irrlicht/source/Irrlicht/CGLXManager.cpp

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// Copyright (C) 2013 Christian Stehno
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in Irrlicht.h
#include "CGLXManager.h"
#ifdef _IRR_COMPILE_WITH_GLX_MANAGER_
#include "os.h"
#define GL_GLEXT_LEGACY 1
#define GLX_GLXEXT_LEGACY 1
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glext.h>
#include <GL/glxext.h>
namespace irr
{
namespace video
{
CGLXManager::CGLXManager(const SIrrlichtCreationParameters &params, const SExposedVideoData &videodata, int screennr) :
Params(params), PrimaryContext(videodata), VisualInfo(0), glxFBConfig(0), GlxWin(0)
{
#ifdef _DEBUG
setDebugName("CGLXManager");
#endif
CurrentContext.OpenGLLinux.X11Display = PrimaryContext.OpenGLLinux.X11Display;
int major, minor;
Display *display = (Display *)PrimaryContext.OpenGLLinux.X11Display;
const bool isAvailableGLX = glXQueryExtension(display, &major, &minor);
if (isAvailableGLX && glXQueryVersion(display, &major, &minor)) {
#if defined(GLX_VERSION_1_3)
typedef GLXFBConfig *(*PFNGLXCHOOSEFBCONFIGPROC)(Display *dpy, int screen, const int *attrib_list, int *nelements);
PFNGLXCHOOSEFBCONFIGPROC glxChooseFBConfig = (PFNGLXCHOOSEFBCONFIGPROC)glXGetProcAddress(reinterpret_cast<const GLubyte *>("glXChooseFBConfig"));
if (major == 1 && minor > 2 && glxChooseFBConfig) {
os::Printer::log("GLX >= 1.3", ELL_DEBUG);
// attribute array for the draw buffer
int visualAttrBuffer[] =
{
GLX_RENDER_TYPE,
GLX_RGBA_BIT,
GLX_RED_SIZE,
4,
GLX_GREEN_SIZE,
4,
GLX_BLUE_SIZE,
4,
GLX_ALPHA_SIZE,
Params.WithAlphaChannel ? 1 : 0,
GLX_DEPTH_SIZE,
Params.ZBufferBits, // 10,11
GLX_DOUBLEBUFFER,
Params.Doublebuffer ? True : False,
GLX_STENCIL_SIZE,
Params.Stencilbuffer ? 1 : 0,
#if defined(GLX_VERSION_1_4) && defined(GLX_SAMPLE_BUFFERS) // we need to check the extension string!
GLX_SAMPLE_BUFFERS,
1,
GLX_SAMPLES,
Params.AntiAlias, // 18,19
#elif defined(GLX_ARB_multisample)
GLX_SAMPLE_BUFFERS_ARB,
1,
GLX_SAMPLES_ARB,
Params.AntiAlias, // 18,19
#elif defined(GLX_SGIS_multisample)
GLX_SAMPLE_BUFFERS_SGIS,
1,
GLX_SAMPLES_SGIS,
Params.AntiAlias, // 18,19
#endif
GLX_STEREO,
Params.Stereobuffer ? True : False,
None
};
GLXFBConfig *configList = 0;
int nitems = 0;
if (Params.AntiAlias < 2) {
visualAttrBuffer[17] = 0;
visualAttrBuffer[19] = 0;
}
// first round with unchanged values
{
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
if (!configList && Params.AntiAlias) {
while (!configList && (visualAttrBuffer[19] > 1)) {
visualAttrBuffer[19] -= 1;
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
}
if (!configList) {
visualAttrBuffer[17] = 0;
visualAttrBuffer[19] = 0;
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
if (configList) {
os::Printer::log("No FSAA available.", ELL_WARNING);
Params.AntiAlias = 0;
} else {
// reenable multisampling
visualAttrBuffer[17] = 1;
visualAttrBuffer[19] = Params.AntiAlias;
}
}
}
}
// Next try with flipped stencil buffer value
// If the first round was with stencil flag it's now without
// Other way round also makes sense because some configs
// only have depth buffer combined with stencil buffer
if (!configList) {
if (Params.Stencilbuffer)
os::Printer::log("No stencilbuffer available, disabling stencil shadows.", ELL_WARNING);
Params.Stencilbuffer = !Params.Stencilbuffer;
visualAttrBuffer[15] = Params.Stencilbuffer ? 1 : 0;
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
if (!configList && Params.AntiAlias) {
while (!configList && (visualAttrBuffer[19] > 1)) {
visualAttrBuffer[19] -= 1;
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
}
if (!configList) {
visualAttrBuffer[17] = 0;
visualAttrBuffer[19] = 0;
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
if (configList) {
os::Printer::log("No FSAA available.", ELL_WARNING);
Params.AntiAlias = 0;
} else {
// reenable multisampling
visualAttrBuffer[17] = 1;
visualAttrBuffer[19] = Params.AntiAlias;
}
}
}
}
// Next try without double buffer
if (!configList && Params.Doublebuffer) {
os::Printer::log("No doublebuffering available.", ELL_WARNING);
Params.Doublebuffer = false;
visualAttrBuffer[13] = GLX_DONT_CARE;
Params.Stencilbuffer = false;
visualAttrBuffer[15] = 0;
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
if (!configList && Params.AntiAlias) {
while (!configList && (visualAttrBuffer[19] > 1)) {
visualAttrBuffer[19] -= 1;
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
}
if (!configList) {
visualAttrBuffer[17] = 0;
visualAttrBuffer[19] = 0;
configList = glxChooseFBConfig(display, screennr, visualAttrBuffer, &nitems);
if (configList) {
os::Printer::log("No FSAA available.", ELL_WARNING);
Params.AntiAlias = 0;
} else {
// reenable multisampling
visualAttrBuffer[17] = 1;
visualAttrBuffer[19] = Params.AntiAlias;
}
}
}
}
if (configList) {
glxFBConfig = configList[0];
XFree(configList);
typedef XVisualInfo *(*PFNGLXGETVISUALFROMFBCONFIGPROC)(Display *dpy, GLXFBConfig config);
PFNGLXGETVISUALFROMFBCONFIGPROC glxGetVisualFromFBConfig = (PFNGLXGETVISUALFROMFBCONFIGPROC)glXGetProcAddress(reinterpret_cast<const GLubyte *>("glXGetVisualFromFBConfig"));
if (glxGetVisualFromFBConfig)
VisualInfo = glxGetVisualFromFBConfig(display, (GLXFBConfig)glxFBConfig);
}
} else
#endif
{
// attribute array for the draw buffer
int visualAttrBuffer[] =
{
GLX_RGBA, GLX_USE_GL,
GLX_RED_SIZE, 4,
GLX_GREEN_SIZE, 4,
GLX_BLUE_SIZE, 4,
GLX_ALPHA_SIZE, Params.WithAlphaChannel ? 1 : 0,
GLX_DEPTH_SIZE, Params.ZBufferBits,
GLX_STENCIL_SIZE, Params.Stencilbuffer ? 1 : 0, // 12,13
// The following attributes have no flags, but are
// either present or not. As a no-op we use
// GLX_USE_GL, which is silently ignored by glXChooseVisual
Params.Doublebuffer ? GLX_DOUBLEBUFFER : GLX_USE_GL, // 14
Params.Stereobuffer ? GLX_STEREO : GLX_USE_GL, // 15
None};
VisualInfo = glXChooseVisual(display, screennr, visualAttrBuffer);
if (!VisualInfo) {
if (Params.Stencilbuffer)
os::Printer::log("No stencilbuffer available, disabling.", ELL_WARNING);
Params.Stencilbuffer = !Params.Stencilbuffer;
visualAttrBuffer[13] = Params.Stencilbuffer ? 1 : 0;
VisualInfo = glXChooseVisual(display, screennr, visualAttrBuffer);
if (!VisualInfo && Params.Doublebuffer) {
