Add ktx

2026-06-14 19:09:18 +01:00
parent 14bd1a9271
commit 13fa90a0e9
3958 changed files with 999286 additions and 4 deletions
@@ -0,0 +1,130 @@
+/* -*- tab-width: 4; -*- */
+/* vi: set sw=2 ts=4 expandtab textwidth=70: */
+
+/*
+ * Copyright 2017-2020 Mark Callow.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @internal
+ * @file
+ * @~English
+ *
+ * @brief Retrieve Vulkan function pointers needed by libktx
+ */
+
+#define UNIX 0
+#define MACOS 0
+#define WINDOWS 0
+#define IOS 0
+
+#if defined(_WIN32)
+#undef WINDOWS
+#define WINDOWS 1
+#endif
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || defined(__DragonFly__)
+#undef UNIX
+#define UNIX 1
+#endif
+#if defined(linux) || defined(__linux) || defined(__linux__)
+#undef UNIX
+#define UNIX 1
+#endif
+#if defined(__APPLE__) && defined(__x86_64__)
+#undef MACOS
+#define MACOS 1
+#endif
+#if defined(__APPLE__) && (defined(__arm64__) || defined (__arm__))
+#undef IOS
+#define IOS 1
+#endif
+#if (IOS + MACOS + UNIX + WINDOWS) > 1
+#error "Multiple OS\'s defined"
+#endif
+
+#include "vk_funcs.h"
+
+
+#if WINDOWS
+#define WINDOWS_LEAN_AND_MEAN
+#include <windows.h>
+#else
+#include <dlfcn.h>
+#include <stdlib.h>
+#endif
+#include "ktx.h"
+
+#if WINDOWS
+HMODULE ktxVulkanModuleHandle;
+#define GetVulkanModuleHandle(flags) ktxGetVulkanModuleHandle()
+#define LoadProcAddr GetProcAddress
+#elif MACOS || UNIX || IOS
+// Using NULL returns a handle that can be used to search the process that
+// loaded us and any other libraries it has loaded. That's all we need to
+// search as the app is responsible for creating the GL context so it must
+// be there.
+#define GetVulkanModuleHandle(flags) dlopen(NULL, flags)
+#define LoadProcAddr dlsym
+void* ktxVulkanModuleHandle;
+#else
+#error "Don\'t know how to load symbols on this OS."
+#endif
+
+#if WINDOWS
+#define VULKANLIB "vulkan-1.dll"
+static HMODULE
+ktxGetVulkanModuleHandle()
+{
+    HMODULE module = NULL;
+    GetModuleHandleExA(
+		0,
+		VULKANLIB,
+		&module
+	);
+	return module;
+}
+#endif
+
+ktx_error_code_e
+ktxLoadVulkanLibrary(void)
+{
+    if (ktxVulkanModuleHandle)
+        return KTX_SUCCESS;
+
+    ktxVulkanModuleHandle = GetVulkanModuleHandle(RTLD_LAZY);
+    if (ktxVulkanModuleHandle == NULL) {
+        fprintf(stderr, "Vulkan lib not linked or loaded by application.\n");
+        // Normal use is for this constructor to be called by an
+        // application that has completed OpenGL initialization. In that
+        // case the only cause for failure would be a coding error in our
+        // library loading. The only other cause would be an application
+        // calling GLUpload without having initialized OpenGL.
+#if defined(DEBUG)
+        abort();
+#else
+        return KTX_LIBRARY_NOT_LINKED; // So release version doesn't crash.
+#endif
+    }
+
+    return KTX_SUCCESS;
+}
+
+PFN_vkVoidFunction
+ktxLoadVulkanFunction(const char* pName) {
+    ktx_error_code_e rc = ktxLoadVulkanLibrary();
+    if (rc != KTX_SUCCESS) {
+        return NULL;
+    }
+
+    PFN_vkVoidFunction pfn
+           = (PFN_vkVoidFunction)LoadProcAddr(ktxVulkanModuleHandle, pName);
+    if (pfn == NULL) {
+        fprintf(stderr, "Couldn't load Vulkan command: %s\n", pName);
+        return NULL;
+    }
+    return pfn;
+}
+
+
+