glsl: Add lowering pass for ir_triop_vector_insert

This will eventually replace do_vec_index_to_cond_assign.  This lowering
pass is called in all the places where do_vec_index_to_cond_assign or
do_vec_index_to_swizzle is called.

v2: Use WRITEMASK_* instead of integer literals.  Use a more concise
method of generating broadcast_index.  Both suggested by Eric.

v3: Use a series of scalar compares instead of a single vector compare.
Suggested by Eric and Ken.  It still uses 'if (cond) v.x = y;' instead
of conditional assignments because ir_builder doesn't do conditional
assignments, and I'd rather keep the code simple.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index 8dcab75a433..03e43297023 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -174,6 +174,7 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
       do_lower_texture_projection(shader->ir);
       brw_lower_texture_gradients(intel, shader->ir);
       do_vec_index_to_cond_assign(shader->ir);
+      lower_vector_insert(shader->ir, true);
       brw_do_cubemap_normalize(shader->ir);
       lower_noise(shader->ir);
       lower_quadop_vector(shader->ir, false);