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Implement legacy black surface fades

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gamer147
2026-07-29 10:40:38 -04:00
parent e33a6d1db3
commit df9918c744
10 changed files with 124 additions and 23 deletions
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12
engine/Age.Engine/Hosting/IHost.cs
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@@ -28,6 +28,12 @@ public readonly record struct SurfaceRectCopy(
int SourceSurface, int DestinationSurface, int SourceX, int SourceY,
int Width, int Height, int DestinationX, int DestinationY);
public enum SurfaceBlackFadeDirection
{
FromBlack,
ToBlack,
}
public interface IHost
{
/// <summary>Report a recoverable runtime discrepancy while allowing script execution to continue.</summary>
@@ -103,8 +109,10 @@ public interface IHost
// read/message-skip branch reaches op 0x20c and presents the completed endpoint immediately.
void WaitForForegroundTransition(GfxState gfx) { }
void PresentFrame(GfxState gfx) { }
// Legacy SYS4 screen-transition family (op 0x25): scripts render two complete frames into
// numbered surfaces, then block while the engine alpha-composites target over source.
// Legacy SYS4 screen-transition family (ops 0x21, 0x22, and 0x25): scripts render complete
// frames into numbered surfaces, then block while the engine alpha-composites an endpoint.
void FadeSurfaceWithBlack(
GfxState gfx, int surface, long intervalArgument, SurfaceBlackFadeDirection direction) { }
void CrossfadeSurfaces(GfxState gfx, int sourceSurface, int targetSurface, long intervalArgument) { }
void CreateTexture(int slot, int width, int height);
/// <summary>Return a stable RGBA snapshot of one numbered surface, or null when unavailable.</summary>

2
engine/Age.Engine/Model/LegacyScreenTransitionTiming.cs
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@@ -1,6 +1,6 @@
namespace Age.Engine.Model;
/// <summary>Native timing conversion shared by the legacy op-0x25 screen-transition family.</summary>
/// <summary>Native timing conversion shared by the legacy full-frame screen-transition family.</summary>
public static class LegacyScreenTransitionTiming
{
public static long DurationMilliseconds(long argument)

10
engine/Age.Engine/Vm/VirtualMachine.cs
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@@ -2657,6 +2657,16 @@ public sealed class VirtualMachine
Read(a[4]), (int)Read(a[5]), Read(a[6]), Read(a[7])); return pc + 1;
case "present-frame": // 0x20c: read/message-skip path snaps a queued transition to its endpoint
_host.PresentFrame(Gfx); return pc + 1;
case "fade-surface-in-from-black": // 0x21: blocking black -> captured full-frame surface
case "u00418860":
_host.FadeSurfaceWithBlack(
Gfx, (int)Read(a[0]), Read(a[1]), SurfaceBlackFadeDirection.FromBlack);
return pc + 1;
case "fade-surface-out-to-black": // 0x22: blocking captured full-frame surface -> black
case "u00418920":
_host.FadeSurfaceWithBlack(
Gfx, (int)Read(a[0]), Read(a[1]), SurfaceBlackFadeDirection.ToBlack);
return pc + 1;
case "crossfade-surfaces": // 0x25: legacy full-frame surface alpha transition
case "u00418B40":
_host.CrossfadeSurfaces(Gfx, (int)Read(a[0]), (int)Read(a[1]), Read(a[2]));