glprioritizetextures(3g) [centos man page]
GLPRIORITIZETEXTURES(3G) OpenGL Manual 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 texture. 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 texture. 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(), glBindTexture(), glCopyTexImage1D(), glCopyTexImage2D(), glTexImage1D(), glTexImage2D(), glTexImage3D(), glTexParameter() COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/. AUTHORS
opengl.org opengl.org 06/10/2014 GLPRIORITIZETEXTURES(3G)
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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)