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glsl: Generated masked write instead of vector array index for UBO lowering 

When reading a column from a row-major matrix, we would slot the single
value read into the vector using an ir_dereference_array of the vector
with a constant index.  This will (eventually) get optimized to a
masked-write, so just generate the masked write in the first place.

v2: Remove unused variable 'chan'.  Suggested by Ken.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Eric Anholt <eric@anholt.net>
This commit is contained in:
Ian Romanick 2013-03-22 18:55:49 -07:00
parent 65cc68f430
commit e0131196ca
1 changed files with 3 additions and 7 deletions
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10
src/glsl/lower_ubo_reference.cpp
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@ -356,18 +356,14 @@ lower_ubo_reference_visitor::emit_ubo_loads(ir_dereference *deref,
unsigned matrix_stride = 16;
for (unsigned i = 0; i < deref->type->vector_elements; i++) {
ir_rvalue *chan = new(mem_ctx) ir_constant((int)i);
ir_dereference *deref_chan =
new(mem_ctx) ir_dereference_array(deref->clone(mem_ctx, NULL),
chan);
ir_rvalue *chan_offset =
add(base_offset,
new(mem_ctx) ir_constant(deref_offset + i * matrix_stride));
base_ir->insert_before(assign(deref_chan,
base_ir->insert_before(assign(deref->clone(mem_ctx, NULL),
ubo_load(glsl_type::float_type,
chan_offset)));
chan_offset),
(1U << i)));
}
}
}