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Add remaining additive blends (flutter/engine#76)

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This commit is contained in:
Brandon DeRosier 2022-03-14 14:28:04 -07:00 committed by Dan Field
parent 39c77c422f
commit 9f1bc52214
3 changed files with 83 additions and 2 deletions
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53
engine/src/flutter/impeller/entity/contents/content_context.h
View File

@ -159,12 +159,61 @@ class ContentContext {
color0.src_alpha_blend_factor = BlendFactor::kOneMinusDestinationAlpha;
color0.src_color_blend_factor = BlendFactor::kOneMinusDestinationAlpha;
break;
case Entity::BlendMode::kPlus:
case Entity::BlendMode::kSourceIn:
color0.dst_alpha_blend_factor = BlendFactor::kZero;
color0.dst_color_blend_factor = BlendFactor::kZero;
color0.src_alpha_blend_factor = BlendFactor::kDestinationAlpha;
color0.src_color_blend_factor = BlendFactor::kDestinationAlpha;
break;
case Entity::BlendMode::kDestinationIn:
color0.dst_alpha_blend_factor = BlendFactor::kSourceAlpha;
color0.dst_color_blend_factor = BlendFactor::kSourceAlpha;
color0.src_alpha_blend_factor = BlendFactor::kZero;
color0.src_color_blend_factor = BlendFactor::kZero;
break;
case Entity::BlendMode::kSourceOut:
color0.dst_alpha_blend_factor = BlendFactor::kZero;
color0.dst_color_blend_factor = BlendFactor::kZero;
color0.src_alpha_blend_factor = BlendFactor::kOneMinusDestinationAlpha;
color0.src_color_blend_factor = BlendFactor::kOneMinusDestinationAlpha;
break;
case Entity::BlendMode::kDestinationOut:
color0.dst_alpha_blend_factor = BlendFactor::kOneMinusSourceAlpha;
color0.dst_color_blend_factor = BlendFactor::kOneMinusSourceAlpha;
color0.src_alpha_blend_factor = BlendFactor::kZero;
color0.src_color_blend_factor = BlendFactor::kZero;
break;
case Entity::BlendMode::kSourceATop:
color0.dst_alpha_blend_factor = BlendFactor::kOneMinusSourceAlpha;
color0.dst_color_blend_factor = BlendFactor::kOneMinusSourceAlpha;
color0.src_alpha_blend_factor = BlendFactor::kDestinationAlpha;
color0.src_color_blend_factor = BlendFactor::kDestinationAlpha;
break;
case Entity::BlendMode::kDestinationATop:
color0.dst_alpha_blend_factor = BlendFactor::kSourceAlpha;
color0.dst_color_blend_factor = BlendFactor::kSourceAlpha;
color0.src_alpha_blend_factor = BlendFactor::kOneMinusDestinationAlpha;
color0.src_color_blend_factor = BlendFactor::kOneMinusDestinationAlpha;
break;
case Entity::BlendMode::kXor:
color0.dst_alpha_blend_factor = BlendFactor::kOneMinusSourceAlpha;
color0.dst_color_blend_factor = BlendFactor::kOneMinusSourceAlpha;
color0.src_alpha_blend_factor = BlendFactor::kOneMinusDestinationAlpha;
color0.src_color_blend_factor = BlendFactor::kOneMinusDestinationAlpha;
break;
case Entity::BlendMode::kPlus:
color0.dst_alpha_blend_factor = BlendFactor::kOne;
color0.dst_color_blend_factor = BlendFactor::kOne;
color0.src_alpha_blend_factor = BlendFactor::kSourceAlpha;
color0.src_alpha_blend_factor = BlendFactor::kOne;
color0.src_color_blend_factor = BlendFactor::kOne;
break;
case Entity::BlendMode::kModulate:
// kSourceColor and kDestinationColor override the alpha blend factor.
color0.dst_alpha_blend_factor = BlendFactor::kZero;
color0.dst_color_blend_factor = BlendFactor::kSourceColor;
color0.src_alpha_blend_factor = BlendFactor::kZero;
color0.src_color_blend_factor = BlendFactor::kZero;
break;
}
desc.SetColorAttachmentDescriptor(0u, std::move(color0));
}

8
engine/src/flutter/impeller/entity/entity.h
View File

@ -27,7 +27,15 @@ class Entity {
kDestination,
kSourceOver,
kDestinationOver,
kSourceIn,
kDestinationIn,
kSourceOut,
kDestinationOut,
kSourceATop,
kDestinationATop,
kXor,
kPlus,
kModulate,
};
Entity();

24
engine/src/flutter/impeller/entity/entity_unittests.cc
View File

@ -522,9 +522,33 @@ TEST_F(EntityTest, BlendingModeOptions) {
case Entity::BlendMode::kDestinationOver:
blend_mode_names.push_back("DestinationOver");
blend_mode_values.push_back(Entity::BlendMode::kDestinationOver);
case Entity::BlendMode::kSourceIn:
blend_mode_names.push_back("SourceIn");
blend_mode_values.push_back(Entity::BlendMode::kSourceIn);
case Entity::BlendMode::kDestinationIn:
blend_mode_names.push_back("DestinationIn");
blend_mode_values.push_back(Entity::BlendMode::kDestinationIn);
case Entity::BlendMode::kSourceOut:
blend_mode_names.push_back("SourceOut");
blend_mode_values.push_back(Entity::BlendMode::kSourceOut);
case Entity::BlendMode::kDestinationOut:
blend_mode_names.push_back("DestinationOut");
blend_mode_values.push_back(Entity::BlendMode::kDestinationOut);
case Entity::BlendMode::kSourceATop:
blend_mode_names.push_back("SourceATop");
blend_mode_values.push_back(Entity::BlendMode::kSourceATop);
case Entity::BlendMode::kDestinationATop:
blend_mode_names.push_back("DestinationATop");
blend_mode_values.push_back(Entity::BlendMode::kDestinationATop);
case Entity::BlendMode::kXor:
blend_mode_names.push_back("Xor");
blend_mode_values.push_back(Entity::BlendMode::kXor);
case Entity::BlendMode::kPlus:
blend_mode_names.push_back("Plus");
blend_mode_values.push_back(Entity::BlendMode::kPlus);
case Entity::BlendMode::kModulate:
blend_mode_names.push_back("Modulate");
blend_mode_values.push_back(Entity::BlendMode::kModulate);
};
}