= 0 A.D. Alpha 27: ——— =
Go to the [wiki:Changelogs changelog overview], if you are looking for a different release. [[BR]]
Check the [wiki:Alpha27?action=history history overview] to only read updates of this site. [[BR]]
[[TOC]]

Development started by Wildfire Games on 04/10/2022 (r27104). [[BR]]
Feature Freeze: **TBD.** [[BR]]
String Freeze:  **TBD.** [[BR]]
Translation Freeze: **TBD.** [[BR]]
Commit Freeze: **TBD.** [[BR]]
Release: **TBD.** [[BR]]

Release Announcement: TBA. [[BR]]
Tickets: [https://trac.wildfiregames.com/query?status=closed&group=resolution&milestone=Alpha+27 link]

An overview of all tickets handled is found at the respective [http://trac.wildfiregames.com/query?milestone=Alpha+27&max=50 milestone] on trac. [[BR]]
To download and install the developmental release of 0 A.D., have a look at the [wiki:BuildInstructions build instructions].

The following list presents all changes noticeable to the end user up to r27528. Many small bugfixes, typo fixes and code cleanups are not mentioned here. [[BR]]
See also [wiki:PortA26ToA27 Port A26 to A27]

== Gameplay ==
r27142 Only entities capable of capturing contribute to the regen-rate of structures (Phab:D4679). [[BR]]
r27244 Garrison Domestic Animals into the Corral to get a !ResourceTrickle of Food (Phab:D4380). [[BR]]
r27391 Add area damage to elephants (Phab:D4173). [[BR]]
r27399 Change default action from capture to attack (Phab:D4697). [[BR]]
r27400 Add Roman Centurions (Phab:D4872). [[BR]]
r27406 Han fixes (Phab:D4873):
- Adjust the cost of poison arrows and poison blades.
- Reduce the obstruction area of rice paddies so that they are easier to place. 
[[BR]]
r27455 Allow to garrison the Han minister in the corral. [[BR]]
r27455 Use different default hotkey ("C") for capturing (Phab:D4908). [[BR]]
r27527 Double wall turret placements for stone walls (Phab:D4914). [[BR]]
r27586 Allow ships to turn while in motion for more natural movement. [[BR]]
r27775 Differentiate Sparta (Phab:D4736):
- Syssition and Champions available in phase 1.
- Champions may promote to "Olympic Champions".
- Unique technologies for champion hoplites, melee units, and skirmishers.
- Unlock for Neodamodes spearmen, a cheap spearman that cannot gather.
[[BR]]
r27779 Differentiate Athens (Phab:D3727):
- Adds Hippocrates as a unique phase 2 hero.
- Elite Hoplites can promote to champion spearmen.
- 3 Unique technologies
- Use a range aura of 2 armor for Iphicrates.
[[BR]]
r27794 Fix Liu Bang's Cavalry Aura (Phab:D5080). [[BR]]
r27827 Give Agis a metal discount aura, increase health. [[BR]]
r27828 Differentiate Macedonians (Phab:D5096):
- Move Siege workshop to town phase.
- Access Bolt Shooters in town phase.
[[BR]]
r27829 Train women from houses without researching fertility festival (Phab:5112). [[BR]]
r27831 Add a small splash attack to catapults (Phab:D5053). [[BR]]
r27834 Differentiate Chariots: Costlier, faster, more health, but slow acceleration (Phab:D5119). [[BR]]
r27836 Briton/Gaul druid aura: "Deas Celtica" (Phab:D5116). [[BR]]
r27852 Carthage apartments accessed in village phase, houses can upgrade to apartments (Phab:5117). [[BR]]
r27858 Return Carthage Sacred Band cavalry to the temple (Phab:D5126). [[BR]]
r27864 Add a "Cataphract" mixin: +1 armor of all types, but +10% metal cost and -5% speed (Phab:5141). [[BR]]
r27865 Reduce bolt and catapult prepare time to reduce clunkiness (Phab:D5131). [[BR]]
r27871 Add a longsword mixin that adds a splash attack (Phab:D5145)
r27890 Add Dog Kennel special building for britons (Phab:D5153). [[BR]]
r27898 Add a "Hero" temple for the Ptolemies (Phab:D5169). [[BR]]
r27900 Add the Marian Reforms unique technology (Phab:D5109):
- Unlock training Centurions, Onagers, Legionary Swordsmen and Legionary Skirmishers.
- Lose access to Extraordinarii infantry, spear cavalry.
- Allied cavalry are re-skinned to Auxiliary cavalry.
[[BR]]
r27901 Add the Onager to complete reforms technology (Phab:D5114). [[BR]]
r27902 Let marines train from the gymnaium, use iphicratean reforms to unlock "dock" variants of marines and archers (Phab:D5168). [[BR]]
r27910 Enlarge chickens so they can't hide in grasses (Phab:D5177). [[BR]]
r27915 "Nile Delta" bonus for Ptolemies, all farming techs available in village phase. [[BR]]
r27922 Garrison rams for added speed and acceleration (Phab:D5179). [[BR]]
r27934 Add "Roman Roads" unique technology for the romans: +5% speed for land units (Phab:5183). [[BR]]
r27951 Increase Ptolemaic bolt shooter fire rate (Phab:D5170). [[BR]]
r27954 Add "Satrapy Tribute" to persian throne hall, allowing the player's choice of trickle (Phab:D5192). [[BR]]
r27956 Add "Woad Warriors" civ bonus for britons, faster infantry (Phab:D5190). [[BR]]
r27958 New tech for the Mauryans called "Ahimsa": +100% berry gather rate, but -80% fish and meat gather rate (Phab:D5175). [[BR]]
r27963 New temple technology "Sacrificial Ritual": Healers train 40% faster, and the metal cost is removed (Phab:D5188). [[BR]]
r27978 Remove territory decay from Roman Army Camp and Siege Walls (Phab:D5215). [[BR]]
r27990 Move Persian Immortals to the barracks, make them cheaper and weaker (Phab:D5202). [[BR]]
r27996 Naval Overhaul (Phab:D5213):
- Ships do not use BuildingAI.
- Ships are split into unit roles: scout ship, arrow ship, ram ship, fire ship, and siege ship.
[[BR]]

