Index for Section 3G

Alphabetical listing for G

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glAreTexturesResident(3G)
NAME
  glAreTexturesResident - determine if textures are loaded in texture memory

SYNOPSIS
  GLboolean glAreTexturesResident(
	  GLsizei n,
	  const GLuint *textures,
	  GLboolean *residences );

PARAMETERS
  n   Specifies the number of textures to be queried.

  textures
      Specifies an array containing the names of the textures to be queried.

  residences
      Specifies an array in which the texture residence status is returned.
      The residence status of a texture named by an element of textures is
      returned in the corresponding element of residences.

DESCRIPTION
  GL establishes a ``working set'' of textures that are resident in texture
  memory. These textures can be bound to a texture target much more
  efficiently than textures that are not resident.

  glAreTexturesResident() queries the texture residence status of the n
  textures named by the elements of textures. If all the named textures are
  resident, glAreTexturesResident() returns GL_TRUE, and the contents of
  residences are undisturbed. If not all the named textures are resident,
  glAreTexturesResident() returns GL_FALSE, and detailed status is returned
  in the n elements of residences. If an element of residences is GL_TRUE,
  then the texture named by the corresponding element of textures is
  resident.

  The residence status of a single bound texture may also be queried by
  calling glGetTexParameter() with the target argument set to the target to
  which the texture is bound, and the pname argument set to
  GL_TEXTURE_RESIDENT. This is the only way that the residence status of a
  default texture can be queried.

NOTES
  glAreTexturesResident() is available only if the GL version is 1.1 or
  greater.

  glAreTexturesResident() returns the residency status of the textures at the
  time of invocation. It does not guarantee that the textures will remain
  resident at any other time.

  If textures reside in virtual memory (there is no texture memory), they are
  considered always resident.

  Some implementations may not load a texture until the first use of that
  texture.

ERRORS
  GL_INVALID_VALUE is generated if n is negative.

  GL_INVALID_VALUE is generated if any element in textures is 0 or does not
  name a texture. In that case, the function returns GL_FALSE and the
  contents of residences is indeterminate.

  GL_INVALID_OPERATION is generated if glAreTexturesResident() is executed
  between the execution of glBegin() and the corresponding execution of
  glEnd().

ASSOCIATED GETS
  glGetTexParameter() with parameter name GL_TEXTURE_RESIDENT retrieves the
  residence status of a currently bound texture.

SEE ALSO
  glBindTexture(3), glGetTexParameter(3), glPrioritizeTextures(3),
  glTexImage1D(3), glTexImage2D(3), glTexImage3D(3), glTexParameter(3)

Index for Section 3G

Alphabetical listing for G

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