Class ARBFramebufferNoAttachments
- java.lang.Object
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- org.lwjgl.opengl.ARBFramebufferNoAttachments
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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 theFRAMEBUFFER_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
orARB_framebuffer_object
. Promoted to core inOpenGL 4.3
.
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Field Summary
Fields Modifier and Type Field and Description static int
GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
GL_FRAMEBUFFER_DEFAULT_HEIGHT
GL_FRAMEBUFFER_DEFAULT_LAYERS
GL_FRAMEBUFFER_DEFAULT_SAMPLES
GL_FRAMEBUFFER_DEFAULT_WIDTHAccepted by thepname
parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.static int
GL_MAX_FRAMEBUFFER_HEIGHT
GL_MAX_FRAMEBUFFER_LAYERS
GL_MAX_FRAMEBUFFER_SAMPLES
GL_MAX_FRAMEBUFFER_WIDTHAccepted by thepname
parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
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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 ofGetFramebufferParameteriv
.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 ofGetFramebufferParameteriv
.static void
glNamedFramebufferParameteriEXT(int framebuffer, int pname, int param)
DSA version ofFramebufferParameteri
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Field Detail
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GL_FRAMEBUFFER_DEFAULT_WIDTH, GL_FRAMEBUFFER_DEFAULT_HEIGHT, GL_FRAMEBUFFER_DEFAULT_LAYERS, GL_FRAMEBUFFER_DEFAULT_SAMPLES, GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS
Accepted by thepname
parameter of FramebufferParameteri, GetFramebufferParameteriv, NamedFramebufferParameteriEXT, and GetNamedFramebufferParameterivEXT.
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GL_MAX_FRAMEBUFFER_WIDTH, GL_MAX_FRAMEBUFFER_HEIGHT, GL_MAX_FRAMEBUFFER_LAYERS, GL_MAX_FRAMEBUFFER_SAMPLES
Accepted by thepname
parameter of GetIntegerv, GetBooleanv, GetInteger64v, GetFloatv, and GetDoublev.
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Method Detail
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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 namedpname
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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 namedpname
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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
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glNamedFramebufferParameteriEXT
public static void glNamedFramebufferParameteriEXT(int framebuffer, int pname, int param)
DSA version ofFramebufferParameteri
.- Parameters:
framebuffer
- the framebuffer objectpname
- 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 namedpname
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glGetNamedFramebufferParameterivEXT
public static void glGetNamedFramebufferParameterivEXT(int framebuffer, int pname, java.nio.IntBuffer params)
DSA version ofGetFramebufferParameteriv
.- Parameters:
framebuffer
- the framebuffer objectpname
- 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 namedpname
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glGetNamedFramebufferParameteriEXT
public static int glGetNamedFramebufferParameteriEXT(int framebuffer, int pname)
DSA version ofGetFramebufferParameteriv
.- Parameters:
framebuffer
- the framebuffer objectpname
- 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
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glGetFramebufferParameteriv
public static void glGetFramebufferParameteriv(int target, int pname, int[] params)
Array version of:GetFramebufferParameteriv
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glGetNamedFramebufferParameterivEXT
public static void glGetNamedFramebufferParameterivEXT(int framebuffer, int pname, int[] params)
Array version of:GetNamedFramebufferParameterivEXT
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