Problems with output of vertex buffers

[go-gl-legacy]

Problems with output of vertex buffers

[pwaller]

Unfortunately my old netbook does worse, the above gist causes:

panic: runtime error: call of nil func value
[signal 0xb code=0x1 addr=0x0 pc=0x0]

goroutine 1 [syscall]:
github.com/go-gl/gl._Cfunc_glGenBuffers(0x1, 0x187001a0)
    /tmp/go-build242548822/github.com/go-gl/gl/_obj/_cgo_defun.c:1138 +0x32
github.com/go-gl/gl.GenBuffer(0x0, 0x0)
    /tmp/go-build242548822/github.com/go-gl/gl/_obj/gl.cgo1.go:829 +0x41

It has GL_ARB_vertex_buffer_object, but I guess glew doesn't do translation to "ARB-style" calls? I think is why I ended up abandoning vertex buffers for the time being.

[pwaller]

(Oh, and gl.UnbindBuffer is undefined - if you implemented it locally mind sending a PR?)

gl.UnbindBuffer should be gl.BufferUnbind. it seems I've changed that at some point while messing around with the gl API. The gist is fixed accordingly.

[banthar]

verts   = [...][]float32{{0, 0}, {100, 0}, {100, 100}, {0, 100}}

Is an array of slices. It should be:

verts   = [...][2]float32{{0, 0}, {100, 0}, {100, 100}, {0, 100}}

If I change that it still doesn't work. There are other problems.

[banthar]

OK. I fixed it: https://gist.github.com/3947436

Size in BufferData was wrong and VertexPointer and DrawElements should have offset instead of absolute pointer.

There is nothing wrong with gl, except it accepts silly arguments.

Nice, thanks.