[Bug 105301] The big SKQP bug

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105301

--- Comment #36 from Dongseong Hwang <dongseong.hwang at intel.com> ---
Thank you for all quick response and fixing this issue.

Kenneth, I carefully checked skqp. skia never do something wrong.

When it uses double blend src, skia explicitly uses the program and sets the
blend func.
glUseProgram(program = 7)
glBlendFunc(sfactor = GL_ONE, dfactor = GL_ONE_MINUS_SRC1_COLOR)

Whenever it uses single blend src, skia explicitly uses the program and sets
the blend func again.
glUseProgram(program = 16)
glBlendFunc(sfactor = GL_ONE, dfactor = GL_ONE_MINUS_SRC_ALPHA)

I think it's the hidden bug of mesa and the following patch accidentally fix
it.
https://patchwork.freedesktop.org/patch/235939/

I guess |wm_prog_data->dual_src_blend| is stale at the point, although skia
calls glBlendFunc(sfactor = GL_ONE, dfactor = GL_ONE_MINUS_SRC_ALPHA).

What do you think?

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