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/*
* Copyright (c) 2009-2021 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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
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package com.jme3.opencl;
import com.jme3.asset.AssetInfo;
import com.jme3.asset.AssetKey;
import com.jme3.asset.AssetManager;
import com.jme3.asset.AssetNotFoundException;
import com.jme3.opencl.Image.ImageDescriptor;
import com.jme3.opencl.Image.ImageFormat;
import com.jme3.opencl.Image.ImageType;
import com.jme3.scene.VertexBuffer;
import com.jme3.texture.FrameBuffer;
import com.jme3.texture.Texture;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* The central OpenCL context. Every action starts from here.
* The context can be obtained by {@link com.jme3.system.JmeContext#getOpenCLContext() }.
*
* The context is used to:
*
* - Query the available devices
* - Create a command queue
* - Create buffers and images
* - Created buffers and images shared with OpenGL vertex buffers, textures and renderbuffers
* - Create program objects from source code and source files
*
*
* @author shaman
*/
public abstract class Context extends AbstractOpenCLObject {
private static final Logger LOG = Logger.getLogger(Context.class.getName());
protected Context(ObjectReleaser releaser) {
super(releaser);
}
@Override
public Context register() {
super.register();
return this;
}
/**
* Returns all available devices for this context.
* These devices all belong to the same {@link Platform}.
* They are used to create a command queue sending commands to a particular
* device, see {@link #createQueue(com.jme3.opencl.Device) }.
* Also, device capabilities, like the supported OpenCL version, extensions,
* memory size and so on, are queried over the Device instances.
*
* The available devices were specified by a {@link PlatformChooser}.
*
* @return a list of devices
*/
public abstract List getDevices();
/**
* Alternative version of {@link #createQueue(com.jme3.opencl.Device) },
* just uses the first device returned by {@link #getDevices() }.
*
* @return the command queue
*/
public CommandQueue createQueue() {
return createQueue(getDevices().get(0));
}
/**
* Creates a command queue sending commands to the specified device.
* The device must be an entry of {@link #getDevices() }.
*
* @param device the target device
* @return the command queue
*/
public abstract CommandQueue createQueue(Device device);
/**
* Allocates a new buffer of the specific size and access type on the device.
*
* @param size the size of the buffer in bytes
* @param access the allowed access of this buffer from kernel code
* @return the new buffer
*/
public abstract Buffer createBuffer(long size, MemoryAccess access);
/**
* Alternative version of {@link #createBuffer(long, com.jme3.opencl.MemoryAccess) },
* creates a buffer with read and write access.
*
* @param size the size of the buffer in bytes
* @return the new buffer
*/
public Buffer createBuffer(long size) {
return createBuffer(size, MemoryAccess.READ_WRITE);
}
/**
* Creates a new buffer wrapping the specific host memory. This host memory
* specified by a ByteBuffer can then be used directly by kernel code,
* although the access might be slower than with native buffers
* created by {@link #createBuffer(long, com.jme3.opencl.MemoryAccess) }.
*
* @param data the host buffer to use
* @param access the allowed access of this buffer from kernel code
* @return the new buffer
*/
public abstract Buffer createBufferFromHost(ByteBuffer data, MemoryAccess access);
/**
* Alternative version of {@link #createBufferFromHost(java.nio.ByteBuffer, com.jme3.opencl.MemoryAccess) },
* creates a buffer with read and write access.
*
* @param data the host buffer to use
* @return the new buffer
*/
public Buffer createBufferFromHost(ByteBuffer data) {
return createBufferFromHost(data, MemoryAccess.READ_WRITE);
}
/**
* Creates a new 1D, 2D, 3D image.
* {@code ImageFormat} specifies the element type and order, like RGBA of floats.
* {@code ImageDescriptor} specifies the dimension of the image.
* Furthermore, a ByteBuffer can be specified in the ImageDescriptor together
* with row and slice pitches. This buffer is then used to store the image.
* If no ByteBuffer is specified, a new buffer is allocated (this is the
* normal behaviour).
