diff options
| -rwxr-xr-x | src/classes/com/sun/opengl/util/texture/Texture.java | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/util/texture/Texture.java b/src/classes/com/sun/opengl/util/texture/Texture.java index d634f66fb..f4a0a8be2 100755 --- a/src/classes/com/sun/opengl/util/texture/Texture.java +++ b/src/classes/com/sun/opengl/util/texture/Texture.java @@ -112,6 +112,28 @@ import com.sun.opengl.util.texture.spi.*; gl.glColor4f(r, g, b, a); </pre> * + * For reference, here is a list of the Porter-Duff compositing rules + * and the associated OpenGL blend functions (source and destination + * factors) to use in the face of premultiplied alpha: + * +<CENTER> +<TABLE WIDTH="75%"> +<TR> <TD> Rule <TD> Source <TD> Dest +<TR> <TD> Clear <TD> GL_ZERO <TD> GL_ZERO +<TR> <TD> Src <TD> GL_ONE <TD> GL_ZERO +<TR> <TD> SrcOver <TD> GL_ONE <TD> GL_ONE_MINUS_SRC_ALPHA +<TR> <TD> DstOver <TD> GL_ONE_MINUS_DST_ALPHA <TD> GL_ONE +<TR> <TD> SrcIn <TD> GL_DST_ALPHA <TD> GL_ZERO +<TR> <TD> DstIn <TD> GL_ZERO <TD> GL_SRC_ALPHA +<TR> <TD> SrcOut <TD> GL_ONE_MINUS_DST_ALPHA <TD> GL_ZERO +<TR> <TD> DstOut <TD> GL_ZERO <TD> GL_ONE_MINUS_SRC_ALPHA +<TR> <TD> Dst <TD> GL_ZERO <TD> GL_ONE +<TR> <TD> SrcAtop <TD> GL_DST_ALPHA <TD> GL_ONE_MINUS_SRC_ALPHA +<TR> <TD> DstAtop <TD> GL_ONE_MINUS_DST_ALPHA <TD> GL_SRC_ALPHA +<TR> <TD> AlphaXor <TD> GL_ONE_MINUS_DST_ALPHA <TD> GL_ONE_MINUS_SRC_ALPHA +</TABLE> +</CENTER> + * * @author Chris Campbell * @author Kenneth Russell */ |