Merge pull request #37317 from akien-mga/display-server-rebased

Separate DisplayServer from OS and add multiple windows support

1 files changed, 265 insertions, 0 deletions

diff --git a/platform/linuxbsd/context_gl_x11.cpp b/platform/linuxbsd/context_gl_x11.cpp
new file mode 100644
index 0000000000..5442af3bef
--- /dev/null
+++ b/platform/linuxbsd/context_gl_x11.cpp
@@ -0,0 +1,265 @@
+/*************************************************************************/
+/*  context_gl_x11.cpp                                                   */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 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;
+			}
+		}
+		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 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;
+	}
+
+	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, "Godot Engine");
+
+	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