[dxvk] Set layer count to one when no attachments are present (doitsu…

…jin#3)

set layer count to 1 without attachments

Insipred by CX Hack 20098 and needed for Apple's tiled GPUs and certain
titles (most notably ffxiv)

src/dxvk/dxvk_framebuffer.cpp

@@ -168,6 +168,11 @@ namespace dxvk {
     fbInfo.width                = info.size().width;
     fbInfo.height               = info.size().height;
     fbInfo.layers               = info.size().layers;
+
+    /* Insipred by CX Hack 20098: Force layer count to 1 so Apple's tiled GPUs don't preallocate
+     * huge amounts of memory for rasterization when there are no attachments. */
+    if (!attachmentCount)
+        fbInfo.layers           = 1;
 
     if (m_vkd->vkCreateFramebuffer(m_vkd->device(), &fbInfo, nullptr, &m_handle) != VK_SUCCESS)
       Logger::err("DxvkFramebuffer: Failed to create framebuffer object");