Made citra use OpenGL 2.1

Changed the Readme for the generated files to reflect the new command.

src/video_core/CMakeLists.txt

@@ -1,5 +1,5 @@
 set(SRCS
-            renderer_opengl/generated/gl_3_2_core.c
+            renderer_opengl/generated/gl_2_1_core.c
             renderer_opengl/renderer_opengl.cpp
             renderer_opengl/gl_shader_util.cpp
             debug_utils/debug_utils.cpp
@@ -14,7 +14,7 @@ set(SRCS
 
 set(HEADERS
             debug_utils/debug_utils.h
-            renderer_opengl/generated/gl_3_2_core.h
+            renderer_opengl/generated/gl_2_1_core.h
             renderer_opengl/gl_shader_util.h
             renderer_opengl/gl_shaders.h
             renderer_opengl/renderer_opengl.h

src/video_core/renderer_opengl/generated/Readme.md

@@ -1,5 +1,5 @@
 These file were generated by the [glLoadGen](https://bitbucket.org/alfonse/glloadgen/wiki/Home) OpenGL loader generator and have been checked in as-is. You can re-generate them using version 2.0.2 of glLoadGen and executing the following command:
 
 ```
-lua LoadGen.lua -version 3.2 -profile core -indent space 3_2_core
+lua LoadGen.lua -version 2.1 -profile core -indent space -ext ARB_vertex_array_object 2_1_core
 ```

src/video_core/renderer_opengl/gl_shader_util.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include "generated/gl_3_2_core.h"
+#include "generated/gl_2_1_core.h"
 
 namespace ShaderUtil {
 

src/video_core/renderer_opengl/renderer_opengl.h

@@ -6,7 +6,7 @@
 
 #include <array>
 
-#include "generated/gl_3_2_core.h"
+#include "generated/gl_2_1_core.h"
 
 #include "common/math_util.h"