Method that load a fragment shader and returns its handler identifier for OpenGL. - Android android.opengl

Android examples for android.opengl:OpenGL Shader

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Description

Method that load a fragment shader and returns its handler identifier for OpenGL.

Demo Code

/*//  w  w w .  ja  v a 2 s. c om
 * Copyright (C) 2014 Jorge Ruesga
 *
 * 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.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Rect;
import android.media.effect.Effect;
import android.opengl.GLES20;
import android.opengl.GLUtils;
import android.util.Log;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;

public class Main{
    private static final String TAG = "GLESUtil";
    public static final boolean DEBUG_GL_MEMOBJS = false;
    public static final String DEBUG_GL_MEMOBJS_NEW_TAG = "MEMOBJS_NEW";
    /**
     * Method that load a fragment shader and returns its handler identifier.
     *
     * @param src The source shader
     * @return int The handler identifier of the shader
     */
    public static int loadFragmentShader(String src) {
        return loadShader(src, GLES20.GL_FRAGMENT_SHADER);
    }
    /**
     * Method that load a shader and returns its handler identifier.
     *
     * @param src The source shader
     * @param type The type of shader
     * @return int The handler identifier of the shader
     */
    public static int loadShader(String src, int type) {
        int[] compiled = new int[1];
        // Create, load and compile the shader
        int shader = GLES20.glCreateShader(type);
        if (GLESUtil.DEBUG_GL_MEMOBJS) {
            Log.d(GLESUtil.DEBUG_GL_MEMOBJS_NEW_TAG, "glCreateShader ("
                    + type + "): " + shader);
        }
        GLESUtil.glesCheckError("glCreateShader");
        if (shader <= 0) {
            Log.e(TAG, "Cannot create a shader");
            return 0;
        }
        GLES20.glShaderSource(shader, src);
        GLESUtil.glesCheckError("glShaderSource");
        GLES20.glCompileShader(shader);
        GLESUtil.glesCheckError("glesCheckError");
        GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
        GLESUtil.glesCheckError("glesCheckError");
        if (compiled[0] <= 0) {
            String msg = "Shader compilation error trace:\n"
                    + GLES20.glGetShaderInfoLog(shader);
            Log.e(TAG, msg);
            return 0;
        }
        return shader;
    }
    /**
     * Method that checks if an GLES error is present
     *
     * @param func The GLES function to check
     * @return boolean If there was an error
     */
    public static boolean glesCheckError(String func) {
        int error = GLES20.glGetError();
        if (error != 0) {
            Log.e(TAG, "GLES20 Error (" + glesGetErrorModule() + ") ("
                    + func + "): " + GLUtils.getEGLErrorString(error));
            return true;
        }
        return false;
    }
    /**
     * Method that returns the line and module that generates the current error
     *
     * @return String The line and module
     */
    private static String glesGetErrorModule() {
        try {
            return String
                    .valueOf(Thread.currentThread().getStackTrace()[4]);
        } catch (IndexOutOfBoundsException ioobEx) {
            // Ignore
        }
        return "";
    }
}

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