| /* |
| * Copyright (C) 2019 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.gameperformance; |
| |
| import android.annotation.NonNull; |
| import android.content.Context; |
| import android.graphics.BitmapFactory; |
| import android.opengl.GLES20; |
| import android.opengl.GLUtils; |
| import android.util.Log; |
| |
| /** |
| * Helper class for OpenGL. |
| */ |
| public class OpenGLUtils { |
| private final static String TAG = "OpenGLUtils"; |
| |
| public static void checkGlError(String glOperation) { |
| final int error = GLES20.glGetError(); |
| if (error == GLES20.GL_NO_ERROR) { |
| return; |
| } |
| final String errorMessage = glOperation + ": glError " + error; |
| Log.e(TAG, errorMessage); |
| } |
| |
| public static int loadShader(int type, String shaderCode) { |
| final int shader = GLES20.glCreateShader(type); |
| checkGlError("createShader"); |
| |
| GLES20.glShaderSource(shader, shaderCode); |
| checkGlError("shaderSource"); |
| GLES20.glCompileShader(shader); |
| checkGlError("shaderCompile"); |
| |
| return shader; |
| } |
| |
| public static int createProgram(@NonNull String vertexShaderCode, |
| @NonNull String fragmentShaderCode) { |
| final int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode); |
| final int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode); |
| |
| final int program = GLES20.glCreateProgram(); |
| checkGlError("createProgram"); |
| GLES20.glAttachShader(program, vertexShader); |
| checkGlError("attachVertexShader"); |
| GLES20.glAttachShader(program, fragmentShader); |
| checkGlError("attachFragmentShader"); |
| GLES20.glLinkProgram(program); |
| checkGlError("linkProgram"); |
| |
| return program; |
| } |
| |
| public static int createTexture(@NonNull Context context, int resource) { |
| final BitmapFactory.Options options = new BitmapFactory.Options(); |
| options.inScaled = false; |
| |
| final int[] textureHandle = new int[1]; |
| GLES20.glGenTextures(1, textureHandle, 0); |
| OpenGLUtils.checkGlError("GenTextures"); |
| final int handle = textureHandle[0]; |
| |
| GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, handle); |
| GLES20.glTexParameteri( |
| GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR); |
| GLES20.glTexParameteri( |
| GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR); |
| GLUtils.texImage2D( |
| GLES20.GL_TEXTURE_2D, |
| 0, |
| BitmapFactory.decodeResource( |
| context.getResources(), resource, options), |
| 0); |
| |
| return handle; |
| } |
| } |