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Perf: make SDL2 backend update less pixels, when updating internal textures and surface(s)

This commit is contained in:
David Ludwig 2017-09-12 17:31:05 -04:00
parent 50986dcf46
commit ef26204e6d
1 changed files with 54 additions and 45 deletions
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99
BasiliskII/src/SDL/video_sdl2.cpp
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@ -137,6 +137,8 @@ static SDL_Surface * guest_surface = NULL; // Surface in guest-OS display form
static SDL_Renderer * sdl_renderer = NULL; // Handle to SDL2 renderer
static SDL_threadID sdl_renderer_thread_id = 0; // Thread ID where the SDL_renderer was created, and SDL_renderer ops should run (for compatibility w/ d3d9)
static SDL_Texture * sdl_texture = NULL; // Handle to a GPU texture, with which to draw guest_surface to
static SDL_Rect sdl_update_video_rect = {0,0,0,0}; // Union of all rects to update, when updating sdl_texture
static SDL_mutex * sdl_update_video_mutex = NULL; // Mutex to protect sdl_update_video_rect
static int screen_depth; // Depth of current screen
static SDL_Cursor *sdl_cursor = NULL; // Copy of Mac cursor
static SDL_Palette *sdl_palette = NULL; // Color palette to be used as CLUT and gamma table
@ -168,7 +170,6 @@ static void (*video_refresh)(void);
// Prototypes
static int redraw_func(void *arg);
static int update_sdl_video();
static int present_sdl_video();
static int SDLCALL on_sdl_event_generated(void *userdata, SDL_Event * event);
static bool is_fullscreen(SDL_Window *);
@ -775,6 +776,10 @@ static SDL_Surface * init_sdl_video(int width, int height, int bpp, Uint32 flags
SDL_GetRendererInfo(sdl_renderer, &info);
printf("Using SDL_Renderer driver: %s\n", (info.name ? info.name : "(null)"));
}
if (!sdl_update_video_mutex) {
sdl_update_video_mutex = SDL_CreateMutex();
}
SDL_assert(sdl_texture == NULL);
sdl_texture = SDL_CreateTexture(sdl_renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, width, height);
@ -782,6 +787,7 @@ static SDL_Surface * init_sdl_video(int width, int height, int bpp, Uint32 flags
shutdown_sdl_video();
return NULL;
}
sdl_update_video_rect = {0,0,0,0};
SDL_assert(guest_surface == NULL);
SDL_assert(host_surface == NULL);
@ -861,62 +867,65 @@ static int present_sdl_video()
SDL_SetRenderDrawColor(sdl_renderer, 0, 0, 0, 0); // Use black
SDL_RenderClear(sdl_renderer); // Clear the display
if (host_surface != guest_surface &&
// We're about to work with sdl_update_video_rect, so stop other threads from
// modifying it!
SDL_LockMutex(sdl_update_video_mutex);
// Convert from the guest OS' pixel format, to the host OS' texture, if necessary.
if (host_surface != guest_surface &&
host_surface != NULL &&
guest_surface != NULL)
{
SDL_Rect destRect = {0, 0, host_surface->w, host_surface->h};
if (SDL_BlitSurface(guest_surface, NULL, host_surface, &destRect) != 0) {
SDL_Rect destRect = sdl_update_video_rect;
if (SDL_BlitSurface(guest_surface, &sdl_update_video_rect, host_surface, &destRect) != 0) {
SDL_UnlockMutex(sdl_update_video_mutex);
return -1;
}
}
if (SDL_UpdateTexture(sdl_texture, NULL, host_surface->pixels, host_surface->pitch) != 0) {
return -1;
}
SDL_Rect src_rect = {0, 0, host_surface->w, host_surface->h};
if (SDL_RenderCopy(sdl_renderer, sdl_texture, &src_rect, NULL) != 0) {
// Update the host OS' texture
void * srcPixels = (void *)((uint8_t *)host_surface->pixels +
sdl_update_video_rect.y * host_surface->pitch +
sdl_update_video_rect.x * host_surface->format->BytesPerPixel);
if (SDL_UpdateTexture(sdl_texture, &sdl_update_video_rect, srcPixels, host_surface->pitch) != 0) {
SDL_UnlockMutex(sdl_update_video_mutex);
return -1;
}
// We are done working with pixels in host_surface. Reset sdl_update_video_rect, then let
// other threads modify it, as-needed.
sdl_update_video_rect = {0,0,0,0};
SDL_UnlockMutex(sdl_update_video_mutex);
// Copy the texture to the display
if (SDL_RenderCopy(sdl_renderer, sdl_texture, NULL, NULL) != 0) {
return -1;
}
// Update the display
SDL_RenderPresent(sdl_renderer);
return 0;
}
static int update_sdl_video()
{
// HACK, dludwig@pobox.com: for now, just update the whole screen, via
// VideoInterrupt(), which gets called on the main thread.
//
// TODO: make sure SDL_Renderer resources get displayed, if and when
// MacsBug is running (and VideoInterrupt() might not get called)
//
// TODO: cache rects to update, then use rects in present_sdl_video()
return 0;
}
void update_sdl_video(SDL_Surface *s, Sint32 x, Sint32 y, Sint32 w, Sint32 h)
{
// HACK, dludwig@pobox.com: for now, just update the whole screen, via
// VideoInterrupt(), which gets called on the main thread.
//
// TODO: make sure SDL_Renderer resources get displayed, if and when
// MacsBug is running (and VideoInterrupt() might not get called)
//
// TODO: cache rects to update, then use rects in present_sdl_video()
// Indicate success to the caller!
return 0;
}
void update_sdl_video(SDL_Surface *s, int numrects, SDL_Rect *rects)
{
// HACK, dludwig@pobox.com: for now, just update the whole screen, via
// VideoInterrupt(), which gets called on the main thread.
//
// TODO: make sure SDL_Renderer resources get displayed, if and when
// MacsBug is running (and VideoInterrupt() might not get called)
//
// TODO: cache rects to update, then use rects in present_sdl_video()
// TODO: make sure SDL_Renderer resources get displayed, if and when
// MacsBug is running (and VideoInterrupt() might not get called)
SDL_LockMutex(sdl_update_video_mutex);
for (int i = 0; i < numrects; ++i) {
SDL_UnionRect(&sdl_update_video_rect, &rects[i], &sdl_update_video_rect);
}
SDL_UnlockMutex(sdl_update_video_mutex);
}
void update_sdl_video(SDL_Surface *s, Sint32 x, Sint32 y, Sint32 w, Sint32 h)
{
SDL_Rect temp = {x, y, w, h};
update_sdl_video(s, 1, &temp);
}
void driver_base::set_video_mode(int flags)
@ -2406,8 +2415,8 @@ static void update_display_static_bbox(driver_base *drv)
// Refresh display
if (nr_boxes)
update_sdl_video();
}
update_sdl_video(drv->s, nr_boxes, boxes);
}
// We suggest the compiler to inline the next two functions so that it