RenderScript Object Characteristics Functions (original) (raw)
Overview
The functions below can be used to query the characteristics of an Allocation, Element, or Sampler object. These objects are created from Java. You can't create them from a script.
Allocations:
Allocations are the primary method used to pass data to and from RenderScript kernels.
They are a structured collection of cells that can be used to store bitmaps, textures, arbitrary data points, etc.
This collection of cells may have many dimensions (X, Y, Z, Array0, Array1, Array2, Array3), faces (for cubemaps), and level of details (for mipmapping).
See the android.renderscript.Allocation for details on to create Allocations.
Elements:
The term "element" is used a bit ambiguously in RenderScript, as both type information for the cells of an Allocation and the instantiation of that type. For example:
- rs_element is a handle to a type specification, and
- In functions like rsGetElementAt(), "element" means the instantiation of the type, i.e. a cell of an Allocation.
The functions below let you query the characteristics of the type specification.
An Element can specify a simple data types as found in C, e.g. an integer, float, or boolean. It can also specify a handle to a RenderScript object. See rs_data_type for a list of basic types.
Elements can specify fixed size vector (of size 2, 3, or 4) versions of the basic types. Elements can be grouped together into complex Elements, creating the equivalent of C structure definitions.
Elements can also have a kind, which is semantic information used to interpret pixel data. See rs_data_kind.
When creating Allocations of common elements, you can simply use one of the many predefined Elements like F32_2.
To create complex Elements, use the Element.Builder Java class.
Samplers:
Samplers objects define how Allocations can be read as structure within a kernel. See android.renderscript.S.
Summary
| Functions | |
|---|---|
| rsAllocationGetDimFaces | Presence of more than one face |
| rsAllocationGetDimLOD | Presence of levels of detail |
| rsAllocationGetDimX | Size of the X dimension |
| rsAllocationGetDimY | Size of the Y dimension |
| rsAllocationGetDimZ | Size of the Z dimension |
| rsAllocationGetElement | Get the object that describes the cell of an Allocation |
| rsClearObject | Release an object |
| rsElementGetBytesSize | Size of an Element |
| rsElementGetDataKind | Kind of an Element |
| rsElementGetDataType | Data type of an Element |
| rsElementGetSubElement | Sub-element of a complex Element |
| rsElementGetSubElementArraySize | Array size of a sub-element of a complex Element |
| rsElementGetSubElementCount | Number of sub-elements |
| rsElementGetSubElementName | Name of a sub-element |
| rsElementGetSubElementNameLength | Length of the name of a sub-element |
| rsElementGetSubElementOffsetBytes | Offset of the instantiated sub-element |
| rsElementGetVectorSize | Vector size of the Element |
| rsIsObject | Check for an empty handle |
| rsSamplerGetAnisotropy | Anisotropy of the Sampler |
| rsSamplerGetMagnification | Sampler magnification value |
| rsSamplerGetMinification | Sampler minification value |
| rsSamplerGetWrapS | Sampler wrap S value |
| rsSamplerGetWrapT | Sampler wrap T value |
| Deprecated Functions | |
|---|---|
| rsGetAllocation | Deprecated. Return the Allocation for a given pointer |
rsAllocationGetDimFaces : Presence of more than one face
Returns
Returns 1 if more than one face is present, 0 otherwise.
If the Allocation is a cubemap, this function returns 1 if there's more than one face present. In all other cases, it returns 0.
Use rsGetDimHasFaces() to get the dimension of a currently running kernel.
rsAllocationGetDimLOD : Presence of levels of detail
Returns
Returns 1 if more than one LOD is present, 0 otherwise.
Query an Allocation for the presence of more than one Level Of Detail. This is useful for mipmaps.
Use rsGetDimLod() to get the dimension of a currently running kernel.
rsAllocationGetDimX : Size of the X dimension
Returns
X dimension of the Allocation.
Returns the size of the X dimension of the Allocation.
Use rsGetDimX() to get the dimension of a currently running kernel.
rsAllocationGetDimY : Size of the Y dimension
Returns
Y dimension of the Allocation.
Returns the size of the Y dimension of the Allocation. If the Allocation has less than two dimensions, returns 0.
Use rsGetDimY() to get the dimension of a currently running kernel.
rsAllocationGetDimZ : Size of the Z dimension
Returns
Z dimension of the Allocation.
