From f42466322a3c6f9dacf17caaf2b8f411e41ba7aa Mon Sep 17 00:00:00 2001 From: Samuel Iglesias Gonsalvez Date: Wed, 30 Sep 2015 15:03:15 +0200 Subject: [PATCH] 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 Reviewed-by: Iago Toral Quiroga --- src/glsl/lower_ubo_reference.cpp | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/glsl/lower_ubo_reference.cpp b/src/glsl/lower_ubo_reference.cpp index e581306019b..247620e6148 100644 --- a/src/glsl/lower_ubo_reference.cpp +++ b/src/glsl/lower_ubo_reference.cpp @@ -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) {