Class EXTFramebufferObject
- java.lang.Object
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- org.lwjgl.opengl.EXTFramebufferObject
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public class EXTFramebufferObject extends java.lang.Object
Native bindings to the EXT_framebuffer_object extension.This extension defines a simple interface for drawing to rendering destinations other than the buffers provided to the GL by the window-system.
In this extension, these newly defined rendering destinations are known collectively as "framebuffer-attachable images". This extension provides a mechanism for attaching framebuffer-attachable images to the GL framebuffer as one of the standard GL logical buffers: color, depth, and stencil. (Attaching a framebuffer-attachable image to the accum logical buffer is left for a future extension to define). When a framebuffer-attachable image is attached to the framebuffer, it is used as the source and destination of fragment operations.
By allowing the use of a framebuffer-attachable image as a rendering destination, this extension enables a form of "offscreen" rendering. Furthermore, "render to texture" is supported by allowing the images of a texture to be used as framebuffer-attachable images. A particular image of a texture object is selected for use as a framebuffer-attachable image by specifying the mipmap level, cube map face (for a cube map texture), and z-offset (for a 3D texture) that identifies the image. The "render to texture" semantics of this extension are similar to performing traditional rendering to the framebuffer, followed immediately by a call to CopyTexSubImage. However, by using this extension instead, an application can achieve the same effect, but with the advantage that the GL can usually eliminate the data copy that would have been incurred by calling CopyTexSubImage.
This extension also defines a new GL object type, called a "renderbuffer", which encapsulates a single 2D pixel image. The image of renderbuffer can be used as a framebuffer-attachable image for generalized offscreen rendering and it also provides a means to support rendering to GL logical buffer types which have no corresponding texture format (stencil, accum, etc). A renderbuffer is similar to a texture in that both renderbuffers and textures can be independently allocated and shared among multiple contexts. The framework defined by this extension is general enough that support for attaching images from GL objects other than textures and renderbuffers could be added by layered extensions.
To facilitate efficient switching between collections of framebuffer-attachable images, this extension introduces another new GL object, called a framebuffer object. A framebuffer object contains the state that defines the traditional GL framebuffer, including its set of images. Prior to this extension, it was the window-system which defined and managed this collection of images, traditionally by grouping them into a "drawable". The window-system API's would also provide a function (i.e., wglMakeCurrent, glXMakeCurrent, aglSetDrawable, etc.) to bind a drawable with a GL context (as is done in the WGL_ARB_pbuffer extension). In this extension however, this functionality is subsumed by the GL and the GL provides the function BindFramebufferEXT to bind a framebuffer object to the current context. Later, the context can bind back to the window-system-provided framebuffer in order to display rendered content.
Previous extensions that enabled rendering to a texture have been much more complicated. One example is the combination of ARB_pbuffer and ARB_render_texture, both of which are window-system extensions. This combination requires calling MakeCurrent, an operation that may be expensive, to switch between the window and the pbuffer drawables. An application must create one pbuffer per renderable texture in order to portably use ARB_render_texture. An application must maintain at least one GL context per texture format, because each context can only operate on a single pixelformat or FBConfig. All of these characteristics make ARB_render_texture both inefficient and cumbersome to use.
EXT_framebuffer_object, on the other hand, is both simpler to use and more efficient than ARB_render_texture. The EXT_framebuffer_object API is contained wholly within the GL API and has no (non-portable) window-system components. Under EXT_framebuffer_object, it is not necessary to create a second GL context when rendering to a texture image whose format differs from that of the window. Finally, unlike the pbuffers of ARB_render_texture, a single framebuffer object can facilitate rendering to an unlimited number of texture objects.
