glMatrixMode.3G man page
glMatrixMode — specify which matrix is the current matrix
void glMatrixMode(GLenum mode);
Specifies which matrix stack is the target for subsequent matrix operations. Three values are accepted: GL_MODELVIEW, GL_PROJECTION, and GL_TEXTURE. The initial value is GL_MODELVIEW. Additionally, if the ARB_imaging extension is supported, GL_COLOR is also accepted.
glMatrixMode sets the current matrix mode. mode can assume one of four values:
Applies subsequent matrix operations to the modelview matrix stack.
Applies subsequent matrix operations to the projection matrix stack.
Applies subsequent matrix operations to the texture matrix stack.
Applies subsequent matrix operations to the color matrix stack.
To find out which matrix stack is currently the target of all matrix operations, call glGet() with argument GL_MATRIX_MODE. The initial value is GL_MODELVIEW.
GL_INVALID_ENUM is generated if mode is not an accepted value.
GL_INVALID_OPERATION is generated if glMatrixMode is executed between the execution of glBegin() and the corresponding execution of glEnd().
glGet() with argument GL_MATRIX_MODE
glLoadMatrix(), glLoadTransposeMatrix(), glMultMatrix(), glMultTransposeMatrix(), glPopMatrix(), glPushMatrix()
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