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60d647f9de
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5265>
86 lines
3.6 KiB
C
86 lines
3.6 KiB
C
/*
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* Copyright (C) 2020 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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors (Collabora):
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* Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
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*/
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/**
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* Implements framebuffer format conversions in software for Midgard/Bifrost
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* blend shaders. This pass is designed for a single render target; Midgard
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* duplicates blend shaders for MRT to simplify everything. A particular
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* framebuffer format may be categorized as 1) typed load available, 2) typed
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* unpack available, or 3) software unpack only, and likewise for stores. The
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* first two types are handled in the compiler backend directly, so this module
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* is responsible for identifying type 3 formats (hardware dependent) and
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* inserting appropriate ALU code to perform the conversion from the packed
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* type to a designated unpacked type, and vice versa.
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*
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* The unpacked type depends on the format:
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*
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* - For 32-bit float formats, 32-bit floats.
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* - For other floats, 16-bit floats.
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* - For 32-bit ints, 32-bit ints.
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* - For 8-bit ints, 8-bit ints.
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* - For other ints, 16-bit ints.
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*
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* The rationale is to optimize blending and logic op instructions by using the
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* smallest precision necessary to store the pixel losslessly.
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*/
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#include "compiler/nir/nir.h"
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#include "compiler/nir/nir_builder.h"
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#include "compiler/nir/nir_format_convert.h"
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#include "util/format/u_format.h"
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#include "pan_lower_framebuffer.h"
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/* Determines the unpacked type best suiting a given format, so the rest of the
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* pipeline may be adjusted accordingly */
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nir_alu_type
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pan_unpacked_type_for_format(const struct util_format_description *desc)
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{
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int c = util_format_get_first_non_void_channel(desc->format);
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if (c == -1)
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unreachable("Void format not renderable");
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bool large = (desc->channel[c].size > 16);
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bool bit8 = (desc->channel[c].size == 8);
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assert(desc->channel[c].size <= 32);
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if (desc->channel[c].normalized)
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return large ? nir_type_float32 : nir_type_float16;
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switch (desc->channel[c].type) {
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case UTIL_FORMAT_TYPE_UNSIGNED:
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return bit8 ? nir_type_uint8 :
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large ? nir_type_uint32 : nir_type_uint16;
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case UTIL_FORMAT_TYPE_SIGNED:
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return bit8 ? nir_type_int8 :
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large ? nir_type_int32 : nir_type_int16;
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case UTIL_FORMAT_TYPE_FLOAT:
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return large ? nir_type_float32 : nir_type_float16;
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default:
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unreachable("Format not renderable");
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}
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}
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