From 5c82f8a097f2824de650e6cae16d4ce73b1cb512 Mon Sep 17 00:00:00 2001 From: Alyssa Rosenzweig Date: Wed, 13 May 2020 11:50:18 -0400 Subject: [PATCH] panfrost: Add theory for new framebuffer lowering We take a somewhat different strategy that should be more flexible. Signed-off-by: Alyssa Rosenzweig Part-of: --- src/panfrost/Makefile.sources | 1 + src/panfrost/util/meson.build | 1 + src/panfrost/util/pan_lower_framebuffer.c | 53 +++++++++++++++++++++++ 3 files changed, 55 insertions(+) create mode 100644 src/panfrost/util/pan_lower_framebuffer.c diff --git a/src/panfrost/Makefile.sources b/src/panfrost/Makefile.sources index 865812e82a9..945c8f4e042 100644 --- a/src/panfrost/Makefile.sources +++ b/src/panfrost/Makefile.sources @@ -87,4 +87,5 @@ util_FILES := \ util/pan_ir.c \ util/pan_ir.h \ util/pan_liveness.c \ + util/pan_lower_framebuffer.c \ util/pan_sysval.c \ diff --git a/src/panfrost/util/meson.build b/src/panfrost/util/meson.build index aa3b5decbc8..04271a6bb02 100644 --- a/src/panfrost/util/meson.build +++ b/src/panfrost/util/meson.build @@ -26,6 +26,7 @@ libpanfrost_util_files = files( 'pan_ir.c', 'pan_ir.h', 'pan_liveness.c', + 'pan_lower_framebuffer.c', 'pan_sysval.c', ) diff --git a/src/panfrost/util/pan_lower_framebuffer.c b/src/panfrost/util/pan_lower_framebuffer.c new file mode 100644 index 00000000000..1df763c20dd --- /dev/null +++ b/src/panfrost/util/pan_lower_framebuffer.c @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2020 Collabora, Ltd. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors (Collabora): + * Alyssa Rosenzweig + */ + +/** + * Implements framebuffer format conversions in software for Midgard/Bifrost + * blend shaders. This pass is designed for a single render target; Midgard + * duplicates blend shaders for MRT to simplify everything. A particular + * framebuffer format may be categorized as 1) typed load available, 2) typed + * unpack available, or 3) software unpack only, and likewise for stores. The + * first two types are handled in the compiler backend directly, so this module + * is responsible for identifying type 3 formats (hardware dependent) and + * inserting appropriate ALU code to perform the conversion from the packed + * type to a designated unpacked type, and vice versa. + * + * The unpacked type depends on the format: + * + * - For 32-bit float formats, 32-bit floats. + * - For other floats, 16-bit floats. + * - For 32-bit ints, 32-bit ints. + * - For 8-bit ints, 8-bit ints. + * - For other ints, 16-bit ints. + * + * The rationale is to optimize blending and logic op instructions by using the + * smallest precision necessary to store the pixel losslessly. + */ + +#include "compiler/nir/nir.h" +#include "compiler/nir/nir_builder.h" +#include "compiler/nir/nir_format_convert.h" +#include "util/format/u_format.h" -- 2.30.2