Hyprland/src/render/OpenGL.hpp

#pragma once

#include "../defines.hpp"
#include "../helpers/Monitor.hpp"
#include "../helpers/Color.hpp"
#include <list>
#include <unordered_map>

#include <cairo/cairo.h>

#include "Shader.hpp"
#include "Texture.hpp"
#include "Framebuffer.hpp"

inline const float fullVerts[] = {
    1, 0,  // top right
    0, 0,  // top left
    1, 1,  // bottom right
    0, 1,  // bottom left
};
inline const float fanVertsFull[] = {
    -1.0f, -1.0f,
    1.0f, -1.0f,
    1.0f, 1.0f,
    -1.0f, 1.0f
};

struct SMonitorRenderData {
    CFramebuffer primaryFB;
    CFramebuffer mirrorFB;     // these are used for some effects,
    CFramebuffer mirrorSwapFB; // etc

    CFramebuffer monitorMirrorFB; // used for mirroring outputs

    CTexture     stencilTex;

    CFramebuffer blurFB;
    bool         blurFBDirty = true;

    wlr_box      backgroundTexBox;

    // Shaders
    bool                    m_bShadersInitialized = false;
    CShader                 m_shQUAD;
    CShader                 m_shRGBA;
    CShader                 m_shRGBX;
    CShader                 m_shEXT;
    CShader                 m_shBLUR1;
    CShader                 m_shBLUR2;
    CShader                 m_shSHADOW;
    CShader                 m_shBORDER1;
    //
};

struct SCurrentRenderData {
    CMonitor*   pMonitor = nullptr;
    float       projection[9];

    SMonitorRenderData* pCurrentMonData = nullptr;

    pixman_region32_t* pDamage = nullptr;

    Vector2D    primarySurfaceUVTopLeft = Vector2D(-1, -1);
    Vector2D    primarySurfaceUVBottomRight = Vector2D(-1, -1);

    wlr_box     clipBox = {};
};

class CHyprOpenGLImpl {
public:

    CHyprOpenGLImpl();

    void    begin(CMonitor*, pixman_region32_t*, bool fake = false);
    void    end();

    void    renderRect(wlr_box*, const CColor&, int round = 0);
    void    renderRectWithDamage(wlr_box*, const CColor&, pixman_region32_t* damage, int round = 0);
    void    renderTexture(wlr_texture*, wlr_box*, float a, int round = 0, bool allowCustomUV = false);
    void    renderTexture(const CTexture&, wlr_box*, float a, int round = 0, bool discardOpaque = false, bool allowCustomUV = false);
    void    renderTextureWithBlur(const CTexture&, wlr_box*, float a, wlr_surface* pSurface, int round = 0);
    void    renderRoundedShadow(wlr_box*, int round, int range, float a = 1.0);
    void    renderBorder(wlr_box*, const CColor&, int round);

    void    makeWindowSnapshot(CWindow*);
    void    makeLayerSnapshot(SLayerSurface*);
    void    renderSnapshot(CWindow**);
    void    renderSnapshot(SLayerSurface**);

    void    clear(const CColor&);
    void    clearWithTex();
    void    scissor(const wlr_box*, bool transform = true);
    void    scissor(const pixman_box32*, bool transform = true);
    void    scissor(const int x, const int y, const int w, const int h, bool transform = true);

    void    destroyMonitorResources(CMonitor*);

    void    markBlurDirtyForMonitor(CMonitor*);

    void    preWindowPass();
    void    preRender(CMonitor*);

    void    saveBufferForMirror();
    void    renderMirrored();

    SCurrentRenderData m_RenderData;

    GLint  m_iCurrentOutputFb = 0;
    GLint  m_iWLROutputFb = 0;

    CWindow* m_pCurrentWindow = nullptr; // hack to get the current rendered window

    pixman_region32_t m_rOriginalDamageRegion; // used for storing the pre-expanded region

    std::unordered_map<CWindow*, CFramebuffer> m_mWindowFramebuffers;
    std::unordered_map<SLayerSurface*, CFramebuffer> m_mLayerFramebuffers;
    std::unordered_map<CMonitor*, SMonitorRenderData> m_mMonitorRenderResources;
    std::unordered_map<CMonitor*, CTexture> m_mMonitorBGTextures;

private:
    std::list<GLuint>       m_lBuffers;
    std::list<GLuint>       m_lTextures;

    int                     m_iDRMFD;
    std::string             m_szExtensions;

    bool                    m_bFakeFrame = false;
    bool                    m_bEndFrame = false;

    GLuint                  createProgram(const std::string&, const std::string&);
    GLuint                  compileShader(const GLuint&, std::string);
    void                    createBGTextureForMonitor(CMonitor*);
    void                    initShaders();

    // returns the out FB, can be either Mirror or MirrorSwap
    CFramebuffer*           blurMainFramebufferWithDamage(float a, wlr_box* pBox, pixman_region32_t* damage);

    void                    renderTextureInternalWithDamage(const CTexture&, wlr_box* pBox, float a, pixman_region32_t* damage, int round = 0, bool discardOpaque = false, bool noAA = false, bool allowCustomUV = false, bool allowDim = false);
    void                    renderSplash(cairo_t *const, cairo_surface_t *const, double);

    void                    preBlurForCurrentMonitor();
};

inline std::unique_ptr<CHyprOpenGLImpl> g_pHyprOpenGL;