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/* Copyright 2015-2018 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#include <memory>
#include <iomanip>
#include "PlatformDefinitions.h"
#include "NativeAppBase.h"
#include "StringTools.h"
#include "Timer.h"
#include "Errors.h"
#ifndef GLX_CONTEXT_MAJOR_VERSION_ARB
# define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091
#endif
#ifndef GLX_CONTEXT_MINOR_VERSION_ARB
# define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092
#endif
#ifndef GLX_CONTEXT_FLAGS_ARB
# define GLX_CONTEXT_FLAGS_ARB 0x2094
#endif
#ifndef GLX_CONTEXT_DEBUG_BIT_ARB
# define GLX_CONTEXT_DEBUG_BIT_ARB 0x0001
#endif
typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, int, const int*);
using namespace Diligent;
int main (int argc, char ** argv)
{
std::unique_ptr<NativeAppBase> TheApp(CreateApplication());
Display *display = XOpenDisplay(0);
static int visual_attribs[] =
{
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_DOUBLEBUFFER, true,
// The largest available total RGBA color buffer size (sum of GLX_RED_SIZE,
// GLX_GREEN_SIZE, GLX_BLUE_SIZE, and GLX_ALPHA_SIZE) of at least the minimum
// size specified for each color component is preferred.
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
// The largest available depth buffer of at least GLX_DEPTH_SIZE size is preferred
GLX_DEPTH_SIZE, 24,
//GLX_SAMPLE_BUFFERS, 1,
GLX_SAMPLES, 1,
None
};
int fbcount = 0;
GLXFBConfig *fbc = glXChooseFBConfig(display, DefaultScreen(display), visual_attribs, &fbcount);
if (!fbc)
{
LOG_ERROR_MESSAGE("Failed to retrieve a framebuffer config");
return -1;
}
XVisualInfo *vi = glXGetVisualFromFBConfig(display, fbc[0]);
XSetWindowAttributes swa;
swa.colormap = XCreateColormap(display, RootWindow(display, vi->screen), vi->visual, AllocNone);
swa.border_pixel = 0;
swa.event_mask =
StructureNotifyMask |
ExposureMask |
KeyPressMask |
KeyReleaseMask |
ButtonPressMask |
ButtonReleaseMask |
PointerMotionMask;
Window win = XCreateWindow(display, RootWindow(display, vi->screen), 0, 0, 1024, 768, 0, vi->depth, InputOutput, vi->visual, CWBorderPixel|CWColormap|CWEventMask, &swa);
if (!win)
{
LOG_ERROR_MESSAGE("Failed to create window.");
return -1;
}
XMapWindow(display, win);
glXCreateContextAttribsARBProc glXCreateContextAttribsARB = nullptr;
{
// Create an oldstyle context first, to get the correct function pointer for glXCreateContextAttribsARB
GLXContext ctx_old = glXCreateContext(display, vi, 0, GL_TRUE);
glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");
glXMakeCurrent(display, None, NULL);
glXDestroyContext(display, ctx_old);
}
if (glXCreateContextAttribsARB == nullptr)
{
LOG_ERROR("glXCreateContextAttribsARB entry point not found. Aborting.");
return -1;
}
int Flags = GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
#ifdef _DEBUG
Flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
#endif
int major_version = 4;
int minor_version = 3;
static int context_attribs[] =
{
GLX_CONTEXT_MAJOR_VERSION_ARB, major_version,
GLX_CONTEXT_MINOR_VERSION_ARB, minor_version,
GLX_CONTEXT_FLAGS_ARB, Flags,
None
};
constexpr int True = 1;
GLXContext ctx = glXCreateContextAttribsARB(display, fbc[0], NULL, True, context_attribs);
if (!ctx)
{
LOG_ERROR("Failed to create GL context.");
return -1;
}
XFree(fbc);
glXMakeCurrent(display, win, ctx);
TheApp->OnGLContextCreated(display, win);
std::string Title = TheApp->GetAppTitle();
Timer timer;
auto PrevTime = timer.GetElapsedTime();
double filteredFrameTime = 0.0;
while (true)
{
bool EscPressed = false;
XEvent xev;
// Handle all events in the queue
while(XCheckMaskEvent(display, 0xFFFFFFFF, &xev))
{
TheApp->HandleXEvent(&xev);
switch(xev.type)
{
case KeyPress:
{
KeySym keysym;
char buffer[80];
int num_char = XLookupString((XKeyEvent *)&xev, buffer, _countof(buffer), &keysym, 0);
EscPressed = (keysym==XK_Escape);
}
case ConfigureNotify:
{
XConfigureEvent &xce = reinterpret_cast<XConfigureEvent &>(xev);
if(xce.width != 0 && xce.height != 0)
TheApp->WindowResize(xce.width, xce.height);
break;
}
}
}
if(EscPressed)
break;
// Render the scene
auto CurrTime = timer.GetElapsedTime();
auto ElapsedTime = CurrTime - PrevTime;
PrevTime = CurrTime;
TheApp->Update(CurrTime, ElapsedTime);
TheApp->Render();
TheApp->Present();
double filterScale = 0.2;
filteredFrameTime = filteredFrameTime * (1.0 - filterScale) + filterScale * ElapsedTime;
std::stringstream fpsCounterSS;
fpsCounterSS << " - " << std::fixed << std::setprecision(1) << filteredFrameTime * 1000;
fpsCounterSS << " ms (" << 1.0 / filteredFrameTime << " fps)";
XStoreName(display, win, (Title + fpsCounterSS.str()).c_str());
}
TheApp.reset();
ctx = glXGetCurrentContext();
glXMakeCurrent(display, None, NULL);
glXDestroyContext(display, ctx);
XDestroyWindow(display, win);
XCloseDisplay(display);
}
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