Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2016 nekocode
 *
 * 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.
 */

import android.content.Context;
import android.content.res.Resources;

import android.opengl.GLES20;

import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class Main {
    private static final String TAG = "MyGLUtils";

    public static int buildProgram(Context context, int vertexSourceRawId, int fragmentSourceRawId) {
        return buildProgram(getStringFromRaw(context, vertexSourceRawId),
                getStringFromRaw(context, fragmentSourceRawId));
    }

    public static int buildProgram(String vertexSource, String fragmentSource) {
        final int vertexShader = buildShader(GLES20.GL_VERTEX_SHADER, vertexSource);
        if (vertexShader == 0) {
            return 0;
        }

        final int fragmentShader = buildShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
        if (fragmentShader == 0) {
            return 0;
        }

        final int program = GLES20.glCreateProgram();
        if (program == 0) {
            return 0;
        }

        GLES20.glAttachShader(program, vertexShader);
        GLES20.glAttachShader(program, fragmentShader);
        GLES20.glLinkProgram(program);

        return program;
    }

    private static String getStringFromRaw(Context context, int id) {
        String str;
        try {
            Resources r = context.getResources();
            InputStream is = r.openRawResource(id);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            int i = is.read();
            while (i != -1) {
                baos.write(i);
                i = is.read();
            }

            str = baos.toString();
            is.close();
        } catch (IOException e) {
            str = "";
        }

        return str;
    }

    public static int buildShader(int type, String shaderSource) {
        final int shader = GLES20.glCreateShader(type);
        if (shader == 0) {
            return 0;
        }

        GLES20.glShaderSource(shader, shaderSource);
        GLES20.glCompileShader(shader);

        int[] status = new int[1];
        GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, status, 0);
        if (status[0] == 0) {
            Log.e(TAG, GLES20.glGetShaderInfoLog(shader));
            GLES20.glDeleteShader(shader);
            return 0;
        }

        return shader;
    }
}