gpu: add opencl support for macos

This allows using opencl as an alternative to opengl compute shaders on
macos, which does not support compute shaders. Now, macos can finally
use the extended draw distance feture of the gpu plugin.

This also includes code for using opencl with Windows and Linux if we
want to enable that in the future. A copy of the existing compute
shaders have been checked in and ported to opencl, keeping support for
opengl compute shaders on Windows and Linux.

runelite-client/pom.xml

@@ -177,6 +177,25 @@
 			<version>2.4.0-rc-20210117</version>
 			<scope>runtime</scope>
 		</dependency>
+		<dependency>
+			<groupId>net.runelite.jocl</groupId>
+			<artifactId>jocl</artifactId>
+			<version>1.0</version>
+		</dependency>
+		<dependency>
+			<groupId>net.runelite.jocl</groupId>
+			<artifactId>jocl</artifactId>
+			<version>1.0</version>
+			<classifier>macos-x64</classifier>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>net.runelite.jocl</groupId>
+			<artifactId>jocl</artifactId>
+			<version>1.0</version>
+			<classifier>macos-arm64</classifier>
+			<scope>runtime</scope>
+		</dependency>
 		<dependency>
 			<groupId>net.runelite</groupId>
 			<artifactId>archive-patcher</artifactId>

runelite-client/src/main/java/net/runelite/client/plugins/gpu/GLBuffer.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2021, Adam <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.client.plugins.gpu;
+
+import org.jocl.Pointer;
+import org.jocl.cl_mem;
+
+class GLBuffer
+{
+	int glBufferId = -1;
+	int size = -1;
+	cl_mem cl_mem;
+
+	Pointer ptr()
+	{
+		return cl_mem != null ? Pointer.to(cl_mem) : null;
+	}
+}