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

July 17, 2014 / Jan Rabe / 0 Comments

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

}

Enjoy. (:

Android: OpenGL 1.0 and 2.0 infos

January 9, 2014 / Jan Rabe / 1 Comment

So here I was again, trying to figure out a way to get opengl infos like max texture size, max uniform vectors, max vertex attributes, etc. for several android devices. Technically you could just use a small getter:

Log.v("GL_MAX_TEXTURE_UNITS:", glGetIntegerv(GLES10.GL_MAX_TEXTURE_UNITS));

public static int glGetIntegerv(int value) {
  size = IntBuffer.allocate(1);
  GLES10.glGetIntegerv(value, size);
  return size.get(0);
}

Log.v("GL_MAX_TEXTURE_UNITS:", glGetIntegerv(GLES10.GL_MAX_TEXTURE_UNITS));

public static int glGetIntegerv(int value) {

size = IntBuffer.allocate(1);

GLES10.glGetIntegerv(value, size);

return size.get(0);

}

The problem was that on many devices the the returned number would always be 0. That’s because there hasn’t been created an opengl context yet. As suggested on Stackoverflow you could create a GLSurfaceView, add a renderer which could read the required infos by adding the glsurfaceview to the actual main active view and simply remove itself when done. In order to get opengles 1.0 and opengles 2.0 infos you would need to create two surfacesviews with different opengl versions. The following example looks a bit complicated, because I use fragments which i need to update on the main thread after I got all the infos I wanted. A full example is on github.

Android libgdx ShaderAssetLoader & StillModelLoader

May 11, 2013 / Jan Rabe / 0 Comments

I totally love how libgdx brings a lot of interfaces for your application to connect to the graphics library. For instance the asset manager is really thought through well in particular. It has some really useful methods like Assets.manager.getProgress(). Especially since you can easily write your own asset loader and be able to utilize the loading progress in your app.

1) Simply add your loader to the asset manager at some point.

AssetManager manager = new AssetManager();
manager.setLoader( StillModel.class, new StillModelAssetLoader( new InternalFileHandleResolver() ) );
manager.setLoader( ShaderProgram.class, new ShaderAssetLoader( new InternalFileHandleResolver() ) );

AssetManager manager = new AssetManager();

manager.setLoader( StillModel.class, new StillModelAssetLoader( new InternalFileHandleResolver() ) );

manager.setLoader( ShaderProgram.class, new ShaderAssetLoader( new InternalFileHandleResolver() ) );

2) load your assets at required places, e.g. loading screen
(Note: SHADER_PHONG = “data/Graphics/Shader/Phong”; and MODEL_TEAPOT = “data/Graphics/Shader/teapot.obj”)

manager.load( SHADER_PHONG, ShaderProgram.class );
manager.load( MODEL_TEAPOT, StillModel.class );

1 2	manager.load( SHADER_PHONG, ShaderProgram.class ); manager.load( MODEL_TEAPOT, StillModel.class );

3) get your shader or model wherever you need them

ShaderProgram phong = manager.get( SHADER_PHONG, ShaderProgram.class );
StillModel teapotMesh = manager.get( MODEL_TEAPOT, StillModel.class );

1 2	ShaderProgram phong = manager.get( SHADER_PHONG, ShaderProgram.class ); StillModel teapotMesh = manager.get( MODEL_TEAPOT, StillModel.class );

4) free the resource by unloading when you’re done with them (e.g. disposing your app; changing screens)

manager.unload( SHADER_PHONG );
manager.unload( MODEL_TEAPOT);

1 2	manager.unload( SHADER_PHONG ); manager.unload( MODEL_TEAPOT);

That’s the shader asset loader for loading custom shaders in libgdx. (Note: adapt your extensions)

public class ShaderAssetLoader extends SynchronousAssetLoader&lt;ShaderProgram, AssetLoaderParameters&gt; {

    private static final String VERTEX_SHADER_EXTENSION = ".vsh";
    private static final String FRAGMENT_SHADER_EXTENSION = ".fsh";

    public ShaderAssetLoader ( final FileHandleResolver resolver ) {
        super( resolver );
    }

