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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.mediafx;
     18 
     19 import android.opengl.GLES20;
     20 
     21 public class GLToolbox {
     22 
     23     public static int loadShader(int shaderType, String source) {
     24         int shader = GLES20.glCreateShader(shaderType);
     25         if (shader != 0) {
     26             GLES20.glShaderSource(shader, source);
     27             GLES20.glCompileShader(shader);
     28             int[] compiled = new int[1];
     29             GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
     30             if (compiled[0] == 0) {
     31                 String info = GLES20.glGetShaderInfoLog(shader);
     32                 GLES20.glDeleteShader(shader);
     33                 shader = 0;
     34                 throw new RuntimeException("Could not compile shader " +
     35                 shaderType + ":" + info);
     36             }
     37         }
     38         return shader;
     39     }
     40 
     41     public static int createProgram(String vertexSource,
     42             String fragmentSource) {
     43         int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
     44         if (vertexShader == 0) {
     45             return 0;
     46         }
     47         int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
     48         if (pixelShader == 0) {
     49             return 0;
     50         }
     51 
     52         int program = GLES20.glCreateProgram();
     53         if (program != 0) {
     54             GLES20.glAttachShader(program, vertexShader);
     55             checkGlError("glAttachShader");
     56             GLES20.glAttachShader(program, pixelShader);
     57             checkGlError("glAttachShader");
     58             GLES20.glLinkProgram(program);
     59             int[] linkStatus = new int[1];
     60             GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus,
     61                     0);
     62             if (linkStatus[0] != GLES20.GL_TRUE) {
     63                 String info = GLES20.glGetProgramInfoLog(program);
     64                 GLES20.glDeleteProgram(program);
     65                 program = 0;
     66                 throw new RuntimeException("Could not link program: " + info);
     67             }
     68         }
     69         return program;
     70     }
     71 
     72     public static void checkGlError(String op) {
     73         int error;
     74         while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
     75             throw new RuntimeException(op + ": glError " + error);
     76         }
     77     }
     78 
     79     public static void initTexParams() {
     80         GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
     81                 GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
     82         GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
     83                 GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
     84         GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
     85                 GLES20.GL_CLAMP_TO_EDGE);
     86         GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
     87                 GLES20.GL_CLAMP_TO_EDGE);
     88    }
     89 
     90 }
     91