ShadowMap.h

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#pragma once
 
#include <memory>
#include <vector>
 
#include <tdme/tdme.h>
#include <tdme/engine/fwd-tdme.h>
#include <tdme/engine/subsystems/shadowmapping/fwd-tdme.h>
#include <tdme/engine/FrameBuffer.h>
#include <tdme/math/fwd-tdme.h>
#include <tdme/math/Matrix4x4.h>
#include <tdme/math/Vector3.h>
#include <tdme/utilities/fwd-tdme.h>
 
using std::unique_ptr;
using std::vector;
 
using tdme::engine::subsystems::shadowmapping::ShadowMapping;
using tdme::engine::Camera;
using tdme::engine::FrameBuffer;
using tdme::engine::Light;
using tdme::engine::Object;
using tdme::math::Matrix4x4;
using tdme::math::Vector3;
 
/**
 * Shadow map
 * @author Andreas Drewke
 */
class tdme::engine::subsystems::shadowmapping::ShadowMap final
{
    friend class ShadowMapping;
 
private:
    vector<Object*> visibleObjects;
    ShadowMapping* shadowMapping { nullptr };
    unique_ptr<Camera> lightCamera;
    unique_ptr<FrameBuffer> frameBuffer;
    Matrix4x4 biasMatrix;
    Matrix4x4 depthBiasMVPMatrix;
 
    /**
     * Initialize shadow map
     */
    void initialize();
 
    /**
     * Reshape frame buffer
     * @param width width
     * @param height height
     */
    void reshape(int32_t width, int32_t height);
 
    /**
     * Disposes this shadow map
     */
    void dispose();
 
    /**
     * Binds frame buffer depth texture
     * @param contextIdx context index
     */
    void bindDepthBufferTexture(int contextIdx);
 
    /**
     * @return light camera
     */
    Camera* getCamera();
 
    /**
     * Create shadow map
     * @param light light
     */
    void createShadowMap(Light* light);
 
    /**
     * Computes shadow texture matrix and stores it
     */
    void computeDepthBiasMVPMatrix();
 
    /**
     * Set up shadow texture matrix computed and stored before
     * @param contextIdx context index
     */
    void updateDepthBiasMVPMatrix(int contextIdx);
 
public:
    static constexpr int32_t TEXTUREUNIT { 9 };
 
    // forbid class copy
    FORBID_CLASS_COPY(ShadowMap)
 
    /**
     * Public constructor
     * @param shadowMapping shadow mapping
     * @param width width
     * @param height height
     */
    ShadowMap(ShadowMapping* shadowMapping, int32_t width, int32_t height);
 
    /**
     * Destructor
     */
    ~ShadowMap();
 
    /**
     * @return width
     */
    inline int32_t getWidth() {
        return frameBuffer->getWidth();
    }
 
    /**
     * @return height
     */
    inline int32_t getHeight() {
        return frameBuffer->getWidth();
    }
 
    /**
     * @return frame buffer
     */
    inline FrameBuffer* getFrameBuffer() {
        return frameBuffer.get();
    }
 
};