Accumulation Buffer problem

OpenGL Development
#1

Hi all,
Im having some trouble with the accumulation buffer, heres my routine:

Code:


GL11.glDisable(GL11.GL_DITHER); 
GL11.glEnable(GL11.GL_SCISSOR_TEST); 
GL11.glScissor(0, 0, width, height); 
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); 
GL11.glDisable(GL11.GL_SCISSOR_TEST); 
GL11.glEnable(GL11.GL_DITHER); 

GL11.glClear(GL11.GL_ACCUM_BUFFER_BIT); 
  for (int i = 0; i < 16; i++) { 
    GL11.glBegin(GL11.GL_QUADS); 
    GL11.glVertex3f(0 + (i/5), 0 + (i/5), 0); 
    GL11.glVertex3f(0 + (i/5), 1 + (i/5), 0); 
    GL11.glVertex3f(1 + (i/5), 1 + (i/5), 0); 
    GL11.glVertex3f(1 + (i/5), 0 + (i/5), 0);    
    GL11.glEnd(); 
    GL11.glAccum(GL11.GL_ACCUM, 1.0f / 16f); 
  } 
GL11.glAccum(GL11.GL_RETURN, 1.0f); 

GL11.glFlush(); 
Window.update();

and I get this error:

org.lwjgl.opengl.OpenGLException: Invalid operation (1282)
at org.lwjgl.opengl.Util.checkGLError(Unknown Source)
at org.lwjgl.opengl.Window.update(Unknown Source)
…

Im using LWJGL 0.9.

Any ideas?

#2

even just:


GL11.glClear(GL11.GL_ACCUM_BUFFER_BIT);
GL11.glAccum(GL11.GL_RETURN, 1.0f);

gets me the same error! :-[

#3

You don’t have any way of specifying accumulation buffers in LWJGL, so it’s probably not supported in your context. Same story with aux buffers. They should be added I suppose.

  • elias
#4

That means the following to me:

No simple way to do motion blur (albeit slow)
No simple way to antialias
No simple way to do soft shadows
and no simple way to do depth of field.

DP

#5

Worry not, it will soon come to a LWJGL implementation near you!

  • elias
#6

yay! :slight_smile: