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First GLX implementation

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Former-commit-id: 0f41eb0bd949899fce740879604f14a44f532d8a
This commit is contained in:
Youri Hubaut
2015-09-19 17:22:25 +02:00
parent e8cc3e357e
commit 829b356ae2
9 changed files with 395 additions and 29 deletions
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297
src/Nazara/Renderer/GLX/ContextImpl.cpp Normal file
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// Copyright (C) 2015 Jérôme Leclercq
// This file is part of the "Nazara Engine - Renderer module"
// For conditions of distribution and use, see copyright notice in Config.hpp
// Code inspiré de NeHe (Lesson1) et de la SFML par Laurent Gomila
#include <Nazara/Renderer/GLX/ContextImpl.hpp>
#include <Nazara/Core/CallOnExit.hpp>
#include <Nazara/Core/Error.hpp>
#include <Nazara/Renderer/Context.hpp>
#include <Nazara/Renderer/Debug.hpp>
using namespace GLX;
namespace
{
Display* m_display;
int m_sharedDisplay = 0;
bool ctxErrorOccurred = false;
int ctxErrorHandler( Display* /*dpy*/, XErrorEvent* /*ev*/ )
{
ctxErrorOccurred = true;
return 0;
}
}
NzContextImpl::NzContextImpl() :
m_colormap(0),
m_context(0),
m_window(0),
m_ownsWindow(false)
{
if (m_sharedDisplay == 0)
m_display = XOpenDisplay(nullptr);
++m_sharedDisplay;
}
NzContextImpl::~NzContextImpl()
{
Destroy();
if (--m_sharedDisplay == 0)
{
XCloseDisplay(m_display);
m_display = nullptr;
}
}
bool NzContextImpl::Activate()
{
return glXMakeCurrent(m_display, m_window, m_context) == true;
}
bool NzContextImpl::Create(NzContextParameters& parameters)
{
// En cas d'exception, la ressource sera quand même libérée
NzCallOnExit onExit([this] ()
{
Destroy();
});
// Get a matching FB config
static int visual_attribs[] =
{
GLX_X_RENDERABLE, True,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
GLX_BUFFER_SIZE, parameters.bitsPerPixel,
GLX_ALPHA_SIZE, (parameters.bitsPerPixel == 32) ? 8 : 0,
GLX_DEPTH_SIZE, parameters.depthBits,
GLX_STENCIL_SIZE, parameters.stencilBits,
GLX_DOUBLEBUFFER, True,
GLX_SAMPLE_BUFFERS, (parameters.antialiasingLevel > 0) ? True : False,
GLX_SAMPLES, parameters.antialiasingLevel,
None
};
int glx_major = 0;
int glx_minor = 0;
// FBConfigs were added in GLX version 1.3.
if (!glXQueryVersion(m_display, &glx_major, &glx_minor) || ((glx_major == 1) && (glx_minor < 3)) || (glx_major < 1))
{
NazaraError("Invalid GLX version, version > 1.3 is required.");
return false;
}
int fbcount;
GLXFBConfig* fbc = glXChooseFBConfig(m_display, XDefaultScreen(m_display), visual_attribs, &fbcount);
if (!fbc)
{
NazaraError("Failed to retrieve a framebuffer config");
return false;
}
// Pick the FB config/visual with the most samples per pixel
int best_fbc = -1;
int worst_fbc = -1;
int best_num_samp = -1;
int worst_num_samp = 999;
for (int i = 0; i < fbcount; ++i)
{
XVisualInfo* vi = glXGetVisualFromFBConfig(m_display, fbc[i]);
if (vi)
{
int samp_buf = 0, samples = 0;
glXGetFBConfigAttrib(m_display, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf);
glXGetFBConfigAttrib(m_display, fbc[i], GLX_SAMPLES , &samples );
if ((best_fbc < 0) || (samp_buf && (samples > best_num_samp)))
{
best_fbc = i;
best_num_samp = samples;
}
if ((worst_fbc < 0) || !samp_buf || (samples < worst_num_samp))
{
worst_fbc = i;
worst_num_samp = samples;
}
}
XFree(vi);
}
GLXFBConfig bestFbc = fbc[best_fbc];
// Be sure to free the FBConfig list allocated by glXChooseFBConfig()
XFree(fbc);
// Get a visual
XVisualInfo* vi = glXGetVisualFromFBConfig(m_display, bestFbc);
if (!vi)
{
NazaraError("Failed to get best VisualInfo");
return false;
}
// If context is shared by multiple windows
if (parameters.window)
{
m_window = parameters.window;
m_ownsWindow = false;
}
else
{
XSetWindowAttributes swa;
swa.colormap = m_colormap = XCreateColormap(
m_display,
XRootWindow(
m_display,
vi->screen),
vi->visual,
AllocNone
);
swa.background_pixmap = None;
swa.border_pixel = 0;
swa.event_mask = StructureNotifyMask;
if (!m_colormap)
{
NazaraError("Failed to create colormap for context");
return false;
}
m_window = XCreateWindow(
m_display,
XRootWindow(
m_display,
vi->screen),
0, 0, // X, Y
1, 1, // W H
0,
vi->depth,
InputOutput,
vi->visual,
CWBorderPixel | CWColormap | CWEventMask,
&swa
);
m_ownsWindow = true;
}
if (!m_window)
{
NazaraError("Failed to create window");
return false;
}
// Done with the visual info data
XFree(vi);
// Install an X error handler so the application won't exit if GL 3.0
// context allocation fails.
