TorqueGameEngines/Torque3D
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largely based on work by @rextimmy: add premultiplied alpha

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This commit is contained in:
AzaezelX 2019-11-22 10:02:01 -06:00
parent c1e99364b7
commit bd21a207ef
6 changed files with 37 additions and 11 deletions
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1
Engine/source/materials/materialDefinition.cpp
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@ -82,6 +82,7 @@ ImplementEnumType( MaterialBlendOp,
"@ingroup GFX\n\n")
{ Material::None, "None", "Disable blending for this material." },
{ Material::Mul, "Mul", "Multiplicative blending." },
{ Material::PreMul, "PreMul", "Premultiplied alpha." },
{ Material::Add, "Add", "Adds the color of the material to the frame buffer with full alpha for each pixel." },
{ Material::AddAlpha, "AddAlpha", "The color is modulated by the alpha channel before being added to the frame buffer." },
{ Material::Sub, "Sub", "Subtractive Blending. Reverses the color model, causing dark colors to have a stronger visual effect." },

1
Engine/source/materials/materialDefinition.h
View file

@ -106,6 +106,7 @@ public:
{
None = 0,
Mul,
PreMul,
Add,
AddAlpha, // add modulated with alpha channel
Sub,

6
Engine/source/materials/processedMaterial.cpp
View file

@ -128,6 +128,12 @@ void ProcessedMaterial::_setBlendState(Material::BlendOp blendOp, GFXStateBlockD
desc.blendDest = GFXBlendInvSrcAlpha;
break;
}
case Material::PreMul:
{
desc.blendSrc = GFXBlendOne;
desc.blendDest = GFXBlendInvSrcAlpha;
break;
}
case Material::LerpAlpha:
{
desc.blendSrc = GFXBlendSrcAlpha;

4
Engine/source/shaderGen/GLSL/shaderFeatureGLSL.cpp
View file

@ -115,6 +115,10 @@ LangElement* ShaderFeatureGLSL::assignColor( LangElement *elem,
assign = new GenOp( "@ *= @", color, elem );
break;
case Material::PreMul:
assign = new GenOp("@.rgb = @.rgb + (@.rgb*(1.0-@.a))", color, elem, color, elem);
break;
case Material::AddAlpha:
assign = new GenOp( "@ += @ * @.a", color, elem, elem );
break;

4
Engine/source/shaderGen/HLSL/shaderFeatureHLSL.cpp
View file

@ -115,6 +115,10 @@ LangElement* ShaderFeatureHLSL::assignColor( LangElement *elem,
assign = new GenOp( "@ *= @", color, elem );
break;
case Material::PreMul:
assign = new GenOp("@.rgb = @.rgb + (@.rgb*(1.0-@.a))", color, elem, color, elem);
break;
case Material::AddAlpha:
assign = new GenOp( "@ += @ * @.a", color, elem, elem );
break;