opengl 1.1 Archives - "Where to now?"

Some time ago I’ve made a short post (here) about the basics of how to get opengl infos on an android device. For an app I’m currently working on it was required to get all interesting information once more in my android device information application. The basic idea is to add a respective opengl 1.1 or opengl 2.0 and possibly even opengl 3.0+ context to the active view, load all information in the onSurfaceCreate method of the renderer and remove the view afterwards again.

You’d use it appropriatelly like that in your activity:

@Override
public void onPostCreate(Bundle savedInstanceState) {

     final GPU gpu = new GPU(context);

    // opengl 1.1 info
    gpu.loadOpenGLGles10Info(new GPU.OnCompleteCallback<OpenGLGles10Info>() {

        @Override
        public void onComplete(final OpenGLGles10Info info) {
            String toString = info.toString();
        }
    });

    // opengl 2.0 info
    gpu.loadOpenGLGles10Info(new GPU.OnCompleteCallback<OpenGLGles20Info>() {

        @Override
        public void onComplete(final OpenGLGles20Info info) {
            String toString = info.toString();
        }
    });
}

@Override

public void onPostCreate(Bundle savedInstanceState) {

final GPU gpu = new GPU(context);

// opengl 1.1 info

gpu.loadOpenGLGles10Info(new GPU.OnCompleteCallback<OpenGLGles10Info>() {

@Override

public void onComplete(final OpenGLGles10Info info) {

String toString = info.toString();

}

});

// opengl 2.0 info

gpu.loadOpenGLGles10Info(new GPU.OnCompleteCallback<OpenGLGles20Info>() {

@Override

public void onComplete(final OpenGLGles20Info info) {

String toString = info.toString();

}

});

}

Here is what I came up with:

package net.kibotu.android.deviceinfo;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.content.pm.ConfigurationInfo;
import android.opengl.GLES10;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.widget.FrameLayout;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.opengles.GL10;
import java.nio.IntBuffer;
import java.util.ArrayList;
import java.util.Arrays;

public class GPU {

    // region OpenGLGles10

    public static class OpenGLGles10Info extends OpenGLInfo {

        // general
        public String GL_RENDERER;
        public String GL_VERSION;
        public String GL_VENDOR;

        // texture related
        public int GL_MAX_TEXTURE_SIZE;
        public int GL_MAX_TEXTURE_UNITS;
        public int[] GL_MAX_VIEWPORT_DIMS;

        // fixed function pipeline constrains
        public int GL_MAX_MODELVIEW_STACK_DEPTH;
        public int GL_MAX_PROJECTION_STACK_DEPTH;
        public int GL_MAX_TEXTURE_STACK_DEPTH;
        public int GL_MAX_LIGHTS;
        public int GL_SUBPIXEL_BITS;
        public int GL_DEPTH_BITS;
        public int GL_STENCIL_BITS;
        public int GL_MAX_ELEMENTS_INDICES;
        public int GL_MAX_ELEMENTS_VERTICES;

        // extensions
        public String GL_EXTENSIONS;

        protected OpenGLGles10Info() {
            super(1);
        }

        @Override
        protected void loadOnCreate() {
            GL_RENDERER = glGetString(GLES10.GL_RENDERER);
            GL_VERSION = glGetString(GLES10.GL_VERSION);
            GL_VENDOR = glGetString(GLES10.GL_VENDOR);
            GL_MAX_TEXTURE_SIZE = glGetIntegerv(GLES10.GL_MAX_TEXTURE_SIZE);
            GL_MAX_TEXTURE_UNITS = glGetIntegerv(GLES10.GL_MAX_TEXTURE_UNITS);
            GL_MAX_LIGHTS = glGetIntegerv(GLES10.GL_MAX_LIGHTS);
            GL_SUBPIXEL_BITS = glGetIntegerv(GLES10.GL_SUBPIXEL_BITS);
            GL_MAX_ELEMENTS_VERTICES = glGetIntegerv(GLES10.GL_MAX_ELEMENTS_VERTICES);
            GL_MAX_ELEMENTS_INDICES = glGetIntegerv(GLES10.GL_MAX_ELEMENTS_INDICES);
            GL_MAX_MODELVIEW_STACK_DEPTH = glGetIntegerv(GLES10.GL_MAX_MODELVIEW_STACK_DEPTH);
            GL_MAX_PROJECTION_STACK_DEPTH = glGetIntegerv(GLES10.GL_MAX_PROJECTION_STACK_DEPTH);
            GL_MAX_TEXTURE_STACK_DEPTH = glGetIntegerv(GLES10.GL_MAX_TEXTURE_STACK_DEPTH);
            GL_DEPTH_BITS = glGetIntegerv(GLES10.GL_DEPTH_BITS);
            GL_STENCIL_BITS = glGetIntegerv(GLES10.GL_STENCIL_BITS);
            GL_EXTENSIONS = glGetString(GLES10.GL_EXTENSIONS);
            GL_MAX_VIEWPORT_DIMS = glGetIntegerv(GLES10.GL_MAX_VIEWPORT_DIMS, 2);
        }

        @Override
        public String toString() {
            return "OpenGLGles10Info{" + '\n' +
                    "GL_RENDERER='" + GL_RENDERER + '\'' + '\n' +
                    ", GL_VERSION='" + GL_VERSION + '\'' + '\n' +
                    ", GL_VENDOR='" + GL_VENDOR + '\'' + '\n' +
                    ", GL_MAX_TEXTURE_SIZE=" + GL_MAX_TEXTURE_SIZE + '\n' +
                    ", GL_MAX_TEXTURE_UNITS=" + GL_MAX_TEXTURE_UNITS + '\n' +
                    ", GL_MAX_VIEWPORT_DIMS=" + Arrays.toString(GL_MAX_VIEWPORT_DIMS) + '\n' +
                    ", GL_MAX_MODELVIEW_STACK_DEPTH=" + GL_MAX_MODELVIEW_STACK_DEPTH + '\n' +
                    ", GL_MAX_PROJECTION_STACK_DEPTH=" + GL_MAX_PROJECTION_STACK_DEPTH + '\n' +
                    ", GL_MAX_TEXTURE_STACK_DEPTH=" + GL_MAX_TEXTURE_STACK_DEPTH +
                    ", GL_MAX_LIGHTS=" + GL_MAX_LIGHTS + '\n' +
                    ", GL_SUBPIXEL_BITS=" + GL_SUBPIXEL_BITS + '\n' +
                    ", GL_DEPTH_BITS=" + GL_DEPTH_BITS + '\n' +
                    ", GL_STENCIL_BITS=" + GL_STENCIL_BITS + '\n' +
                    ", GL_MAX_ELEMENTS_INDICES=" + GL_MAX_ELEMENTS_INDICES + '\n' +
                    ", GL_MAX_ELEMENTS_VERTICES=" + GL_MAX_ELEMENTS_VERTICES + '\n' +
                    ", GL_EXTENSIONS='" + GL_EXTENSIONS + '\'' + '\n' +
                    '}';
        }
    }

