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More accurate update rects / show window / present sequence 

For the option when we use the SDL_Renderer we change:

- the order of calls to SDL_DestroyTexture/Renderer.
  Reported by valgrind on linux as an error to destroy the
  renderer before the texture.
- the SDL_Renderer and texture are created when the surface is
  initialized before the window is shown

It seems that creating the SDL_Renderer and Texture between the
moment the window was shown and the renderer present was introducing
a flashing blank window because of the time taken to create the
renderer/texture resources.
This commit is contained in:
Francesco Abbate 2021-05-05 23:20:30 +02:00
parent 5cef643e02
commit 4c99a18341
1 changed files with 14 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
src/renwindow.c
View File

@ -12,6 +12,18 @@ static int query_surface_scale(RenWindow *ren) {
assert(w_pixels % w_points == 0 && h_pixels % h_points == 0 && w_pixels / w_points == h_pixels / h_points);
return w_pixels / w_points;
}
static void setup_renderer(RenWindow *ren, int w, int h) {
/* Note that w and h here should always be in pixels and obtained from
a call to SDL_GL_GetDrawableSize(). */
if (ren->renderer) {
SDL_DestroyTexture(ren->texture);
SDL_DestroyRenderer(ren->renderer);
}
ren->renderer = SDL_CreateRenderer(ren->window, -1, 0);
ren->texture = SDL_CreateTexture(ren->renderer, SDL_PIXELFORMAT_BGRA32, SDL_TEXTUREACCESS_STREAMING, w, h);
ren->surface_scale = query_surface_scale(ren);
}
#endif
@ -23,7 +35,7 @@ void renwin_init_surface(RenWindow *ren) {
int w, h;
SDL_GL_GetDrawableSize(ren->window, &w, &h);
ren->surface = SDL_CreateRGBSurfaceWithFormat(0, w, h, 32, SDL_PIXELFORMAT_BGRA32);
ren->surface_scale = query_surface_scale(ren);
setup_renderer(ren, w, h);
#endif
}
@ -60,20 +72,6 @@ SDL_Surface *renwin_get_surface(RenWindow *ren) {
#endif
}
#ifdef LITE_USE_SDL_RENDERER
static void setup_renderer(RenWindow *ren, int w, int h) {
/* Note that w and h here should always be in pixels and obtained from
a call to SDL_GL_GetDrawableSize(). */
if (ren->renderer) {
SDL_DestroyRenderer(ren->renderer);
SDL_DestroyTexture(ren->texture);
}
ren->renderer = SDL_CreateRenderer(ren->window, -1, 0);
ren->texture = SDL_CreateTexture(ren->renderer, SDL_PIXELFORMAT_BGRA32, SDL_TEXTUREACCESS_STREAMING, w, h);
ren->surface_scale = query_surface_scale(ren);
}
#endif
void renwin_resize_surface(RenWindow *ren) {
#ifdef LITE_USE_SDL_RENDERER
int new_w, new_h;
@ -89,11 +87,6 @@ void renwin_resize_surface(RenWindow *ren) {
void renwin_show_window(RenWindow *ren) {
SDL_ShowWindow(ren->window);
#ifdef LITE_USE_SDL_RENDERER
int w, h;
SDL_GL_GetDrawableSize(ren->window, &w, &h);
setup_renderer(ren, w, h);
#endif
}
void renwin_update_rects(RenWindow *ren, RenRect *rects, int count) {
@ -118,8 +111,8 @@ void renwin_free(RenWindow *ren) {
SDL_DestroyWindow(ren->window);
ren->window = NULL;
#ifdef LITE_USE_SDL_RENDERER
SDL_DestroyRenderer(ren->renderer);
SDL_DestroyTexture(ren->texture);
SDL_DestroyRenderer(ren->renderer);
SDL_FreeSurface(ren->surface);
#endif
}