I love the work and effort you put into Optifine. Been tracking your progress this past week and I am excited for the 1.9 release. Now I would advise at some point getting a paypal donation page to make it easier for US located persons to donate to you. I have no problem supporting someone that improves the quality of a game like this on their own time! Thanks in advance!
What is a 'dedicated gbuffer for semitransparent objects' and why is it useful?
It's a shader that would allow shaderpack developers to render water separately from glass. It's useful because you want glass to act like a solid and water to act like a liquid, so currently most shaderpacks have to put the logic for both glass and water in the same file. With a separate shader for glass, shader development will get a good bit easier.
If it's installed this way, Optifine has a built-in installer that looks for the correct version of Minecraft on your system and then creates an Optifine profile for it. If you make this batch file, make sure the batch file is located wherever you downloaded Optifine and then change the above path to wherever 'javaw.exe' is located. Another thing you can probably do is right-click on the Optifine .jar download and choose 'Open with...' and then find 'javaw.exe' and see if that'll let you install it (I couldn't get that option to work, but maybe you'll have better luck with it). Hope that helps!
sp614x, all I gotta say is 'wow'. Just plain wow. You code like a machine, and I appreciate how you're testing Optifine on a middle-of-the-road machine with an Intel video card because those are the ones who will benefit most from the final result of your programming awesomeness. Keep up the good work, you rock!
I got up to the 'Click Open With' bit, and I cannot see javaw or Java anywhere
That would mean you don't have Java installed, which isn't possible if you can play MC. So something's wrong.
I'll try explaining, since I am using an English language system (and RoiEx wasn't): RIGHT click on the Optifine.jar file, and select OPEN WITH. Then, choose Java as the program you want to open it with. When you click OPEN WITH you should see a list of programs to choose. If you see Java, open with that. If not, select CHOOSE DEFAULT PROGRAM and then find Java under "other programs."
If you stilldon't see Java listed under other programs, click BROWSE and go to C:\Program Files\Java\jre[versionNumber]\bin and select JAVAW.exe.