pulled in and adapted the dos code from eradicate

[retrobench] / src / dos / gfx.h

diff --git a/src/dos/gfx.h b/src/dos/gfx.h
new file mode 100644 (file)
index 0000000..2f33db4
--- /dev/null
+++ b/src/dos/gfx.h
@@ -0,0 +1,81 @@
+#ifndef GFX_H_
+#define GFX_H_
+
+#include "util.h"
+
+struct video_mode {
+       uint16_t mode;
+       short xsz, ysz, bpp, pitch;
+       short rbits, gbits, bbits;
+       short rshift, gshift, bshift;
+       uint32_t rmask, gmask, bmask;
+       uint32_t fb_addr;
+       short max_pages;
+       uint32_t bank_size;
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int init_video(void);
+void cleanup_video(void);
+
+struct video_mode *video_modes(void);
+int num_video_modes(void);
+
+#define VMODE_CURRENT  (-1)
+struct video_mode *get_video_mode(int idx);
+
+int match_video_mode(int xsz, int ysz, int bpp);
+int find_video_mode(int mode);
+
+/* argument is the mode list index [0, nmodes-1] */
+void *set_video_mode(int idx, int nbuf);
+int set_text_mode(void);
+
+void set_palette(int idx, int r, int g, int b);
+
+enum {
+       FLIP_NOW,
+       FLIP_VBLANK
+};
+/* page flip and return pointer to the start of the display area (front buffer) */
+void *page_flip(int vsync);
+extern void (*blit_frame)(void *pixels, 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_ */