/*
* Quads are kept sorted by zOrder, and within zOrder, by Texture. In this way, we will
* minimized batches.
*/
public void addQuadToRenderList(QuickGUIQuad q)
{
bool added = false;
for (int it = 0; it < mRenderList.Count; it++)
{
QuickGUIQuad iq = mRenderList[it];
// quad is already in the list! update quad instead
if (iq.getID() == q.getID())
{
updateQuadInRenderList(q);
added = true;
break;
}
// zOrders are the same, now we want to group by texture
if (iq.getZOrder() == q.getZOrder())
{
// iterate until texture name found, or end of zOrder grouping
while (!iq.getTextureName().Equals(iq.getTextureName()) && (iq.getZOrder() == q.getZOrder()) && (it < mRenderList.Count))
{
++it;
}
// it is pointing to the end of the list, a quad with the same texture name, or a quad of another zOrder
mRenderList.Insert(it, q);
q._notifyChangesHandled();
added = true;
}
}
if (!added)
{
mRenderList.Remove(q);
}
mRenderListDirty = true;
}
private void _renderVertexBuffer()
{
if (mRenderList.Count == 0 || (mVertexBufferUsage == 0))
{
return;
}
uint bufferPosition = 0;
/*
* Since mRenderList is sorted by zOrder and by Texture, we can send quads with similar textures into one renderOperation.
* Everything rendered in one _render call will receive the texture set previously by _setTexture.
*/
for (int it = 0; it < mRenderList.Count; it++)
{
QuickGUIQuad iq = mRenderList[it];
string currentTexture = iq.getTextureName();
mRenderOperation.vertexData.vertexStart = bufferPosition;
// Iterate over quads with the same texture.
while ((it < mRenderList.Count) && (iq.getTextureName() == currentTexture))
{
bufferPosition += QuickGUIQuad.VERTEX_PER_QUAD;
++it;
}
// render quads
mRenderOperation.vertexData.vertexCount = bufferPosition - mRenderOperation.vertexData.vertexStart;
mRenderSystem._setTexture(0, true, currentTexture);
initRenderState();
mRenderSystem._render(mRenderOperation);
// with the while loop it is possible to iterate to the end of the list.
// At this point the for loop will increment it again, causing a crash.
if (it == mRenderList.Count)
{
break;
}
}
}