switch to c++, add dxt5 and dxt1 handling

1 files changed, 166 insertions, 0 deletions

diff --git a/subprojects/glad/src/gl.c b/subprojects/glad/src/gl.c
index 1fae27b..eb3e66a 100644
--- a/subprojects/glad/src/gl.c
+++ b/subprojects/glad/src/gl.c
@@ -890,6 +890,172 @@ int gladLoadGL( GLADloadfunc load) {
 
  
 
+#ifdef GLAD_GL
+
+#ifndef GLAD_LOADER_LIBRARY_C_
+#define GLAD_LOADER_LIBRARY_C_
+
+#include <stddef.h>
+#include <stdlib.h>
+
+#if GLAD_PLATFORM_WIN32
+#include <windows.h>
+#else
+#include <dlfcn.h>
+#endif
+
+
+static void* glad_get_dlopen_handle(const char *lib_names[], int length) {
+    void *handle = NULL;
+    int i;
+
+    for (i = 0; i < length; ++i) {
+#if GLAD_PLATFORM_WIN32
+  #if GLAD_PLATFORM_UWP
+        size_t buffer_size = (strlen(lib_names[i]) + 1) * sizeof(WCHAR);
+        LPWSTR buffer = (LPWSTR) malloc(buffer_size);
+        if (buffer != NULL) {
+            int ret = MultiByteToWideChar(CP_ACP, 0, lib_names[i], -1, buffer, buffer_size);
+            if (ret != 0) {
+                handle = (void*) LoadPackagedLibrary(buffer, 0);
+            }
+            free((void*) buffer);
+        }
+  #else
+        handle = (void*) LoadLibraryA(lib_names[i]);
+  #endif
+#else
+        handle = dlopen(lib_names[i], RTLD_LAZY | RTLD_LOCAL);
+#endif
+        if (handle != NULL) {
+            return handle;
+        }
+    }
+
+    return NULL;
+}
+
+static void glad_close_dlopen_handle(void* handle) {
+    if (handle != NULL) {
+#if GLAD_PLATFORM_WIN32
+        FreeLibrary((HMODULE) handle);
+#else
+        dlclose(handle);
+#endif
+    }
+}
+
+static GLADapiproc glad_dlsym_handle(void* handle, const char *name) {
+    if (handle == NULL) {
+        return NULL;
+    }
+
+#if GLAD_PLATFORM_WIN32
+    return (GLADapiproc) GetProcAddress((HMODULE) handle, name);
+#else
+    return GLAD_GNUC_EXTENSION (GLADapiproc) dlsym(handle, name);
+#endif
+}
+
+#endif /* GLAD_LOADER_LIBRARY_C_ */
+
+typedef void* (GLAD_API_PTR *GLADglprocaddrfunc)(const char*);
+struct _glad_gl_userptr {
+    void *handle;
+    GLADglprocaddrfunc gl_get_proc_address_ptr;
+};
+
+static GLADapiproc glad_gl_get_proc(void *vuserptr, const char *name) {
+    struct _glad_gl_userptr userptr = *(struct _glad_gl_userptr*) vuserptr;
+    GLADapiproc result = NULL;
+
+    if(userptr.gl_get_proc_address_ptr != NULL) {
+        result = GLAD_GNUC_EXTENSION (GLADapiproc) userptr.gl_get_proc_address_ptr(name);
+    }
+    if(result == NULL) {
+        result = glad_dlsym_handle(userptr.handle, name);
+    }
+
+    return result;
+}
+
+static void* _gl_handle = NULL;
+
+static void* glad_gl_dlopen_handle(void) {
+#if GLAD_PLATFORM_APPLE
+    static const char *NAMES[] = {
+        "../Frameworks/OpenGL.framework/OpenGL",
+        "/Library/Frameworks/OpenGL.framework/OpenGL",
+        "/System/Library/Frameworks/OpenGL.framework/OpenGL",
+        "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL"
+    };
+#elif GLAD_PLATFORM_WIN32
+    static const char *NAMES[] = {"opengl32.dll"};
+#else
+    static const char *NAMES[] = {
+  #if defined(__CYGWIN__)
+        "libGL-1.so",
+  #endif
+        "libGL.so.1",
+        "libGL.so"
+    };
+#endif
+
+    if (_gl_handle == NULL) {
+        _gl_handle = glad_get_dlopen_handle(NAMES, sizeof(NAMES) / sizeof(NAMES[0]));
+    }
+
+    return _gl_handle;
+}
+
+static struct _glad_gl_userptr glad_gl_build_userptr(void *handle) {
+    struct _glad_gl_userptr userptr;
+
+    userptr.handle = handle;
+#if GLAD_PLATFORM_APPLE || defined(__HAIKU__)
+    userptr.gl_get_proc_address_ptr = NULL;
+#elif GLAD_PLATFORM_WIN32
+    userptr.gl_get_proc_address_ptr =
+        (GLADglprocaddrfunc) glad_dlsym_handle(handle, "wglGetProcAddress");
+#else
+    userptr.gl_get_proc_address_ptr =
+        (GLADglprocaddrfunc) glad_dlsym_handle(handle, "glXGetProcAddressARB");
+#endif
+
+    return userptr;
+}
+
+int gladLoaderLoadGL(void) {
+    int version = 0;
+    void *handle;
+    int did_load = 0;
+    struct _glad_gl_userptr userptr;
+
+    did_load = _gl_handle == NULL;
+    handle = glad_gl_dlopen_handle();
+    if (handle) {
+        userptr = glad_gl_build_userptr(handle);
+
+        version = gladLoadGLUserPtr(glad_gl_get_proc, &userptr);
+
+        if (did_load) {
+            gladLoaderUnloadGL();
+        }
+    }
+
+    return version;
+}
+
+
+
+void gladLoaderUnloadGL(void) {
+    if (_gl_handle != NULL) {
+        glad_close_dlopen_handle(_gl_handle);
+        _gl_handle = NULL;
+    }
+}
+
+#endif /* GLAD_GL */
 
 #ifdef __cplusplus
 }