java.lang.Object
- org.lwjgl.opengl.WGLAMDGPUAssociation

```
public class WGLAMDGPUAssociation
extends java.lang.Object
```
Native bindings to the WGL_AMD_gpu_association extension.
There currently is no way for applications to efficiently use GPU resources in systems that contain more than one GPU. Vendors have provided methods that attempt to split the workload for an application among the available GPU resources. This has proven to be very inefficient because most applications were never written with these sorts of optimizations in mind.

This extension provides a mechanism for applications to explicitly use the GPU resources on a given system individually. By providing this functionality, a driver allows applications to make appropriate decisions regarding where and when to distribute rendering tasks.

Requires WGL_ARB_extensions_string and EXT_framebuffer_object.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`WGL_GPU_CLOCK_AMD WGL_GPU_FASTEST_TARGET_GPUS_AMD WGL_GPU_NUM_PIPES_AMD WGL_GPU_NUM_RB_AMD WGL_GPU_NUM_SIMD_AMD WGL_GPU_NUM_SPI_AMD WGL_GPU_OPENGL_VERSION_STRING_AMD WGL_GPU_RAM_AMD WGL_GPU_RENDERER_STRING_AMD WGL_GPU_VENDOR_AMD` Accepted by the `property` parameter of `GetGPUInfoAMD`.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static void`	`wglBlitContextFramebufferAMD(long dstCtx, int srcX0, int srcY0, int srcX1, int srcY1, int dstX0, int dstY0, int dstX1, int dstY1, int mask, int filter)` Blits data from one context to another.
`static long`	`wglCreateAssociatedContextAMD(int id)` Creates an associated context.
`static long`	`wglCreateAssociatedContextAttribsAMD(int id, long shareContext, int[] attribList)` Array version of: `CreateAssociatedContextAttribsAMD`
`static long`	`wglCreateAssociatedContextAttribsAMD(int id, long shareContext, java.nio.IntBuffer attribList)` Create an associated context with a specific GL version.
`static boolean`	`wglDeleteAssociatedContextAMD(long hglrc)` Deletes an associated context.
`static int`	`wglGetContextGPUIDAMD(long hglrc)` Determine which GPU a context is attached to.
`static long`	`wglGetCurrentAssociatedContextAMD()` Returns the current associated context in the current thread.
`static int`	`wglGetGPUIDsAMD(int[] ids)` Array version of: `GetGPUIDsAMD`
`static int`	`wglGetGPUIDsAMD(java.nio.IntBuffer ids)` Returns the IDs for available GPUs.
`static int`	`wglGetGPUInfoAMD(int id, int property, int dataType, java.nio.ByteBuffer data)` Each GPU in a system may have different properties, performance characteristics and different supported OpenGL versions.
`static int`	`wglGetGPUInfoAMD(int id, int property, int dataType, float[] data)` Array version of: `GetGPUInfoAMD`
`static int`	`wglGetGPUInfoAMD(int id, int property, int dataType, java.nio.FloatBuffer data)` Each GPU in a system may have different properties, performance characteristics and different supported OpenGL versions.
`static int`	`wglGetGPUInfoAMD(int id, int property, int dataType, int[] data)` Array version of: `GetGPUInfoAMD`
`static int`	`wglGetGPUInfoAMD(int id, int property, int dataType, java.nio.IntBuffer data)` Each GPU in a system may have different properties, performance characteristics and different supported OpenGL versions.
`static boolean`	`wglMakeAssociatedContextCurrentAMD(long hglrc)` Makes an associated context current in the current thread.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - WGL_GPU_VENDOR_AMD, WGL_GPU_RENDERER_STRING_AMD, WGL_GPU_OPENGL_VERSION_STRING_AMD, WGL_GPU_FASTEST_TARGET_GPUS_AMD, WGL_GPU_RAM_AMD, WGL_GPU_CLOCK_AMD, WGL_GPU_NUM_PIPES_AMD, WGL_GPU_NUM_SIMD_AMD, WGL_GPU_NUM_RB_AMD, WGL_GPU_NUM_SPI_AMD
    
    Accepted by the property parameter of GetGPUInfoAMD.
- Method Detail
  - wglGetGPUIDsAMD
```
public static int wglGetGPUIDsAMD(java.nio.IntBuffer ids)
```
    Returns the IDs for available GPUs.
    If the function succeeds, the return value is the number of total GPUs available. The value 0 is returned if no GPUs are available or if the call has failed. The ID 0 is reserved and will not be retuned as a valid GPU ID. If the array ids is NULL, the function will only return the total number of GPUs. ids will be tightly packed with no 0 values between valid ids.
    
