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// Copyright 2012 The go-gl Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gl
// #include "gl.h"
import "C"
import "unsafe"
import "reflect"
// Buffer Objects
type Buffer Object
// Create single buffer object
func GenBuffer() Buffer {
var b C.GLuint
C.glGenBuffers(1, &b)
return Buffer(b)
}
// Fill slice with new buffers
func GenBuffers(buffers []Buffer) {
if len(buffers) > 0 {
C.glGenBuffers(C.GLsizei(len(buffers)), (*C.GLuint)(&buffers[0]))
}
}
// Delete buffer object
func (buffer Buffer) Delete() {
b := C.GLuint(buffer)
C.glDeleteBuffers(1, &b)
}
// Delete all buffers in slice
func DeleteBuffers(buffers []Buffer) {
if len(buffers) > 0 {
C.glDeleteBuffers(C.GLsizei(len(buffers)), (*C.GLuint)(&buffers[0]))
}
}
// Bind this buffer as target
func (buffer Buffer) Bind(target GLenum) {
C.glBindBuffer(C.GLenum(target), C.GLuint(buffer))
}
// Remove buffer binding
func (buffer Buffer) Unbind(target GLenum) {
C.glBindBuffer(C.GLenum(target), C.GLuint(0))
}
// Bind this buffer as index of target
func (buffer Buffer) BindBufferBase(target GLenum, index uint) {
C.glBindBufferBase(C.GLenum(target), C.GLuint(index), C.GLuint(buffer))
}
// Bind this buffer range as index of target
func (buffer Buffer) BindBufferRange(target GLenum, index uint, offset int, size uint) {
C.glBindBufferRange(C.GLenum(target), C.GLuint(index), C.GLuint(buffer), C.GLintptr(offset), C.GLsizeiptr(size))
}
// Creates and initializes a buffer object's data store
func BufferData(target GLenum, size int, data interface{}, usage GLenum) {
C.glBufferData(C.GLenum(target), C.GLsizeiptr(size), ptr(data), C.GLenum(usage))
}
// Update a subset of a buffer object's data store
func BufferSubData(target GLenum, offset int, size int, data interface{}) {
C.glBufferSubData(C.GLenum(target), C.GLintptr(offset), C.GLsizeiptr(size),
ptr(data))
}
// Returns a subset of a buffer object's data store
func GetBufferSubData(target GLenum, offset int, size int, data interface{}) {
C.glGetBufferSubData(C.GLenum(target), C.GLintptr(offset),
C.GLsizeiptr(size), ptr(data))
}
// Map a buffer object's data store
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)))
}
// Return buffer pointer
func GetBufferPointerv(target GLenum, pname GLenum) unsafe.Pointer {
var ptr unsafe.Pointer
C.glGetBufferPointerv(C.GLenum(target), C.GLenum(pname), &ptr)
return ptr
}
// Return parameters of a buffer object
func GetBufferParameteriv(target GLenum, pname GLenum) int32 {
var param C.GLint
C.glGetBufferParameteriv(C.GLenum(target), C.GLenum(pname), ¶m)
return int32(param)
}
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