/* * Copyright © 2010 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. */ #include "glsl/ir.h" #include "glsl/ir_optimization.h" #include "glsl/nir/glsl_to_nir.h" #include "program/prog_to_nir.h" #include "brw_fs.h" #include "brw_nir.h" void fs_visitor::emit_nir_code() { nir_shader *nir = prog->nir; /* emit the arrays used for inputs and outputs - load/store intrinsics will * be converted to reads/writes of these arrays */ if (nir->num_inputs > 0) { nir_inputs = vgrf(nir->num_inputs); nir_setup_inputs(nir); } if (nir->num_outputs > 0) { nir_outputs = vgrf(nir->num_outputs); nir_setup_outputs(nir); } if (nir->num_uniforms > 0) { nir_setup_uniforms(nir); } nir_emit_system_values(nir); nir_globals = ralloc_array(mem_ctx, fs_reg, nir->reg_alloc); foreach_list_typed(nir_register, reg, node, &nir->registers) { unsigned array_elems = reg->num_array_elems == 0 ? 1 : reg->num_array_elems; unsigned size = array_elems * reg->num_components; nir_globals[reg->index] = vgrf(size); } /* get the main function and emit it */ nir_foreach_overload(nir, overload) { assert(strcmp(overload->function->name, "main") == 0); assert(overload->impl); nir_emit_impl(overload->impl); } } void fs_visitor::nir_setup_inputs(nir_shader *shader) { foreach_list_typed(nir_variable, var, node, &shader->inputs) { enum brw_reg_type type = brw_type_for_base_type(var->type); fs_reg input = offset(nir_inputs, var->data.driver_location); fs_reg reg; switch (stage) { case MESA_SHADER_VERTEX: { /* Our ATTR file is indexed by VERT_ATTRIB_*, which is the value * stored in nir_variable::location. * * However, NIR's load_input intrinsics use a different index - an * offset into a single contiguous array containing all inputs. * This index corresponds to the nir_variable::driver_location field. * * So, we need to copy from fs_reg(ATTR, var->location) to * offset(nir_inputs, var->data.driver_location). */ unsigned components = var->type->without_array()->components(); unsigned array_length = var->type->is_array() ? var->type->length : 1; for (unsigned i = 0; i < array_length; i++) { for (unsigned j = 0; j < components; j++) { emit(MOV(retype(offset(input, components * i + j), type), offset(fs_reg(ATTR, var->data.location + i, type), j))); } } break; } case MESA_SHADER_GEOMETRY: case MESA_SHADER_COMPUTE: unreachable("fs_visitor not used for these stages yet."); break; case MESA_SHADER_FRAGMENT: if (var->data.location == VARYING_SLOT_POS) { reg = *emit_fragcoord_interpolation(var->data.pixel_center_integer, var->data.origin_upper_left); emit_percomp(MOV(input, reg), 0xF); } else { emit_general_interpolation(input, var->name, var->type, (glsl_interp_qualifier) var->data.interpolation, var->data.location, var->data.centroid, var->data.sample); } break; } } } void fs_visitor::nir_setup_outputs(nir_shader *shader) { brw_wm_prog_key *key = (brw_wm_prog_key*) this->key; foreach_list_typed(nir_variable, var, node, &shader->outputs) { fs_reg reg = offset(nir_outputs, var->data.driver_location); int vector_elements = var->type->is_array() ? var->type->fields.array->vector_elements : var->type->vector_elements; if (stage == MESA_SHADER_VERTEX) { for (int i = 0; i < ALIGN(type_size(var->type), 4) / 4; i++) { int output = var->data.location + i; this->outputs[output] = offset(reg, 4 * i); this->output_components[output] = vector_elements; } } else if (var->data.index > 0) { assert(var->data.location == FRAG_RESULT_DATA0); assert(var->data.index == 1); this->dual_src_output = reg; this->do_dual_src = true; } else if (var->data.location == FRAG_RESULT_COLOR) { /* Writing gl_FragColor outputs to all color regions. */ for (unsigned int i = 0; i < MAX2(key->nr_color_regions, 1); i++) { this->outputs[i] = reg; this->output_components[i] = 4; } } else if (var->data.location == FRAG_RESULT_DEPTH) { this->frag_depth = reg; } else if (var->data.location == FRAG_RESULT_SAMPLE_MASK) { this->sample_mask = reg; } else { /* gl_FragData or a user-defined FS output */ assert(var->data.location >= FRAG_RESULT_DATA0 && var->data.location < FRAG_RESULT_DATA0 + BRW_MAX_DRAW_BUFFERS); /* General color output. */ for (unsigned int i = 0; i < MAX2(1, var->type->length); i++) { int output = var->data.location - FRAG_RESULT_DATA0 + i; this->outputs[output] = offset(reg, vector_elements * i); this->output_components[output] = vector_elements; } } } } void fs_visitor::nir_setup_uniforms(nir_shader *shader) { uniforms = shader->num_uniforms; num_direct_uniforms = shader->num_direct_uniforms; /* We split the uniform register file in half. The first half is * entirely direct uniforms. The second half is indirect. */ param_size[0] = num_direct_uniforms; if (shader->num_uniforms > num_direct_uniforms) param_size[num_direct_uniforms] = shader->num_uniforms - num_direct_uniforms; if (dispatch_width != 8) return; if (shader_prog) { foreach_list_typed(nir_variable, var, node, &shader->uniforms) { /* UBO's and atomics don't take up space in the uniform file */ if (var->interface_type != NULL || var->type->contains_atomic()) continue; if (strncmp(var->name, "gl_", 3) == 0) nir_setup_builtin_uniform(var); else nir_setup_uniform(var); } } else { /* prog_to_nir doesn't create uniform variables; set param up directly. */ for (unsigned p = 0; p < prog->Parameters->NumParameters; p++) { for (unsigned int i = 0; i < 4; i++) { stage_prog_data->param[4 * p + i] = &prog->Parameters->ParameterValues[p][i]; } } } } void fs_visitor::nir_setup_uniform(nir_variable *var) { int namelen = strlen(var->name); /* The data for our (non-builtin) uniforms is stored in a series of * gl_uniform_driver_storage structs for each subcomponent that * glGetUniformLocation() could name. We know it's been set up in the * same order we'd walk the type, so walk the list of storage and find * anything with our name, or the prefix of a component that