fbo-gl_pointcoord failing with swrast

Submitted by zhao jian

Assigned to Ian Romanick

Link to original bug (#46204)

Description

System Environment:

Mesa: (master)26de5273

Bug detailed description:

When run some shaders involving pointcoord and point size, it fails with software rendering on all platforms(Pinetrail, Piketon, HuronRiver).

Reproduce steps:

1. xinit
2. LIBGL_ALWAYS_SOFTWARE=1 ./fbo-gl_pointcoord

Version: git