func initTriangleShaders() error {
var v gl.GLfloat = 0.0
data = []gl.GLfloat{
0.0, 0.8,
-0.8, -0.8,
0.8, -0.8,
}
vboTri = gl.GenBuffer()
// glGenBuffer(
// specify the current target buffer
vboTri.Bind(gl.ARRAY_BUFFER)
// create and init a buffer data
gl.BufferData(gl.ARRAY_BUFFER, len(data)*int(unsafe.Sizeof(v)), data, gl.STATIC_DRAW)
p, e := createProgram("triangle1.v", "triangle1.f")
if e != nil {
return e
}
program = p
return nil
}
func (v *Vbo) Create(usage gl.GLenum) {
v.usage = usage
if v.created {
return
}
if len(v.P) == 0 {
panic("No position data specified")
}
sizep := len(v.P) * 3 * 8 / 2
sizen := len(v.N) * 3 * 8 / 2
sizet := len(v.T) * 2 * 8 / 2
sizei := len(v.I) * 1 * 4
//refill in simpler slices:
v.p = make([]float32, 0, len(v.P)*3)
v.n = make([]float32, 0, len(v.N)*3)
v.t = make([]float32, 0, len(v.T)*2)
for _, x := range v.P {
v.p = append(v.p, float32(x.X), float32(x.Y), float32(x.Z))
}
for _, x := range v.N {
v.n = append(v.n, float32(x.X), float32(x.Y), float32(x.Z))
}
for _, x := range v.T {
v.t = append(v.t, float32(x.X), float32(x.Y))
}
if v.idp == 0 {
v.idp = gl.GenBuffer()
}
if v.idn == 0 {
v.idn = gl.GenBuffer()
}
if v.idt == 0 {
v.idt = gl.GenBuffer()
}
if v.idi == 0 {
v.idi = gl.GenBuffer()
}
if v.idp*v.idn*v.idt*v.idi == 0 {
panic("Some buffer could not be generated")
}
nilSlc := []int32{0}
if len(v.I) > 0 {
v.idi.Bind(gl.ELEMENT_ARRAY_BUFFER)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, sizei, nilSlc, v.usage)
gl.BufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, sizei, nilSlc)
v.speci = true
}
UnbindIbo()
if len(v.P) > 0 {
v.idp.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, sizep, nilSlc, v.usage)
gl.BufferSubData(gl.ARRAY_BUFFER, 0, sizep, (&v.p[0]))
v.specp = true
}
if len(v.N) > 0 {
v.idn.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, sizen, nilSlc, v.usage)
gl.BufferSubData(gl.ARRAY_BUFFER, 0, sizen, (&v.n[0]))
v.specn = true
}
if len(v.T) > 0 {
v.idt.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, sizet, nilSlc, v.usage)
gl.BufferSubData(gl.ARRAY_BUFFER, 0, sizet, (&v.t[0]))
v.spect = true
}
UnbindVbo()
v.created = true
}