Method FindLocalSize

layers/state_tracker/shader_module.cpp:1636–1661

Because the following is legal, need the entry point OpEntryPoint GLCompute %main "name_a" OpEntryPoint GLCompute %main "name_b" Assumes shader module contains no spec constants used to set the local size values

//    OpEntryPoint GLCompute %main "name_b"
// Assumes shader module contains no spec constants used to set the local size values
LocalSize Module::FindLocalSize(const EntryPoint& entrypoint) const {
    LocalSize local_size;
    // "If an object is decorated with the WorkgroupSize decoration, this takes precedence over any LocalSize or LocalSizeId
    // execution mode."
    if (static_data_.has_built_in_workgroup_size) {
        const Instruction* composite_def = FindDef(static_data_.built_in_workgroup_size_id);
        if (composite_def->Opcode() == spv::OpConstantComposite) {
            // VUID-WorkgroupSize-WorkgroupSize-04427 makes sure this is a OpTypeVector of int32
            local_size.x = GetConstantValueById(composite_def->Word(3));
            local_size.y = GetConstantValueById(composite_def->Word(4));
            local_size.z = GetConstantValueById(composite_def->Word(5));
            return local_size;
        }
    }

    if (entrypoint.execution_mode.Has(ExecutionModeSet::local_size_bit)) {
        local_size = entrypoint.execution_mode.local_size;
    } else if (entrypoint.execution_mode.Has(ExecutionModeSet::local_size_id_bit)) {
        // Uses ExecutionModeLocalSizeId so need to resolve ID value
        local_size.x = GetConstantValueById(entrypoint.execution_mode.local_size.x);
        local_size.y = GetConstantValueById(entrypoint.execution_mode.local_size.y);
        local_size.z = GetConstantValueById(entrypoint.execution_mode.local_size.z);
    }

    return local_size;
}

uint32_t Module::CalculateWorkgroupSharedMemory() const {
    uint32_t total_size = 0;