    @Override
    public ShaderProgram load ( final AssetManager assetManager, final String fileName, final AssetLoaderParameters parameter ) {
        final ShaderProgram shader = new ShaderProgram( resolve( fileName + VERTEX_SHADER_EXTENSION ), resolve( fileName + FRAGMENT_SHADER_EXTENSION ) );
        if ( shader.isCompiled() == false ) {
            throw new IllegalStateException( shader.getLog() );
        }
        return shader;
    }

    @Override
    public Array getDependencies ( final String fileName, final AssetLoaderParameters parameter ) {
        return null;
    }
}

public class ShaderAssetLoader extends SynchronousAssetLoader<ShaderProgram, AssetLoaderParameters> {

private static final String VERTEX_SHADER_EXTENSION = ".vsh";

private static final String FRAGMENT_SHADER_EXTENSION = ".fsh";

public ShaderAssetLoader ( final FileHandleResolver resolver ) {

super( resolver );

}

@Override

public ShaderProgram load ( final AssetManager assetManager, final String fileName, final AssetLoaderParameters parameter ) {

final ShaderProgram shader = new ShaderProgram( resolve( fileName + VERTEX_SHADER_EXTENSION ), resolve( fileName + FRAGMENT_SHADER_EXTENSION ) );

if ( shader.isCompiled() == false ) {

throw new IllegalStateException( shader.getLog() );

}

return shader;

}

@Override

public Array getDependencies ( final String fileName, final AssetLoaderParameters parameter ) {

return null;

}

And here is the StillModel loader for loading 3D meshes:

public class StillModelAssetLoader extends SynchronousAssetLoader&lt;StillModel, AssetLoaderParameters&gt; {

    public StillModelAssetLoader ( FileHandleResolver resolver ) {
        super( resolver );
    }

    @Override
    public StillModel load ( AssetManager assetManager, String fileName, AssetLoaderParameters parameter ) {
        return ModelLoaderRegistry.loadStillModel( resolve( fileName ) );
    }

    @Override
    public Array getDependencies ( String fileName, AssetLoaderParameters parameter ) {
        return null;
    }
}

public class StillModelAssetLoader extends SynchronousAssetLoader<StillModel, AssetLoaderParameters> {

public StillModelAssetLoader ( FileHandleResolver resolver ) {

super( resolver );

}

@Override

public StillModel load ( AssetManager assetManager, String fileName, AssetLoaderParameters parameter ) {

return ModelLoaderRegistry.loadStillModel( resolve( fileName ) );

}

@Override

public Array getDependencies ( String fileName, AssetLoaderParameters parameter ) {

return null;

}

Conclusion: assets are handled well in libgdx :D

Android: Saving Screenshots in OpenGLES

May 9, 2013 / Jan Rabe / 2 Comments

1) Get your helper methods:

public static void saveBitmap(@NotNull Bitmap screenshot, @NotNull String filePath, @NotNull String fileName) {
	OutputStream outStream = null;
	filePath = Environment.getExternalStorageDirectory().toString() + "/" + filePath;
	File dir = new File( filePath );
	dir.mkdirs();
	File output = new File( filePath, fileName );
	try {
		outStream = new FileOutputStream( output );
		screenshot.compress( Bitmap.CompressFormat.PNG, 100, outStream );
		outStream.flush();
		outStream.close();
		Logger.v( TAG, "Saving Screenshot [" + filePath + fileName + "]" );
	} catch ( FileNotFoundException e ) {
		Logger.e( TAG, "" + e.getMessage() );
	} catch ( IOException e ) {
		Logger.e( TAG, "" + e.getMessage() );
	}
}

@NotNull
public Bitmap captureScreenShot() {
	int width = Gdx.graphics.getWidth(); // use your favorite width
	int height = Gdx.graphics.getHeight(); // use your favorite height
	int screenshotSize = width * height;
	ByteBuffer bb = ByteBuffer.allocateDirect( screenshotSize * 4 );
	bb.order( ByteOrder.nativeOrder() );
	// any opengl context will do
	Gdx.graphics.getGL20().glReadPixels( 0, 0, width, height, Gdx.graphics.getGL20().GL_RGBA, Gdx.graphics.getGL20().GL_UNSIGNED_BYTE, bb );
	int pixelsBuffer[] = new int[screenshotSize];
	bb.asIntBuffer().get( pixelsBuffer );
	bb = null;
	Bitmap bitmap = Bitmap.createBitmap( width, height, Bitmap.Config.RGB_565 );
	bitmap.setPixels( pixelsBuffer, screenshotSize - width, -width, 0, 0, width, height );
	pixelsBuffer = null;

	short sBuffer[] = new short[screenshotSize];
	ShortBuffer sb = ShortBuffer.wrap( sBuffer );
	bitmap.copyPixelsToBuffer( sb );

