vertex_layout.h

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#pragma once
 
#include <map>
#include <set>
#include <optional>
 
namespace eu::core
{


enum class VertexType
{
    // vertex based
    position2xy,
    position2xz,
    position3,
    normal3,
    color3,
    color4,
    texture2,
 
    // instance based
    instance_transform
};
 
 
constexpr bool is_instance_based(VertexType v)
{
    switch (v)
    {
    case VertexType::instance_transform: return true;
    default: return false;
    }
}

struct VertexElementDescription
{
    VertexType type;
    std::string name;
};

using ShaderVertexAttributes = std::vector<VertexElementDescription>;
 
std::vector<VertexType> find_duplicates(const ShaderVertexAttributes& items);

struct CompiledVertexElement
{
    VertexType type;
    std::string name;
    int index;
};

struct CompiledVertexElementNoName
{
    VertexType type;
    int index;
};
 
using VertexTypes = std::vector<VertexType>;

struct CompiledShaderVertexAttributes
{
    std::vector<CompiledVertexElement> elements;
    VertexTypes debug_types;
};

struct CompiledGeomVertexAttributes
{
    std::vector<CompiledVertexElementNoName> elements;
    VertexTypes debug_types;
};

struct CompiledVertexTypeList
{
    std::map<VertexType, int> indices;
    VertexTypes debug_types;
    int next_index;
};

struct InstanceProp
{
    VertexType type;
    std::string name;
};
 
[[nodiscard]]
CompiledShaderVertexAttributes compile_shader_layout(
    const CompiledVertexTypeList& l,
    const ShaderVertexAttributes& elements,
    std::optional<InstanceProp> instance_prop,
    std::optional<int> start_index
);
 
[[nodiscard]]
CompiledGeomVertexAttributes get_geom_layout(const CompiledVertexTypeList& l);
 
CompiledVertexTypeList compile_attribute_layouts(
    const std::vector<VertexType>& base_layout, const std::vector<ShaderVertexAttributes>& descriptions
);
 
CompiledVertexTypeList compile_attribute_layouts(const std::vector<ShaderVertexAttributes>& descriptions);

 
}  //  namespace eu::core
 
EU_FMT_ENUM_BEGIN(eu::core::VertexType, "???")
    EU_FMT_ENUM_VAL(instance_transform);
    EU_FMT_ENUM_VAL(position2xy);
    EU_FMT_ENUM_VAL(position2xz);
    EU_FMT_ENUM_VAL(position3);
    EU_FMT_ENUM_VAL(normal3);
    EU_FMT_ENUM_VAL(color3);
    EU_FMT_ENUM_VAL(color4);
    EU_FMT_ENUM_VAL(texture2);
EU_FMT_ENUM_END()