Program: 156491
Project: 156491
Buggy source:
@Override public void render(Pipe<PipeTransportFluids> pipe,double x,double y,double z,float f){
  PipeTransportFluids trans=pipe.transport;
  boolean needsRender=false;
  FluidRenderData renderData=trans.renderCache;
  for (int i=0; i < 7; ++i) {
    if (renderData.amount[i] > 0) {
      needsRender=true;
      break;
    }
  }
  if (!needsRender) {
    return;
  }
  if (pipe.container == null)   return;
  GL11.glPushMatrix();
  GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
  GL11.glEnable(GL11.GL_CULL_FACE);
  GL11.glDisable(GL11.GL_LIGHTING);
  GL11.glEnable(GL11.GL_BLEND);
  GL11.glBlendFunc(GL11.GL_SRC_ALPHA,GL11.GL_ONE_MINUS_SRC_ALPHA);
  GL11.glTranslatef((float)x,(float)y,(float)z);
  int skylight=pipe.container.getWorld().getSkyBlockTypeBrightness(EnumSkyBlock.Sky,pipe.container.x(),pipe.container.y(),pipe.container.z());
  int blocklight=pipe.container.getWorld().getSkyBlockTypeBrightness(EnumSkyBlock.Block,pipe.container.x(),pipe.container.y(),pipe.container.z());
  boolean sides=false, above=false;
  for (  ForgeDirection side : ForgeDirection.VALID_DIRECTIONS) {
    int i=side.ordinal();
    if (renderData.amount[i] <= 0) {
      continue;
    }
    if (!pipe.container.isPipeConnected(side)) {
      continue;
    }
    DisplayFluidList d=getDisplayFluidLists(renderData.fluidID,skylight,blocklight,renderData.flags,pipe.container.getWorldObj());
    if (d == null) {
      continue;
    }
    int stage=(int)((float)renderData.amount[i] / (float)(trans.getCapacity()) * (LIQUID_STAGES - 1));
    GL11.glPushMatrix();
    int list=0;
switch (ForgeDirection.VALID_DIRECTIONS[i]) {
case UP:
      above=true;
    list=d.sideVertical[stage];
  break;
case DOWN:
GL11.glTranslatef(0,-0.75F,0);
list=d.sideVertical[stage];
break;
case EAST:
case WEST:
case SOUTH:
case NORTH:
sides=true;
GL11.glTranslatef(0.5F,0.0F,0.5F);
GL11.glRotatef(angleY[i],0,1,0);
GL11.glRotatef(angleZ[i],0,0,1);
GL11.glTranslatef(-0.5F,0.0F,-0.5F);
list=d.sideHorizontal[stage];
break;
default :
}
bindTexture(TextureMap.locationBlocksTexture);
RenderUtils.setGLColorFromInt(renderData.color);
GL11.glCallList(list);
GL11.glPopMatrix();
}
if (renderData.amount[6] > 0) {
DisplayFluidList d=getDisplayFluidLists(renderData.fluidID,skylight,blocklight,renderData.flags,pipe.container.getWorldObj());
if (d != null) {
int stage=(int)((float)renderData.amount[6] / (float)(trans.getCapacity()) * (LIQUID_STAGES - 1));
bindTexture(TextureMap.locationBlocksTexture);
RenderUtils.setGLColorFromInt(renderData.color);
if (above) {
GL11.glCallList(d.centerVertical[stage]);
}
if (!above || sides) {
GL11.glCallList(d.centerHorizontal[stage]);
}
}
}
GL11.glPopAttrib();
GL11.glPopMatrix();
}

Fixed version (ground truth):
@Override public void render(Pipe<PipeTransportFluids> pipe,double x,double y,double z,float f){
  PipeTransportFluids trans=pipe.transport;
  boolean needsRender=false;
  FluidRenderData renderData=trans.renderCache;
  for (int i=0; i < 7; ++i) {
    if (renderData.amount[i] > 0) {
      needsRender=true;
      break;
    }
  }
  if (!needsRender) {
    return;
  }
  if (pipe.container == null) {
    return;
  }
  GL11.glPushMatrix();
  GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
  GL11.glEnable(GL11.GL_CULL_FACE);
  GL11.glDisable(GL11.GL_LIGHTING);
  GL11.glEnable(GL11.GL_BLEND);
  GL11.glBlendFunc(GL11.GL_SRC_ALPHA,GL11.GL_ONE_MINUS_SRC_ALPHA);
  GL11.glTranslatef((float)x,(float)y,(float)z);
  int skylight=pipe.container.getWorld().getSkyBlockTypeBrightness(EnumSkyBlock.Sky,pipe.container.x(),pipe.container.y(),pipe.container.z());
  int blocklight=pipe.container.getWorld().getSkyBlockTypeBrightness(EnumSkyBlock.Block,pipe.container.x(),pipe.container.y(),pipe.container.z());
  boolean sides=false, above=false;
  for (  ForgeDirection side : ForgeDirection.VALID_DIRECTIONS) {
    int i=side.ordinal();
    if (renderData.amount[i] <= 0) {
      continue;
    }
    if (!pipe.container.isPipeConnected(side)) {
      continue;
    }
    DisplayFluidList d=getDisplayFluidLists(renderData.fluidID,skylight,blocklight,renderData.flags,pipe.container.getWorldObj());
    if (d == null) {
      continue;
    }
    int stage=(int)((float)renderData.amount[i] / (float)(trans.getCapacity()) * (LIQUID_STAGES - 1));
    GL11.glPushMatrix();
    int list=0;
switch (ForgeDirection.VALID_DIRECTIONS[i]) {
case UP:
      above=true;
    list=d.sideVertical[stage];
  break;
case DOWN:
GL11.glTranslatef(0,-0.75F,0);
list=d.sideVertical[stage];
break;
case EAST:
case WEST:
case SOUTH:
case NORTH:
sides=true;
GL11.glTranslatef(0.5F,0.0F,0.5F);
GL11.glRotatef(angleY[i],0,1,0);
GL11.glRotatef(angleZ[i],0,0,1);
GL11.glTranslatef(-0.5F,0.0F,-0.5F);
list=d.sideHorizontal[stage];
break;
default :
}
bindTexture(TextureMap.locationBlocksTexture);
RenderUtils.setGLColorFromInt(renderData.color);
GL11.glCallList(list);
GL11.glPopMatrix();
}
if (renderData.amount[6] > 0) {
DisplayFluidList d=getDisplayFluidLists(renderData.fluidID,skylight,blocklight,renderData.flags,pipe.container.getWorldObj());
if (d != null) {
int stage=(int)((float)renderData.amount[6] / (float)(trans.getCapacity()) * (LIQUID_STAGES - 1));
bindTexture(TextureMap.locationBlocksTexture);
RenderUtils.setGLColorFromInt(renderData.color);
if (above) {
GL11.glCallList(d.centerVertical[stage]);
}
if (!above || sides) {
GL11.glCallList(d.centerHorizontal[stage]);
}
}
}
GL11.glPopAttrib();
GL11.glPopMatrix();
}