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glsl: emit row_major matrix's SSBO stores only for components in writemask

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When writing to a column of a row-major matrix, each component of the
vector is stored to non-consecutive memory addresses, so we generate
one instruction per component.

This patch skips the disabled components in the writemask, saving some
store instructions plus avoid storing wrong data on each disabled
component.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
This commit is contained in:
Samuel Iglesias Gonsalvez 2015-09-30 15:03:15 +02:00
parent a552b77dcc
commit f42466322a
1 changed files with 6 additions and 0 deletions
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6
src/glsl/lower_ubo_reference.cpp
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@ -754,6 +754,12 @@ lower_ubo_reference_visitor::emit_access(bool is_write,
add(base_offset,
new(mem_ctx) ir_constant(deref_offset + i * matrix_stride));
if (is_write) {
/* If the component is not in the writemask, then don't
* store any value.
*/
if (!((1 << i) & write_mask))
continue;
base_ir->insert_after(ssbo_store(swizzle(deref, i, 1), chan_offset, 1));
} else {
if (!this->is_shader_storage) {