glsl: emit row_major matrix's SSBO stores only for components in writemask
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>
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@ -754,6 +754,12 @@ lower_ubo_reference_visitor::emit_access(bool is_write,
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add(base_offset,
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new(mem_ctx) ir_constant(deref_offset + i * matrix_stride));
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if (is_write) {
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/* If the component is not in the writemask, then don't
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* store any value.
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*/
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if (!((1 << i) & write_mask))
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continue;
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base_ir->insert_after(ssbo_store(swizzle(deref, i, 1), chan_offset, 1));
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} else {
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if (!this->is_shader_storage) {
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