Promoted to core in
OpenGL 3.0
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Field Summary
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method and Description static void
glBindFramebufferEXT(int target, int framebuffer)
static void
glBindRenderbufferEXT(int target, int renderbuffer)
static int
glCheckFramebufferStatusEXT(int target)
static void
glDeleteFramebuffersEXT(int framebuffer)
static void
glDeleteFramebuffersEXT(int[] framebuffers)
Array version of:DeleteFramebuffersEXT
static void
glDeleteFramebuffersEXT(java.nio.IntBuffer framebuffers)
static void
glDeleteRenderbuffersEXT(int renderbuffer)
static void
glDeleteRenderbuffersEXT(int[] renderbuffers)
Array version of:DeleteRenderbuffersEXT
static void
glDeleteRenderbuffersEXT(java.nio.IntBuffer renderbuffers)
static void
glFramebufferRenderbufferEXT(int target, int attachment, int renderbuffertarget, int renderbuffer)
static void
glFramebufferTexture1DEXT(int target, int attachment, int textarget, int texture, int level)
static void
glFramebufferTexture2DEXT(int target, int attachment, int textarget, int texture, int level)
static void
glFramebufferTexture3DEXT(int target, int attachment, int textarget, int texture, int level, int zoffset)
static void
glGenerateMipmapEXT(int target)
static int
glGenFramebuffersEXT()
static void
glGenFramebuffersEXT(int[] framebuffers)
Array version of:GenFramebuffersEXT
static void
glGenFramebuffersEXT(java.nio.IntBuffer framebuffers)
static int
glGenRenderbuffersEXT()
static void
glGenRenderbuffersEXT(int[] renderbuffers)
Array version of:GenRenderbuffersEXT
static void
glGenRenderbuffersEXT(java.nio.IntBuffer renderbuffers)
static int
glGetFramebufferAttachmentParameteriEXT(int target, int attachment, int pname)
static void
glGetFramebufferAttachmentParameterivEXT(int target, int attachment, int pname, int[] params)
Array version of:GetFramebufferAttachmentParameterivEXT
static void
glGetFramebufferAttachmentParameterivEXT(int target, int attachment, int pname, java.nio.IntBuffer params)
static int
glGetRenderbufferParameteriEXT(int target, int pname)
static void
glGetRenderbufferParameterivEXT(int target, int pname, int[] params)
Array version of:GetRenderbufferParameterivEXT
static void
glGetRenderbufferParameterivEXT(int target, int pname, java.nio.IntBuffer params)
static boolean
glIsFramebufferEXT(int framebuffer)
static boolean
glIsRenderbufferEXT(int renderbuffer)
static void
glRenderbufferStorageEXT(int target, int internalformat, int width, int height)
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Field Detail
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GL_FRAMEBUFFER_EXT
Accepted by thetarget
parameter of BindFramebufferEXT, CheckFramebufferStatusEXT, FramebufferTexture{1D|2D|3D}EXT, FramebufferRenderbufferEXT, and GetFramebufferAttachmentParameterivEXT.
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GL_RENDERBUFFER_EXT
Accepted by thetarget
parameter of BindRenderbufferEXT, RenderbufferStorageEXT, and GetRenderbufferParameterivEXT, and returned by GetFramebufferAttachmentParameterivEXT.
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GL_STENCIL_INDEX1_EXT, GL_STENCIL_INDEX4_EXT, GL_STENCIL_INDEX8_EXT, GL_STENCIL_INDEX16_EXT
Accepted by theinternalformat
parameter of RenderbufferStorageEXT.
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GL_RENDERBUFFER_WIDTH_EXT, GL_RENDERBUFFER_HEIGHT_EXT, GL_RENDERBUFFER_INTERNAL_FORMAT_EXT, GL_RENDERBUFFER_RED_SIZE_EXT, GL_RENDERBUFFER_GREEN_SIZE_EXT, GL_RENDERBUFFER_BLUE_SIZE_EXT, GL_RENDERBUFFER_ALPHA_SIZE_EXT, GL_RENDERBUFFER_DEPTH_SIZE_EXT, GL_RENDERBUFFER_STENCIL_SIZE_EXT
Accepted by thepname
parameter of GetRenderbufferParameterivEXT.
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GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE_EXT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME_EXT, GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL_EXT, GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE_EXT, GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_3D_ZOFFSET_EXT
Accepted by thepname
parameter of GetFramebufferAttachmentParameterivEXT.
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GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT, GL_COLOR_ATTACHMENT4_EXT, GL_COLOR_ATTACHMENT5_EXT, GL_COLOR_ATTACHMENT6_EXT, GL_COLOR_ATTACHMENT7_EXT, GL_COLOR_ATTACHMENT8_EXT, GL_COLOR_ATTACHMENT9_EXT, GL_COLOR_ATTACHMENT10_EXT, GL_COLOR_ATTACHMENT11_EXT, GL_COLOR_ATTACHMENT12_EXT, GL_COLOR_ATTACHMENT13_EXT, GL_COLOR_ATTACHMENT14_EXT, GL_COLOR_ATTACHMENT15_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_STENCIL_ATTACHMENT_EXT
Accepted by theattachment
parameter of FramebufferTexture{1D|2D|3D}EXT, FramebufferRenderbufferEXT, and GetFramebufferAttachmentParameterivEXT.
