| /* |
| * Copyright © 2013 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| * DEALINGS IN THE SOFTWARE. |
| */ |
| |
| /** |
| * \file brw_vec4_tcs.cpp |
| * |
| * Tessellaton control shader specific code derived from the vec4_visitor class. |
| */ |
| |
| #include "brw_nir.h" |
| #include "brw_vec4_tcs.h" |
| #include "brw_fs.h" |
| #include "dev/gen_debug.h" |
| |
| namespace brw { |
| |
| vec4_tcs_visitor::vec4_tcs_visitor(const struct brw_compiler *compiler, |
| void *log_data, |
| const struct brw_tcs_prog_key *key, |
| struct brw_tcs_prog_data *prog_data, |
| const nir_shader *nir, |
| void *mem_ctx, |
| int shader_time_index, |
| const struct brw_vue_map *input_vue_map) |
| : vec4_visitor(compiler, log_data, &key->base.tex, &prog_data->base, |
| nir, mem_ctx, false, shader_time_index), |
| input_vue_map(input_vue_map), key(key) |
| { |
| } |
| |
| |
| void |
| vec4_tcs_visitor::setup_payload() |
| { |
| int reg = 0; |
| |
| /* The payload always contains important data in r0, which contains |
| * the URB handles that are passed on to the URB write at the end |
| * of the thread. |
| */ |
| reg++; |
| |
| /* r1.0 - r4.7 may contain the input control point URB handles, |
| * which we use to pull vertex data. |
| */ |
| reg += 4; |
| |
| /* Push constants may start at r5.0 */ |
| reg = setup_uniforms(reg); |
| |
| this->first_non_payload_grf = reg; |
| } |
| |
| |
| void |
| vec4_tcs_visitor::emit_prolog() |
| { |
| invocation_id = src_reg(this, glsl_type::uint_type); |
| emit(TCS_OPCODE_GET_INSTANCE_ID, dst_reg(invocation_id)); |
| |
| /* HS threads are dispatched with the dispatch mask set to 0xFF. |
| * If there are an odd number of output vertices, then the final |
| * HS instance dispatched will only have its bottom half doing real |
| * work, and so we need to disable the upper half: |
| */ |
| if (nir->info.tess.tcs_vertices_out % 2) { |
| emit(CMP(dst_null_d(), invocation_id, |
| brw_imm_ud(nir->info.tess.tcs_vertices_out), |
| BRW_CONDITIONAL_L)); |
| |
| /* Matching ENDIF is in emit_thread_end() */ |
| emit(IF(BRW_PREDICATE_NORMAL)); |
| } |
| } |
| |
| |
| void |
| vec4_tcs_visitor::emit_thread_end() |
| { |
| vec4_instruction *inst; |
| current_annotation = "thread end"; |
| |
| if (nir->info.tess.tcs_vertices_out % 2) { |
| emit(BRW_OPCODE_ENDIF); |
| } |
| |
| if (devinfo->gen == 7) { |
| struct brw_tcs_prog_data *tcs_prog_data = |
| (struct brw_tcs_prog_data *) prog_data; |
| |
| current_annotation = "release input vertices"; |
| |
| /* Synchronize all threads, so we know that no one is still |
| * using the input URB handles. |
| */ |
| if (tcs_prog_data->instances > 1) { |
| dst_reg header = dst_reg(this, glsl_type::uvec4_type); |
| emit(TCS_OPCODE_CREATE_BARRIER_HEADER, header); |
| emit(SHADER_OPCODE_BARRIER, dst_null_ud(), src_reg(header)); |
| } |
| |
| /* Make thread 0 (invocations <1, 0>) release pairs of ICP handles. |
| * We want to compare the bottom half of invocation_id with 0, but |
| * use that truth value for the top half as well. Unfortunately, |
| * we don't have stride in the vec4 world, nor UV immediates in |
| * align16, so we need an opcode to get invocation_id<0,4,0>. |
| */ |
| set_condmod(BRW_CONDITIONAL_Z, |
| emit(TCS_OPCODE_SRC0_010_IS_ZERO, dst_null_d(), |
| invocation_id)); |
