uniform_buffer.h

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#pragma once
 
#include "render/opengl_labels.h"
 
namespace eu
{
    struct m4;
}
 
namespace eu::render
{
 
enum class UniformType
{
    invalid,
    bool_type,
    int_type,
    float_type,
    vec2,
    vec3,
    vec4,
    mat4
};
 
struct UniformBufferSetup
{
    int size = 512;
    int binding_point = 1;
    std::string name;
    std::string source;
};
 
struct CompiledUniformProp
{
    int offset = -1;
    UniformType type = UniformType::invalid;
    int array_count = -1;
};
 
struct UniformProp
{
    CompiledUniformProp* target;
    UniformType type;
    std::string name;
    int array_count;
};
 
struct UniformBufferCompiler
{
    void add(CompiledUniformProp* target, UniformType type, const std::string& name, int array_count = 1);
 
    [[nodiscard]]
    UniformBufferSetup compile(const std::string& name, int binding_point) const;
 
    std::vector<UniformProp> props;
};
 
struct UniformBuffer
{
    DEBUG_LABEL_EXPLICIT_MANY UniformBuffer(DEBUG_LABEL_ARG_MANY const UniformBufferSetup& setup);
    ~UniformBuffer();
 
    void set_mat4(const CompiledUniformProp& prop, const m4& m);
 
    UniformBuffer(const UniformBuffer&) = delete;
    void operator=(const UniformBuffer&) = delete;
 
    UniformBuffer(UniformBuffer&&) noexcept;
    UniformBuffer& operator=(UniformBuffer&&) noexcept;
 
    // clears the loaded buffer to a invalid buffer
    void unload();
 
    unsigned int id;
};
 
struct BoundUniformBuffer
{
    explicit BoundUniformBuffer(UniformBuffer* b);
    ~BoundUniformBuffer();
 
    BoundUniformBuffer(const BoundUniformBuffer&) = delete;
    BoundUniformBuffer(BoundUniformBuffer&&) = delete;
    void operator=(const BoundUniformBuffer&) = delete;
    void operator=(BoundUniformBuffer&&) = delete;
 
    UniformBuffer* buffer;
};
 
}  //  namespace klotter