73 lines
No EOL
3.5 KiB
C++
73 lines
No EOL
3.5 KiB
C++
#pragma once
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#include <cgv/data/lib_begin.h>
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namespace cgv {
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namespace data {
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/** the packing_info class stores information about packed integers
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structures. It is typically used to define packed component formats.
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The stored information includes, whether packing is used,
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the alignment of the components and bit depths of up to 4 components.
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The aligment is an integer defining a multiple to which the components
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are aligned. If the alignment is 1, the components are packed densely.
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If it is for example 8, the components are stored at starting at
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locations that are multiples of 8. For example if the components have
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bit depth 6 and the alignment is 8, then the first component is stored
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starting with the first bit, the second component starting with the 8th
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bit and so on. In case no packing is used the alignment is measured in
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bytes. The bit depths and alignment are stored as unsigned integers
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with 6 bits, i.e. the maximum value is 63.
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*/
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class CGV_API packing_info
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{
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protected:
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bool is_packed : 1;
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unsigned int bd0 : 6;
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unsigned int bd1 : 6;
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unsigned int bd2 : 6;
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unsigned int bd3 : 6;
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unsigned int ca : 6;
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///
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bool prepare_bit_operation(unsigned int ci, void* ptr, unsigned int &off, unsigned int &bd, unsigned int* &iptr) const;
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bool prepare_bit_operation(unsigned int ci, const void* ptr, unsigned int &off, unsigned int &bd, const unsigned int* &iptr) const;
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unsigned int get_bit_offset(unsigned int ci) const;
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public:
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/** construct packing information from alignment and bit depths. If no bit depths are given, the components are not
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packed and the alignment is in bytes. If one or more depths are specified, the alignment is in bits. If exactly
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one depth is given, all component bit depths are set to this bit depth */
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packing_info(unsigned int align = 1, unsigned int d0 = 0, unsigned int d1 = 0, unsigned int d2 = 0, unsigned int d3 = 0);
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/// clear packing info information
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void clear();
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/// return the bit depth of the ci-th component
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unsigned int get_bit_depth(unsigned int ci) const;
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/// set the bit depth of the ci-th component
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void set_bit_depth(unsigned int ci, unsigned int depth);
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/// return whether packing is enabled
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bool is_packing() const;
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/// set the packing flag
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void set_packing(bool enable = true);
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/// return the component alignment in bits in the packed case and in bytes in the unpacked case
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unsigned int get_component_alignment() const;
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/// set the component alignment in bits in the packed case and in bytes in the unpacked case
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void set_component_alignment(unsigned int a);
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/// return the next integer larger or equal to v which is dividable by a
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static unsigned int align(unsigned int v, unsigned int a);
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/// return the ci-th component of the data entry pointed to by the given pointer of a signed packed component
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int get_signed(unsigned int ci, const void* ptr) const;
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/// return the ci-th component of the data entry pointed to by the given pointer of an unsigned packed component
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unsigned int get_unsigned(unsigned int ci, const void* ptr) const;
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/// set the ci-th component of the data entry pointed to by the given pointer of a signed packed component
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bool set_signed(unsigned int ci, void* ptr, int v) const;
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/// set the ci-th component of the data entry pointed to by the given pointer of an unsigned packed component
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bool set_unsigned(unsigned int ci, void* ptr, unsigned int v) const;
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/// equal comparison
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bool operator == (const packing_info& pi) const;
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/// unequal comparison
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bool operator != (const packing_info& pi) const;
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};
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}
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}
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#include <cgv/config/lib_end.h> |