Volumetric.h

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#pragma once
 
#include <string>
#include <glm/mat4x4.hpp>
#include <glm/vec3.hpp>
 
namespace eve::graphics {
 
class Canvas;
class Drawable;
class Graphics;
class Mesh;
class Shader;
class Texture;
 
class Volumetric {
public:
    explicit Volumetric(Graphics *gfx);
    ~Volumetric();
 
    Volumetric(const Volumetric &) = delete;
    Volumetric &operator=(const Volumetric &) = delete;
 
    void setQuality(const std::string &quality);
    std::string getQuality() const { return quality_; }
 
    void setMode(const std::string &mode);
    std::string getMode() const { return mode_; }
 
    void setLightScreenUV(float u, float v);
    float getLightScreenU() const;
    float getLightScreenV() const;
 
    void setLightScreenPos(float x, float y, float width, float height);
 
    void setLightDirection(float dx, float dy, float dz);
 
    void setCamera(float eyeX, float eyeY, float eyeZ, float targetX, float targetY, float targetZ,
                   float upX, float upY, float upZ, float fovYDeg, float aspect, float nearZ,
                   float farZ);
 
    void setInvViewProj(const glm::mat4 &invViewProj);
 
    void setShaftColor(float r, float g, float b);
    void setFogColor(float r, float g, float b);
    void setIntensity(float intensity);
    void setTime(float seconds);
    void setDensity(float density);
 
    void setFogHeight(float worldY);
    void setFogHeightFalloff(float falloff);
    void setFogStart(float startDistance);
    void setFogEnd(float endDistance);
    void setFogNoise(float amount);
 
    bool hasParam(const std::string &name) const;
    void setFloat(const std::string &name, float value);
    float getFloat(const std::string &name) const;
 
    int getSampleCount() const;
    float getDownscale() const { return downscale_; }
 
    void beginOcclusionMap(Graphics *gfx, float lightPixelX, float lightPixelY,
                           float lightRadiusPixels = 24.f);
 
    void drawOccluder(Graphics *gfx, Drawable *drawable, const glm::mat4 &matrix);
 
    void drawOccluderSolid(Graphics *gfx, float x, float y, float w, float h);
    void drawOccluderTexture(Graphics *gfx, Texture *texture, float x, float y, float w, float h);
 
    void scatter(Graphics *gfx, Texture *occlusion);
 
    void scatterTo(Graphics *gfx, Texture *occlusion, Canvas *dest);
 
    void applyFromScene(Graphics *gfx, Texture *scene);
    void applyFromSceneTo(Graphics *gfx, Texture *scene, Canvas *dest);
 
    void rayMarch(Graphics *gfx, Texture *linearDepth);
    void rayMarchTo(Graphics *gfx, Texture *linearDepth, Canvas *dest);
 
    void applyFog(Graphics *gfx, Texture *linearDepth);
    void applyFogTo(Graphics *gfx, Texture *linearDepth, Canvas *dest);
 
    Texture *newLinearDepthTexture(Graphics *gfx, int width, int height,
                                   float (*depth01)(int x, int y, void *userdata), void *userdata);
 
    int resolutionFor(int fullSize) const;
 
    void drawOccluders2D(Graphics *gfx);
 
    Shader *getShader() const { return shader_; }
    Shader *getRayMarchShader() const { return rayShader_; }
    Shader *getFogShader() const { return fogShader_; }
 
private:
    void applyQualityDefaults();
    void uploadCommon(bool compositeFromScene);
    void uploadRayMarchCommon();
    void uploadFogCommon();
    void drawFullscreen(Graphics *gfx, Texture *source, Shader *shader);
 
    Graphics *gfx_ = nullptr;     // not owned
    Shader *shader_ = nullptr;    // owned by Graphics (screenspace)
    Shader *rayShader_ = nullptr; // owned by Graphics (ray march)
    Shader *fogShader_ = nullptr; // owned by Graphics (volumetric fog)
    std::string quality_ = "medium";
    std::string mode_ = "screenspace";
    float downscale_ = 2.f;
    glm::mat4 invViewProj_{1.f};
    float nearZ_ = 0.1f;
    float farZ_ = 100.f;
    glm::vec3 lightDir_{0.4f, 1.f, 0.3f};
    float fogHeight_ = 0.f;
    float fogHeightFalloff_ = 0.15f;
    float fogStart_ = 2.f;
    float fogEnd_ = 40.f;
    float fogNoise_ = 0.35f;
};
 
}  // namespace eve::graphics