External linking mechanism for native and JS (#159)

skiko/build.gradle.kts

@@ -121,8 +121,6 @@ kotlin {
     if (supportNative) {
         val nativeTarget = when (target) {
             "macos-x64", "macos-arm64" -> macosX64()
-                // "linux-x64" -> linuxX64()
-                // "windows-x64" -> mingwX64()
             else -> null
         }
         nativeTarget?.apply {

skiko/src/commonMain/kotlin/org/jetbrains/skia/BackendRenderTarget.kt

@@ -50,10 +50,18 @@ class BackendRenderTarget internal constructor(ptr: Long) : Managed(ptr, _Finali
             return BackendRenderTarget(_nMakeDirect3D(width, height, texturePtr, format, sampleCnt, levelCnt))
         }
 
-        @JvmStatic external fun _nGetFinalizer(): Long
-        @JvmStatic external fun _nMakeGL(width: Int, height: Int, sampleCnt: Int, stencilBits: Int, fbId: Int, fbFormat: Int): Long
-        @JvmStatic external fun _nMakeMetal(width: Int, height: Int, texturePtr: Long): Long
-        @JvmStatic external fun _nMakeDirect3D(
+        @JvmStatic
+        @ExternalSymbolName("BackendRenderTarget_nGetFinalizer")
+        external fun _nGetFinalizer(): Long
+        @JvmStatic
+        @ExternalSymbolName("BackendRenderTarget_nMakeGL")
+        external fun _nMakeGL(width: Int, height: Int, sampleCnt: Int, stencilBits: Int, fbId: Int, fbFormat: Int): Long
+        @JvmStatic
+        @ExternalSymbolName("BackendRenderTarget_nMakeMetal")
+        external fun _nMakeMetal(width: Int, height: Int, texturePtr: Long): Long
+        @JvmStatic
+        @ExternalSymbolName("BackendRenderTarget_nMakeDirect3D")
+        external fun _nMakeDirect3D(
             width: Int,
             height: Int,
             texturePtr: Long,

skiko/src/commonMain/kotlin/org/jetbrains/skia/Expects.kt

@@ -28,3 +28,7 @@ interface BooleanSupplier {
      */
     val asBoolean: Boolean
 }
+
+@OptIn(ExperimentalMultiplatform::class)
+@OptionalExpectation
+expect annotation class ExternalSymbolName(val name: String)

skiko/src/jsMain/kotlin/org/jetbrains/skia/Actuals.js.kt

@@ -21,3 +21,5 @@ actual class Matcher {
 actual fun defaultLanguageTag(): String = TODO()
 
 actual fun compilePattern(regex: String): Pattern = TODO()
+
+actual typealias ExternalSymbolName = kotlin.js.JsName

skiko/src/macosX64Main/cpp/common/BackendRenderTarget.cc

+#include <iostream>
+#include <jni.h>
+#include "GrBackendSurface.h"
+
+static void deleteBackendRenderTarget(GrBackendRenderTarget* rt) {
+    delete rt;
+}
+
+extern "C" jlong BackendRenderTarget_nGetFinalizer() {
+    return static_cast<jlong>(reinterpret_cast<uintptr_t>(&deleteBackendRenderTarget));
+}
+
+extern "C" jlong BackendRenderTarget_nMakeGL
+  (jint width, jint height, jint sampleCnt, jint stencilBits, jint fbId, jint fbFormat) {
+    GrGLFramebufferInfo glInfo = { static_cast<unsigned int>(fbId), static_cast<unsigned int>(fbFormat) };
+    GrBackendRenderTarget* instance = new GrBackendRenderTarget(width, height, sampleCnt, stencilBits, glInfo);
+    return reinterpret_cast<jlong>(instance);
+}
+
+extern "C" jlong BackendRenderTarget_nMakeMetal
+  (jint width, jint height, jlong texturePtr) {
+#ifdef SK_METAL
+    GrMTLHandle texture = reinterpret_cast<GrMTLHandle>(static_cast<uintptr_t>(texturePtr));
+    GrMtlTextureInfo fbInfo;
+    fbInfo.fTexture.retain(texture);
+    GrBackendRenderTarget* instance = new GrBackendRenderTarget(width, height, fbInfo);
+    return reinterpret_cast<jlong>(instance);
+#else
+    return 0;
+#endif
+}
+#endif
+
+#ifdef SK_DIRECT3D
+#include "d3d/GrD3DTypes.h"
+#endif
+
+extern "C" jlong BackendRenderTarget_MakeDirect3D
+  (jint width, jint height, jlong texturePtr, jint format, jint sampleCnt, jint levelCnt) {#ifdef SK_DIRECT3D
+#ifdef SK_DIRECT3D
+    GrD3DTextureResourceInfo texResInfo = {};
+    ID3D12Resource* resource = reinterpret_cast<ID3D12Resource*>(static_cast<uintptr_t>(texturePtr));
+    texResInfo.fResource.retain(resource);
+    texResInfo.fResourceState = D3D12_RESOURCE_STATE_COMMON;
+    texResInfo.fFormat = static_cast<DXGI_FORMAT>(format);
+    texResInfo.fSampleCount = static_cast<uint32_t>(sampleCnt);
+    texResInfo.fLevelCount = static_cast<uint32_t>(levelCnt);
+    GrBackendRenderTarget* instance = new GrBackendRenderTarget(width, height, texResInfo);
+    return reinterpret_cast<jlong>(instance);
+#else
+    return 0;
+#endif
+}
\ No newline at end of file

skiko/src/macosX64Main/kotlin/org/jetbrains/skia/Actuals.native.kt

@@ -21,3 +21,5 @@ actual class Matcher {
 actual fun defaultLanguageTag(): String = TODO()
 
 actual fun compilePattern(regex: String): Pattern = TODO()
+
+actual typealias ExternalSymbolName = kotlin.native.SymbolName