ShadowMapping.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/renderer/fwd-tdme.h>
#include <tdme/engine/subsystems/rendering/fwd-tdme.h>
#include <tdme/engine/subsystems/shadowmapping/fwd-tdme.h>
#include <tdme/math/fwd-tdme.h>
#include <tdme/math/Matrix4x4.h>
#include <tdme/utilities/fwd-tdme.h>
 
using std::vector;
using std::unique_ptr;
 
using tdme::engine::subsystems::renderer::Renderer;
using tdme::engine::subsystems::rendering::EntityRenderer;
using tdme::engine::subsystems::shadowmapping::ShadowMap;
using tdme::engine::Engine;
using tdme::math::Matrix4x4;
using tdme::math::Vector3;
using tdme::math::Vector4;
 
/**
 * Shadow mapping module
 * @author Andreas Drewke
 */
class tdme::engine::subsystems::shadowmapping::ShadowMapping final
{
    friend class tdme::engine::Engine;
    friend class ShadowMap;
 
private:
    enum ShadowMapping_RunState {NONE, CREATE, RENDER};
 
    Renderer* renderer { nullptr };
    EntityRenderer* entityRenderer { nullptr };
 
    Matrix4x4 shadowTransformMatrix;
    Matrix4x4 depthBiasMVPMatrix;
 
    Engine* engine { nullptr };
 
    vector<unique_ptr<ShadowMap>> shadowMaps;
    ShadowMapping_RunState runState { NONE };
 
    vector<Object*> visibleObjectsReceivingShadows;
 
public:
    // forbid class copy
    FORBID_CLASS_COPY(ShadowMapping)
 
    /**
     * Constructor
     * @param engine engine
     * @param renderer renderer
     * @param entityRenderer entityRenderer
     */
    ShadowMapping(Engine* engine, Renderer* renderer, EntityRenderer* entityRenderer);
 
    /**
     * Destructor
     */
    ~ShadowMapping();
 
    /**
     * @return engine
     */
    inline Engine* getEngine() {
        return engine;
    }
 
    /**
     * Reshape shadow maps
     * @param width width
     * @param height height
     */
    void reshape(int32_t width, int32_t height);
 
    /**
     * Get shadow map
     * @param idx index
     * @return shadow map
     */
    inline ShadowMap* getShadowMap(int idx) {
        return shadowMaps[idx].get();
    }
 
    /**
     * Create shadow maps
     */
    void createShadowMaps();
 
    /**
     * Render shadow maps to world
     * @param visibleObjects visible objects
     */
    void renderShadowMaps(const vector<Object*>& visibleObjects);
 
    /**
     * Dispose shadow maps
     */
    void dispose();
 
    /**
     * Start object transform
     * @param contextIdx context index
     * @param transformMatrix transform matrix
     */
    void startObjectTransform(int contextIdx, Matrix4x4& transformMatrix);
 
    /**
     * End object transform
     */
    void endObjectTransform();
 
    /**
     * Update matrices
     * @param contextIdx context index
     */
    void updateMatrices(int contextIdx);
 
    /**
     * Update texture matrix
     * @param contextIdx context index
     */
    void updateTextureMatrix(int contextIdx);
 
    /**
     * Update material
     * @param contextIdx context index
     */
    void updateMaterial(int contextIdx);
 
    /**
     * Set shader
     * @param contextIdx context index
     * @param id shader id
     */
    void setShader(int contextIdx, const string& id);
 
    /**
     * Update light
     * @param lightId light id
     */
    void updateLight(int contextIdx, int32_t lightId);
 
    /**
     * Update shader parameters
     * @param context
     */
    void updateShaderParameters(int contextIdx);
 
    /**
     * Bind texture
     * @param textureId texture id
     */
    void bindTexture(int contextIdx, int32_t textureId);
 
    /**
     * Update depth bias mvp matrix with given matrix
     * @param contextIdx context index
     * @param depthBiasMVPMatrix depth bias MVP matrix
     */
    void updateDepthBiasMVPMatrix(int contextIdx, Matrix4x4& depthBiasMVPMatrix);
 
    /**
     * Update depth bias mvp matrix / upload only
     * @param contextIdx context index
     */
    void updateDepthBiasMVPMatrix(int contextIdx);
 
};