Android Open Source - muzei G L Util

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright 2014 Google Inc.// ww w  . ja  v  a  2 s  .  c  om
 *
 * 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 com.google.android.apps.muzei.render;

import android.graphics.Bitmap;
import android.opengl.GLES20;
import android.opengl.GLUtils;

import com.google.android.apps.muzei.util.LogUtil;

import net.nurik.roman.muzei.BuildConfig;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import static com.google.android.apps.muzei.util.LogUtil.LOGE;

public class GLUtil {
    private static final String TAG = LogUtil.makeLogTag(GLUtil.class);

    public static final int BYTES_PER_FLOAT = 4;

    public static int loadShader(int type, String shaderCode) {
        // create a vertex shader type (GLES20.GL_VERTEX_SHADER)
        // or a fragment shader type (GLES20.GL_FRAGMENT_SHADER)
        int shaderHandle = GLES20.glCreateShader(type);

        // add the source code to the shader and compile it
        GLES20.glShaderSource(shaderHandle, shaderCode);
        GLES20.glCompileShader(shaderHandle);
        checkGlError("glCompileShader");
        return shaderHandle;
    }

    public static int createAndLinkProgram(int vertexShaderHandle, int fragShaderHandle,
            String[] attributes) {
        int programHandle = GLES20.glCreateProgram();
        GLUtil.checkGlError("glCreateProgram");
        GLES20.glAttachShader(programHandle, vertexShaderHandle);
        GLES20.glAttachShader(programHandle, fragShaderHandle);
        if (attributes != null) {
            final int size = attributes.length;
            for (int i = 0; i < size; i++) {
                GLES20.glBindAttribLocation(programHandle, i, attributes[i]);
            }
        }
        GLES20.glLinkProgram(programHandle);
        GLUtil.checkGlError("glLinkProgram");
        GLES20.glDeleteShader(vertexShaderHandle);
        GLES20.glDeleteShader(fragShaderHandle);
        return programHandle;
    }

    public static int loadTexture(Bitmap bitmap) {
        final int[] textureHandle = new int[1];

        GLES20.glGenTextures(1, textureHandle, 0);
        GLUtil.checkGlError("glGenTextures");

        if (textureHandle[0] != 0) {
            // Bind to the texture in OpenGL
            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle[0]);

            // Set filtering
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
                    GLES20.GL_CLAMP_TO_EDGE);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
                    GLES20.GL_CLAMP_TO_EDGE);
            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);

            // Load the bitmap into the bound texture.
            GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
            GLUtil.checkGlError("texImage2D");
        }

        if (textureHandle[0] == 0) {
            LOGE(TAG, "Error loading texture (empty texture handle)");
            if (BuildConfig.DEBUG) {
                throw new RuntimeException("Error loading texture (empty texture handle).");
            }
        }

        return textureHandle[0];
    }

    public static void checkGlError(String glOperation) {
        int error;
        while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
            LOGE(TAG, glOperation + ": glError " + error);
            if (BuildConfig.DEBUG) {
                throw new RuntimeException(glOperation + ": glError " + error);
            }
        }
    }

    public static FloatBuffer asFloatBuffer(float[] array) {
        FloatBuffer buffer = newFloatBuffer(array.length);
        buffer.put(array);
        buffer.position(0);
        return buffer;
    }

    public static FloatBuffer newFloatBuffer(int size) {
        FloatBuffer buffer = ByteBuffer.allocateDirect(size * BYTES_PER_FLOAT)
                .order(ByteOrder.nativeOrder())
                .asFloatBuffer();
        buffer.position(0);
        return buffer;
    }
}
Java Source Code List