    // endregion

    // region OpenGLGles20

    public static class OpenGLGles20Info extends OpenGLInfo {

        // general
        public String GL_RENDERER;
        public String GL_VERSION;
        public String GL_VENDOR;
        public String GL_SHADING_LANGUAGE_VERSION;

        // texture related
        public int GL_MAX_TEXTURE_SIZE;
        public int GL_MAX_TEXTURE_UNITS;
        public int GL_MAX_TEXTURE_IMAGE_UNITS;
        public int GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS;
        public int GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS;
        public int GL_MAX_CUBE_MAP_TEXTURE_SIZE;
        public int[] GL_MAX_VIEWPORT_DIMS;
        public int GL_MAX_RENDERBUFFER_SIZE;
        public boolean Vertex_Texture_Fetch;

        // shader constrains
        public int GL_MAX_VERTEX_UNIFORM_VECTORS;
        public int GL_MAX_VERTEX_ATTRIBS;
        public int GL_MAX_VARYING_VECTORS;
        public int GL_MAX_FRAGMENT_UNIFORM_VECTORS;

        // extensions
        public String GL_EXTENSIONS;

        // precision [] { -range, range, precision }
        public int[] GL_VERTEX_SHADER_GL_LOW_INT;
        public int[] GL_VERTEX_SHADER_GL_MEDIUM_INT;
        public int[] GL_VERTEX_SHADER_GL_HIGH_INT;
        public int[] GL_VERTEX_SHADER_GL_LOW_FLOAT;
        public int[] GL_VERTEX_SHADER_GL_MEDIUM_FLOAT;
        public int[] GL_VERTEX_SHADER_GL_HIGH_FLOAT;

        public int[] GL_FRAGMENT_SHADER_GL_LOW_INT;
        public int[] GL_FRAGMENT_SHADER_GL_MEDIUM_INT;
        public int[] GL_FRAGMENT_SHADER_GL_HIGH_INT;
        public int[] GL_FRAGMENT_SHADER_GL_LOW_FLOAT;
        public int[] GL_FRAGMENT_SHADER_GL_MEDIUM_FLOAT;
        public int[] GL_FRAGMENT_SHADER_GL_HIGH_FLOAT;

        protected OpenGLGles20Info() {
            super(GPU.supportsOpenGLES2() ? 2 : 1);
        }

        @Override
        protected void loadOnCreate() {

            GL_RENDERER = glGetString(GLES10.GL_RENDERER);
            GL_VERSION = glGetString(GLES10.GL_VERSION);
            GL_VENDOR = glGetString(GLES10.GL_VENDOR);
            GL_SHADING_LANGUAGE_VERSION = glGetString(GLES20.GL_SHADING_LANGUAGE_VERSION);

            GL_MAX_TEXTURE_SIZE = glGetIntegerv(GLES10.GL_MAX_TEXTURE_SIZE);
            GL_MAX_TEXTURE_UNITS = glGetIntegerv(GLES10.GL_MAX_TEXTURE_UNITS);
            GL_MAX_VERTEX_ATTRIBS = glGetIntegerv(GLES20.GL_MAX_VERTEX_ATTRIBS);
            GL_MAX_VERTEX_UNIFORM_VECTORS = glGetIntegerv(GLES20.GL_MAX_VERTEX_UNIFORM_VECTORS);
            GL_MAX_FRAGMENT_UNIFORM_VECTORS = glGetIntegerv(GLES20.GL_MAX_FRAGMENT_UNIFORM_VECTORS);
            GL_MAX_VARYING_VECTORS = glGetIntegerv(GLES20.GL_MAX_VARYING_VECTORS);
            Vertex_Texture_Fetch = isVTFSupported();
            GL_MAX_TEXTURE_IMAGE_UNITS = glGetIntegerv(GLES20.GL_MAX_TEXTURE_IMAGE_UNITS);
            GL_MAX_VIEWPORT_DIMS = glGetIntegerv(GLES10.GL_MAX_VIEWPORT_DIMS, 2);
            GL_EXTENSIONS = glGetString(GLES10.GL_EXTENSIONS);
            GL_MAX_RENDERBUFFER_SIZE = glGetIntegerv(GLES20.GL_MAX_RENDERBUFFER_SIZE);
            GL_MAX_CUBE_MAP_TEXTURE_SIZE = glGetIntegerv(GLES20.GL_MAX_CUBE_MAP_TEXTURE_SIZE);
            GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS = glGetIntegerv(GLES20.GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS);
            GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS = glGetIntegerv(GLES20.GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS);

            GL_VERTEX_SHADER_GL_LOW_INT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_LOW_INT);
            GL_VERTEX_SHADER_GL_MEDIUM_INT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_MEDIUM_INT);
            GL_VERTEX_SHADER_GL_HIGH_INT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_HIGH_INT);

            GL_VERTEX_SHADER_GL_LOW_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_LOW_FLOAT);
            GL_VERTEX_SHADER_GL_MEDIUM_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_MEDIUM_FLOAT);
            GL_VERTEX_SHADER_GL_HIGH_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_HIGH_FLOAT);

            GL_FRAGMENT_SHADER_GL_LOW_INT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_LOW_INT);
            GL_FRAGMENT_SHADER_GL_MEDIUM_INT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_MEDIUM_INT);
            GL_FRAGMENT_SHADER_GL_HIGH_INT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_HIGH_INT);

            GL_FRAGMENT_SHADER_GL_LOW_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_LOW_FLOAT);
            GL_FRAGMENT_SHADER_GL_MEDIUM_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_MEDIUM_FLOAT);
            GL_FRAGMENT_SHADER_GL_HIGH_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_HIGH_FLOAT);
        }

