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glBindImageTexture

Name

glBindImageTexture — bind a level of a texture to an image unit

C Specification

void glBindImageTexture( GLuint unit,
  GLuint texture,
  GLint level,
  GLboolean layered,
  GLint layer,
  GLenum access,
  GLenum format);
 

Parameters

unit

Specifies the index of the image unit to which to bind the texture

texture

Specifies the name of the texture to bind to the image unit.

level

Specifies the level of the texture that is to be bound.

layered

Specifies whether a layered texture binding is to be established.

layer

If layered is GL_FALSE, specifies the layer of texture to be bound to the image unit. Ignored otherwise.

access

Specifies a token indicating the type of access that will be performed on the image.

format

Specifies the format that the elements of the image will be treated as for the purposes of formatted loads and stores.

Description

glBindImageTexture binds a single level of a texture to an image unit for the purpose of reading and writing it from shaders. unit specifies the zero-based index of the image unit to which to bind the texture level. texture specifies the name of an existing texture object to bind to the image unit. If texture is zero, then any existing binding to the image unit is broken. level specifies the level of the texture to bind to the image unit.

If texture is the name of a two-dimensional array texture, a cube map texture, or a two-dimensional multisample array texture, then it is possible to bind either the entire array, or only a single layer of the array to the image unit. In such cases, if layered is GL_TRUE, the entire array is attached to the image unit and layer is ignored. However, if layered is GL_FALSE then layer specifies the layer of the array to attach to the image unit.

access specifies the access types to be performed by shaders and may be set to GL_READ_ONLY, GL_WRITE_ONLY, or GL_READ_WRITE to indicate read-only, write-only or read-write access, respectively. Violation of the access type specified in access (for example, if a shader writes to an image bound with access set to GL_READ_ONLY) will lead to undefined results, possibly including program termination.

format specifies the format that is to be used when performing formatted loads and stores into the image from shaders. format must be compatible with the texture's internal format and must be one of the formats listed in the following table.

Table 1. Internal Image Formats
Image Unit Format Format Qualifier
GL_RGBA32F rgba32f
GL_RGBA16F rgba16f
GL_R32F r32f
GL_RGBA32UI rgba32ui
GL_RGBA16UI rgba16ui
GL_RGBA8UI rgba8ui
GL_R32UI r32ui
GL_RGBA32I rgba32i
GL_RGBA16I rgba16i
GL_RGBA8I rgba8i
GL_R32I r32i
GL_RGBA8 rgba8
GL_RGBA8_SNORM rgba8_snorm


When a texture is bound to an image unit, the format parameter for the image unit need not exactly match the texture internal format as long as the formats are considered compatible as defined in the OpenGL ES Specification. The matching criterion used for a given texture may be determined by calling glGetTexParameter with value set to GL_IMAGE_FORMAT_COMPATIBILITY_TYPE, with return values of GL_IMAGE_FORMAT_COMPATIBILITY_BY_SIZE and GL_IMAGE_FORMAT_COMPATIBILITY_BY_CLASS, specifying matches by size and class, respectively.

Notes

The glBindImageTexture can only be used with immutable textures. This is intended to guide developers towards immutable textures.

Errors

GL_INVALID_VALUE is generated if unit greater than or equal to the value of GL_MAX_IMAGE_UNITS.

GL_INVALID_VALUE is generated if texture is not the name of an existing texture object.

GL_INVALID_OPERATION is generated if texture is the name of an immutable texture object.

GL_INVALID_VALUE is generated if level or layer is less than zero.

GL_INVALID_ENUM is generated if access or format is not one of the supported tokens.

Associated Gets

glGet with argument GL_IMAGE_BINDING_NAME.

glGet with argument GL_IMAGE_BINDING_LEVEL.

glGet with argument GL_IMAGE_BINDING_LAYERED.

glGet with argument GL_IMAGE_BINDING_LAYER.

glGet with argument GL_IMAGE_BINDING_ACCESS.

glGet with argument GL_IMAGE_BINDING_FORMAT.

API Version Support

OpenGL ES API Version
Function Name 2.0 3.0 3.1
glBindImageTexture - -
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