9313750f0a
This patch adds an alternative path for devices/OSs which do not support native texture atomics in Metal. Support is encapsulated within the backend, ensuring any allocated texture with the USAGE_ATOMIC flag is allocated with a backing buffer, upon which atomic operations happen. The shader generation is also changed for the atomic case, which instructs the backend to insert additional buffer bind-points for the buffer resource. As Metal also only supports buffer-backed textures for textureBuffers or 2D textures, TextureArrays and 3D textures are emulated within a 2D texture, with sample locations being indirected. All usage of atomic textures MUST now utilise the correct atomic texture types in the high level shader and GPUShaderCreateInfo declarations. Authored by Apple: Michael Parkin-White Pull Request: https://projects.blender.org/blender/blender/pulls/115956
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup gpu
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*/
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#pragma once
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namespace blender {
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namespace gpu {
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/*** Derived from: https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf ***/
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/** Upper Bound/Fixed Limits **/
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#define MTL_MAX_TEXTURE_SLOTS 128
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#define MTL_MAX_SAMPLER_SLOTS MTL_MAX_TEXTURE_SLOTS
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/* Max limit without using bind-less for samplers. */
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#define MTL_MAX_DEFAULT_SAMPLERS 16
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/* Total maximum buffers which can be bound to an encoder, for use within a shader.
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* Uniform buffers and storage buffers share the set of available bind buffers.
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* The total number of buffer bindings must be <= MTL_MAX_BUFFER_BINDINGS
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* We also require an additional 3 core buffers for:
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* - Argument buffer for bindless resources (e.g. samplers)
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* - Transform feedback buffer
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* - Default push constant block
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* Along with up to 6+1 buffers for vertex data, and index data. */
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#define MTL_MAX_BUFFER_BINDINGS 31
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#define MTL_MAX_VERTEX_INPUT_ATTRIBUTES 31
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#define MTL_MAX_UNIFORMS_PER_BLOCK 64
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/* Context-specific limits -- populated in 'MTLBackend::platform_init' */
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struct MTLCapabilities {
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/* Variable Limits & feature sets. */
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int max_color_render_targets = 4; /* Minimum = 4 */
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int buffer_alignment_for_textures = 256; /* Upper bound = 256 bytes */
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int minimum_buffer_offset_alignment = 256; /* Upper bound = 256 bytes */
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/* Capabilities */
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bool supports_vertex_amplification = false;
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bool supports_texture_swizzle = true;
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bool supports_cubemaps = true;
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bool supports_layered_rendering = true;
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bool supports_memory_barriers = false;
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bool supports_sampler_border_color = false;
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bool supports_argument_buffers_tier2 = false;
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bool supports_texture_gather = false;
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bool supports_texture_atomics = false;
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/* GPU Family */
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bool supports_family_mac1 = false;
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bool supports_family_mac2 = false;
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bool supports_family_mac_catalyst1 = false;
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bool supports_family_mac_catalyst2 = false;
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};
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} // namespace gpu
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} // namespace blender
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