*
* @param access the allowed access of this image from kernel code
* @param format the image format
* @param descr the image descriptor
* @return the new image object
*/
public abstract Image createImage(MemoryAccess access, ImageFormat format, ImageDescriptor descr);
//TODO: add simplified methods for 1D, 2D, 3D textures
/**
* Queries all supported image formats for a specified memory access and
* image type.
*
* Note that the returned array may contain {@code ImageFormat} objects
* where {@code ImageChannelType} or {@code ImageChannelOrder} are {@code null}
* (or both). This is the case when the device supports new formats that
* are not included in this wrapper yet.
*
* @param access the memory access type
* @param type the image type (1D, 2D, 3D, ...)
* @return an array of all supported image formats
*/
public abstract ImageFormat[] querySupportedFormats(MemoryAccess access, ImageType type);
//Interop
/**
* Creates a shared buffer from a VertexBuffer.
* The returned buffer and the vertex buffer operate on the same memory,
* changes in one view are visible in the other view.
* This can be used to modify meshes directly from OpenCL (e.g. for particle systems).
*
* Note: The vertex buffer must already been uploaded to the GPU,
* i.e. it must be used at least once for drawing.
*
* Before the returned buffer can be used, it must be acquired explicitly
* by {@link Buffer#acquireBufferForSharingAsync(com.jme3.opencl.CommandQueue) }
* and after modifying it, released by {@link Buffer#releaseBufferForSharingAsync(com.jme3.opencl.CommandQueue) }.
* This is needed so that OpenGL and OpenCL operations do not interfere with each other.
*
* @param vb the vertex buffer to share
* @param access the memory access for the kernel
* @return the new buffer
*/
public abstract Buffer bindVertexBuffer(VertexBuffer vb, MemoryAccess access);
/**
* Creates a shared image object from a jME3-image.
* The returned image shares the same memory with the jME3-image, changes
* in one view are visible in the other view.
* This can be used to modify textures and images directly from OpenCL
* (e.g. for post-processing effects and other texture effects).
*
* Note: The image must already been uploaded to the GPU,
* i.e. it must be used at least once for drawing.
*
* Before the returned image can be used, it must be acquired explicitly
* by {@link Image#acquireImageForSharingAsync(com.jme3.opencl.CommandQueue) }
* and after modifying it, released by {@link Image#releaseImageForSharingAsync(com.jme3.opencl.CommandQueue) }
* This is needed so that OpenGL and OpenCL operations do not interfere with each other.
*
* @param image the jME3 image object
* @param textureType the texture type (1D, 2D, 3D), since this is not stored in the image
* @param miplevel the mipmap level that should be shared
* @param access the allowed memory access for kernels
* @return the OpenCL image
*/
public abstract Image bindImage(com.jme3.texture.Image image, Texture.Type textureType, int miplevel, MemoryAccess access);
/**
* Creates a shared image object from a jME3 texture.
* The returned image shares the same memory with the jME3 texture, changes
* in one view are visible in the other view.
* This can be used to modify textures and images directly from OpenCL
* (e.g. for post-processing effects and other texture effects).
*
* Note: The image must already been uploaded to the GPU,
* i.e. it must be used at least once for drawing.
*
* Before the returned image can be used, it must be acquired explicitly
* by {@link Image#acquireImageForSharingAsync(com.jme3.opencl.CommandQueue) }
* and after modifying it, released by {@link Image#releaseImageForSharingAsync(com.jme3.opencl.CommandQueue) }
* This is needed so that OpenGL and OpenCL operations do not interfere with each other.
*
* This method is equivalent to calling
* {@code bindImage(texture.getImage(), texture.getType(), miplevel, access)}.
*
* @param texture the jME3 texture
* @param miplevel the mipmap level that should be shared
* @param access the allowed memory access for kernels
* @return the OpenCL image
*/
public Image bindImage(Texture texture, int miplevel, MemoryAccess access) {
return bindImage(texture.getImage(), texture.getType(), miplevel, access);
}
/**
* Alternative version to {@link #bindImage(com.jme3.texture.Texture, int, com.jme3.opencl.MemoryAccess) },
* uses {@code miplevel=0}.
