GLGETFRAMEBUFFERATTA - Online Linux Manual PageSection : 3G
Updated : 01/20/2022
Source : [FIXME: source]
Note : [FIXME: manual]

NAMEglGetFramebufferAttachmentParameteriv, glGetNamedFramebufferAttachmentParameteriv − retrieve information about attachments of a framebuffer object

C SPECIFICATIONvoid glGetFramebufferAttachmentParameteriv(GLenum target, GLenum attachment, GLenum pname, GLint *params); void glGetNamedFramebufferAttachmentParameteriv(GLuint framebuffer, GLenum attachment, GLenum pname, GLint *params);

PARAMETERStarget Specifies the target to which the framebuffer object is bound for glGetFramebufferAttachmentParameteriv​. framebuffer Specifies the name of the framebuffer object for glGetNamedFramebufferAttachmentParameteriv​. attachment Specifies the attachment of the framebuffer object to query​. pname Specifies the parameter of attachment to query​. params Returns the value of parameter pname for attachment​.

DESCRIPTIONglGetFramebufferAttachmentParameteriv and glGetNamedFramebufferAttachmentParameteriv return parameters of attachments of a specified framebuffer object​. For glGetFramebufferAttachmentParameteriv, the framebuffer object is that bound to target, which must be one of GL_DRAW_FRAMEBUFFER, GL_READ_FRAMEBUFFER or GL_FRAMEBUFFER​. GL_FRAMEBUFFER is equivalent to GL_DRAW_FRAMEBUFFER​. Buffers of default framebuffers may also be queried if bound to target​. For glGetNamedFramebufferAttachmentParameteriv, framebuffer is the name of the framebuffer object​. If framebuffer is zero, the default draw framebuffer is queried​. If the specified framebuffer is a framebuffer object, attachment must be one of GL_DEPTH_ATTACHMENT, GL_STENCIL_ATTACHMENT GL_DEPTH_STENCIL_ATTACHMENT, or GL_COLOR_ATTACHMENTi, where i is between zero and the value of GL_MAX_COLOR_ATTACHMENTS minus one​. If the specified framebuffer is a default framebuffer, target, attachment must be one of GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT, GL_BACK_RIGHT, GL_DEPTH or GL_STENCIL, identifying the corresponding buffer​. If attachment is GL_DEPTH_STENCIL_ATTACHMENT, the same object must be bound to both the depth and stencil attachment points of the framebuffer object, and information about that object is returned​. Upon successful return, if pname is GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, then params will contain one of GL_NONE, GL_FRAMEBUFFER_DEFAULT, GL_TEXTURE, or GL_RENDERBUFFER, identifying the type of object which contains the attached image​. Other values accepted for pname depend on the type of object, as described below​. If the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE is GL_NONE, then either no framebuffer is bound to target; or a default framebuffer is queried, attachment is GL_DEPTH or GL_STENCIL, and the number of depth or stencil bits, respectively, is zero​. In this case querying pname GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME will return zero, and all other queries will generate an error​. If the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE is not GL_NONE, these queries apply to all other framebuffer types: •  If pname is GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE, GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE, GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE, GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE, GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE or GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE, then params will contain the number of bits in the corresponding red, green, blue, alpha, depth, or stencil component of the specified attachment​. If the requested component is not present in the attachment, or if no data storage or texture image has been specified for the attachment, then params will contain zero​. •  If pname is GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE, then params will contain the format of components of the specified attachment, one of GL_FLOAT, GL_INT, GL_UNSIGNED_INT, GL_SIGNED_NORMALIZED, or GL_UNSIGNED_NORMALIZED for floating−point, signed integer, unsigned integer, signed normalized fixed−point, or unsigned normalized fixed−point components respectively​. Only color buffers may have integer components​. If no data storage or texture image has been specified for the attachment, then params will contain GL_NONE​. This query cannot be performed for a combined depth+stencil attachment, since it does not have a single format​. •  If pname is GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING, then params will contain the encoding of components of the specified attachment, one of GL_LINEAR or GL_SRGB for linear or sRGB−encoded components, respectively​. Only color buffer components may be sRGB−encoded; such components are treated as described in the OpenGL Specification​. For a default framebuffer, color encoding is determined by the implementation​. For framebuffer objects, components are sRGB−encoded if the internal format of a color attachment is one of the color−renderable SRGB formats​. If the attachment is not a color attachment, or if no data storage or texture image has been specified for the attachment, then params will contain GL_LINEAR​. If the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE is GL_RENDERBUFFER, then •  If pname is GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, params will contain the name of the renderbuffer object which contains the attached image​. If the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE is GL_TEXTURE, then •  If pname is GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, then params will contain the name of the texture object which contains the attached image​. •  If pname is GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL, then params will contain the mipmap level of the texture object which contains the attached image​. •  If pname is GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE and the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME is the name of a cube map texture object, then params will contain the cube map face of the cubemap texture object which contains the attached image​. Otherwise params will contain zero​. •  If pname is GL_FRAMEBUFFER_ATTACHMENT_LAYERED, then params will contain GL_TRUE if an entire level of a three−dimensional texture, cube map texture, or one−or two−dimensional array texture is attached​. Otherwise, params will contain GL_FALSE​. •  If pname is GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER; the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME is the name of a three−dimensional, or a one− or two−dimensional array texture; and the value of GL_FRAMEBUFFER_ATTACHMENT_LAYERED is GL_FALSE, then params will contain the texture layer which contains the attached image​. Otherwise params will contain zero​.

NOTESThe GL_FRAMEBUFFER_ATTACHMENT_LAYERED query is supported only if the GL version is 3​.2 or greater​.

ERRORSGL_INVALID_ENUM is generated by glGetFramebufferAttachmentParameteriv if target is not one of the accepted framebuffer targets​. GL_INVALID_OPERATION is generated by glGetNamedFramebufferAttachmentParameteriv if framebuffer is not zero or the name of an existing framebuffer object​. GL_INVALID_ENUM is generated if pname is not valid for the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, as described above​. GL_INVALID_OPERATION is generated if attachment is not one of the accepted framebuffer attachment points, as described above​. GL_INVALID_OPERATION is generated if the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE is GL_NONE and pname is not GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME or GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE​. GL_INVALID_OPERATION is generated if attachment is GL_DEPTH_STENCIL_ATTACHMENT and different objects are bound to the depth and stencil attachment points of target​. GL_INVALID_OPERATION is generated if attachment is GL_DEPTH_STENCIL_ATTACHMENT and pname is GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE​.

VERSION SUPPORT OpenGL Version Function / Feature Name 2​.0 none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'> 2​.1 3​.0 3​.1 3​.2 3​.3 4​.0 4​.1 4​.2 4​.3 4​.4 4​.5 glGetFramebufferAttachmentParameteriv glGetNamedFramebufferAttachmentParameteriv

SEE ALSOglGenFramebuffers(), glBindFramebuffer() glGetFramebufferParameter()

COPYRIGHTCopyright © 2010−2014 Khronos Group​. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1​.0, 8 June 1999​. http://opencontent​.org/openpub/​.

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