ARBFramebufferNoAttachments (LWJGL 3.2.4 SNAPSHOT

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

```
public class ARBFramebufferNoAttachments
extends java.lang.Object
```
Native bindings to the ARB_framebuffer_no_attachments extension.
Framebuffer objects as introduced by ARB_framebuffer_object and OpenGL 3.0 provide a generalized mechanism for rendering to off-screen surfaces. Each framebuffer object may have depth, stencil and zero or more color attachments that can be written to by the GL. The size of the framebuffer (width, height, layer count, sample count) is derived from the attachments of that framebuffer. In unextended OpenGL 4.2, it is not legal to render into a framebuffer object that has no attachments. Such a framebuffer would be considered incomplete with the FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT status.

With OpenGL 4.2 and ARB_shader_image_load_store, fragment shaders are capable of doing random access writes to buffer and texture memory via image loads, stores, and atomics. This ability enables algorithms using the conventional rasterizer to generate a collection of fragments, where each fragment shader invocation will write its outputs to buffer or texture memory using image stores or atomics. Such algorithms may have no need to write color or depth values to a conventional framebuffer. However, a framebuffer with no attachments will be considered incomplete and no rasterization or fragment shader exectuion will occur. To avoid such errors, an application may be required to create an otherwise unnecessary "dummy" texture and attach it to the framebuffer (possibly with color writes masked off). If the algorithm requires the rasterizer to operate over a large number of pixels, this dummy texture will needlessly consume a significant amount of memory.

This extension enables the algorithms described above to work even with a framebuffer with no attachments. Applications can specify default width, height, layer count, and sample count parameters for a framebuffer object. When a framebuffer with no attachments is bound, it will be considered complete as long as the application has specified non-zero default width and height parameters. For the purposes of rasterization, the framebuffer will be considered to have a width, height, layer count, and sample count derived from its default parameters. Framebuffers with one or more attachments are not affected by these default parameters; the size of the framebuffer will still be derived from the sizes of the attachments in that case.

Additionally, this extension provides queryable implementation-dependent maximums for framebuffer width, height, layer count, and sample count, which may differ from similar limits on textures and renderbuffers. These maximums will be used to error-check the default framebuffer parameters and also permit implementations to expose the ability to rasterize to an attachment-less framebuffer larger than the maximum supported texture size.

Requires OpenGL 3.0 or ARB_framebuffer_object. Promoted to core in OpenGL 4.3.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS` Accepted by the `pname` parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
`static int`	`GL_FRAMEBUFFER_DEFAULT_HEIGHT` Accepted by the `pname` parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
`static int`	`GL_FRAMEBUFFER_DEFAULT_LAYERS` Accepted by the `pname` parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
`static int`	`GL_FRAMEBUFFER_DEFAULT_SAMPLES` Accepted by the `pname` parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
`static int`	`GL_FRAMEBUFFER_DEFAULT_WIDTH` Accepted by the `pname` parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
`static int`	`GL_MAX_FRAMEBUFFER_HEIGHT` Accepted by the `pname` parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
`static int`	`GL_MAX_FRAMEBUFFER_LAYERS` Accepted by the `pname` parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
`static int`	`GL_MAX_FRAMEBUFFER_SAMPLES` Accepted by the `pname` parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
`static int`	`GL_MAX_FRAMEBUFFER_WIDTH` Accepted by the `pname` parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static void`	`glFramebufferParameteri(int target, int pname, int param)` Sets a named parameter of a framebuffer.
`static int`	`glGetFramebufferParameteri(int target, int pname)` Retrieves a named parameter from a framebuffer.
`static void`	`glGetFramebufferParameteriv(int target, int pname, int[] params)` Array version of: `GetFramebufferParameteriv`
`static void`	`glGetFramebufferParameteriv(int target, int pname, java.nio.IntBuffer params)` Retrieves a named parameter from a framebuffer.
`static int`	`glGetNamedFramebufferParameteriEXT(int framebuffer, int pname)` DSA version of `GetFramebufferParameteriv`.
`static void`	`glGetNamedFramebufferParameterivEXT(int framebuffer, int pname, int[] params)` Array version of: `GetNamedFramebufferParameterivEXT`
`static void`	`glGetNamedFramebufferParameterivEXT(int framebuffer, int pname, java.nio.IntBuffer params)` DSA version of `GetFramebufferParameteriv`.
`static void`	`glNamedFramebufferParameteriEXT(int framebuffer, int pname, int param)` DSA version of `FramebufferParameteri`.
`static void`	`nglGetFramebufferParameteriv(int target, int pname, long params)` Unsafe version of: `GetFramebufferParameteriv`
`static void`	`nglGetNamedFramebufferParameterivEXT(int framebuffer, int pname, long params)` Unsafe version of: `GetNamedFramebufferParameterivEXT`

