https://source.android.com/ 
/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.opengl;

import android.graphics.Bitmap;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGL11;


Utility class to help bridging OpenGL ES and Android APIs.

/**
 *
 * Utility class to help bridging OpenGL ES and Android APIs.
 *
 */

public final class GLUtils {

    private GLUtils() {
    }

    
return the internal format as defined by OpenGL ES of the supplied bitmap.

Params:
  • bitmap – 
Returns:the internal format of the bitmap.
/**
     * return the internal format as defined by OpenGL ES of the supplied bitmap.
     * @param bitmap
     * @return the internal format of the bitmap.
     */
    public static int getInternalFormat(Bitmap bitmap) {
        if (bitmap == null) {
            throw new NullPointerException("getInternalFormat can't be used with a null Bitmap");
        }
        if (bitmap.isRecycled()) {
            throw new IllegalArgumentException("bitmap is recycled");
        }
        int result = native_getInternalFormat(bitmap);
        if (result < 0) {
            throw new IllegalArgumentException("Unknown internalformat");
        }
        return result;
    }

    
Return the type as defined by OpenGL ES of the supplied bitmap, if there
is one. If the bitmap is stored in a compressed format, it may not have
a valid OpenGL ES type.

Params:
  • bitmap – 
Throws:
  • IllegalArgumentException – if the bitmap does not have a type.
Returns:the OpenGL ES type of the bitmap.
/**
     * Return the type as defined by OpenGL ES of the supplied bitmap, if there
     * is one. If the bitmap is stored in a compressed format, it may not have
     * a valid OpenGL ES type.
     * @throws IllegalArgumentException if the bitmap does not have a type.
     * @param bitmap
     * @return the OpenGL ES type of the bitmap.
     */
    public static int getType(Bitmap bitmap) {
        if (bitmap == null) {
            throw new NullPointerException("getType can't be used with a null Bitmap");
        }
        if (bitmap.isRecycled()) {
            throw new IllegalArgumentException("bitmap is recycled");
        }
        int result = native_getType(bitmap);
        if (result < 0) {
            throw new IllegalArgumentException("Unknown type");
        }
        return result;
    }

    
Calls glTexImage2D() on the current OpenGL context. If no context is
current the behavior is the same as calling glTexImage2D() with  no
current context, that is, eglGetError() will return the appropriate
error.
Unlike glTexImage2D() bitmap cannot be null and will raise an exception
in that case.
All other parameters are identical to those used for glTexImage2D().
NOTE: this method doesn't change GL_UNPACK_ALIGNMENT, you must make
sure to set it properly according to the supplied bitmap.
Whether or not bitmap can have non power of two dimensions depends on
the current OpenGL context. Always check glGetError() some time
after calling this method, just like when using OpenGL directly.

Params:
  • target – 
  • level – 
  • internalformat – 
  • bitmap – 
  • border – 
/**
     * Calls glTexImage2D() on the current OpenGL context. If no context is
     * current the behavior is the same as calling glTexImage2D() with  no
     * current context, that is, eglGetError() will return the appropriate
     * error.
     * Unlike glTexImage2D() bitmap cannot be null and will raise an exception
     * in that case.
     * All other parameters are identical to those used for glTexImage2D().
     *
     * NOTE: this method doesn't change GL_UNPACK_ALIGNMENT, you must make
     * sure to set it properly according to the supplied bitmap.
     *
     * Whether or not bitmap can have non power of two dimensions depends on
     * the current OpenGL context. Always check glGetError() some time
     * after calling this method, just like when using OpenGL directly.
     *
     * @param target
     * @param level
     * @param internalformat
     * @param bitmap
     * @param border
     */
    public static void texImage2D(int target, int level, int internalformat,
            Bitmap bitmap, int border) {
        if (bitmap == null) {
            throw new NullPointerException("texImage2D can't be used with a null Bitmap");
        }
        if (bitmap.isRecycled()) {
            throw new IllegalArgumentException("bitmap is recycled");
        }
        if (native_texImage2D(target, level, internalformat, bitmap, -1, border)!=0) {
            throw new IllegalArgumentException("invalid Bitmap format");
        }
    }

    
A version of texImage2D() that takes an explicit type parameter
as defined by the OpenGL ES specification. The actual type and
internalformat of the bitmap must be compatible with the specified
type and internalformat parameters.

