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2023-08-07 19:29:24 +08:00
commit 34d6c5d489
4832 changed files with 1389451 additions and 0 deletions
--- a/Cry3DEngine/cbuffer.h
+++ b/Cry3DEngine/cbuffer.h
@@ -0,0 +1,97 @@
+////////////////////////////////////////////////////////////////////////////
+//
+//  Crytek Engine Source File.
+//  Copyright (C), Crytek Studios, 2002.
+// -------------------------------------------------------------------------
+//  File name:   cbuffer.h
+//  Version:     v1.00
+//  Created:     30/5/2002 by Vladimir Kajalin
+//  Compilers:   Visual Studio.NET
+//  Description: Occlusion buffer
+// -------------------------------------------------------------------------
+//  History:
+//
+////////////////////////////////////////////////////////////////////////////
+#ifndef _CBUFFER_H
+#define _CBUFFER_H
+
+#define COVERAGEBUFFER_SIZE 128
+#define COVERAGEBUFFER_OCCLUDERS_MAX_DISTANCE 32
+#define COVERAGEBUFFER_OCCLUSION_TESTERS_MIN_DISTANCE 32
+
+class CCoverageBuffer
+{
+  uchar m_Buffer[COVERAGEBUFFER_SIZE][COVERAGEBUFFER_SIZE];
+  IRenderer * m_pRenderer;
+  int   m_matViewPort[4];
+  float m_matCombined[16];
+  Plane m_Planes[6];
+
+  struct Point2d 
+  { 
+    float x,y; 
+    Point2d(){};
+    Point2d(float _x, float _y) { x=_x; y=_y; }
+    Point2d operator - (Point2d & o) { return Point2d (x - o.x,y - o.y); }
+  };
+
+  Point2d ProjectToScreen(const float & x, const float & y, const float & z);
+  void ScanTriangle(Point2d p1,Point2d p2,Point2d p3);
+  void ScanTriangleWithCliping(Point2d p1,Point2d p2,Point2d p3,
+                               const Vec3d & v1,const Vec3d & v2,const Vec3d & v3);
+  void ScanLine(int x1, int x2, int y, float & dxdyl, float & dxdyr);
+  bool IsQuadVisible(const Point2d & min2d, const Point2d & max2d);
+
+	#if defined(WIN32) && defined(_CPU_X86)
+  inline int fastfround(float f) // note: only positive numbers works correct
+  {
+    int i;
+    __asm fld [f]
+    __asm fistp [i]
+    return i;
+  }
+	#else
+  inline int fastfround(float f) { int i; i=(int)(f+0.5f); return i; } // note: only positive numbers works correct
+	#endif
+
+  void TransformPoint(float out[4], const float m[16], const float in[4]);
+  void MatMul4( float *product, const float *a, const float *b );
+  static int ClipEdge(const Vec3d & v1, const Vec3d & v2, const Plane & ClipPlane, Vec3d & vRes1, Vec3d & vRes2);
+
+  // tmp containers
+  list2<Vec3d> m_arrVerts3dWS_AddMesh;
+  list2<Point2d> m_arrVerts_AddMesh;
+
+  int m_nTrisInBuffer;
+
+public:
+
+  CCoverageBuffer(IRenderer * pRenderer)
+  { 
+    m_pRenderer = pRenderer; 
+    memset(m_Buffer,0,sizeof(m_Buffer)); 
+    m_nTrisInBuffer=0;
+  }
+
+  // start new frame
+  void BeginFrame(const CCamera & camera);
+
+  // render into buffer
+  void AddBBox(const Vec3d & vMins, const Vec3d & vMaxs, const Vec3d & vDirToCamera);
+  void AddMesh(const Vec3d * arrVerts3d, int nVertCount, const int * pIndices, int nIndCount, Matrix44 * pTranRotMatrix);
+  
+  // test visibility
+  bool IsBBoxVisible(const Vec3d & vMins, const Vec3d & vMaxs);
+  bool __IsSphereVisible(const Vec3d & vCenter, float fRadius, float fDistance);
+  bool IsPixelVisible(int nScreenX, int nScreenY);
+
+  // draw content to the screen for debug
+  void DrawDebug(int nStep);
+
+  // can be used by other classes
+  static void ClipPolygon(list2<Vec3d> * pPolygon, const Plane & ClipPlane);
+};
+
+
+
+#endif