diff options
Diffstat (limited to 'render_sdl.c')
| -rw-r--r-- | render_sdl.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/render_sdl.c b/render_sdl.c index d3e7ef9..49e545d 100644 --- a/render_sdl.c +++ b/render_sdl.c @@ -6,6 +6,8 @@ SDL_Surface *screen; uint8_t render_dbg = 0; +uint32_t last_frame = 0; + void render_init(int width, int height) { if (SDL_Init(SDL_INIT_VIDEO) < 0) { @@ -31,6 +33,7 @@ void render_context(vdp_context * context) uint16_t *buf_16; uint32_t *buf_32; uint8_t b,g,r; + last_frame = SDL_GetTicks(); if (SDL_MUSTLOCK(screen)) { if (SDL_LockSurface(screen) < 0) { return; @@ -43,7 +46,6 @@ void render_context(vdp_context * context) } else { repeat_y = repeat_x; } - printf("w: %d, h: %d, repeat_x: %d, repeat_y: %d\n", screen->clip_rect.w, screen->clip_rect.h, repeat_x, repeat_y); switch (screen->format->BytesPerPixel) { case 2: buf_16 = (uint16_t *)screen->pixels; @@ -151,3 +153,38 @@ void render_wait_quit(vdp_context * context) } } +#define FRAME_DELAY 16 +#define MIN_DELAY 10 + +void wait_render_frame(vdp_context * context) +{ + SDL_Event event; + while(SDL_PollEvent(&event)) { + switch (event.type) { + case SDL_KEYDOWN: + //TODO: Update emulated gamepads + if (event.key.keysym.sym == SDLK_LEFTBRACKET) { + render_dbg = !render_dbg; + render_context(context); + } + break; + case SDL_QUIT: + exit(0); + } + } + //TODO: Adjust frame delay so we actually get 60 FPS rather than 62.5 FPS + uint32_t current = SDL_GetTicks(); + uint32_t desired = last_frame + FRAME_DELAY; + if (current < desired) { + uint32_t delay = last_frame + FRAME_DELAY - current; + //TODO: Calculate MIN_DELAY at runtime + if (delay > MIN_DELAY) { + SDL_Delay((delay/MIN_DELAY)*MIN_DELAY); + } + while ((desired) < SDL_GetTicks()) { + } + } + render_context(context); +} + + |