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Add helper functions to perform NDC transformations

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This commit is contained in:
Cameron Gutman 2022-04-05 00:50:04 -05:00
commit 940ae6406b
3 changed files with 35 additions and 13 deletions
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16
app/streaming/streamutils.cpp
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@ -32,6 +32,22 @@ void StreamUtils::scaleSourceToDestinationSurface(SDL_Rect* src, SDL_Rect* dst)
}
}
void StreamUtils::screenSpaceToNormalizedDeviceCoords(SDL_FRect* rect, int viewportWidth, int viewportHeight)
{
rect->x = (rect->x / (viewportWidth / 2.0f)) - 1.0f;
rect->y = (rect->y / (viewportHeight / 2.0f)) - 1.0f;
rect->w = rect->w / (viewportWidth / 2.0f);
rect->h = rect->h / (viewportHeight / 2.0f);
}
void StreamUtils::screenSpaceToNormalizedDeviceCoords(SDL_Rect* src, SDL_FRect* dst, int viewportWidth, int viewportHeight)
{
dst->x = ((float)src->x / (viewportWidth / 2.0f)) - 1.0f;
dst->y = ((float)src->y / (viewportHeight / 2.0f)) - 1.0f;
dst->w = (float)src->w / (viewportWidth / 2.0f);
dst->h = (float)src->h / (viewportHeight / 2.0f);
}
int StreamUtils::getDisplayRefreshRate(SDL_Window* window)
{
int displayIndex = SDL_GetWindowDisplayIndex(window);