feed() [1/2]

void MayaFlux::Buffers::ShaderProcessor::feed	(	const std::string &	name,
		FeedSource	source
	)

Supply a shader input from a callable, resolved by name.

Parameters

name	A name already declared on this shader: a descriptor in config.bindings, or a push constant field from the ShaderSpec this processor was constructed from.
source	Callable pulled each cycle. Returns a DataVariant for a descriptor name, a double for a push constant field.

Resolution happens once, here. Descriptor names take precedence; a name matching neither is an error and registers nothing. File-shader processors have no record of push constant field names, so their constant feeds must use the explicit overload.

Definition at line 212 of file ShaderProcessor.cpp.

{
    if (!source) {
        MF_ERROR(Journal::Component::Buffers, Journal::Context::BufferProcessing,
            "feed: null source for '{}'", name);
        return;
    }
 
    if (m_config.bindings.contains(name)) {
        auto& entry = m_feeds[name];
        entry.source = std::move(source);
        entry.is_storage = true;
        entry.offset = 0;
        entry.size = 0;
        entry.descriptor_name = name;
        entry.buffer.reset();
        entry.mismatch_logged = false;
        return;
    }
 
    uint32_t offset = 0;
    for (const auto& field : m_config.pc_fields) {
        const size_t width = Kakshya::gpu_data_format_bytes(field.format);
        if (field.name == name) {
            auto& entry = m_feeds[name];
            entry.source = std::move(source);
            entry.is_storage = false;
            entry.offset = offset;
            entry.size = width;
            entry.descriptor_name.clear();
            entry.buffer.reset();
            entry.mismatch_logged = false;
            return;
        }
        offset += static_cast<uint32_t>(width);
    }
 
    MF_ERROR(Journal::Component::Buffers, Journal::Context::BufferProcessing,
        "feed: '{}' matches no descriptor and no push constant field. "
        "File-shader processors must supply an explicit offset.",
        name);
}

References MayaFlux::Buffers::ShaderConfig::bindings, MayaFlux::Journal::BufferProcessing, MayaFlux::Journal::Buffers, MayaFlux::Kakshya::gpu_data_format_bytes(), m_config, m_feeds, MF_ERROR, offset, MayaFlux::Buffers::ShaderConfig::pc_fields, and width.

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