diff options
author | Peter Waller <p@pwaller.net> | 2014-04-30 16:13:15 +0100 |
---|---|---|
committer | Peter Waller <p@pwaller.net> | 2014-04-30 16:13:15 +0100 |
commit | 38537f1ab9406d0349dde5dc4abc32c3926d3e80 (patch) | |
tree | 1dfa25aed3329df4731f9979a294bc4db8666610 | |
parent | 492ce621db79a5f85dcb6d07fceae598dba3eb75 (diff) | |
parent | bf02117a1e15dcefb8a0478b8f82b0eb4fd396d0 (diff) | |
download | gl-38537f1ab9406d0349dde5dc4abc32c3926d3e80.tar.gz |
Merge pull request #144 from PolyFloyd/buffermap
Added MapBuffer convenience functions for slices
-rw-r--r-- | buffer.go | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -7,6 +7,7 @@ package gl // #include "gl.h" import "C" import "unsafe" +import "reflect" // Buffer Objects @@ -81,6 +82,30 @@ func MapBuffer(target GLenum, access GLenum) unsafe.Pointer { return unsafe.Pointer(C.glMapBuffer(C.GLenum(target), C.GLenum(access))) } +// Maps the buffer with MapBuffer() and returns a pointer to the slice pointing +// to the mapped buffer. See also the MapBuffer<Type> convenience functions. +// WARNING: This function makes use of reflect.SliceHeader which may reduce +// portability of your application. See the reflect.SliceHeader documentation +// for more information. +func MapBufferSlice(target GLenum, access GLenum, bytesPerElement int) unsafe.Pointer { + rawLength := int(GetBufferParameteriv(target, BUFFER_SIZE)) + return unsafe.Pointer(&reflect.SliceHeader{ + Data: uintptr(MapBuffer(target, access)), + Len: rawLength / bytesPerElement, + Cap: rawLength / bytesPerElement, + }) +} + +// Map a buffer object's data store and return it as a slice +func MapBufferFloat32(target GLenum, access GLenum) []float32 { + return *(*[]float32)(MapBufferSlice(target, access, 4)) +} + +// Map a buffer object's data store and return it as a slice +func MapBufferUint32(target GLenum, access GLenum) []uint32 { + return *(*[]uint32)(MapBufferSlice(target, access, 4)) +} + // Unmap a buffer object's data store func UnmapBuffer(target GLenum) bool { return goBool(C.glUnmapBuffer(C.GLenum(target))) |