attribute_convert.cc

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/* SPDX-FileCopyrightText: 2005 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include "BLI_array_utils.hh"
 
#include "BKE_attribute_math.hh"
 
#include "GPU_vertex_buffer.hh"
 
#include "attribute_convert.hh"
 
namespace blender::draw {
 
GPUVertFormat init_format_for_attribute(const bke::AttrType data_type, const StringRef vbo_name)
{
  GPUVertFormat format{};
  bke::attribute_math::convert_to_static_type(data_type, [&](auto dummy) {
    using T = decltype(dummy);
    using Converter = AttributeConverter<T>;
    if constexpr (!std::is_void_v<typename Converter::VBOType>) {
      GPU_vertformat_attr_add_legacy(&format,
                                     vbo_name,
                                     Converter::gpu_component_type,
                                     Converter::gpu_component_len,
                                     Converter::gpu_fetch_mode);
    }
  });
  return format;
}
 
void vertbuf_data_extract_direct(const GSpan attribute, gpu::VertBuf &vbo)
{
  bke::attribute_math::convert_to_static_type(attribute.type(), [&](auto dummy) {
    using T = decltype(dummy);
    using Converter = AttributeConverter<T>;
    using VBOType = typename Converter::VBOType;
    if constexpr (!std::is_void_v<VBOType>) {
      const Span<T> src = attribute.typed<T>();
      MutableSpan<VBOType> data = vbo.data<VBOType>();
      if constexpr (std::is_same_v<T, VBOType>) {
        array_utils::copy(src, data);
      }
      else {
        threading::parallel_for(src.index_range(), 8192, [&](const IndexRange range) {
          for (const int i : range) {
            data[i] = Converter::convert(src[i]);
          }
        });
      }
    }
  });
}
 
}  // namespace blender::draw