glUniform1f(3G)
NAME
glUniform1f, glUniform2f, glUniform3f, glUniform4f, glUniform1i, glUniform2i, glUniform3i, glUniform4i, glUniform1ui, glUniform2ui, glUniform3ui, glUniform4ui, glUniform1fv, glUniform2fv, glUniform3fv, glUniform4fv, glUniform1iv, glUniform2iv, glUniform3iv, glUniform4iv, glUniform1uiv, glUniform2uiv, glUniform3uiv, glUniform4uiv, glUniformMatrix2fv, glUniformMatrix3fv, glUniformMatrix4fv, glUniformMatrix2x3fv, glUniformMatrix3x2fv, glUniformMatrix2x4fv, glUniformMatrix4x2fv, glUniformMatrix3x4fv, glUniformMatrix4x3fv - Specify the value of a uniform variable for the current program object
C SPECIFICATION
void glUniform1f(GLint location, GLfloat v0);
void glUniform2f(GLint location, GLfloat v0, GLfloat v1);
void glUniform3f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2);
void glUniform4f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2,
GLfloat v3);
void glUniform1i(GLint location, GLint v0);
void glUniform2i(GLint location, GLint v0, GLint v1);
void glUniform3i(GLint location, GLint v0, GLint v1, GLint v2);
void glUniform4i(GLint location, GLint v0, GLint v1, GLint v2,
GLint v3);
void glUniform1ui(GLint location, GLuint v0);
void glUniform2ui(GLint location, GLuint v0, GLuint v1);
void glUniform3ui(GLint location, GLuint v0, GLuint v1, GLuint v2);
void glUniform4ui(GLint location, GLuint v0, GLuint v1, GLuint v2,
GLuint v3);
void glUniform1fv(GLint location, GLsizei count, const GLfloat *value);
void glUniform2fv(GLint location, GLsizei count, const GLfloat *value);
void glUniform3fv(GLint location, GLsizei count, const GLfloat *value);
void glUniform4fv(GLint location, GLsizei count, const GLfloat *value);
void glUniform1iv(GLint location, GLsizei count, const GLint *value);
void glUniform2iv(GLint location, GLsizei count, const GLint *value);
void glUniform3iv(GLint location, GLsizei count, const GLint *value);
void glUniform4iv(GLint location, GLsizei count, const GLint *value);
void glUniform1uiv(GLint location, GLsizei count, const GLuint *value);
void glUniform2uiv(GLint location, GLsizei count, const GLuint *value);
void glUniform3uiv(GLint location, GLsizei count, const GLuint *value);
void glUniform4uiv(GLint location, GLsizei count, const GLuint *value);
void glUniformMatrix2fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
void glUniformMatrix3fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
void glUniformMatrix4fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
void glUniformMatrix2x3fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
void glUniformMatrix3x2fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
void glUniformMatrix2x4fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
void glUniformMatrix4x2fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
void glUniformMatrix3x4fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
void glUniformMatrix4x3fv(GLint location, GLsizei count,
GLboolean transpose, const GLfloat *value);
PARAMETERS
location
Specifies the location of the uniform variable to be modified.
count
For the vector (glUniform*v) commands, specifies the number of
elements that are to be modified. This should be 1 if the targeted
uniform variable is not an array, and 1 or more if it is an array.
For the matrix (glUniformMatrix*) commands, specifies the number of
matrices that are to be modified. This should be 1 if the targeted
uniform variable is not an array of matrices, and 1 or more if it
is an array of matrices.
transpose
For the matrix commands, specifies whether to transpose the matrix
as the values are loaded into the uniform variable.
v0, v1, v2, v3
For the scalar commands, specifies the new values to be used for
the specified uniform variable.
value
For the vector and matrix commands, specifies a pointer to an array
of count values that will be used to update the specified uniform
variable.
DESCRIPTION
glUniform modifies the value of a uniform variable or a uniform
variable array. The location of the uniform variable to be modified is
specified by location, which should be a value returned by
glGetUniformLocation(). glUniform operates on the program object that
was made part of current state by calling glUseProgram().
The commands glUniform{1|2|3|4}{f|i|ui} are used to change the value of
the uniform variable specified by location using the values passed as
arguments. The number specified in the command should match the number
of components in the data type of the specified uniform variable (e.g.,
1 for float, int, unsigned int, bool; 2 for vec2, ivec2, uvec2, bvec2,
etc.). The suffix f indicates that floating-point values are being
passed; the suffix i indicates that integer values are being passed;
the suffix ui indicates that unsigned integer values are being passed,
and this type should also match the data type of the specified uniform
variable. The i variants of this function should be used to provide
values for uniform variables defined as int, ivec2, ivec3, ivec4, or
arrays of these. The ui variants of this function should be used to
provide values for uniform variables defined as unsigned int, uvec2,
uvec3, uvec4, or arrays of these. The f variants should be used to
provide values for uniform variables of type float, vec2, vec3, vec4,
or arrays of these. Either the i, ui or f variants may be used to
provide values for uniform variables of type bool, bvec2, bvec3, bvec4,
or arrays of these. The uniform variable will be set to false if the
input value is 0 or 0.0f, and it will be set to true otherwise.
All active uniform variables defined in a program object are
initialized to 0 when the program object is linked successfully. They
retain the values assigned to them by a call to glUniform until the
next successful link operation occurs on the program object, when they
are once again initialized to 0.