| emit(IF(BRW_PREDICATE_NORMAL)); |
| for (unsigned i = 0; i < key->input_vertices; i += 2) { |
| /* If we have an odd number of input vertices, the last will be |
| * unpaired. We don't want to use an interleaved URB write in |
| * that case. |
| */ |
| const bool is_unpaired = i == key->input_vertices - 1; |
| |
| dst_reg header(this, glsl_type::uvec4_type); |
| emit(TCS_OPCODE_RELEASE_INPUT, header, brw_imm_ud(i), |
| brw_imm_ud(is_unpaired)); |
| } |
| emit(BRW_OPCODE_ENDIF); |
| } |
| |
| if (unlikely(INTEL_DEBUG & DEBUG_SHADER_TIME)) |
| emit_shader_time_end(); |
| |
| inst = emit(TCS_OPCODE_THREAD_END); |
| inst->base_mrf = 14; |
| inst->mlen = 2; |
| } |
| |
| |
| void |
| vec4_tcs_visitor::emit_input_urb_read(const dst_reg &dst, |
| const src_reg &vertex_index, |
| unsigned base_offset, |
| unsigned first_component, |
| const src_reg &indirect_offset) |
| { |
| vec4_instruction *inst; |
| dst_reg temp(this, glsl_type::ivec4_type); |
| temp.type = dst.type; |
| |
| /* Set up the message header to reference the proper parts of the URB */ |
| dst_reg header = dst_reg(this, glsl_type::uvec4_type); |
| inst = emit(TCS_OPCODE_SET_INPUT_URB_OFFSETS, header, vertex_index, |
| indirect_offset); |
| inst->force_writemask_all = true; |
| |
| /* Read into a temporary, ignoring writemasking. */ |
| inst = emit(VEC4_OPCODE_URB_READ, temp, src_reg(header)); |
| inst->offset = base_offset; |
| inst->mlen = 1; |
| inst->base_mrf = -1; |
| |
| /* Copy the temporary to the destination to deal with writemasking. |
| * |
| * Also attempt to deal with gl_PointSize being in the .w component. |
| */ |
| if (inst->offset == 0 && indirect_offset.file == BAD_FILE) { |
| emit(MOV(dst, swizzle(src_reg(temp), BRW_SWIZZLE_WWWW))); |
| } else { |
| src_reg src = src_reg(temp); |
| src.swizzle = BRW_SWZ_COMP_INPUT(first_component); |
| emit(MOV(dst, src)); |
| } |
| } |
| |
| void |
| vec4_tcs_visitor::emit_output_urb_read(const dst_reg &dst, |
| unsigned base_offset, |
| unsigned first_component, |
| const src_reg &indirect_offset) |
| { |
| vec4_instruction *inst; |
| |
| /* Set up the message header to reference the proper parts of the URB */ |
| dst_reg header = dst_reg(this, glsl_type::uvec4_type); |
| inst = emit(TCS_OPCODE_SET_OUTPUT_URB_OFFSETS, header, |
| brw_imm_ud(dst.writemask << first_component), indirect_offset); |
| inst->force_writemask_all = true; |
| |
| vec4_instruction *read = emit(VEC4_OPCODE_URB_READ, dst, src_reg(header)); |
| read->offset = base_offset; |
| read->mlen = 1; |
| read->base_mrf = -1; |
| |
| if (first_component) { |
| /* Read into a temporary and copy with a swizzle and writemask. */ |
| read->dst = retype(dst_reg(this, glsl_type::ivec4_type), dst.type); |
| emit(MOV(dst, swizzle(src_reg(read->dst), |
| BRW_SWZ_COMP_INPUT(first_component)))); |
| } |
| } |
| |
| void |
| vec4_tcs_visitor::emit_urb_write(const src_reg &value, |
| unsigned writemask, |
| unsigned base_offset, |
| const src_reg &indirect_offset) |
| { |
| if (writemask == 0) |
| return; |
| |
| src_reg message(this, glsl_type::uvec4_type, 2); |
| vec4_instruction *inst; |
| |
| inst = emit(TCS_OPCODE_SET_OUTPUT_URB_OFFSETS, dst_reg(message), |
| brw_imm_ud(writemask), indirect_offset); |
| inst->force_writemask_all = true; |