        @Override
        public String toString() {
            return "OpenGLGles20Info{" +
                    "GL_RENDERER='" + GL_RENDERER + '\'' +
                    ", GL_VERSION='" + GL_VERSION + '\'' +
                    ", GL_VENDOR='" + GL_VENDOR + '\'' +
                    ", GL_SHADING_LANGUAGE_VERSION='" + GL_SHADING_LANGUAGE_VERSION + '\'' +
                    ", GL_MAX_TEXTURE_SIZE=" + GL_MAX_TEXTURE_SIZE +
                    ", GL_MAX_TEXTURE_UNITS=" + GL_MAX_TEXTURE_UNITS +
                    ", GL_MAX_TEXTURE_IMAGE_UNITS=" + GL_MAX_TEXTURE_IMAGE_UNITS +
                    ", GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS=" + GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS +
                    ", GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS=" + GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS +
                    ", GL_MAX_CUBE_MAP_TEXTURE_SIZE=" + GL_MAX_CUBE_MAP_TEXTURE_SIZE +
                    ", GL_MAX_VIEWPORT_DIMS=" + Arrays.toString(GL_MAX_VIEWPORT_DIMS) +
                    ", GL_MAX_RENDERBUFFER_SIZE=" + GL_MAX_RENDERBUFFER_SIZE +
                    ", Vertex_Texture_Fetch=" + Vertex_Texture_Fetch +
                    ", GL_MAX_VERTEX_UNIFORM_VECTORS=" + GL_MAX_VERTEX_UNIFORM_VECTORS +
                    ", GL_MAX_VERTEX_ATTRIBS=" + GL_MAX_VERTEX_ATTRIBS +
                    ", GL_MAX_VARYING_VECTORS=" + GL_MAX_VARYING_VECTORS +
                    ", GL_MAX_FRAGMENT_UNIFORM_VECTORS=" + GL_MAX_FRAGMENT_UNIFORM_VECTORS +
                    ", GL_EXTENSIONS='" + GL_EXTENSIONS + '\'' +
                    ", GL_VERTEX_SHADER_GL_LOW_INT=" + Arrays.toString(GL_VERTEX_SHADER_GL_LOW_INT) +
                    ", GL_VERTEX_SHADER_GL_MEDIUM_INT=" + Arrays.toString(GL_VERTEX_SHADER_GL_MEDIUM_INT) +
                    ", GL_VERTEX_SHADER_GL_HIGH_INT=" + Arrays.toString(GL_VERTEX_SHADER_GL_HIGH_INT) +
                    ", GL_VERTEX_SHADER_GL_LOW_FLOAT=" + Arrays.toString(GL_VERTEX_SHADER_GL_LOW_FLOAT) +
                    ", GL_VERTEX_SHADER_GL_MEDIUM_FLOAT=" + Arrays.toString(GL_VERTEX_SHADER_GL_MEDIUM_FLOAT) +
                    ", GL_VERTEX_SHADER_GL_HIGH_FLOAT=" + Arrays.toString(GL_VERTEX_SHADER_GL_HIGH_FLOAT) +
                    ", GL_FRAGMENT_SHADER_GL_LOW_INT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_LOW_INT) +
                    ", GL_FRAGMENT_SHADER_GL_MEDIUM_INT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_MEDIUM_INT) +
                    ", GL_FRAGMENT_SHADER_GL_HIGH_INT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_HIGH_INT) +
                    ", GL_FRAGMENT_SHADER_GL_LOW_FLOAT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_LOW_FLOAT) +
                    ", GL_FRAGMENT_SHADER_GL_MEDIUM_FLOAT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_MEDIUM_FLOAT) +
                    ", GL_FRAGMENT_SHADER_GL_HIGH_FLOAT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_HIGH_FLOAT) +
                    '}';
        }
    }

    // endregion

    // region glGet

    private static Activity context;
    private volatile static IntBuffer buffer = IntBuffer.allocate(1);
    private volatile static IntBuffer buffer2 = IntBuffer.allocate(2);
    private volatile static int[] arrayBuffer = new int[1];

    public GPU(final Activity context) {
        GPU.context = context;
    }

    public synchronized static String glGetString(int value) {
        return GLES10.glGetString(value);
    }

    public synchronized static int glGetIntegerv(int value) {
        buffer.clear();
        GLES10.glGetIntegerv(value, buffer);
        return buffer.get(0);
    }

    public synchronized static int[] glGetIntegerv(int value, int size) {
        final IntBuffer buffer = IntBuffer.allocate(size);
        GLES10.glGetIntegerv(value, buffer);
        return buffer.array();
    }

    public synchronized static int[] glGetShaderPrecisionFormat(int shaderType, int precisionType) {
        if (!DeviceOld.supportsOpenGLES2()) return new int[]{0, 0, 0};
        buffer2.clear();
        GLES20.glGetShaderPrecisionFormat(shaderType, precisionType, buffer2, buffer);
        return new int[]{buffer2.get(0), buffer2.get(1), buffer.get(0)};
    }

    public synchronized static int eglGetConfigAttrib(int eglType, final EGL10 egl, final EGLDisplay display, final EGLConfig eglConfig) {
        egl.eglGetConfigAttrib(display, eglConfig, eglType, arrayBuffer);
        return arrayBuffer[0];
    }

    public static boolean isVTFSupported() {
        GLES10.glGetIntegerv(GLES20.GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, arrayBuffer, 0);
        return arrayBuffer[0] != 0;
    }

    private static int getOpenGLVersion() {
        final ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();
        return configurationInfo.reqGlEsVersion;
    }

    private static boolean supportsOpenGLES2() {
        return getOpenGLVersion() >= 0x20000;
    }

    // endregion

    // region GPU

    public void loadOpenGLGles10Info(final OnCompleteCallback<OpenGLGles10Info> callback) {
        new InfoLoader<OpenGLGles10Info>(new OpenGLGles10Info()).loadInfo(callback);
    }

    public void loadOpenGLGles20Info(final OnCompleteCallback<OpenGLGles20Info> callback) {
        new InfoLoader<OpenGLGles20Info>(new OpenGLGles20Info()).loadInfo(callback);
    }

    // endregion

    // region interfaces

    public interface OnCompleteCallback<T> {
        void onComplete(final T result);
    }

    private static abstract class OpenGLInfo {

        final int eGLContextClientVersion;
        public ArrayList<Egl> eglconfigs;

        protected OpenGLInfo(final int eGLContextClientVersion) {
            this.eGLContextClientVersion = eGLContextClientVersion;
            eglconfigs = new ArrayList<Egl>();
        }

        /**
         * Basically run this in a successfully running GLSurfaceView.Renderer.onSurfaceCreated.
         * Guaranties valid OpenGL context.
         */
        protected abstract void loadOnCreate();
    }

    // endregion

    // region InfoLoader

    public static class InfoLoader<T extends OpenGLInfo> {

        private volatile GPURenderer<T> renderer;
        private T info;

        protected InfoLoader(final T info) {
            this.info = info;
        }

        private void loadInfo(final OnCompleteCallback<T> callback) {

            context.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    // new view
                    final GLSurfaceView glView = new GLSurfaceView(context);

                    // egl info
                    glView.setEGLConfigChooser(new EglChooser<T>(info));

                    // need to be on top to be rendered at least for one frame
                    glView.setZOrderOnTop(true);

                    // create new renderer; note: we only need the oncreate method for all the infos
                    renderer = new GPURenderer<T>(glView, info, callback);

                    // set opengl version
                    glView.setEGLContextClientVersion(info.eGLContextClientVersion);

