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Land SYSTEM4-rooted Godot boot

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gamer147
2026-07-20 18:13:32 -04:00
parent 7250de7fea
commit 097473fe16
18 changed files with 385 additions and 111 deletions
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3
engine/Age.Engine/Model/BlendKind.cs
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@@ -1,6 +1,5 @@
namespace Age.Engine.Model;
/// <summary>How an object's surface composites onto the canvas. Opaque = straight copy; Alpha = source-alpha
/// blend (fades). Additive (glow/flash, native blit mode 2/3) is a documented seam — NOT implemented in the
/// blend/transparency slice; see docs/superpowers/specs/2026-07-08-blend-transparency-design.md.</summary>
/// blend (fades); Additive = native SRCALPHA/ONE glow composition.</summary>
public enum BlendKind { Opaque, Alpha, Additive }

11
engine/Age.Engine/Model/GfxState.cs
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@@ -665,10 +665,15 @@ public sealed class GfxState
{
var (a, r, g, b) = BlendMath.UnpackArgb(sampledColor);
tint = ((long)r << 16) | ((long)g << 8) | (long)b;
if (o.StaticColorMode == 1 || (o.StaticColorMode == 0 && o.OneShotColorBlend))
if (o.StaticColorMode == 1)
{
// Native mode 1 enables SRCALPHA/ONE additive blending and passes packed ARGB as
// D3D modulation. Black therefore contributes nothing (TITLE's SO022 flames),
// while the high byte scales the additive source contribution.
alpha = a; strength = 0; blend = BlendKind.Additive; multiplyTint = true;
}
else if (o.StaticColorMode == 0 && o.OneShotColorBlend)
{
// Native mode 1 enables SRCALPHA/INVSRCALPHA and passes packed ARGB as D3D
// modulation. Its high byte is opacity, not mode-0 tint/fill strength.
alpha = a; strength = 0; blend = BlendKind.Alpha; multiplyTint = true;
}
else if (o.StaticColorMode == 2)

19
engine/Age.Engine/Model/SoftwareAffineRasterizer.cs
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@@ -5,7 +5,8 @@ public static class SoftwareAffineRasterizer
{
public static void BlitRgba(byte[] dst, int dstW, int dstH, byte[] src, int srcW, int srcH,
int srcX, int srcY, int width, int height, Affine2D localToDest,
long tint, float tintStrength, float opacity, bool multiplyTint = false)
long tint, float tintStrength, float opacity, bool multiplyTint = false,
BlendKind blend = BlendKind.Alpha)
{
if (width <= 0 || height <= 0) return;
int istr = (int)(System.Math.Clamp(tintStrength, 0f, 1f) * 255);
@@ -15,7 +16,7 @@ public static class SoftwareAffineRasterizer
if (TryIntegerTranslation(localToDest, out int tx, out int ty))
{
BlitTranslated(dst, dstW, dstH, src, srcW, srcX, srcY, width, height,
tx, ty, tr, tg, tb, istr, ia, multiplyTint);
tx, ty, tr, tg, tb, istr, ia, multiplyTint, blend);
return;
}
if (!localToDest.TryInverse(out var inv)) return;
@@ -30,7 +31,7 @@ public static class SoftwareAffineRasterizer
int sr=multiplyTint ? src[si]*tr/255 : (src[si]*(255-istr)+tr*istr)/255;
int sg=multiplyTint ? src[si+1]*tg/255 : (src[si+1]*(255-istr)+tg*istr)/255;
int sb=multiplyTint ? src[si+2]*tb/255 : (src[si+2]*(255-istr)+tb*istr)/255;
Blend(dst,di,sr,sg,sb,sa);
Blend(dst,di,sr,sg,sb,sa,blend);
}
}
@@ -67,7 +68,8 @@ public static class SoftwareAffineRasterizer
private static void BlitTranslated(byte[] dst, int dstW, int dstH, byte[] src, int srcW,
int srcX, int srcY, int width, int height, int tx, int ty,
int tr, int tg, int tb, int istr, int ia, bool multiplyTint)
int tr, int tg, int tb, int istr, int ia, bool multiplyTint,
BlendKind blend)
{
int x0 = System.Math.Max(0, tx), y0 = System.Math.Max(0, ty);
int x1 = (int)System.Math.Min(dstW, (long)tx + width);
@@ -84,7 +86,7 @@ public static class SoftwareAffineRasterizer
int sr = multiplyTint ? src[si] * tr / 255 : (src[si] * (255 - istr) + tr * istr) / 255;
int sg = multiplyTint ? src[si + 1] * tg / 255 : (src[si + 1] * (255 - istr) + tg * istr) / 255;
int sb = multiplyTint ? src[si + 2] * tb / 255 : (src[si + 2] * (255 - istr) + tb * istr) / 255;
Blend(dst, di, sr, sg, sb, sa);
Blend(dst, di, sr, sg, sb, sa, blend);
}
}
}
@@ -108,7 +110,12 @@ public static class SoftwareAffineRasterizer
x1=System.Math.Min(dw,(int)System.Math.Ceiling(System.Math.Max(System.Math.Max(a.X,b.X),System.Math.Max(c.X,d.X))));
y1=System.Math.Min(dh,(int)System.Math.Ceiling(System.Math.Max(System.Math.Max(a.Y,b.Y),System.Math.Max(c.Y,d.Y))));
}
private static void Blend(byte[] d,int i,int r,int g,int b,int a){
private static void Blend(byte[] d,int i,int r,int g,int b,int a,BlendKind blend=BlendKind.Alpha){
if(blend==BlendKind.Additive){
d[i]=(byte)System.Math.Min(255,d[i]+r*a/255);d[i+1]=(byte)System.Math.Min(255,d[i+1]+g*a/255);
d[i+2]=(byte)System.Math.Min(255,d[i+2]+b*a/255);d[i+3]=(byte)System.Math.Min(255,d[i+3]+a);
return;
}
d[i]=(byte)((r*a+d[i]*(255-a))/255);d[i+1]=(byte)((g*a+d[i+1]*(255-a))/255);
d[i+2]=(byte)((b*a+d[i+2]*(255-a))/255);d[i+3]=(byte)System.Math.Min(255,d[i+3]+a);
}