Using Vertex Buffers

Graphics and GPU Programming Programming

Started by Matthewj234 May 27, 2012 11:30 PM

1 comment, last by Matthewj234 11 years, 10 months ago

1,069

Author

May 27, 2012 11:30 PM

Hey guys, So Ive been pondering this for a while, and its annoying me. I am using LWJGL and I am trying to render a simple cube, buy using an array of verticies. Can anyone offer some help as to how to do this. I think im close, but its just wont seem to work

Anyway, the code is below, thanks in advance for any help offered!



public Voxel(float x, float y, float z) {

  // Set the location

  this.xOffs = x;

  this.yOffs = y;

  this.zOffs = z;

  // _initVertex();

  // Set the coordinates

  Float[] v = {

    // abccda

    // Top

    xp, yp, zm, xm, yp, zm, xm, yp, zp, xm, yp, zp, xp, yp, zp, xp, yp, zm,

    // Bottom

    // hgffeh

    xp, ym, zp, xm, ym, zp, xm, ym, zm, xm, ym, zm, xp, ym, zm, xp, ym, zp,

    // Front

    // dcgghd

    xp, yp, zp, xm, yp, zp, xm, ym, zp, xm, ym, zp, xp, ym, zp, xp, yp, zp,

    // Back

    // baeefb

    xm, yp, zm, xp, yp, zm, zp, ym, zp, xp, ym, zm, xm, ym, zm, xm, yp, zm,

    // Left

    // cbffgc

    xm, yp, zp, xm, yp, zm, xm, ym, zm, xm, ym, zm, xm, ym, zp, xm, yp, zp,

    // Right

    // adhhea

    xp, yp, zm, xp, yp, zp, xp, ym, zp, xp, ym, zp, xp, ym, zm, xp, yp, zm };

  vbo = BufferUtils.createFloatBuffer(v.length);

  for (int i = 0; i < v.length; i++) {

   vbo.put(v);

  }

  vertices = v;

  System.out.println("" + vbo);

}

public void render() {

  glEnableClientState(GL_VERTEX_ARRAY);

// glVertexPointer(3, GL_FLOAT, 0, vbo);

  // draw a cube

  glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, 0);

  // deactivate vertex arrays after drawing

  glDisableClientState(GL_VERTEX_ARRAY);

}

- Numprt

V-man

813

May 28, 2012 02:56 AM

Did you remember to bind your VBO and IBO (glBindBuffer)?

Normally, things look like this
http://www.opengl.org/wiki/VBO_-_just_examples

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

Matthewj234

1,069

Author

May 31, 2012 10:54 AM