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[Android] Initial introduction of the EGLHelper utility class. Should simplify all interop with the EGL/GL APIs. Not hooked up yet. However it is entirely functional.
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Lioncash
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package org.dolphinemu.dolphinemu.utils;
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import javax.microedition.khronos.egl.EGL10;
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import javax.microedition.khronos.egl.EGLConfig;
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import javax.microedition.khronos.egl.EGLContext;
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import javax.microedition.khronos.egl.EGLDisplay;
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import javax.microedition.khronos.egl.EGLSurface;
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import javax.microedition.khronos.opengles.GL10;
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import android.util.Log;
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/**
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* Utility class that abstracts all the stuff about
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* EGL initialization out of the way if all that is
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* wanted is to query the underlying GL API for information.
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*/
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public final class EGLHelper
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{
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private final EGL10 mEGL;
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private final EGLDisplay mDisplay;
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private EGLConfig[] mEGLConfigs;
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private EGLContext mEGLContext;
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private EGLSurface mEGLSurface;
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private GL10 mGL;
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// GL support flags
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private boolean supportGL;
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private boolean supportGLES2;
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private boolean supportGLES3;
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// Renderable type bitmasks
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public static final int EGL_OPENGL_ES_BIT = 0x0001;
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public static final int EGL_OPENGL_ES2_BIT = 0x0004;
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public static final int EGL_OPENGL_BIT = 0x0008;
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public static final int EGL_OPENGL_ES3_BIT_KHR = 0x0040;
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/**
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* Constructor
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*
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* @param width Width of the underlying {@link EGLSurface}.
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* @param height Height of the underlying {@link EGLSurface}.
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* @param renderableType Bitmask indicating which types of client API contexts
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* the framebuffer config must support.
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*/
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public EGLHelper(int width, int height, int renderableType)
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{
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// Initialize handle to an EGL display.
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mEGL = (EGL10) EGLContext.getEGL();
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mDisplay = mEGL.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
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// If a display is present, initialize EGL.
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if (mDisplay != EGL10.EGL_NO_DISPLAY)
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{
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int[] version = new int[2];
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if (mEGL.eglInitialize(mDisplay, version))
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{
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// Detect supported GL APIs, initialize configs, etc.
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detect();
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// Create context and surface
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create(width, height, renderableType);
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}
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else
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{
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Log.e("EGLHelper", "Error initializing EGL.");
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}
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}
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else
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{
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Log.e("EGLHelper", "Error initializing EGL display.");
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}
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}
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/**
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* Releases all resources associated with this helper.
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* <p>
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* This should be called whenever this helper is no longer needed.
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*/
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public void closeHelper()
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{
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mEGL.eglTerminate(mDisplay);
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}
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/**
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* Gets information through EGL.<br/>
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* <p>
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* Index 0: Vendor <br/>
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* Index 1: Renderer <br/>
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* Index 2: Version <br/>
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* Index 3: Extensions <br/>
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*
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* @return information retrieved through EGL.
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*/
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public String[] getEGLInfo()
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{
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String[] info = {
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mGL.glGetString(GL10.GL_VENDOR),
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mGL.glGetString(GL10.GL_RENDERER),
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mGL.glGetString(GL10.GL_VERSION),
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mGL.glGetString(GL10.GL_EXTENSIONS),
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};
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return info;
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}
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/**
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* Whether or not this device supports OpenGL.
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*
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* @return true if this device supports OpenGL; false otherwise.
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*/
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public boolean supportsOpenGL()
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{
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return supportGL;
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}
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/**
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* Whether or not this device supports OpenGL ES 2.
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* <br/>
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* Note that if this returns true, then OpenGL ES 1 is also supported.
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*
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* @return true if this device supports OpenGL ES 2; false otherwise.
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*/
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public boolean supportsGLES2()
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{
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return supportGLES2;
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}
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/**
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* Whether or not this device supports OpenGL ES 3.
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* <br/>
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* Note that if this returns true, then OpenGL ES 1 and 2 are also supported.
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*
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* @return true if this device supports OpenGL ES 3; false otherwise.
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*/
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public boolean supportsGLES3()
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{
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return supportGLES3;
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}
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/**
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* Gets the underlying {@link EGL10} instance.
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*
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* @return the underlying {@link EGL10} instance.
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*/
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public EGL10 getEGL()
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{
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return mEGL;
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}
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/**
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* Gets the underlying {@link GL10} instance.
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*
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* @return the underlying {@link GL10} instance.