os::Printer::log("No doublebuffering available.", ELL_WARNING);
Params.Doublebuffer = false;
visualAttrBuffer[14] = GLX_USE_GL;
VisualInfo = glXChooseVisual(display, screennr, visualAttrBuffer);
}
}
}
} else
os::Printer::log("No GLX support available. OpenGL driver will not work.", ELL_WARNING);
}
CGLXManager::~CGLXManager()
{
}
bool CGLXManager::initialize(const SIrrlichtCreationParameters &params, const SExposedVideoData &videodata)
{
// store params
Params = params;
// set display
CurrentContext.OpenGLLinux.X11Display = videodata.OpenGLLinux.X11Display;
// now get new window
CurrentContext.OpenGLLinux.X11Window = videodata.OpenGLLinux.X11Window;
if (!PrimaryContext.OpenGLLinux.X11Window) {
PrimaryContext.OpenGLLinux.X11Window = CurrentContext.OpenGLLinux.X11Window;
}
return true;
}
void CGLXManager::terminate()
{
memset((void *)&CurrentContext, 0, sizeof(CurrentContext));
}
bool CGLXManager::generateSurface()
{
if (glxFBConfig) {
GlxWin = glXCreateWindow((Display *)CurrentContext.OpenGLLinux.X11Display, (GLXFBConfig)glxFBConfig, CurrentContext.OpenGLLinux.X11Window, NULL);
if (!GlxWin) {
os::Printer::log("Could not create GLX window.", ELL_WARNING);
return false;
}
CurrentContext.OpenGLLinux.GLXWindow = GlxWin;
} else {
CurrentContext.OpenGLLinux.GLXWindow = CurrentContext.OpenGLLinux.X11Window;
}
return true;
}
void CGLXManager::destroySurface()
{
if (GlxWin)
glXDestroyWindow((Display *)CurrentContext.OpenGLLinux.X11Display, GlxWin);
}
#if defined(GLX_ARB_create_context)
static int IrrIgnoreError(Display *display, XErrorEvent *event)
{
char msg[256];
XGetErrorText(display, event->error_code, msg, 256);
os::Printer::log("Ignoring an X error", msg, ELL_DEBUG);
return 0;
}
#endif
bool CGLXManager::generateContext()
{
GLXContext context = 0;
if (glxFBConfig) {
if (GlxWin) {
#if defined(GLX_ARB_create_context)
PFNGLXCREATECONTEXTATTRIBSARBPROC glxCreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddress(reinterpret_cast<const GLubyte *>("glXCreateContextAttribsARB"));
if (glxCreateContextAttribsARB) {
os::Printer::log("GLX with GLX_ARB_create_context", ELL_DEBUG);
int contextAttrBuffer[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
GLX_CONTEXT_MINOR_VERSION_ARB, 0,
// GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
None};
XErrorHandler old = XSetErrorHandler(IrrIgnoreError);
context = glxCreateContextAttribsARB((Display *)CurrentContext.OpenGLLinux.X11Display, (GLXFBConfig)glxFBConfig, NULL, True, contextAttrBuffer);
XSetErrorHandler(old);
// transparently fall back to legacy call
}
if (!context)
#endif
{
// create glx context
context = glXCreateNewContext((Display *)CurrentContext.OpenGLLinux.X11Display, (GLXFBConfig)glxFBConfig, GLX_RGBA_TYPE, NULL, True);
if (!context) {
os::Printer::log("Could not create GLX rendering context.", ELL_WARNING);
return false;
}
}
} else {
os::Printer::log("GLX window was not properly created.", ELL_WARNING);
return false;
}
} else {
context = glXCreateContext((Display *)CurrentContext.OpenGLLinux.X11Display, VisualInfo, NULL, True);
if (!context) {
