From: John Tsiombikas <nuclear@member.fsf.org>
Date: Mon, 18 Nov 2019 15:43:53 +0000 (+0200)
Subject: adding the previous gfx.h file, will re-write the code
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=commitdiff_plain;h=acf706a52fdef3bea3f4ae07b7797395f854c11e

adding the previous gfx.h file, will re-write the code
---

diff --git a/src/dos/gfx.h b/src/dos/gfx.h
new file mode 100644
index 0000000..109bbcf
--- /dev/null
+++ b/src/dos/gfx.h
@@ -0,0 +1,60 @@
+#ifndef GFX_H_
+#define GFX_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void *set_video_mode(int xsz, int ysz, int bpp);
+int set_text_mode(void);
+
+int get_color_depth(void);
+int get_color_bits(int *rbits, int *gbits, int *bbits);
+int get_color_shift(int *rshift, int *gshift, int *bshift);
+int get_color_mask(unsigned int *rmask, unsigned int *gmask, unsigned int *bmask);
+
+void set_palette(int idx, int r, int g, int b);
+
+enum {
+	FLIP_NOW,
+	FLIP_VBLANK,
+	FLIP_VBLANK_WAIT
+};
+/* page flip and return pointer to the start of the display area (front buffer) */
+void *page_flip(int vsync);
+
+#ifdef __WATCOMC__
+void wait_vsync(void);
+#pragma aux wait_vsync = \
+	"mov dx, 0x3da" \
+	"l1:" \
+	"in al, dx" \
+	"and al, 0x8" \
+	"jnz l1" \
+	"l2:" \
+	"in al, dx" \
+	"and al, 0x8" \
+	"jz l2" \
+	modify[al dx];
+#endif
+
+#ifdef __DJGPP__
+#define wait_vsync()  asm volatile ( \
+	"mov $0x3da, %%dx\n\t" \
+	"0:\n\t" \
+	"in %%dx, %%al\n\t" \
+	"and $8, %%al\n\t" \
+	"jnz 0b\n\t" \
+	"0:\n\t" \
+	"in %%dx, %%al\n\t" \
+	"and $8, %%al\n\t" \
+	"jz 0b\n\t" \
+	:::"%eax","%edx")
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* GFX_H_ */