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Editorial Team
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Asked: 2026-06-12T17:32:02+00:00

I’m rendering an interleaved vbo using the following code which works fine. glVertexPointer(3, GL_FLOAT,

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I’m rendering an interleaved vbo using the following code which works fine.

    glVertexPointer(3, GL_FLOAT, sizeof(InterleavedVertexData), (GLvoid*)((char*)0));
    glNormalPointer(GL_FLOAT, sizeof(InterleavedVertexData), (GLvoid*)((char*)0+3*sizeof(GLfloat)));
    glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(InterleavedVertexData), (GLvoid*)((char*)0+6*sizeof(GL_UNSIGNED_BYTE)));

When I change glColorPointer’s pointer paramater to use GLubyte i don’t see anything rendered on the screen? I’m defining colour as GLubyte in my struct also.

    glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(InterleavedVertexData), (GLvoid*)((char*)0+6*sizeof(GLubyte)));
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1 Answer

  1. Editorial Team

    GLubyte is a type. GL_UNSIGNED_BYTE is an integer constant which is often used to indicate that you will pass a GLubyte in a pointer.

    sizeof(GLubyte) is always 1 by definition. Taking sizeof(GL_UNSIGNED_BYTE) will typically return 4 or 8, because it’s an integer constant, and has the size of whatever your system’s integer size is.

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