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Difference between revisions of "AGI/Specifications/Other/AGI256/Implementation Details"
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AGI/Specifications/Other/AGI256/Implementation Details (view source)
Revision as of 09:39, 17 July 2007
, 09:39, 17 July 2007Memory buffer is 168 in height, not 200. Fixed.
(Added info on cel blitting modification and loading 256-color picture resources.) |
(Memory buffer is 168 in height, not 200. Fixed.) |
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| Line 1: | Line 1: | ||
In the original PC AGI interpreter v2.936 the engine holds the color and priority/control | In the original PC AGI interpreter v2.936 the engine holds the color and priority/control | ||
line information for each pixel in a | line information for each pixel in a 160x168 byte buffer. The color data for each pixel | ||
is held in the byte's lower 4 bits and the priority/control line data is held in the upper | is held in the byte's lower 4 bits and the priority/control line data is held in the upper | ||
4 bits. | 4 bits. | ||
AGI256 extends this | AGI256 extends this 160x168 byte buffer to a 320x168 byte buffer so that the 256-color | ||
data is held in the right | data is held in the right 160x168 half of the buffer and the original style 16-color and | ||
priority/control line information is held in the left | priority/control line information is held in the left 160x168 half of the buffer. | ||
When loading 256-color picture resource with the unknown170 command | When loading 256-color picture resource with the unknown170 command | ||