If GL_POINT_SPRITE mode is enabled and a texture has
GL_COORD_REPLACE enabled, the texture will apply coord_replace
to all primitive types, instead of only GL_POINTS as expected.
This change checks the prim_mode for every draw call and selects
the appropriate shader variant to enable coord_replace only when
rendering GL_POINTS primitives.
Closes: https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/188
Signed-off-by: Ryan Neph <ryanneph@google.com>
Reviewed-by: Eric Anholt <eric@anholt.net>