                    // set renderer
                    glView.setRenderer(renderer);

                    // add opengl view to current active view
                    final FrameLayout layout = (FrameLayout) context.findViewById(android.R.id.content); // Note: needs to be layout of current active view
                    layout.addView(glView);
                }
            });
        }
    }

    // endregion

    // region GPURenderer

    private static class GPURenderer<T extends OpenGLInfo> implements GLSurfaceView.Renderer {

        private GLSurfaceView glSurfaceView;
        private T result;
        private OnCompleteCallback<T> callback;

        protected GPURenderer(final GLSurfaceView glSurfaceView, final T result, final OnCompleteCallback<T> callback) {
            this.result = result;
            this.glSurfaceView = glSurfaceView;
            this.callback = callback;
        }

        @Override
        public void onSurfaceCreated(final GL10 gl, final EGLConfig eglConfig) {

            // loadOnCreate info
            result.loadOnCreate();

            // remove view
            context.runOnUiThread(new Runnable() {
                @Override
                public void run() {

                    final FrameLayout layout = (FrameLayout) context.findViewById(android.R.id.content);
                    layout.removeView(glSurfaceView);

                    // call callback
                    if (callback != null) callback.onComplete(result);
                }
            });
        }

        @Override
        public void onSurfaceChanged(final GL10 gl10, final int width, final int height) {
            // do nothing
        }

        @Override
        public void onDrawFrame(final GL10 gl) {
            // do nothing
        }
    }

    final private static class EglChooser<T extends OpenGLInfo> implements GLSurfaceView.EGLConfigChooser {

        public T info;

        private EglChooser(final T info) {
            this.info = info;
        }

        @Override
        public EGLConfig chooseConfig(final EGL10 egl, final EGLDisplay display) {

            //Querying number of configurations
            final int[] num_conf = new int[1];
            egl.eglGetConfigs(display, null, 0, num_conf); //if configuration array is null it still returns the number of configurations
            final int configurations = num_conf[0];

            //Querying actual configurations
            final EGLConfig[] conf = new EGLConfig[configurations];
            egl.eglGetConfigs(display, conf, configurations, num_conf);

            EGLConfig result = null;

            for (int i = 0; i < configurations; i++) {
                result = better(result, conf[i], egl, display);

                final Egl config = new Egl(egl, display, conf[i]);
                if (config.EGL_RED_SIZE + config.EGL_BLUE_SIZE + config.EGL_GREEN_SIZE + config.EGL_ALPHA_SIZE >= 16)
                    info.eglconfigs.add(config);
            }

            return result;
        }

        /**
         * Returns the best of the two EGLConfig passed according to depth and colours
         *
         * @param a The first candidate
         * @param b The second candidate
         * @return The chosen candidate
         */
        private EGLConfig better(EGLConfig a, EGLConfig b, EGL10 egl, EGLDisplay display) {
            if (a == null) return b;

            EGLConfig result;

            int[] value = new int[1];

            egl.eglGetConfigAttrib(display, a, EGL10.EGL_DEPTH_SIZE, value);
            int depthA = value[0];

            egl.eglGetConfigAttrib(display, b, EGL10.EGL_DEPTH_SIZE, value);
            int depthB = value[0];

            if (depthA > depthB)
                result = a;
            else if (depthA < depthB)
                result = b;
            else //if depthA == depthB
            {
                egl.eglGetConfigAttrib(display, a, EGL10.EGL_RED_SIZE, value);
                int redA = value[0];

                egl.eglGetConfigAttrib(display, b, EGL10.EGL_RED_SIZE, value);
                int redB = value[0];

                if (redA > redB)
                    result = a;
                else if (redA < redB)
                    result = b;
                else //if redA == redB
                {
                    //Don't care
                    result = a;
                }
            }

            return result;
        }
    }

    public final static class Egl {

        public final int EGL_NON_CONFORMANT_CONFIG;
        public final int EGL_SAMPLES;
        public final int EGL_STENCIL_SIZE;
        public final int EGL_DEPTH_SIZE;
        public final int EGL_ALPHA_SIZE;
        public final int EGL_BLUE_SIZE;
        public final int EGL_GREEN_SIZE;
        public final int EGL_RED_SIZE;

        public Egl(final EGL10 egl, final EGLDisplay display, final EGLConfig eglConfig) {
            EGL_RED_SIZE = eglGetConfigAttrib(EGL10.EGL_RED_SIZE, egl, display, eglConfig);
            EGL_BLUE_SIZE = eglGetConfigAttrib(EGL10.EGL_BLUE_SIZE, egl, display, eglConfig);
            EGL_GREEN_SIZE = eglGetConfigAttrib(EGL10.EGL_GREEN_SIZE, egl, display, eglConfig);
            EGL_ALPHA_SIZE = eglGetConfigAttrib(EGL10.EGL_ALPHA_SIZE, egl, display, eglConfig);
            EGL_DEPTH_SIZE = eglGetConfigAttrib(EGL10.EGL_DEPTH_SIZE, egl, display, eglConfig);
            EGL_STENCIL_SIZE = eglGetConfigAttrib(EGL10.EGL_STENCIL_SIZE, egl, display, eglConfig);
            EGL_SAMPLES = eglGetConfigAttrib(EGL10.EGL_SAMPLES, egl, display, eglConfig);
            EGL_NON_CONFORMANT_CONFIG = eglGetConfigAttrib(EGL10.EGL_NON_CONFORMANT_CONFIG, egl, display, eglConfig);
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;

            Egl egl = (Egl) o;

            if (EGL_ALPHA_SIZE != egl.EGL_ALPHA_SIZE) return false;
            if (EGL_BLUE_SIZE != egl.EGL_BLUE_SIZE) return false;
            if (EGL_DEPTH_SIZE != egl.EGL_DEPTH_SIZE) return false;
            if (EGL_GREEN_SIZE != egl.EGL_GREEN_SIZE) return false;
            if (EGL_NON_CONFORMANT_CONFIG != egl.EGL_NON_CONFORMANT_CONFIG) return false;
            if (EGL_RED_SIZE != egl.EGL_RED_SIZE) return false;
            if (EGL_SAMPLES != egl.EGL_SAMPLES) return false;
            if (EGL_STENCIL_SIZE != egl.EGL_STENCIL_SIZE) return false;

            return true;
        }

        @Override
        public int hashCode() {
            int result = EGL_NON_CONFORMANT_CONFIG;
            result = 31 * result + EGL_SAMPLES;
            result = 31 * result + EGL_STENCIL_SIZE;
            result = 31 * result + EGL_DEPTH_SIZE;
            result = 31 * result + EGL_ALPHA_SIZE;
            result = 31 * result + EGL_BLUE_SIZE;
            result = 31 * result + EGL_GREEN_SIZE;
            result = 31 * result + EGL_RED_SIZE;
            return result;
        }

