diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_nir.cpp | 16 |
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; |