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| Line 490: |
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| <span id="Extensions"></span> | | <span id="Extensions"></span> |
| =Fan-Made Extensions=
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| ==AGIPAL==
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| AGIPAL uses the [[AGI/Specifications/Logic#Other_commands | shake.screen]] command to call an external file which changes the palette. The range of palette files is 100-109.
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|
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| <syntax type="C++">
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| shake.screen(101)
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| </syntax>
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|
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| That command would use the palette in pal.101, instead of shaking the screen 101 times under the AGIPAL interpreter.
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|
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| ===pal.* Format===
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| There are always eight 24-byte chunks, so the file is always 192 bytes.
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| <pre>
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| Chunk0 Holds RGB palette data for the first 8 colors (R0, G0, B0, R1, G1, B1, R2, G2, B2, ...)
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| Chunk1 Same as Chunk0
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| Chunk2 Holds RGB palette data for the second 8 colors (R8, G8, B8, R9, G9, B9, R10, G10, B10, ...)
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| Chunk3 Same as Chunk2
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| Chunk4-Chunk7 Same as Chunk0-Chunk3
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| </pre>
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|
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| Because VGA used 18-bit colors (i.e. 6 bits per color component) only the lowest 6 bits of each color component are actually used
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| (i.e. the topmost two bits of each color component byte are simply discarded).
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|
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| ==AGI256==
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| AGI256 is a hack to AGI interpreter v2.936 to add 256-color picture resource support.
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|
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| The AGI256 hack was originally made by Dark Minister.
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|
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| AGI256 uses the [[AGI/Specifications/Logic#Other_commands_2 | unknown170(n)]]
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| a.k.a. set.simple(n) command to load 256-color picture resources.
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| The parameter n is the variable's number that holds the picture resource's number.
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|
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| Example of use:
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| <syntax type="C++">
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| v123 = 10
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| unknown170(v123)
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| </syntax>
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| That would load the picture resource number 10 as a 256-color picture resource.
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| Any variable can be used with unknown170, v123 was just chosen for this example.
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|
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| ===256-color picture resource format===
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| <pre>
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| Data : Simply a raw 256-color 160x168 size picture, one byte per pixel.
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| Length : Always 160*168*1 = 26880 bytes.
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| Palette : Isn't saved in the file. Uses the default VGA palette.
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| </pre>
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|
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| As AGI256 was hacked to a v2.936 AGI interpreter no compression is used on
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| the picture resource data (Only v3 AGI interpreters use compression).
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|
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| ===Implementation details===
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|
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| See the [[AGI/Specifications/Other/AGI256/Implementation_Details | AGI256 Implementation Details]] page.
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|
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| ===External links===
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|
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| [http://agisci.classicgaming.gamespy.com/agi256.shtml How to use AGI256]<br>
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| [http://dl.fileplanet.com/dl/dl.asp?ClassicGaming/agisci/agi-256c.zip The AGI256 demo]<br>
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| [http://agisci.classicgaming.gamespy.com/agiutil.shtml#PictureTools AGI Picture Tools (Some support AGI256)]<br>
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| [http://agisci.classicgaming.gamespy.com/txt/unknown.txt An example of unknown170 command use]<br>
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| [http://www.agidev.com/download/#cat4 Sierra's original v2.936 AGI interpreter (Among other things)]<br>
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| [http://en.wikipedia.org/wiki/Video_Graphics_Array#The_VGA_color_palette The default VGA palette]
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|
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| ==AGI256-2==
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| AGI256-2 is an extension to AGI256 to further add 256-color view support.
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|
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| The AGI256-2 hack was originally made by Brian Provinciano.
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|
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| AGI256-2 uses a modified cel blitting routine so that it can handle view data
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| that isn't run length encoded and has 256 colors.
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|
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| AGI256-2 uses the same palette as AGI256 i.e. the default VGA palette.
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|
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| ===256-color view resource format===
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| Like the v2 AGI [[AGI/Specifications/View#VIEW_resources | view resources]] but with the following differences:
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|
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| * [[AGI/Specifications/View#View_header_.287.2B_bytes.29 | View header]] starts with bytes 0x0F, 0xF0
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| ** Can be used for detecting 256-color view resources
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| * Doesn't support mirroring
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| ** Transparency and cel mirroring byte in [[AGI/Specifications/View#Cel_header_.283_bytes.29 | cel header]] is used solely for choosing the transparent color
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| * Cel data is not run length encoded
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| ** Cel data is raw 256-color data, one byte per pixel
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| *** NOTE though that 0x00 for a new line is still supported
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|
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| ===Implementation details===
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|
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| See the [[AGI/Specifications/Other/AGI256-2/Implementation_Details | AGI256-2 Implementation Details]] page.
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|
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| ===External links===
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|
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| [http://dl.fileplanet.com/dl/dl.asp?ClassicGaming/agisci/agi256-2.zip The AGI256-2 demo]<br>
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| [http://agisci.classicgaming.gamespy.com/agiutil.shtml#ViewTools AGI View Tools (Some support AGI256-2)]<br>
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| [http://en.wikipedia.org/wiki/Video_Graphics_Array#The_VGA_color_palette The default VGA palette]<br>
| |