Editing Doom v0.4

{{Doom alpha versions|pic=Doom04 title.png}}
'''Doom 0.4''' was an [[alpha]] version of [[Doom]] released to testers on April 2, 1993. At this point in development, a number of elements had already been completed, and it appears that the main features of the renderer were already in place.

==Features==
[[File:0.4_title_screen.png|thumb|Main menu]]
[[File:0.4.png|thumb|This is what the [[ENDOOM]] WAD lump was like in Doom 0.4.]]

Version 0.4 included the following features:

* A spinning 3D title screen, which was removed before the release version of the game.
* The engine could render areas with different floor and ceiling heights, textured walls and ceilings, and different light levels.
* Prone feature (removed from final version).
* Collision detection was performed against the walls. However, there was no collision detection with sprites (e.g. monsters).
* [[Monster]]s appeared in some of the levels. Although they were animated, they did not move or react to the player or to other monsters. Early versions of the [[Lost Soul]] sprites were included in the [[WAD]] file, although they did not appear during play.
* The player's weapon bobbed during movement and could be fired although it had no effect on the environment or monster sprites.
* The game included a basic, but non-functional, [[status bar]].
* Doors (but no other moving sector types) work and can be opened with the Alt key.

Keys used in the alpha that aren't related to player movement include:

* Q, W and E change the detail mode for rendering, Q being high detail in the final, W being low detail in the final, and E being low detail in addition to halved vertical resolution.
* R invokes a hi-color mode planned for use with VGA modules such as the [http://archive.gamedev.net/archive/reference/articles/article376.html Sierra Hi-Color DAC]. Without this module, the key produces pink, yellow and grey stripes.
* T makes the player spin around in circles to test framerate, but crashes as soon as a movement key is pressed.
* P shows a message box displaying the message "Start Profile", and will then crash if pressed again. In [[Doom v0.3]], this would create a file named PROFILE.DAT.
* Z, X and C alter the display of floor and ceiling textures ("Wolf mode"). It is unknown as to whether this was a testing feature or a planned detail mode.
* M triggers the "prone" mode (lowers camera viewpoint).

== Levels ==
[[File:Doom_0.4.png|thumb|Screenshot from Doom 0.4. The [[demon]] sprite is minimally different from the final version.]]

Version 0.4 included 11 levels, some of which (after significant changes in architecture and/or texturing) became levels in Doom:

* Level 1: [[E2M7: Spawning Vats|E2M7 (Spawning Vats)]]. Unlike registered Doom the level has no Hell textures and is designed to be like "Hangar 2" in the [[Doom Bible]]. The [[blue keycard]] room is a hangar with the number "2" near the center of the room and an electric track running through the center of the room. The ground floor has large crate room with only three or so crates and an exit, corresponding with the Bible's description of the ground floor.
* Level 2: [[E2M2: Containment Area|E2M2 (Containment Area)]]. Again the level has no Hell textures, unlike the final version. It seems to be based off of "Supply Depot 2" in the Doom Bible, as it has a crate maze on the ground floor, a maze on the second one and is the level after Hangar 2, which is E1M1 in the alpha. Ultimately the level became "Containment Area" in registered Doom.
* Level 3: Ultimately became [[E2M3: Refinery|E2M3 (Refinery)]] in registered Doom. The Refinery is the earliest level made by [[Tom Hall]]; Doom design was still in "Wolfenstein mode" with mostly 90° angles and little or no use of the Z axis.
* Level 4: Became [[E1M7: Computer Station|E1M7 (Computer Station)]] in registered Doom.
* Level 5: The level became [[E1M6: Central Processing|E1M6 (Central Processing)]].
* Level 6: The level was not used in the final game; it is merely a starting slate made by Tom Hall, might have been "Personal Quarters".
* Level 7: In retail this level became [[E1M4: Command Control|Command Control (E1M4)]]. The level is based off of "Enlisted Quarters" in the Doom Bible, as there are lockers and showers on the left and right entrances.
* Level 8: Became [[E1M2: Nuclear Plant|E1M2 (Nuclear Plant)]]. Was known simply as "Power Plant" at this stage, straight from the Doom Bible, and was the basement of the Control Center area.
* Level 9: Ultimately became [[E3M3: Pandemonium|E3M3 (Pandemonium)]]. At this point in development the level has no Hell textures. This map is based on the concept for the ground floor of the Control Center/Power Plant area in the Doom Bible, as a sign on the left side says LAB, while the right side, with a sign pointing to WH1 (Warehouse One), leads to a dilapidated area. The two holes in the wall on the left and right sides of the stairs appear to be guard posts, as they have large red hands under them. Was to be the hub of the monorail transportation system, with the left corridor leading to the Laboratory map and the right corridor ultimately leading to the Warehouse map.
* Level 10: It has been argued the level might be a starting slate for Deimos Lab, [[E2M4: Deimos Lab|E2M4]]. However, this level was designed by [[John Romero]], whereas Deimos Lab was created by Tom Hall. Also, there is precious little present in the architecture to support the argument. Therefore others suggest the level later became [[E1M5: Phobos Lab|E1M5 (Phobos Lab)]], another Romero map. Nothing conclusive can be said, however, due to the small size of the map. Further, the small size have caused some to suggest the map was to become the "Observatory" map mentioned in the design document.
* Level 11: Designed by Tom Hall. Was meant to be the "Warehouse" reachable from Level 9, but was not used in the final game. At the time of the Doom Bible the level was still called "Supply Depot One".
* Level 12/13: Mentioned in the accompanying documentation, but were not actually included. If one is to follow the Doom Bible, these would have been "Main Hangar" and "Anomaly", respectively.

