added two new global pointers in demo.h: vmem_back and vmem_front, and

[dosdemo] / src / demo.h

diff --git a/src/demo.h b/src/demo.h
index 530e3de..1b246ed 100644 (file)
--- a/src/demo.h
+++ b/src/demo.h
@@ -1,8 +1,14 @@
 #ifndef DEMO_H_
 #define DEMO_H_
 
+#include "inttypes.h"
+
 extern int fb_width, fb_height, fb_bpp;
-extern void *fb_pixels;
+extern uint16_t *fb_pixels;    /* system-RAM pixel buffer: use swap_buffers(fb_pixels) */
+/* video memory pointers. might both point to the front buffer if there is not
+ * enough memory for page flipping. use swap_buffers(0) to flip. */
+extern uint16_t *vmem_back, *vmem_front;
+
 extern unsigned long time_msec;
 extern int mouse_x, mouse_y;
 extern unsigned int mouse_bmask;
@@ -14,9 +20,16 @@ void demo_draw(void);
 
 void demo_keyboard(int key, int state);
 
+
 /* defined in main_*.c */
 void demo_quit(void);
 unsigned long get_msec(void);
 void set_palette(int idx, int r, int g, int b);
 
+/* pass 0 to just swap vmem_back/vmem_front with page flipping
+ * pass a pointer to a system-ram pixel buffer to copy it to vmem_front,
+ * instead of flipping.
+ */
+void swap_buffers(void *pixels);
+
 #endif /* DEMO_H_ */