//
// Note this error handler is global. All display connections in all threads
// of a process use the same error handler, so be sure to guard against other
// threads issuing X commands while this code is running.
ctxErrorOccurred = false;
int (*oldHandler)(Display*, XErrorEvent*) =
XSetErrorHandler(&ctxErrorHandler);
// Check for the GLX_ARB_create_context extension string and the function.
// If either is not present, use GLX 1.3 context creation method.
if (!glXCreateContextAttribs)
{
NazaraWarning("glXCreateContextAttribs() not found. Using old-style GLX context");
m_context = glXCreateNewContext(m_display, bestFbc, GLX_RGBA_TYPE, parameters.shared ? parameters.shareContext->m_impl->m_context : 0, True);
}
// If it does, try to get a GL 3.0 context!
else
{
int profile = parameters.compatibilityProfile ? GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB : GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
int debug = parameters.debugMode ? GLX_CONTEXT_DEBUG_BIT_ARB : 0;
int major = 3;//parameters.majorVersion;
int minor = 3;//parameters.minorVersion;
int context_attribs[] =
{
GLX_CONTEXT_MAJOR_VERSION_ARB, major,
GLX_CONTEXT_MINOR_VERSION_ARB, minor,
GLX_CONTEXT_PROFILE_MASK_ARB, profile,
GLX_CONTEXT_FLAGS_ARB, debug,
None, None
};
m_context = glXCreateContextAttribs(
m_display,
bestFbc,
parameters.shared ? parameters.shareContext->m_impl->m_context : 0,
True,
context_attribs
);
}
// Sync to ensure any errors generated are processed.
XSync(m_display, False);
XSetErrorHandler(oldHandler);
if (ctxErrorOccurred || !m_context)
{
NazaraError("Failed to create context, check the version");
return false;
}
onExit.Reset();
return true;
}
void NzContextImpl::Destroy()
{
// Destroy the context
if (m_context)
{
if (glXGetCurrentContext() == m_context)
glXMakeCurrent(m_display, None, nullptr);
glXDestroyContext(m_display, m_context);
m_context = nullptr;
}
// Destroy the window if we own it
if (m_ownsWindow && m_window)
{
XFreeColormap(m_display, m_colormap);
XDestroyWindow(m_display, m_window);
m_ownsWindow = false;
m_window = 0;
XFlush(m_display);
}
}
void NzContextImpl::EnableVerticalSync(bool enabled)
{
if (glXSwapIntervalEXT)
glXSwapIntervalEXT(m_display, glXGetCurrentDrawable(), enabled ? 1 : 0);
else if (NzglXSwapIntervalMESA)
NzglXSwapIntervalMESA(enabled ? 1 : 0);
else if (glXSwapIntervalSGI)
glXSwapIntervalSGI(enabled ? 1 : 0);
else
NazaraError("Vertical sync not supported");
}
void NzContextImpl::SwapBuffers()
{
if (m_window)
glXSwapBuffers(m_display, m_window);
}
bool NzContextImpl::Desactivate()
{
return glXMakeCurrent(m_display, None, nullptr) == true;
}

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src/Nazara/Renderer/GLX/ContextImpl.hpp Normal file
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// Copyright (C) 2015 Jérôme Leclercq
// This file is part of the "Nazara Engine".
// For conditions of distribution and use, see copyright notice in Config.hpp
#pragma once
#ifndef NAZARA_CONTEXTIMPL_HPP
#define NAZARA_CONTEXTIMPL_HPP
#include <Nazara/Renderer/OpenGL.hpp>
class NzContextParameters;
class NzContextImpl
{
public:
NzContextImpl();
~NzContextImpl();
bool Activate();
bool Create(NzContextParameters& parameters);
void Destroy();
void EnableVerticalSync(bool enabled);
void SwapBuffers();
static bool Desactivate();
private:
GLX::Colormap m_colormap;
GLX::GLXContext m_context;
GLX::Window m_window;
bool m_ownsWindow;
};
#endif // NAZARA_CONTEXTIMPL_HPP