03-30-2009
sizeof an array of structure without using 'sizeof' operator
Hi All,
is it possible to find out the size of an array of structures ( without using 'sizeof' operator). The condition is we have the array of structure instant but we are not aware of the elements inside the structure.
Can someone help me out?
Thanks in advance.
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LEARN ABOUT CENTOS
glgetuniformlocation
GLGETUNIFORMLOCATION(3G) OpenGL Manual GLGETUNIFORMLOCATION(3G)
NAME
glGetUniformLocation - Returns the location of a uniform variable
C SPECIFICATION
GLint glGetUniformLocation(GLuint program, const GLchar *name);
PARAMETERS
program
Specifies the program object to be queried.
name
Points to a null terminated string containing the name of the uniform variable whose location is to be queried.
DESCRIPTION
glGetUniformLocation returns an integer that represents the location of a specific uniform variable within a program object. name must be
a null terminated string that contains no white space. name must be an active uniform variable name in program that is not a structure, an
array of structures, or a subcomponent of a vector or a matrix. This function returns -1 if name does not correspond to an active uniform
variable in program, if name starts with the reserved prefix "gl_", or if name is associated with an atomic counter or a named uniform
block.
Uniform variables that are structures or arrays of structures may be queried by calling glGetUniformLocation for each field within the
structure. The array element operator "[]" and the structure field operator "." may be used in name in order to select elements within an
array or fields within a structure. The result of using these operators is not allowed to be another structure, an array of structures, or
a subcomponent of a vector or a matrix. Except if the last part of name indicates a uniform variable array, the location of the first
element of an array can be retrieved by using the name of the array, or by using the name appended by "[0]".
The actual locations assigned to uniform variables are not known until the program object is linked successfully. After linking has
occurred, the command glGetUniformLocation can be used to obtain the location of a uniform variable. This location value can then be passed
to glUniform() to set the value of the uniform variable or to glGetUniform() in order to query the current value of the uniform variable.
After a program object has been linked successfully, the index values for uniform variables remain fixed until the next link command
occurs. Uniform variable locations and values can only be queried after a link if the link was successful.
ERRORS
GL_INVALID_VALUE is generated if program is not a value generated by OpenGL.
GL_INVALID_OPERATION is generated if program is not a program object.
GL_INVALID_OPERATION is generated if program has not been successfully linked.
ASSOCIATED GETS
glGetActiveUniform() with arguments program and the index of an active uniform variable
glGetProgram() with arguments program and GL_ACTIVE_UNIFORMS or GL_ACTIVE_UNIFORM_MAX_LENGTH
glGetUniform() with arguments program and the name of a uniform variable
glIsProgram()
SEE ALSO
glLinkProgram(), glUniform()
COPYRIGHT
Copyright (C) 2003-2005 3Dlabs Inc. Ltd. (C) 2011 Khronos Group. This material may be distributed subject to the terms and conditions set
forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.
AUTHORS
opengl.org
opengl.org 06/10/2014 GLGETUNIFORMLOCATION(3G)