postproc.h

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#pragma once
 
#include <memory>
 
#include "eu/render/texture.h"
 
namespace eu::imgui
{
    struct ImguiShaderCache;
}
 
namespace eu::render
{
struct Texture2d;
struct Renderer;
struct Camera;
struct World;
struct RenderWorld;


struct PostProcArg
{
    const World* world = nullptr;
    Size window_size = {.width = 0, .height = 0};
    Rect final_rect = {};
    const Camera* camera = nullptr;
    Renderer* renderer = nullptr;
};

struct RenderSource
{
    RenderSource() = default;
    virtual ~RenderSource() = default;
 
    RenderSource(const RenderSource&) = delete;
    RenderSource(RenderSource&&) = delete;
    void operator=(const RenderSource&) = delete;
    void operator=(RenderSource&&) = delete;
 
    virtual void render(const PostProcArg& arg) = 0;
};

struct ShaderPropertyProvider
{
    ShaderPropertyProvider() = default;
    virtual ~ShaderPropertyProvider() = default;
 
    ShaderPropertyProvider(const ShaderPropertyProvider&) = delete;
    ShaderPropertyProvider(ShaderPropertyProvider&&) = delete;
    void operator=(const ShaderPropertyProvider&) = delete;
    void operator=(ShaderPropertyProvider&&) = delete;
 
    virtual void use_shader(const PostProcArg& a, const FrameBuffer& t) = 0;
};

struct RenderTextureWithShader : RenderSource
{
    std::string name;
    std::shared_ptr<RenderSource> source;
    std::shared_ptr<FrameBuffer> fbo;
    ShaderPropertyProvider* effect;
 
    RenderTextureWithShader(std::string n, std::shared_ptr<RenderSource> s, std::shared_ptr<FrameBuffer> f, ShaderPropertyProvider* e);

    void render(const PostProcArg& arg) override;

    void update(const PostProcArg& arg);
};

struct CompiledStack
{
    std::shared_ptr<RenderSource> last_source;
 
    std::vector<std::shared_ptr<RenderTextureWithShader>> targets;
};
 

struct BuildArg
{
    CompiledStack* builder;
    Size window_size;
};
 
 
struct EffectStack;

struct Effect
{
    Effect() = default;
    virtual ~Effect() = default;
 
    Effect(const Effect&) = delete;
    Effect(Effect&&) = delete;
    void operator=(const Effect&) = delete;
    void operator=(Effect&&) = delete;
 
    virtual void build(const BuildArg& arg) = 0;
    virtual void update(float dt) = 0;
    virtual void gui() = 0;
 
    [[nodiscard]] bool enabled() const;
 
   protected:
 
    void set_enabled(bool n);
 
   private:
 
    friend struct EffectStack;
 
    bool is_enabled = false;
    EffectStack* owner = nullptr;
};

struct FactorEffect : Effect
{
    FactorEffect();
    [[nodiscard]] float get_factor() const;
    void set_factor(float f);
 
   private:
 
    float factor = 0.0f;
};

struct EffectStack
{
    int current_msaa_setting = -1;
    bool dirty = true;
    std::optional<Size> window_size;
    std::vector<std::shared_ptr<Effect>> effects;
    CompiledStack compiled;
 
    // render world settings
    // todo(Gustav): is it useful to disable hdr rendering or should that just be removed?
    // todo(Gustav): move exposure to a better place?
    bool use_hdr = true;
    float exposure = 1.0f;
 
    std::shared_ptr<RenderWorld> render_world;

    void render(const PostProcArg& arg);
    void update(float dt) const;
    void gui(imgui::ImguiShaderCache* cache);
};

 
}