starts with * our name. */ unsigned index = var->data.driver_location; for (unsigned u = 0; u < shader_prog->NumUserUniformStorage; u++) { struct gl_uniform_storage *storage = &shader_prog->UniformStorage[u]; if (strncmp(var->name, storage->name, namelen) != 0 || (storage->name[namelen] != 0 && storage->name[namelen] != '.' && storage->name[namelen] != '[')) { continue; } unsigned slots = storage->type->component_slots(); if (storage->array_elements) slots *= storage->array_elements; for (unsigned i = 0; i < slots; i++) { stage_prog_data->param[index++] = &storage->storage[i]; } } /* Make sure we actually initialized the right amount of stuff here. */ assert(var->data.driver_location + var->type->component_slots() == index); } void fs_visitor::nir_setup_builtin_uniform(nir_variable *var) { const nir_state_slot *const slots = var->state_slots; assert(var->state_slots != NULL); unsigned uniform_index = var->data.driver_location; for (unsigned int i = 0; i < var->num_state_slots; i++) { /* This state reference has already been setup by ir_to_mesa, but we'll * get the same index back here. */ int index = _mesa_add_state_reference(this->prog->Parameters, (gl_state_index *)slots[i].tokens); /* Add each of the unique swizzles of the element as a parameter. * This'll end up matching the expected layout of the * array/matrix/structure we're trying to fill in. */ int last_swiz = -1; for (unsigned int j = 0; j < 4; j++) { int swiz = GET_SWZ(slots[i].swizzle, j); if (swiz == last_swiz) break; last_swiz = swiz; stage_prog_data->param[uniform_index++] = &prog->Parameters->ParameterValues[index][swiz]; } } } static bool emit_system_values_block(nir_block *block, void *void_visitor) { fs_visitor *v = (fs_visitor *)void_visitor; fs_reg *reg; nir_foreach_instr(block, instr) { if (instr->type != nir_instr_type_intrinsic) continue; nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr); switch (intrin->intrinsic) { case nir_intrinsic_load_vertex_id: unreachable("should be lowered by lower_vertex_id()."); case nir_intrinsic_load_vertex_id_zero_base: assert(v->stage == MESA_SHADER_VERTEX); reg = &v->nir_system_values[SYSTEM_VALUE_VERTEX_ID_ZERO_BASE]; if (reg->file == BAD_FILE) *reg = *v->emit_vs_system_value(SYSTEM_VALUE_VERTEX_ID_ZERO_BASE); break; case nir_intrinsic_load_base_vertex: assert(v->stage == MESA_SHADER_VERTEX); reg = &v->nir_system_values[SYSTEM_VALUE_BASE_VERTEX]; if (reg->file == BAD_FILE) *reg = *v->emit_vs_system_value(SYSTEM_VALUE_BASE_VERTEX); break; case nir_intrinsic_load_instance_id: assert(v->stage == MESA_SHADER_VERTEX); reg = &v->nir_system_values[SYSTEM_VALUE_INSTANCE_ID]; if (reg->file == BAD_FILE) *reg = *v->emit_vs_system_value(SYSTEM_VALUE_INSTANCE_ID); break; case nir_intrinsic_load_sample_pos: assert(v->stage == MESA_SHADER_FRAGMENT); reg = &v->nir_system_values[SYSTEM_VALUE_SAMPLE_POS]; if (reg->file == BAD_FILE) *reg = *v->emit_samplepos_setup(); break; case nir_intrinsic_load_sample_id: assert(v->stage == MESA_SHADER_FRAGMENT); reg = &v->nir_system_values[SYSTEM_VALUE_SAMPLE_ID]; if (reg->file == BAD_FILE) *reg = *v->emit_sampleid_setup(); break; case nir_intrinsic_load_sample_mask_in: assert(v->stage == MESA_SHADER_FRAGMENT); assert(v->devinfo->gen >= 7); reg = &v->nir_system_values[SYSTEM_VALUE_SAMPLE_MASK_IN]; if (reg->file == BAD_FILE) *reg = fs_reg(retype(brw_vec8_grf(v->payload.sample_mask_in_reg, 0), BRW_REGISTER_TYPE_D)); break; default: break; } } return true; } void fs_visitor::nir_emit_system_values(nir_shader *shader) { nir_system_values = ralloc_array(mem_ctx, fs_reg, SYSTEM_VALUE_MAX); nir_foreach_overload(shader, overload) { assert(strcmp(overload->function->name, "main") == 0); assert(overload->impl); nir_foreach_block(overload->impl, emit_system_values_block, this); } } void fs_visitor::nir_emit_impl(nir_function_impl *impl) { nir_locals = reralloc(mem_ctx, nir_locals, fs_reg, impl->reg_alloc); foreach_list_typed(nir_register, reg, node, &impl->registers) { unsigned array_elems = reg->num_array_elems == 0 ? 1 : reg->num_array_elems; unsigned size = array_elems * reg->num_components; nir_locals[reg->index] = vgrf(size); } nir_emit_cf_list(&impl->body); } void fs_visitor::nir_emit_cf_list(exec_list *list) { exec_list_validate(list); foreach_list_typed(nir_cf_node, node, node, list) { switch (node->type) { case nir_cf_node_if: nir_emit_if(nir_cf_node_as_if(node)); break; case nir_cf_node_loop: nir_emit_loop(nir_cf_node_as_loop(node)); break; case nir_cf_node_block: nir_emit_block(nir_cf_node_as_block(node)); break; default: unreachable("Invalid CFG node block"); } } } void fs_visitor::nir_emit_if(nir_if *if_stmt) { /* first, put the condition into f0 */ fs_inst *inst = emit(MOV(reg_null_d, retype(get_nir_src(if_stmt->condition), BRW_REGISTER_TYPE_D))); inst->conditional_mod = BRW_CONDITIONAL_NZ; emit(IF(BRW_PREDICATE_NORMAL)); nir_emit_cf_list(&if_stmt->then_list); /* note: if the else is empty, dead CF elimination will remove it */ emit(BRW_OPCODE_ELSE); nir_emit_cf_list(&if_stmt->else_list); emit(BRW_OPCODE_ENDIF); if (!try_replace_with_sel() && devinfo->gen < 6) { no16("Can't support (non-uniform) control flow on SIMD16\n"); } } void fs_visitor::nir_emit_loop(nir_loop *loop) { if (devinfo->gen < 6) { no16("Can't support (non-uniform) control flow on SIMD16\n"); } emit(BRW_OPCODE_DO); nir_emit_cf_list(&loop->body); emit(BRW_OPCODE_WHILE); } void fs_visitor::nir_emit_block(nir_block *block) { nir_foreach_instr(block, instr) { nir_emit_instr(instr); } } void fs_visitor::nir_emit_instr(nir_instr *instr) { this->base_ir = instr; switch (instr->type) { case nir_instr_type_alu: nir_emit_alu(nir_instr_as_alu(instr)); break; case nir_instr_type_intrinsic: nir_emit_intrinsic(nir_instr_as_intrinsic(instr)); break; case nir_instr_type_tex: nir_emit_texture(nir_instr_as_tex(instr)); break; case