Params:
  • target – 
  • level – 
  • internalformat – 
  • bitmap – 
  • type – 
  • border – 
/**
     * A version of texImage2D() that takes an explicit type parameter
     * as defined by the OpenGL ES specification. The actual type and
     * internalformat of the bitmap must be compatible with the specified
     * type and internalformat parameters.
     *
     * @param target
     * @param level
     * @param internalformat
     * @param bitmap
     * @param type
     * @param border
     */
    public static void texImage2D(int target, int level, int internalformat,
            Bitmap bitmap, int type, int border) {
        if (bitmap == null) {
            throw new NullPointerException("texImage2D can't be used with a null Bitmap");
        }
        if (bitmap.isRecycled()) {
            throw new IllegalArgumentException("bitmap is recycled");
        }
        if (native_texImage2D(target, level, internalformat, bitmap, type, border)!=0) {
            throw new IllegalArgumentException("invalid Bitmap format");
        }
    }

    
A version of texImage2D that determines the internalFormat and type
automatically.

Params:
  • target – 
  • level – 
  • bitmap – 
  • border – 
/**
     * A version of texImage2D that determines the internalFormat and type
     * automatically.
     *
     * @param target
     * @param level
     * @param bitmap
     * @param border
     */
    public static void texImage2D(int target, int level, Bitmap bitmap,
            int border) {
        if (bitmap == null) {
            throw new NullPointerException("texImage2D can't be used with a null Bitmap");
        }
        if (bitmap.isRecycled()) {
            throw new IllegalArgumentException("bitmap is recycled");
        }
        if (native_texImage2D(target, level, -1, bitmap, -1, border)!=0) {
            throw new IllegalArgumentException("invalid Bitmap format");
        }
    }

    
Calls glTexSubImage2D() on the current OpenGL context. If no context is
current the behavior is the same as calling glTexSubImage2D() with  no
current context, that is, eglGetError() will return the appropriate
error.
Unlike glTexSubImage2D() bitmap cannot be null and will raise an exception
in that case.
All other parameters are identical to those used for glTexSubImage2D().
NOTE: this method doesn't change GL_UNPACK_ALIGNMENT, you must make
sure to set it properly according to the supplied bitmap.
Whether or not bitmap can have non power of two dimensions depends on
the current OpenGL context. Always check glGetError() some time
after calling this method, just like when using OpenGL directly.

Params:
  • target – 
  • level – 
  • xoffset – 
  • yoffset – 
  • bitmap – 
/**
     * Calls glTexSubImage2D() on the current OpenGL context. If no context is
     * current the behavior is the same as calling glTexSubImage2D() with  no
     * current context, that is, eglGetError() will return the appropriate
     * error.
     * Unlike glTexSubImage2D() bitmap cannot be null and will raise an exception
     * in that case.
     * All other parameters are identical to those used for glTexSubImage2D().
     *
     * NOTE: this method doesn't change GL_UNPACK_ALIGNMENT, you must make
     * sure to set it properly according to the supplied bitmap.
     *
     * Whether or not bitmap can have non power of two dimensions depends on
     * the current OpenGL context. Always check glGetError() some time
     * after calling this method, just like when using OpenGL directly.
     *
     * @param target
     * @param level
     * @param xoffset
     * @param yoffset
     * @param bitmap
     */
    public static void texSubImage2D(int target, int level, int xoffset, int yoffset,
            Bitmap bitmap) {
        if (bitmap == null) {
            throw new NullPointerException("texSubImage2D can't be used with a null Bitmap");
        }
        if (bitmap.isRecycled()) {
            throw new IllegalArgumentException("bitmap is recycled");
        }
        int type = getType(bitmap);
        if (native_texSubImage2D(target, level, xoffset, yoffset, bitmap, -1, type)!=0) {
            throw new IllegalArgumentException("invalid Bitmap format");
        }
    }

    
A version of texSubImage2D() that takes an explicit type parameter
as defined by the OpenGL ES specification.