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GL_FRAMEBUFFER_COMPLETE_EXT, GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT, GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT, GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT, GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT, GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT, GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT, GL_FRAMEBUFFER_UNSUPPORTED_EXT
Returned by CheckFramebufferStatusEXT().
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GL_FRAMEBUFFER_BINDING_EXT, GL_RENDERBUFFER_BINDING_EXT, GL_MAX_COLOR_ATTACHMENTS_EXT, GL_MAX_RENDERBUFFER_SIZE_EXT
Accepted by GetIntegerv().
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GL_INVALID_FRAMEBUFFER_OPERATION_EXT
Returned by GetError().
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Method Detail
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glIsRenderbufferEXT
public static boolean glIsRenderbufferEXT(int renderbuffer)
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glBindRenderbufferEXT
public static void glBindRenderbufferEXT(int target, int renderbuffer)
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glDeleteRenderbuffersEXT
public static void glDeleteRenderbuffersEXT(java.nio.IntBuffer renderbuffers)
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glDeleteRenderbuffersEXT
public static void glDeleteRenderbuffersEXT(int renderbuffer)
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glGenRenderbuffersEXT
public static void glGenRenderbuffersEXT(java.nio.IntBuffer renderbuffers)
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glGenRenderbuffersEXT
public static int glGenRenderbuffersEXT()
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glRenderbufferStorageEXT
public static void glRenderbufferStorageEXT(int target, int internalformat, int width, int height)
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glGetRenderbufferParameterivEXT
public static void glGetRenderbufferParameterivEXT(int target, int pname, java.nio.IntBuffer params)
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glGetRenderbufferParameteriEXT
public static int glGetRenderbufferParameteriEXT(int target, int pname)
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glIsFramebufferEXT
public static boolean glIsFramebufferEXT(int framebuffer)
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glBindFramebufferEXT
public static void glBindFramebufferEXT(int target, int framebuffer)
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glDeleteFramebuffersEXT
public static void glDeleteFramebuffersEXT(java.nio.IntBuffer framebuffers)
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glDeleteFramebuffersEXT
public static void glDeleteFramebuffersEXT(int framebuffer)
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glGenFramebuffersEXT
public static void glGenFramebuffersEXT(java.nio.IntBuffer framebuffers)
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glGenFramebuffersEXT
public static int glGenFramebuffersEXT()
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glCheckFramebufferStatusEXT
public static int glCheckFramebufferStatusEXT(int target)
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glFramebufferTexture1DEXT
public static void glFramebufferTexture1DEXT(int target, int attachment, int textarget, int texture, int level)
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glFramebufferTexture2DEXT
public static void glFramebufferTexture2DEXT(int target, int attachment, int textarget, int texture, int level)
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glFramebufferTexture3DEXT
public static void glFramebufferTexture3DEXT(int target, int attachment, int textarget, int texture, int level, int zoffset)
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glFramebufferRenderbufferEXT
public static void glFramebufferRenderbufferEXT(int target, int attachment, int renderbuffertarget, int renderbuffer)
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glGetFramebufferAttachmentParameterivEXT
public static void glGetFramebufferAttachmentParameterivEXT(int target, int attachment, int pname, java.nio.IntBuffer params)
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glGetFramebufferAttachmentParameteriEXT
public static int glGetFramebufferAttachmentParameteriEXT(int target, int attachment, int pname)
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glGenerateMipmapEXT
public static void glGenerateMipmapEXT(int target)
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glDeleteRenderbuffersEXT
public static void glDeleteRenderbuffersEXT(int[] renderbuffers)
Array version of:DeleteRenderbuffersEXT
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glGenRenderbuffersEXT
public static void glGenRenderbuffersEXT(int[] renderbuffers)
Array version of:GenRenderbuffersEXT
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glGetRenderbufferParameterivEXT
public static void glGetRenderbufferParameterivEXT(int target, int pname, int[] params)
Array version of:GetRenderbufferParameterivEXT
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glDeleteFramebuffersEXT
public static void glDeleteFramebuffersEXT(int[] framebuffers)
Array version of:DeleteFramebuffersEXT
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glGenFramebuffersEXT
public static void glGenFramebuffersEXT(int[] framebuffers)
Array version of:GenFramebuffersEXT
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glGetFramebufferAttachmentParameterivEXT
public static void glGetFramebufferAttachmentParameterivEXT(int target, int attachment, int pname, int[] params)
Array version of:GetFramebufferAttachmentParameterivEXT
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