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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "lib/streflop/streflop_cond.h" //! must happen before OffscreenGLContext.h, which includes agl.h
#include "System/OffscreenGLContext.h"
#include <functional>
#include "System/Exceptions.h"
#include "System/MainDefines.h"
#include "System/SafeUtil.h"
#include "System/Log/ILog.h"
#include "System/Platform/errorhandler.h"
#include "System/Platform/Threading.h"
#include "System/Threading/SpringThreading.h"
#ifndef HEADLESS
static PFNGLACTIVETEXTUREPROC mainGlActiveTexture = NULL;
#endif
#ifdef HEADLESS
/////////////////////////////////////////////////////////////////////////////////////////////////
//! Headless
COffscreenGLContext::COffscreenGLContext() {}
COffscreenGLContext::~COffscreenGLContext() {}
void COffscreenGLContext::WorkerThreadPost() {}
void COffscreenGLContext::WorkerThreadFree() {}
#elif WIN32
/////////////////////////////////////////////////////////////////////////////////////////////////
//! WINDOWS
#include <GL/wglew.h>
COffscreenGLContext::COffscreenGLContext()
{
//! this creates a 2nd OpenGL context on the >onscreen< window/HDC
//! so don't render to the the default framebuffer (always bind FBOs,DLs,...) !!!
if (!mainGlActiveTexture)
mainGlActiveTexture = (PFNGLACTIVETEXTUREPROC)wglGetProcAddress("glActiveTexture");
//! get the main (onscreen) GL context
HGLRC mainRC = wglGetCurrentContext();
hdc = wglGetCurrentDC();
if (!hdc || !mainRC) {
throw opengl_error("Couldn't create an offscreen GL context: wglGetCurrentDC failed!");
}
int status = TRUE;
offscreenRC = NULL;
#ifdef WGL_ARB_create_context
if (wglCreateContextAttribsARB) {
static const int contextAttribs[] = { WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_DEBUG_BIT_ARB, 0 };
offscreenRC = wglCreateContextAttribsARB(hdc, mainRC, contextAttribs);
if (!offscreenRC)
LOG_L(L_WARNING, "Couldn't create an offscreen GL context: wglCreateContextAttribsARB failed!");
}
#endif
if (!offscreenRC) {
//! create a 2nd GL context
offscreenRC = wglCreateContext(hdc);
if (!offscreenRC) {
throw opengl_error("Couldn't create an offscreen GL context: wglCreateContext failed!");
}
//! share the GL resources (textures,DLists,shaders,...)
if (!wglMakeCurrent(NULL, NULL))
throw opengl_error("Could not deactivate rendering context");
status = wglShareLists(mainRC, offscreenRC);
if (!wglMakeCurrent(hdc, mainRC))
throw opengl_error("Could not activate rendering context");
}
if (!status) {
DWORD err = GetLastError();
char msg[256];
SNPRINTF(msg, 255, "Couldn't create an offscreen GL context: wglShareLists failed (error: %i)!", (int)err);
throw opengl_error(msg);
}
}
COffscreenGLContext::~COffscreenGLContext() {
wglDeleteContext(offscreenRC);
}
void COffscreenGLContext::WorkerThreadPost()
{
//! activate the offscreen GL context in the worker thread
if (!wglMakeCurrent(hdc, offscreenRC))
throw opengl_error("Could not activate worker rendering context");
const PFNGLACTIVETEXTUREPROC workerGlActiveTexture = (PFNGLACTIVETEXTUREPROC)wglGetProcAddress("glActiveTexture");
if (workerGlActiveTexture != mainGlActiveTexture) {
WorkerThreadFree();
throw opengl_error("Could not activate worker rendering context (uses different function pointers)");
}
}
void COffscreenGLContext::WorkerThreadFree()
{
//! must run in the same thread as the offscreen GL context!