nir_instr_type_load_const: /* We can hit these, but we do nothing now and use them as * immediates later. */ break; case nir_instr_type_jump: nir_emit_jump(nir_instr_as_jump(instr)); break; default: unreachable("unknown instruction type"); } this->base_ir = NULL; } static brw_reg_type brw_type_for_nir_type(nir_alu_type type) { switch (type) { case nir_type_unsigned: return BRW_REGISTER_TYPE_UD; case nir_type_bool: case nir_type_int: return BRW_REGISTER_TYPE_D; case nir_type_float: return BRW_REGISTER_TYPE_F; default: unreachable("unknown type"); } return BRW_REGISTER_TYPE_F; } bool fs_visitor::optimize_frontfacing_ternary(nir_alu_instr *instr, const fs_reg &result) { if (instr->src[0].src.is_ssa || !instr->src[0].src.reg.reg || !instr->src[0].src.reg.reg->parent_instr) return false; if (instr->src[0].src.reg.reg->parent_instr->type != nir_instr_type_intrinsic) return false; nir_intrinsic_instr *src0 = nir_instr_as_intrinsic(instr->src[0].src.reg.reg->parent_instr); if (src0->intrinsic != nir_intrinsic_load_front_face) return false; nir_const_value *value1 = nir_src_as_const_value(instr->src[1].src); if (!value1 || fabsf(value1->f[0]) != 1.0f) return false; nir_const_value *value2 = nir_src_as_const_value(instr->src[2].src); if (!value2 || fabsf(value2->f[0]) != 1.0f) return false; fs_reg tmp = vgrf(glsl_type::int_type); if (devinfo->gen >= 6) { /* Bit 15 of g0.0 is 0 if the polygon is front facing. */ fs_reg g0 = fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_W)); /* For (gl_FrontFacing ? 1.0 : -1.0), emit: * * or(8) tmp.1<2>W g0.0<0,1,0>W 0x00003f80W * and(8) dst<1>D tmp<8,8,1>D 0xbf800000D * * and negate g0.0<0,1,0>W for (gl_FrontFacing ? -1.0 : 1.0). * * This negation looks like it's safe in practice, because bits 0:4 will * surely be TRIANGLES */ if (value1->f[0] == -1.0f) { g0.negate = true; } tmp.type = BRW_REGISTER_TYPE_W; tmp.subreg_offset = 2; tmp.stride = 2; fs_inst *or_inst = emit(OR(tmp, g0, fs_reg(0x3f80))); or_inst->src[1].type = BRW_REGISTER_TYPE_UW; tmp.type = BRW_REGISTER_TYPE_D; tmp.subreg_offset = 0; tmp.stride = 1; } else { /* Bit 31 of g1.6 is 0 if the polygon is front facing. */ fs_reg g1_6 = fs_reg(retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_D)); /* For (gl_FrontFacing ? 1.0 : -1.0), emit: * * or(8) tmp<1>D g1.6<0,1,0>D 0x3f800000D * and(8) dst<1>D tmp<8,8,1>D 0xbf800000D * * and negate g1.6<0,1,0>D for (gl_FrontFacing ? -1.0 : 1.0). * * This negation looks like it's safe in practice, because bits 0:4 will * surely be TRIANGLES */ if (value1->f[0] == -1.0f) { g1_6.negate = true; } emit(OR(tmp, g1_6, fs_reg(0x3f800000))); } emit(AND(retype(result, BRW_REGISTER_TYPE_D), tmp, fs_reg(0xbf800000))); return true; } void fs_visitor::nir_emit_alu(nir_alu_instr *instr) { struct brw_wm_prog_key *fs_key = (struct brw_wm_prog_key *) this->key; fs_inst *inst; fs_reg result = get_nir_dest(instr->dest.dest); result.type = brw_type_for_nir_type(nir_op_infos[instr->op].output_type); fs_reg op[4]; for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++) { op[i] = get_nir_src(instr->src[i].src); op[i].type = brw_type_for_nir_type(nir_op_infos[instr->op].input_types[i]); op[i].abs = instr->src[i].abs; op[i].negate = instr->src[i].negate; } /* We get a bunch of mov's out of the from_ssa pass and they may still * be vectorized. We'll handle them as a special-case. We'll also * handle vecN here because it's basically the same thing. */ switch (instr->op) { case nir_op_imov: case nir_op_fmov: case nir_op_vec2: case nir_op_vec3: case nir_op_vec4: { fs_reg temp = result; bool need_extra_copy = false; for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++) { if (!instr->src[i].src.is_ssa && instr->dest.dest.reg.reg == instr->src[i].src.reg.reg) { need_extra_copy = true; temp = retype(vgrf(4), result.type); break; } } for (unsigned i = 0; i < 4; i++) { if (!(instr->dest.write_mask & (1 << i))) continue; if (instr->op == nir_op_imov || instr->op == nir_op_fmov) { inst = emit(MOV(offset(temp, i), offset(op[0], instr->src[0].swizzle[i]))); } else { inst = emit(MOV(offset(temp, i), offset(op[i], instr->src[i].swizzle[0]))); } inst->saturate = instr->dest.saturate; } /* In this case the source and destination registers were the same, * so we need to insert an extra set of moves in order to deal with * any swizzling. */ if (need_extra_copy) { for (unsigned i = 0; i < 4; i++) { if (!(instr->dest.write_mask & (1 << i))) continue; emit(MOV(offset(result, i), offset(temp, i))); } } return; } default: break; } /* At this point, we have dealt with any instruction that operates on * more than a single channel. Therefore, we can just adjust the source * and destination registers for that channel and emit the instruction. */ unsigned channel = 0; if (nir_op_infos[instr->op].output_size == 0) { /* Since NIR is doing the scalarizing for us, we should only ever see * vectorized operations with a single channel. */ assert(_mesa_bitcount(instr->dest.write_mask) == 1); channel = ffs(instr->dest.write_mask) - 1; result = offset(result, channel); } for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++) { assert(nir_op_infos[instr->op].input_sizes[i] < 2); op[i] = offset(op[i], instr->src[i].swizzle[channel]); } switch (instr->op) { case nir_op_i2f: case nir_op_u2f: inst = emit(MOV(result, op[0])); inst->saturate = instr->dest.saturate; break; case nir_op_f2i: case nir_op_f2u: emit(MOV(result, op[0])); break; case nir_op_fsign: { /* AND(val, 0x80000000) gives the sign bit. * * Predicated OR ORs 1.0 (0x3f800000) with the sign bit if val is not * zero. */ emit(CMP(reg_null_f, op[0], fs_reg(0.0f), BRW_CONDITIONAL_NZ)); fs_reg result_int = retype(result, BRW_REGISTER_TYPE_UD); op[0].type = BRW_REGISTER_TYPE_UD; result.type = BRW_REGISTER_TYPE_UD; emit(AND(result_int, op[0], fs_reg(0x80000000u))); inst = emit(OR(result_int, result_int, fs_reg(0x3f800000u))); inst->predicate = BRW_PREDICATE_NORMAL; if (instr->dest.saturate) { inst = emit(MOV(result, result)); inst->saturate = true; } break; } case nir_op_isign: /* ASR(val, 31) -> negative val generates 0xffffffff (signed -1). * -> non-negative val generates 0x00000000. * Predicated OR sets 1 if val is positive. */ emit(CMP(reg_null_d, op[0], fs_reg(0), BRW_CONDITIONAL_G)); emit(ASR(result, op[0], fs_reg(31))); inst = emit(OR(result, result, fs_reg(1))); inst->predicate = BRW_PREDICATE_NORMAL; break; case nir_op_frcp: inst = emit_math(SHADER_OPCODE_RCP, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_fexp2: inst = emit_math(SHADER_OPCODE_EXP2, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_flog2: inst = emit_math(SHADER_OPCODE_LOG2, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_fexp: case nir_op_flog: unreachable("not reached: should be handled by ir_explog_to_explog2"); case nir_op_fsin: inst = emit_math(SHADER_OPCODE_SIN, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_fcos: inst = emit_math(SHADER_OPCODE_COS, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_fddx: if (fs_key->high_quality_derivatives) { inst = emit(FS_OPCODE_DDX_FINE, result, op[0]); } else { inst = emit(FS_OPCODE_DDX_COARSE, result, op[0]); } inst->saturate = instr->dest.saturate; break; case nir_op_fddx_fine: inst = emit(FS_OPCODE_DDX_FINE, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_fddx_coarse: inst = emit(FS_OPCODE_DDX_COARSE, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_fddy: if (fs_key->high_quality_derivatives) { inst = emit(FS_OPCODE_DDY_FINE, result, op[0], fs_reg(fs_key->render_to_fbo)); } else { inst = emit(FS_OPCODE_DDY_COARSE, result, op[0], fs_reg(fs_key->render_to_fbo)); } inst->saturate = instr->dest.saturate; break; case nir_op_fddy_fine: inst = emit(FS_OPCODE_DDY_FINE, result, op[0], fs_reg(fs_key->render_to_fbo)); inst->saturate = instr->dest.saturate; break; case nir_op_fddy_coarse: inst = emit(FS_OPCODE_DDY_COARSE, result, op[0], fs_reg(fs_key->render_to_fbo)); inst->saturate = instr->dest.saturate; break; case nir_op_fadd: case nir_op_iadd: inst = emit(ADD(result, op[0], op[1])); inst->saturate = instr->dest.saturate; break; case nir_op_fmul: inst = emit(MUL(result, op[0], op[1])); inst->saturate = instr->dest.saturate; break; case nir_op_imul: { if (devinfo->gen >= 8) { emit(MUL(result, op[0], op[1])); break; } else { nir_const_value *value0 = nir_src_as_const_value(instr->src[0].src); nir_const_value *value1 = nir_src_as_const_value(instr->src[1].src); if (value0 && value0->u[0] < (1 << 16)) { if (devinfo->gen < 7) { emit(MUL(result, op[0], op[1])); } else { emit(MUL(result, op[1], op[0])); } break; } else if (value1 && value1->u[0] < (1 << 16)) { if (devinfo->gen < 7) { emit(MUL(result, op[1], op[0])); } else { emit(MUL(result, op[0], op[1])); } break; } } if (devinfo->gen >= 7) no16("SIMD16 explicit accumulator operands unsupported\n"); struct brw_reg acc = retype(brw_acc_reg(dispatch_width), result.type); emit(MUL(acc, op[0], op[1])); emit(MACH(reg_null_d, op[0], op[1])); emit(MOV(result, fs_reg(acc))); break; } case nir_op_imul_high: case nir_op_umul_high: { if (devinfo->gen >= 7) no16("SIMD16 explicit accumulator operands unsupported\n"); struct brw_reg acc = retype(brw_acc_reg(dispatch_width), result.type); fs_inst *mul = emit(MUL(acc, op[0], op[1])); emit(MACH(result, op[0], op[1])); /* Until Gen8, integer multiplies read 32-bits from one source, and * 16-bits from the other, and relying on the MACH instruction to * generate the high bits of the result. * * On Gen8, the multiply instruction does a full 32x32-bit multiply, * but in order to do a 64x64-bit multiply we have to simulate the * previous behavior and then use a MACH instruction. * * FINISHME: Don't use source modifiers on src1. */ if (devinfo->gen >= 8) { assert(mul->src[1].type == BRW_REGISTER_TYPE_D || mul->src[1].type == BRW_REGISTER_TYPE_UD); if (mul->src[1].type == BRW_REGISTER_TYPE_D) { mul->src[1].type = BRW_REGISTER_TYPE_W; mul->src[1].stride = 2; } else { mul->src[1].type = BRW_REGISTER_TYPE_UW; mul->src[1].stride = 2; } } break; } case nir_op_idiv: case nir_op_udiv: emit_math(SHADER_OPCODE_INT_QUOTIENT, result, op[0], op[1]); break; case nir_op_uadd_carry: { if (devinfo->gen >= 7) no16("SIMD16 explicit accumulator operands unsupported\n"); struct brw_reg acc = retype(brw_acc_reg(dispatch_width), BRW_REGISTER_TYPE_UD); emit(ADDC(reg_null_ud, op[0], op[1])); emit(MOV(result, fs_reg(acc))); break; } case nir_op_usub_borrow: { if (devinfo->gen >= 7) no16("SIMD16 explicit accumulator operands unsupported\n"); struct brw_reg acc = retype(brw_acc_reg(dispatch_width), BRW_REGISTER_TYPE_UD); emit(SUBB(reg_null_ud, op[0], op[1])); emit(MOV(result, fs_reg(acc))); break; } case nir_op_umod: emit_math(SHADER_OPCODE_INT_REMAINDER, result, op[0], op[1]); break; case nir_op_flt: case nir_op_ilt: case nir_op_ult: emit(CMP(result, op[0], op[1], BRW_CONDITIONAL_L)); break; case nir_op_fge: case nir_op_ige: case nir_op_uge: emit(CMP(result, op[0], op[1], BRW_CONDITIONAL_GE)); break; case nir_op_feq: case nir_op_ieq: emit(CMP(result, op[0], op[1], BRW_CONDITIONAL_Z)); break; case nir_op_fne: case nir_op_ine: emit(CMP(result, op[0], op[1], BRW_CONDITIONAL_NZ)); break; case nir_op_inot: if (devinfo->gen >= 8) { resolve_source_modifiers(&op[0]); } emit(NOT(result, op[0])); break; case nir_op_ixor: if (devinfo->gen >= 8) { resolve_source_modifiers(&op[0]); resolve_source_modifiers(&op[1]); } emit(XOR(result, op[0], op[1])); break; case nir_op_ior: if (devinfo->gen >= 8) { resolve_source_modifiers(&op[0]); resolve_source_modifiers(&op[1]); } emit(OR(result, op[0], op[1])); break; case nir_op_iand: if (devinfo->gen >= 8) { resolve_source_modifiers(&op[0]); resolve_source_modifiers(&op[1]); } emit(AND(result, op[0], op[1])); break; case