void ReallyCreateAtlas()
{
m_Atlas = new UIRAtlasManager(
m_VertexTexturingEnabled ? RenderTextureFormat.ARGBFloat : RenderTextureFormat.ARGB32, // If no vertex texturing, only store opacity in ARGB32
FilterMode.Point, // Filtering is never needed for this texture
Math.Max(pageWidth, pageHeight * 3), // Each transform row is stored vertically
64); // Because we want predictable placement of first pages, 64 will fit all three default allocs
// The order of allocation from the atlas below is important. See the comment at the beginning of Construct().
RectInt rcTransform, rcClipRect, rcOpacity;
m_Atlas.AllocateRect(pageWidth * m_TransformAllocator.entryWidth, pageHeight * m_TransformAllocator.entryHeight, out rcTransform);
m_Atlas.AllocateRect(pageWidth * m_ClipRectAllocator.entryWidth, pageHeight * m_ClipRectAllocator.entryHeight, out rcClipRect);
m_Atlas.AllocateRect(pageWidth * m_OpacityAllocator.entryWidth, pageHeight * m_OpacityAllocator.entryHeight, out rcOpacity);
if (!AtlasRectMatchesPage(ref m_TransformAllocator, identityTransform, rcTransform))
{
throw new Exception("Atlas identity transform allocation failed unexpectedly");
}
if (!AtlasRectMatchesPage(ref m_ClipRectAllocator, infiniteClipRect, rcClipRect))
{
throw new Exception("Atlas infinite clip rect allocation failed unexpectedly");
}
if (!AtlasRectMatchesPage(ref m_OpacityAllocator, fullOpacity, rcOpacity))
{
throw new Exception("Atlas full opacity allocation failed unexpectedly");
}
var whiteTexel = UIRenderDevice.whiteTexel;
if (m_VertexTexturingEnabled)
{
var allocXY = AllocToTexelCoord(ref m_TransformAllocator, identityTransform);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y + 0, false, identityTransformRow0Value);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y + 1, false, identityTransformRow1Value);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y + 2, false, identityTransformRow2Value);
allocXY = AllocToTexelCoord(ref m_ClipRectAllocator, infiniteClipRect);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y, false, infiniteClipRectValue);
}
{
var allocXY = AllocToTexelCoord(ref m_OpacityAllocator, fullOpacity);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y, false, fullOpacityValue);
}
m_AtlasReallyCreated = true;
}
public void SetTransformValue(BMPAlloc alloc, Matrix4x4 xform)
{
Debug.Assert(alloc.IsValid());
if (m_VertexTexturingEnabled)
{
var allocXY = AllocToTexelCoord(ref m_TransformAllocator, alloc);
m_Atlas.EnqueueBlit(UIRenderDevice.whiteTexel, allocXY.x, allocXY.y + 0, false, xform.GetRow(0));
m_Atlas.EnqueueBlit(UIRenderDevice.whiteTexel, allocXY.x, allocXY.y + 1, false, xform.GetRow(1));
m_Atlas.EnqueueBlit(UIRenderDevice.whiteTexel, allocXY.x, allocXY.y + 2, false, xform.GetRow(2));
}
else
{
m_Transforms[AllocToConstantBufferIndex(alloc)] = new Transform3x4()
{
v0 = xform.GetRow(0),
v1 = xform.GetRow(1),
v2 = xform.GetRow(2)
}
};
}
