Class ARBTextureView
This extension allows a texture's data store to be "viewed" in multiple ways, either reinterpreting the data format/type as a different format/type with the same element size, or by clamping the mipmap level range or array slice range.
The goals of this extension are to avoid having these alternate views become shared mutable containers of shared mutable objects, and to add the views to the API in a minimally invasive way.
No new object types are added. Conceptually, a texture object is split into the following parts:
- A data store holding texel data.
- State describing which portions of the data store to use, and how to interpret the data elements.
- An embedded sampler object.
- Various other texture parameters.
With this extension, multiple textures can share a data store and have different state describing which portions of the data store to use and how to interpret the data elements. The data store is refcounted and not destroyed until the last texture sharing it is deleted.
This extension leverages the ARB_texture_storage
concept of an "immutable texture". Views can only be created of textures created with TexStorage.
Requires OpenGL 4.2
or ARB_texture_storage
. Promoted to core in OpenGL 4.3
.
-
Field Summary
Modifier and TypeFieldDescriptionstatic final int
Accepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.static final int
Accepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.static final int
Accepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.static final int
Accepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.static final int
Accepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv. -
Method Summary
Modifier and TypeMethodDescriptionstatic void
glTextureView
(int texture, int target, int origtexture, int internalformat, int minlevel, int numlevels, int minlayer, int numlayers) Initializes a texture as a data alias of another texture's data store.
-
Field Details
-
GL_TEXTURE_VIEW_MIN_LEVEL
public static final int GL_TEXTURE_VIEW_MIN_LEVELAccepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.- See Also:
-
GL_TEXTURE_VIEW_NUM_LEVELS
public static final int GL_TEXTURE_VIEW_NUM_LEVELSAccepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.- See Also:
-
GL_TEXTURE_VIEW_MIN_LAYER
public static final int GL_TEXTURE_VIEW_MIN_LAYERAccepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.- See Also:
-
GL_TEXTURE_VIEW_NUM_LAYERS
public static final int GL_TEXTURE_VIEW_NUM_LAYERSAccepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.- See Also:
-
GL_TEXTURE_IMMUTABLE_LEVELS
public static final int GL_TEXTURE_IMMUTABLE_LEVELSAccepted by thepname
parameters of GetTexParameterfv and GetTexParameteriv.- See Also:
-
-
Method Details
-
glTextureView
public static void glTextureView(int texture, int target, int origtexture, int internalformat, int minlevel, int numlevels, int minlayer, int numlayers) Initializes a texture as a data alias of another texture's data store.- Parameters:
texture
- the texture object to be initialized as a viewtarget
- the target to be used for the newly initialized textureorigtexture
- the name of a texture object of which to make a viewinternalformat
- the internal format for the newly created viewminlevel
- the lowest level of detail of the viewnumlevels
- the number of levels of detail to include in the viewminlayer
- the index of the first layer to include in the viewnumlayers
- the number of layers to include in the view
-