	//Making created bitmap (from OpenGL points) compatible with Android bitmap
	for ( int i = 0; i &lt; screenshotSize; ++i ) {
		short v = sBuffer[i];
		sBuffer[i] = ( short ) ( ( ( v &amp; 0x1f ) &lt;&lt; 11 ) | ( v &amp; 0x7e0 ) | ( ( v &amp; 0xf800 ) &gt;&gt; 11 ) );
	}
	sb.rewind();
	bitmap.copyPixelsFromBuffer( sb );
	return bitmap;
}

@Override
public void captureScreenShot(@NotNull final String path, @NotNull final String fileName) {
	Bitmap screenshot = captureScreenShot();
	saveBitmap( screenshot, path, fileName );
	screenshot.recycle();
}

public static void saveBitmap(@NotNull Bitmap screenshot, @NotNull String filePath, @NotNull String fileName) {

OutputStream outStream = null;

filePath = Environment.getExternalStorageDirectory().toString() + "/" + filePath;

File dir = new File( filePath );

dir.mkdirs();

File output = new File( filePath, fileName );

try {

outStream = new FileOutputStream( output );

screenshot.compress( Bitmap.CompressFormat.PNG, 100, outStream );

outStream.flush();

outStream.close();

Logger.v( TAG, "Saving Screenshot [" + filePath + fileName + "]" );

} catch ( FileNotFoundException e ) {

Logger.e( TAG, "" + e.getMessage() );

} catch ( IOException e ) {

Logger.e( TAG, "" + e.getMessage() );

}

@NotNull

public Bitmap captureScreenShot() {

int width = Gdx.graphics.getWidth(); // use your favorite width

int height = Gdx.graphics.getHeight(); // use your favorite height

int screenshotSize = width * height;

ByteBuffer bb = ByteBuffer.allocateDirect( screenshotSize * 4 );

bb.order( ByteOrder.nativeOrder() );

// any opengl context will do

Gdx.graphics.getGL20().glReadPixels( 0, 0, width, height, Gdx.graphics.getGL20().GL_RGBA, Gdx.graphics.getGL20().GL_UNSIGNED_BYTE, bb );

int pixelsBuffer[] = new int[screenshotSize];

bb.asIntBuffer().get( pixelsBuffer );

bb = null;

Bitmap bitmap = Bitmap.createBitmap( width, height, Bitmap.Config.RGB_565 );

bitmap.setPixels( pixelsBuffer, screenshotSize - width, -width, 0, 0, width, height );

pixelsBuffer = null;

short sBuffer[] = new short[screenshotSize];

ShortBuffer sb = ShortBuffer.wrap( sBuffer );

bitmap.copyPixelsToBuffer( sb );

//Making created bitmap (from OpenGL points) compatible with Android bitmap

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

short v = sBuffer[i];

sBuffer[i] = ( short ) ( ( ( v & 0x1f ) << 11 ) | ( v & 0x7e0 ) | ( ( v & 0xf800 ) >> 11 ) );

}

sb.rewind();

bitmap.copyPixelsFromBuffer( sb );

return bitmap;

}

@Override

public void captureScreenShot(@NotNull final String path, @NotNull final String fileName) {

Bitmap screenshot = captureScreenShot();

saveBitmap( screenshot, path, fileName );

screenshot.recycle();

}

2) get a queue ready

protected ConcurrentLinkedQueue screenshotRequestedQueue = new ConcurrentLinkedQueue&lt;&gt;();

1	protected ConcurrentLinkedQueue screenshotRequestedQueue = new ConcurrentLinkedQueue<>();

3) add new filepath the the queue via e.g. events:

@Override
public boolean tap(float x, float y, int count, int button) {
	screenshotRequestedQueue.add( Math.random() * Integer.MAX_VALUE + ".png" );
	return false;
}

@Override

public boolean tap(float x, float y, int count, int button) {

screenshotRequestedQueue.add( Math.random() * Integer.MAX_VALUE + ".png" );

return false;

}

4) IMPORTANT! save the screen at the end of the opengl render process. (Note: If try to capture somewhere in the middle you might end up with a black screen or any other funny effects.)

