VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-125
3D Graphics Engine Registers
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Specular / Fog Start Value
The specular / fog start value is used for specular shading or
fogging.
DoubleWord 0 – Start Value
31-24 Initial Fog Value
Initial Fog value on main edge (left edge of trapezoid
or long edge of triangle). Unsigned integer.
23-16 Initial Red Value
Initial Red value on main edge (left edge of trapezoid
or long edge of triangle). Unsigned integer.
15-8 Initial Green Value
Initial Green value on main edge (left edge of
trapezoid or long edge of triangle). Unsigned integer.
7-0
Initial Blue Value
Initial Blue value on main edge (left edge of
trapezoid or long edge of triangle). Unsigned integer.
Specular Parameters
Specular parameters are used for specular shading.
These
parameters are not present in flat color mode and consist of
starting values incremental along the main direction ((dx, dy) =
(M1, 1)), and incremental along the X axis.
DoubleWord 0 – X-Axis Blue Gradient
31-0 X-Axis Blue Gradient
Gradient of Blue along the X axis over the primitive
surface. Signed 20.12 number.
DoubleWord 1 – Y-Axis Blue Gradient
31-0 Y-Axis Blue Gradient
Gradient of Blue along the Y axis over the primitive
surface. Signed 20.12 number.
DoubleWord 2 – X-Axis Green Gradient
31-0 X-Axis Green Gradient
Gradient of Green along the X axis over the primitive
surface. Signed 20.12 number.
DoubleWord 3 – Y-Axis Green Gradient
31-0 Y-Axis Green Gradient
Gradient of Green along the Y axis over the primitive
surface. Signed 20.12 number.
DoubleWord 4 – X-Axis Red Gradient
31-0 X-Axis Red Gradient
Gradient of Red along the X axis over the primitive
surface. Signed 20.12 number.
DoubleWord 5 – Y-Axis Red Gradient
31-0 Y-Axis Red Gradient
Gradient of Red along the Y axis over the primitive
surface. Signed 20.12 number.
Fog Parameters
Fog parameters are used for fogging. These parameters are
not present in flat color mode and consist of starting values
incremental along the X and Y axis.
DoubleWord 0 – X-Axis Fog Gradient
31-0 X-Axis Fog Gradient
Gradient of Fog along the X axis over the primitive
surface. Signed 20.12 number.
DoubleWord 1 – Y-Axis Fog Gradient
31-0 Y-Axis Fog Gradient
Gradient of Fog along the Y axis over the primitive
surface. Signed 20.12 number.
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