goldberg_emulator/overlay_experimental/linux/OpenGLX_Hook.cpp
2019-09-01 20:53:16 +02:00

153 lines
3.2 KiB
C++

#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);
UnhookAll();
BeginHook();
HookFuncs(
std::make_pair<void**, void*>(&(void*&)_glXSwapBuffers, (void*)&OpenGLX_Hook::MyglXSwapBuffers)
);
EndHook();
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();
ImGui::DestroyContext();
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)
{
PRINT_DEBUG("Called SwapBuffer hook");
if( ! initialized )
{
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO();
io.IniFilename = NULL;
ImGui_ImplOpenGL3_Init();
initialized = true;
}
if( initialized )
{
ImGuiIO& io = ImGui::GetIO();
GLint m_viewport[4];
glGetIntegerv( GL_VIEWPORT, m_viewport );
int width = m_viewport[2];
int height = m_viewport[3];
ImGui_ImplOpenGL3_NewFrame();
X11_Hook::Inst()->prepareForOverlay(display);
ImGui::NewFrame();
get_steam_client()->steam_overlay->OverlayProc(width, height);
ImGui::EndFrame();
ImGui::Render();
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
}
}
void OpenGLX_Hook::MyglXSwapBuffers(Display* display, GLXDrawable drawable)
{
OpenGLX_Hook::Inst()->prepareForOverlay(display);
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();
}
//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__