*
* @param texture the jME3 texture
* @param access the allowed memory access for kernels
* @return the OpenCL image
*/
public Image bindImage(Texture texture, MemoryAccess access) {
return bindImage(texture, 0, access);
}
/**
* Creates a shared image object from a jME3 render buffer.
* The returned image shares the same memory with the jME3 render buffer, changes
* in one view are visible in the other view.
*
* This can be used as an alternative to post-processing effects
* (e.g. reduce sum operations, needed e.g. for tone mapping).
*
* Note: The renderbuffer must already been uploaded to the GPU,
* i.e. it must be used at least once for drawing.
*
* Before the returned image can be used, it must be acquired explicitly
* by {@link Image#acquireImageForSharingAsync(com.jme3.opencl.CommandQueue) }
* and after modifying it, released by {@link Image#releaseImageForSharingAsync(com.jme3.opencl.CommandQueue) }
* This is needed so that OpenGL and OpenCL operations do not interfere with each other.
*
* @param buffer the buffer to bind
* @param access the kernel access permissions
* @return an image
*/
public Image bindRenderBuffer(FrameBuffer.RenderBuffer buffer, MemoryAccess access) {
if (buffer.getTexture() == null) {
return bindPureRenderBuffer(buffer, access);
} else {
return bindImage(buffer.getTexture(), access);
}
}
protected abstract Image bindPureRenderBuffer(FrameBuffer.RenderBuffer buffer, MemoryAccess access);
/**
* Creates a program object from the provided source code.
* The program still needs to be compiled using {@link Program#build() }.
*
* @param sourceCode the source code
* @return the program object
*/
public abstract Program createProgramFromSourceCode(String sourceCode);
/**
* Resolves dependencies (using {@code #include } in the source code)
* and delegates the combined source code to
* {@link #createProgramFromSourceCode(java.lang.String) }.
* Important: only absolute paths are allowed.
*
* @param sourceCode the original source code
* @param assetManager the asset manager to load the files
* @return the created program object
* @throws AssetNotFoundException if a dependency could not be loaded
*/
public Program createProgramFromSourceCodeWithDependencies(String sourceCode, AssetManager assetManager) {
StringBuilder builder = new StringBuilder(sourceCode.length());
BufferedReader reader = new BufferedReader(new StringReader(sourceCode));
try {
buildSourcesRec(reader, builder, assetManager);
} catch (IOException ex) {
throw new AssetNotFoundException("Unable to read a dependency file", ex);
}
return createProgramFromSourceCode(builder.toString());
}
private void buildSourcesRec(BufferedReader reader, StringBuilder builder, AssetManager assetManager) throws IOException {
String ln;
while ((ln = reader.readLine()) != null) {
if (ln.trim().startsWith("#import ")) {
ln = ln.trim().substring(8).trim();
if (ln.startsWith("\"")) {
ln = ln.substring(1);
}
if (ln.endsWith("\"")) {
ln = ln.substring(0, ln.length() - 1);
}
AssetInfo info = assetManager.locateAsset(new AssetKey(ln));
if (info == null) {
throw new AssetNotFoundException("Unable to load source file \"" + ln + "\"");
}
try (BufferedReader r = new BufferedReader(new InputStreamReader(info.openStream()))) {
builder.append("//-- begin import ").append(ln).append(" --\n");
buildSourcesRec(r, builder, assetManager);
builder.append("//-- end import ").append(ln).append(" --\n");
}
} else {
builder.append(ln).append('\n');
}
}
}
/**
* Creates a program object from the provided source code and files.
* The source code is made up from the specified include string first,
* then all files specified by the resource array (array of asset paths)
* are loaded by the provided asset manager and appended to the source code.
*
* The typical use case is:
*
* - The include string contains some compiler constants like the grid size
* - Some common OpenCL files used as libraries (Convention: file names end with {@code .clh}
* - One main OpenCL file containing the actual kernels (Convention: file name ends with {@code .cl})
*
*
* After the files were combined, additional include statements are resolved
* by {@link #createProgramFromSourceCodeWithDependencies(java.lang.String, com.jme3.asset.AssetManager) }.
