello DOS!\n");
 
diff --git a/src/vga.c b/src/vga.c
index 5badd82..b3ee0a2 100644
--- a/src/vga.c
+++ b/src/vga.c
@@ -2,6 +2,7 @@
 #include <stdint.h>
 #include <dpmi.h>
 #include <sys/nearptr.h>
+#include <pc.h>
 
 uint8_t *open_framebuffer()
 {
@@ -22,3 +23,10 @@ void set_mode(uint8_t mode)
     regs.x.ax = mode;
     __dpmi_int(0x10, &regs);
 }
+
+void set_palette(const uint8_t *palette)
+{
+    outportb(0x3c8, 0);
+    for (int i = 0; i < 768; i++)
+        outportb(0x3c9, (palette[i] * 63) / 255);
+}
diff --git a/src/vga.h b/src/vga.h
index f35e6dd..a9c46c6 100644
--- a/src/vga.h
+++ b/src/vga.h
@@ -6,4 +6,7 @@ void close_framebuffer();
 
 void set_mode(uint8_t mode);
 
+/* the palette is expected to be 8 bit per color, and will be converted to VGA's 6 bit per color */
+void set_palette(const uint8_t *palette);
+
 #endif // _VGA_H
-- 
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