Commodore Amiga - Page 13

Figures
Figure 2-1 Interlaced Bit-Plane in RAM - 400 Lines Long ................................................................. 23
Figure 3-1 How the Video Display Picture Is Produced ...................................................................... 29
Figure,3-2 What Is a Pixel? ................................................................................................................................... 30
Figure 3-3 How Bit-planes Select a Color ..................................................................................................... 32
, Figure 3-4 Significance of Bit-Plane Data in Selecting Colors ......................................................... 33
Figure 3-5 Interlacing ................................................................................................................................................ 39
Figure 3-6 Effect of Interlaced Mode on Edges of Objects ................................................................. 40
Figure 3-7 Memory Organization for a Basic Bit-Plane ....................................................................... 43
Figure 3-8 Combining Bit-planes ....................................................................................................................... 45
Figure 3-9 Positioning the On-screen Display .............................................. __ ........................................... 47
Figure 3-10 Data Fetched for the First Line When Modulo = 0 ......................................... .-...... 50
Figure 3-11 Data Fetched for the Second Line When Modulo = 0 ............................................. 51
Figure 3-12 A Dual-playfield Display .............................................................................................................. 59
Figure 3-13 How Bit-Planes Are Assigned to Dual Playfields .......................................................... 61
Figure 3-14 Memory Picture Larger than the Display .......................................................................... 66
Figure 3-15 Data Fetch for the First Line When Modulo = 40..................................................... 67
Figure 3-16 Data Fetch for the Second Line When Modulo = 40 ................................................ 67
Figure 3-17 Data Layout for First Line-Right Half of Big Picture ............................................ 68
Figure 3-18 Data Layout for Second Line-Right Half of Big Picture ....................................... 68
Figure 3-19 Display Window Horizontal Starting Position ................................................................ 70
Figure 3-20 Display Window Vertical Starting Position ..................................................................... 70
Figure 3-21 Display Window Horizontal Stopping Position .............................................................. 71
Figure 3-22 Display Window Vertical Stopping Position .................................................................... 72
Figure 3-23 Vertical Scrolling .............................................................................................................................. 74
Figure 3-24 Horizontal Scrolling ......................................................................................................................... 75
Figure 3-25 Memory Picture Larger Than the Display Window.................................................... 77
Figure 3-26 Data for Line 1 - Horizontal Scrolling ................................................................................. 77
Figure 3-27 Data for Line 2 - Horizontal Scrolling ................................................................................. 77
Figure 4-1 Defining Sprite On-screen Position .......................................................................................... 93
Figure 4-2 Position of Sprites .............................................................................................................................. 94
Figure 4-3 Shape of Spaceship ............................................................................................................................. 96
Figure 4-4 Sprite with Spaceship Shape Defined ..................................................................................... 96
Figure 4-5 Sprite Color Definition ..................................................................................................................... 97
Figure 4-6 Color Register Assignments .......................................................................................................... 98
Figure 4-7 Data Structure Layout .................................................................................................................... 101
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