if (!wglMakeCurrent(NULL, NULL))
throw opengl_error("Could not deactivate worker rendering context");
}
#elif __APPLE__
/////////////////////////////////////////////////////////////////////////////////////////////////
//! APPLE
#include <OpenGL/CGLCurrent.h>
#include <OpenGL/OpenGL.h>
COffscreenGLContext::COffscreenGLContext()
{
// Get Current OnScreen Context
CGLContextObj currentCglCtx = CGLGetCurrentContext();
if (!currentCglCtx)
throw opengl_error("Couldn't create an offscreen GL context: CGLGetCurrentContext failed!");
// Get PixelFormat
CGLPixelFormatAttribute attribs[] = {
(CGLPixelFormatAttribute)0
};
GLint numPixelFormats = 0;
CGLPixelFormatObj cglPxlfmt = NULL;
CGLChoosePixelFormat(attribs, &cglPxlfmt, &numPixelFormats);
if (!cglPxlfmt)
throw opengl_error("Couldn't create an offscreen GL context: CGLChoosePixelFmt failed!");
// Create Shared Context
CGLCreateContext(cglPxlfmt, currentCglCtx, &cglWorkerCtx);
CGLDestroyPixelFormat(cglPxlfmt);
if (!cglWorkerCtx)
throw opengl_error("Couldn't create an offscreen GL context: CGLCreateContext failed!");
}
COffscreenGLContext::~COffscreenGLContext() {
CGLDestroyContext(cglWorkerCtx);
}
void COffscreenGLContext::WorkerThreadPost()
{
CGLError err = CGLSetCurrentContext(cglWorkerCtx);
if (kCGLNoError != err) {
LOG_L(L_ERROR, "%s", CGLErrorString(err));
throw opengl_error("Could not activate worker rendering context");
}
}
void COffscreenGLContext::WorkerThreadFree()
{
CGLError err = CGLSetCurrentContext(NULL);
if (kCGLNoError != err) {
LOG_L(L_ERROR, "%s", CGLErrorString(err));
throw opengl_error("Could not deactivate worker rendering context");
}
}
#else
/////////////////////////////////////////////////////////////////////////////////////////////////
//! UNIX
#include <SDL.h>
#include <SDL_syswm.h>
COffscreenGLContext::COffscreenGLContext()
{
if (!mainGlActiveTexture)
mainGlActiveTexture = (PFNGLACTIVETEXTUREPROC)glXGetProcAddress((const GLubyte*)"glActiveTexture");
//! Get MainCtx & X11-Display
GLXContext mainCtx = glXGetCurrentContext();
display = glXGetCurrentDisplay();
//GLXDrawable mainDrawable = glXGetCurrentDrawable();
if(!mainCtx)
throw opengl_error("Couldn't create an offscreen GL context: glXGetCurrentContext failed!");
if (!display)
throw opengl_error("Couldn't create an offscreen GL context: Couldn't determine display!");
int scrnum = XDefaultScreen(display);
//! Create a FBConfig
int nelements = 0;
const int fbattribs[] = {
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT,
GLX_BUFFER_SIZE, 32,
GLX_DEPTH_SIZE, 24,
GLX_STENCIL_SIZE, 8,
None
};
GLXFBConfig* fbcfg = glXChooseFBConfig(display, scrnum, (const int*)fbattribs, &nelements);
if (!fbcfg || (nelements == 0))
throw opengl_error("Couldn't create an offscreen GL context: glXChooseFBConfig failed!");
//! Create a pbuffer (each render context needs a drawable)
const int pbuf_attribs[] = {
GLX_PBUFFER_WIDTH, 1,
GLX_PBUFFER_HEIGHT, 1,
GLX_PRESERVED_CONTENTS, false,
None
};
pbuf = glXCreatePbuffer(display, fbcfg[0], (const int*)pbuf_attribs);
if (!pbuf)
throw opengl_error("Couldn't create an offscreen GL context: glXCreatePbuffer failed!");
/*
//Create a GL 3.0 context
const int ctx_attribs[] = {
//GLX_CONTEXT_MAJOR_VERSION_ARB, 2,
//GLX_CONTEXT_MINOR_VERSION_ARB, 0,
GLX_CONTEXT_FLAGS_ARB,
GLX_CONTEXT_DEBUG_BIT_ARB,
//GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
None
};
workerCtx = glXCreateContextAttribsARB(display, fbcfg[0], mainCtx, true, ctx_attribs);
*/
//! Create render context
workerCtx = glXCreateNewContext(display, fbcfg[0], GLX_RGBA_TYPE, mainCtx, true);
if (!workerCtx)
throw opengl_error("Couldn't create an offscreen GL context: glXCreateNewContext failed!");
XFree(fbcfg);
}
COffscreenGLContext::~COffscreenGLContext() {
glXDestroyContext(display, workerCtx);
glXDestroyPbuffer(display, pbuf);
}
void COffscreenGLContext::WorkerThreadPost()
{
if (!glXMakeCurrent(display, pbuf, workerCtx))
throw opengl_error("Could not activate worker rendering context");
const PFNGLACTIVETEXTUREPROC workerGlActiveTexture = (PFNGLACTIVETEXTUREPROC)glXGetProcAddress((const GLubyte*)"glActiveTexture");
if (workerGlActiveTexture != mainGlActiveTexture) {
WorkerThreadFree();
throw opengl_error("Could not activate worker rendering context (uses different function pointers)");
}
}
void COffscreenGLContext::WorkerThreadFree()
{
if (!glXMakeCurrent(display, None, NULL))
throw opengl_error("Could not deactivate worker rendering context");
}
#endif
/******************************************************************************/
/******************************************************************************/
COffscreenGLThread::COffscreenGLThread(std::function<void()> f) :
thread(NULL),
glOffscreenCtx() //! may trigger an opengl_error exception!
{
thread = new spring::thread( std::bind(&COffscreenGLThread::WrapFunc, this, f) );
}
COffscreenGLThread::~COffscreenGLThread()
{
Join();
}
void COffscreenGLThread::Join()
{
if (thread)
thread->join();
spring::SafeDelete(thread);
}
__FORCE_ALIGN_STACK__
void COffscreenGLThread::WrapFunc(std::function<void()> f)
{
Threading::SetThreadName("OffscreenGLThread");
glOffscreenCtx.WorkerThreadPost();
// init streflop
// not needed for sync'ness (precision flags are per-process)
// but fpu exceptions are per-thread
streflop::streflop_init<streflop::Simple>();
try {
f();
} CATCH_SPRING_ERRORS
glOffscreenCtx.WorkerThreadFree();
}
/******************************************************************************/
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