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*/
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public GL10 getGL()
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{
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return mGL;
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}
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/**
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* Gets the underlying {@link EGLDisplay}.
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*
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* @return the underlying {@link EGLDisplay}
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*/
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public EGLDisplay getDisplay()
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{
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return mDisplay;
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}
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/**
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* Gets all supported framebuffer configurations for this device.
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*
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* @return all supported framebuffer configurations for this device.
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*/
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public EGLConfig[] getConfigs()
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{
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return mEGLConfigs;
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}
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/**
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* Gets the underlying {@link EGLContext}.
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*
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* @return the underlying {@link EGLContext}.
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*/
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public EGLContext getContext()
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{
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return mEGLContext;
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}
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/**
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* Gets the underlying {@link EGLSurface}.
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*
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* @return the underlying {@link EGLSurface}.
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*/
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public EGLSurface getSurface()
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{
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return mEGLSurface;
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}
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// Detects the specific kind of GL modes that are supported
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private boolean detect()
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{
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// Attributes for a visual in RGBA format with at least 8 bits per color.
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int[] attribs = {
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EGL10.EGL_RED_SIZE, 8,
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EGL10.EGL_GREEN_SIZE, 8,
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EGL10.EGL_BLUE_SIZE, 8,
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EGL10.EGL_NONE
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};
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// Get total number of configs available.
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int[] numConfigs = new int[1];
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if (!mEGL.eglChooseConfig(mDisplay, attribs, null, 0, numConfigs))
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{
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Log.e("EGLHelper", "Error retrieving number of EGL configs available.");
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return false;
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}
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// Now get all the configurations
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mEGLConfigs = new EGLConfig[numConfigs[0]];
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if (!mEGL.eglChooseConfig(mDisplay, attribs, mEGLConfigs, mEGLConfigs.length, numConfigs))
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{
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Log.e("EGLHelper", "Error retrieving all EGL configs.");
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return false;
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}
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for (int i = 0; i < mEGLConfigs.length; i++)
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{
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int[] attribVal = new int[1];
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boolean ret = mEGL.eglGetConfigAttrib(mDisplay, mEGLConfigs[i], EGL10.EGL_RENDERABLE_TYPE, attribVal);
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if (ret)
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{
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if ((attribVal[0] & EGL_OPENGL_BIT) != 0)
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supportGL = true;
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if ((attribVal[0] & EGL_OPENGL_ES2_BIT) != 0)
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supportGLES2 = true;
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if ((attribVal[0] & EGL_OPENGL_ES3_BIT_KHR) != 0)
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supportGLES3 = true;
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}
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}
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return true;
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}
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// Creates the context and surface.
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private void create(int width, int height, int renderableType)
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{
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int[] attribs = {
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EGL10.EGL_WIDTH, width,
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EGL10.EGL_HEIGHT, height,
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EGL10.EGL_RENDERABLE_TYPE, renderableType,
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EGL10.EGL_NONE
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};
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// Initially we just assume GLES2 will be the default context.
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int EGL_CONTEXT_CLIENT_VERSION = 0x3098;
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int[] ctx_attribs = {
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EGL_CONTEXT_CLIENT_VERSION, 2,
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EGL10.EGL_NONE
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};
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// Determine the type of context that will be created
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// and change the attribute arrays accordingly.
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switch (renderableType)
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{
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case EGL_OPENGL_ES_BIT:
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attribs[5] = EGL_OPENGL_ES_BIT;
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ctx_attribs[1] = 1;
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break;
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case EGL_OPENGL_BIT:
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attribs[5] = EGL_OPENGL_BIT;
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ctx_attribs[0] = EGL10.EGL_NONE;
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break;
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case EGL_OPENGL_ES3_BIT_KHR:
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attribs[5] = EGL_OPENGL_ES3_BIT_KHR;
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ctx_attribs[1] = 3;
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break;
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case EGL_OPENGL_ES2_BIT:
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default: // Fall-back to GLES 2.
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attribs[5] = EGL_OPENGL_ES2_BIT;
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ctx_attribs[1] = 2;
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break;
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}
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mEGLContext = mEGL.eglCreateContext(mDisplay, mEGLConfigs[0], EGL10.EGL_NO_CONTEXT, ctx_attribs);
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mEGLSurface = mEGL.eglCreatePbufferSurface(mDisplay, mEGLConfigs[0], attribs);
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mEGL.eglMakeCurrent(mDisplay, mEGLSurface, mEGLSurface, mEGLContext);
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mGL = (GL10) mEGLContext.getGL();
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}
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}
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