168 lines
6.2 KiB
C
168 lines
6.2 KiB
C
/*
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* Copyright © Microsoft Corporation
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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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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "dxil_nir.h"
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#include "nir_builder.h"
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#include "nir_builtin_builder.h"
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static enum pipe_format
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get_input_target_format(nir_variable *var, const void *options)
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{
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enum pipe_format *target_formats = (enum pipe_format *)options;
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return target_formats[var->data.driver_location];
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}
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static bool
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lower_vs_vertex_conversion_filter(const nir_instr *instr, const void *options)
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{
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if (instr->type != nir_instr_type_intrinsic)
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return false;
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nir_intrinsic_instr *inst = nir_instr_as_intrinsic(instr);
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if (inst->intrinsic != nir_intrinsic_load_deref)
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return false;
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nir_variable *var = nir_intrinsic_get_var(inst, 0);
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return (var->data.mode == nir_var_shader_in) &&
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(get_input_target_format(var, options) != PIPE_FORMAT_NONE);
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}
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typedef nir_ssa_def *
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(*shift_right_func)(nir_builder *build, nir_ssa_def *src0, nir_ssa_def *src1);
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/* decoding the signed vs unsigned scaled format is handled
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* by applying the signed or unsigned shift right function
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* accordingly */
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static nir_ssa_def *
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from_10_10_10_2_scaled(nir_builder *b, nir_ssa_def *src,
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nir_ssa_def *lshift, shift_right_func shr)
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{
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nir_ssa_def *rshift = nir_imm_ivec4(b, 22, 22, 22, 30);
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return nir_i2f32(b, shr(b, nir_ishl(b, src, lshift), rshift));
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}
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static nir_ssa_def *
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from_10_10_10_2_snorm(nir_builder *b, nir_ssa_def *src, nir_ssa_def *lshift)
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{
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nir_ssa_def *split = from_10_10_10_2_scaled(b, src, lshift, nir_ishr);
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nir_ssa_def *scale_rgb = nir_imm_vec4(b,
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1.0f / 0x1ff,
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1.0f / 0x1ff,
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1.0f / 0x1ff,
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1.0f);
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return nir_fmul(b, split, scale_rgb);
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}
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static nir_ssa_def *
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from_10_10_10_2_unorm(nir_builder *b, nir_ssa_def *src, nir_ssa_def *lshift)
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{
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nir_ssa_def *split = from_10_10_10_2_scaled(b, src, lshift, nir_ushr);
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nir_ssa_def *scale_rgb = nir_imm_vec4(b,
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1.0f / 0x3ff,
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1.0f / 0x3ff,
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1.0f / 0x3ff,
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1.0f / 3.0f);
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return nir_fmul(b, split, scale_rgb);
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}
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inline static nir_ssa_def *
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lshift_rgba(nir_builder *b)
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{
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return nir_imm_ivec4(b, 22, 12, 2, 0);
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}
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inline static nir_ssa_def *
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lshift_bgra(nir_builder *b)
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{
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return nir_imm_ivec4(b, 2, 12, 22, 0);
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}
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static nir_ssa_def *
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lower_vs_vertex_conversion_impl(nir_builder *b, nir_instr *instr, void *options)
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{
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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nir_variable *var = nir_intrinsic_get_var(intr, 0);
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enum pipe_format fmt = get_input_target_format(var, options);
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if (!util_format_has_alpha(fmt)) {
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/* these formats need the alpha channel replaced with 1: */
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assert(fmt == PIPE_FORMAT_R8G8B8_SINT ||
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fmt == PIPE_FORMAT_R8G8B8_UINT ||
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fmt == PIPE_FORMAT_R16G16B16_SINT ||
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fmt == PIPE_FORMAT_R16G16B16_UINT);
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if (intr->dest.ssa.num_components == 3)
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return NULL;
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return nir_vector_insert_imm(b, &intr->dest.ssa, nir_imm_int(b, 1), 3);
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} else {
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nir_ssa_def *src = nir_channel(b, &intr->dest.ssa, 0);
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switch (fmt) {
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case PIPE_FORMAT_R10G10B10A2_SNORM:
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return from_10_10_10_2_snorm(b, src, lshift_rgba(b));
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case PIPE_FORMAT_B10G10R10A2_SNORM:
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return from_10_10_10_2_snorm(b, src, lshift_bgra(b));
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case PIPE_FORMAT_B10G10R10A2_UNORM:
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return from_10_10_10_2_unorm(b, src, lshift_bgra(b));
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case PIPE_FORMAT_R10G10B10A2_SSCALED:
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return from_10_10_10_2_scaled(b, src, lshift_rgba(b), nir_ishr);
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case PIPE_FORMAT_B10G10R10A2_SSCALED:
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return from_10_10_10_2_scaled(b, src, lshift_bgra(b), nir_ishr);
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case PIPE_FORMAT_R10G10B10A2_USCALED:
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return from_10_10_10_2_scaled(b, src, lshift_rgba(b), nir_ushr);
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case PIPE_FORMAT_B10G10R10A2_USCALED:
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return from_10_10_10_2_scaled(b, src, lshift_bgra(b), nir_ushr);
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case PIPE_FORMAT_R8G8B8A8_USCALED:
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case PIPE_FORMAT_R16G16B16A16_USCALED:
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return nir_u2f32(b, &intr->dest.ssa);
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case PIPE_FORMAT_R8G8B8A8_SSCALED:
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case PIPE_FORMAT_R16G16B16A16_SSCALED:
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return nir_i2f32(b, &intr->dest.ssa);
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default:
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unreachable("Unsupported emulated vertex format");
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}
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}
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}
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/* Lower emulated vertex attribute input
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* The vertex attributes are passed as R32_UINT that needs to be converted
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* to one of the RGB10A2 formats that need to be emulated.
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*
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* @param target_formats contains the per attribute format to convert to
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* or PIPE_FORMAT_NONE if no conversion is needed
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*/
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bool
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dxil_nir_lower_vs_vertex_conversion(nir_shader *s,
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enum pipe_format target_formats[])
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{
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assert(s->info.stage == MESA_SHADER_VERTEX);
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bool result =
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nir_shader_lower_instructions(s,
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lower_vs_vertex_conversion_filter,
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lower_vs_vertex_conversion_impl,
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target_formats);
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return result;
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}
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