131 lines
3.0 KiB
C
131 lines
3.0 KiB
C
/* -*- tab-width: 4; -*- */
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/* vi: set sw=2 ts=4 expandtab textwidth=70: */
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/*
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* Copyright 2017-2020 Mark Callow.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @internal
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* @file
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* @~English
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*
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* @brief Retrieve Vulkan function pointers needed by libktx
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*/
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#define UNIX 0
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#define MACOS 0
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#define WINDOWS 0
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#define IOS 0
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#if defined(_WIN32)
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#undef WINDOWS
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#define WINDOWS 1
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#endif
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || defined(__DragonFly__)
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#undef UNIX
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#define UNIX 1
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#endif
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#if defined(linux) || defined(__linux) || defined(__linux__)
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#undef UNIX
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#define UNIX 1
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#endif
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#if defined(__APPLE__) && defined(__x86_64__)
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#undef MACOS
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#define MACOS 1
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#endif
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#if defined(__APPLE__) && (defined(__arm64__) || defined (__arm__))
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#undef IOS
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#define IOS 1
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#endif
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#if (IOS + MACOS + UNIX + WINDOWS) > 1
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#error "Multiple OS\'s defined"
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#endif
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#include "vk_funcs.h"
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#if WINDOWS
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#define WINDOWS_LEAN_AND_MEAN
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#include <windows.h>
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#else
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#include <dlfcn.h>
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#include <stdlib.h>
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#endif
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#include "ktx.h"
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#if WINDOWS
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HMODULE ktxVulkanModuleHandle;
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#define GetVulkanModuleHandle(flags) ktxGetVulkanModuleHandle()
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#define LoadProcAddr GetProcAddress
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#elif MACOS || UNIX || IOS
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// Using NULL returns a handle that can be used to search the process that
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// loaded us and any other libraries it has loaded. That's all we need to
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// search as the app is responsible for creating the GL context so it must
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// be there.
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#define GetVulkanModuleHandle(flags) dlopen(NULL, flags)
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#define LoadProcAddr dlsym
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void* ktxVulkanModuleHandle;
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#else
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#error "Don\'t know how to load symbols on this OS."
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#endif
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#if WINDOWS
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#define VULKANLIB "vulkan-1.dll"
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static HMODULE
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ktxGetVulkanModuleHandle()
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{
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HMODULE module = NULL;
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GetModuleHandleExA(
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0,
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VULKANLIB,
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&module
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);
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return module;
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}
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#endif
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ktx_error_code_e
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ktxLoadVulkanLibrary(void)
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{
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if (ktxVulkanModuleHandle)
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return KTX_SUCCESS;
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ktxVulkanModuleHandle = GetVulkanModuleHandle(RTLD_LAZY);
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if (ktxVulkanModuleHandle == NULL) {
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fprintf(stderr, "Vulkan lib not linked or loaded by application.\n");
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// Normal use is for this constructor to be called by an
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// application that has completed OpenGL initialization. In that
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// case the only cause for failure would be a coding error in our
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// library loading. The only other cause would be an application
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// calling GLUpload without having initialized OpenGL.
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#if defined(DEBUG)
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abort();
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#else
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return KTX_LIBRARY_NOT_LINKED; // So release version doesn't crash.
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#endif
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}
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return KTX_SUCCESS;
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}
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PFN_vkVoidFunction
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ktxLoadVulkanFunction(const char* pName) {
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ktx_error_code_e rc = ktxLoadVulkanLibrary();
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if (rc != KTX_SUCCESS) {
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return NULL;
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}
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PFN_vkVoidFunction pfn
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= (PFN_vkVoidFunction)LoadProcAddr(ktxVulkanModuleHandle, pName);
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if (pfn == NULL) {
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fprintf(stderr, "Couldn't load Vulkan command: %s\n", pName);
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return NULL;
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}
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return pfn;
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}
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