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switch: handle aspect ratio correction in fullscreen mode

This commit is contained in:
Cpasjuste 2018-03-28 00:17:08 +02:00 committed by Dave Murphy
parent 53e19d42b9
commit 05b71ace4f
2 changed files with 38 additions and 28 deletions
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27
src/video/switch/SDL_switchvideo.c
View File

@ -37,6 +37,7 @@
typedef struct
{
SDL_Surface *surface;
int x_offset;
} SWITCH_WindowData;
static int SWITCH_VideoInit(_THIS);
@ -157,23 +158,31 @@ static int SWITCH_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *for
return -1;
}
// hold a pointer to our surface
// hold a pointer to our stuff
data = SDL_calloc(1, sizeof(SWITCH_WindowData));
data->surface = surface;
SDL_SetWindowData(window, SWITCH_DATA, data);
// use switch hardware scaling in fullscreen mode
if (window->flags & SDL_WINDOW_FULLSCREEN) {
gfxConfigureResolution(window->w, window->h);
float scaling = (float) window->h / (float) SCREEN_HEIGHT;
float w = SDL_min(SCREEN_WIDTH, SCREEN_WIDTH * scaling);
// calculate x offset, to respect aspect ratio
// round down to multiple of 4 for faster fb writes
int offset = (int) (w - (window->w)) / 2;
data->x_offset = offset & ~3;
gfxConfigureResolution((int) w, window->h);
}
else {
gfxConfigureResolution(0, 0);
data->x_offset = 0;
}
*format = SDL_PIXELFORMAT_ABGR8888;
*pixels = surface->pixels;
*pitch = surface->pitch;
SDL_SetWindowData(window, SWITCH_DATA, data);
// inform SDL we're ready to accept inputs
SDL_SetKeyboardFocus(window);
@ -189,25 +198,25 @@ static int SWITCH_UpdateWindowFramebuffer(_THIS, SDL_Window *window, const SDL_R
u32 *src = (u32 *) data->surface->pixels;
u32 *dst = (u32 *) gfxGetFramebuffer(&fb_w, &fb_h);
// prevent framebuffer overflow in case of resolution change outside SDL,
// which should not happen
if(window->x + w > fb_w) {
// prevent fb overflow in case of resolution change outside SDL
if (window->x + w > fb_w) {
w = fb_w - window->x;
}
if(window->y + h > fb_h) {
if (window->y + h > fb_h) {
h = fb_h - window->y;
}
for (y = 0; y < h; y++) {
for (x = 0; x < w; x += 4) {
*((u128 *) &dst[gfxGetFramebufferDisplayOffset((u32) (x + window->x), (u32) (y + window->y))]) =
*((u128 *) &dst[gfxGetFramebufferDisplayOffset(
(u32) (x + window->x + data->x_offset), (u32) (y + window->y))]) =
*((u128 *) &src[y * w + x]);
}
}
gfxFlushBuffers();
gfxSwapBuffers();
// TODO: handle SDL_RENDERER_PRESENTVSYNC (SW_RenderDriver not using flags)
// TODO: handle SDL_RENDERER_PRESENTVSYNC (SW_RenderDriver not accepting flags)
gfxWaitForVsync();
return 0;

7
test/testswitch.c
View File

@ -34,10 +34,11 @@ int main(int argc, char *argv[])
return -1;
}
// create a 800x600 centered window for demonstration.
// if SDL_WINDOW_FULLSCREEN flag is passed, the window will be hardware scaled to fit switch screen.
// create a 800x600 window for demonstration.
// if SDL_WINDOW_FULLSCREEN flag is passed, it will be hardware scaled (stretched) to fit screen,
// will always be centered and aspect ratio maintained.
// maximum window dimension is currently limited to 1280x720
window = SDL_CreateWindow(NULL, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, 0);
window = SDL_CreateWindow(NULL, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_FULLSCREEN);
if (!window) {
printf("SDL_CreateWindow: %s\n", SDL_GetError());
SDL_Quit();