/*
* 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 javax.microedition.khronos.opengles.GL10;
import android.graphics.Bitmap;
/**
*
* Utility class to help bridging OpenGL ES and Android APIs.
*
*/
public final class GLUtils {
/*
* We use a class initializer to allow the native code to cache some
* field offsets.
*/
static {
nativeClassInit();
}
private GLUtils() {
}
/**
* 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");
}
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.
* @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");
}
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.
*
* @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 (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.
*
* @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 (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.
*
* @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 (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.
*
* @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");
}
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.
*
* @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 (native_texSubImage2D(target, level, xoffset, yoffset, bitmap, format, type)!=0) {
throw new IllegalArgumentException("invalid Bitmap format");
}
}
native private static void nativeClassInit();
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);
}
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