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

- Field Detail
  - GL_FRAMEBUFFER_DEFAULT_WIDTH
```
public static final int GL_FRAMEBUFFER_DEFAULT_WIDTH
```
    Accepted by the pname parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
    
    See Also:
    
    Constant Field Values
  - GL_FRAMEBUFFER_DEFAULT_HEIGHT
```
public static final int GL_FRAMEBUFFER_DEFAULT_HEIGHT
```
    Accepted by the pname parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
    
    See Also:
    
    Constant Field Values
  - GL_FRAMEBUFFER_DEFAULT_LAYERS
```
public static final int GL_FRAMEBUFFER_DEFAULT_LAYERS
```
    Accepted by the pname parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
    
    See Also:
    
    Constant Field Values
  - GL_FRAMEBUFFER_DEFAULT_SAMPLES
```
public static final int GL_FRAMEBUFFER_DEFAULT_SAMPLES
```
    Accepted by the pname parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
    
    See Also:
    
    Constant Field Values
  - GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
```
public static final int GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
```
    Accepted by the pname parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
    
    See Also:
    
    Constant Field Values
  - GL_MAX_FRAMEBUFFER_WIDTH
```
public static final int GL_MAX_FRAMEBUFFER_WIDTH
```
    Accepted by the pname parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
    
    See Also:
    
    Constant Field Values
  - GL_MAX_FRAMEBUFFER_HEIGHT
```
public static final int GL_MAX_FRAMEBUFFER_HEIGHT
```
    Accepted by the pname parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
    
    See Also:
    
    Constant Field Values
  - GL_MAX_FRAMEBUFFER_LAYERS
```
public static final int GL_MAX_FRAMEBUFFER_LAYERS
```
    Accepted by the pname parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
    
    See Also:
    
    Constant Field Values
  - GL_MAX_FRAMEBUFFER_SAMPLES
```
public static final int GL_MAX_FRAMEBUFFER_SAMPLES
```
    Accepted by the pname parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - glFramebufferParameteri
```
public static void glFramebufferParameteri(int target,
                                           int pname,
                                           int param)
```
    Sets a named parameter of a framebuffer.
    
    Parameters:
    
    target - target of the operation. One of:
    READ_FRAMEBUFFER DRAW_FRAMEBUFFER FRAMEBUFFER
    
    pname - a token indicating the parameter to be modified. One of:
    FRAMEBUFFER_DEFAULT_WIDTH FRAMEBUFFER_DEFAULT_HEIGHT
    FRAMEBUFFER_DEFAULT_LAYERS FRAMEBUFFER_DEFAULT_SAMPLES
    FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
    
    param - the new value for the parameter named pname
  - nglGetFramebufferParameteriv
```
public static void nglGetFramebufferParameteriv(int target,
                                                int pname,
                                                long params)
```
    Unsafe version of: GetFramebufferParameteriv
  - glGetFramebufferParameteriv
```
public static void glGetFramebufferParameteriv(int target,
                                               int pname,
                                               java.nio.IntBuffer params)
```
    Retrieves a named parameter from a framebuffer.
    
    Parameters:
    
    target - target of the operation. One of:
    READ_FRAMEBUFFER DRAW_FRAMEBUFFER FRAMEBUFFER
    
    pname - a token indicating the parameter to be retrieved. One of:
    FRAMEBUFFER_DEFAULT_WIDTH FRAMEBUFFER_DEFAULT_HEIGHT
    FRAMEBUFFER_DEFAULT_LAYERS FRAMEBUFFER_DEFAULT_SAMPLES
    FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
    
    params - a variable to receive the value of the parameter named pname
  - glGetFramebufferParameteri
```
public static int glGetFramebufferParameteri(int target,
                                             int pname)
```
    Retrieves a named parameter from a framebuffer.
    
