glad: Sync with upstream 0.1.31

(cherry picked from commit 2bbcc521b6)

COPYRIGHT.txt

@@ -165,7 +165,7 @@ License: FTL
 
 Files: ./thirdparty/glad/
 Comment: glad
-Copyright: 2013-2018, David Herberth
+Copyright: 2013-2019, David Herberth
 License: Expat
 
 Files: ./thirdparty/jpeg_compressor/

thirdparty/README.md

@@ -131,7 +131,7 @@ Files extracted from upstream source:
 ## glad
 
 - Upstream: https://github.com/Dav1dde/glad
-- Version: 0.1.29
+- Version: 0.1.31
 - License: MIT
 
 The files we package are automatically generated.

thirdparty/glad/KHR/khrplatform.h

@@ -90,12 +90,20 @@
  *                                  int arg2) KHRONOS_APIATTRIBUTES;
  */
 
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
 /*-------------------------------------------------------------------------
  * Definition of KHRONOS_APICALL
  *-------------------------------------------------------------------------
  * This precedes the return type of the function in the function prototype.
  */
-#if defined(_WIN32) && !defined(__SCITECH_SNAP__)
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
 #   define KHRONOS_APICALL __declspec(dllimport)
 #elif defined (__SYMBIAN32__)
 #   define KHRONOS_APICALL IMPORT_C
@@ -111,7 +119,7 @@
  * This follows the return type of the function  and precedes the function
  * name in the function prototype.
  */
-#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(KHRONOS_STATIC)
     /* Win32 but not WinCE */
 #   define KHRONOS_APIENTRY __stdcall
 #else

thirdparty/glad/glad.c

@@ -1,6 +1,6 @@
 /*
 
-    OpenGL loader generated by glad 0.1.29 on Mon Mar  4 12:47:22 2019.
+    OpenGL loader generated by glad 0.1.31 on Thu Jul 11 10:09:18 2019.
 
     Language/Generator: C/C++
     Specification: gl

thirdparty/glad/glad/glad.h

@@ -1,6 +1,6 @@
 /*
 
-    OpenGL loader generated by glad 0.1.29 on Mon Mar  4 12:47:22 2019.
+    OpenGL loader generated by glad 0.1.31 on Thu Jul 11 10:09:18 2019.
 
     Language/Generator: C/C++
     Specification: gl
@@ -31,13 +31,7 @@
 #define __gl_h_
 
 #if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__) && !defined(__SCITECH_SNAP__)
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN 1
-#endif
-#ifndef NOMINMAX
-#define NOMINMAX 1
-#endif
-#include <windows.h>
+#define APIENTRY __stdcall
 #endif
 
 #ifndef APIENTRY