| inst = emit(MOV(byte_offset(dst_reg(retype(message, value.type)), REG_SIZE), |
| value)); |
| inst->force_writemask_all = true; |
| |
| inst = emit(TCS_OPCODE_URB_WRITE, dst_null_f(), message); |
| inst->offset = base_offset; |
| inst->mlen = 2; |
| inst->base_mrf = -1; |
| } |
| |
| void |
| vec4_tcs_visitor::nir_emit_intrinsic(nir_intrinsic_instr *instr) |
| { |
| switch (instr->intrinsic) { |
| case nir_intrinsic_load_invocation_id: |
| emit(MOV(get_nir_dest(instr->dest, BRW_REGISTER_TYPE_UD), |
| invocation_id)); |
| break; |
| case nir_intrinsic_load_primitive_id: |
| emit(TCS_OPCODE_GET_PRIMITIVE_ID, |
| get_nir_dest(instr->dest, BRW_REGISTER_TYPE_UD)); |
| break; |
| case nir_intrinsic_load_patch_vertices_in: |
| emit(MOV(get_nir_dest(instr->dest, BRW_REGISTER_TYPE_D), |
| brw_imm_d(key->input_vertices))); |
| break; |
| case nir_intrinsic_load_per_vertex_input: { |
| assert(nir_dest_bit_size(instr->dest) == 32); |
| src_reg indirect_offset = get_indirect_offset(instr); |
| unsigned imm_offset = instr->const_index[0]; |
| |
| src_reg vertex_index = retype(get_nir_src_imm(instr->src[0]), |
| BRW_REGISTER_TYPE_UD); |
| |
| unsigned first_component = nir_intrinsic_component(instr); |
| dst_reg dst = get_nir_dest(instr->dest, BRW_REGISTER_TYPE_D); |
| dst.writemask = brw_writemask_for_size(instr->num_components); |
| emit_input_urb_read(dst, vertex_index, imm_offset, |
| first_component, indirect_offset); |
| break; |
| } |
| case nir_intrinsic_load_input: |
| unreachable("nir_lower_io should use load_per_vertex_input intrinsics"); |
| break; |
| case nir_intrinsic_load_output: |
| case nir_intrinsic_load_per_vertex_output: { |
| src_reg indirect_offset = get_indirect_offset(instr); |
| unsigned imm_offset = instr->const_index[0]; |
| |
| dst_reg dst = get_nir_dest(instr->dest, BRW_REGISTER_TYPE_D); |
| dst.writemask = brw_writemask_for_size(instr->num_components); |
| |
| emit_output_urb_read(dst, imm_offset, nir_intrinsic_component(instr), |
| indirect_offset); |
| break; |
| } |
| case nir_intrinsic_store_output: |
| case nir_intrinsic_store_per_vertex_output: { |
| assert(nir_src_bit_size(instr->src[0]) == 32); |
| src_reg value = get_nir_src(instr->src[0]); |
| unsigned mask = instr->const_index[1]; |
| unsigned swiz = BRW_SWIZZLE_XYZW; |
| |
| src_reg indirect_offset = get_indirect_offset(instr); |
| unsigned imm_offset = instr->const_index[0]; |
| |
| unsigned first_component = nir_intrinsic_component(instr); |
| if (first_component) { |
| assert(swiz == BRW_SWIZZLE_XYZW); |
| swiz = BRW_SWZ_COMP_OUTPUT(first_component); |
| mask = mask << first_component; |
| } |
| |
| emit_urb_write(swizzle(value, swiz), mask, |
| imm_offset, indirect_offset); |
| break; |
| } |
| |
| case nir_intrinsic_control_barrier: { |
| dst_reg header = dst_reg(this, glsl_type::uvec4_type); |
| emit(TCS_OPCODE_CREATE_BARRIER_HEADER, header); |
| emit(SHADER_OPCODE_BARRIER, dst_null_ud(), src_reg(header)); |
| break; |
| } |
| |
| case nir_intrinsic_memory_barrier_tcs_patch: |
| break; |
| |
| default: |
| vec4_visitor::nir_emit_intrinsic(instr); |
| } |
| } |
| |
| /** |
| * Return the number of patches to accumulate before an 8_PATCH mode thread is |
| * launched. In cases with a large number of input control points and a large |
