1 /* 2 * Copyright (C) 2005-2007 Brian Paul All Rights Reserved. 3 * Copyright (C) 2008 VMware, Inc. All Rights Reserved. 4 * Copyright 2014 Intel Corporation 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 * DEALINGS IN THE SOFTWARE. 24 */ 25 26 #include "nir.h" 27 #include "nir_builder.h" 28 #include "compiler/glsl/ir_uniform.h" 29 30 #include "main/compiler.h" 31 #include "main/mtypes.h" 32 #include "program/prog_parameter.h" 33 #include "program/program.h" 34 35 /* Calculate the sampler index based on array indicies and also 36 * calculate the base uniform location for struct members. 37 */ 38 static void 39 calc_sampler_offsets(nir_deref *tail, nir_tex_instr *instr, 40 unsigned *array_elements, nir_ssa_def **indirect, 41 nir_builder *b, unsigned *location) 42 { 43 if (tail->child == NULL) 44 return; 45 46 switch (tail->child->deref_type) { 47 case nir_deref_type_array: { 48 nir_deref_array *deref_array = nir_deref_as_array(tail->child); 49 50 assert(deref_array->deref_array_type != nir_deref_array_type_wildcard); 51 52 calc_sampler_offsets(tail->child, instr, array_elements, 53 indirect, b, location); 54 instr->texture_index += deref_array->base_offset * *array_elements; 55 56 if (deref_array->deref_array_type == nir_deref_array_type_indirect) { 57 nir_ssa_def *mul = 58 nir_imul(b, nir_imm_int(b, *array_elements), 59 nir_ssa_for_src(b, deref_array->indirect, 1)); 60 61 nir_instr_rewrite_src(&instr->instr, &deref_array->indirect, 62 NIR_SRC_INIT); 63 64 if (*indirect) { 65 *indirect = nir_iadd(b, *indirect, mul); 66 } else { 67 *indirect = mul; 68 } 69 } 70 71 *array_elements *= glsl_get_length(tail->type); 72 break; 73 } 74 75 case nir_deref_type_struct: { 76 nir_deref_struct *deref_struct = nir_deref_as_struct(tail->child); 77 *location += glsl_get_record_location_offset(tail->type, deref_struct->index); 78 calc_sampler_offsets(tail->child, instr, array_elements, 79 indirect, b, location); 80 break; 81 } 82 83 default: 84 unreachable("Invalid deref type"); 85 break; 86 } 87 } 88 89 static void 90 lower_sampler(nir_tex_instr *instr, const struct gl_shader_program *shader_program, 91 gl_shader_stage stage, nir_builder *b) 92 { 93 if (instr->texture == NULL) 94 return; 95 96 /* In GLSL, we only fill out the texture field. The sampler is inferred */ 97 assert(instr->sampler == NULL); 98 99 instr->texture_index = 0; 100 unsigned location = instr->texture->var->data.location; 101 unsigned array_elements = 1; 102 nir_ssa_def *indirect = NULL; 103 104 b->cursor = nir_before_instr(&instr->instr); 105 calc_sampler_offsets(&instr->texture->deref, instr, &array_elements, 106 &indirect, b, &location); 107 108 if (indirect) { 109 assert(array_elements >= 1); 110 indirect = nir_umin(b, indirect, nir_imm_int(b, array_elements - 1)); 111 112 /* First, we have to resize the array of texture sources */ 113 nir_tex_src *new_srcs = rzalloc_array(instr, nir_tex_src, 114 instr->num_srcs + 2); 115 116 for (unsigned i = 0; i < instr->num_srcs; i++) { 117 new_srcs[i].src_type = instr->src[i].src_type; 118 nir_instr_move_src(&instr->instr, &new_srcs[i].src, 119 &instr->src[i].src); 120 } 121 122 ralloc_free(instr->src); 123 instr->src = new_srcs; 124 125 /* Now we can go ahead and move the source over to being a 126 * first-class texture source. 127 */ 128 instr->src[instr->num_srcs].src_type = nir_tex_src_texture_offset; 129 instr->num_srcs++; 130 nir_instr_rewrite_src(&instr->instr, 131 &instr->src[instr->num_srcs - 1].src, 132 nir_src_for_ssa(indirect)); 133 134 instr->src[instr->num_srcs].src_type = nir_tex_src_sampler_offset; 135 instr->num_srcs++; 136 nir_instr_rewrite_src(&instr->instr, 137 &instr->src[instr->num_srcs - 1].src, 138 nir_src_for_ssa(indirect)); 139 140 instr->texture_array_size = array_elements; 141 } 142 143 if (location > shader_program->data->NumUniformStorage - 1 || 144 !shader_program->data->UniformStorage[location].opaque[stage].active) { 145 assert(!"cannot return a sampler"); 146 return; 147 } 148 149 instr->texture_index += 150 shader_program->data->UniformStorage[location].opaque[stage].index; 151 152 instr->sampler_index = instr->texture_index; 153 154 instr->texture = NULL; 155 } 156 157 static void 158 lower_impl(nir_function_impl *impl, const struct gl_shader_program *shader_program, 159 gl_shader_stage stage) 160 { 161 nir_builder b; 162 nir_builder_init(&b, impl); 163 164 nir_foreach_block(block, impl) { 165 nir_foreach_instr(instr, block) { 166 if (instr->type == nir_instr_type_tex) 167 lower_sampler(nir_instr_as_tex(instr), shader_program, stage, &b); 168 } 169 } 170 } 171 172 void 173 nir_lower_samplers(nir_shader *shader, 174 const struct gl_shader_program *shader_program) 175 { 176 nir_foreach_function(function, shader) { 177 if (function->impl) 178 lower_impl(function->impl, shader_program, shader->stage); 179 } 180 } 181
