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Author Topic: [fixed]  (Read 143 times)

ScriptedAwesome

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[fixed]
« on: August 23, 2017, 18:05:19 »

I'm getting this error:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 480000
   at Texture.<init>(Texture.java:32)
   at window.<init>(window.java:23)
   at window.main(window.java:58)
with this code:
Code: [Select]
import javax.imageio.ImageIO;
import static org.lwjgl.opengl.GL11.*;
import org.lwjgl.BufferUtils;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

public class Texture {

private int id;
private int width;
private int height;

public Texture(String filename) {
BufferedImage bi;
try {

bi = ImageIO.read(new File(filename));
width = bi.getWidth();
height = bi.getHeight();

int[] pixels_raw = new int[width * height];
pixels_raw = bi.getRGB(0, 0, width, height, null, 0, width);

ByteBuffer pixels = BufferUtils.createByteBuffer(width * height * 4);
for(int j = 0; j < height; j++) {
for(int i = 0; i < width; i++) {
int pixel = pixels_raw[i * width + j];
pixels.put((byte) ((pixel >> 16) & 0xFF));//RED
pixels.put((byte) ((pixel >> 8) & 0xFF));//GREEN
pixels.put((byte) ((pixel >> 0) & 0xFF));//BLUE
pixels.put((byte) ((pixel >> 24) & 0xFF));//ALPHA
}


}

pixels.flip();
id = glGenTextures();
glBindTexture(GL_TEXTURE_2D, id);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);


}catch(IOException e) {

e.printStackTrace();

}
}
public void bind() {
glBindTexture(GL_TEXTURE_2D, id);
}
}
and also
Code: [Select]
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import org.lwjgl.opengl.GL;
public class window { {

if(!glfwInit()) {

System.err.println("GLFW Failed to initialize");
System.exit(1);
}
long win = glfwCreateWindow(640, 480, "Quad!", 0, 0);



glfwShowWindow(win);

glfwMakeContextCurrent(win);

GL.createCapabilities();

glEnable(GL_TEXTURE_2D);

Texture tex = new Texture("./res/java1.png");

while(!glfwWindowShouldClose(win)) {
if(glfwGetKey(win, GLFW_KEY_A) == GL_TRUE) {
glfwSetWindowShouldClose(win, true);
}
glfwPollEvents();

tex.bind();

glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2f(-0.5f, 0.5f);

glTexCoord2f(0, 1);
glVertex2f(0.5f, 0.5f);

glTexCoord2f(1, 1);
glVertex2f(0.5f, -0.5f);

glTexCoord2f(1, 0);
glVertex2f(-0.5f, -0.5f);

glEnd();

glfwSwapBuffers(win);

}



glfwTerminate();
}

public static void main(String[] args) {
new window();
}

}

I am using Eclipse Neon, with a Windows 10, Java 8
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darkyellow

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Re: [fixed]
« Reply #1 on: August 24, 2017, 13:27:18 »

Try changing this

pixels_raw = bi.getRGB(0, 0, width, height, null, 0, width);

To

bi.getRGB(0, 0, width, height, pixels_raw, 0, width);
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Kai

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Re: [fixed]
« Reply #2 on: August 24, 2017, 14:01:59 »

The thread has already been renamed to "[fixed]" and the error was apparently in line 32 (at Texture.<init>(Texture.java:32)) which indeed was line 32 in the source listing:
Code: [Select]
int pixel = pixels_raw[i * width + j];
where 'i' runs over the width. Therefore, he was multiplying the 'i' (i.e. 'x' run variable) with the 'width'/stride which did not make much sense.
It should have been:
Code: [Select]
int pixel = pixels_raw[j * width + i];
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