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render: add render.compose seam + second-screen bridge

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Expose a generic seam so a mod can drive a second screen without the
engine owning any dual-screen layout policy:

- render.compose hook in Renderer:endFrame hands a mod the finished
  world + UI canvases, their SGB zones, the frame metrics,
  Renderer:blitCanvas (lifted from the internal blit closure) and the
  SecondScreen bridge. Return true to take over the window; no wrap (or
  calling next) runs the normal single-window composite byte-for-byte.
- SecondScreen.lua + the Android Presentation bridge (love_android_
  secondary_* in common/android.cpp, GameActivity secondary display)
  as the optional physical-second-display transport.

No battle-render changes: a mod lays out the two screens (including any
battle split) itself. Ships with a unit test, no-mod parity via
gate_hooks, and docs/modding.md (D14).
This commit is contained in:
Bart in 't Veld
2026-08-01 09:35:24 +02:00
parent 4916fc8f4b
commit 218b9249a2
6 changed files with 430 additions and 30 deletions
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mobile/android/love/src/jni/love/src/common/android.cpp
+47
View File
@@ -851,4 +851,51 @@ const char *getArg0()
} // android
} // love
extern "C" __attribute__((visibility("default")))
int love_android_secondary_ready()
{
JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();
jclass activity = env->FindClass("org/love2d/android/GameActivity");
jmethodID m = env->GetStaticMethodID(activity, "hasSecondaryDisplay", "()Z");
jboolean ready = JNI_FALSE;
if (m)
ready = env->CallStaticBooleanMethod(activity, m);
else
env->ExceptionClear();
env->DeleteLocalRef(activity);
return ready ? 1 : 0;
}
extern "C" __attribute__((visibility("default")))
void love_android_push_secondary(const void *rgba, int w, int h)
{
if (!rgba || w <= 0 || h <= 0)
return;
JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();
jclass activity = env->FindClass("org/love2d/android/GameActivity");
jmethodID m = env->GetStaticMethodID(activity, "updateSecondaryFrame", "(Ljava/nio/ByteBuffer;II)V");
if (m)
{
jobject buf = env->NewDirectByteBuffer((void*) rgba, (jlong) w * (jlong) h * 4);
env->CallStaticVoidMethod(activity, m, buf, w, h);
env->DeleteLocalRef(buf);
}
else
env->ExceptionClear();
env->DeleteLocalRef(activity);
}
extern "C" __attribute__((visibility("default")))
void love_android_secondary_enable(int on)
{
JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();
jclass activity = env->FindClass("org/love2d/android/GameActivity");
jmethodID m = env->GetStaticMethodID(activity, "setSecondaryEnabled", "(Z)V");
if (m)
env->CallStaticVoidMethod(activity, m, on ? JNI_TRUE : JNI_FALSE);
else
env->ExceptionClear();
env->DeleteLocalRef(activity);
}
#endif // LOVE_ANDROID