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--- hardware:blitter_programming_model [2010/03/07 16:31]
gilgamesh created
+++ hardware:blitter_programming_model [2010/03/07 22:05] (current)
gilgamesh
@@ Line 2: / Line 2: @@
 ''BLTCON''
 ^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ ^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^
-|  ASH  |||| usea | useb | usec | used |  LF  |||||||| |  BSH  |||| 0|0|0|0| doff | 0|0| efe | ife | fci | desc | line |
+|  ASH  |||| usea | useb | usec | used |  LF  |||||||| |  BSH  |||| 0|0|0|0| doff | 0|0| efe | ife | fci | desc | 0 |
+(normal mode)
+  * ''ASH'': shift value of source A
+  * ''USEA'': use source A
+  * ''USEB'': use source B
+  * ''USEC'': use source C
+  * ''USED'': use destination D
+  * ''LF'': performed logic function minterm select lines
+  * ''BSH'': shift value of source B
+  * ''DOFF''
+  * ''EFE'': exclusive fill
+  * ''IFE'': inclusive fill
+  * ''FCI'': fill carry input
+  * ''DESC'': descending address mode
+^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ ^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^
+|  START  |||| 1 | 0 | 1 | 1 |  LF  |||||||| |  TEXTURE  |||| 0|0|0|0| sign | 0|0| sud | sul | aul | sing | 1 |
+(line mode)
+  * ''START'': sttarting point of line
+  * ''LF'': performed logic function minterm select lines
+  * ''TEXTURE'':
+  * ''SIGN'': sign flag
+  * ''SUD'': sometimes up or down
+  * ''SUL'': sometimes up or left
+  * ''AUL'': always up or left
+  * ''SING'':single bit per horizontal line (for filling)
+BLTSIZE, BLTSIZEV, BLTSIZEH
+^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^
+|  h  ||||||||||  w  ||||||
+  * ''h'': height in vertical lines
+  * ''w'': width in horizontal pixels
 ===== Blitter's Registers =====

hardware/blitter_programming_model.txt · Last modified: 2010/03/07 22:05 by gilgamesh

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