Buffer confusion

[ChrisMAN]

I posted a gist describing the effect. download as start.lua and run engine.

 

https://gist.github.com/3971641

 

I am switching buffers and issuing drawing commands. The output drastically changes based upon whether or not I am drawing on the current frame. When there is no drawing on the current frame it renders more how i would expect it.

 

I am lacking intuition on how buffers work so any help is welcome.

 

Thanks

Chris

[ChrisMAN]

Would it sweeten the pot if I said I will release a lua based GUI kit as soon as I can use this for clipping stuff outside of a renerable area ??

 

pwetty pwease *kitten eyes

[ChrisMAN]

How did other people learn how buffers work?

[gamecreator]

I take it you've looked around here:

http://www.leadwerks...erence/buffers/

and/or here:

http://www.leadwerks...p?title=Buffers

 

That said, I never cared for them and most other engines don't use them.

[tjheldna]

Hi Chris,

 

This is ripped from my code in C++ I changed the variable names more genereic names. I have no idea how to do it in lua, but this may help.

 

 

 

TTexture bufferTexture;
TBuffer buf;

if(flags & flagsUpdateBuffer)
{

flags &= ~flagsUpdateBuffer;
if(bufferTexture)FreeTexture(bufferTexture);
bufferTexture = 0;
bufferTexture = CreateTexture(20, 20, TEXTURE_RGBA);

SetColorBuffer(buf, bufferTexture, 0, 0);

SetBuffer(buf);
//Do the buffer drawing here
SetBlend(BLEND_ALPHA);
//Draw red a rectangle in the buffer
SetColor(1.0F, 0.0F, 0.0F, 1.0F);
DrawRect(0, 0, 10, 10);
SetColor(1.0F, 1.0F,1.0F, 1.0F);
SetBuffer(BackBuffer());
}
//Draw the rectangle
DrawImage(bufferTexture, 0, 0, 20, 20);

[ChrisMAN]

I am drawing a buffer on to another buffer on to the back buffer. I could probably render all of the pieces on a flat higharchy.

 

It's wierd because the colors are getting inverted based upon whether i am drawing on the same frame as its rendering

[tjheldna]

Hmm don't know, my knowledge of the matter is minimal I needed help from other users to come up with that.

[ChrisMAN]

Not being good with c++ is a serious impedance to making a game. Not knowing the graphics subsystems is just about as bad. Can I trade in my l33t web skills for low level and compantency with math?

[ChrisMAN]

When I recreate the buffer on every frame I get rid of all of the problems.