== Maps ==
r27635 Fix incorrect fruit bush in Gulf of Bothnia frozen. [[BR]]
r27899 Add a new 2 player skirmish map "Isthmus of Corinth" (Phab:D5164). [[BR]]
r27903 Update "Watering Holes" 4 player skirmish map. [[BR]]
r27909 Fix very steep shores in Elephantine (Phab:D5132). [[BR]]
r27992 Add water level support to Flood (Phab:D5139). [[BR]]

== AI ==
r27141 Implement simple emergency detection (Phab:D4645).

== Modding ==
r27245 Use Requirements helper for requirements (Phab:D4514). Allows:
- Having multiple requirements.
- Having entity requirements.
- Negating tech requirements.
[[BR]]
r27883 Remove Engine.!IsGameStarted (Phab:D5143).

== Balancing ==
Include community balance mod:
- r27392 Move tier 2 blacksmith technologies to Town Phase.
- r27393 Rebalance healers by making them cheaper.
- r27394 Pericles and Themistocles improvements.
- r27395 Axe cav minor buff.
- r27397 Rebalance some civ and team bonus. [[BR]]
r27407 Han: Reduce pop cost of ministers (Phab:D4874). [[BR]]
r27410 [Community Mod] Includes (Phab:D4877):
- CC/colony cost changes
- Roman camp in p2
- Spearcav acceleration increase
- Alexander hero auras
- Seleucid civ bonus [[BR]]
r27584 Reduce Batch modifier of Upgraded Han CC. [[BR]]
r27585 Reduce Catapult and Siege Ship range. [[BR]]
r27668 Rebalance Elephant Splash damage (Phab:D5008). [[BR]]
r27848 Reduce Loom Cost 200food -> 100food (Phab:D5118). [[BR]] 

