Method UpdateSRB

Hydrogent/src/HnMaterial.cpp:719–1017

}

void HnMaterial::UpdateSRB(HnRenderDelegate& RendererDelegate)
{
    RefCntAutoPtr<HnMaterialSRBCache> SRBCache{RendererDelegate.GetMaterialSRBCache(), IID_HnMaterialSRBCache};
    VERIFY_EXPR(SRBCache);

    HN_MATERIAL_TEXTURES_BINDING_MODE BindingMode = static_cast<const HnRenderParam*>(RendererDelegate.GetRenderParam())->GetTextureBindingMode();

    const Uint32 AtlasVersion = RendererDelegate.GetTextureRegistry().GetAtlasVersion();
    if (BindingMode == HN_MATERIAL_TEXTURES_BINDING_MODE_ATLAS && AtlasVersion != m_AtlasVersion)
    {
        m_SRB.Release();
        m_PrimitiveAttribsVar            = nullptr;
        m_PBRPrimitiveAttribsBufferRange = 0;
        m_AtlasVersion                   = AtlasVersion;
    }

    if (m_SRB)
        return;

    const USD_Renderer&             UsdRenderer       = *RendererDelegate.GetUSDRenderer();
    const PBR_Renderer::CreateInfo& RendererSettings  = UsdRenderer.GetSettings();
    const Uint32                    TexturesArraySize = RendererSettings.MaterialTexturesArraySize;

    // Texture array to bind to "g_MaterialTextures"
    std::vector<ITexture*> TexArray;

    // Standalone textures not allocated in the atlas.
    std::unordered_map<PBR_Renderer::TEXTURE_ATTRIB_ID, ITexture*> StandaloneTextures;

    HnMaterialSRBCache::ResourceKey SRBKey;

    if (BindingMode == HN_MATERIAL_TEXTURES_BINDING_MODE_LEGACY ||
        BindingMode == HN_MATERIAL_TEXTURES_BINDING_MODE_ATLAS)
    {
        // Allocated texture atlas formats, for example:
        //     {RGBA8_UNORM, R8_UNORM, RGBA8_UNORM_SRGB}
        std::vector<TEXTURE_FORMAT> AtlasFormats;

        // Texture atlas format to atlas id, for example:
        //     RGBA8_UNORM      -> 0
        //     R8_UNORM         -> 1
        //     RGBA8_UNORM_SRGB -> 2
        std::unordered_map<TEXTURE_FORMAT, Uint32> AtlasFormatIds;
        if (BindingMode == HN_MATERIAL_TEXTURES_BINDING_MODE_ATLAS)
        {
            AtlasFormats = RendererDelegate.GetResourceManager().GetAllocatedAtlasFormats();
            for (Uint32 i = 0; i < AtlasFormats.size(); ++i)
            {
                AtlasFormatIds.emplace(AtlasFormats[i], i);
            }
        }

        TexArray.resize(TexturesArraySize);

        PBR_Renderer::StaticShaderTextureIdsArrayType StaticShaderTexIds;
        StaticShaderTexIds.fill(decltype(PBR_Renderer::InvalidMaterialTextureId){PBR_Renderer::InvalidMaterialTextureId});

        for (Uint32 id = 0; id < PBR_Renderer::TEXTURE_ATTRIB_ID_COUNT; ++id)