    Parameters:
    
    ids - the array of returned IDs
  - wglGetGPUInfoAMD
```
public static int wglGetGPUInfoAMD(int id,
                                   int property,
                                   int dataType,
                                   java.nio.ByteBuffer data)

public static int wglGetGPUInfoAMD(int id,
                                   int property,
                                   int dataType,
                                   java.nio.IntBuffer data)

public static int wglGetGPUInfoAMD(int id,
                                   int property,
                                   int dataType,
                                   java.nio.FloatBuffer data)
```
    Each GPU in a system may have different properties, performance characteristics and different supported OpenGL versions. Use this function to determine which GPU is best suited for a specific task.
    For a string, size will be the number of characters allocated and will include NULL termination. For arrays of type GL_UNSIGNED_INT, GL_INT, and GL_FLOAT size will be the array depth. If the function succeeds, the number of values written will be returned. If the number of values written is equal to size, the query should be repeated with a larger data buffer. Strings should be queried using the GL_UNSIGNED_BYTE type, are UTF-8 encoded and will be NULL terminated. If the function fails, -1 will be returned.
    
    Parameters:
    
    id - a GPU id obtained from calling GetGPUIDsAMD
    
    property - the information being queried. One of:
    GPU_VENDOR_AMD GPU_RENDERER_STRING_AMD GPU_OPENGL_VERSION_STRING_AMD GPU_FASTEST_TARGET_GPUS_AMD
    GPU_RAM_AMD GPU_CLOCK_AMD GPU_NUM_PIPES_AMD GPU_NUM_SIMD_AMD
    GPU_NUM_RB_AMD GPU_NUM_SPI_AMD
    
    dataType - the data type to be returned. One of:
    UNSIGNED_INT INT FLOAT UNSIGNED_BYTE
    
    data - the buffer which will be filled with the requested information
  - wglGetContextGPUIDAMD
```
public static int wglGetContextGPUIDAMD(long hglrc)
```
    Determine which GPU a context is attached to.
    Unassociated contexts are created by calling CreateContext. Although these contexts are unassociated, their use will still be tied to a single GPU in most cases. For this reason it is advantageous to be able to query the GPU an existing unassociated context resides on. If multiple GPUs are available, it would be undesirable to use one for rendering to visible surfaces and then chose the same one for off-screen rendering.
    
    Parameters:
    
    hglrc - the context for which the GPU id will be returned
  - wglCreateAssociatedContextAMD
```
public static long wglCreateAssociatedContextAMD(int id)
```
    Creates an associated context. Upon successful creation, no pixel format is tied to an associated context.
    
    Parameters:
    
    id - a valid GPU id
  - wglCreateAssociatedContextAttribsAMD
```
public static long wglCreateAssociatedContextAttribsAMD(int id,
                                                        long shareContext,
                                                        java.nio.IntBuffer attribList)
```
    Create an associated context with a specific GL version.
    All capabilities and limitations of CreateContextAttribsARB apply to CreateAssociatedContextAttribsAMD.
    
    Parameters:
    
    id - a valid GPU id
    
    shareContext - must either be NULL or that of an associated context created with the same GPU ID as id
    
    attribList - a 0-terminated list of attributes for the context
  - wglDeleteAssociatedContextAMD
```
public static boolean wglDeleteAssociatedContextAMD(long hglrc)
```
    Deletes an associated context. An associated context cannot be deleted by calling DeleteContext.
    
