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godot/platform/x11/context_gl_x11.cpp
Hein-Pieter van Braam 08f452d1a9 Fall back to GLES2 if GLES3 is not working 
This adds a static is_viable() method to all rasterizers which has to be
called before initializing the rasterizer. This allows us to check what
rasterizer to use in OS::initialize together with the GL context
initialization.

This commit also adds a new project setting
"rendering/quality/driver/driver_fallback" which allows the creator of a
project to specify whether or not fallback to GLES2 is allowed. This
setting is ignored for the editor so the editor will always open even if
the project itself cannot run. This will hopefully reduce confusion for
users downloading projects from the internet.

We also no longer crash when GLES3 is not functioning on a platform.

This fixes #15324
2018-08-26 16:40:46 +02:00

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/*************************************************************************/
/* context_gl_x11.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* 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;
};
void ContextGL_X11::release_current() {
glXMakeCurrent(x11_display, None, NULL);
}
void ContextGL_X11::make_current() {
glXMakeCurrent(x11_display, x11_window, p->glx_context);
}
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 *)"Godot_Engine";
classHint->res_class = (char *)"Godot";
}
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 = 0;
XVisualInfo *vi = NULL;
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 = NULL;
continue;
}
fbconfig = fbc[i];
if (pict_format->direct.alphaMask > 0) {
break;
}
}
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];
}
int (*oldHandler)(Display *, XErrorEvent *) = XSetErrorHandler(&ctxErrorHandler);
switch (context_type) {
case OLDSTYLE: {
p->glx_context = glXCreateContext(x11_display, vi, 0, 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, 0, 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, NULL, true, context_attribs);
ERR_FAIL_COND_V(ctxErrorOccurred || !p->glx_context, ERR_UNCONFIGURED);
} 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);
ERR_FAIL_COND_V(!x11_window, ERR_UNCONFIGURED);
set_class_hint(x11_display, x11_window);
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::set_use_vsync(bool p_use) {
static bool setup = false;
static PFNGLXSWAPINTERVALEXTPROC glXSwapIntervalEXT = NULL;
static PFNGLXSWAPINTERVALSGIPROC glXSwapIntervalMESA = NULL;
static PFNGLXSWAPINTERVALSGIPROC glXSwapIntervalSGI = NULL;
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 = 0;
use_vsync = false;
}
ContextGL_X11::~ContextGL_X11() {
release_current();
glXDestroyContext(x11_display, p->glx_context);
memdelete(p);
}
#endif
#endif
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