Returns the size of the Z dimension of the Allocation. If the Allocation has less than three dimensions, returns 0.
Use rsGetDimZ() to get the dimension of a currently running kernel.
rsAllocationGetElement : Get the object that describes the cell of an Allocation
Parameters
| a | Allocation to get data from. |
|---|
Returns
Element describing Allocation layout.
Get the Element object describing the type, kind, and other characteristics of a cell of an Allocation. See the rsElement* functions below.
rsClearObject : Release an object
Tells the run time that this handle will no longer be used to access the related object. If this was the last handle to that object, resource recovery may happen.
After calling this function, *dst will be set to an empty handle. See rsIsObject().
rsElementGetBytesSize : Size of an Element
Returns the size in bytes that an instantiation of this Element will occupy.
rsElementGetDataKind : Kind of an Element
Returns the Element's data kind. This is used to interpret pixel data.
See rs_data_kind.
rsElementGetDataType : Data type of an Element
Returns the Element's base data type. This can be a type similar to C/C++ (e.g. RS_TYPE_UNSIGNED_8), a handle (e.g. RS_TYPE_ALLOCATION and RS_TYPE_ELEMENT), or a more complex numerical type (e.g. RS_TYPE_UNSIGNED_5_6_5 and RS_TYPE_MATRIX_4X4). See rs_data_type.
If the Element describes a vector, this function returns the data type of one of its items. Use rsElementGetVectorSize to get the size of the vector.
If the Element describes a structure, RS_TYPE_NONE is returned. Use the rsElementGetSub* functions to explore this complex Element.
rsElementGetSubElement : Sub-element of a complex Element
Parameters
| e | Element to query. |
|---|---|
| index | Index of the sub-element to return. |
Returns
Sub-element at the given index.
For Elements that represents a structure, this function returns the sub-element at the specified index.
If the Element is not a structure or the index is greater or equal to the number of sub-elements, an invalid handle is returned.
rsElementGetSubElementArraySize : Array size of a sub-element of a complex Element
Parameters
| e | Element to query. |
|---|---|
| index | Index of the sub-element. |
Returns
Array size of the sub-element.
For complex Elements, sub-elements can be statically sized arrays. This function returns the array size of the sub-element at the index. This sub-element repetition is different than fixed size vectors.
rsElementGetSubElementCount : Number of sub-elements
Parameters
| e | Element to get data from. |
|---|
Returns
Elements can be simple, such as an int or a float, or a structure with multiple sub-elements. This function returns zero for simple Elements and the number of sub-elements for complex Elements.
rsElementGetSubElementName : Name of a sub-element
Parameters
| e | Element to get data from. |
|---|---|
| index | Index of the sub-element. |
| name | Address of the array to store the name into. |
| nameLength | Length of the provided name array. |
Returns
Number of characters copied, excluding the null terminator.
For complex Elements, this function returns the name of the sub-element at the specified index.
rsElementGetSubElementNameLength : Length of the name of a sub-element
Parameters
| e | Element to get data from. |
|---|---|
| index | Index of the sub-element. |
Returns
Length of the sub-element name including the null terminator.
For complex Elements, this function returns the length of the name of the sub-element at the specified index.
rsElementGetSubElementOffsetBytes : Offset of the instantiated sub-element
Parameters
| e | Element to get data from. |
|---|---|
| index | Index of the sub-element. |
Returns
This function returns the relative position of the instantiation of the specified sub-element within the instantiation of the Element.
For example, if the Element describes a 32 bit float followed by a 32 bit integer, the offset return for the first will be 0 and the second 4.
rsElementGetVectorSize : Vector size of the Element
Parameters
| e | Element to get data from. |
|---|
Returns
Length of the element vector.
Returns the Element's vector size. If the Element does not represent a vector, 1 is returned.
rsGetAllocation : Return the Allocation for a given pointer
Deprecated. This function is deprecated and will be removed from the SDK in a future release.
Returns the Allocation for a given pointer. The pointer should point within a valid allocation. The results are undefined if the pointer is not from a valid Allocation.
rsIsObject : Check for an empty handle
Returns true if the handle contains a non-null reference.
This function does not validate that the internal pointer used in the handle points to an actual valid object; it only checks for null.
This function can be used to check the Element returned by rsElementGetSubElement() or see if rsClearObject() has been called on a handle.