59 lines
2.4 KiB
C
59 lines
2.4 KiB
C
/*
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* Copyright (C) 2021 Collabora, Ltd.
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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 "pan_ir.h"
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#include "compiler/nir/nir_builder.h"
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/* Lower gl_HelperInvocation to (gl_SampleMaskIn == 0), this depends on
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* architectural details but is required for correct operation with
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* multisampling. NIR's lowering won't work for us, since there is no in-spec
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* way to implement load_sample_id_no_per_sample. */
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static bool
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pan_lower_helper_invocation_instr(nir_builder *b, nir_instr *instr, void *data)
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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 *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic != nir_intrinsic_load_helper_invocation)
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return false;
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b->cursor = nir_before_instr(instr);
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nir_ssa_def *mask = nir_load_sample_mask_in(b);
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nir_ssa_def *eq = nir_ieq(b, mask, nir_imm_int(b, 0));
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nir_ssa_def_rewrite_uses(&intr->dest.ssa, eq);
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return true;
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}
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bool
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pan_lower_helper_invocation(nir_shader *shader)
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{
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return nir_shader_instructions_pass(shader,
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pan_lower_helper_invocation_instr,
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nir_metadata_block_index | nir_metadata_dominance,
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NULL);
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}
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