add gl hook

xbox/xbox.c

@@ -1099,6 +1099,74 @@ GL_API void GL_APIENTRY glPixelStorei (GLenum pname, GLint param) {
 
 
 
+
+// SDL GL hooks
+
+//#include "../../SDL_internal.h"
+
+#include <SDL.h>
+#include <./../src/video/SDL_sysvideo.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "SDL_error.h"
+
+int GL_LoadLibrary(_THIS, const char *path)
+{
+  unimplemented("%s", path);
+  return 0;
+}
+
+void * GL_GetProcAddress(_THIS, const char *proc)
+{
+  unimplemented("%s", proc);
+  return NULL;
+}
+
+void GL_UnloadLibrary(_THIS)
+{
+  return;
+}
+
+SDL_GLContext GL_CreateContext(_THIS, SDL_Window * window)
+{
+
+//  SDL_WindowData *wdata = (SDL_WindowData *) window->driverdata;
+  return (SDL_GLContext)1;
+}
+
+int GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
+{
+  return 0;
+}
+
+int GL_SetSwapInterval(_THIS, int interval)
+{
+  /* Failed to set swap interval */
+  return SDL_SetError("Unable to set the EGL swap interval");
+}
+
+int GL_GetSwapInterval(_THIS)
+{
+  return 0;
+}
+
+int GL_SwapWindow(_THIS, SDL_Window * window)
+{
+  unimplemented(); //FIXME
+  assert(0);
+  return 0;
+}
+
+void GL_DeleteContext(_THIS, SDL_GLContext context)
+{
+  return;
+}
+
+
+
+
+
 //FIXME: Use stuff like `ptr = MmAllocateContiguousMemoryEx(size, 0, 0x3ffb000, 0, 0x404);` to alloc buffer / tex
 
 // Initialization
@@ -1146,6 +1214,22 @@ __attribute__((constructor)) static void setup_xbox(void) {
   pb_show_debug_screen();
 #endif
 
+  // Pre-Init SDL so we can hijack some GL routines
+  //FIXME: This breaks if the app initializes SDL after uninitializing
+  int ret = SDL_InitSubSystem(SDL_INIT_VIDEO);
+  assert(ret == 0);
+  SDL_VideoDevice* device = SDL_GetVideoDevice();
+  assert(device != NULL);
+  device->GL_LoadLibrary = GL_LoadLibrary;
+  device->GL_GetProcAddress = GL_GetProcAddress;
+  device->GL_UnloadLibrary = GL_UnloadLibrary;
+  device->GL_CreateContext = GL_CreateContext;
+  device->GL_MakeCurrent = GL_MakeCurrent;
+  device->GL_SetSwapInterval = GL_SetSwapInterval;
+  device->GL_GetSwapInterval = GL_GetSwapInterval;
+  device->GL_SwapWindow = GL_SwapWindow;
+  device->GL_DeleteContext = GL_DeleteContext;
+
   // Retrieve created size
   //FIXME: why? - probably not needed
   int width = pb_back_buffer_width();