An aerial view of all the 13 levels, including their names, can be seen in the intermission screen of the next alpha version (v0.5).

==Gallery==

===Maps===

<gallery mode=nolines widths="240px" heights="240px">
Doom 0.4 e1m1.png|E1M1
Doom 0.4 e1m2.png|E1M2
Doom 0.4 e1m3.png|E1M3
Doom 0.4 e1m4.png|E1M4
Doom 0.4 e1m5.png|E1M5
Doom 0.4 e1m6.png|E1M6
Doom 0.4 e1m7.png|E1M7
Doom 0.4 e1m8.png|E1M8
Doom 0.4 e1m9.png|E1M9
Doom 0.4 e1m10.png|E1M10
Doom 0.4 e1m11.png|E1M11
</gallery>

===Items===
Several items mentioned in the Doom Bible are still present in this Alpha version of Doom. Additionally, items such as flags —albeit only as the lowest part of the stand— make their one and only appearance in this version. While the items do not have the corresponding code present, the graphics and sprite names, however, are.

<gallery mode=nolines widths="200px">
clip4.png|A [[bullet clip]].
rocketlauncher4.png|The [[rocket launcher]].
cell4.png|A shield generator from the [[Doom Bible]] and a [[medikit]].
syringe4.png|A stimpack.
chair4.png|Chairs.
barrels4.png|Barrels and a [[chainsaw]].
</gallery>

===Weapons===

<gallery mode=nolines widths="200px">
rifle4.png|The Rifle.
bayonette4.png|Thrusting the Bayonet.
</gallery>

==Technical==
[[File:Alpha ANSI DOOMERR.gif|thumb|250px|The DOOMERR message shown if the game did not have enough memory to load. This was not kept after the [[Doom v0.5|next beta]].]]
* The [[COLORMAP]] has still only 32 levels and the [[PLAYPAL]] only one, as in [[Doom v0.2|the previous alpha]]. Compared to the 0.2 palette, color ranges 3-8, 160-231 and 240-247 are changed to their final version. The remaining non-final colors (9-15, 232-239, 248 and 249) are replaced by pure white.
* VIEWINFO and HIGHBLIT have been removed.
* Two new lumps have appeared, COLORS12 and COLORS15. They are both 16384-byte long. COLORS12 is not referenced in the exe, and not used.
* Another new lump is HUFONT.
* The [[ENDOOM]] screen makes it first appearance. A similar ANSI text screen named DOOMERR is added.
* The engine now supports multiple maps. They must all be within M_START and M_END markers, and their name is given by a marker lump used as a header. The map format is completely different from both the previous and the final versions.
* The [[PNAMES]] and [[TEXTURE1 and TEXTURE2|TEXTURES]] lumps makes their appearance. In this version, the textures have no name and are presumably referred to by their index.
* The picture format of raw images with a header is abandoned, instead two new image formats make their entrance. The first (called "snea" by [[DeuTex]]) is an interleaved bitmap format where the width is always a multiple of four. The second is a raw 10x12 image used for the GNUM0 to GNUM9 lumps. The interface graphics (between L_START and L_END markers) are either in this "gnum" format, sneas, or the alpha [[picture format]].
* The rendering engine does not repeat textures on any given line, only the rightmost pixels of the texture will be repeated indefinitely until the line ends. Due to this limitation many of the textures are uncharacteristically wide.

== External links ==

* {{idgames|title=Doom 0.4|id=2}}
* [http://toastytech.com/dooma/alpha4.html A more thorough overview of the alpha]

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[[Category:Doom pre-release builds]]