        @Override
        public String toString() {

            // rgba (rgba) depth stencil samples non comfort
            return "RGB" + (EGL_ALPHA_SIZE > 0 ? "A" : "") +
                    " " + (EGL_RED_SIZE + EGL_GREEN_SIZE + EGL_BLUE_SIZE + EGL_ALPHA_SIZE) + " bit" +
                    " (" + EGL_RED_SIZE + "" + EGL_GREEN_SIZE + EGL_BLUE_SIZE + "" + (EGL_ALPHA_SIZE > 0 ? EGL_ALPHA_SIZE : "") + ")" +
                    (EGL_DEPTH_SIZE > 0 ? " Depth " + EGL_DEPTH_SIZE + "bit" : "") +
                    (EGL_STENCIL_SIZE > 0 ? " Stencil " + EGL_STENCIL_SIZE : "") +
                    (EGL_SAMPLES > 0 ? " Samples x" + EGL_SAMPLES : "") +
                    (EGL_NON_CONFORMANT_CONFIG > 0 ? " Non-Conformant" : "");
        }
    }

    // endregion
}

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package net.kibotu.android.deviceinfo;

import android.app.Activity;

import android.app.ActivityManager;

import android.content.Context;

import android.content.pm.ConfigurationInfo;

import android.opengl.GLES10;

import android.opengl.GLES20;

import android.opengl.GLSurfaceView;

import android.widget.FrameLayout;

import javax.microedition.khronos.egl.EGL10;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.egl.EGLDisplay;

import javax.microedition.khronos.opengles.GL10;

import java.nio.IntBuffer;

import java.util.ArrayList;

import java.util.Arrays;

public class GPU {

// region OpenGLGles10

public static class OpenGLGles10Info extends OpenGLInfo {

// general

public String GL_RENDERER;

public String GL_VERSION;

public String GL_VENDOR;

// texture related

public int GL_MAX_TEXTURE_SIZE;

public int GL_MAX_TEXTURE_UNITS;

public int[] GL_MAX_VIEWPORT_DIMS;

// fixed function pipeline constrains

public int GL_MAX_MODELVIEW_STACK_DEPTH;

public int GL_MAX_PROJECTION_STACK_DEPTH;

public int GL_MAX_TEXTURE_STACK_DEPTH;

public int GL_MAX_LIGHTS;

public int GL_SUBPIXEL_BITS;

public int GL_DEPTH_BITS;

public int GL_STENCIL_BITS;

public int GL_MAX_ELEMENTS_INDICES;

public int GL_MAX_ELEMENTS_VERTICES;

// extensions

public String GL_EXTENSIONS;

protected OpenGLGles10Info() {

super(1);

}

@Override

protected void loadOnCreate() {

GL_RENDERER = glGetString(GLES10.GL_RENDERER);

GL_VERSION = glGetString(GLES10.GL_VERSION);

GL_VENDOR = glGetString(GLES10.GL_VENDOR);

GL_MAX_TEXTURE_SIZE = glGetIntegerv(GLES10.GL_MAX_TEXTURE_SIZE);

GL_MAX_TEXTURE_UNITS = glGetIntegerv(GLES10.GL_MAX_TEXTURE_UNITS);

GL_MAX_LIGHTS = glGetIntegerv(GLES10.GL_MAX_LIGHTS);

GL_SUBPIXEL_BITS = glGetIntegerv(GLES10.GL_SUBPIXEL_BITS);

GL_MAX_ELEMENTS_VERTICES = glGetIntegerv(GLES10.GL_MAX_ELEMENTS_VERTICES);

GL_MAX_ELEMENTS_INDICES = glGetIntegerv(GLES10.GL_MAX_ELEMENTS_INDICES);

GL_MAX_MODELVIEW_STACK_DEPTH = glGetIntegerv(GLES10.GL_MAX_MODELVIEW_STACK_DEPTH);

GL_MAX_PROJECTION_STACK_DEPTH = glGetIntegerv(GLES10.GL_MAX_PROJECTION_STACK_DEPTH);

GL_MAX_TEXTURE_STACK_DEPTH = glGetIntegerv(GLES10.GL_MAX_TEXTURE_STACK_DEPTH);

GL_DEPTH_BITS = glGetIntegerv(GLES10.GL_DEPTH_BITS);

GL_STENCIL_BITS = glGetIntegerv(GLES10.GL_STENCIL_BITS);

GL_EXTENSIONS = glGetString(GLES10.GL_EXTENSIONS);

GL_MAX_VIEWPORT_DIMS = glGetIntegerv(GLES10.GL_MAX_VIEWPORT_DIMS, 2);

}

@Override

public String toString() {

return "OpenGLGles10Info{" + '\n' +

"GL_RENDERER='" + GL_RENDERER + '\'' + '\n' +

", GL_VERSION='" + GL_VERSION + '\'' + '\n' +

", GL_VENDOR='" + GL_VENDOR + '\'' + '\n' +

", GL_MAX_TEXTURE_SIZE=" + GL_MAX_TEXTURE_SIZE + '\n' +

", GL_MAX_TEXTURE_UNITS=" + GL_MAX_TEXTURE_UNITS + '\n' +

", GL_MAX_VIEWPORT_DIMS=" + Arrays.toString(GL_MAX_VIEWPORT_DIMS) + '\n' +

", GL_MAX_MODELVIEW_STACK_DEPTH=" + GL_MAX_MODELVIEW_STACK_DEPTH + '\n' +

", GL_MAX_PROJECTION_STACK_DEPTH=" + GL_MAX_PROJECTION_STACK_DEPTH + '\n' +

", GL_MAX_TEXTURE_STACK_DEPTH=" + GL_MAX_TEXTURE_STACK_DEPTH +

", GL_MAX_LIGHTS=" + GL_MAX_LIGHTS + '\n' +

", GL_SUBPIXEL_BITS=" + GL_SUBPIXEL_BITS + '\n' +

", GL_DEPTH_BITS=" + GL_DEPTH_BITS + '\n' +

", GL_STENCIL_BITS=" + GL_STENCIL_BITS + '\n' +

", GL_MAX_ELEMENTS_INDICES=" + GL_MAX_ELEMENTS_INDICES + '\n' +

", GL_MAX_ELEMENTS_VERTICES=" + GL_MAX_ELEMENTS_VERTICES + '\n' +

", GL_EXTENSIONS='" + GL_EXTENSIONS + '\'' + '\n' +

'}';

}

// endregion

// region OpenGLGles20

public static class OpenGLGles20Info extends OpenGLInfo {

// general

public String GL_RENDERER;

public String GL_VERSION;

public String GL_VENDOR;

public String GL_SHADING_LANGUAGE_VERSION;

