goldberg_emulator/overlay_experimental/linux/OpenGLX_Hook.cpp

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#include "OpenGLX_Hook.h"
#include "X11_Hook.h"
#include "../Renderer_Detector.h"
#include "../dll/dll.h"
#ifdef __LINUX__
#ifndef NO_OVERLAY
#include <imgui.h>
#include <impls/imgui_impl_opengl3.h>
#include "../steam_overlay.h"
OpenGLX_Hook* OpenGLX_Hook::_inst = nullptr;
bool OpenGLX_Hook::start_hook()
{
bool res = true;
if (!hooked)
{
if (!X11_Hook::Inst()->start_hook())
return false;
GLenum err = glewInit();
if (err == GLEW_OK)
{
PRINT_DEBUG("Hooked OpenGLX\n");
hooked = true;
Renderer_Detector::Inst().renderer_found(this);
/*
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UnhookAll();
BeginHook();
HookFuncs(
std::make_pair<void**, void*>(&(void*&)_glXSwapBuffers, (void*)&OpenGLX_Hook::MyglXSwapBuffers)
);
EndHook();
*/
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get_steam_client()->steam_overlay->HookReady();
}
else
{
PRINT_DEBUG("Failed to hook OpenGLX\n");
/* Problem: glewInit failed, something is seriously wrong. */
PRINT_DEBUG("Error: %s\n", glewGetErrorString(err));
res = false;
}
}
return true;
}
void OpenGLX_Hook::resetRenderState()
{
if (initialized)
{
ImGui_ImplOpenGL3_Shutdown();
X11_Hook::Inst()->resetRenderState();
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ImGui::DestroyContext();
glXDestroyContext(display, context);
display = nullptr;
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initialized = false;
}
}
// Try to make this function and overlay's proc as short as possible or it might affect game's fps.
void OpenGLX_Hook::prepareForOverlay(Display* display, GLXDrawable drawable)
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{
PRINT_DEBUG("Called SwapBuffer hook");
if( (Window)drawable != X11_Hook::Inst()->get_game_wnd() )
X11_Hook::Inst()->resetRenderState();
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if( ! initialized )
{
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO();
io.IniFilename = NULL;
ImGui_ImplOpenGL3_Init();
int attributes[] = { //can't be const b/c X11 doesn't like it. Not sure if that's intentional or just stupid.
GLX_RGBA, //apparently nothing comes after this?
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
//Ideally, the size would be 32 (or at least 24), but I have actually seen
// this size (on a modern OS even).
GLX_DEPTH_SIZE, 16,
GLX_DOUBLEBUFFER, True,
None
};
XVisualInfo* visual_info = glXChooseVisual(display, DefaultScreen(display), attributes);
context = glXCreateContext(display, visual_info, nullptr, True);
this->display = display;
get_steam_client()->steam_overlay->CreateFonts();
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initialized = true;
}
auto oldContext = glXGetCurrentContext();
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glXMakeCurrent(display, drawable, context);
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ImGui_ImplOpenGL3_NewFrame();
X11_Hook::Inst()->prepareForOverlay(display, (Window)drawable);
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ImGui::NewFrame();
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get_steam_client()->steam_overlay->OverlayProc();
ImGui::Render();
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
glXMakeCurrent(display, drawable, oldContext);
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}
void OpenGLX_Hook::MyglXSwapBuffers(Display* display, GLXDrawable drawable)
{
OpenGLX_Hook::Inst()->prepareForOverlay(display, drawable);
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OpenGLX_Hook::Inst()->_glXSwapBuffers(display, drawable);
}
OpenGLX_Hook::OpenGLX_Hook():
initialized(false),
hooked(false),
_glXSwapBuffers(nullptr)
{
//_library = dlopen(DLL_NAME);
}
OpenGLX_Hook::~OpenGLX_Hook()
{
PRINT_DEBUG("OpenGLX Hook removed\n");
if (initialized)
{
ImGui_ImplOpenGL3_Shutdown();
ImGui::DestroyContext();
glXDestroyContext(display, context);
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}
//dlclose(_library);
_inst = nullptr;
}
OpenGLX_Hook* OpenGLX_Hook::Inst()
{
if (_inst == nullptr)
_inst = new OpenGLX_Hook;
return _inst;
}
const char* OpenGLX_Hook::get_lib_name() const
{
return DLL_NAME;
}
void OpenGLX_Hook::loadFunctions(decltype(glXSwapBuffers)* pfnglXSwapBuffers)
{
_glXSwapBuffers = pfnglXSwapBuffers;
}
#endif//NO_OVERLAY
#endif//__LINUX__