[Bf-viewport] OpenGL refactoring tasks

[Mike Erwin]

Thanks Brecht!

Please someone familiar with smoke shaders jump on that task. It's the only
thing in Blender that uses the old ARB programming API (pre GLSL).

For the GL_FLAT task do you mean the screen space derivatives in fragment
stage? I think it's better handled earlier in the pipeline, by using flat
interpolation and per-primitive normals. There needs to be some agreement
between a flat shader and the mesh data feeding it to get the right results.

Yes for immediate mode and matrix stacks; I'll report progress here.

Mike Erwin
musician, naturalist, pixel pusher, hacker extraordinaire

On Fri, Dec 11, 2015 at 3:37 PM, Brecht Van Lommel <
brechtvanlommel at pandora.be> wrote:

> Hi all,
>
> For developers who want to get involved in OpenGL refactoring, there
> are a couple of pretty well defined tasks to be done, listed here:
> http://wiki.blender.org/index.php/Dev:2.8/Source/OpenGL/Shaders#Tasks
>
> * Add stipple support to basic GLSL shader
> * Port smoke shader to GLSL
> * Implement texture paint multitexture masking shader in GLSL
> * Optimize basic GLSL shader
> * Add test .blend covering most GLSL material features
> * Add LOD bias in GLSL basic shader for icon drawing
> * Add glShadeModel(GL_FLAT) support in GLSL shaders (using dFdx / dFdy?)
>
> I can help you get started and review patches if you want to work on
> one of them.
>
> The implementation of the shader API design proposal I'll try do
> myself in the next couple of weeks, though I'm happy to leave it to
> someone else if there are volunteers. Once that's done there will be
> another set of tasks to replace fixed function shaders throughout the
> Blender code.
>
> Mike, as I understand it you will work something out for the immediate
> mode replacement and the matrix stack designs, and we'll wait a bit
> for that to be ready for others to get involved in?
>
> Thanks,
> Brecht.
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