@Override
public void render(float delta) {

	...
	// render your stuff
	...

	// capture screen on request
	if ( !screenshotRequestedQueue.isEmpty() )
		captureScreenShot(SCREENSHOT_FOLDER, screenshotRequestedQueue.poll() );
}

@Override

public void render(float delta) {

...

// render your stuff

...

// capture screen on request

if ( !screenshotRequestedQueue.isEmpty() )

captureScreenShot(SCREENSHOT_FOLDER, screenshotRequestedQueue.poll() );

}

WebGL: Three.js and particles from black and white shape

January 30, 2013 / Jan Rabe / 0 Comments

Well Three.js is amazing:

Just adapted the black and white shape image to this Particle Shape Tween. Which basically replaces the shape with particles.
kibotu

WebGL: Earth Texture Shader

December 29, 2012 / Jan Rabe / 0 Comments

At university my computer graphic professor Hartmut Schirmacher gave us an excercise to implement various effects on a sphere in webgl with shaders based on his given webgl framework. His framework made it fairly easy though. Well here it is:

The features are:

Day and night light with smooth transition
Day changes based on the month
Moving clouds, which alternate in intensity over time
Wireframe and equator ring for orientation purposes
Specular lights based on barythmetic map
Height based on topyographic map
~~Bump map~~ (work in progress)
Rotate with [Left click]
Drag with [Shift] + [Left click]
Zoom with [Alt] + [Left click]

All textures are taken from NASA’s Blue Marble collection.

This is my solution to cg2 exercersise a03.

WebGL: Robot

December 29, 2012 / Jan Rabe / 0 Comments

Another lovely javascript excerise. Just uncheck the animation to control it better.

This is my solution to cg2 exercersise a02.5-2.6.

WebGL: Backface Culling and Depth Test

December 29, 2012 / Jan Rabe / 0 Comments

One interesting part is the z-fighting, which doesn’t happen with polygon offset fill.

gl.polygonOffset(0.1, 0.1);
gl.enable(gl.POLYGON_OFFSET_FILL);
gl.drawElements(gl.TRIANGLES, this.indexBuffer.numIndices(), gl.UNSIGNED_SHORT, 0);
gl.disable(gl.POLYGON_OFFSET_FILL);

gl.polygonOffset(0.1, 0.1);

gl.enable(gl.POLYGON_OFFSET_FILL);

gl.drawElements(gl.TRIANGLES, this.indexBuffer.numIndices(), gl.UNSIGNED_SHORT, 0);

gl.disable(gl.POLYGON_OFFSET_FILL);

This is my solution to cg2 exercersise a02.1-2.4.

WebGL: warmup

December 29, 2012 / Jan Rabe / 0 Comments

What are the pros/cons of WebGL?
Read Quote of Henrik Bennetsen’s answer to What are the pros/cons of WebGL? on Quora

This is my “solution” to cg2 exercersise a00-warmup.

Shader to software skinning method conversation

December 17, 2012 / Jan Rabe / 3 Comments

An almost monolog on stackoverflow helped me to get skeleton animations at least usably working in render demo that I’ve put up in android market. By the way on how the shader computes mat4 * vec4 can be found in the opengles shading language specification.

All right I’ve got a mesh with around 8000+ vertices, it’s sekelon with up to 128 bones and all it’s bone keyframe transformations up to 400 each animation.

Ahri Skeleton

Ahri Mesh

On desktop I could use this in vertex shader in order to compute the skinning:

