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63 lines
2.7 KiB
C++
63 lines
2.7 KiB
C++
// MobileGL - MobileGL/MG_Backend/DirectVulkan/Renderer/VkClearManager.h
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// Copyright (c) 2025-2026 MobileGL-Dev
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// Licensed under the GNU Lesser General Public License v3.0:
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// https://www.gnu.org/licenses/gpl-3.0.txt
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// https://www.gnu.org/licenses/lgpl-3.0.txt
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// SPDX-License-Identifier: LGPL-3.0-only
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// End of Source File Header
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#pragma once
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#include "../VkIncludes.h"
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#include "../VulkanRendererConfig.h"
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#include "MG_State/GLState/FramebufferState/FramebufferObject.h"
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#include "MG_Util/Math/VectorTypes.h"
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#include <Includes.h>
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#include <atomic>
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#include <unordered_map>
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namespace MobileGL::MG_Backend::DirectVulkan {
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struct ClearFramebufferPayload {
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FloatVec4 color;
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Float depth{};
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Uint32 stencil{};
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};
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// A colour clear reaches us from one of glClear/ClearBufferfv, ClearBufferiv or
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// ClearBufferuiv, and Vulkan reads VkClearColorValue's union according to the destination
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// image's format rather than converting between the members - a float written where an
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// integer format is expected is reinterpreted bit for bit, not rounded. Remember which entry
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// point supplied the value so the member written when the clear is materialized matches.
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enum class ClearColorEncoding : Uint8 {
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Float,
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Int,
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Uint
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};
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struct ClearAttachmentPayload {
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GLbitfield mask = 0;
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FloatVec4 color = FloatVec4(0.0f, 0.0f, 0.0f, 0.0f);
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ClearColorEncoding colorEncoding = ClearColorEncoding::Float;
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IntVec4 colorInt = IntVec4(0, 0, 0, 0);
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UintVec4 colorUint = UintVec4(0u, 0u, 0u, 0u);
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Float depth = 1.0f;
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Uint32 stencil = 0;
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};
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// Builds the clear value for `payload` in the union member its encoding calls for.
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// `formatLacksAlpha` applies GL's rule that a format without an alpha channel reads as one,
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// expressed in whichever type matches (GL 4.6 core 15.2.3).
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VkClearColorValue MakeVkClearColorValue(const ClearAttachmentPayload& payload, Bool formatLacksAlpha);
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// vkCmdClearColorImage names the image, so the driver applies the destination format's transfer
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// function to whatever value it is handed. Every other write path in this backend goes through
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// the UNORM twin view while GL_FRAMEBUFFER_SRGB is off (ResolveSrgbAttachmentWriteFormat) and
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// therefore stores the raw value GL asked for. Rewrites `payload` to the linear colour whose
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// encoding is that raw value, so a direct image clear of an sRGB destination agrees with them.
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// A no-op for every other format, for integer clear encodings, and when GL is doing the
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// encoding itself.
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void PreCompensateSrgbClearColor(ClearAttachmentPayload& payload, VkFormat destinationFormat);
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} // namespace MobileGL::MG_Backend::DirectVulkan
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