00001 /*************************************************************************** 00002 *cr 00003 *cr (C) Copyright 1995-2019 The Board of Trustees of the 00004 *cr University of Illinois 00005 *cr All Rights Reserved 00006 *cr 00007 ***************************************************************************/ 00008 00009 /*************************************************************************** 00010 * RCS INFORMATION: 00011 * 00012 * $RCSfile: VolumeTexture.h,v $ 00013 * $Author: johns $ $Locker: $ $State: Exp $ 00014 * $Revision: 1.10 $ $Date: 2020年10月22日 03:43:24 $ 00015 * 00016 *************************************************************************** 00017 * DESCRIPTION: 00018 * Class for managing volumetric texture maps for use by the various 00019 * DrawMolItem representation methods. 00020 ***************************************************************************/ 00021 00022 #ifndef VOLUME_TEXTURE_H_ 00023 #define VOLUME_TEXTURE_H_ 00024 00025 #include <stddef.h> 00026 00027 class VolumetricData; 00028 class Scene; 00029 00030 class VolumeTexture { 00031 public: 00032 // constructor - initialize values, no memory allocation. 00033 VolumeTexture(); 00034 // Destructor 00035 ~VolumeTexture(); 00036 00037 // Assign reference to grid data. Caller must ensure that the 00038 // lifetime of the volumetric data is at least as long as the VolumeTexture 00039 // instance; for VMD this should be fine since we currently never delete 00040 // VolumetricData instances. This invalidates any previously generated 00041 // texture maps. 00042 void setGridData(VolumetricData *); 00043 00044 // 00045 // routines to generate texture maps from the grid data. 00046 // 00047 00049 void generatePosTexture(); 00050 00052 void generateIndexTexture(); 00053 00054 // a charge-oriented texturing method 00055 void generateChargeTexture(float datamin, float datamax); 00056 00057 // HSV color ramp 00058 void generateHSVTexture(float datamin, float datamax); 00059 00060 // VMD color scale color ramp 00061 void generateColorScaleTexture(float datamin, float datamax, const Scene *); 00062 00063 void generateContourLineTexture(float densityperline, float linewidth); 00064 00065 // Get an ID for the current texture; this gets incremented whenever the 00066 // texture changes. 00067 unsigned long getTextureID() const { return texid; } 00068 00069 // Get the size of the current texture along x/y/z axes. 00070 const int *getTextureSize() const { return size; } 00071 00072 // Return a pointer to the texture map. This data is allocated using 00073 // vmd_alloc and will exist for the lifetime of the VolumeTexture instance. 00074 unsigned char *getTextureMap() const { return texmap; } 00075 00076 // Calculate texgen plane equations for the current texture. 00077 void calculateTexgenPlanes(float v0[4], float v1[4], float v2[4], float v3[4]) const; 00078 00079 private: 00080 VolumetricData *v; 00081 unsigned char *texmap; 00082 int size[3]; 00083 unsigned long texid; 00084 00085 // copy and operator= disallowed 00086 VolumeTexture(VolumeTexture &) {} 00087 VolumeTexture &operator=(VolumeTexture &) { return *this; } 00088 00089 // compute texel count from current size[] 00090 ptrdiff_t num_texels(void) { return ptrdiff_t(size[0])*ptrdiff_t(size[1])*ptrdiff_t(size[2]); } 00091 00092 // allocate texture memory for n texels (3n bytes), and update texid. 00093 // Return success. 00094 int allocateTextureMap(ptrdiff_t ntexels); 00095 }; 00096 00097 #endif 00098