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Pipeline color blend state attachment (used by RenderingDevice).
 Controls how blending between source and destination fragments is performed when using RenderingDevice.
For reference, this is how common user-facing blend modes are implemented in Godot's 2D renderer:
Mix:
var attachment = RDPipelineColorBlendStateAttachment.new() attachment.enable_blend = true attachment.color_blend_op = RenderingDevice.BLEND_OP_ADD attachment.src_color_blend_factor = RenderingDevice.BLEND_FACTOR_SRC_ALPHA attachment.dst_color_blend_factor = RenderingDevice.BLEND_FACTOR_ONE_MINUS_SRC_ALPHA attachment.alpha_blend_op = RenderingDevice.BLEND_OP_ADD attachment.src_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_ONE attachment.dst_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_ONE_MINUS_SRC_ALPHA
Add:
var attachment = RDPipelineColorBlendStateAttachment.new() attachment.enable_blend = true attachment.alpha_blend_op = RenderingDevice.BLEND_OP_ADD attachment.color_blend_op = RenderingDevice.BLEND_OP_ADD attachment.src_color_blend_factor = RenderingDevice.BLEND_FACTOR_SRC_ALPHA attachment.dst_color_blend_factor = RenderingDevice.BLEND_FACTOR_ONE attachment.src_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_SRC_ALPHA attachment.dst_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_ONE
Subtract:
var attachment = RDPipelineColorBlendStateAttachment.new() attachment.enable_blend = true attachment.alpha_blend_op = RenderingDevice.BLEND_OP_REVERSE_SUBTRACT attachment.color_blend_op = RenderingDevice.BLEND_OP_REVERSE_SUBTRACT attachment.src_color_blend_factor = RenderingDevice.BLEND_FACTOR_SRC_ALPHA attachment.dst_color_blend_factor = RenderingDevice.BLEND_FACTOR_ONE attachment.src_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_SRC_ALPHA attachment.dst_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_ONE
Multiply:
var attachment = RDPipelineColorBlendStateAttachment.new() attachment.enable_blend = true attachment.alpha_blend_op = RenderingDevice.BLEND_OP_ADD attachment.color_blend_op = RenderingDevice.BLEND_OP_ADD attachment.src_color_blend_factor = RenderingDevice.BLEND_FACTOR_DST_COLOR attachment.dst_color_blend_factor = RenderingDevice.BLEND_FACTOR_ZERO attachment.src_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_DST_ALPHA attachment.dst_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_ZERO
Pre-multiplied alpha:
var attachment = RDPipelineColorBlendStateAttachment.new() attachment.enable_blend = true attachment.alpha_blend_op = RenderingDevice.BLEND_OP_ADD attachment.color_blend_op = RenderingDevice.BLEND_OP_ADD attachment.src_color_blend_factor = RenderingDevice.BLEND_FACTOR_ONE attachment.dst_color_blend_factor = RenderingDevice.BLEND_FACTOR_ONE_MINUS_SRC_ALPHA attachment.src_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_ONE attachment.dst_alpha_blend_factor = RenderingDevice.BLEND_FACTOR_ONE_MINUS_SRC_ALPHA
set get int alpha_blend_op<>():int set get
The blend mode to use for the alpha channel.

set get int color_blend_op<>():int set get
The blend mode to use for the red/green/blue color channels.

set get int dst_alpha_blend_factor<>():int set get
Controls how the blend factor for the alpha channel is determined based on the destination's fragments.

set get int dst_color_blend_factor<>():int set get
Controls how the blend factor for the color channels is determined based on the destination's fragments.

set get bool enable_blend<>():bool set get
If true, performs blending between the source and destination according to the factors defined in src_color_blend_factor, dst_color_blend_factor, src_alpha_blend_factor and dst_alpha_blend_factor. The blend modes color_blend_op and alpha_blend_op are also taken into account, with write_r, write_g, write_b and write_a controlling the output.

set get int src_alpha_blend_factor<>():int set get
Controls how the blend factor for the alpha channel is determined based on the source's fragments.

set get int src_color_blend_factor<>():int set get
Controls how the blend factor for the color channels is determined based on the source's fragments.

set get bool write_a<>():bool set get
If true, writes the new alpha channel to the final result.

set get bool write_b<>():bool set get
If true, writes the new blue color channel to the final result.

set get bool write_g<>():bool set get
If true, writes the new green color channel to the final result.

set get bool write_r<>():bool set get
If true, writes the new red color channel to the final result.

void set_as_mix<>():void
Convenience method to perform standard mix blending with straight (non-premultiplied) alpha. This sets enable_blend to true, src_color_blend_factor to [constant RenderingDevice.BLEND_FACTOR_SRC_ALPHA], dst_color_blend_factor to [constant RenderingDevice.BLEND_FACTOR_ONE_MINUS_SRC_ALPHA], src_alpha_blend_factor to [constant RenderingDevice.BLEND_FACTOR_SRC_ALPHA] and dst_alpha_blend_factor to [constant RenderingDevice.BLEND_FACTOR_ONE_MINUS_SRC_ALPHA].




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