NAME fglBlendColorEXT - set the blend color FORTRAN SPECIFICATION SUBROUTINE fglBlendColorEXT( REAL*4 red, REAL*4 green, REAL*4 blue, REAL*4 alpha ) PARAMETERS GL_BLEND_COLOR_EXT red, green, blue, alpha specify the components of DESCRIPTION The GL_BLEND_COLOR_EXT may be used to calculate the source and destination blending factors. See fglBlendFunc for a complete description of the blending operations. Initially the GL_BLEND_COLOR_EXT is set to (0,0,0,0). NOTES fglBlendColorEXT is part of the _extname(EXT_blend_color) extension, not part of the core GL command set. If _extstring(EXT_blend_color) is included in the string returned by fglGetString, when called with argument GL_EXTENSIONS, extension _extname(EXT_blend_color) is supported by the connection. ERRORS GL_INVALID_OPERATION is generated if fglBlendColorEXT is executed between the execution of fglBegin and the corresponding execution of fglEnd. ASSOCIATED GETS fglGet with an argument of GL_BLEND_COLOR_EXT. SEE ALSO fglBlendFunc, fglGetString.