    Parameters:
    
    target - target of the operation. One of:
    READ_FRAMEBUFFER DRAW_FRAMEBUFFER FRAMEBUFFER
    
    pname - a token indicating the parameter to be retrieved. One of:
    FRAMEBUFFER_DEFAULT_WIDTH FRAMEBUFFER_DEFAULT_HEIGHT
    FRAMEBUFFER_DEFAULT_LAYERS FRAMEBUFFER_DEFAULT_SAMPLES
    FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
  - glNamedFramebufferParameteriEXT
```
public static void glNamedFramebufferParameteriEXT(int framebuffer,
                                                   int pname,
                                                   int param)
```
    DSA version of FramebufferParameteri.
    
    Parameters:
    
    framebuffer - the framebuffer object
    
    pname - a token indicating the parameter to be modified. One of:
    FRAMEBUFFER_DEFAULT_WIDTH FRAMEBUFFER_DEFAULT_HEIGHT
    FRAMEBUFFER_DEFAULT_LAYERS FRAMEBUFFER_DEFAULT_SAMPLES
    FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
    
    param - the new value for the parameter named pname
  - nglGetNamedFramebufferParameterivEXT
```
public static void nglGetNamedFramebufferParameterivEXT(int framebuffer,
                                                        int pname,
                                                        long params)
```
    Unsafe version of: GetNamedFramebufferParameterivEXT
  - glGetNamedFramebufferParameterivEXT
```
public static void glGetNamedFramebufferParameterivEXT(int framebuffer,
                                                       int pname,
                                                       java.nio.IntBuffer params)
```
    DSA version of GetFramebufferParameteriv.
    
    Parameters:
    
    framebuffer - the framebuffer object
    
    pname - a token indicating the parameter to be retrieved. One of:
    FRAMEBUFFER_DEFAULT_WIDTH FRAMEBUFFER_DEFAULT_HEIGHT
    FRAMEBUFFER_DEFAULT_LAYERS FRAMEBUFFER_DEFAULT_SAMPLES
    FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
    
    params - a variable to receive the value of the parameter named pname
  - glGetNamedFramebufferParameteriEXT
```
public static int glGetNamedFramebufferParameteriEXT(int framebuffer,
                                                     int pname)
```
    DSA version of GetFramebufferParameteriv.
    
    Parameters:
    
    framebuffer - the framebuffer object
    
    pname - a token indicating the parameter to be retrieved. One of:
    FRAMEBUFFER_DEFAULT_WIDTH FRAMEBUFFER_DEFAULT_HEIGHT
    FRAMEBUFFER_DEFAULT_LAYERS FRAMEBUFFER_DEFAULT_SAMPLES
    FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
  - glGetFramebufferParameteriv
```
public static void glGetFramebufferParameteriv(int target,
                                               int pname,
                                               int[] params)
```
    Array version of: GetFramebufferParameteriv
  - glGetNamedFramebufferParameterivEXT
```
public static void glGetNamedFramebufferParameterivEXT(int framebuffer,
                                                       int pname,
                                                       int[] params)
```
    Array version of: GetNamedFramebufferParameterivEXT

`FRAMEBUFFER_DEFAULT_WIDTH`	`FRAMEBUFFER_DEFAULT_HEIGHT`
`FRAMEBUFFER_DEFAULT_LAYERS`	`FRAMEBUFFER_DEFAULT_SAMPLES`
`FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS`

Class ARBFramebufferNoAttachments

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

GL_FRAMEBUFFER_DEFAULT_WIDTH

GL_FRAMEBUFFER_DEFAULT_HEIGHT

GL_FRAMEBUFFER_DEFAULT_LAYERS

GL_FRAMEBUFFER_DEFAULT_SAMPLES

GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS

GL_MAX_FRAMEBUFFER_WIDTH

GL_MAX_FRAMEBUFFER_HEIGHT

GL_MAX_FRAMEBUFFER_LAYERS

GL_MAX_FRAMEBUFFER_SAMPLES

Method Detail

glFramebufferParameteri

nglGetFramebufferParameteriv

glGetFramebufferParameteriv

glGetFramebufferParameteri

glNamedFramebufferParameteriEXT

nglGetNamedFramebufferParameterivEXT

glGetNamedFramebufferParameterivEXT

glGetNamedFramebufferParameteriEXT

glGetFramebufferParameteriv

glGetNamedFramebufferParameterivEXT