The commands glUniform{1|2|3|4}{f|i|ui}v can be used to modify a single
uniform variable or a uniform variable array. These commands pass a
count and a pointer to the values to be loaded into a uniform variable
or a uniform variable array. A count of 1 should be used if modifying
the value of a single uniform variable, and a count of 1 or greater can
be used to modify an entire array or part of an array. When loading n
elements starting at an arbitrary position m in a uniform variable
array, elements m + n - 1 in the array will be replaced with the new
values. If m + n - 1 is larger than the size of the uniform variable
array, values for all array elements beyond the end of the array will
be ignored. The number specified in the name of the command indicates
the number of components for each element in value, and it should match
the number of components in the data type of the specified uniform
variable (e.g., 1 for float, int, bool; 2 for vec2, ivec2, bvec2,
etc.). The data type specified in the name of the command must match
the data type for the specified uniform variable as described
previously for glUniform{1|2|3|4}{f|i|ui}.
For uniform variable arrays, each element of the array is considered to
be of the type indicated in the name of the command (e.g., glUniform3f
or glUniform3fv can be used to load a uniform variable array of type
vec3). The number of elements of the uniform variable array to be
modified is specified by count
The commands glUniformMatrix{2|3|4|2x3|3x2|2x4|4x2|3x4|4x3}fv are used
to modify a matrix or an array of matrices. The numbers in the command
name are interpreted as the dimensionality of the matrix. The number 2
indicates a 2 2 matrix (i.e., 4 values), the number 3 indicates a 3
3 matrix (i.e., 9 values), and the number 4 indicates a 4 4 matrix
(i.e., 16 values). Non-square matrix dimensionality is explicit, with
the first number representing the number of columns and the second
number representing the number of rows. For example, 2x4 indicates a 2
4 matrix with 2 columns and 4 rows (i.e., 8 values). If transpose is
GL_FALSE, each matrix is assumed to be supplied in column major order.
If transpose is GL_TRUE, each matrix is assumed to be supplied in row
major order. The count argument indicates the number of matrices to be
passed. A count of 1 should be used if modifying the value of a single
matrix, and a count greater than 1 can be used to modify an array of
matrices.
NOTES
glUniform1i and glUniform1iv are the only two functions that may be used to load uniform variables defined as sampler types. Loading samplers with any other function will result in a GL_INVALID_OPERATION error. If count is greater than 1 and the indicated uniform variable is not an array, a GL_INVALID_OPERATION error is generated and the specified uniform variable will remain unchanged. Other than the preceding exceptions, if the type and size of the uniform variable as defined in the shader do not match the type and size specified in the name of the command used to load its value, a GL_INVALID_OPERATION error will be generated and the specified uniform variable will remain unchanged. If location is a value other than -1 and it does not represent a valid uniform variable location in the current program object, an error will be generated, and no changes will be made to the uniform variable storage of the current program object. If location is equal to -1, the data passed in will be silently ignored and the specified uniform variable will not be changed.
ERRORS
GL_INVALID_OPERATION is generated if there is no current program object. GL_INVALID_OPERATION is generated if the size of the uniform variable declared in the shader does not match the size indicated by the glUniform command. GL_INVALID_OPERATION is generated if one of the signed or unsigned integer variants of this function is used to load a uniform variable of type float, vec2, vec3, vec4, or an array of these, or if one of the floating-point variants of this function is used to load a uniform variable of type int, ivec2, ivec3, ivec4, unsigned int, uvec2, uvec3, uvec4, or an array of these. GL_INVALID_OPERATION is generated if one of the signed integer variants of this function is used to load a uniform variable of type unsigned int, uvec2, uvec3, uvec4, or an array of these. GL_INVALID_OPERATION is generated if one of the unsigned integer variants of this function is used to load a uniform variable of type int, ivec2, ivec3, ivec4, or an array of these. GL_INVALID_OPERATION is generated if location is an invalid uniform location for the current program object and location is not equal to -1. GL_INVALID_VALUE is generated if count is less than 0. GL_INVALID_OPERATION is generated if count is greater than 1 and the indicated uniform variable is not an array variable. GL_INVALID_OPERATION is generated if a sampler is loaded using a command other than glUniform1i and glUniform1iv.
ASSOCIATED GETS
glGet() with the argument GL_CURRENT_PROGRAM glGetActiveUniform() with the handle of a program object and the index of an active uniform variable glGetUniform() with the handle of a program object and the location of a uniform variable glGetUniformLocation() with the handle of a program object and the name of a uniform variable
VERSION SUPPORT
OpenGL Version
Function 2.0 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5
/
Feature
Name
glUniform1f
glUniform1fv
glUniform1i
glUniform1iv
glUniform1ui - -
glUniform1uiv - -
glUniform2f
glUniform2fv
glUniform2i
glUniform2iv
glUniform2ui - -
glUniform2uiv - -
glUniform3f
glUniform3fv
glUniform3i
glUniform3iv
glUniform3ui - -
glUniform3uiv - -
glUniform4f
glUniform4fv
glUniform4i
glUniform4iv
glUniform4ui - -
glUniform4uiv - -
glUniformMatrix2fv
glUniformMatrix2x3fv -
glUniformMatrix2x4fv -
glUniformMatrix3fv
glUniformMatrix3x2fv -
glUniformMatrix3x4fv -
glUniformMatrix4fv
glUniformMatrix4x2fv -
glUniformMatrix4x3fv -
SEE ALSO
glLinkProgram(), glUseProgram()
COPYRIGHT
Copyright 2003-2005 3Dlabs Inc. Ltd. Copyright 2010-2014 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/.
COPYRIGHT
Copyright 2003-2005 3Dlabs Inc. Ltd. Copyright 2010-2014 Khronos Group [FIXME: source] 07/22/2015 GLUNIFORM(3G)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
