Name

cgGLSetStateMatrixParameter - set the values of a matrix parameter to a matrix in the OpenGL state

Synopsis

#include <Cg/cgGL.h>

void cgGLSetStateMatrixParameter( CGparameter param,
                                  CGGLenum matrix,
                                  CGGLenum transform );

Parameters

param

The matrix parameter that will be set.

matrix

An enumerant indicating which matrix should be retrieved from the OpenGL state. Must be one of the following :

• CG_GL_MODELVIEW_MATRIX
• CG_GL_PROJECTION_MATRIX
• CG_GL_TEXTURE_MATRIX
• CG_GL_MODELVIEW_PROJECTION_MATRIX

transform

An enumerant indicating an optional transformation that may be applied to the matrix before it is set. Must be one of the following :

• CG_GL_MATRIX_IDENTITY
• CG_GL_MATRIX_TRANSPOSE
• CG_GL_MATRIX_INVERSE
• CG_GL_MATRIX_INVERSE_TRANSPOSE

Return Values

None.

Description

cgGLSetStateMatrixParameter sets a matrix parameter to the values retrieved from an OpenGL state matrix. The state matrix to retrieve is indicated by matrix, which may be one of the following :

CG_GL_MODELVIEW_MATRIX

Get the current modelview matrix.

CG_GL_PROJECTION_MATRIX

Get the current projection matrix.

CG_GL_TEXTURE_MATRIX

Get the current texture matrix.

CG_GL_MODELVIEW_PROJECTION_MATRIX

Get the concatenated modelview and projection matrices.

The transform parameter specifies an optional transformation which will be applied to the retrieved matrix before setting the values in the parameter. transform must be one of the following :

CG_GL_MATRIX_IDENTITY

Don't apply any transform, leaving the matrix as is.

CG_GL_MATRIX_TRANSPOSE

Transpose the matrix.

CG_GL_MATRIX_INVERSE

Invert the matrix.

CG_GL_MATRIX_INVERSE_TRANSPOSE

Transpose and invert the matrix.

cgGLSetStateMatrixParameter may only be called with a uniform matrix parameter. If the size of the matrix is less than 4x4, the upper left corner of the matrix that fits into the given matrix parameter will be returned.

Examples

to-be-written

Errors

CG_INVALID_PROFILE_ERROR is generated if param's profile is not a supported OpenGL profile.

CG_NOT_MATRIX_PARAM_ERROR is generated if param is not a matrix parameter.

CG_INVALID_ENUMERANT_ERROR is generated if either matrix or transform is not one of the allowed enumerant values.

CG_INVALID_PARAM_HANDLE_ERROR is generated if param is not a valid parameter.

CG_INVALID_PARAMETER_ERROR is generated if the parameter fails to set for any other reason.

History

cgGLSetStateMatrixParameter was introduced in Cg 1.1.

See Also

cgGLSetMatrixParameter, cgGLGetMatrixParameter