Params:
  • target – 
  • level – 
  • xoffset – 
  • yoffset – 
  • bitmap – 
  • type – 
/**
     * A version of texSubImage2D() that takes an explicit type parameter
     * as defined by the OpenGL ES specification.
     *
     * @param target
     * @param level
     * @param xoffset
     * @param yoffset
     * @param bitmap
     * @param type
     */
    public static void texSubImage2D(int target, int level, int xoffset, int yoffset,
            Bitmap bitmap, int format, int type) {
        if (bitmap == null) {
            throw new NullPointerException("texSubImage2D can't be used with a null Bitmap");
        }
        if (bitmap.isRecycled()) {
            throw new IllegalArgumentException("bitmap is recycled");
        }
        if (native_texSubImage2D(target, level, xoffset, yoffset, bitmap, format, type)!=0) {
            throw new IllegalArgumentException("invalid Bitmap format");
        }
    }

    
Return a string for the EGL error code, or the hex representation
if the error is unknown.

Params:
  • error – The EGL error to convert into a String.
Returns:An error string corresponding to the EGL error code.
/**
     * Return a string for the EGL error code, or the hex representation
     * if the error is unknown.
     *
     * @param error The EGL error to convert into a String.
     *
     * @return An error string corresponding to the EGL error code.
     */
    public static String getEGLErrorString(int error) {
        switch (error) {
            case EGL10.EGL_SUCCESS:
                return "EGL_SUCCESS";
            case EGL10.EGL_NOT_INITIALIZED:
                return "EGL_NOT_INITIALIZED";
            case EGL10.EGL_BAD_ACCESS:
                return "EGL_BAD_ACCESS";
            case EGL10.EGL_BAD_ALLOC:
                return "EGL_BAD_ALLOC";
            case EGL10.EGL_BAD_ATTRIBUTE:
                return "EGL_BAD_ATTRIBUTE";
            case EGL10.EGL_BAD_CONFIG:
                return "EGL_BAD_CONFIG";
            case EGL10.EGL_BAD_CONTEXT:
                return "EGL_BAD_CONTEXT";
            case EGL10.EGL_BAD_CURRENT_SURFACE:
                return "EGL_BAD_CURRENT_SURFACE";
            case EGL10.EGL_BAD_DISPLAY:
                return "EGL_BAD_DISPLAY";
            case EGL10.EGL_BAD_MATCH:
                return "EGL_BAD_MATCH";
            case EGL10.EGL_BAD_NATIVE_PIXMAP:
                return "EGL_BAD_NATIVE_PIXMAP";
            case EGL10.EGL_BAD_NATIVE_WINDOW:
                return "EGL_BAD_NATIVE_WINDOW";
            case EGL10.EGL_BAD_PARAMETER:
                return "EGL_BAD_PARAMETER";
            case EGL10.EGL_BAD_SURFACE:
                return "EGL_BAD_SURFACE";
            case EGL11.EGL_CONTEXT_LOST:
                return "EGL_CONTEXT_LOST";
            default:
                return "0x" + Integer.toHexString(error);
        }
    }

    native private static int native_getInternalFormat(Bitmap bitmap);
    native private static int native_getType(Bitmap bitmap);
    native private static int native_texImage2D(int target, int level, int internalformat,
            Bitmap bitmap, int type, int border);
    native private static int native_texSubImage2D(int target, int level, int xoffset, int yoffset,
            Bitmap bitmap, int format, int type);
}