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pandemonium_engine/platform/x11/context_gl_x11.cpp

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/*************************************************************************/
/* context_gl_x11.cpp */
/*************************************************************************/
/* This file is part of: */
/* PANDEMONIUM ENGINE */
/* https://github.com/Relintai/pandemonium_engine */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* 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.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "context_gl_x11.h"
#ifdef X11_ENABLED
#if defined(OPENGL_ENABLED)
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define GLX_GLXEXT_PROTOTYPES
#include <GL/glx.h>
#include <GL/glxext.h>
#define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092
typedef GLXContext (*GLXCREATECONTEXTATTRIBSARBPROC)(Display *, GLXFBConfig, GLXContext, Bool, const int *);
struct ContextGL_X11_Private {
::GLXContext glx_context;
::GLXContext glx_context_offscreen;
};
void ContextGL_X11::release_current() {
glXMakeCurrent(x11_display, None, nullptr);
}
void ContextGL_X11::make_current() {
glXMakeCurrent(x11_display, x11_window, p->glx_context);
}
bool ContextGL_X11::is_offscreen_available() const {
return p->glx_context_offscreen;
}
void ContextGL_X11::make_offscreen_current() {
glXMakeCurrent(x11_display, x11_window, p->glx_context_offscreen);
}
void ContextGL_X11::release_offscreen_current() {
glXMakeCurrent(x11_display, None, NULL);
}
void ContextGL_X11::swap_buffers() {
glXSwapBuffers(x11_display, x11_window);
}
static bool ctxErrorOccurred = false;
static int ctxErrorHandler(Display *dpy, XErrorEvent *ev) {
ctxErrorOccurred = true;
return 0;
}
static void set_class_hint(Display *p_display, Window p_window) {
XClassHint *classHint;
/* set the name and class hints for the window manager to use */
classHint = XAllocClassHint();
if (classHint) {
classHint->res_name = (char *)"Pandemonium_Engine";
classHint->res_class = (char *)"Pandemonium";
}
XSetClassHint(p_display, p_window, classHint);
XFree(classHint);
}
Error ContextGL_X11::initialize() {
//const char *extensions = glXQueryExtensionsString(x11_display, DefaultScreen(x11_display));
GLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB = (GLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddress((const GLubyte *)"glXCreateContextAttribsARB");
ERR_FAIL_COND_V(!glXCreateContextAttribsARB, ERR_UNCONFIGURED);
static int visual_attribs[] = {
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_DOUBLEBUFFER, true,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DEPTH_SIZE, 24,
None
};
static int visual_attribs_layered[] = {
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_DOUBLEBUFFER, true,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
GLX_DEPTH_SIZE, 24,
None
};
int fbcount;
GLXFBConfig fbconfig = nullptr;
XVisualInfo *vi = nullptr;
XSetWindowAttributes swa;
swa.event_mask = StructureNotifyMask;
swa.border_pixel = 0;
unsigned long valuemask = CWBorderPixel | CWColormap | CWEventMask;
if (OS::get_singleton()->is_layered_allowed()) {
GLXFBConfig *fbc = glXChooseFBConfig(x11_display, DefaultScreen(x11_display), visual_attribs_layered, &fbcount);
ERR_FAIL_COND_V(!fbc, ERR_UNCONFIGURED);
for (int i = 0; i < fbcount; i++) {
vi = (XVisualInfo *)glXGetVisualFromFBConfig(x11_display, fbc[i]);
if (!vi) {
continue;
}
XRenderPictFormat *pict_format = XRenderFindVisualFormat(x11_display, vi->visual);
if (!pict_format) {
XFree(vi);
vi = nullptr;
continue;
}
fbconfig = fbc[i];
if (pict_format->direct.alphaMask > 0) {
break;
}
}
XFree(fbc);
ERR_FAIL_COND_V(!fbconfig, ERR_UNCONFIGURED);
swa.background_pixmap = None;
swa.background_pixel = 0;
swa.border_pixmap = None;
valuemask |= CWBackPixel;
} else {
GLXFBConfig *fbc = glXChooseFBConfig(x11_display, DefaultScreen(x11_display), visual_attribs, &fbcount);
ERR_FAIL_COND_V(!fbc, ERR_UNCONFIGURED);
vi = glXGetVisualFromFBConfig(x11_display, fbc[0]);
fbconfig = fbc[0];
XFree(fbc);
}
