glprioritizetextures(3g) [suse man page]

GLPRIORITIZETEXTURES(3G)												  GLPRIORITIZETEXTURES(3G)

NAME

       glPrioritizeTextures - set texture residence priority

C SPECIFICATION

       void glPrioritizeTextures( GLsizei n,
				  const GLuint *textures,
				  const GLclampf *priorities )

PARAMETERS

       n	   Specifies the number of textures to be prioritized.

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

       priorities  Specifies  an  array  containing  the  texture priorities.  A priority given in an element of priorities applies to the texture
		   named by the corresponding element of textures.

DESCRIPTION

       glPrioritizeTextures assigns the n texture priorities given in priorities to the n textures named in textures.

       The GL establishes a ``working set'' of textures that are resident in texture memory.  These textures may be bound to a texture target much
       more  efficiently than textures that are not resident.  By specifying a priority for each texture, glPrioritizeTextures allows applications
       to guide the GL implementation in determining which textures should be resident.

       The priorities given in priorities are clamped to the range [0,1] before they are assigned.  0 indicates the lowest priority; textures with
       priority  0  are  least	likely to be resident.	1 indicates the highest priority; textures with priority 1 are most likely to be resident.
       However, textures are not guaranteed to be resident until they are used.

       glPrioritizeTextures silently ignores attempts to prioritize texture 0, or any texture name that does not correspond to	an  existing  tex-
       ture.

       glPrioritizeTextures  does not require that any of the textures named by textures be bound to a texture target.	glTexParameter may also be
       used to set a texture's priority, but only if the texture is currently bound.  This is the only way to set the priority of a  default  tex-
       ture.

NOTES

       glPrioritizeTextures is available only if the GL version is 1.1 or greater.

ERRORS

       GL_INVALID_VALUE is generated if n is negative.

       GL_INVALID_OPERATION  is  generated if glPrioritizeTextures is executed between the execution of glBegin and the corresponding execution of
       glEnd.

ASSOCIATED GETS

       glGetTexParameter with parameter name GL_TEXTURE_PRIORITY retrieves the priority of a currently bound texture.

SEE ALSO

       glAreTexturesResident(3G),   glBindTexture(3G),	  glCopyTexImage1D(3G),    glCopyTexImage2D(3G),    glTexImage1D(3G),	 glTexImage2D(3G),
       glTexImage3D(3G), glTexParameter(3G)

															  GLPRIORITIZETEXTURES(3G)

GLARETEXTURESRESIDENT(3G)												 GLARETEXTURESRESIDENT(3G)

NAME

       glAreTexturesResident - determine if textures are loaded in texture memory

C SPECIFICATION

       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 resi-
       dences 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(3G),     glGetTexParameter(3G),	 glPrioritizeTextures(3G),     glTexImage1D(3G),    glTexImage2D(3G),	 glTexImage3D(3G),
       glTexParameter(3G)

															 GLARETEXTURESRESIDENT(3G)