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Magnus Jedvert80cf97c2015-06-11 10:08:59 +02001/*
kjellanderb24317b2016-02-10 07:54:43 -08002 * Copyright 2015 The WebRTC project authors. All Rights Reserved.
Magnus Jedvert80cf97c2015-06-11 10:08:59 +02003 *
kjellanderb24317b2016-02-10 07:54:43 -08004 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
Magnus Jedvert80cf97c2015-06-11 10:08:59 +02009 */
10
11package org.webrtc;
12
13import android.opengl.GLES20;
Magnus Jedvert80cf97c2015-06-11 10:08:59 +020014
15import java.nio.ByteBuffer;
16import java.nio.ByteOrder;
17import java.nio.FloatBuffer;
18
19/**
20 * Some OpenGL static utility functions.
21 */
22public class GlUtil {
Magnus Jedvert80cf97c2015-06-11 10:08:59 +020023 private GlUtil() {}
24
Magnus Jedvertecae9cd2019-07-05 14:33:12 +020025 public static class GlOutOfMemoryException extends RuntimeException {
26 public GlOutOfMemoryException(String msg) {
27 super(msg);
28 }
29 }
30
Magnus Jedvert80cf97c2015-06-11 10:08:59 +020031 // Assert that no OpenGL ES 2.0 error has been raised.
32 public static void checkNoGLES2Error(String msg) {
33 int error = GLES20.glGetError();
34 if (error != GLES20.GL_NO_ERROR) {
Magnus Jedvertecae9cd2019-07-05 14:33:12 +020035 throw error == GLES20.GL_OUT_OF_MEMORY
36 ? new GlOutOfMemoryException(msg)
37 : new RuntimeException(msg + ": GLES20 error: " + error);
Magnus Jedvert80cf97c2015-06-11 10:08:59 +020038 }
39 }
40
41 public static FloatBuffer createFloatBuffer(float[] coords) {
42 // Allocate a direct ByteBuffer, using 4 bytes per float, and copy coords into it.
43 ByteBuffer bb = ByteBuffer.allocateDirect(coords.length * 4);
44 bb.order(ByteOrder.nativeOrder());
45 FloatBuffer fb = bb.asFloatBuffer();
46 fb.put(coords);
47 fb.position(0);
48 return fb;
49 }
Magnus Jedvert1a591dd2015-09-02 14:43:03 +020050
51 /**
52 * Generate texture with standard parameters.
53 */
54 public static int generateTexture(int target) {
55 final int textureArray[] = new int[1];
56 GLES20.glGenTextures(1, textureArray, 0);
57 final int textureId = textureArray[0];
58 GLES20.glBindTexture(target, textureId);
59 GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
60 GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
61 GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
62 GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
63 checkNoGLES2Error("generateTexture");
64 return textureId;
65 }
Magnus Jedvert80cf97c2015-06-11 10:08:59 +020066}