clCreateFromGLTexture3D

Creates an OpenCL 3D image object from an OpenGL 3D texture object.

cl_mem clCreateFromGLTexture3D ( cl_context context,
  cl_mem_flags flags,
  GLenum texture_target,
  GLint miplevel,
  GLuint texture,
  cl_int * errcode_ret)

Parameters

context

A valid OpenCL context created from an OpenGL 3D context.

flags

A bit-field that is used to specify usage information. Refer to the table at clCreateBuffer for a description of flags. Only the valuesCL_MEM_READ_ONLY, CL_MEM_WRITE_ONLY and CL_MEM_READ_WRITE can be used.

texture_target

texture_target is used only to define the image type of texture. Must be GL_TEXTURE_3D. No reference to a bound GL texture object is made or implied by this parameter.

miplevel

The mipmap level to be used.

texture

The name of a GL 3D texture object. The texture object must be a complete texture as per OpenGL rules on texture completeness. The texture format and dimensions defined by OpenGL for the specified miplevel of the texture will be used to create the 3D image object. Only GL texture objects with an internal format that maps to appropriate image channel order and data type specified in the table of supported Image Channel Order Values and the table of supported Image Channel Data Types at cl_image_format can be used to create the 3D image object.

errcode_ret

Returns an appropriate error code as described below. If errcode_ret is NULL, no error code is returned.

Description

If the state of a GL texture object is modified through the GL API (e.g. the OpenGL functions glTexImage2D or glTexImage3D, or the values of the texture parameters GL_TEXTURE_BASE_LEVEL or GL_TEXTURE_MAX_LEVEL are modified) while there exists a corresponding CL image object, subsequent use of the CL image object will result in undefined behavior.

The clRetainMemObject and clReleaseMemObject functions can be used to retain and release the image objects.

Notes

OpenCL 1.0 supports read-only 3D image memory objects. Writes to 3D image objects that are GL 3D textures are supported if the OpenCL implementation supports the cl_khr_3d_image_writes extension. 3D images are optional in the embedded profile. If 3D images are not supported by the OpenCL embedded profile, the errcode_ret argument to clCreateFromGLTexture3D will return CL_INVALID_OPERATION.

Errors

Returns a valid non-zero OpenCL image object and errcode_ret is set to CL_SUCCESS if the image object is created successfully. Otherwise, it returns a NULL value with one of the following error values returned in errcode_ret:

  • CL_INVALID_CONTEXT if context is not a valid context or was not created from a GL context. .
  • CL_INVALID_VALUE if values specified in flags are not valid or if value specified in texture_target is not one of the values specified in the description of texture_target.
  • CL_INVALID_MIPLEVEL if miplevel is less than the value of levelbase (for OpenGL implementations) or zero (for OpenGL ES implementations); or greater than the value of q (for both OpenGL and OpenGL ES). levelbase and q are defined for the texture in section 3.8.10 (Texture Completeness) of the OpenGL 2.1 specification and section 3.7.10 of the OpenGL ES 2.0.
  • CL_INVALID_MIPLEVEL if miplevel is greater than zero and the OpenGL implementation does not support creating from non-zero mipmap levels.
  • CL_INVALID_GL_OBJECT if texture is not a GL texture object whose type matches texture_target, if the specified miplevel of texture is not defined, or if the width or height of the specified miplevel is zero.
  • CL_INVALID_IMAGE_FORMAT_DESCRIPTOR if the OpenGL texture internal format does not map to a supported OpenCL image format.
  • CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.

Specification

OpenCL Specification

Also see

clCreateBuffer, clCreateFromGLTexture2D

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