DebugRenderer.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2021 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
#pragma once
 
#ifndef JPH_DEBUG_RENDERER
    #error This file should only be included when JPH_DEBUG_RENDERER is defined
#endif // !JPH_DEBUG_RENDERER
 
#ifndef JPH_DEBUG_RENDERER_EXPORT
    // By default export the debug renderer
    #define JPH_DEBUG_RENDERER_EXPORT JPH_EXPORT
#endif // !JPH_DEBUG_RENDERER_EXPORT
 
#include <Jolt/Core/Color.h>
#include <Jolt/Core/Reference.h>
#include <Jolt/Core/HashCombine.h>
#include <Jolt/Core/UnorderedMap.h>
#include <Jolt/Math/Float2.h>
#include <Jolt/Geometry/IndexedTriangle.h>
#include <Jolt/Geometry/AABox.h>
 
JPH_NAMESPACE_BEGIN
 
class OrientedBox;
 
class JPH_DEBUG_RENDERER_EXPORT DebugRenderer
{
public:
    JPH_OVERRIDE_NEW_DELETE
 
                                        DebugRenderer();
    virtual                             ~DebugRenderer();
 
    virtual void                        DrawLine(RVec3Arg inFrom, RVec3Arg inTo, ColorArg inColor) = 0;
 
    void                                DrawWireBox(const AABox &inBox, ColorArg inColor);
    void                                DrawWireBox(const OrientedBox &inBox, ColorArg inColor);
    void                                DrawWireBox(RMat44Arg inMatrix, const AABox &inBox, ColorArg inColor);
 
    void                                DrawMarker(RVec3Arg inPosition, ColorArg inColor, float inSize);
 
    void                                DrawArrow(RVec3Arg inFrom, RVec3Arg inTo, ColorArg inColor, float inSize);
 
    void                                DrawCoordinateSystem(RMat44Arg inTransform, float inSize = 1.0f);
 
    void                                DrawPlane(RVec3Arg inPoint, Vec3Arg inNormal, ColorArg inColor, float inSize);
 
    void                                DrawWireTriangle(RVec3Arg inV1, RVec3Arg inV2, RVec3Arg inV3, ColorArg inColor);
 
    template <class VERTEX_ARRAY>
    void                                DrawWirePolygon(RMat44Arg inTransform, const VERTEX_ARRAY &inVertices, ColorArg inColor, float inArrowSize = 0.0f) { for (typename VERTEX_ARRAY::size_type i = 0; i < inVertices.size(); ++i) DrawArrow(inTransform * inVertices[i], inTransform * inVertices[(i + 1) % inVertices.size()], inColor, inArrowSize); }
 
    void                                DrawWireSphere(RVec3Arg inCenter, float inRadius, ColorArg inColor, int inLevel = 3);
    void                                DrawWireUnitSphere(RMat44Arg inMatrix, ColorArg inColor, int inLevel = 3);
 
    enum class ECastShadow
    {
        On,                             // This shape should cast a shadow
        Off                             // This shape should not cast a shadow
    };
 
    enum class EDrawMode
    {
        Solid,                          
        Wireframe,                      
    };
 
    virtual void                        DrawTriangle(RVec3Arg inV1, RVec3Arg inV2, RVec3Arg inV3, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::Off) = 0;
 
    void                                DrawBox(const AABox &inBox, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
    void                                DrawBox(RMat44Arg inMatrix, const AABox &inBox, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
 
    void                                DrawSphere(RVec3Arg inCenter, float inRadius, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
    void                                DrawUnitSphere(RMat44Arg inMatrix, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
 
    void                                DrawCapsule(RMat44Arg inMatrix, float inHalfHeightOfCylinder, float inRadius, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
 
    void                                DrawCylinder(RMat44Arg inMatrix, float inHalfHeight, float inRadius, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
 
    void                                DrawOpenCone(RVec3Arg inTop, Vec3Arg inAxis, Vec3Arg inPerpendicular, float inHalfAngle, float inLength, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
 
    void                                DrawSwingLimits(RMat44Arg inMatrix, float inSwingYHalfAngle, float inSwingZHalfAngle, float inEdgeLength, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
 
    void                                DrawPie(RVec3Arg inCenter, float inRadius, Vec3Arg inNormal, Vec3Arg inAxis, float inMinAngle, float inMaxAngle, ColorArg inColor, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid);
 
    static DebugRenderer *              sInstance;
 
    class Vertex
    {
    public:
        Float3                          mPosition;
        Float3                          mNormal;
        Float2                          mUV;
        Color                           mColor;
    };
 
    class JPH_DEBUG_RENDERER_EXPORT Triangle
    {
    public:
                                        Triangle() = default;
                                        Triangle(Vec3Arg inV1, Vec3Arg inV2, Vec3Arg inV3, ColorArg inColor);
                                        Triangle(Vec3Arg inV1, Vec3Arg inV2, Vec3Arg inV3, ColorArg inColor, Vec3Arg inUVOrigin, Vec3Arg inUVDirection);
 
        Vertex                          mV[3];
    };
 
    using Batch = Ref<RefTargetVirtual>;
 
    class LOD
    {
    public:
        Batch                           mTriangleBatch;
        float                           mDistance;
    };
 
    class Geometry : public RefTarget<Geometry>
    {
    public:
        JPH_OVERRIDE_NEW_DELETE
 
