OpenGL + LWJGL: glDrawArrays() draws nothing

Mindstormscreator · 2013-05-12 02:39:10

Hey there!
I'm trying to get some basic OpenGL code working through LWJGL. The following sample code is identical to that from the LWJGL wiki page except where marked in a comment as " //EDIT ". The edits were just to make it run on OpenGL 3.0, not just 3.2.

I ran this on both Windows 7 and Arch. On Windows, it produces a white square on a blue background exactly as intended. On Linux, it just produces the blue background with no white square.

Here's my test code:

import java.nio.FloatBuffer;

import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.ContextAttribs;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
import org.lwjgl.opengl.PixelFormat;
import org.lwjgl.util.glu.GLU;
public class Test {
// Entry point for the application
public static void main(String[] args) {
    new Test();
}

// Setup variables
private final String WINDOW_TITLE = "The Quad: glDrawArrays";
private final int WIDTH = 320;
private final int HEIGHT = 240;
// Quad variables
private int vaoId = 0;
private int vboId = 0;
private int vertexCount = 0;

public Test() {
    // Initialize OpenGL (Display)
    this.setupOpenGL();

    this.setupQuad();

    while (!Display.isCloseRequested()) {
        // Do a single loop (logic/render)
        this.loopCycle();

        // Force a maximum FPS of about 60
        Display.sync(60);
        // Let the CPU synchronize with the GPU if GPU is tagging behind
        Display.update();
    }

    // Destroy OpenGL (Display)
    this.destroyOpenGL();
}

public void setupOpenGL() {
    // Setup an OpenGL context with API version 3.2
    try {
        PixelFormat pixelFormat = new PixelFormat();
                                                 // EDIT: Used to be (3, 2)
        ContextAttribs contextAtrributes = new ContextAttribs(3, 0)
            .withForwardCompatible(true);
                        // EDIT: the next line was removed (and a ; placed on line above)
                        //.withProfileCore(true);

        Display.setDisplayMode(new DisplayMode(WIDTH, HEIGHT));
        Display.setTitle(WINDOW_TITLE);
        Display.create(pixelFormat, contextAtrributes);

        GL11.glViewport(0, 0, WIDTH, HEIGHT);
    } catch (LWJGLException e) {
        e.printStackTrace();
        System.exit(-1);
    }

    // Setup an XNA like background color
    GL11.glClearColor(0.4f, 0.6f, 0.9f, 0f);

    // Map the internal OpenGL coordinate system to the entire screen
    GL11.glViewport(0, 0, WIDTH, HEIGHT);

    this.exitOnGLError("Error in setupOpenGL");
}

public void setupQuad() {       
    // OpenGL expects vertices to be defined counter clockwise by default
    float[] vertices = {
            // Left bottom triangle
            -0.5f, 0.5f, 0f,
            -0.5f, -0.5f, 0f,
            0.5f, -0.5f, 0f,
            // Right top triangle
            0.5f, -0.5f, 0f,
            0.5f, 0.5f, 0f,
            -0.5f, 0.5f, 0f
    };
    // Sending data to OpenGL requires the usage of (flipped) byte buffers
    FloatBuffer verticesBuffer = BufferUtils.createFloatBuffer(vertices.length);
    verticesBuffer.put(vertices);
    verticesBuffer.flip();

    vertexCount = 6;

    // Create a new Vertex Array Object in memory and select it (bind)
    // A VAO can have up to 16 attributes (VBO's) assigned to it by default
    vaoId = GL30.glGenVertexArrays();
    GL30.glBindVertexArray(vaoId);

    // Create a new Vertex Buffer Object in memory and select it (bind)
    // A VBO is a collection of Vectors which in this case resemble the location of each vertex.
    vboId = GL15.glGenBuffers();
    GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboId);
    GL15.glBufferData(GL15.GL_ARRAY_BUFFER, verticesBuffer, GL15.GL_STATIC_DRAW);
    // Put the VBO in the attributes list at index 0
    GL20.glVertexAttribPointer(0, 3, GL11.GL_FLOAT, false, 0, 0);
    // Deselect (bind to 0) the VBO
    GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);

    // Deselect (bind to 0) the VAO
    GL30.glBindVertexArray(0);

    this.exitOnGLError("Error in setupQuad");
}

public void loopCycle() {
    GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);

    // Bind to the VAO that has all the information about the quad vertices
    GL30.glBindVertexArray(vaoId);
    GL20.glEnableVertexAttribArray(0);

    // Draw the vertices
    GL11.glDrawArrays(GL11.GL_TRIANGLES, 0, vertexCount);

    // Put everything back to default (deselect)
    GL20.glDisableVertexAttribArray(0);
    GL30.glBindVertexArray(0);

    this.exitOnGLError("Error in loopCycle");
}

public void destroyOpenGL() {       
    // Disable the VBO index from the VAO attributes list
    GL20.glDisableVertexAttribArray(0);

    // Delete the VBO
    GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
    GL15.glDeleteBuffers(vboId);

    // Delete the VAO
    GL30.glBindVertexArray(0);
    GL30.glDeleteVertexArrays(vaoId);

    Display.destroy();
}

public void exitOnGLError(String errorMessage) {
    int errorValue = GL11.glGetError();

    if (errorValue != GL11.GL_NO_ERROR) {
        String errorString = GLU.gluErrorString(errorValue);
        System.err.println("ERROR - " + errorMessage + ": " + errorString);

        if (Display.isCreated()) Display.destroy();
        System.exit(-1);
    }
}
}

Here's LWJGL's debug output on Windows:

