+#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_ */