// texture related

public int GL_MAX_TEXTURE_SIZE;

public int GL_MAX_TEXTURE_UNITS;

public int GL_MAX_TEXTURE_IMAGE_UNITS;

public int GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS;

public int GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS;

public int GL_MAX_CUBE_MAP_TEXTURE_SIZE;

public int[] GL_MAX_VIEWPORT_DIMS;

public int GL_MAX_RENDERBUFFER_SIZE;

public boolean Vertex_Texture_Fetch;

// shader constrains

public int GL_MAX_VERTEX_UNIFORM_VECTORS;

public int GL_MAX_VERTEX_ATTRIBS;

public int GL_MAX_VARYING_VECTORS;

public int GL_MAX_FRAGMENT_UNIFORM_VECTORS;

// extensions

public String GL_EXTENSIONS;

// precision [] { -range, range, precision }

public int[] GL_VERTEX_SHADER_GL_LOW_INT;

public int[] GL_VERTEX_SHADER_GL_MEDIUM_INT;

public int[] GL_VERTEX_SHADER_GL_HIGH_INT;

public int[] GL_VERTEX_SHADER_GL_LOW_FLOAT;

public int[] GL_VERTEX_SHADER_GL_MEDIUM_FLOAT;

public int[] GL_VERTEX_SHADER_GL_HIGH_FLOAT;

public int[] GL_FRAGMENT_SHADER_GL_LOW_INT;

public int[] GL_FRAGMENT_SHADER_GL_MEDIUM_INT;

public int[] GL_FRAGMENT_SHADER_GL_HIGH_INT;

public int[] GL_FRAGMENT_SHADER_GL_LOW_FLOAT;

public int[] GL_FRAGMENT_SHADER_GL_MEDIUM_FLOAT;

public int[] GL_FRAGMENT_SHADER_GL_HIGH_FLOAT;

protected OpenGLGles20Info() {

super(GPU.supportsOpenGLES2() ? 2 : 1);

}

@Override

protected void loadOnCreate() {

GL_RENDERER = glGetString(GLES10.GL_RENDERER);

GL_VERSION = glGetString(GLES10.GL_VERSION);

GL_VENDOR = glGetString(GLES10.GL_VENDOR);

GL_SHADING_LANGUAGE_VERSION = glGetString(GLES20.GL_SHADING_LANGUAGE_VERSION);

GL_MAX_TEXTURE_SIZE = glGetIntegerv(GLES10.GL_MAX_TEXTURE_SIZE);

GL_MAX_TEXTURE_UNITS = glGetIntegerv(GLES10.GL_MAX_TEXTURE_UNITS);

GL_MAX_VERTEX_ATTRIBS = glGetIntegerv(GLES20.GL_MAX_VERTEX_ATTRIBS);

GL_MAX_VERTEX_UNIFORM_VECTORS = glGetIntegerv(GLES20.GL_MAX_VERTEX_UNIFORM_VECTORS);

GL_MAX_FRAGMENT_UNIFORM_VECTORS = glGetIntegerv(GLES20.GL_MAX_FRAGMENT_UNIFORM_VECTORS);

GL_MAX_VARYING_VECTORS = glGetIntegerv(GLES20.GL_MAX_VARYING_VECTORS);

Vertex_Texture_Fetch = isVTFSupported();

GL_MAX_TEXTURE_IMAGE_UNITS = glGetIntegerv(GLES20.GL_MAX_TEXTURE_IMAGE_UNITS);

GL_MAX_VIEWPORT_DIMS = glGetIntegerv(GLES10.GL_MAX_VIEWPORT_DIMS, 2);

GL_EXTENSIONS = glGetString(GLES10.GL_EXTENSIONS);

GL_MAX_RENDERBUFFER_SIZE = glGetIntegerv(GLES20.GL_MAX_RENDERBUFFER_SIZE);

GL_MAX_CUBE_MAP_TEXTURE_SIZE = glGetIntegerv(GLES20.GL_MAX_CUBE_MAP_TEXTURE_SIZE);

GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS = glGetIntegerv(GLES20.GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS);

GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS = glGetIntegerv(GLES20.GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS);

GL_VERTEX_SHADER_GL_LOW_INT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_LOW_INT);

GL_VERTEX_SHADER_GL_MEDIUM_INT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_MEDIUM_INT);

GL_VERTEX_SHADER_GL_HIGH_INT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_HIGH_INT);

GL_VERTEX_SHADER_GL_LOW_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_LOW_FLOAT);

GL_VERTEX_SHADER_GL_MEDIUM_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_MEDIUM_FLOAT);

GL_VERTEX_SHADER_GL_HIGH_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_VERTEX_SHADER, GLES20.GL_HIGH_FLOAT);

GL_FRAGMENT_SHADER_GL_LOW_INT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_LOW_INT);

GL_FRAGMENT_SHADER_GL_MEDIUM_INT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_MEDIUM_INT);

GL_FRAGMENT_SHADER_GL_HIGH_INT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_HIGH_INT);

GL_FRAGMENT_SHADER_GL_LOW_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_LOW_FLOAT);

GL_FRAGMENT_SHADER_GL_MEDIUM_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_MEDIUM_FLOAT);

GL_FRAGMENT_SHADER_GL_HIGH_FLOAT = glGetShaderPrecisionFormat(GLES20.GL_FRAGMENT_SHADER, GLES20.GL_HIGH_FLOAT);

}

@Override

public String toString() {

return "OpenGLGles20Info{" +

"GL_RENDERER='" + GL_RENDERER + '\'' +

", GL_VERSION='" + GL_VERSION + '\'' +

", GL_VENDOR='" + GL_VENDOR + '\'' +

", GL_SHADING_LANGUAGE_VERSION='" + GL_SHADING_LANGUAGE_VERSION + '\'' +

", GL_MAX_TEXTURE_SIZE=" + GL_MAX_TEXTURE_SIZE +

", GL_MAX_TEXTURE_UNITS=" + GL_MAX_TEXTURE_UNITS +

", GL_MAX_TEXTURE_IMAGE_UNITS=" + GL_MAX_TEXTURE_IMAGE_UNITS +

", GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS=" + GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS +

", GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS=" + GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS +

", GL_MAX_CUBE_MAP_TEXTURE_SIZE=" + GL_MAX_CUBE_MAP_TEXTURE_SIZE +

", GL_MAX_VIEWPORT_DIMS=" + Arrays.toString(GL_MAX_VIEWPORT_DIMS) +

", GL_MAX_RENDERBUFFER_SIZE=" + GL_MAX_RENDERBUFFER_SIZE +

", Vertex_Texture_Fetch=" + Vertex_Texture_Fetch +

", GL_MAX_VERTEX_UNIFORM_VECTORS=" + GL_MAX_VERTEX_UNIFORM_VECTORS +

", GL_MAX_VERTEX_ATTRIBS=" + GL_MAX_VERTEX_ATTRIBS +

", GL_MAX_VARYING_VECTORS=" + GL_MAX_VARYING_VECTORS +

", GL_MAX_FRAGMENT_UNIFORM_VECTORS=" + GL_MAX_FRAGMENT_UNIFORM_VECTORS +

", GL_EXTENSIONS='" + GL_EXTENSIONS + '\'' +

", GL_VERTEX_SHADER_GL_LOW_INT=" + Arrays.toString(GL_VERTEX_SHADER_GL_LOW_INT) +

", GL_VERTEX_SHADER_GL_MEDIUM_INT=" + Arrays.toString(GL_VERTEX_SHADER_GL_MEDIUM_INT) +

", GL_VERTEX_SHADER_GL_HIGH_INT=" + Arrays.toString(GL_VERTEX_SHADER_GL_HIGH_INT) +

", GL_VERTEX_SHADER_GL_LOW_FLOAT=" + Arrays.toString(GL_VERTEX_SHADER_GL_LOW_FLOAT) +

", GL_VERTEX_SHADER_GL_MEDIUM_FLOAT=" + Arrays.toString(GL_VERTEX_SHADER_GL_MEDIUM_FLOAT) +

", GL_VERTEX_SHADER_GL_HIGH_FLOAT=" + Arrays.toString(GL_VERTEX_SHADER_GL_HIGH_FLOAT) +

", GL_FRAGMENT_SHADER_GL_LOW_INT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_LOW_INT) +

", GL_FRAGMENT_SHADER_GL_MEDIUM_INT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_MEDIUM_INT) +

", GL_FRAGMENT_SHADER_GL_HIGH_INT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_HIGH_INT) +

", GL_FRAGMENT_SHADER_GL_LOW_FLOAT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_LOW_FLOAT) +

", GL_FRAGMENT_SHADER_GL_MEDIUM_FLOAT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_MEDIUM_FLOAT) +

", GL_FRAGMENT_SHADER_GL_HIGH_FLOAT=" + Arrays.toString(GL_FRAGMENT_SHADER_GL_HIGH_FLOAT) +

'}';

}

// endregion

// region glGet

private static Activity context;

private volatile static IntBuffer buffer = IntBuffer.allocate(1);

private volatile static IntBuffer buffer2 = IntBuffer.allocate(2);

private volatile static int[] arrayBuffer = new int[1];

public GPU(final Activity context) {

GPU.context = context;

}

public synchronized static String glGetString(int value) {

return GLES10.glGetString(value);

}

public synchronized static int glGetIntegerv(int value) {

buffer.clear();

GLES10.glGetIntegerv(value, buffer);

return buffer.get(0);

}

public synchronized static int[] glGetIntegerv(int value, int size) {

final IntBuffer buffer = IntBuffer.allocate(size);

GLES10.glGetIntegerv(value, buffer);

return buffer.array();

}

public synchronized static int[] glGetShaderPrecisionFormat(int shaderType, int precisionType) {

if (!DeviceOld.supportsOpenGLES2()) return new int[]{0, 0, 0};

buffer2.clear();

GLES20.glGetShaderPrecisionFormat(shaderType, precisionType, buffer2, buffer);

return new int[]{buffer2.get(0), buffer2.get(1), buffer.get(0)};

}

public synchronized static int eglGetConfigAttrib(int eglType, final EGL10 egl, final EGLDisplay display, final EGLConfig eglConfig) {

egl.eglGetConfigAttrib(display, eglConfig, eglType, arrayBuffer);

return arrayBuffer[0];

}

public static boolean isVTFSupported() {

GLES10.glGetIntegerv(GLES20.GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, arrayBuffer, 0);

return arrayBuffer[0] != 0;

}

private static int getOpenGLVersion() {

final ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();

return configurationInfo.reqGlEsVersion;

}

private static boolean supportsOpenGLES2() {

return getOpenGLVersion() >= 0x20000;

}

// endregion

// region GPU

public void loadOpenGLGles10Info(final OnCompleteCallback<OpenGLGles10Info> callback) {

new InfoLoader<OpenGLGles10Info>(new OpenGLGles10Info()).loadInfo(callback);

}

public void loadOpenGLGles20Info(final OnCompleteCallback<OpenGLGles20Info> callback) {

new InfoLoader<OpenGLGles20Info>(new OpenGLGles20Info()).loadInfo(callback);

}

// endregion

// region interfaces

public interface OnCompleteCallback<T> {

void onComplete(final T result);

}

private static abstract class OpenGLInfo {

final int eGLContextClientVersion;

public ArrayList<Egl> eglconfigs;

protected OpenGLInfo(final int eGLContextClientVersion) {

this.eGLContextClientVersion = eGLContextClientVersion;

eglconfigs = new ArrayList<Egl>();

}

/**

* Basically run this in a successfully running GLSurfaceView.Renderer.onSurfaceCreated.

* Guaranties valid OpenGL context.

protected abstract void loadOnCreate();

}

// endregion

// region InfoLoader

public static class InfoLoader<T extends OpenGLInfo> {

private volatile GPURenderer<T> renderer;

private T info;

protected InfoLoader(final T info) {

this.info = info;

}

private void loadInfo(final OnCompleteCallback<T> callback) {

context.runOnUiThread(new Runnable() {

@Override

public void run() {

// new view

final GLSurfaceView glView = new GLSurfaceView(context);

// egl info

glView.setEGLConfigChooser(new EglChooser<T>(info));

// need to be on top to be rendered at least for one frame

glView.setZOrderOnTop(true);

// create new renderer; note: we only need the oncreate method for all the infos

renderer = new GPURenderer<T>(glView, info, callback);

// set opengl version

glView.setEGLContextClientVersion(info.eGLContextClientVersion);

// set renderer

glView.setRenderer(renderer);

// add opengl view to current active view

final FrameLayout layout = (FrameLayout) context.findViewById(android.R.id.content); // Note: needs to be layout of current active view

layout.addView(glView);

}

});

}

// endregion

// region GPURenderer

private static class GPURenderer<T extends OpenGLInfo> implements GLSurfaceView.Renderer {

private GLSurfaceView glSurfaceView;

private T result;

private OnCompleteCallback<T> callback;

protected GPURenderer(final GLSurfaceView glSurfaceView, final T result, final OnCompleteCallback<T> callback) {

this.result = result;

this.glSurfaceView = glSurfaceView;

this.callback = callback;

}

@Override

public void onSurfaceCreated(final GL10 gl, final EGLConfig eglConfig) {

// loadOnCreate info

result.loadOnCreate();

