#include <math.h>
#include <string.h>
#include <limits.h>
+#include <assert.h>
#include <conio.h>
#include "demo.h"
#include "keyb.h"
return 1;
}
- if(!(vmem_front = set_video_mode(fb_width, fb_height, fb_bpp))) {
+ if(!(vmem_back = set_video_mode(fb_width, fb_height, fb_bpp))) {
return 1;
}
- /* TODO implement multiple video memory pages for flipping */
- vmem_back = vmem_front;
+ if(!(vmem_front = page_flip(FLIP_NOW))) {
+ fprintf(stderr, "page flipping not supported. falling back to double buffering\n");
+ vmem_front = vmem_back;
+ } else {
+ assert(vmem_back != vmem_front);
+ }
if(demo_init(argc, argv) == -1) {
set_text_mode();
}
if(use_sball && sball_pending()) {
sball_event ev;
- printf("got sball event\n");
while(sball_getevent(&ev)) {
handle_sball_event(&ev);
}
void swap_buffers(void *pixels)
{
- /* TODO implement page flipping */
if(pixels) {
+ /* just memcpy to the front buffer */
if(opt.vsync) {
wait_vsync();
}
drawFps(pixels);
memcpy(vmem_front, pixels, fbsize);
+
} else {
- drawFps(vmem_back);
+ /* attempt page flipping */
+ void *next;
- if(opt.vsync) {
- wait_vsync();
+ drawFps(vmem_back);
+ if((next = page_flip(opt.vsync ? FLIP_VBLANK_WAIT : FLIP_NOW))) {
+ assert(next == vmem_back);
+ vmem_back = vmem_front;
+ vmem_front = next;
+ } else {
+ /* failed to page flip, assume we drew in the front buffer then
+ * and just wait for vsync if necessary
+ */
+ if(opt.vsync) {
+ wait_vsync();
+ }
}
}
}