[LWJGL] Initial mode: 1920 x 1080 x 32 @60Hz
[LWJGL] MemoryUtil Accessor: AccessorUnsafe
Could not locate symbol glTextureParameteriEXT
Could not locate symbol glTextureParameterivEXT
Could not locate symbol glTextureParameterfEXT
Could not locate symbol glTextureParameterfvEXT
Could not locate symbol glTextureImage1DEXT
Could not locate symbol glTextureImage2DEXT
Could not locate symbol glTextureSubImage1DEXT
Could not locate symbol glTextureSubImage2DEXT
Could not locate symbol glCopyTextureImage1DEXT
Could not locate symbol glCopyTextureImage2DEXT
Could not locate symbol glCopyTextureSubImage1DEXT
Could not locate symbol glCopyTextureSubImage2DEXT
Could not locate symbol glGetTextureImageEXT
Could not locate symbol glGetTextureParameterfvEXT
Could not locate symbol glGetTextureParameterivEXT
Could not locate symbol glGetTextureLevelParameterfvEXT
Could not locate symbol glGetTextureLevelParameterivEXT
Could not locate symbol glTextureImage3DEXT
Could not locate symbol glTextureSubImage3DEXT
Could not locate symbol glCopyTextureSubImage3DEXT
Could not locate symbol glBindMultiTextureEXT
Could not locate symbol glMultiTexParameteriEXT
Could not locate symbol glMultiTexParameterivEXT
Could not locate symbol glMultiTexParameterfEXT
Could not locate symbol glMultiTexParameterfvEXT
Could not locate symbol glMultiTexImage1DEXT
Could not locate symbol glMultiTexImage2DEXT
Could not locate symbol glMultiTexSubImage1DEXT
Could not locate symbol glMultiTexSubImage2DEXT
Could not locate symbol glCopyMultiTexImage1DEXT
Could not locate symbol glCopyMultiTexImage2DEXT
Could not locate symbol glCopyMultiTexSubImage1DEXT
Could not locate symbol glCopyMultiTexSubImage2DEXT
Could not locate symbol glGetMultiTexImageEXT
Could not locate symbol glGetMultiTexParameterfvEXT
Could not locate symbol glGetMultiTexParameterivEXT
Could not locate symbol glGetMultiTexLevelParameterfvEXT
Could not locate symbol glGetMultiTexLevelParameterivEXT
Could not locate symbol glMultiTexImage3DEXT
Could not locate symbol glMultiTexSubImage3DEXT
Could not locate symbol glCopyMultiTexSubImage3DEXT
Could not locate symbol glEnableClientStateiEXT
Could not locate symbol glDisableClientStateiEXT
Could not locate symbol glGetFloatIndexedvEXT
Could not locate symbol glGetDoubleIndexedvEXT
Could not locate symbol glGetPointerIndexedvEXT
Could not locate symbol glGetFloati_vEXT
Could not locate symbol glGetDoublei_vEXT
Could not locate symbol glGetPointeri_vEXT
Could not locate symbol glNamedProgramStringEXT
Could not locate symbol glNamedProgramLocalParameter4dEXT
Could not locate symbol glNamedProgramLocalParameter4dvEXT
Could not locate symbol glNamedProgramLocalParameter4fEXT
Could not locate symbol glNamedProgramLocalParameter4fvEXT
Could not locate symbol glGetNamedProgramLocalParameterdvEXT
Could not locate symbol glGetNamedProgramLocalParameterfvEXT
Could not locate symbol glGetNamedProgramivEXT
Could not locate symbol glGetNamedProgramStringEXT
Could not locate symbol glCompressedTextureImage3DEXT
Could not locate symbol glCompressedTextureImage2DEXT
Could not locate symbol glCompressedTextureImage1DEXT
Could not locate symbol glCompressedTextureSubImage3DEXT
Could not locate symbol glCompressedTextureSubImage2DEXT
Could not locate symbol glCompressedTextureSubImage1DEXT
Could not locate symbol glGetCompressedTextureImageEXT
Could not locate symbol glCompressedMultiTexImage3DEXT
Could not locate symbol glCompressedMultiTexImage2DEXT
Could not locate symbol glCompressedMultiTexImage1DEXT
Could not locate symbol glCompressedMultiTexSubImage3DEXT
Could not locate symbol glCompressedMultiTexSubImage2DEXT
Could not locate symbol glCompressedMultiTexSubImage1DEXT
Could not locate symbol glGetCompressedMultiTexImageEXT
Could not locate symbol glNamedBufferDataEXT
Could not locate symbol glNamedBufferSubDataEXT
Could not locate symbol glMapNamedBufferEXT
Could not locate symbol glUnmapNamedBufferEXT
Could not locate symbol glGetNamedBufferParameterivEXT
Could not locate symbol glGetNamedBufferPointervEXT
Could not locate symbol glGetNamedBufferSubDataEXT
Could not locate symbol glProgramUniform1fEXT
Could not locate symbol glProgramUniform2fEXT
Could [LWJGL] GL_EXT_direct_state_access was reported as available but an entry point is missing

and for Linux:

Could not locate symbol glXSwapIntervalEXT
Could not locate symbol glXEnumerateVideoDevicesNV
Could not locate symbol glXBindVideoCaptureDeviceNV
[LWJGL] Xrandr extension version 1.3
[LWJGL] Using Xrandr for display mode switching
[LWJGL] XF86VidMode extension version 2.2
[LWJGL] Initial mode: 1366 x 768 x 24 @60Hz
[LWJGL] Pixel format info: r = 8, g = 8, b = 8, a = 0, depth = 24, stencil = 8, sample buffers = 0, samples = 0
[LWJGL] MemoryUtil Accessor: AccessorUnsafe

Any help would be fantastic.

Last edited by Mindstormscreator (2013-05-12 02:42:40)

Arch Linux

#1 2013-05-12 02:39:10

OpenGL + LWJGL: glDrawArrays() draws nothing

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