llvmpipe: implement scissor testing

The scissor test is implemented as another per-quad operation in
the JIT code.  The four scissor box params are passed via the
lp_jit_context.  In the JIT code we compare the quad's x/y coords
against the clip bounds and create a new in/out mask that's AND'd
with the main quad mask.

Note: we should also do scissor testing in the triangle setup code
to improve efficiency.  That's not done yet.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_setup.h b/src/gallium/drivers/llvmpipe/lp_setup.h
index 429abeba43b..c7ef3d394a4 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup.h
+++ b/src/gallium/drivers/llvmpipe/lp_setup.h
@@ -114,6 +114,10 @@ lp_setup_set_blend_color( struct setup_context *setup,
                           const struct pipe_blend_color *blend_color );
 
 void
+lp_setup_set_scissor( struct setup_context *setup,
+                      const struct pipe_scissor_state *scissor );
+
+void
 lp_setup_set_sampler_textures( struct setup_context *setup,
                                unsigned num, struct pipe_texture **texture);