2020-04-24 00:10:43 +01:00
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/*
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* Copyright (C) 2020 Google, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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2020-05-11 04:04:23 +01:00
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/* Lower mediump outputs to float16, int16, or uint16. */
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2020-04-24 00:10:43 +01:00
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void
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nir_lower_mediump_outputs(nir_shader *nir)
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{
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nir_function_impl *impl = nir_shader_get_entrypoint(nir);
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assert(impl);
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/* Get rid of old derefs before we change the types of the variables */
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nir_opt_dce(nir);
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nir_builder b;
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nir_builder_init(&b, impl);
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nir_foreach_block_safe (block, impl) {
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nir_foreach_instr_safe (instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic != nir_intrinsic_store_output)
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continue;
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2020-05-11 04:04:23 +01:00
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nir_foreach_variable (var, &nir->outputs) {
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if (var->data.driver_location != nir_intrinsic_base(intr))
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continue; /* not found yet */
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if (var->data.precision != GLSL_PRECISION_MEDIUM &&
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var->data.precision != GLSL_PRECISION_LOW)
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break; /* can't lower */
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switch (glsl_get_base_type(var->type)) {
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case GLSL_TYPE_FLOAT:
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var->type = glsl_float16_type(var->type);
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b.cursor = nir_before_instr(&intr->instr);
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nir_instr_rewrite_src(&intr->instr, &intr->src[0],
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nir_src_for_ssa(nir_f2f16(&b, intr->src[0].ssa)));
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nir_intrinsic_set_type(intr, nir_type_float16);
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break;
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case GLSL_TYPE_INT:
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var->type = glsl_int16_type(var->type);
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b.cursor = nir_before_instr(&intr->instr);
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nir_instr_rewrite_src(&intr->instr, &intr->src[0],
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nir_src_for_ssa(nir_i2i16(&b, intr->src[0].ssa)));
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nir_intrinsic_set_type(intr, nir_type_int16);
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break;
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2020-04-24 00:10:43 +01:00
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2020-05-11 04:04:23 +01:00
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case GLSL_TYPE_UINT:
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var->type = glsl_uint16_type(var->type);
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b.cursor = nir_before_instr(&intr->instr);
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nir_instr_rewrite_src(&intr->instr, &intr->src[0],
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nir_src_for_ssa(nir_u2u16(&b, intr->src[0].ssa)));
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nir_intrinsic_set_type(intr, nir_type_uint16);
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break;
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2020-04-24 00:10:43 +01:00
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2020-05-11 04:04:23 +01:00
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default:;
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}
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break;
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}
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2020-04-24 00:10:43 +01:00
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}
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}
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}
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