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BLEND

Description

These enums are used by render.OverrideBlend to determine what the Source and Destination color and alpha channel values for a given pixel will be multiplied by before they are sent to the Blend Function to calculate the pixel's final color during draw operations.

For an interactive demonstration of how these enums behave, see Anders Riggelsen's Visual glBlendFunc Tool here

image.png

Values

BLEND_ZERO0The Multiplier will be r=0, g=0, b=0, a=0

This is useful for removing the Source or Destination from the final pixel color.

BLEND_ONE1The Multiplier will be r=1, g=1, b=1, a=1

This is useful for keeping the Source or Destination as their starting values.

BLEND_DST_COLOR2The Multiplier will be the same as the Destination color and alpha.
BLEND_ONE_MINUS_DST_COLOR3Each color and alpha channel value of the Destination is subtracted from 1.

Example:
If your Destination channels are: r=1, g=0.25, b=0.1, a=1
They will be modified by: r=1-1, g=1-0.25, b=1-0.1, a=1-1
The final Multiplier value will be: r=0, g=0.75, b=0.9, a=0

BLEND_SRC_ALPHA4All color and alpha channels will be the same as the Source alpha value.

Example:
If your Source channels are: r=0.1, g=0, b=1, a=0.5
The final Multiplier value will be: r=0.5, g=0.5, b=0.5, a=0.5

BLEND_ONE_MINUS_SRC_ALPHA5All color and alpha channels will be set to the Source alpha value subtracted from 1.

Example:
If your Source channels are: r=0, g=0.23, b=1, a=0.6
The alpha channel will be modified by a=1-0.6
The final Multiplier value will be: r=0.4, g=0.4, b=0.4, a=0.4

BLEND_DST_ALPHA6All color and alpha channels will be set to the the Destination alpha value.

Example:
If your Destination channels are: r=0.1, g=0, b=1, a=0.5
The final Multiplier value will be: r=0.5, g=0.5, b=0.5, a=0.5

BLEND_ONE_MINUS_DST_ALPHA7All color and alpha channels will be set to the Destination alpha value subtracted from 1.

Example:
If your Destination channels are: r=0, g=0.23, b=1, a=0.6
The alpha channel will be modified by a=1-0.6
The final Multiplier value will be: r=0.4, g=0.4, b=0.4, a=0.4

BLEND_SRC_ALPHA_SATURATE8First, the Source alpha is compared against the Destination alpha value subtracted from 1 and the smaller of the two is kept.

Then, the Source color channels are multiplied by the value from the first step.

The Source alpha channel is multiplied by 1.

Example:
If your Source channels are: r=1, g=0.25, b=0.1, a=0.6
and your Destination channels are: r=0, g=1, b=0.5, a=0.75

The Destination alpha value subtracted from 1 is calculated: 1-0.75 = 0.25
The Source alpha 0.6 is compared to the subtracted Destination alpha 0.25 and the smaller of the two is kept (0.25)

The color channels of the Source are multiplied by the smaller value: r=1*0.25, g=0.25*0.25, b=0.1*0.25

The final Multiplier value will be r=0.25, g=0.0625, b=0.025, a=0.6

BLEND_SRC_COLOR9The Multiplier will be the same as the Source color and alpha.
BLEND_ONE_MINUS_SRC_COLOR10Each color and alpha channel value of the Source is subtracted from 1.

Example:
If your Source channels are: r=1, g=0.25, b=0.1, a=1
They will be modified by: r=1-1, g=1-0.25, b=1-0.1, a=1-1
The final Multiplier value will be: r=0, g=0.75, b=0.9, a=0

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