nir_op_fdot2: case nir_op_fdot3: case nir_op_fdot4: case nir_op_bany2: case nir_op_bany3: case nir_op_bany4: case nir_op_ball2: case nir_op_ball3: case nir_op_ball4: case nir_op_ball_fequal2: case nir_op_ball_iequal2: case nir_op_ball_fequal3: case nir_op_ball_iequal3: case nir_op_ball_fequal4: case nir_op_ball_iequal4: case nir_op_bany_fnequal2: case nir_op_bany_inequal2: case nir_op_bany_fnequal3: case nir_op_bany_inequal3: case nir_op_bany_fnequal4: case nir_op_bany_inequal4: unreachable("Lowered by nir_lower_alu_reductions"); case nir_op_fnoise1_1: case nir_op_fnoise1_2: case nir_op_fnoise1_3: case nir_op_fnoise1_4: case nir_op_fnoise2_1: case nir_op_fnoise2_2: case nir_op_fnoise2_3: case nir_op_fnoise2_4: case nir_op_fnoise3_1: case nir_op_fnoise3_2: case nir_op_fnoise3_3: case nir_op_fnoise3_4: case nir_op_fnoise4_1: case nir_op_fnoise4_2: case nir_op_fnoise4_3: case nir_op_fnoise4_4: unreachable("not reached: should be handled by lower_noise"); case nir_op_ldexp: unreachable("not reached: should be handled by ldexp_to_arith()"); case nir_op_fsqrt: inst = emit_math(SHADER_OPCODE_SQRT, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_frsq: inst = emit_math(SHADER_OPCODE_RSQ, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_b2i: emit(AND(result, op[0], fs_reg(1))); break; case nir_op_b2f: emit(AND(retype(result, BRW_REGISTER_TYPE_UD), op[0], fs_reg(0x3f800000u))); break; case nir_op_f2b: emit(CMP(result, op[0], fs_reg(0.0f), BRW_CONDITIONAL_NZ)); break; case nir_op_i2b: emit(CMP(result, op[0], fs_reg(0), BRW_CONDITIONAL_NZ)); break; case nir_op_ftrunc: inst = emit(RNDZ(result, op[0])); inst->saturate = instr->dest.saturate; break; case nir_op_fceil: { op[0].negate = !op[0].negate; fs_reg temp = vgrf(glsl_type::float_type); emit(RNDD(temp, op[0])); temp.negate = true; inst = emit(MOV(result, temp)); inst->saturate = instr->dest.saturate; break; } case nir_op_ffloor: inst = emit(RNDD(result, op[0])); inst->saturate = instr->dest.saturate; break; case nir_op_ffract: inst = emit(FRC(result, op[0])); inst->saturate = instr->dest.saturate; break; case nir_op_fround_even: inst = emit(RNDE(result, op[0])); inst->saturate = instr->dest.saturate; break; case nir_op_fmin: case nir_op_imin: case nir_op_umin: if (devinfo->gen >= 6) { inst = emit(BRW_OPCODE_SEL, result, op[0], op[1]); inst->conditional_mod = BRW_CONDITIONAL_L; } else { emit(CMP(reg_null_d, op[0], op[1], BRW_CONDITIONAL_L)); inst = emit(SEL(result, op[0], op[1])); inst->predicate = BRW_PREDICATE_NORMAL; } inst->saturate = instr->dest.saturate; break; case nir_op_fmax: case nir_op_imax: case nir_op_umax: if (devinfo->gen >= 6) { inst = emit(BRW_OPCODE_SEL, result, op[0], op[1]); inst->conditional_mod = BRW_CONDITIONAL_GE; } else { emit(CMP(reg_null_d, op[0], op[1], BRW_CONDITIONAL_GE)); inst = emit(SEL(result, op[0], op[1])); inst->predicate = BRW_PREDICATE_NORMAL; } inst->saturate = instr->dest.saturate; break; case nir_op_pack_snorm_2x16: case nir_op_pack_snorm_4x8: case nir_op_pack_unorm_2x16: case nir_op_pack_unorm_4x8: case nir_op_unpack_snorm_2x16: case nir_op_unpack_snorm_4x8: case nir_op_unpack_unorm_2x16: case nir_op_unpack_unorm_4x8: case nir_op_unpack_half_2x16: case nir_op_pack_half_2x16: unreachable("not reached: should be handled by lower_packing_builtins"); case nir_op_unpack_half_2x16_split_x: inst = emit(FS_OPCODE_UNPACK_HALF_2x16_SPLIT_X, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_unpack_half_2x16_split_y: inst = emit(FS_OPCODE_UNPACK_HALF_2x16_SPLIT_Y, result, op[0]); inst->saturate = instr->dest.saturate; break; case nir_op_fpow: inst = emit_math(SHADER_OPCODE_POW, result, op[0], op[1]); inst->saturate = instr->dest.saturate; break; case nir_op_bitfield_reverse: emit(BFREV(result, op[0])); break; case nir_op_bit_count: emit(CBIT(result, op[0])); break; case nir_op_ufind_msb: case nir_op_ifind_msb: { emit(FBH(retype(result, BRW_REGISTER_TYPE_UD), op[0])); /* FBH counts from the MSB side, while GLSL's findMSB() wants the count * from the LSB side. If FBH didn't return an error (0xFFFFFFFF), then * subtract the result from 31 to convert the MSB count into an LSB count. */ emit(CMP(reg_null_d, result, fs_reg(-1), BRW_CONDITIONAL_NZ)); fs_reg neg_result(result); neg_result.negate = true; inst = emit(ADD(result, neg_result, fs_reg(31))); inst->predicate = BRW_PREDICATE_NORMAL; break; } case nir_op_find_lsb: emit(FBL(result, op[0])); break; case nir_op_ubitfield_extract: case nir_op_ibitfield_extract: emit(BFE(result, op[2], op[1], op[0])); break; case nir_op_bfm: emit(BFI1(result, op[0], op[1])); break; case nir_op_bfi: emit(BFI2(result, op[0], op[1], op[2])); break; case nir_op_bitfield_insert: unreachable("not reached: should be handled by " "lower_instructions::bitfield_insert_to_bfm_bfi"); case nir_op_ishl: emit(SHL(result, op[0], op[1])); break; case nir_op_ishr: emit(ASR(result, op[0], op[1])); break; case nir_op_ushr: emit(SHR(result, op[0], op[1])); break; case nir_op_pack_half_2x16_split: emit(FS_OPCODE_PACK_HALF_2x16_SPLIT, result, op[0], op[1]); break; case nir_op_ffma: inst = emit(MAD(result, op[2], op[1], op[0])); inst->saturate = instr->dest.saturate; break; case nir_op_flrp: inst = emit_lrp(result, op[0], op[1], op[2]); inst->saturate = instr->dest.saturate; break; case nir_op_bcsel: if (optimize_frontfacing_ternary(instr, result)) return; emit(CMP(reg_null_d, op[0], fs_reg(0), BRW_CONDITIONAL_NZ)); inst = emit(SEL(result, op[1], op[2])); inst->predicate = BRW_PREDICATE_NORMAL; break; default: unreachable("unhandled instruction"); } /* If we need to do a boolean resolve, replace the result with -(x & 1) * to sign extend the low bit to 0/~0 */ if (devinfo->gen <= 5 && (instr->instr.pass_flags & BRW_NIR_BOOLEAN_MASK) == BRW_NIR_BOOLEAN_NEEDS_RESOLVE) { fs_reg masked = vgrf(glsl_type::int_type); emit(AND(masked, result, fs_reg(1))); masked.negate = true; emit(MOV(retype(result, BRW_REGISTER_TYPE_D), masked)); } } static fs_reg fs_reg_for_nir_reg(fs_visitor *v, nir_register *nir_reg, unsigned base_offset, nir_src *indirect) { fs_reg reg; if (nir_reg->is_global) reg = v->nir_globals[nir_reg->index]; else reg = v->nir_locals[nir_reg->index]; reg = offset(reg, base_offset * nir_reg->num_components); if (indirect) { int multiplier = nir_reg->num_components * (v->dispatch_width / 8); reg.reladdr = new(v->mem_ctx) fs_reg(v->vgrf(glsl_type::int_type)); v->emit(v->MUL(*reg.reladdr, v->get_nir_src(*indirect), fs_reg(multiplier))); } return reg; } fs_reg fs_visitor::get_nir_src(nir_src src) { if (src.is_ssa) { assert(src.ssa->parent_instr->type == nir_instr_type_load_const); nir_load_const_instr *load = nir_instr_as_load_const(src.ssa->parent_instr); fs_reg reg = vgrf(src.ssa->num_components); reg.type = BRW_REGISTER_TYPE_D; for (unsigned i = 0; i < src.ssa->num_components; ++i) emit(MOV(offset(reg, i), fs_reg(load->value.i[i]))); return reg; } else { fs_reg reg = fs_reg_for_nir_reg(this, src.reg.reg, src.reg.base_offset, src.reg.indirect); /* to avoid floating-point denorm flushing problems, set the type by * default to D - instructions that need floating point semantics will set * this to F if they need to */ return retype(reg, BRW_REGISTER_TYPE_D); } } fs_reg fs_visitor::get_nir_dest(nir_dest dest) { return fs_reg_for_nir_reg(this, dest.reg.reg, dest.reg.base_offset, dest.reg.indirect); } void fs_visitor::emit_percomp(fs_inst *inst, unsigned wr_mask) { for (unsigned i = 0; i < 4; i++) { if (!((wr_mask >> i) & 1)) continue; fs_inst *new_inst = new(mem_ctx) fs_inst(*inst); new_inst->dst = offset(new_inst->dst, i); for (unsigned j = 0; j < new_inst->sources; j++) if (inst->src[j].file == GRF) new_inst->src[j] = offset(new_inst->src[j], i); emit(new_inst); } } void fs_visitor::nir_emit_intrinsic(nir_intrinsic_instr *instr) { fs_reg dest; if (nir_intrinsic_infos[instr->intrinsic].has_dest) dest = get_nir_dest(instr->dest); bool has_indirect = false; switch (instr->intrinsic) { case nir_intrinsic_discard: case nir_intrinsic_discard_if: { /* We track our discarded pixels in f0.1. By predicating on it, we can * update just the flag bits that aren't yet discarded. If there's no * condition, we emit a CMP of g0 != g0, so all currently executing * channels will get turned off. */ fs_inst *cmp; if (instr->intrinsic == nir_intrinsic_discard_if) { cmp = emit(CMP(reg_null_f, get_nir_src(instr->src[0]), fs_reg(0), BRW_CONDITIONAL_Z)); } else { fs_reg some_reg = fs_reg(retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW)); cmp = emit(CMP(reg_null_f, some_reg, some_reg, BRW_CONDITIONAL_NZ)); } cmp->predicate = BRW_PREDICATE_NORMAL; cmp->flag_subreg = 1; if (devinfo->gen >= 6) { emit_discard_jump(); } break; } case nir_intrinsic_atomic_counter_inc: case nir_intrinsic_atomic_counter_dec: case nir_intrinsic_atomic_counter_read: { unsigned surf_index = prog_data->binding_table.abo_start + (unsigned) instr->const_index[0]; fs_reg offset = fs_reg(get_nir_src(instr->src[0])); switch (instr->intrinsic) { case nir_intrinsic_atomic_counter_inc: emit_untyped_atomic(BRW_AOP_INC, surf_index, dest, offset, fs_reg(), fs_reg()); break; case nir_intrinsic_atomic_counter_dec: emit_untyped_atomic(BRW_AOP_PREDEC, surf_index, dest, offset, fs_reg(), fs_reg()); break; case nir_intrinsic_atomic_counter_read: emit_untyped_surface_read(surf_index, dest, offset); break; default: unreachable("Unreachable"); } break; } case nir_intrinsic_load_front_face: emit(MOV(retype(dest, BRW_REGISTER_TYPE_D), *emit_frontfacing_interpolation())); break; case nir_intrinsic_load_vertex_id: unreachable("should be lowered by lower_vertex_id()"); case nir_intrinsic_load_vertex_id_zero_base: { fs_reg vertex_id = nir_system_values[SYSTEM_VALUE_VERTEX_ID_ZERO_BASE]; assert(vertex_id.file != BAD_FILE); dest.type = vertex_id.type; emit(MOV(dest, vertex_id)); break; } case nir_intrinsic_load_base_vertex: { fs_reg base_vertex = nir_system_values[SYSTEM_VALUE_BASE_VERTEX]; assert(base_vertex.file != BAD_FILE); dest.type = base_vertex.type; emit(MOV(dest, base_vertex)); break; } case nir_intrinsic_load_instance_id: { fs_reg instance_id = nir_system_values[SYSTEM_VALUE_INSTANCE_ID]; assert(instance_id.file != BAD_FILE); dest.type = instance_id.type; emit(MOV(dest, instance_id)); break; } case nir_intrinsic_load_sample_mask_in: { fs_reg sample_mask_in = nir_system_values[SYSTEM_VALUE_SAMPLE_MASK_IN]; assert(sample_mask_in.file != BAD_FILE); dest.type = sample_mask_in.type; emit(MOV(dest, sample_mask_in)); break; } case nir_intrinsic_load_sample_pos: { fs_reg sample_pos = nir_system_values[SYSTEM_VALUE_SAMPLE_POS]; assert(sample_pos.file != BAD_FILE); dest.type = sample_pos.type; emit(MOV(dest, sample_pos)); emit(MOV(offset(dest, 1), offset(sample_pos, 1))); break; } case nir_intrinsic_load_sample_id: { fs_reg sample_id = nir_system_values[SYSTEM_VALUE_SAMPLE_ID]; assert(sample_id.file != BAD_FILE); dest.type = sample_id.type; emit(MOV(dest, sample_id)); break; } case nir_intrinsic_load_uniform_indirect: has_indirect = true; /* fallthrough */ case nir_intrinsic_load_uniform: { unsigned index = instr->const_index[0]; fs_reg uniform_reg; if (index < num_direct_uniforms) { uniform_reg = fs_reg(UNIFORM, 0); } else { uniform_reg = fs_reg(UNIFORM, num_direct_uniforms); index -= num_direct_uniforms; } for (int i = 0; i < instr->const_index[1]; i++) { for (unsigned j = 0; j < instr->num_components; j++) { fs_reg src = offset(retype(uniform_reg, dest.type), index); if (has_indirect) src.reladdr = new(mem_ctx) fs_reg(get_nir_src(instr->src[0])); index++; emit(MOV(dest, src)); dest = offset(dest, 1); } } break; } case nir_intrinsic_load_ubo_indirect: has_indirect = true; /* fallthrough */ case