...
uniform mat4  u_BoneTransform[128];
in  vec3  in_Position;
in  vec3  in_Normal;
in  vec4  in_BoneID;
in  vec4  in_Weights;
...
void main(void) { 

    vec3 position = (in_Weights[0] * (u_BoneTransform[ int(in_BoneID[0]) ] * vec4(in_Position, 1.0)).xyz)+
                    (in_Weights[1] * (u_BoneTransform[ int(in_BoneID[1]) ] * vec4(in_Position, 1.0)).xyz)+
                    (in_Weights[2] * (u_BoneTransform[ int(in_BoneID[2]) ] * vec4(in_Position, 1.0)).xyz)+
                    (in_Weights[3] * (u_BoneTransform[ int(in_BoneID[3]) ] * vec4(in_Position, 1.0)).xyz);

    vec3 normal =   (in_Weights[0] * (u_BoneTransform[ int(in_BoneID[0]) ] * vec4(in_Normal, 0.0)).xyz) +
                    (in_Weights[1] * (u_BoneTransform[ int(in_BoneID[1]) ] * vec4(in_Normal, 0.0)).xyz) +
                    (in_Weights[2] * (u_BoneTransform[ int(in_BoneID[2]) ] * vec4(in_Normal, 0.0)).xyz) +
                    (in_Weights[3] * (u_BoneTransform[ int(in_BoneID[3]) ] * vec4(in_Normal, 0.0)).xyz);
    ...
}

...

uniform mat4 u_BoneTransform[128];

in vec3 in_Position;

in vec3 in_Normal;

in vec4 in_BoneID;

in vec4 in_Weights;

...

void main(void) {

vec3 position = (in_Weights[0] * (u_BoneTransform[ int(in_BoneID[0]) ] * vec4(in_Position, 1.0)).xyz)+

(in_Weights[1] * (u_BoneTransform[ int(in_BoneID[1]) ] * vec4(in_Position, 1.0)).xyz)+

(in_Weights[2] * (u_BoneTransform[ int(in_BoneID[2]) ] * vec4(in_Position, 1.0)).xyz)+

(in_Weights[3] * (u_BoneTransform[ int(in_BoneID[3]) ] * vec4(in_Position, 1.0)).xyz);

vec3 normal = (in_Weights[0] * (u_BoneTransform[ int(in_BoneID[0]) ] * vec4(in_Normal, 0.0)).xyz) +

(in_Weights[1] * (u_BoneTransform[ int(in_BoneID[1]) ] * vec4(in_Normal, 0.0)).xyz) +

(in_Weights[2] * (u_BoneTransform[ int(in_BoneID[2]) ] * vec4(in_Normal, 0.0)).xyz) +

(in_Weights[3] * (u_BoneTransform[ int(in_BoneID[3]) ] * vec4(in_Normal, 0.0)).xyz);

...

}

As you can see there are a lot of bones. On android I don’t have the luxury of wasting variables to make simple lookups. I’d need 128 mat4 * 4 vec4 = 512 shader uniform vector variables and my samsung galaxy s2 only supports 304. Anyway I can think of 2 solutions:

divide the mesh into an ‘ok’ amount of bones and render the mesh with less bone matrices
do the skinning in software and update the vertex/normal buffers

I’d prefer the first solution, because I’d have to update merely the bone matrices uniform each frame instead of the entire vertex buffer. At this point however I have no idea how to divide the mesh because each vertex can have up to 4 bone influences and so I implemented the 2nd choice for now. Work in progress…

Here is the equivalent java code:

/**
 * skinning
 * @param w weights ==  in_Weights
 * @param i bone influence indices == in_BoneID
 * @param m bone transformation matrix == u_BoneTransform[128]
 * @param t target vector == in_Position
 * @param f flag 1 == in_Position, 0 == in_Normal
 */
public static void marryBonesWithVector(float[] w, int[] i, Matrix4[] m, Vector3 t, float f) {
    t.set(
            // x influence for bone 1
            w[0] * (m[i[0]].values[0] * t.x + m[i[0]].values[4] * t.y + m[i[0]].values[8] * t.z + m[i[0]].values[12] * f) +
            // x influence for bone 2
            w[1] * (m[i[1]].values[0] * t.x + m[i[1]].values[4] * t.y + m[i[1]].values[8] * t.z + m[i[1]].values[12] * f) +
            // x influence for bone 3
            w[2] * (m[i[2]].values[0] * t.x + m[i[2]].values[4] * t.y + m[i[2]].values[8] * t.z + m[i[2]].values[12] * f) +
            // x influence for bone 4
            w[3] * (m[i[3]].values[0] * t.x + m[i[3]].values[4] * t.y + m[i[3]].values[8] * t.z + m[i[3]].values[12] * f),

