LWJGL Forum

My Program shall render the results of an OpenCL-computation using a custom shader.
But when i call drawArrays using glVertexAttribPointer with type GL_INT, the javaw.exe crashes.

Here some code, which reproduces the crash:

import static org.lwjgl.opencl.CL10.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL15.*;
import static org.lwjgl.opengl.GL20.*;

import java.io.*;
import org.lwjgl.opencl.*;
import org.lwjgl.opengl.*;

public class Program {

private static CLContext clContext;
private static int glProgram;
private static int glProperties;
private static int aProperty;

public static void main(String[] args) {
try {
Display.create();

CL.create();
CLPlatform platform = CLPlatform.getPlatforms().get(0);
clContext = CLContext.createFromType(platform, CL_DEVICE_TYPE_GPU, null, Display.getDrawable(), null);
clReleaseContext(clContext);
CL.destroy();

loadShaderProgram("vshader.gl", "fshader.gl");
} catch (Exception e) {
e.printStackTrace();
}
glProperties = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, glProperties);
glBufferData(GL_ARRAY_BUFFER, 4, GL_DYNAMIC_COPY);

while(!Display.isCloseRequested()) {
glClear(GL_COLOR_BUFFER_BIT);
glBindBuffer(GL_ARRAY_BUFFER, glProperties);
glVertexAttribPointer(aProperty, 1, GL_INT, false, 0, 0);
glDrawArrays(GL_POINTS, 0, 1);
Display.update();
}
Display.destroy();

//FIXME EVIL CODE !!! (this belongs to the other bug i posted)
try {
Runtime.getRuntime().exec("TASKKILL /F /FI \"MODULES eq lwjgl64.dll\"");
} catch (Exception e) {
e.printStackTrace();
}
//FIXME EVIL CODE !!!
}

private static void loadShaderProgram(String vsfile, String fsfile)
throws FileNotFoundException, IOException {
int vshader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vshader, "attribute int aProperty;" +
   "varying int vProperty;" +
   "void main(){"  +
   " vProperty = aProperty;" +
   " gl_Position = vec4(0.5, 0.5, 0.5, 1);" +
   "}");
glCompileShader(vshader);

int fshader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fshader, "varying int vProperty;" +
   "void main(){" +
   " if(vProperty == 0) {" +
  " gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);" +
  " } else {" +
  " gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);" +
  " }" +
  "}");
glCompileShader(fshader);

glProgram = glCreateProgram();
glAttachShader(glProgram, vshader);
glAttachShader(glProgram, fshader);
glLinkProgram(glProgram);
glValidateProgram(glProgram);

aProperty = glGetAttribLocation(glProgram, "aProperty");
glEnableVertexAttribArray(aProperty);

glUseProgram(glProgram);
}
}


If i comment out the clContext creation, the program works as expected.
If i pass GL_FLOAT instead of GL_INT to glVertexAttribPointer in the render loop, the program works as expected too.
But i don't think that's the right way.

When Java crashes there is only the Windows notification that the program doesn't work anymore.

This bug maybe related to my other bug (http://lwjgl.org/forum/index.php/topic,4374.0.html (http://lwjgl.org/forum/index.php/topic,4374.0.html))
In both cases the clContext influences the OpenGL part of the program, although it should be released.

I am using:
windows 7 (64bit)
java 7 (64bit)
lwjgl 2.8.2

Intel Pentium Dual-Core CPU
ATI Mobility Radeon HD 4300 Series graphics card

I hope you can help me.

Hey Jens,

I've tried compiling and running both code samples you reported and I cannot reproduce any crash or error. I'm on Win7, Radeon 5870, Java 7u2, latest drivers, latest LWJGL nightly build, tried both x86 and x64 VMs.

Most likely it's a driver problem on your setup. Check your Catalyst CC, what driver version are you running?

OK, updated the driver and it works

Thanks for your help.