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vpGeti(3) Library Functions Manual vpGeti(3) NAME vpGeti, vpGetd, vpGetp - get the value of an option SYNOPSIS #include <volpack.h> vpResult vpGeti(vpc, option, iptr) vpContext *vpc; int option; int *iptr; vpResult vpGetd(vpc, option, dptr) vpContext *vpc; int option; double *dptr; vpResult vpGetp(vpc, option, pptr) vpContext *vpc; int option; void *pptr; ARGUMENTS vpc VolPack context from vpCreateContext. option Constant that specifies the option to be retrieved. iptr Location to store an integer result. dptr Location to store a double result. pptr Location to store a pointer result. DESCRIPTION These functions are used the get the values of integer-, double- or pointer-valued state variables in a rendering context. The following list summarizes the integer-valued options that can be retrieved with vpGeti. The value of the option is stored in the location given by iptr; the return value of vpGeti is not the value of the option. Un- less otherwise noted, the result is a single integer and iptr should point to a single integer location. VP_XLEN Get the length of the X dimension of the volume in voxels. VP_YLEN Get the length of the Y dimension of the volume in voxels. VP_ZLEN Get the length of the Y dimension of the volume in voxels. VP_BYTES_PER_VOXEL Get the size of a voxel in bytes. VP_VOXEL_FIELD_COUNT Get the number of fields in a voxel. VP_SHADE_FIELD_COUNT Get the number of fields in a voxel used as parameters for shad- ing the voxel. VP_FIELD_SIZES Get the size of each voxel field in bytes. iptr must point to an array of integers containing one entry for each voxel field (use VP_VOXEL_FIELD_COUNT to determine the number of fields). VP_FIELD_OFFSETS Get the byte offset from the beginning of a voxel for each voxel field. iptr must point to an array of integers containing one entry for each voxel field (use VP_VOXEL_FIELD_COUNT to deter- mine the number of fields). VP_FIELD_MAXES Get the maximum value of the quantity stored in each voxel field. iptr must point to an array of integers containing one entry for each voxel field (use VP_VOXEL_FIELD_COUNT to deter- mine the number of fields). VP_VOXEL_DATA_SIZE Get the size (in bytes) of the 3D voxel array. VP_VOXEL_XSTRIDE Get the stride (in bytes) for the X dimension of the 3D voxel array. VP_VOXEL_YSTRIDE Get the stride (in bytes) for the Y dimension of the 3D voxel array. VP_VOXEL_ZSTRIDE Get the stride (in bytes) for the Z dimension of the 3D voxel array. VP_CLASSIFY_FIELD_COUNT Get the number of fields in a voxel used as parameters for clas- sifying the voxel (the number of arguments to the opacity trans- fer function). VP_CLASSIFY_FIELDS Get the field numbers for the arguments to the opacity transfer function. iptr must point to an array of integers containing one entry for each argument (use VP_CLASSIFY_FIELD_COUNT to de- termine the number of arguments). VP_CLASSIFY_TABLE_SIZES Get the size (in bytes) of each lookup table used for the opac- ity transfer function. iptr must point to an array of integers containing one entry for each lookup table (use VP_CLAS- SIFY_FIELD_COUNT to determine the number of lookup tables, which equals the number of arguments to the opacity transfer func- tion). VP_COLOR_CHANNELS Get the number of color channels that the current shading lookup tables or shading callback function will produce. VP_SHADE_COLOR_SIZE Get the size of the shading lookup table for color values (see vpSetLookupShader(3)). VP_SHADE_WEIGHT_SIZE Get the size of the shading lookup table for weight values (see vpSetLookupShader(3)). VP_MATERIAL_COUNT Get the number of material types used by the current lookup shader (see vpSetLookupShader(3)). VP_SHADE_COLOR_FIELD Get the field number used for indexing the shading lookup table for color values (see vpSetLookupShader(3)). VP_SHADE_WEIGHT_FIELD Get the field number used for indexing the shading lookup table for weight values (see vpSetLookupShader(3)). VP_LIGHT0 VP_LIGHT1 VP_LIGHT2 VP_LIGHT3 VP_LIGHT4 VP_LIGHT5 The retrieved value is nonzero if the corresponding light is en- abled, or 0 if it is disabled. VP_LIGHT_BOTH_SIDES The retrieved value is nonzero if two-sided lighting is enabled (see vpSetLight(3)), or 0 if it is disabled. VP_REVERSE_SURFACE_SIDES The retrieved value is nonzero if the definitions of interior and exterior surfaces have been reversed (see vpSetMaterial(3)), or 0 if they have not. VP_DEPTH_CUE The retrieved value is nonzero if depth cueing is enabled, or 0 if it is disabled. VP_DEPTH_CUE_TABLE_SIZE Get the current number of entries in the depth cueing table (see vpSetDepthCueing(3)). VP_DEPTH_CUE_SIZE_HINT Get the current hint for the number of entries in the depth cue- ing table (see vpSetDepthCueing(3)). VP_CURRENT_MATRIX Get the identifier for the current transformation matrix (VP_MODEL, VP_VIEW or VP_PROJECT). VP_CONCAT_MODE Get the identifier for the current matrix concatenation mode (VP_CONCAT_LEFT or VP_CONCAT_RIGHT). VP_IMAGE_WIDTH Get the width (in pixels) of the output image array. VP_IMAGE_HEIGHT Get the height (in pixels) of the output image array. VP_IMAGE_SCAN_SIZE Get the number bytes per scanline in the output image array. VP_VIEW_AXIS Get the identifier for the current major viewing axis in the ob- ject coordinate system (VP_X_AXIS, VP_Y_AXIS or VP_Z_AXIS). The axis depends on the viewing transformation. VP_INTERMEDIATE_WIDTH Get the width (in pixels) of the intermediate image required to render the current volume with the current viewing transforma- tion (see vpRenderRawVolume(3)). VP_INTERMEDIATE_HEIGHT Get the height (in pixels) of the intermediate image required to render the current volume with the current viewing transforma- tion (see vpRenderRawVolume(3)). VP_INTERMEDIATE_COLOR Get the number of color channels in the intermediate image (see vpRenderRawVolume(3)). VP_INT_WIDTH_HINT Get the current hint for the width (in pixels) of the intermedi- ate image (see vpRenderRawVolume(3)). VP_INT_HEIGHT_HINT Get the current hint for the height (in pixels) of the interme- diate image (see vpRenderRawVolume(3)). VP_VIEW_X_AXIS VP_VIEW_Y_AXIS VP_VIEW_Z_AXIS The retrieved value is non-zero if computing a preclassified volume for the corresponding major viewing axis is enabled (see vpClassifyVolume(3)). VP_VIEW_X_SIZE VP_VIEW_Y_SIZE VP_VIEW_Z_SIZE Get the size (in bytes) of the preclassified volume for the cor- responding major viewing axis. VP_MMOCTREE_THRESHOLDS Get the current min-max octree range thresholds. iptr must point to an array of integers containing one entry for each threshold (use VP_CLASSIFY_FIELD_COUNT to determine the number of thresholds, which equals the number of arguments to the opac- ity transfer function). VP_MMOCTREE_SIZE Get the size (in bytes) of the min-max octree. VP_SHADOW The retrieved value is nonzero if shadows are enabled (see vpSetShadowLookupShader(3)). VP_SHADOW_LIGHT Get the constant (e.g. VP_LIGHT0) associated with the current shadow light (see vpSetShadowLookupShader(3)). VP_SHADOW_WIDTH_HINT Get the current hint for the width (in pixels) of the shadow buffer (see vpSetShadowLookupShader(3)). VP_SHADOW_HEIGHT_HINT Get the current hint for the height (in pixels) of the shadow buffer (see vpSetShadowLookupShader(3)). VP_SHADOW_COLOR_SIZE Get the size of the shading lookup table for shadowed color val- ues (see vpSetShadowLookupShader(3)). VP_SHADOW_BIAS Get the current shadow bias value (see vpSetShadowLookup- Shader(3)). VP_PIXEL_TYPE Get the current image pixel type (see vpSetImage(3)). VP_CLAMP_SHADE_TABLE The retrieved value is nonzero if clamping is enabled for shade table entries, or 0 if it is disabled (see vpShadeTable(3)). VP_COMPOSITE_ORDER This value is used for debugging only. It returns 1 if the cur- rent major viewing axis (VP_VIEW_AXIS) points in the same direc- tion as the viewing direction, or -1 if they point in opposite directions. The following list summarizes the double-valued options that can be re- trieved with vpGetd. The result is always a single double and dptr should point to a single double location. VP_MIN_VOXEL_OPACITY Get the minimum opacity threshold (see vpSeti(3)). VP_DEPTH_CUE_FRONT Get the front depth cueing factor (see vpSetDepthCueing(3)). VP_DEPTH_CUE_DENSITY Get the depth cueing density (see vpSetDepthCueing(3)). VP_DEPTH_CUE_QUANTIZATION Get the depth cueing quantization (see vpSetDepthCueing(3)). VP_MAX_RAY_OPACITY Get the maximum opacity threshold (see vpSeti(3)). The following list summarizes the pointer-valued options that can be retrieved with vpGetp. Unless otherwise noted, the result is a single pointer and pptr should point to a single pointer location. VP_VOXEL_DATA Get a pointer to the 3D voxel array. VP_CLASSIFY_TABLES Get pointers to each of the lookup tables for the opacity trans- fer function. pptr must point to an array of pointers contain- ing one entry for each table (use VP_CLASSIFY_FIELD_COUNT to de- termine the number of tables, which is equal to the number of arguments to the opacity transfer function). VP_SHADE_FUNC Get the shading callback function (see vpSetLookupShader(3)). VP_SHADE_COLOR_TABLE Get a pointer to the shading lookup table for colors (see vpSet- LookupShader(3)). VP_SHADE_WEIGHT_TABLE Get a pointer to the shading lookup table for weights (see vpSetLookupShader(3)). VP_IMAGE Get a pointer to the output image array (see vpSetImage(3)). VP_LOG_ALLOC_FUNC Get a pointer to the memory allocator logging function (see vpSetCallback(3)). VP_LOG_FREE_FUNC Get a pointer to the memory deallocator logging function (see vpSetCallback(3)). VP_STATUS_FUNC Get a pointer to the status reporting function (see vpSetCall- back(3)). VP_READ_FUNC Get a pointer to the file I/O read function (see vpSetCall- back(3)). VP_WRITE_FUNC Get a pointer to the file I/O write function (see vpSetCall- back(3)). VP_MMAP_FUNC Get a pointer to the file I/O memory mapping function (see vpSetCallback(3)). VP_CLIENT_DATA Get a pointer to the client data (see vpSetClientData(3)). VP_SHADOW_COLOR_TABLE Get a pointer to the shading lookup table for shadowed color values (see vpSetShadowLookupShader(3)). ERRORS The normal return value is VP_OK. The following error return values are possible: VPERROR_BAD_OPTION The option argument is invalid. VPERROR_SINGULAR One of the current view transformation matrices is singular. (Only possible for options that depend on the current view transformation). SEE ALSO VolPack(3), vpCreateContext(3), vpSeti(3) VolPack vpGeti(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | ERRORS | SEE ALSO
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