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Implement legacy black surface fades

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gamer147
2026-07-29 10:40:38 -04:00
parent e70b506ec4
commit 2777da435b
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>