Move glad files to thirdparty dir

drivers/gl_context/SCsub

@@ -3,28 +3,18 @@
 Import('env')
 
 if (env["platform"] in ["haiku", "osx", "windows", "x11"]):
-    # FIXME: Dead code, now using GLAD
-    """
     # Thirdparty source files
-    if (env['builtin_glew'] != 'no'):  # builtin
-
-        thirdparty_dir = "#thirdparty/glew/"
+    thirdparty_dir = "#thirdparty/glad/"
     thirdparty_sources = [
-            "glew.c",
+        "glad.c",
     ]
     thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
 
     env.add_source_files(env.drivers_sources, thirdparty_sources)
-        env.Append(CPPFLAGS=['-DGLEW_STATIC'])
     env.Append(CPPPATH=[thirdparty_dir])
 
-    env.Append(CPPFLAGS=['-DGLEW_ENABLED'])
-    """
-
-    env.add_source_files(env.drivers_sources,"glad.c")
     env.Append(CPPFLAGS=['-DGLAD_ENABLED'])
     env.Append(CPPFLAGS=['-DGLES_OVER_GL'])
-    env.Append(CPPPATH = ['.'])
 
 # Godot source files
 env.add_source_files(env.drivers_sources, "*.cpp")

platform/osx/platform_config.h

@@ -28,7 +28,5 @@
 /*************************************************************************/
 #include <alloca.h>
 
-//#define GLES2_INCLUDE_H "GL/glew.h"
-//#define GLES3_INCLUDE_H "GL/glew.h"
-#define GLES3_INCLUDE_H "gl_context/glad/glad.h"
+#define GLES3_INCLUDE_H "glad/glad.h"
 #define PTHREAD_RENAME_SELF

platform/windows/platform_config.h

@@ -30,5 +30,4 @@
 //#else
 //#include <alloca.h>
 //#endif
-//#define GLES2_INCLUDE_H "GL/glew.h"
-#define GLES3_INCLUDE_H "gl_context/glad/glad.h"
+#define GLES3_INCLUDE_H "glad/glad.h"

platform/x11/platform_config.h

@@ -34,6 +34,4 @@
 #define PTHREAD_BSD_SET_NAME
 #endif
 
-#define GLES2_INCLUDE_H "GL/glew.h"
-//#define GLES3_INCLUDE_H "GL/glew.h"
-#define GLES3_INCLUDE_H "gl_context/glad/glad.h"
+#define GLES3_INCLUDE_H "glad/glad.h"

thirdparty/glad/glad/glad.h

@@ -85,7 +85,7 @@ GLAPI int gladLoadGL(void);
 GLAPI int gladLoadGLLoader(GLADloadproc);
 
 #include <stddef.h>
-#include <gl_context/KHR/khrplatform.h>
+#include <KHR/khrplatform.h>
 #ifndef GLEXT_64_TYPES_DEFINED
 /* This code block is duplicated in glxext.h, so must be protected */
 #define GLEXT_64_TYPES_DEFINED