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MB86R02 ‘Jade-D’ Hardware Manual V1.64
18.4.2 Configuration
The MB86R02 'Jade-D' uses local external memory (graphics memory) for drawing and
display management. The configuration of this graphics memory is described below.
18.4.3 Data Type
The MB86R02 'Jade-D' handles the types of data described below. Display lists can also be
stored in the host (main) memory. Texture/tile patterns and text patterns can also be defined by
a display list.
Drawing Frame
This is a rectangular image data field for 2D/3D drawing. The MB86R02 'Jade-D' can have
multiple drawing frames and display only a part of these areas if they are configured larger than
the display size. The maximum size is 4096x4096 pixel in 32 pixel units. Both indirect color (8
bits / pixel) and direct color (16 bits / pixel) modes are available.
Display Frame
This is a rectangle picture area used for display. The MB86R02 'Jade-D' is able to use up to 6
display layers.
Z Buffer
A Z buffer is required for the elimination of hidden surfaces. In 16 bit modes, 2 bytes are
required per pixel and in 8 bits mode, 1 byte is required per pixel. This area must be cleared
before drawing.
Polygon Drawing Flag Buffer
This area is used for polygon drawing. It requires 1 bit of the memory area per pixel and 1 x-axis
line area both in front and behind it. This area must be cleared before use.
In the specific case of using a polygon with a shadow, the required area depends on the
geometry view volume clip parameter. (Normally dependa on the drawing clipping parameter)
Above “Y resolution” is “Possible_view_clipped_Max_Ydc -
Possible_view_clipped_1+6”. (+6 margin is required)
Displaylist Buffer
The displaylist is a list of drawing commands and parameters.
Texture Pattern
This pattern is used for texture mapping. The maximum size is up to 4096 x 4096 pixels.
Frame buffer, Z buffer,
Displaylist and etc
By XRES size
By drawing frame sizy
By XRES size
Frame buffer, Z buffer,
Displaylist and etc
Polygon drawing flag area
=>
(Y reso 2) * X resolution
Base Address of Polygon
Drawing Buffer(PFBR)
Содержание MB86R02
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