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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2025 lsfg-vk
// SPDX-License-Identifier: GPL-3.0-or-later
#include <algorithm>
#include "video_core/renderer_vulkan/present/lsfg_chain.h"
#include "video_core/renderer_vulkan/present/lsfg_shaders.h"
#include "video_core/vulkan_common/vulkan_device.h"
namespace Vulkan {
namespace {
constexpr u32 FIXED_DESCRIPTOR_SETS = 64;
constexpr u32 DESCRIPTOR_SETS_PER_SLOT = 112;
constexpr size_t FIRST_DELTA_LEVEL = 4;
} // Anonymous namespace
LsfgChain::LsfgChain(const Device& device, MemoryAllocator& memory_allocator,
const LsfgShaders& shaders, VkExtent2D extent, VkFormat format,
f32 flow_scale)
: resources{device, memory_allocator, flow_scale},
descriptor_pool{CreateLsfgDescriptorPool(
device, FIXED_DESCRIPTOR_SETS +
DESCRIPTOR_SETS_PER_SLOT * static_cast<u32>(LSFG_GENERATION_SLOTS))} {
for (auto& image : frames) {
image = LsfgImage(device, memory_allocator, extent, format);
}
mipmaps = LsfgMipmaps(device, memory_allocator, shaders, resources, descriptor_pool, frames,
flow_scale);
alpha_passes = LsfgAlphaPasses(device, shaders);
for (size_t i = 0; i < LSFG_MIP_LEVELS; ++i) {
alpha[i] = LsfgAlpha(device, memory_allocator, alpha_passes, resources, descriptor_pool,
mipmaps.Output(i));
}
beta = LsfgBeta(device, memory_allocator, shaders, resources, descriptor_pool,
alpha[0].Outputs());
for (size_t i = 0; i < LSFG_MIP_LEVELS; ++i) {
const size_t level = LSFG_MIP_LEVELS - 1 - i;
gamma[i] = LsfgGamma(device, memory_allocator, shaders, resources, descriptor_pool,
alpha[level].Outputs(),
beta.Output(std::min(level, LSFG_BETA_OUTPUTS - 1)),
i == 0 ? nullptr : &gamma[i - 1].Output());
if (i < FIRST_DELTA_LEVEL) {
continue;
}
const size_t index = i - FIRST_DELTA_LEVEL;
delta[index] = LsfgDelta(
device, memory_allocator, shaders, resources, descriptor_pool, alpha[level].Outputs(),
beta.Output(level), i == FIRST_DELTA_LEVEL ? nullptr : &gamma[i - 1].Output(),
i == FIRST_DELTA_LEVEL ? nullptr : &delta[index - 1].Output1(),
i == FIRST_DELTA_LEVEL ? nullptr : &delta[index - 1].Output2());
}
generate = LsfgGenerate(device, shaders, resources, descriptor_pool, frames,
gamma[LSFG_MIP_LEVELS - 1].Output(),
delta[LSFG_DELTA_INSTANCES - 1].Output1(),
delta[LSFG_DELTA_INSTANCES - 1].Output2());
}
void LsfgChain::DispatchShared(vk::CommandBuffer cmdbuf, u64 frame_count) {
mipmaps.Dispatch(cmdbuf, frame_count);
for (size_t stage = 0; stage < LSFG_ALPHA_STAGES; ++stage) {
LsfgBarriers barriers(cmdbuf);
for (auto& level : alpha) {
level.PushBarriers(barriers, frame_count, stage);
}
barriers.Build();
alpha_passes.Get(stage).BindPipeline(cmdbuf);
for (auto& level : alpha) {
level.DispatchStage(cmdbuf, frame_count, stage);
}
}
beta.Dispatch(cmdbuf, frame_count);
}
void LsfgChain::DispatchGeneration(vk::CommandBuffer cmdbuf, u64 frame_count,
size_t generation_count, size_t generation, u32 target,
VkImage image, VkExtent2D extent) {
const size_t slot = LsfgGenerationSlot(generation_count, generation);
for (size_t i = 0; i < LSFG_MIP_LEVELS; ++i) {
gamma[i].Dispatch(cmdbuf, frame_count, slot);
if (i >= FIRST_DELTA_LEVEL) {
delta[i - FIRST_DELTA_LEVEL].Dispatch(cmdbuf, frame_count, slot);
}
}
generate.Dispatch(cmdbuf, frame_count, slot, target, image, extent);
}
} // namespace Vulkan
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