mirror of https://gitlab.freedesktop.org/mesa/mesa
190 lines
7.2 KiB
C
190 lines
7.2 KiB
C
/*
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* Copyright (C) 2019 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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* Authors:
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* Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
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*/
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#include "pan_texture.h"
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/* Arm FrameBuffer Compression (AFBC) is a lossless compression scheme natively
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* implemented in Mali GPUs (as well as many display controllers paired with
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* Mali GPUs, etc). Where possible, Panfrost prefers to use AFBC for both
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* rendering and texturing. In most cases, this is a performance-win due to a
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* dramatic reduction in memory bandwidth and cache locality compared to a
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* linear resources.
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*
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* AFBC divides the framebuffer into 16x16 tiles (other sizes possible, TODO:
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* do we need to support this?). So, the width and height each must be aligned
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* up to 16 pixels. This is inherently good for performance; note that for a 4
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* byte-per-pixel format like RGBA8888, that means that rows are 16*4=64 byte
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* aligned, which is the cache-line size.
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*
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* For each AFBC-compressed resource, there is a single contiguous
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* (CPU/GPU-shared) buffer. This buffer itself is divided into two parts:
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* header and body, placed immediately after each other.
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*
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* The AFBC header contains 16 bytes of metadata per tile.
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*
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* The AFBC body is the same size as the original linear resource (padded to
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* the nearest tile). Although the body comes immediately after the header, it
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* must also be cache-line aligned, so there can sometimes be a bit of padding
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* between the header and body.
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*
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* As an example, a 64x64 RGBA framebuffer contains 64/16 = 4 tiles horizontally
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* and 4 tiles vertically. There are 4*4=16 tiles in total, each containing 16
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* bytes of metadata, so there is a 16*16=256 byte header. 64x64 is already
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* tile aligned, so the body is 64*64 * 4 bytes per pixel = 16384 bytes of
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* body.
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*
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* From userspace, Panfrost needs to be able to calculate these sizes. It
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* explicitly does not and can not know the format of the data contained within
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* this header and body. The GPU has native support for AFBC encode/decode. For
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* an internal FBO or a framebuffer used for scanout with an AFBC-compatible
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* winsys/display-controller, the buffer is maintained AFBC throughout flight,
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* and the driver never needs to know the internal data. For edge cases where
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* the driver really does need to read/write from the AFBC resource, we
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* generate a linear staging buffer and use the GPU to blit AFBC<--->linear.
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*/
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static enum pipe_format
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unswizzled_format(enum pipe_format format)
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{
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switch (format) {
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case PIPE_FORMAT_A8_UNORM:
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case PIPE_FORMAT_L8_UNORM:
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case PIPE_FORMAT_I8_UNORM:
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return PIPE_FORMAT_R8_UNORM;
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case PIPE_FORMAT_L8A8_UNORM:
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return PIPE_FORMAT_R8G8_UNORM;
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case PIPE_FORMAT_B8G8R8_UNORM:
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return PIPE_FORMAT_R8G8B8_UNORM;
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case PIPE_FORMAT_R8G8B8X8_UNORM:
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case PIPE_FORMAT_B8G8R8A8_UNORM:
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case PIPE_FORMAT_B8G8R8X8_UNORM:
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case PIPE_FORMAT_A8R8G8B8_UNORM:
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case PIPE_FORMAT_X8R8G8B8_UNORM:
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case PIPE_FORMAT_X8B8G8R8_UNORM:
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case PIPE_FORMAT_A8B8G8R8_UNORM:
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return PIPE_FORMAT_R8G8B8A8_UNORM;
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case PIPE_FORMAT_B5G6R5_UNORM:
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return PIPE_FORMAT_R5G6B5_UNORM;
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case PIPE_FORMAT_B5G5R5A1_UNORM:
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return PIPE_FORMAT_R5G5B5A1_UNORM;
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case PIPE_FORMAT_R10G10B10X2_UNORM:
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case PIPE_FORMAT_B10G10R10A2_UNORM:
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case PIPE_FORMAT_B10G10R10X2_UNORM:
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return PIPE_FORMAT_R10G10B10A2_UNORM;
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case PIPE_FORMAT_A4B4G4R4_UNORM:
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case PIPE_FORMAT_B4G4R4A4_UNORM:
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return PIPE_FORMAT_R4G4B4A4_UNORM;
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default:
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return format;
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}
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}
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/* AFBC supports compressing a few canonical formats. Additional formats are
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* available by using a canonical internal format. Given a PIPE format, find
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* the canonical AFBC internal format if it exists, or NONE if the format
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* cannot be compressed. */
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enum pan_afbc_mode
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panfrost_afbc_format(unsigned arch, enum pipe_format format)
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{
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/* sRGB does not change the pixel format itself, only the
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* interpretation. The interpretation is handled by conversion hardware
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* independent to the compression hardware, so we can compress sRGB
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* formats by using the corresponding linear format.
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*/
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format = util_format_linear(format);
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/* Luminance-alpha not supported for AFBC on v7+ */
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switch (format) {
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case PIPE_FORMAT_A8_UNORM:
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case PIPE_FORMAT_L8_UNORM:
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case PIPE_FORMAT_I8_UNORM:
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case PIPE_FORMAT_L8A8_UNORM:
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if (arch >= 7)
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return PAN_AFBC_MODE_INVALID;
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else
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break;
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default:
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break;
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}
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/* We handle swizzling orthogonally to AFBC */
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format = unswizzled_format(format);
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/* clang-format off */
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switch (format) {
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case PIPE_FORMAT_R8_UNORM: return PAN_AFBC_MODE_R8;
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case PIPE_FORMAT_R8G8_UNORM: return PAN_AFBC_MODE_R8G8;
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case PIPE_FORMAT_R8G8B8_UNORM: return PAN_AFBC_MODE_R8G8B8;
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case PIPE_FORMAT_R8G8B8A8_UNORM: return PAN_AFBC_MODE_R8G8B8A8;
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case PIPE_FORMAT_R5G6B5_UNORM: return PAN_AFBC_MODE_R5G6B5;
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case PIPE_FORMAT_R5G5B5A1_UNORM: return PAN_AFBC_MODE_R5G5B5A1;
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case PIPE_FORMAT_R10G10B10A2_UNORM: return PAN_AFBC_MODE_R10G10B10A2;
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case PIPE_FORMAT_R4G4B4A4_UNORM: return PAN_AFBC_MODE_R4G4B4A4;
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case PIPE_FORMAT_Z16_UNORM: return PAN_AFBC_MODE_R8G8;
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case PIPE_FORMAT_Z24_UNORM_S8_UINT: return PAN_AFBC_MODE_R8G8B8A8;
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case PIPE_FORMAT_Z24X8_UNORM: return PAN_AFBC_MODE_R8G8B8A8;
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case PIPE_FORMAT_X24S8_UINT: return PAN_AFBC_MODE_R8G8B8A8;
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default: return PAN_AFBC_MODE_INVALID;
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}
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/* clang-format on */
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}
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/* The lossless colour transform (AFBC_FORMAT_MOD_YTR) requires RGB. */
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bool
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panfrost_afbc_can_ytr(enum pipe_format format)
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{
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const struct util_format_description *desc = util_format_description(format);
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/* YTR is only defined for RGB(A) */
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if (desc->nr_channels != 3 && desc->nr_channels != 4)
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return false;
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/* The fourth channel if it exists doesn't matter */
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return desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB;
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}
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/* Only support packing for RGB formats for now. */
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bool
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panfrost_afbc_can_pack(enum pipe_format format)
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{
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const struct util_format_description *desc = util_format_description(format);
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return desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB;
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}
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