nir_intrinsic_load_ubo: { nir_const_value *const_index = nir_src_as_const_value(instr->src[0]); fs_reg surf_index; if (const_index) { surf_index = fs_reg(stage_prog_data->binding_table.ubo_start + const_index->u[0]); } else { /* The block index is not a constant. Evaluate the index expression * per-channel and add the base UBO index; the generator will select * a value from any live channel. */ surf_index = vgrf(glsl_type::uint_type); emit(ADD(surf_index, get_nir_src(instr->src[0]), fs_reg(stage_prog_data->binding_table.ubo_start))) ->force_writemask_all = true; /* Assume this may touch any UBO. It would be nice to provide * a tighter bound, but the array information is already lowered away. */ brw_mark_surface_used(prog_data, stage_prog_data->binding_table.ubo_start + shader_prog->NumUniformBlocks - 1); } if (has_indirect) { /* Turn the byte offset into a dword offset. */ fs_reg base_offset = vgrf(glsl_type::int_type); emit(SHR(base_offset, retype(get_nir_src(instr->src[1]), BRW_REGISTER_TYPE_D), fs_reg(2))); unsigned vec4_offset = instr->const_index[0] / 4; for (int i = 0; i < instr->num_components; i++) emit(VARYING_PULL_CONSTANT_LOAD(offset(dest, i), surf_index, base_offset, vec4_offset + i)); } else { fs_reg packed_consts = vgrf(glsl_type::float_type); packed_consts.type = dest.type; fs_reg const_offset_reg((unsigned) instr->const_index[0] & ~15); emit(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD, packed_consts, surf_index, const_offset_reg); for (unsigned i = 0; i < instr->num_components; i++) { packed_consts.set_smear(instr->const_index[0] % 16 / 4 + i); /* The std140 packing rules don't allow vectors to cross 16-byte * boundaries, and a reg is 32 bytes. */ assert(packed_consts.subreg_offset < 32); emit(MOV(dest, packed_consts)); dest = offset(dest, 1); } } break; } case nir_intrinsic_load_input_indirect: has_indirect = true; /* fallthrough */ case nir_intrinsic_load_input: { unsigned index = 0; for (int i = 0; i < instr->const_index[1]; i++) { for (unsigned j = 0; j < instr->num_components; j++) { fs_reg src = offset(retype(nir_inputs, dest.type), instr->const_index[0] + index); if (has_indirect) src.reladdr = new(mem_ctx) fs_reg(get_nir_src(instr->src[0])); index++; emit(MOV(dest, src)); dest = offset(dest, 1); } } break; } /* Handle ARB_gpu_shader5 interpolation intrinsics * * It's worth a quick word of explanation as to why we handle the full * variable-based interpolation intrinsic rather than a lowered version * with like we do for other inputs. We have to do that because the way * we set up inputs doesn't allow us to use the already setup inputs for * interpolation. At the beginning of the shader, we go through all of * the input variables and do the initial interpolation and put it in * the nir_inputs array based on its location as determined in * nir_lower_io. If the input isn't used, dead code cleans up and * everything works fine. However, when we get to the ARB_gpu_shader5 * interpolation intrinsics, we need to reinterpolate the input * differently. If we used an intrinsic that just had an index it would * only give us the offset into the nir_inputs array. However, this is * useless because that value is post-interpolation and we need * pre-interpolation. In order to get the actual location of the bits * we get from the vertex fetching hardware, we need the variable. */ case nir_intrinsic_interp_var_at_centroid: case nir_intrinsic_interp_var_at_sample: case nir_intrinsic_interp_var_at_offset: { /* in SIMD16 mode, the pixel interpolator returns coords interleaved * 8 channels at a time, same as the barycentric coords presented in * the FS payload. this requires a bit of extra work to support. */ no16("interpolate_at_* not yet supported in SIMD16 mode."); fs_reg dst_xy = vgrf(2); /* For most messages, we need one reg of ignored data; the hardware * requires mlen==1 even when there is no payload. in the per-slot * offset case, we'll replace this with the proper source data. */ fs_reg src = vgrf(glsl_type::float_type); int mlen = 1; /* one reg unless overriden */ fs_inst *inst; switch (instr->intrinsic) { case nir_intrinsic_interp_var_at_centroid: inst = emit(FS_OPCODE_INTERPOLATE_AT_CENTROID, dst_xy, src, fs_reg(0u)); break; case nir_intrinsic_interp_var_at_sample: { /* XXX: We should probably handle non-constant sample id's */ nir_const_value *const_sample = nir_src_as_const_value(instr->src[0]); assert(const_sample); unsigned msg_data = const_sample ? const_sample->i[0] << 4 : 0; inst = emit(FS_OPCODE_INTERPOLATE_AT_SAMPLE, dst_xy, src, fs_reg(msg_data)); break; } case nir_intrinsic_interp_var_at_offset: { nir_const_value *const_offset = nir_src_as_const_value(instr->src[0]); if (const_offset) { unsigned off_x = MIN2((int)(const_offset->f[0] * 16), 7) & 0xf; unsigned off_y = MIN2((int)(const_offset->f[1] * 16), 7) & 0xf; inst = emit(FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET, dst_xy, src, fs_reg(off_x | (off_y << 4))); } else { src = vgrf(glsl_type::ivec2_type); fs_reg offset_src = retype(get_nir_src(instr->src[0]), BRW_REGISTER_TYPE_F); for (int i = 0; i < 2; i++) { fs_reg temp = vgrf(glsl_type::float_type); emit(MUL(temp, offset(offset_src, i), fs_reg(16.0f))); fs_reg itemp = vgrf(glsl_type::int_type); emit(MOV(itemp, temp)); /* float to int */ /* Clamp the upper end of the range to +7/16. * ARB_gpu_shader5 requires that we support a maximum offset * of +0.5, which isn't representable in a S0.4 value -- if * we didn't clamp it, we'd end up with -8/16, which is the * opposite of what the shader author wanted. * * This is legal due to ARB_gpu_shader5's quantization * rules: * * "Not all values of may be supported; x and y * offsets may be rounded to fixed-point values with the * number of fraction bits given by the * implementation-dependent constant * FRAGMENT_INTERPOLATION_OFFSET_BITS" */ emit(BRW_OPCODE_SEL, offset(src, i), itemp, fs_reg(7)) ->conditional_mod = BRW_CONDITIONAL_L; /* min(src2, 7) */ } mlen = 2; inst = emit(FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET, dst_xy, src, fs_reg(0u)); } break; } default: unreachable("Invalid intrinsic"); } inst->mlen = mlen; inst->regs_written = 2; /* 2 floats per slot returned */ inst->pi_noperspective = instr->variables[0]->var->data.interpolation == INTERP_QUALIFIER_NOPERSPECTIVE; for (unsigned j = 0; j < instr->num_components; j++) { fs_reg src = interp_reg(instr->variables[0]->var->data.location, j); src.type = dest.type; emit(FS_OPCODE_LINTERP, dest, dst_xy, src); dest = offset(dest, 1); } break; } case nir_intrinsic_store_output_indirect: has_indirect = true; /* fallthrough */ case nir_intrinsic_store_output: { fs_reg src = get_nir_src(instr->src[0]); unsigned index = 0; for (int i = 0; i < instr->const_index[1]; i++) { for (unsigned j = 0; j < instr->num_components; j++) { fs_reg new_dest = offset(retype(nir_outputs, src.type), instr->const_index[0] + index); if (has_indirect) src.reladdr = new(mem_ctx) fs_reg(get_nir_src(instr->src[1])); index++; emit(MOV(new_dest, src)); src = offset(src, 1); } } break; } default: unreachable("unknown intrinsic"); } } void fs_visitor::nir_emit_texture(nir_tex_instr *instr) { unsigned sampler = instr->sampler_index; fs_reg sampler_reg(sampler); /* FINISHME: We're failing to recompile our programs when the sampler is * updated. This only matters for the texture rectangle scale parameters * (pre-gen6, or gen6+ with GL_CLAMP). */ int texunit = prog->SamplerUnits[sampler]; int gather_component = instr->component; bool is_rect = instr->sampler_dim == GLSL_SAMPLER_DIM_RECT; bool is_cube_array = instr->sampler_dim == GLSL_SAMPLER_DIM_CUBE && instr->is_array; int lod_components = 0, offset_components = 0; fs_reg coordinate, shadow_comparitor, lod, lod2, sample_index, mcs, tex_offset; for (unsigned i = 0; i < instr->num_srcs; i++) { fs_reg src = get_nir_src(instr->src[i].src); switch (instr->src[i].src_type) { case nir_tex_src_bias: lod = retype(src, BRW_REGISTER_TYPE_F); break; case nir_tex_src_comparitor: shadow_comparitor = retype(src, BRW_REGISTER_TYPE_F); break; case nir_tex_src_coord: switch (instr->op) { case nir_texop_txf: case nir_texop_txf_ms: coordinate = retype(src, BRW_REGISTER_TYPE_D); break; default: coordinate = retype(src, BRW_REGISTER_TYPE_F); break; } break; case nir_tex_src_ddx: lod = retype(src, BRW_REGISTER_TYPE_F); lod_components = nir_tex_instr_src_size(instr, i); break; case nir_tex_src_ddy: lod2 = retype(src, BRW_REGISTER_TYPE_F); break; case nir_tex_src_lod: switch (instr->op) { case nir_texop_txs: lod = retype(src, BRW_REGISTER_TYPE_UD); break; case nir_texop_txf: lod = retype(src, BRW_REGISTER_TYPE_D); break; default: lod = retype(src, BRW_REGISTER_TYPE_F); break; } break; case nir_tex_src_ms_index: sample_index = retype(src, BRW_REGISTER_TYPE_UD); break; case nir_tex_src_offset: tex_offset = retype(src, BRW_REGISTER_TYPE_D); if (instr->is_array) offset_components = instr->coord_components - 1; else offset_components = instr->coord_components; break; case nir_tex_src_projector: unreachable("should be lowered"); case nir_tex_src_sampler_offset: { /* Figure out the highest possible sampler index and mark it as used */ uint32_t max_used = sampler + instr->sampler_array_size - 1; if (instr->op == nir_texop_tg4 && devinfo->gen < 8) { max_used += stage_prog_data->binding_table.gather_texture_start; } else { max_used += stage_prog_data->binding_table.texture_start; } brw_mark_surface_used(prog_data, max_used); /* Emit code to evaluate the actual indexing expression */ sampler_reg = vgrf(glsl_type::uint_type); emit(ADD(sampler_reg, src, fs_reg(sampler))) ->force_writemask_all = true; break; } default: unreachable("unknown texture source"); } } if (instr->op == nir_texop_txf_ms) { if (devinfo->gen >= 7 && key_tex->compressed_multisample_layout_mask & (1 << sampler)) { mcs = emit_mcs_fetch(coordinate, instr->coord_components, sampler_reg); } else { mcs = fs_reg(0u); } } for (unsigned i = 0; i < 3; i++) { if (instr->const_offset[i] != 0) { assert(offset_components == 0); tex_offset = fs_reg(brw_texture_offset(instr->const_offset, 3)); break; } } enum glsl_base_type dest_base_type; switch (instr->dest_type) { case nir_type_float: dest_base_type = GLSL_TYPE_FLOAT; break; case nir_type_int: dest_base_type = GLSL_TYPE_INT; break; case nir_type_unsigned: dest_base_type = GLSL_TYPE_UINT; break; default: unreachable("bad type"); } const glsl_type *dest_type = glsl_type::get_instance(dest_base_type, nir_tex_instr_dest_size(instr), 1); ir_texture_opcode op; switch (instr->op) { case nir_texop_lod: op = ir_lod; break; case nir_texop_query_levels: op = ir_query_levels; break; case nir_texop_tex: op = ir_tex; break; case nir_texop_tg4: op = ir_tg4; break; case nir_texop_txb: op = ir_txb; break; case nir_texop_txd: op = ir_txd; break; case nir_texop_txf: op = ir_txf; break; case nir_texop_txf_ms: op = ir_txf_ms; break; case nir_texop_txl: op = ir_txl; break; case nir_texop_txs: op = ir_txs; break; default: unreachable("unknown texture opcode"); } emit_texture(op, dest_type, coordinate, instr->coord_components, shadow_comparitor, lod, lod2, lod_components, sample_index, tex_offset, mcs, gather_component, is_cube_array, is_rect, sampler, sampler_reg, texunit); fs_reg dest = get_nir_dest(instr->dest); dest.type = this->result.type; unsigned num_components = nir_tex_instr_dest_size(instr); emit_percomp(MOV(dest, this->result), (1 << num_components) - 1); } void fs_visitor::nir_emit_jump(nir_jump_instr *instr) { switch (instr->type) { case nir_jump_break: emit(BRW_OPCODE_BREAK); break; case nir_jump_continue: emit(BRW_OPCODE_CONTINUE); break; case nir_jump_return: default: unreachable("unknown jump"); } }