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gl/context/wgl: implement a better get_proc_address()

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Look in opengl32.dll first, then wglGetProcAddress(), and only then
possibly from any linked in libraries.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1165>
This commit is contained in:
Matthew Waters 2021-05-20 22:52:56 +10:00
parent f8510ae3c8
commit 512160a1c8
1 changed files with 32 additions and 2 deletions
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34
gst-libs/gst/gl/wgl/gstglcontext_wgl.c
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@ -24,6 +24,7 @@
#endif
#include <gst/gst.h>
#include <gmodule.h>
#include <gst/gl/gl.h>
#include <gst/gl/gstglfuncs.h>
@ -468,14 +469,43 @@ gst_gl_context_wgl_check_feature (GstGLContext * context, const gchar * feature)
return gst_gl_check_extension (feature, context_wgl->priv->wgl_exts);
}
static GOnce module_opengl_dll_gonce = G_ONCE_INIT;
static GModule *module_opengl_dll;
static gpointer
load_opengl_dll_module (gpointer user_data)
{
#ifdef GST_GL_LIBGL_MODULE_NAME
module_opengl_dll =
g_module_open (GST_GL_LIBGL_MODULE_NAME, G_MODULE_BIND_LAZY);
#else
if (g_strcmp0 (G_MODULE_SUFFIX, "dll") == 0)
module_opengl_dll = g_module_open ("opengl32.dll", G_MODULE_BIND_LAZY);
/* This automatically handles the suffix and even .la files */
if (!module_opengl_dll)
module_opengl_dll = g_module_open ("opengl32", G_MODULE_BIND_LAZY);
#endif
return NULL;
}
gpointer
gst_gl_context_wgl_get_proc_address (GstGLAPI gl_api, const gchar * name)
{
gpointer result;
if (!(result = gst_gl_context_default_get_proc_address (gl_api, name))) {
result = wglGetProcAddress ((LPCSTR) name);
if (gl_api & (GST_GL_API_OPENGL | GST_GL_API_OPENGL3)) {
g_once (&module_opengl_dll_gonce, load_opengl_dll_module, NULL);
if (module_opengl_dll)
g_module_symbol (module_opengl_dll, name, &result);
if (!result) {
result = wglGetProcAddress ((LPCSTR) name);
}
}
if (!result)
result = gst_gl_context_default_get_proc_address (gl_api, name);
return result;
}