Added SDL_HINT_OPENGL_LIBRARY and SDL_HINT_VULKAN_LIBRARY

src/video/android/SDL_androidvulkan.c

@@ -49,7 +49,7 @@ int Android_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan loader library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
     if (!path) {
         path = "libvulkan.so";

src/video/cocoa/SDL_cocoaopengl.m

@@ -229,7 +229,7 @@ int Cocoa_GL_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 {
     /* Load the OpenGL library */
     if (path == NULL) {
-        path = SDL_getenv("SDL_OPENGL_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_OPENGL_LIBRARY);
     }
     if (path == NULL) {
         path = DEFAULT_OPENGL;

src/video/cocoa/SDL_cocoavulkan.m

@@ -61,7 +61,7 @@ int Cocoa_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan loader library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
 
     if (!path) {

src/video/kmsdrm/SDL_kmsdrmvulkan.c

@@ -56,7 +56,7 @@ int KMSDRM_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
     if (!path) {
         path = DEFAULT_VULKAN;

src/video/offscreen/SDL_offscreenvulkan.c

@@ -74,7 +74,7 @@ int OFFSCREEN_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan loader library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
 
 #if defined(SDL_PLATFORM_APPLE)

src/video/uikit/SDL_uikitvulkan.m

@@ -59,7 +59,7 @@ int UIKit_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan loader library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
 
     if (!path) {

src/video/vivante/SDL_vivantevulkan.c

@@ -47,7 +47,7 @@ int VIVANTE_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan loader library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
     if (!path) {
         /* If no path set, try Vivante fb vulkan driver explicitly */

src/video/wayland/SDL_waylandvulkan.c

@@ -54,7 +54,7 @@ int Wayland_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan loader library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
     if (!path) {
         path = DEFAULT_VULKAN;

src/video/windows/SDL_windowsopengl.c

@@ -110,7 +110,7 @@ int WIN_GL_LoadLibrary(SDL_VideoDevice *_this, const char *path)
     void *handle;
 
     if (path == NULL) {
-        path = SDL_getenv("SDL_OPENGL_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_OPENGL_LIBRARY);
     }
     if (path == NULL) {
         path = DEFAULT_OPENGL;

src/video/windows/SDL_windowsvulkan.c

@@ -49,7 +49,7 @@ int WIN_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan loader library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
     if (!path) {
         path = "vulkan-1.dll";

src/video/x11/SDL_x11opengl.c

@@ -172,7 +172,7 @@ int X11_GL_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the OpenGL library */
     if (path == NULL) {
-        path = SDL_getenv("SDL_OPENGL_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_OPENGL_LIBRARY);
     }
     if (path == NULL) {
         path = DEFAULT_OPENGL;

src/video/x11/SDL_x11vulkan.c

@@ -58,7 +58,7 @@ int X11_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
 
     /* Load the Vulkan loader library */
     if (!path) {
-        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+        path = SDL_GetHint(SDL_HINT_VULKAN_LIBRARY);
     }
     if (!path) {
         path = DEFAULT_VULKAN;