-! (c)2009 Joe Groff bsd license
-USING: alien byte-arrays destructors help.markup help.syntax kernel math
-quotations ;
+! Copyright (C) 2009 Joe Groff.
+! See http://factorcode.org/license.txt for BSD license.
+USING: alien byte-arrays destructors help.markup help.syntax
+math ;
IN: gpu.buffers
HELP: <buffer-ptr>
}
{ $description "Discards any memory currently held by " { $snippet "buffer" } " and reallocates a new memory block of " { $snippet "size" } " bytes for it. If " { $snippet "initial-data" } " is not " { $link f } ", " { $snippet "size" } " bytes are copied from " { $snippet "initial-data" } " into the buffer to initialize it; otherwise, the buffer content is left uninitialized." } ;
+HELP: allocate-byte-array
+{ $values
+ { "buffer" buffer } { "byte-array" byte-array }
+}
+{ $description "Discards any memory currently held by " { $snippet "buffer" } " and reallocates a new memory block large enough to store " { $snippet "byte-array" } ". The contents of " { $snippet "byte-array" } " are then copied into the buffer." } ;
+
HELP: buffer
{ $class-description "Objects of this class represent GPU-accessible memory buffers. Buffer objects can be used to store vertex data and to update or read pixel data from textures and framebuffers without CPU involvement. The data inside buffer objects may be resident in main memory or different parts of GPU memory; the graphics driver will choose a location for a buffer based on usage hints specified when the buffer object is constructed with " { $link <buffer> } " or " { $link byte-array>buffer } ":"
{ $list
{ $class-description { $snippet "buffer-upload-pattern" } " values aid the graphics driver in optimizing access to " { $link buffer } " objects by declaring the frequency with which the buffer will be supplied new data."
{ $list
{ { $link stream-upload } " declares that the buffer data will only be used a few times before being deallocated by " { $link dispose } " or replaced by " { $link allocate-buffer } "." }
-{ { $link static-upload } " declares that the buffer data will be provided once and accessed frequently without modification." }
+{ { $link static-upload } " declares that the buffer data will be provided once and accessed frequently without modification." }
{ { $link dynamic-upload } " declares that the buffer data will be frequently modified." }
}
"A " { $snippet "buffer-upload-pattern" } " is only a declaration and does not actually control access to the underlying buffer data." } ;
{ $list
{ { $link draw-usage } " declares that the buffer will be supplied with data from CPU memory and read from by the GPU for vertex or texture image data." }
{ { $link read-usage } " declares that the buffer will be supplied with data from other GPU resources and read from primarily by the CPU." }
-{ { $link copy-usage } " declares that the buffer will both receive and supply data primarily for other GPU resources." }
+{ { $link copy-usage } " declares that the buffer will both receive and supply data primarily for other GPU resources." }
}
"A " { $snippet "buffer-usage-pattern" } " is only a declaration and does not actually control access to the underlying buffer data." } ;
HELP: gpu-data-ptr
{ $class-description "This class is a union of the " { $link c-ptr } " and " { $link buffer-ptr } " classes. It represents a value that can be supplied either from CPU or GPU memory." } ;
+HELP: grow-buffer
+{ $values { "buffer" buffer } { "target-size" integer } }
+{ $description "If the " { $link buffer-size } " of the given " { $link buffer } " is less than " { $snippet "target-size" } ", reallocates the buffer to a size large enough to accommodate " { $snippet "target-size" } " bytes. If the buffer is reallocated, the original contents are lost." } ;
+
HELP: index-buffer
{ $class-description "This " { $link buffer-kind } " declares that a " { $link buffer } "'s primary use will be to index vertex arrays." } ;
HELP: with-mapped-buffer
{ $values
- { "buffer" buffer } { "access" buffer-access-mode } { "quot" { $quotation "( alien -- )" } }
+ { "buffer" buffer } { "access" buffer-access-mode } { "quot" { $quotation ( ..a alien -- ..b ) } }
}
{ $description "Maps " { $snippet "buffer" } " into CPU address space with " { $snippet "access" } " for the dynamic extent of " { $snippet "quot" } ". " { $snippet "quot" } " is called with a pointer to the mapped memory on top of the stack." } ;
-{ allocate-buffer buffer-size update-buffer read-buffer copy-buffer with-mapped-buffer } related-words
+HELP: with-mapped-buffer-array
+{ $values
+ { "buffer" buffer } { "access" buffer-access-mode } { "c-type" "a C type" } { "quot" { $quotation ( ..a array -- ..b ) } }
+}
+{ $description "Maps " { $snippet "buffer" } " into CPU address space with " { $snippet "access" } " for the dynamic extent of " { $snippet "quot" } ". " { $snippet "quot" } " is called with the pointer to the mapped memory wrapped in a specialized array of " { $snippet "c-type" } "." }
+{ $notes "The appropriate specialized array vocabulary must be loaded; otherwise, an error will be thrown. See the " { $vocab-link "specialized-arrays" } " vocabulary for details on the underlying sequence type constructed." } ;
+
+{ allocate-buffer allocate-byte-array buffer-size update-buffer read-buffer copy-buffer with-mapped-buffer } related-words
HELP: write-access
{ $class-description "This " { $link buffer-access-mode } " value requests write-only access when mapping a buffer object through " { $link with-mapped-buffer } "." } ;
"Manipulating buffer data:"
{ $subsections
allocate-buffer
+ allocate-byte-array
+ grow-buffer
update-buffer
read-buffer
copy-buffer
with-mapped-buffer
-}
-;
+ with-mapped-buffer-array
+} ;
ABOUT: "gpu.buffers"
projects / factor.git / blobdiff