                                        Geometry(const AABox &inBounds) : mBounds(inBounds) { }
                                        Geometry(const Batch &inBatch, const AABox &inBounds) : mBounds(inBounds) { mLODs.push_back({ inBatch, FLT_MAX }); }
 
        Array<LOD>                      mLODs;
 
        AABox                           mBounds;
    };
 
    using GeometryRef = Ref<Geometry>;
 
    static AABox                        sCalculateBounds(const Vertex *inVertices, int inVertexCount);
 
    virtual Batch                       CreateTriangleBatch(const Triangle *inTriangles, int inTriangleCount) = 0;
    virtual Batch                       CreateTriangleBatch(const Vertex *inVertices, int inVertexCount, const uint32 *inIndices, int inIndexCount) = 0;
    Batch                               CreateTriangleBatch(const Array<Triangle> &inTriangles) { return CreateTriangleBatch(inTriangles.empty()? nullptr : &inTriangles[0], int(inTriangles.size())); }
    Batch                               CreateTriangleBatch(const Array<Vertex> &inVertices, const Array<uint32> &inIndices) { return CreateTriangleBatch(inVertices.empty()? nullptr : &inVertices[0], int(inVertices.size()), inIndices.empty()? nullptr : &inIndices[0], int(inIndices.size())); }
    Batch                               CreateTriangleBatch(const VertexList &inVertices, const IndexedTriangleNoMaterialList &inTriangles);
 
    using SupportFunction = function<Vec3 (Vec3Arg inDirection)>;
    Batch                               CreateTriangleBatchForConvex(SupportFunction inGetSupport, int inLevel, AABox *outBounds = nullptr);
    GeometryRef                         CreateTriangleGeometryForConvex(SupportFunction inGetSupport);
 
    enum class ECullMode
    {
        CullBackFace,                   
        CullFrontFace,                  
        Off                             
    };
 
    virtual void                        DrawGeometry(RMat44Arg inModelMatrix, const AABox &inWorldSpaceBounds, float inLODScaleSq, ColorArg inModelColor, const GeometryRef &inGeometry, ECullMode inCullMode = ECullMode::CullBackFace, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid) = 0;
    void                                DrawGeometry(RMat44Arg inModelMatrix, ColorArg inModelColor, const GeometryRef &inGeometry, ECullMode inCullMode = ECullMode::CullBackFace, ECastShadow inCastShadow = ECastShadow::On, EDrawMode inDrawMode = EDrawMode::Solid) { DrawGeometry(inModelMatrix, inGeometry->mBounds.Transformed(inModelMatrix), max(max(inModelMatrix.GetAxisX().LengthSq(), inModelMatrix.GetAxisY().LengthSq()), inModelMatrix.GetAxisZ().LengthSq()), inModelColor, inGeometry, inCullMode, inCastShadow, inDrawMode); }
 
    virtual void                        DrawText3D(RVec3Arg inPosition, const string_view &inString, ColorArg inColor = Color::sWhite, float inHeight = 0.5f) = 0;
 
protected:
    void                                Initialize();
 
private:
    void                                DrawWireUnitSphereRecursive(RMat44Arg inMatrix, ColorArg inColor, Vec3Arg inDir1, Vec3Arg inDir2, Vec3Arg inDir3, int inLevel);
 
    void                                CreateQuad(Array<uint32> &ioIndices, Array<Vertex> &ioVertices, Vec3Arg inV1, Vec3Arg inV2, Vec3Arg inV3, Vec3Arg inV4);
 
    void                                Create8thSphereRecursive(Array<uint32> &ioIndices, Array<Vertex> &ioVertices, Vec3Arg inDir1, uint32 &ioIdx1, Vec3Arg inDir2, uint32 &ioIdx2, Vec3Arg inDir3, uint32 &ioIdx3, const Float2 &inUV, SupportFunction inGetSupport, int inLevel);
    void                                Create8thSphere(Array<uint32> &ioIndices, Array<Vertex> &ioVertices, Vec3Arg inDir1, Vec3Arg inDir2, Vec3Arg inDir3, const Float2 &inUV, SupportFunction inGetSupport, int inLevel);
 
    // Predefined shapes
    GeometryRef                         mBox;
    GeometryRef                         mSphere;
    GeometryRef                         mCapsuleTop;
    GeometryRef                         mCapsuleMid;
    GeometryRef                         mCapsuleBottom;
    GeometryRef                         mOpenCone;
    GeometryRef                         mCylinder;
 
    struct SwingLimits
    {
        bool                            operator == (const SwingLimits &inRHS) const    { return mSwingYHalfAngle == inRHS.mSwingYHalfAngle && mSwingZHalfAngle == inRHS.mSwingZHalfAngle; }
 
        float                           mSwingYHalfAngle;
        float                           mSwingZHalfAngle;
    };
 
    JPH_MAKE_HASH_STRUCT(SwingLimits, SwingLimitsHasher, t.mSwingYHalfAngle, t.mSwingZHalfAngle)
 
    using SwingBatches = UnorderedMap<SwingLimits, GeometryRef, SwingLimitsHasher>;
    SwingBatches                        mSwingLimits;
 
    using PieBatces = UnorderedMap<float, GeometryRef>;
    PieBatces                           mPieLimits;
};
 
JPH_NAMESPACE_END