glGetActiveAtomicCounterBufferiv - OpenGL 4 Reference Pages

Name

glGetActiveAtomicCounterBufferiv — retrieve information about the set of active atomic counter buffers for a program

C Specification

`void glGetActiveAtomicCounterBufferiv(`	Gluint	`program`,
	GLuint	`bufferIndex`,
	GLenum	`pname`,
	GLint *	`params)`;

Parameters

program: The name of a program object from which to retrieve information.
bufferIndex: Specifies index of an active atomic counter buffer.
pname: Specifies which parameter of the atomic counter buffer to retrieve.
params: Specifies the address of a variable into which to write the retrieved information.

Description

glGetActiveAtomicCounterBufferiv retrieves information about the set of active atomic counter buffers for a program object. program is the name of a program object for which the command glLinkProgram has been issued in the past. It is not necessary for program to have been linked successfully. The link may have failed because the number of active atomic counters exceeded the limits.

bufferIndex specifies the index of an active atomic counter buffer and must be in the range zero to the value of GL_ACTIVE_ATOMIC_COUNTER_BUFFERS minus one. The value of GL_ACTIVE_ATOMIC_COUNTER_BUFFERS for program indicates the number of active atomic counter buffer and can be queried with glGetProgram.

If no error occurs, the parameter(s) specified by pname are returned in params. If an error is generated, the contents of params are not modified.

If pname is GL_ATOMIC_COUNTER_BUFFER_BINDING, then the index of the counter buffer binding point associated with the active atomic counter buffer bufferIndex for program is returned.

If pname is GL_ATOMIC_COUNTER_BUFFER_DATA_SIZE, then the implementation-dependent minimum total buffer object size, in baseic machine units, required to hold all active atomic counters in the atomic counter binding point identified by bufferIndex is returned.

If pname is GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS, then the number of active atomic counters for the atomic counter buffer identified by bufferIndex is returned.

If pname is GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTER_INDICES, then a list of the active atomic counter indices for the atomic counter buffer identified by bufferIndex is returned. The number of elements that will be written into params is the value of GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS for bufferIndex.

If pname is GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_VERTEX_SHADER, GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_CONTROL_SHADER, GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_EVALUATION_SHADER, GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_GEOMETRY_SHADER, GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_FRAGMENT_SHADER, GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER then a boolean value indicating whether the atomic counter buffer identified by bufferIndex is referenced by the vertex, tessellation control, tessellation evaluation, geometry, fragment or compute processing stages of program, respectively, is returned.

Notes

glGetActiveAtomicCounterBufferiv is available only if the GL version is 4.2 or higher.

GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER is available only of the GL version is 4.3 or higher.

Errors

GL_INVALID_VALUE is generated if program is not the name of a program object for which glLinkProgram has been called in the past.

GL_INVALID_VALUE is generated if bufferIndex is greater than or equal to the value of GL_ACTIVE_ATOMIC_COUNTER_BUFFERS for program.

GL_INVALID_ENUM is generated if pname is not one of the accepted tokens.