rsx: Texture cache fixes and improvments

gl/vk/rsx: Refactoring; unify texture cache code
gl: Fixups
- Removes rsx::gl::texture class and leave gl::texture intact
- Simplify texture create and upload mechanisms
- Re-enable texture uploads with the new texture cache mechanism
rsx: texture cache - check if bit region fits into dst texture before attempting to copy
gl/vk: Cleanup
- Set initial texture layout to DST_OPTIMAL since it has no data in it anyway at the start
- Move structs outside of classes to avoid clutter

rpcs3/Emu/RSX/GL/GLTextureCache.cpp

@@ -1,63 +0,0 @@
-#include "stdafx.h"
-#include "GLGSRender.h"
-#include "GLTextureCache.h"
-
-namespace gl
-{
-	bool texture_cache::flush_section(u32 address)
-	{
-		if (address < no_access_range.first ||
-			address >= no_access_range.second)
-			return false;
-
-		bool post_task = false;
-		cached_texture_section* section_to_post = nullptr;
-
-		{
-			rsx::conditional_lock<shared_mutex> lock(in_access_violation_handler, m_section_mutex);
-
-			for (cached_texture_section &tex : no_access_memory_sections)
-			{
-				if (tex.is_dirty()) continue;
-
-				if (tex.is_locked() && tex.overlaps(address))
-				{
-					if (tex.is_flushed())
-					{
-						LOG_WARNING(RSX, "Section matches range, but marked as already flushed!, 0x%X+0x%X", tex.get_section_base(), tex.get_section_size());
-						continue;
-					}
-
-					//LOG_WARNING(RSX, "Cell needs GPU data synced here, address=0x%X", address);
-
-					if (std::this_thread::get_id() != m_renderer_thread)
-					{
-						post_task = true;
-						section_to_post = &tex;
-						break;
-					}
-
-					tex.flush();
-					return true;
-				}
-			}
-		}
-
-		if (post_task)
-		{
-			//LOG_WARNING(RSX, "Cache access not from worker thread! address = 0x%X", address);
-			work_item &task = m_renderer->post_flush_request(address, section_to_post);
-
-			vm::temporary_unlock();
-			{
-				std::unique_lock<std::mutex> lock(task.guard_mutex);
-				task.cv.wait(lock, [&task] { return task.processed; });
-			}
-
-			task.received = true;
-			return task.result;
-		}
-
-		return false;
-	}
-}