1 files changed, 108 insertions, 0 deletions
diff --git a/src/glx/windows/wgl.c b/src/glx/windows/wgl.c
new file mode 100644
index 00000000000..ffc97675072
--- /dev/null
+++ b/src/glx/windows/wgl.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright © 2014 Jon Turney
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/*
+  Wrapper functions for calling WGL extension functions
+ */
+
+#include "wgl.h"
+
+#include <stdio.h>
+
+#define RESOLVE_DECL(type) \
+    static type type##proc = NULL;
+
+#define PRERESOLVE(type, symbol) \
+    type##proc = (type)wglGetProcAddress(symbol); \
+    if (type##proc == NULL) \
+       printf("Can't resolve \"%s\"\n", symbol);
+
+#define CHECK_RESOLVED(type, retval) \
+  if (type##proc == NULL) { \
+    return retval; \
+  }
+
+#define RESOLVED_PROC(type) type##proc
+
+RESOLVE_DECL(PFNWGLGETEXTENSIONSSTRINGARBPROC);
+RESOLVE_DECL(PFNWGLCREATECONTEXTATTRIBSARBPROC);
+RESOLVE_DECL(PFNWGLMAKECONTEXTCURRENTARBPROC);
+RESOLVE_DECL(PFNWGLCREATEPBUFFERARBPROC);
+RESOLVE_DECL(PFNWGLGETPBUFFERDCARBPROC);
+RESOLVE_DECL(PFNWGLRELEASEPBUFFERDCARBPROC);
+RESOLVE_DECL(PFNWGLDESTROYPBUFFERARBPROC);
+
+void wglResolveExtensionProcs(void)
+{
+  PRERESOLVE(PFNWGLGETEXTENSIONSSTRINGARBPROC, "wglGetExtensionsStringARB");
+  PRERESOLVE(PFNWGLCREATECONTEXTATTRIBSARBPROC, "wglCreateContextAttribsARB");
+  PRERESOLVE(PFNWGLMAKECONTEXTCURRENTARBPROC, "wglMakeContextCurrentARB");
+  PRERESOLVE(PFNWGLCREATEPBUFFERARBPROC, "wglCreatePbufferARB");
+  PRERESOLVE(PFNWGLGETPBUFFERDCARBPROC, "wglGetPbufferDCARB");
+  PRERESOLVE(PFNWGLRELEASEPBUFFERDCARBPROC, "wglReleasePbufferDCARB");
+  PRERESOLVE(PFNWGLDESTROYPBUFFERARBPROC, "wglDestroyPbufferARB");
+}
+
+const char *wglGetExtensionsStringARB(HDC hdc_)
+{
+   CHECK_RESOLVED(PFNWGLGETEXTENSIONSSTRINGARBPROC, "");
+   return RESOLVED_PROC(PFNWGLGETEXTENSIONSSTRINGARBPROC)(hdc_);
+}
+
+HGLRC wglCreateContextAttribsARB(HDC hdc_, HGLRC hShareContext_,
+                                     const int *attribList_)
+{
+   CHECK_RESOLVED(PFNWGLCREATECONTEXTATTRIBSARBPROC, NULL);
+   return RESOLVED_PROC(PFNWGLCREATECONTEXTATTRIBSARBPROC)(hdc_, hShareContext_, attribList_);
+}
+
+BOOL wglMakeContextCurrentARB(HDC hDrawDC_, HDC hReadDC_, HGLRC hglrc_)
+{
+   CHECK_RESOLVED(PFNWGLMAKECONTEXTCURRENTARBPROC, FALSE);
+   return RESOLVED_PROC(PFNWGLMAKECONTEXTCURRENTARBPROC)(hDrawDC_, hReadDC_, hglrc_);
+}
+
+HPBUFFERARB wglCreatePbufferARB(HDC hDC_, int iPixelFormat_, int iWidth_,
+                                int iHeight_, const int *piAttribList_)
+{
+   CHECK_RESOLVED(PFNWGLCREATEPBUFFERARBPROC, NULL);
+   return RESOLVED_PROC(PFNWGLCREATEPBUFFERARBPROC)(hDC_, iPixelFormat_, iWidth_, iHeight_, piAttribList_);
+}
+
+HDC wglGetPbufferDCARB(HPBUFFERARB hPbuffer_)
+{
+   CHECK_RESOLVED(PFNWGLGETPBUFFERDCARBPROC, NULL);
+   return RESOLVED_PROC(PFNWGLGETPBUFFERDCARBPROC)(hPbuffer_);
+}
+
+int wglReleasePbufferDCARB(HPBUFFERARB hPbuffer_, HDC hDC_)
+{
+   CHECK_RESOLVED(PFNWGLRELEASEPBUFFERDCARBPROC, 0)
+   return RESOLVED_PROC(PFNWGLRELEASEPBUFFERDCARBPROC)(hPbuffer_, hDC_);
+}
+
+BOOL wglDestroyPbufferARB(HPBUFFERARB hPbuffer_)
+{
+   CHECK_RESOLVED(PFNWGLDESTROYPBUFFERARBPROC, FALSE);
+   return RESOLVED_PROC(PFNWGLDESTROYPBUFFERARBPROC)(hPbuffer_);
+}