== Engine ==
- r27106 Adds PS::span and std::string_view to CmdLineArgs. (Phab:D4677)
- r27110 Fixes vertex attribute stride in Canvas2D.
- r27156 Skips renderer resources preloading for screenshots.
- r27160 Reset m_EndsWithSpace to fix the uninitialized read of it introduced in rP26915. (Phab:D4806)
- r27164 Allow 0.0.0.0 IP in StunClient tests added in rP25448. (Phab:D4792)
- r27174 Fixes without PCH build in StunClient missing include for std::byte added in rP25453. (Phab:D4814)
- r27192 Remove user.cfg from javascript
- r27202 Restrict access for Read/WriteFile functions
- r27230 Add JS bindings for in game camera attributes. (Phab:D4667)
- r27236 Updates glad library to 2.0.2.
- r27268 Fixes calling SDL functions in CVideoMode after SDL_Quit. (Phab:D4836)
- r27275 Makes GLES using high precision for both vertex and fragment shaders.
- r27329 Adds StaticVector implementation. (Phab:D4838)
- r27335 Update enet on Windows to 1.3.17.
- r27385 FSM cleanup: (Phab:D4868)
- r27388 Refactors window creation in CVideoMode. (Phab:D4866)
- r27398 Optional column "sort_order" attribute support olist GUI
- r27409 [SM91] Update to Spidermonkey 91.1.3 APIs (Phab:D4428)
- r27412 Adds Vulkan backend. (Phab:D4876)
- r27426 Commit the Spidermonkey tarball, as it puts extra strain on CI, and package manager builds don't have internet.
- r27438 Fixes creating window on macOS in case of missing Vulkan driver. Fixes #6681 (Phab:D4884)
- r27440 Fix bundled spidermonkey code in Premake.
- r27441 Fix a case sensitive issue on macOS. macOS usually do not use a case sensitive filesystem, hence why it got unnoticed.
- r27442 Fix a bug with Python >= 3.11 where -rU was removed as an open flag. (Phab:D4888)
- r27451 Fixes builds on some platforms for libfmt 4 after rP27329. (Phab:D4890)
- r27457 Update clean-workspaces.sh after SpiderMonkey's upgrade to 78.6.0 and 91.13.1.
- r27460 Fix and cleanup the SM91 build, fixes #6676. (Phab:D130410)
- r27461 Don't include source/test_root.cpp in bundles. (Phab:D4895)
- r27469 Fix FMT and NVTT not linking with the correct SDK. (Phab:D4898)
- r27470 Follow proper Shutdown sequence when using -dumpSchema, fixes #6696. (Phab:D4903)
- r27492 Fixes shadows cascades iteration.
- r27493 Updates shadows camera frustum after its recalculation.
- r27499 Fix: Crash atlas in relation to Terrain.cpp CalcPosition (Phab:D4900)
- r27512 Fixes DisplayVersion in NSIS on Windows. (Phab:D4892)
- r27513 ATLAS UI be aware of GUI Scale user config (Phab:D4915)
- r27517 Fix a warning in gloox headers on Windows after rP27490, refs #3004.
- r27521 Fixes Atlas previews after rP26142. (Phab:D4919)
- r27555 Fixes --with-system-premake5, fixes #6710, refs rP23675.
- r27556 Removes ogl.h from PCH. (Phab:D4950)
- r27564 Fixes GL ES version report after GL_INVALID_ENUM triggered by glEnable(GL_TEXTURE_2D).
- r27599 Use a lower default MTU for ENet hosts, and make it configurable. (Phab:D4967)
- r27601 Removes assertion from MinimapTexture on entities overflow.
- r27603 Adds an option to disable mouse grab in fullscreen. (Phab:D4974)
- r27606 Use premake5 beta2's `externalincludedirs` when available (Phab:D4980)
- r27607 Adds more libraries to feedback reports. (Phab:D4949)
- r27717 Removes waiting from MapGenerator. This makes the game window more responsible during map generating. (Phab:D3676)
- r27740 Use std::function in the Loader. (Phab:D4989)

=== Vulkan ===
Changes related to Vulkan particularly:

- r27109 Removes drawing via IDeviceCommandContext from CMinimap. (Phab:D4779)
- r27110 Fixes vertex attribute stride in Canvas2D.
- r27134 Replaces border color of sampler by enum.
- r27136 Reduces uniforms sizes for the Canvas2D shader. (Phab:D4796)
- r27137 Moves vertex buffer offset to SetVertexBuffer.
- r27138 Reduces the number of SetVertexAttributeFormat calls in Canvas2D.
- r27139 Fixes calls to SetVertexAttributeFormat with zero stride.
- r27145 Fixes vertex attribute format in minimap and passes dependent textures as parameters.
- r27147 Reduces uniforms sizes for the minimap shader.
- r27148 Adds AcquireNextBackbuffer to CDevice to have something to present.
- r27151 Adds BeginFramebufferPass/EndFramebufferPass instead of SetFramebuffer.
- r27152 Adds usage flags to backend textures.
- r27167 Moves skybox vertex array creation and uploading before its rendering.
- r27173 Moves Backend enum from CVideoMode to backends. (Phab:D4809)
- r27182 Disallows backend buffer uploading inside framebuffer pass. (Phab:D4815)
- r27184 Makes AcquireNextBackbuffer returns true in case of successful backbuffer acquirement.
- r27198 Wraps gl_Position in a macro to avoid duplication for different versions.
- r27199 Wraps vertex attributes in a macro to avoid duplication for different versions.
- r27204 Wraps gl_FragColor in a macro to avoid duplication for different versions.
- r27207 Moves particles data uploading out of framebuffer pass. (Phab:D4820)
- r27208 Reduces the uniform size of a texture transform of debug overlay shader.
- r27209 Reduces the uniform size of an instancing transform of overlay solid shader.
- r27222 Removes unused UV1 stream in OverlayRenderer and moves vertex data setup out of a loop.
- r27232 Moves post processing out of scene rendering to avoid framebuffer pass duplicate. (Phab:D4827)
- r27236 Updates glad library to 2.0.2.
- r27256 Adds framebuffer attachment load and store operations. (Phab:D4830)
- r27282 Reduces shader inputs duplication and wraps them in a macro. Refs #6636 (Phab:D4837)
- r27313 Removes SetViewport from CRenderer. (Phab:D4849)
- r27328 Switches from pipeline state descriptions to pipeline states. (Phab:D4850)
- r27331 Fixes vertex attribute format mismatch for silhouette debug rendering.
- r27363 Switches from per draw vertex attribute format to precompiled vertex input layout. (Phab:D4852)
- r27379 Adds preferred depth stencil format to renderer backend.
- r27387 Adds dependent libraries for Vulkan. Refs #6636 (Phab:D4869)
- r27412 **Adds Vulkan backend.** (Phab:D4876)
- r27418 Fixes silhouettes on Vulkan by using VkStencilOpState.
- r27421 Ands new depth stencil format to support all combinations on Vulkan. (Phab:D4878)
- r27422 Recreates Vulkan swapchain on window resize. (Phab:D4879)
- r27446 Removes unnecessary PreDraw from Vulkan CDeviceCommandContext.
- r27450 Hides some warnings for VMA. (Phab:D4889)
- r27475 Fixes querying descriptor indexing features and properties on some drivers.
- r27477 Disables descriptor indexing on macOS.
- r27478 Adds a warning in case of Vulkan window creation failure.
- r27488 Add MoltenVK support to fix Vulkan on macOS. (Phab:D4905)
- r27494 Enables non-solid fill for Vulkan to allow wireframe drawing.
- r27495 Creates image views for Vulkan textures only when needed.
- r27496 Prevents using R8G8B8_UNORM format for Vulkan textures as it can be supported as a native format only by workarounds.
- r27501 Fix Molten VK printing too many log messages (Phab:D4913)
- r27502 Adds more features to report for Vulkan backend.
- r27503 Uses Vulkan physical device indices as the last comparison for device selection.
- r27510 Extends logs for Vulkan available device.  (Phab:D4917)
- r27511 Fixes descriptor set overwrite when multiple textures reference it with delayed deletion. Fixes #6717 (Phab:D4916)
- r27516 Makes Vulkan device selection stop searching after a first suitable queue family.
- r27522 Fixes overflow of inplace vertex and index Vulkan buffers. (Phab:D4920)
- r27536 Fixes invalid swapchain size during a window minimize. (Phab:D4932)
- r27537 Increases minImageCount for Vulkan swapchain only when there is a room for that.
- r27541 Check for the existence of libMoltenVK
- r27552 Implements framebuffer readback for Vulkan to allow screenshots. (Phab:D4940)
- r27573 Switches VMA to Vulkan 1.1. (Phab:D4947)