Geometry Shaders in the BGE (Windows build available)

Game Engine Game Engine Support and Discussion
1

Hello all!

I’ve submitted a patch that adds geometry shader support to the BGE. Here is the description from the patch:

Here is a patch to add geometry shaders to the BGE. Here is a wikipedia link on geometry shaders:
http://en.wikipedia.org/wiki/Geometry_shader

This patch requires GLEW to be updated like in this patch:
https://projects.blender.org/tracker/index.php?func=detail&aid=19796&group_id=9&atid=127

I’ll be making a build for Graphicall for people to test to make sure the geometry shaders are working correctly. My
quick tests (a pass-through and swizzling the x and y of the inputs) worked, but I’m not that great with GLSL.

Also, there are some api changes for this new feature:
BL_Shader.setGeometryInputType(type)
BL_Shader.setGeometryOutputType(type)

These change the input and output types of the geometry shader and I think they should be placed before the call to
BL_Shader.setSources(). Also, I’ve added some constants to GameLogic for these.

Also, I’ve added an optional parameter on the end of BL_Shader.setSources() for the geometry shader. This, however makes
it look kind of odd:

BL_Shader.setSources(vertProg, fragProg, apply, geomProg=None)

And here is a link to a Windows build:
http://graphicall.org/builds/builds/showbuild.php?action=show&id=1166

And here is a Blend file with a very simple geometry shader:

Attachments

geom.blend (76.5 KB)

2

VEEEERY COOLL!!!
very simple to use in python code, like a fragment shader… very nice!
I don´t now if this will be fast ( e.g. in a tesselation grid for water simulation… ) , but is a cool feature xD
Congrats and Thanks!