• Advertisement
Sign in to follow this  

VBO segfaulting [solved]

This topic is 3085 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

I'm trying to use a VBO, but it keeps on segfaulting on me. Here is how I set up the VBO
    glGenBuffers(1, &m_testVBO);
    glBindBuffer(GL_ARRAY_BUFFER, m_testVBO);

    GLfloat vertexData[] = {0.0f, 1.0f,
                          0.0f, 0.0f,
                          1.0f, 1.0f,
                          1.0f, 0.0f};

    GLfloat colorData[] = {.3f, .3f, .3f, 1.f,
                           .5f, .5f, .5f, 1.f,
                           1.f, .5f, .5f, 1.f,
                           1.f, 1.f, 1.f, 1.f};

    glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData) + sizeof(colorData), 0, GL_STATIC_DRAW);
    glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertexData), vertexData);
    glBufferSubData(GL_ARRAY_BUFFER, sizeof(vertexData), sizeof(colorData), colorData);

    glColorPointer(4, GL_FLOAT, 0, (void*)(sizeof(vertexData)));
    glVertexPointer(2, GL_FLOAT, 0, (void*)(0));

    glBindBuffer(GL_ARRAY_BUFFER, 0);


and here is how I render it.
glBindBuffer(GL_ARRAY_BUFFER, m_testVBO);
  glEnableClientState(GL_VERTEX_ARRAY);
  glEnableClientState(GL_COLOR_ARRAY);

  glColorPointer(4, GL_FLOAT, 0, (GLvoid*)(8 * sizeof(GLfloat)));
  glVertexPointer(2, GL_FLOAT, 0, 0);
  
  glDrawArrays(GL_QUADS, 0, 4);

  glDisableClientState(GL_COLOR_ARRAY);
  glDisableClientState(GL_VERTEX_ARRAY);

  glBindBuffer(GL_ARRAY_BUFFER, 0);


At this point, I have no idea what I'm doing wrong. (I'm just trying to render a rectangle.) [Edited by - J2902 on September 12, 2009 6:18:10 PM]

Share this post


Link to post
Share on other sites
Advertisement
The code looks correct to me, so just make sure there are no GL errors, you have existing context while creating the VBO and m_testVBO is not zero.

Share this post


Link to post
Share on other sites
/sigh I thought I had a valid context, but upon closer examination I didn't. :(

Thanks.

Share this post


Link to post
Share on other sites
Sign in to follow this  

  • Advertisement