/*

Simple DirectMedia Layer

Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

/*

* @author Mark Callow, www.edgewise-consulting.com. Based on Jacob Lifshay's

* SDL_x11vulkan.c.

*/

#include "../../SDL_internal.h"

#if SDL_VIDEO_VULKAN_SURFACE && SDL_VIDEO_DRIVER_COCOA

#include "SDL_cocoavideo.h"

#include "SDL_cocoawindow.h"

#include "SDL_assert.h"

#include "SDL_loadso.h"

#include "SDL_cocoametalview.h"

#include "SDL_cocoavulkan.h"

#include "SDL_syswm.h"

#include <dlfcn.h>

#define DEFAULT_MOLTENVK "libMoltenVK.dylib"

/* Since libSDL is most likely a .dylib, need RTLD_DEFAULT not RTLD_SELF. */

#define DEFAULT_HANDLE RTLD_DEFAULT

int Cocoa_Vulkan_LoadLibrary(_THIS, const char *path)

{

VkExtensionProperties *extensions = NULL;

Uint32 extensionCount = 0;

SDL_bool hasSurfaceExtension = SDL_FALSE;

SDL_bool hasMacOSSurfaceExtension = SDL_FALSE;

PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr = NULL;

if(_this->vulkan_config.loader_handle)

{

SDL_SetError("MoltenVK/Vulkan already loaded");

return -1;

}

/* Load the Vulkan loader library */

if(!path)

path = SDL_getenv("SDL_VULKAN_LIBRARY");

if(!path)

{

/* MoltenVK framework, currently, v0.17.0, has a static library and is

* the recommended way to use the package. There is likely no object to

* load. */

vkGetInstanceProcAddr =

(PFN_vkGetInstanceProcAddr)dlsym(DEFAULT_HANDLE,

"vkGetInstanceProcAddr");

}

if(vkGetInstanceProcAddr)

{

_this->vulkan_config.loader_handle = DEFAULT_HANDLE;

}

else

{

if (!path)

{

/* Look for the .dylib packaged with the application instead. */

path = DEFAULT_MOLTENVK;

}

_this->vulkan_config.loader_handle = SDL_LoadObject(path);

if(!_this->vulkan_config.loader_handle)

return -1;

SDL_strlcpy(_this->vulkan_config.loader_path, path,

SDL_arraysize(_this->vulkan_config.loader_path));

vkGetInstanceProcAddr = (PFN_vkGetInstanceProcAddr)SDL_LoadFunction(

_this->vulkan_config.loader_handle, "vkGetInstanceProcAddr");

}

if(!vkGetInstanceProcAddr)

{

SDL_SetError("Failed to find %s in either executable or %s: %s",

"vkGetInstanceProcAddr",

DEFAULT_MOLTENVK,

(const char *) dlerror());

goto fail;

}

_this->vulkan_config.vkGetInstanceProcAddr = (void *)vkGetInstanceProcAddr;

_this->vulkan_config.vkEnumerateInstanceExtensionProperties =

(void *)((PFN_vkGetInstanceProcAddr)_this->vulkan_config.vkGetInstanceProcAddr)(

VK_NULL_HANDLE, "vkEnumerateInstanceExtensionProperties");

if(!_this->vulkan_config.vkEnumerateInstanceExtensionProperties)

goto fail;

extensions = SDL_Vulkan_CreateInstanceExtensionsList(

(PFN_vkEnumerateInstanceExtensionProperties)

_this->vulkan_config.vkEnumerateInstanceExtensionProperties,

&extensionCount);

if(!extensions)

goto fail;

for(Uint32 i = 0; i < extensionCount; i++)

{

if(SDL_strcmp(VK_KHR_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)

hasSurfaceExtension = SDL_TRUE;

else if(SDL_strcmp(VK_MVK_MACOS_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)

hasMacOSSurfaceExtension = SDL_TRUE;

}

SDL_free(extensions);

if(!hasSurfaceExtension)

{

SDL_SetError("Installed MoltenVK/Vulkan doesn't implement the "

VK_KHR_SURFACE_EXTENSION_NAME " extension");

goto fail;

}

else if(!hasMacOSSurfaceExtension)

{

SDL_SetError("Installed MoltenVK/Vulkan doesn't implement the "

VK_MVK_MACOS_SURFACE_EXTENSION_NAME "extension");

goto fail;

}

return 0;

fail:

SDL_UnloadObject(_this->vulkan_config.loader_handle);

_this->vulkan_config.loader_handle = NULL;

return -1;

}

void Cocoa_Vulkan_UnloadLibrary(_THIS)

{

if(_this->vulkan_config.loader_handle)

{

if (_this->vulkan_config.loader_handle != DEFAULT_HANDLE)

SDL_UnloadObject(_this->vulkan_config.loader_handle);

_this->vulkan_config.loader_handle = NULL;

}

}

SDL_bool Cocoa_Vulkan_GetInstanceExtensions(_THIS,

SDL_Window *window,

unsigned *count,

const char **names)

{

static const char *const extensionsForCocoa[] = {

VK_KHR_SURFACE_EXTENSION_NAME, VK_MVK_MACOS_SURFACE_EXTENSION_NAME

};

if(!_this->vulkan_config.loader_handle)

{

SDL_SetError("Vulkan is not loaded");

return SDL_FALSE;

}

return SDL_Vulkan_GetInstanceExtensions_Helper(

count, names, SDL_arraysize(extensionsForCocoa),

extensionsForCocoa);

}

SDL_bool Cocoa_Vulkan_CreateSurface(_THIS,

SDL_Window *window,

VkInstance instance,

VkSurfaceKHR *surface)

{

PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr =

(PFN_vkGetInstanceProcAddr)_this->vulkan_config.vkGetInstanceProcAddr;

PFN_vkCreateMacOSSurfaceMVK vkCreateMacOSSurfaceMVK =

(PFN_vkCreateMacOSSurfaceMVK)vkGetInstanceProcAddr(

(VkInstance)instance,

"vkCreateMacOSSurfaceMVK");

VkMacOSSurfaceCreateInfoMVK createInfo = {};

VkResult result;

if(!_this->vulkan_config.loader_handle)

{

SDL_SetError("Vulkan is not loaded");

return SDL_FALSE;

}

if(!vkCreateMacOSSurfaceMVK)

{

SDL_SetError(VK_MVK_MACOS_SURFACE_EXTENSION_NAME

" extension is not enabled in the Vulkan instance.");

return SDL_FALSE;

}

createInfo.sType = VK_STRUCTURE_TYPE_MACOS_SURFACE_CREATE_INFO_MVK;

createInfo.pNext = NULL;

createInfo.flags = 0;

createInfo.pView = Cocoa_Mtl_AddMetalView(window);

result = vkCreateMacOSSurfaceMVK(instance, &createInfo,

NULL, surface);

if(result != VK_SUCCESS)

{

SDL_SetError("vkCreateMacOSSurfaceMVK failed: %s",

SDL_Vulkan_GetResultString(result));

return SDL_FALSE;

}

return SDL_TRUE;

}

void Cocoa_Vulkan_GetDrawableSize(_THIS, SDL_Window *window, int *w, int *h)

{

Cocoa_Mtl_GetDrawableSize(window, w, h);

}

#endif

/* vim: set ts=4 sw=4 expandtab: */