Function WriteMeshAttributes

engine/gamesys/src/gamesys/components/comp_model.cpp:821–856

    }

    static uint8_t* WriteMeshAttributes(dmRender::HRenderContext render_context, MeshRenderItem* render_item, dmGraphics::VertexStepFunction step_function, dmGraphics::VertexAttributeInfos* attribute_infos, uint8_t* write_ptr, uint32_t vertex_count)
    {
        dmVMath::Matrix4 normal_matrix = dmRender::GetNormalMatrix(render_context, render_item->m_World);

        const float* world_matrix_channels[]         = { (float*) &render_item->m_World };
        const float* normal_matrix_channels[]        = { (float*) &normal_matrix };
        const float* texture_transform_2d_channels[] = { dmRig::TEXTURE_TRANSFORM_2D_IDENTITY };

    #define UNPACK_ATTRIBUTE_PTR(name) \
        (render_item->m_Mesh->name.m_Count ? render_item->m_Mesh->name.m_Data : 0)
        const float* uv_channels[]            = { UNPACK_ATTRIBUTE_PTR(m_Texcoord0), UNPACK_ATTRIBUTE_PTR(m_Texcoord1), };
        const float* color_channels[]         = { UNPACK_ATTRIBUTE_PTR(m_Colors) };
        const float* position_channels[]      = { UNPACK_ATTRIBUTE_PTR(m_Positions) };
        const float* normal_channels[]        = { UNPACK_ATTRIBUTE_PTR(m_Normals) };
        const float* tangent_channels[]       = { UNPACK_ATTRIBUTE_PTR(m_Tangents) };
    #undef UNPACK_ATTRIBUTE_PTR

        uint32_t uv_channels_count = (uv_channels[0] ? 1 : 0) + (uv_channels[1] ? 1 : 0);

        dmGraphics::WriteAttributeParams params = {};
        dmRig::SetMeshWriteAttributeParams(&params,
            attribute_infos,
            step_function,
            world_matrix_channels,
            normal_matrix_channels,
            0, // World space positions are not supported by local space materials
            position_channels,
            normal_channels,
            tangent_channels,
            color_channels,
            texture_transform_2d_channels,
            uv_channels,
            uv_channels_count);

        return dmGraphics::WriteAttributes(write_ptr, 0, vertex_count, params);
    }

    static void SetMeshAttributeRenderData(ModelWorld* world, ModelComponent* component, dmRender::HRenderContext render_context, const dmGraphics::VertexAttributeInfos* material_infos, const dmGraphics::VertexAttributeInfos* attribute_infos, MeshRenderItem* render_item, dmGraphics::VertexAttribute* model_attributes, uint32_t model_attribute_count, MeshAttributeRenderData* rd)
    {