create_sampler()

vk::Sampler MayaFlux::Core::BackendResourceManager::create_sampler	(	vk::Filter	filter = vk::Filter::eLinear,
		vk::SamplerAddressMode	address_mode = vk::SamplerAddressMode::eRepeat,
		float	max_anisotropy = 0.0F
	)

Create sampler.

Parameters

filter	Mag/min filter
address_mode	Texture address mode (wrap, clamp, etc.)
anisotropy	Max anisotropy (0 = disabled)

Returns

Sampler handle

Definition at line 696 of file BackendResoureManager.cpp.

{
    size_t hash = 0;
    auto hash_combine = [](size_t& seed, size_t value) {
        seed ^= value + 0x9e3779b9 + (seed << 6) + (seed >> 2);
    };
 
    hash_combine(hash, static_cast<size_t>(filter));
    hash_combine(hash, static_cast<size_t>(address_mode));
    hash_combine(hash, std::hash<float> {}(max_anisotropy));
 
    auto it = m_sampler_cache.find(hash);
    if (it != m_sampler_cache.end()) {
        MF_DEBUG(Journal::Component::Core, Journal::Context::GraphicsBackend,
            "Reusing cached sampler (hash: 0x{:X})", hash);
        return it->second;
    }
 
    vk::SamplerCreateInfo sampler_info;
    sampler_info.magFilter = filter;
    sampler_info.minFilter = filter;
    sampler_info.mipmapMode = vk::SamplerMipmapMode::eLinear;
    sampler_info.addressModeU = address_mode;
    sampler_info.addressModeV = address_mode;
    sampler_info.addressModeW = address_mode;
    sampler_info.mipLodBias = 0.0F;
    sampler_info.anisotropyEnable = max_anisotropy > 0.0F;
    sampler_info.maxAnisotropy = max_anisotropy;
    sampler_info.compareEnable = VK_FALSE;
    sampler_info.compareOp = vk::CompareOp::eAlways;
    sampler_info.minLod = 0.0F;
    sampler_info.maxLod = VK_LOD_CLAMP_NONE;
    sampler_info.borderColor = vk::BorderColor::eFloatOpaqueBlack;
    sampler_info.unnormalizedCoordinates = VK_FALSE;
 
    vk::Sampler sampler;
    try {
        sampler = m_context.get_device().createSampler(sampler_info);
    } catch (const vk::SystemError& e) {
        MF_ERROR(Journal::Component::Core, Journal::Context::GraphicsBackend,
            "Failed to create sampler: {}", e.what());
        return nullptr;
    }
 
    m_sampler_cache[hash] = sampler;
 
    MF_INFO(Journal::Component::Core, Journal::Context::GraphicsBackend,
        "Created sampler (filter: {}, address: {}, anisotropy: {}, hash: 0x{:X})",
        vk::to_string(filter), vk::to_string(address_mode), max_anisotropy, hash);
 
    return sampler;
}

References MayaFlux::Journal::Core, MayaFlux::Core::VKContext::get_device(), MayaFlux::Journal::GraphicsBackend, m_context, m_sampler_cache, MF_DEBUG, MF_ERROR, and MF_INFO.

Referenced by MayaFlux::Portal::Graphics::TextureLoom::create_sampler().

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