RDPipelineColorBlendStateAttachment

继承： RefCounted < Object

管线颜色混合状态附件（由 RenderingDevice 使用）。

描述

控制使用 RenderingDevice 时如何在来源和目标片段之间进行混合。

以下是常见面向用户的混合模式在 Godot 的 2D 渲染器中的实现方法，仅供参考：

混合：

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

加：

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

减：

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

乘：

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

预乘 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

属性

方法

属性说明

BlendOperation alpha_blend_op = 0 🔗

• void set_alpha_blend_op(value: BlendOperation)

• BlendOperation get_alpha_blend_op()

Alpha 通道使用的混合模式。

BlendOperation color_blend_op = 0 🔗

• void set_color_blend_op(value: BlendOperation)

• BlendOperation get_color_blend_op()

红、绿、蓝通道使用的混合模式。

BlendFactor dst_alpha_blend_factor = 0 🔗

• void set_dst_alpha_blend_factor(value: BlendFactor)

• BlendFactor get_dst_alpha_blend_factor()

控制如何根据目标片段确定 Alpha 通道的混合系数。

BlendFactor dst_color_blend_factor = 0 🔗

• void set_dst_color_blend_factor(value: BlendFactor)

• BlendFactor get_dst_color_blend_factor()

控制如何根据目标片段确定颜色通道的混合系数。

bool enable_blend = false 🔗

• void set_enable_blend(value: bool)

• bool get_enable_blend()

如果为 true，则会根据 src_color_blend_factor、dst_color_blend_factor、src_alpha_blend_factor 和 dst_alpha_blend_factor 中定义的系数对来源和目标进行混合。同时也会考虑 color_blend_op 和 alpha_blend_op 混合模式，write_r、write_g、write_b 和 write_a 则控制的是输出。

BlendFactor src_alpha_blend_factor = 0 🔗

• void set_src_alpha_blend_factor(value: BlendFactor)

• BlendFactor get_src_alpha_blend_factor()

控制如何根据来源片段确定 Alpha 通道的混合系数。

BlendFactor src_color_blend_factor = 0 🔗

• void set_src_color_blend_factor(value: BlendFactor)

• BlendFactor get_src_color_blend_factor()

控制如何根据来源片段确定颜色通道的混合系数。

bool write_a = true 🔗

• void set_write_a(value: bool)

• bool get_write_a()

如果为 true，则将新的 Alpha 通道写入最终结果。

bool write_b = true 🔗

• void set_write_b(value: bool)

• bool get_write_b()

如果为 true，则将新的蓝色通道写入最终结果。

bool write_g = true 🔗

• void set_write_g(value: bool)

• bool get_write_g()

如果为 true，则将新的绿色通道写入最终结果。

bool write_r = true 🔗

• void set_write_r(value: bool)

• bool get_write_r()

如果为 true，则将新的红色通道写入最终结果。

方法说明

void set_as_mix() 🔗

使用普通（非预乘）Alpha 进行标准混合混合（mix blending）的简便方法。这个方法会将 enable_blend 设为 true，将 src_color_blend_factor 设为 RenderingDevice.BLEND_FACTOR_SRC_ALPHA，将 dst_color_blend_factor 设为 RenderingDevice.BLEND_FACTOR_ONE_MINUS_SRC_ALPHA，将 src_alpha_blend_factor 设为 RenderingDevice.BLEND_FACTOR_SRC_ALPHA，将 dst_alpha_blend_factor 设为 RenderingDevice.BLEND_FACTOR_ONE_MINUS_SRC_ALPHA。