Skip to content

Instantly share code, notes, and snippets.

@ka-ka-xyz ka-ka-xyz/Main.java
Last active Jan 28, 2018

Embed
What would you like to do?
aparapi sample
package example;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.aparapi.Kernel;
import com.aparapi.Range;
/**
* Required System Properties
*
*-Dexample.useGPU: true of false.
*-Dexample.inputFilePath: input file path str.
*-Dexample.outputFilePath: output file path str.
*-Djava.library.path: path to directory of aparapi_x86_64.dll
*-Dcom.aparapi.enableShowGeneratedOpenCL: when you want detailed info, true.
*-Dcom.aparapi.enableExecutionModeReporting: when you want detailed info, true.
* */
public class Main {
private int width;
private int height;
public static void main(String[] args) throws IOException {
boolean useGPU = Boolean.getBoolean("example.useGPU");
String inputFilePath = System.getProperty("example.inputFilePath");
String outputFilePath = System.getProperty("example.outputFilePath");
Main main = new Main();
int[] pixels = main.loadFile(new File(inputFilePath));
long start = System.currentTimeMillis();
if (useGPU) {
main.convertToGrayScaleInGpu(pixels);
} else {
main.convertToGrayScaleInJvm(pixels);
}
System.out.println("Convert Finished:" + (System.currentTimeMillis() - start) + "ms");
File outFile = new File(outputFilePath);
main.saveFile(outFile, pixels);
}
private void convertToGrayScaleInJvm(final int[] pixels) {
for (int i = 0; i < pixels.length; i++) {
int pixel = pixels[i];
int alpha = pixel >> 24 & 0xFF;
int red = pixel >> 16 & 0xFF;
int green = pixel >> 8 & 0xFF;
int blue = pixel & 0xFF;
int y = (int)(0.298912 * red + 0.586611 * green + 0.114478 * blue);
pixels[i] = alpha << 24 | y << 16 | y << 8 | y;
}
}
private void convertToGrayScaleInGpu(final int[] pixels) {
Kernel kernel = new Kernel() {
@Override
public void run() {
//GPU world
int i = getGlobalId();
int pixel = pixels[i];
int alpha = pixel >> 24 & 0xFF;
int red = pixel >> 16 & 0xFF;
int green = pixel >> 8 & 0xFF;
int blue = pixel & 0xFF;
int y = (int)(0.298912 * red + 0.586611 * green + 0.114478 * blue);
pixels[i] = alpha << 24 | y << 16 | y << 8 | y;
}};
int size = pixels.length;
kernel.execute(Range.create(size));
}
private int[] loadFile(File file) throws IOException {
BufferedImage img = ImageIO.read(file);
this.width = img.getWidth();
this.height = img.getHeight();
int[] pixels = new int[width*height];
img.getRGB(0, 0, width, height, pixels, 0, width);
return pixels;
}
private void saveFile(File file, int[] px) throws IOException {
BufferedImage out = new BufferedImage(this.width, this.height, BufferedImage.TYPE_INT_RGB);
out.setRGB(0, 0, this.width, this.height, px, 0, this.width);
ImageIO.write(out, "jpg", file);
}
}
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>ka_ka_xyz</groupId>
<artifactId>example.gpu</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>gpu_example</name>
<dependencies>
<dependency>
<groupId>com.aparapi</groupId>
<artifactId>aparapi</artifactId>
<version>1.4.1</version>
</dependency>
</dependencies>
</project>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.