| * amount of VS outputs, the VS URB space needed to store an entire 8 patches |
| * worth of data can be prohibitive, so it can be beneficial to launch threads |
| * early. |
| * |
| * See the 3DSTATE_HS::Patch Count Threshold documentation for the recommended |
| * values. Note that 0 means to "disable" early dispatch, meaning to wait for |
| * a full 8 patches as normal. |
| */ |
| static int |
| get_patch_count_threshold(int input_control_points) |
| { |
| if (input_control_points <= 4) |
| return 0; |
| else if (input_control_points <= 6) |
| return 5; |
| else if (input_control_points <= 8) |
| return 4; |
| else if (input_control_points <= 10) |
| return 3; |
| else if (input_control_points <= 14) |
| return 2; |
| |
| /* Return patch count 1 for PATCHLIST_15 - PATCHLIST_32 */ |
| return 1; |
| } |
| |
| extern "C" const unsigned * |
| brw_compile_tcs(const struct brw_compiler *compiler, |
| void *log_data, |
| void *mem_ctx, |
| const struct brw_tcs_prog_key *key, |
| struct brw_tcs_prog_data *prog_data, |
| nir_shader *nir, |
| int shader_time_index, |
| struct brw_compile_stats *stats, |
| char **error_str) |
| { |
| const struct gen_device_info *devinfo = compiler->devinfo; |
| struct brw_vue_prog_data *vue_prog_data = &prog_data->base; |
| const bool is_scalar = compiler->scalar_stage[MESA_SHADER_TESS_CTRL]; |
| const unsigned *assembly; |
| |
| nir->info.outputs_written = key->outputs_written; |
| nir->info.patch_outputs_written = key->patch_outputs_written; |
| |
| struct brw_vue_map input_vue_map; |
| brw_compute_vue_map(devinfo, &input_vue_map, nir->info.inputs_read, |
| nir->info.separate_shader, 1); |
| brw_compute_tess_vue_map(&vue_prog_data->vue_map, |
| nir->info.outputs_written, |
| nir->info.patch_outputs_written); |
| |
| brw_nir_apply_key(nir, compiler, &key->base, 8, is_scalar); |
| brw_nir_lower_vue_inputs(nir, &input_vue_map); |
| brw_nir_lower_tcs_outputs(nir, &vue_prog_data->vue_map, |
| key->tes_primitive_mode); |
| if (key->quads_workaround) |
| brw_nir_apply_tcs_quads_workaround(nir); |
| |
| brw_postprocess_nir(nir, compiler, is_scalar); |
| |
| bool has_primitive_id = |
| nir->info.system_values_read & (1 << SYSTEM_VALUE_PRIMITIVE_ID); |
| |
| prog_data->patch_count_threshold = get_patch_count_threshold(key->input_vertices); |
| |
| if (compiler->use_tcs_8_patch && |
| nir->info.tess.tcs_vertices_out <= (devinfo->gen >= 12 ? 32 : 16) && |
| 2 + has_primitive_id + key->input_vertices <= (devinfo->gen >= 12 ? 63 : 31)) { |
| /* 3DSTATE_HS imposes two constraints on using 8_PATCH mode. First, the |
| * "Instance" field limits the number of output vertices to [1, 16] on |
| * gen11 and below, or [1, 32] on gen12 and above. Secondly, the |
| * "Dispatch GRF Start Register for URB Data" field is limited to [0, |
| * 31] - which imposes a limit on the input vertices. |
| */ |
| vue_prog_data->dispatch_mode = DISPATCH_MODE_TCS_8_PATCH; |
| prog_data->instances = nir->info.tess.tcs_vertices_out; |
| prog_data->include_primitive_id = has_primitive_id; |
| } else { |
| unsigned verts_per_thread = is_scalar ? 8 : 2; |
| vue_prog_data->dispatch_mode = DISPATCH_MODE_TCS_SINGLE_PATCH; |
| prog_data->instances = |
| DIV_ROUND_UP(nir->info.tess.tcs_vertices_out, verts_per_thread); |
| } |
| |
| /* Compute URB entry size. The maximum allowed URB entry size is 32k. |
