SDL_Vulkan_GetDrawableSize
Use this function to get the size of the window's underlying drawable dimensions in pixels. This is used for setting viewport sizes, scissor rectangles, and other places where the a VkExtent might show up in relation to the window.
Contents
Syntax
void SDL_Vulkan_GetDrawableSize(SDL_Window* window,
int* w,
int* h);
Function Parameters
window |
SDL_Window for which the size is to be queried |
w |
Pointer to the variable to write the width to or NULL |
h |
Pointer to the variable to write the height to or NULL |
Code Examples
// may instead choose to use std::clamp() in C++17
#define CLAMP(x, lo, hi) ((x) < (lo) ? (lo) : (x) > (hi) ? (hi) : (x))
SDL_Window *window;
VkSurfaceKHR surface;
VkPhysicalDevice physicalDevice;
// window = SDL_CreateWindow(...);
if (!SDL_Vulkan_CreateSurface(window, instance, &surface)) {
// handle error
}
// physicalDevice = ...;
// ...
// Create Swapchain
VkSurfaceCapabilitiesKHR capabilities;
vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physicalDevice, surface, &capabilities);
int width;
int height;
SDL_Vulkan_GetDrawableSize(window, &width, &height);
width = CLAMP(width, capabilities.minImageExtent.width, capabilities.maxImageExtent.width);
height = CLAMP(height, capabilities.minImageExtent.height, capabilities.maxImageExtent.height);
// ...
// vkCreateSwapchainKHR(...);
Remarks
This may differ from SDL_GetWindowSize if we're rendering to a high-DPI drawable, i.e. the window was created with SDL_WINDOW_ALLOW_HIGHDPI on a platform with high-DPI support (Apple calls this "Retina"), and not disabled by the SDL_HINT_VIDEO_HIGHDPI_DISABLED hint.
Version
This function is available in SDL 2.0.8