// remove view

context.runOnUiThread(new Runnable() {

@Override

public void run() {

final FrameLayout layout = (FrameLayout) context.findViewById(android.R.id.content);

layout.removeView(glSurfaceView);

// call callback

if (callback != null) callback.onComplete(result);

}

});

}

@Override

public void onSurfaceChanged(final GL10 gl10, final int width, final int height) {

// do nothing

}

@Override

public void onDrawFrame(final GL10 gl) {

// do nothing

}

final private static class EglChooser<T extends OpenGLInfo> implements GLSurfaceView.EGLConfigChooser {

public T info;

private EglChooser(final T info) {

this.info = info;

}

@Override

public EGLConfig chooseConfig(final EGL10 egl, final EGLDisplay display) {

//Querying number of configurations

final int[] num_conf = new int[1];

egl.eglGetConfigs(display, null, 0, num_conf); //if configuration array is null it still returns the number of configurations

final int configurations = num_conf[0];

//Querying actual configurations

final EGLConfig[] conf = new EGLConfig[configurations];

egl.eglGetConfigs(display, conf, configurations, num_conf);

EGLConfig result = null;

for (int i = 0; i < configurations; i++) {

result = better(result, conf[i], egl, display);

final Egl config = new Egl(egl, display, conf[i]);

if (config.EGL_RED_SIZE + config.EGL_BLUE_SIZE + config.EGL_GREEN_SIZE + config.EGL_ALPHA_SIZE >= 16)

info.eglconfigs.add(config);

}

return result;

}

/**

* Returns the best of the two EGLConfig passed according to depth and colours

* @param a The first candidate

* @param b The second candidate

* @return The chosen candidate

private EGLConfig better(EGLConfig a, EGLConfig b, EGL10 egl, EGLDisplay display) {

if (a == null) return b;

EGLConfig result;

int[] value = new int[1];

egl.eglGetConfigAttrib(display, a, EGL10.EGL_DEPTH_SIZE, value);

int depthA = value[0];

egl.eglGetConfigAttrib(display, b, EGL10.EGL_DEPTH_SIZE, value);

int depthB = value[0];

if (depthA > depthB)

result = a;

else if (depthA < depthB)

result = b;

else //if depthA == depthB

{

egl.eglGetConfigAttrib(display, a, EGL10.EGL_RED_SIZE, value);

int redA = value[0];

egl.eglGetConfigAttrib(display, b, EGL10.EGL_RED_SIZE, value);

int redB = value[0];

if (redA > redB)

result = a;

else if (redA < redB)

result = b;

else //if redA == redB

{

//Don't care

result = a;

}

return result;

}

public final static class Egl {

public final int EGL_NON_CONFORMANT_CONFIG;

public final int EGL_SAMPLES;

public final int EGL_STENCIL_SIZE;

public final int EGL_DEPTH_SIZE;

public final int EGL_ALPHA_SIZE;

public final int EGL_BLUE_SIZE;

public final int EGL_GREEN_SIZE;

public final int EGL_RED_SIZE;

public Egl(final EGL10 egl, final EGLDisplay display, final EGLConfig eglConfig) {

EGL_RED_SIZE = eglGetConfigAttrib(EGL10.EGL_RED_SIZE, egl, display, eglConfig);

EGL_BLUE_SIZE = eglGetConfigAttrib(EGL10.EGL_BLUE_SIZE, egl, display, eglConfig);

EGL_GREEN_SIZE = eglGetConfigAttrib(EGL10.EGL_GREEN_SIZE, egl, display, eglConfig);

EGL_ALPHA_SIZE = eglGetConfigAttrib(EGL10.EGL_ALPHA_SIZE, egl, display, eglConfig);

EGL_DEPTH_SIZE = eglGetConfigAttrib(EGL10.EGL_DEPTH_SIZE, egl, display, eglConfig);

EGL_STENCIL_SIZE = eglGetConfigAttrib(EGL10.EGL_STENCIL_SIZE, egl, display, eglConfig);

EGL_SAMPLES = eglGetConfigAttrib(EGL10.EGL_SAMPLES, egl, display, eglConfig);

EGL_NON_CONFORMANT_CONFIG = eglGetConfigAttrib(EGL10.EGL_NON_CONFORMANT_CONFIG, egl, display, eglConfig);

}

@Override

public boolean equals(Object o) {

if (this == o) return true;

if (o == null || getClass() != o.getClass()) return false;

Egl egl = (Egl) o;

if (EGL_ALPHA_SIZE != egl.EGL_ALPHA_SIZE) return false;

if (EGL_BLUE_SIZE != egl.EGL_BLUE_SIZE) return false;

if (EGL_DEPTH_SIZE != egl.EGL_DEPTH_SIZE) return false;

if (EGL_GREEN_SIZE != egl.EGL_GREEN_SIZE) return false;

if (EGL_NON_CONFORMANT_CONFIG != egl.EGL_NON_CONFORMANT_CONFIG) return false;

if (EGL_RED_SIZE != egl.EGL_RED_SIZE) return false;

if (EGL_SAMPLES != egl.EGL_SAMPLES) return false;

if (EGL_STENCIL_SIZE != egl.EGL_STENCIL_SIZE) return false;

return true;

}

@Override

public int hashCode() {

int result = EGL_NON_CONFORMANT_CONFIG;

result = 31 * result + EGL_SAMPLES;

result = 31 * result + EGL_STENCIL_SIZE;

result = 31 * result + EGL_DEPTH_SIZE;

result = 31 * result + EGL_ALPHA_SIZE;

result = 31 * result + EGL_BLUE_SIZE;

result = 31 * result + EGL_GREEN_SIZE;

result = 31 * result + EGL_RED_SIZE;

return result;

}

@Override

public String toString() {

// rgba (rgba) depth stencil samples non comfort

return "RGB" + (EGL_ALPHA_SIZE > 0 ? "A" : "") +

" " + (EGL_RED_SIZE + EGL_GREEN_SIZE + EGL_BLUE_SIZE + EGL_ALPHA_SIZE) + " bit" +

" (" + EGL_RED_SIZE + "" + EGL_GREEN_SIZE + EGL_BLUE_SIZE + "" + (EGL_ALPHA_SIZE > 0 ? EGL_ALPHA_SIZE : "") + ")" +

(EGL_DEPTH_SIZE > 0 ? " Depth " + EGL_DEPTH_SIZE + "bit" : "") +

(EGL_STENCIL_SIZE > 0 ? " Stencil " + EGL_STENCIL_SIZE : "") +

(EGL_SAMPLES > 0 ? " Samples x" + EGL_SAMPLES : "") +

(EGL_NON_CONFORMANT_CONFIG > 0 ? " Non-Conformant" : "");

}

// endregion

}

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How To Get Android OpenGL 1.0 and 2.0 Information and Constrains – Revisited