| * That divides up as follows: |
| * |
| * 32 bytes for the patch header (tessellation factors) |
| * 480 bytes for per-patch varyings (a varying component is 4 bytes and |
| * gl_MaxTessPatchComponents = 120) |
| * 16384 bytes for per-vertex varyings (a varying component is 4 bytes, |
| * gl_MaxPatchVertices = 32 and |
| * gl_MaxTessControlOutputComponents = 128) |
| * |
| * 15808 bytes left for varying packing overhead |
| */ |
| const int num_per_patch_slots = vue_prog_data->vue_map.num_per_patch_slots; |
| const int num_per_vertex_slots = vue_prog_data->vue_map.num_per_vertex_slots; |
| unsigned output_size_bytes = 0; |
| /* Note that the patch header is counted in num_per_patch_slots. */ |
| output_size_bytes += num_per_patch_slots * 16; |
| output_size_bytes += nir->info.tess.tcs_vertices_out * |
| num_per_vertex_slots * 16; |
| |
| assert(output_size_bytes >= 1); |
| if (output_size_bytes > GEN7_MAX_HS_URB_ENTRY_SIZE_BYTES) |
| return NULL; |
| |
| /* URB entry sizes are stored as a multiple of 64 bytes. */ |
| vue_prog_data->urb_entry_size = ALIGN(output_size_bytes, 64) / 64; |
| |
| /* On Cannonlake software shall not program an allocation size that |
| * specifies a size that is a multiple of 3 64B (512-bit) cachelines. |
| */ |
| if (devinfo->gen == 10 && |
| vue_prog_data->urb_entry_size % 3 == 0) |
| vue_prog_data->urb_entry_size++; |
| |
| /* HS does not use the usual payload pushing from URB to GRFs, |
| * because we don't have enough registers for a full-size payload, and |
| * the hardware is broken on Haswell anyway. |
| */ |
| vue_prog_data->urb_read_length = 0; |
| |
| if (unlikely(INTEL_DEBUG & DEBUG_TCS)) { |
| fprintf(stderr, "TCS Input "); |
| brw_print_vue_map(stderr, &input_vue_map); |
| fprintf(stderr, "TCS Output "); |
| brw_print_vue_map(stderr, &vue_prog_data->vue_map); |
| } |
| |
| if (is_scalar) { |
| fs_visitor v(compiler, log_data, mem_ctx, &key->base, |
| &prog_data->base.base, nir, 8, |
| shader_time_index, &input_vue_map); |
| if (!v.run_tcs()) { |
| if (error_str) |
| *error_str = ralloc_strdup(mem_ctx, v.fail_msg); |
| return NULL; |
| } |
| |
| prog_data->base.base.dispatch_grf_start_reg = v.payload.num_regs; |
| |
| fs_generator g(compiler, log_data, mem_ctx, |
| &prog_data->base.base, false, MESA_SHADER_TESS_CTRL); |
| if (unlikely(INTEL_DEBUG & DEBUG_TCS)) { |
| g.enable_debug(ralloc_asprintf(mem_ctx, |
| "%s tessellation control shader %s", |
| nir->info.label ? nir->info.label |
| : "unnamed", |
| nir->info.name)); |
| } |
| |
| g.generate_code(v.cfg, 8, v.shader_stats, |
| v.performance_analysis.require(), stats); |
| |
| g.add_const_data(nir->constant_data, nir->constant_data_size); |
| |
| assembly = g.get_assembly(); |
| } else { |
| vec4_tcs_visitor v(compiler, log_data, key, prog_data, |
| nir, mem_ctx, shader_time_index, &input_vue_map); |
| if (!v.run()) { |
| if (error_str) |
| *error_str = ralloc_strdup(mem_ctx, v.fail_msg); |
| return NULL; |
| } |
| |
| if (unlikely(INTEL_DEBUG & DEBUG_TCS)) |
| v.dump_instructions(); |
| |
| |
| assembly = brw_vec4_generate_assembly(compiler, log_data, mem_ctx, nir, |
| &prog_data->base, v.cfg, |
| v.performance_analysis.require(), |
| stats); |
| } |
| |
| return assembly; |
| } |
| |
| |
| } /* namespace brw */ |