*
* @param assetManager the asset manager used to load the files
* @param include an additional include string
* @param resources an array of asset paths pointing to OpenCL source files
* @return the new program objects
* @throws AssetNotFoundException if a file could not be loaded
*/
public Program createProgramFromSourceFilesWithInclude(AssetManager assetManager, String include, String... resources) {
return createProgramFromSourceFilesWithInclude(assetManager, include, Arrays.asList(resources));
}
/**
* Creates a program object from the provided source code and files.
* The source code is made up from the specified include string first,
* then all files specified by the resource array (array of asset paths)
* are loaded by the provided asset manager and appended to the source code.
*
* The typical use case is:
*
* - The include string contains some compiler constants like the grid size
* - Some common OpenCL files used as libraries (Convention: file names end with {@code .clh}
* - One main OpenCL file containing the actual kernels (Convention: file name ends with {@code .cl})
*
*
* After the files were combined, additional include statements are resolved
* by {@link #createProgramFromSourceCodeWithDependencies(java.lang.String, com.jme3.asset.AssetManager) }.
*
* @param assetManager the asset manager used to load the files
* @param include an additional include string
* @param resources an array of asset paths pointing to OpenCL source files
* @return the new program objects
* @throws AssetNotFoundException if a file could not be loaded
*/
public Program createProgramFromSourceFilesWithInclude(AssetManager assetManager, String include, List resources) {
StringBuilder str = new StringBuilder();
str.append(include);
for (String res : resources) {
AssetInfo info = assetManager.locateAsset(new AssetKey(res));
if (info == null) {
throw new AssetNotFoundException("Unable to load source file \"" + res + "\"");
}
try (BufferedReader reader = new BufferedReader(new InputStreamReader(info.openStream()))) {
while (true) {
String line = reader.readLine();
if (line == null) {
break;
}
str.append(line).append('\n');
}
} catch (IOException ex) {
LOG.log(Level.WARNING, "unable to load source file '" + res + "'", ex);
}
}
return createProgramFromSourceCodeWithDependencies(str.toString(), assetManager);
}
/**
* Alternative version of {@link #createProgramFromSourceFilesWithInclude(com.jme3.asset.AssetManager, java.lang.String, java.lang.String...) }
* with an empty include string
*
* @param assetManager for loading assets
* @param resources asset paths pointing to OpenCL source files
* @return a new instance
* @throws AssetNotFoundException if a file could not be loaded
*/
public Program createProgramFromSourceFiles(AssetManager assetManager, String... resources) {
return createProgramFromSourceFilesWithInclude(assetManager, "", resources);
}
/**
* Alternative version of {@link #createProgramFromSourceFilesWithInclude(com.jme3.asset.AssetManager, java.lang.String, java.util.List) }
* with an empty include string
*
* @param assetManager for loading assets
* @param resources a list of asset paths pointing to OpenCL source files
* @return a new instance
* @throws AssetNotFoundException if a file could not be loaded
*/
public Program createProgramFromSourceFiles(AssetManager assetManager, List resources) {
return createProgramFromSourceFilesWithInclude(assetManager, "", resources);
}
/**
* Creates a program from the specified binaries.
* The binaries are created by {@link Program#getBinary(com.jme3.opencl.Device) }.
* The returned program still needs to be build using
* {@link Program#build(java.lang.String, com.jme3.opencl.Device...) }.
* Important:The device passed to {@code Program.getBinary(..)},
* this method and {@code Program#build(..)} must be the same.
*
* The binaries are used to build a program cache across multiple launches
* of the application. The programs build much faster from binaries than
* from sources.
*
* @param binaries the binaries
* @param device the device to use
* @return the new program
*/
public abstract Program createProgramFromBinary(ByteBuffer binaries, Device device);
@Override
public String toString() {
return "Context (" + getDevices() + ')';
}
}