CODEWITHSUNDEEP
openglrust
Raguel
Raguel

Reputation: 625

How to set offset for VertexAttribPointer with rust?

I was playing around with gl-rs and in the original opengl tutorial they set VertexAttribPointer and it's offset with:

glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)(3* sizeof(float)));

With the gl-rs I can't understand how to set offset of (void*)(3* sizeof(float). I can set (void*)0 with :

gl::VertexAttribPointer(
            0,         
            3,        
            gl::FLOAT, 
            gl::FALSE, 
            (6 * std::mem::size_of::<f32>()) as gl::types::GLint, 
            std::ptr::null(),                                     // offset 
        );

How do I set different values like (void*)(3* sizeof(float) for the offset? I am not familiar with C so explanation would be appreciated.

Upvotes: 3

Views: 434

Answers (1)

Rabbid76
Rabbid76

Reputation: 210908

The last parameter (offset) has to be cast to *const gl::types::GLvoid:

gl::VertexAttribPointer(
            1,
            3,
            gl::FLOAT,
            gl::FALSE,
            (6 * std::mem::size_of::<f32>()) as gl::types::GLint,
            (3 * std::mem::size_of::<f32>()) as *const gl::types::GLvoid
        );

See also
glVertexAttribPointer
Rust and OpenGL from scratch - Vertex Attribute Format

Upvotes: 3

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