os::Printer::log("Could not create GLX rendering context.", ELL_WARNING);
return false;
}
}
CurrentContext.OpenGLLinux.X11Context = context;
return true;
}
const SExposedVideoData &CGLXManager::getContext() const
{
return CurrentContext;
}
bool CGLXManager::activateContext(const SExposedVideoData &videoData, bool restorePrimaryOnZero)
{
// TODO: handle restorePrimaryOnZero
if (videoData.OpenGLLinux.X11Window) {
if (videoData.OpenGLLinux.X11Display && videoData.OpenGLLinux.X11Context) {
if (!glXMakeCurrent((Display *)videoData.OpenGLLinux.X11Display, videoData.OpenGLLinux.GLXWindow, (GLXContext)videoData.OpenGLLinux.X11Context)) {
os::Printer::log("Context activation failed.");
return false;
} else {
CurrentContext.OpenGLLinux.GLXWindow = videoData.OpenGLLinux.GLXWindow;
CurrentContext.OpenGLLinux.X11Window = videoData.OpenGLLinux.X11Window;
CurrentContext.OpenGLLinux.X11Display = videoData.OpenGLLinux.X11Display;
}
} else {
// in case we only got a window ID, try with the existing values for display and context
if (!glXMakeCurrent((Display *)PrimaryContext.OpenGLLinux.X11Display, videoData.OpenGLLinux.GLXWindow, (GLXContext)PrimaryContext.OpenGLLinux.X11Context)) {
os::Printer::log("Context activation failed.");
return false;
} else {
CurrentContext.OpenGLLinux.GLXWindow = videoData.OpenGLLinux.GLXWindow;
CurrentContext.OpenGLLinux.X11Window = videoData.OpenGLLinux.X11Window;
CurrentContext.OpenGLLinux.X11Display = PrimaryContext.OpenGLLinux.X11Display;
}
}
} else if (!restorePrimaryOnZero && !videoData.OpenGLLinux.X11Window && !videoData.OpenGLLinux.X11Display) {
if (!glXMakeCurrent((Display *)PrimaryContext.OpenGLLinux.X11Display, None, NULL)) {
os::Printer::log("Render Context reset failed.");
return false;
}
CurrentContext.OpenGLLinux.X11Window = 0;
CurrentContext.OpenGLLinux.X11Display = 0;
}
// set back to main context
else if (CurrentContext.OpenGLLinux.X11Display != PrimaryContext.OpenGLLinux.X11Display) {
if (!glXMakeCurrent((Display *)PrimaryContext.OpenGLLinux.X11Display, PrimaryContext.OpenGLLinux.X11Window, (GLXContext)PrimaryContext.OpenGLLinux.X11Context)) {
os::Printer::log("Context activation failed.");
return false;
} else {
CurrentContext = PrimaryContext;
}
}
return true;
}
void CGLXManager::destroyContext()
{
if (CurrentContext.OpenGLLinux.X11Context) {
if (GlxWin) {
if (!glXMakeContextCurrent((Display *)CurrentContext.OpenGLLinux.X11Display, None, None, NULL))
os::Printer::log("Could not release glx context.", ELL_WARNING);
} else {
if (!glXMakeCurrent((Display *)CurrentContext.OpenGLLinux.X11Display, None, NULL))
os::Printer::log("Could not release glx context.", ELL_WARNING);
}
glXDestroyContext((Display *)CurrentContext.OpenGLLinux.X11Display, (GLXContext)CurrentContext.OpenGLLinux.X11Context);
}
}
void *CGLXManager::getProcAddress(const std::string &procName)
{
return (void *)glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(procName.c_str()));
}
bool CGLXManager::swapBuffers()
{
glXSwapBuffers((Display *)CurrentContext.OpenGLLinux.X11Display, CurrentContext.OpenGLLinux.GLXWindow);
return true;
}
}
}
#endif