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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| package org.cef.misc; | ||
|
|
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| import java.lang.invoke.MethodHandle; | ||
| import java.lang.invoke.MethodHandles; | ||
| import java.lang.invoke.MethodType; | ||
| import java.nio.ByteBuffer; | ||
|
|
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| public class DataPointer { | ||
| private final long address; | ||
| private ByteBuffer dataBuffer; | ||
| boolean initialized = false; | ||
| int alignment = 3; | ||
|
|
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| public DataPointer(long address) { | ||
| this.address = address; | ||
| } | ||
|
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| public DataPointer forCapacity(int capacity) { | ||
| try { | ||
| dataBuffer = (ByteBuffer) memByteBuffer.invoke(address, capacity); | ||
| initialized = true; | ||
| return this; | ||
| } catch (Throwable err) { | ||
| throw new RuntimeException("Failed to invoke memByteBuffer?", err); | ||
| } | ||
| } | ||
|
|
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| public DataPointer withAlignment(int alignment) { | ||
| this.alignment = alignment; | ||
| return this; | ||
| } | ||
|
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| public long getAddress() { | ||
| return address; | ||
| } | ||
|
|
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| public DataPointer getData(int offset) { | ||
| if (!initialized) throw new RuntimeException("DataPoint#forCapacity must be called before the data can be accessed."); | ||
| return new DataPointer(dataBuffer.getLong(offset << alignment)); | ||
| } | ||
|
|
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| public long getLong(int offset) { | ||
| if (!initialized) throw new RuntimeException("DataPoint#forCapacity must be called before the data can be accessed."); | ||
| return dataBuffer.getLong(offset << alignment); | ||
| } | ||
|
|
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| public int getInt(int offset) { | ||
| if (!initialized) throw new RuntimeException("DataPoint#forCapacity must be called before the data can be accessed."); | ||
| return dataBuffer.getInt(offset << alignment); | ||
| } | ||
|
|
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| public short getShort(int offset) { | ||
| if (!initialized) throw new RuntimeException("DataPoint#forCapacity must be called before the data can be accessed."); | ||
| return dataBuffer.getShort(offset << alignment); | ||
| } | ||
|
|
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| public byte getByte(int offset) { | ||
| if (!initialized) throw new RuntimeException("DataPoint#forCapacity must be called before the data can be accessed."); | ||
| return dataBuffer.get(offset << alignment); | ||
| } | ||
|
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| public double getDouble(int offset) { | ||
| if (!initialized) throw new RuntimeException("DataPoint#forCapacity must be called before the data can be accessed."); | ||
| return dataBuffer.getDouble(offset << alignment); | ||
| } | ||
|
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| public float getFloat(int offset) { | ||
| if (!initialized) throw new RuntimeException("DataPoint#forCapacity must be called before the data can be accessed."); | ||
| return dataBuffer.getFloat(offset << alignment); | ||
| } | ||
|
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| // TODO: ideally we'd just directly depend on lwjgl, since we require it for GLFW anyway | ||
| private static final MethodHandle memByteBuffer; | ||
|
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| static { | ||
| MethodHandles.Lookup lookup = MethodHandles.lookup(); | ||
| try { | ||
| Class<?> clz = Class.forName("org.lwjgl.system.MemoryUtil", false, lookup.lookupClass().getClassLoader()); | ||
| memByteBuffer = lookup.findStatic(clz, "memByteBuffer", MethodType.methodType(ByteBuffer.class, new Class[]{Long.TYPE, Integer.TYPE})); | ||
| } catch (Throwable err) { | ||
| System.err.println("Could not find LWJGL MemoryUtil's memByteBuffer method.\nAre you using LWJGL 3.x?"); | ||
| throw new RuntimeException(err); | ||
| } | ||
| } | ||
| } |
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