int (*oldHandler)(Display *, XErrorEvent *) = XSetErrorHandler(&ctxErrorHandler);
switch (context_type) {
case OLDSTYLE: {
p->glx_context = glXCreateContext(x11_display, vi, nullptr, GL_TRUE);
ERR_FAIL_COND_V(!p->glx_context, ERR_UNCONFIGURED);
} break;
case GLES_2_0_COMPATIBLE: {
p->glx_context = glXCreateNewContext(x11_display, fbconfig, GLX_RGBA_TYPE, nullptr, true);
ERR_FAIL_COND_V(!p->glx_context, ERR_UNCONFIGURED);
} break;
case GLES_3_0_COMPATIBLE: {
static int context_attribs[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
GLX_CONTEXT_MINOR_VERSION_ARB, 3,
GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB /*|GLX_CONTEXT_DEBUG_BIT_ARB*/,
None
};
p->glx_context = glXCreateContextAttribsARB(x11_display, fbconfig, nullptr, true, context_attribs);
ERR_FAIL_COND_V(ctxErrorOccurred || !p->glx_context, ERR_UNCONFIGURED);
p->glx_context_offscreen = glXCreateContextAttribsARB(x11_display, fbconfig, nullptr, true, context_attribs);
} break;
}
swa.colormap = XCreateColormap(x11_display, RootWindow(x11_display, vi->screen), vi->visual, AllocNone);
x11_window = XCreateWindow(x11_display, RootWindow(x11_display, vi->screen), 0, 0, OS::get_singleton()->get_video_mode().width, OS::get_singleton()->get_video_mode().height, 0, vi->depth, InputOutput, vi->visual, valuemask, &swa);
XStoreName(x11_display, x11_window, "Pandemonium Engine");
ERR_FAIL_COND_V(!x11_window, ERR_UNCONFIGURED);
set_class_hint(x11_display, x11_window);
if (!OS::get_singleton()->is_no_window_mode_enabled()) {
XMapWindow(x11_display, x11_window);
}
XSync(x11_display, False);
XSetErrorHandler(oldHandler);
glXMakeCurrent(x11_display, x11_window, p->glx_context);
XFree(vi);
return OK;
}
int ContextGL_X11::get_window_width() {
XWindowAttributes xwa;
XGetWindowAttributes(x11_display, x11_window, &xwa);
return xwa.width;
}
int ContextGL_X11::get_window_height() {
XWindowAttributes xwa;
XGetWindowAttributes(x11_display, x11_window, &xwa);
return xwa.height;
}
void *ContextGL_X11::get_glx_context() {
if (p != nullptr) {
return p->glx_context;
} else {
return nullptr;
}
}
void ContextGL_X11::set_use_vsync(bool p_use) {
static bool setup = false;
static PFNGLXSWAPINTERVALEXTPROC glXSwapIntervalEXT = nullptr;
static PFNGLXSWAPINTERVALSGIPROC glXSwapIntervalMESA = nullptr;
static PFNGLXSWAPINTERVALSGIPROC glXSwapIntervalSGI = nullptr;
if (!setup) {
setup = true;
String extensions = glXQueryExtensionsString(x11_display, DefaultScreen(x11_display));
if (extensions.find("GLX_EXT_swap_control") != -1) {
glXSwapIntervalEXT = (PFNGLXSWAPINTERVALEXTPROC)glXGetProcAddressARB((const GLubyte *)"glXSwapIntervalEXT");
}
if (extensions.find("GLX_MESA_swap_control") != -1) {
glXSwapIntervalMESA = (PFNGLXSWAPINTERVALSGIPROC)glXGetProcAddressARB((const GLubyte *)"glXSwapIntervalMESA");
}
if (extensions.find("GLX_SGI_swap_control") != -1) {
glXSwapIntervalSGI = (PFNGLXSWAPINTERVALSGIPROC)glXGetProcAddressARB((const GLubyte *)"glXSwapIntervalSGI");
}
}
int val = p_use ? 1 : 0;
if (glXSwapIntervalMESA) {
glXSwapIntervalMESA(val);
} else if (glXSwapIntervalSGI) {
glXSwapIntervalSGI(val);
} else if (glXSwapIntervalEXT) {
GLXDrawable drawable = glXGetCurrentDrawable();
glXSwapIntervalEXT(x11_display, drawable, val);
} else {
return;
}
use_vsync = p_use;
}
bool ContextGL_X11::is_using_vsync() const {
return use_vsync;
}
ContextGL_X11::ContextGL_X11(::Display *p_x11_display, ::Window &p_x11_window, const OS::VideoMode &p_default_video_mode, ContextType p_context_type) :
x11_window(p_x11_window) {
default_video_mode = p_default_video_mode;
x11_display = p_x11_display;
context_type = p_context_type;
double_buffer = false;
direct_render = false;
glx_minor = glx_major = 0;
p = memnew(ContextGL_X11_Private);
p->glx_context = nullptr;
p->glx_context_offscreen = nullptr;
use_vsync = false;
}
ContextGL_X11::~ContextGL_X11() {
release_current();
glXDestroyContext(x11_display, p->glx_context);
if (p->glx_context_offscreen) {
glXDestroyContext(x11_display, p->glx_context_offscreen);
}
memdelete(p);
}
#endif
#endif
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