Lines Matching refs:alpha

34     Transparency is done in OpenGL using alpha blending. An alpha value
35     of 0.0 is used for fully transparent objects, while an alpha value
39     OpenGL defines alpha as a component of the vertex color state.
40     Whenever a color is set, the alpha component is set along with the
43     modifying the color of each vertex, replacing the old alpha
44     component with the new alpha component.  This can be very expensive
48     This extension defines a new global alpha attribute that can be
49     used to specify an alpha factor that is independent from the alpha
50     component of the color value.  The global alpha factor is
51     multiplied by the fragment's alpha value after primitive
53     fragment's alpha value.  The global alpha extension is only
96     Global alpha processing is a new stage in the rasterization
99     operations.  Global alpha processing is only done in RGBA mode.
102     Global alpha processing is enabled or disabled with the Enable and
104     The global alpha factor is set using one of the GlobalAlphaFactor*SUN
107     If global alpha processing is enabled, then the global alpha factor
108     is multiplied by the incoming fragment's alpha value.  This
109     product replaces the fragment's alpha value and is passed to
114     fragment is to multiply the alpha values at each vertex of the
115     primitive by the global alpha factor prior to the primitive