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-rw-r--r--src/mesa/drivers/dri/i965/brw_fs_nir.cpp16
1 files changed, 14 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 52d5ad1..73b09f5 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -2433,16 +2433,28 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
fs_reg source = fs_reg(0);
int mlen = 1 * reg_width;
+
+ /* A resinfo's sampler message is used to get the buffer size.
+ * The SIMD8's writeback message consists of four registers and
+ * SIMD16's writeback message consists of 8 destination registers
+ * (two per each component), although we are only interested on the
+ * first component, where resinfo returns the buffer size for
+ * SURFTYPE_BUFFER.
+ */
+ int regs_written = 4 * mlen;
fs_reg src_payload = fs_reg(GRF, alloc.allocate(mlen),
BRW_REGISTER_TYPE_UD);
bld.LOAD_PAYLOAD(src_payload, &source, 1, 0);
-
+ fs_reg buffer_size = fs_reg(GRF, alloc.allocate(regs_written),
+ BRW_REGISTER_TYPE_UD);
const unsigned index = prog_data->binding_table.ssbo_start + ssbo_index;
- fs_inst *inst = bld.emit(FS_OPCODE_GET_BUFFER_SIZE, dest,
+ fs_inst *inst = bld.emit(FS_OPCODE_GET_BUFFER_SIZE, buffer_size,
src_payload, fs_reg(index));
inst->header_size = 0;
inst->mlen = mlen;
+ inst->regs_written = regs_written;
bld.emit(inst);
+ bld.MOV(retype(dest, buffer_size.type), buffer_size);
brw_mark_surface_used(prog_data, index);
break;