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add anti aliasing option #1313

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add anti aliasing option #1313

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3 changes: 3 additions & 0 deletions h2d/RenderContext.hx
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Original file line number Diff line number Diff line change
Expand Up @@ -151,6 +151,9 @@ class RenderContext extends h3d.impl.RenderContext {
cameraStackIndex = 0;
filterStack = [];
filterStackIndex = 0;
#if anti_aliasing
globals.set("global.antiAliasing", 0);
#end
}

override function dispose() {
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6 changes: 6 additions & 0 deletions h3d/scene/RenderContext.hx
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Expand Up @@ -46,6 +46,9 @@ class RenderContext extends h3d.impl.RenderContext {
@global("global.modelViewInverse") var globalModelViewInverse : h3d.Matrix;
@global("global.previousModelView") var globalPreviousModelView : h3d.Matrix;
@global("global.frame") var globalFrame : Int;
#if anti_aliasing
@global("global.antiAliasing") var globalAntiAliasing : Int;
#end

var allocPool : h3d.pass.PassObject;
var allocFirst : h3d.pass.PassObject;
Expand All @@ -67,6 +70,9 @@ class RenderContext extends h3d.impl.RenderContext {
cachedShaderList = [];
cachedPassObjects = [];
initGlobals();
#if anti_aliasing
globalAntiAliasing = 0;
#end
}

public function setCamera( cam : h3d.Camera ) {
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20 changes: 20 additions & 0 deletions h3d/shader/Texture.hx
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Expand Up @@ -6,6 +6,12 @@ class Texture extends hxsl.Shader {
@input var input : {
var uv : Vec2;
};

#if anti_aliasing
@global var global: {
var antiAliasing: Int;
};
#end

@const var additive : Bool;
@const var killAlpha : Bool;
Expand All @@ -22,7 +28,21 @@ class Texture extends hxsl.Shader {
}

function fragment() {
#if anti_aliasing
var c = if (global.antiAliasing == 1) {
var dx = dFdx(input.uv);
var dy = dFdy(input.uv);
var c0 = texture.get(input.uv + 0.25 * dx + 0.25 * dy);
var c1 = texture.get(input.uv + 0.25 * dx - 0.25 * dy);
var c2 = texture.get(input.uv - 0.25 * dx + 0.25 * dy);
var c3 = texture.get(input.uv - 0.25 * dx - 0.25 * dy);
(c0 + c1 + c2 + c3) * 0.25;
} else {
texture.get(calculatedUV);
}
#else
var c = texture.get(calculatedUV);
#end
if( killAlpha && c.a - killAlphaThreshold < 0 ) discard;
if( additive )
pixelColor += c;
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