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/*
* Copyright 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
package org.webrtc;
import android.opengl.GLES20;
import android.opengl.GLException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
/**
* Some OpenGL static utility functions.
*/
public class GlUtil {
private GlUtil() {}
public static class GlOutOfMemoryException extends GLException {
public GlOutOfMemoryException(int error, String msg) {
super(error, msg);
}
}
// Assert that no OpenGL ES 2.0 error has been raised.
public static void checkNoGLES2Error(String msg) {
int error = GLES20.glGetError();
if (error != GLES20.GL_NO_ERROR) {
throw error == GLES20.GL_OUT_OF_MEMORY
? new GlOutOfMemoryException(error, msg)
: new GLException(error, msg + ": GLES20 error: " + error);
}
}
public static FloatBuffer createFloatBuffer(float[] coords) {
// Allocate a direct ByteBuffer, using 4 bytes per float, and copy coords into it.
ByteBuffer bb = ByteBuffer.allocateDirect(coords.length * 4);
bb.order(ByteOrder.nativeOrder());
FloatBuffer fb = bb.asFloatBuffer();
fb.put(coords);
fb.position(0);
return fb;
}
/**
* Generate texture with standard parameters.
*/
public static int generateTexture(int target) {
final int textureArray[] = new int[1];
GLES20.glGenTextures(1, textureArray, 0);
final int textureId = textureArray[0];
GLES20.glBindTexture(target, textureId);
GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
checkNoGLES2Error("generateTexture");
return textureId;
}
}
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