    Parameters:
    
    hglrc - a valid associated context created by calling CreateAssociatedContextAMD
  - wglMakeAssociatedContextCurrentAMD
```
public static boolean wglMakeAssociatedContextCurrentAMD(long hglrc)
```
    Makes an associated context current in the current thread.
    
    Parameters:
    
    hglrc - a context handle created by calling CreateAssociatedContextAMD
  - wglGetCurrentAssociatedContextAMD
```
public static long wglGetCurrentAssociatedContextAMD()
```
    Returns the current associated context in the current thread.
  - wglBlitContextFramebufferAMD
```
public static void wglBlitContextFramebufferAMD(long dstCtx,
                                                int srcX0,
                                                int srcY0,
                                                int srcX1,
                                                int srcY1,
                                                int dstX0,
                                                int dstY0,
                                                int dstX1,
                                                int dstY1,
                                                int mask,
                                                int filter)
```
    Blits data from one context to another. This facilitates high performance data communication between multiple contexts.
    
    Parameters:
    
    dstCtx - the context handle for the write context
    
    srcX0 - the source x₀ coordinate
    
    srcY0 - the source Y₀ coordinate
    
    srcX1 - the source X₁ coordinate
    
    srcY1 - the source Y₁ coordinate
    
    dstX0 - the destination X₀ coordinate
    
    dstY0 - the destination Y₀ coordinate
    
    dstX1 - the destination X₁ coordinate
    
    dstY1 - the destination Y₁ coordinate
    
    mask - the bitwise OR of a number of values indicating which buffers are to be copied. One or more of:
    COLOR_BUFFER_BIT DEPTH_BUFFER_BIT STENCIL_BUFFER_BIT
    
    filter - the interpolation method to apply if the image is stretched. One of:
    LINEAR NEAREST
  - wglGetGPUIDsAMD
```
public static int wglGetGPUIDsAMD(int[] ids)
```
    Array version of: GetGPUIDsAMD
  - wglGetGPUInfoAMD
```
public static int wglGetGPUInfoAMD(int id,
                                   int property,
                                   int dataType,
                                   int[] data)

public static int wglGetGPUInfoAMD(int id,
                                   int property,
                                   int dataType,
                                   float[] data)
```
    Array version of: GetGPUInfoAMD
  - wglCreateAssociatedContextAttribsAMD
```
public static long wglCreateAssociatedContextAttribsAMD(int id,
                                                        long shareContext,
                                                        int[] attribList)
```
    Array version of: CreateAssociatedContextAttribsAMD

`GPU_VENDOR_AMD`	`GPU_RENDERER_STRING_AMD`	`GPU_OPENGL_VERSION_STRING_AMD`	`GPU_FASTEST_TARGET_GPUS_AMD`
`GPU_RAM_AMD`	`GPU_CLOCK_AMD`	`GPU_NUM_PIPES_AMD`	`GPU_NUM_SIMD_AMD`
`GPU_NUM_RB_AMD`	`GPU_NUM_SPI_AMD`

Class WGLAMDGPUAssociation

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

WGL_GPU_VENDOR_AMD, WGL_GPU_RENDERER_STRING_AMD, WGL_GPU_OPENGL_VERSION_STRING_AMD, WGL_GPU_FASTEST_TARGET_GPUS_AMD, WGL_GPU_RAM_AMD, WGL_GPU_CLOCK_AMD, WGL_GPU_NUM_PIPES_AMD, WGL_GPU_NUM_SIMD_AMD, WGL_GPU_NUM_RB_AMD, WGL_GPU_NUM_SPI_AMD

Method Detail

wglGetGPUIDsAMD

wglGetGPUInfoAMD

wglGetContextGPUIDAMD

wglCreateAssociatedContextAMD

wglCreateAssociatedContextAttribsAMD

wglDeleteAssociatedContextAMD

wglMakeAssociatedContextCurrentAMD

wglGetCurrentAssociatedContextAMD

wglBlitContextFramebufferAMD

wglGetGPUIDsAMD

wglGetGPUInfoAMD

wglCreateAssociatedContextAttribsAMD