[Bf-committers] Matcaps and PBVH

[Brecht Van Lommel]

The fact that it doesn't work with flat shading is not a bug, the
vertex normals add another attribute and you're probably not getting
the right attribute id anymore in that case.

The way this should be implemented is not through gl_Color, but the
same as as other data layers passed to GLSL shaders. They call
GPU_attribute(..) to pass same data layer as an attribute to the GLSL
shader. This will then cause GPUVertexAttribs to contain the data
layer, which is used by DM_vertex_attributes_from_gpu to find the
corresponding data layers in the mesh for drawing.

The mask is stored as a data layer CD_PAINT_MASK, so as far as I can
tell it should be possible to get this working.

On Fri, May 24, 2013 at 4:09 AM, Erik Sejersen <ehsejersen at gmail.com> wrote:
> Hi,
>
> I've found a way to get the mask information into the shader without using
> any gl calls. By adding gl_FrontColor = gl_Color to the vertex shader I can
> use gl_Color in the fragment shader.
> The only problem I have atm is that when I use flat shading mode the value
> og gl_Color in the fragment shader suddenly holds the value of "varnormal".
> I guess it's a driver bug of sorts as it doesn't happen in smooth shading.
>
> Also the code I've added enables regular GLSL also as a side bonus.
>
> -Erik
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