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/*
* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.glass.ui.monocle;
/** AcceleratedScreen provides methods necessary to instantiate and intitialize
* a hardware-accelerated screen for rendering.
*/
public class AcceleratedScreen {
private static long glesLibraryHandle;
private static long eglLibraryHandle;
private static boolean initialized = false;
private long eglSurface;
private long eglContext;
private long eglDisplay;
private long nativeWindow;
protected static final LinuxSystem ls = LinuxSystem.getLinuxSystem();
private EGL egl;
long eglConfigs[] = {0};
/** Returns a platform-specific native display handle suitable for use with
* eglGetDisplay.
*/
protected long platformGetNativeDisplay() {
return 0L;
}
/** Returns a platform-specific native window handle suitable for use with
* eglCreateWindowSurface.
*/
protected long platformGetNativeWindow() {
return 0L;
}
/**
* Perform basic egl intialization - open the display, create the drawing
* surface, and create a GL context to that drawing surface.
* @param attributes - attributes to be used for filtering the EGL
* configurations to choose from
* @throws GLException
* @throws UnsatisfiedLinkError
*/
AcceleratedScreen(int[] attributes) throws GLException, UnsatisfiedLinkError {
egl = EGL.getEGL();
initPlatformLibraries();
int major[] = {0}, minor[]={0};
long nativeDisplay = platformGetNativeDisplay();
long nativeWindow = platformGetNativeWindow();
if (nativeDisplay == -1l) { // error condition
throw new GLException(0, "Could not get native display");
}
if (nativeWindow == -1l) { // error condition
throw new GLException(0, "Could not get native window");
}
eglDisplay =
egl.eglGetDisplay(nativeDisplay);
if (eglDisplay == EGL.EGL_NO_DISPLAY) {
throw new GLException(egl.eglGetError(),
"Could not get EGL display");
}
if (!egl.eglInitialize(eglDisplay, major, minor)) {
throw new GLException(egl.eglGetError(),
"Error initializing EGL");
}
if (!egl.eglBindAPI(EGL.EGL_OPENGL_ES_API)) {
throw new GLException(egl.eglGetError(),
"Error binding OPENGL API");
}
int configCount[] = {0};
if (!egl.eglChooseConfig(eglDisplay, attributes, eglConfigs,
1, configCount)) {
throw new GLException(egl.eglGetError(),
"Error choosing EGL config");
}
eglSurface =
egl.eglCreateWindowSurface(eglDisplay, eglConfigs[0],
nativeWindow, null);
if (eglSurface == EGL.EGL_NO_SURFACE) {
throw new GLException(egl.eglGetError(),
"Could not get EGL surface");
}
int emptyAttrArray [] = {};
eglContext = egl.eglCreateContext(eglDisplay, eglConfigs[0],
0, emptyAttrArray);
if (eglContext == EGL.EGL_NO_CONTEXT) {
throw new GLException(egl.eglGetError(),
"Could not get EGL context");
}
}
private void createSurface() {
nativeWindow = platformGetNativeWindow();
eglSurface = egl._eglCreateWindowSurface(eglDisplay, eglConfigs[0],
nativeWindow, null);
}
/** Make the EGL drawing surface current or not
*
* @param flag
*/
public void enableRendering(boolean flag) {
if (flag) {
egl.eglMakeCurrent(eglDisplay, eglSurface, eglSurface,
eglContext);
} else {
egl.eglMakeCurrent(eglDisplay, 0, 0, eglContext);
}
}
/** Load any native libraries needed to instantiate and initialize the
* native drawing surface and rendering context
* @return success or failure
* @throws UnsatisfiedLinkError
*/
boolean initPlatformLibraries() throws UnsatisfiedLinkError{
if (!initialized) {
glesLibraryHandle = ls.dlopen("libGLESv2.so",
LinuxSystem.RTLD_LAZY | LinuxSystem.RTLD_GLOBAL);
if (glesLibraryHandle == 0l) {
throw new UnsatisfiedLinkError("Error loading libGLESv2.so");
}
eglLibraryHandle = ls.dlopen("libEGL.so",
LinuxSystem.RTLD_LAZY | LinuxSystem.RTLD_GLOBAL);
if (eglLibraryHandle == 0l) {
throw new UnsatisfiedLinkError("Error loading libEGL.so");
}
initialized = true;
}
return true;
}
/** Return the GL library handle - for use in looking up native symbols
*
*/
public long getGLHandle() {
return glesLibraryHandle;
}
/** Return the EGL library handle - for use in looking up native symbols
*
*/
protected long getEGLHandle() { return eglLibraryHandle; }
/** Copy the contents of the GL backbuffer to the screen
*
* @return success or failure
*/
public boolean swapBuffers() {
boolean result = false;
synchronized(NativeScreen.framebufferSwapLock) {
result = egl.eglSwapBuffers(eglDisplay, eglSurface);
// TODO this shouldn't happen. In case the surface is invalid, we need to have recreated it before this method is called
if (!result) {
createSurface();
result = egl.eglSwapBuffers(eglDisplay, eglSurface);
}
}
return result;
}
}