            // y influence for bone 1
            w[0] * (m[i[0]].values[1] * t.x + m[i[0]].values[5] * t.y + m[i[0]].values[9] * t.z + m[i[0]].values[13] * f) +
            // y influence for bone 2
            w[1] * (m[i[1]].values[1] * t.x + m[i[1]].values[5] * t.y + m[i[1]].values[9] * t.z + m[i[1]].values[13] * f) +
            // y influence for bone 3
            w[2] * (m[i[2]].values[1] * t.x + m[i[2]].values[5] * t.y + m[i[2]].values[9] * t.z + m[i[2]].values[13] * f) +
            // y influence for bone 4
            w[3] * (m[i[3]].values[1] * t.x + m[i[3]].values[5] * t.y + m[i[3]].values[9] * t.z + m[i[3]].values[13] * f),

            // z influence for bone 1
            w[0] * (m[i[0]].values[2] * t.x + m[i[0]].values[6] * t.y + m[i[0]].values[10] * t.z + m[i[0]].values[14] * f) +
            // z influence for bone 1
            w[1] * (m[i[1]].values[2] * t.x + m[i[1]].values[6] * t.y + m[i[1]].values[10] * t.z + m[i[1]].values[14] * f) +
            // z influence for bone 1
            w[2] * (m[i[2]].values[2] * t.x + m[i[2]].values[6] * t.y + m[i[2]].values[10] * t.z + m[i[2]].values[14] * f) +
            // z influence for bone 1
            w[3] * (m[i[3]].values[2] * t.x + m[i[3]].values[6] * t.y + m[i[3]].values[10] * t.z + m[i[3]].values[14] * f)
    );
}

/**

* skinning

* @param w weights == in_Weights

* @param i bone influence indices == in_BoneID

* @param m bone transformation matrix == u_BoneTransform[128]

* @param t target vector == in_Position

* @param f flag 1 == in_Position, 0 == in_Normal

public static void marryBonesWithVector(float[] w, int[] i, Matrix4[] m, Vector3 t, float f) {

t.set(

// x influence for bone 1

w[0] * (m[i[0]].values[0] * t.x + m[i[0]].values[4] * t.y + m[i[0]].values[8] * t.z + m[i[0]].values[12] * f) +

// x influence for bone 2

w[1] * (m[i[1]].values[0] * t.x + m[i[1]].values[4] * t.y + m[i[1]].values[8] * t.z + m[i[1]].values[12] * f) +

// x influence for bone 3

w[2] * (m[i[2]].values[0] * t.x + m[i[2]].values[4] * t.y + m[i[2]].values[8] * t.z + m[i[2]].values[12] * f) +

// x influence for bone 4

w[3] * (m[i[3]].values[0] * t.x + m[i[3]].values[4] * t.y + m[i[3]].values[8] * t.z + m[i[3]].values[12] * f),

// y influence for bone 1

w[0] * (m[i[0]].values[1] * t.x + m[i[0]].values[5] * t.y + m[i[0]].values[9] * t.z + m[i[0]].values[13] * f) +

// y influence for bone 2

w[1] * (m[i[1]].values[1] * t.x + m[i[1]].values[5] * t.y + m[i[1]].values[9] * t.z + m[i[1]].values[13] * f) +

// y influence for bone 3

w[2] * (m[i[2]].values[1] * t.x + m[i[2]].values[5] * t.y + m[i[2]].values[9] * t.z + m[i[2]].values[13] * f) +

// y influence for bone 4

w[3] * (m[i[3]].values[1] * t.x + m[i[3]].values[5] * t.y + m[i[3]].values[9] * t.z + m[i[3]].values[13] * f),

// z influence for bone 1

w[0] * (m[i[0]].values[2] * t.x + m[i[0]].values[6] * t.y + m[i[0]].values[10] * t.z + m[i[0]].values[14] * f) +

// z influence for bone 1

w[1] * (m[i[1]].values[2] * t.x + m[i[1]].values[6] * t.y + m[i[1]].values[10] * t.z + m[i[1]].values[14] * f) +

// z influence for bone 1

w[2] * (m[i[2]].values[2] * t.x + m[i[2]].values[6] * t.y + m[i[2]].values[10] * t.z + m[i[2]].values[14] * f) +

// z influence for bone 1

w[3] * (m[i[3]].values[2] * t.x + m[i[3]].values[6] * t.y + m[i[3]].values[10] * t.z + m[i[3]].values[14] * f)

);

}

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