func NewSprite(vertices []float32, program *gg.Program, texture *gg.Texture) (*Sprite, error) {
buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.LittleEndian, vertices); err != nil {
return nil, err
}
pvbo := gg.CreateBuffer()
gg.BindBuffer(gg.ARRAY_BUFFER, pvbo)
gg.BufferData(gg.ARRAY_BUFFER, buf.Bytes(), gg.STATIC_DRAW)
texVertices := []float32{
0, 0,
0, 1,
1, 1,
1, 0,
}
buf.Reset()
if err := binary.Write(buf, binary.LittleEndian, texVertices); err != nil {
return nil, err
}
tvbo := gg.CreateBuffer()
gg.BindBuffer(gg.ARRAY_BUFFER, tvbo)
gg.BufferData(gg.ARRAY_BUFFER, buf.Bytes(), gg.STATIC_DRAW)
return &Sprite{
pvbo: pvbo,
tvbo: tvbo,
program: program,
tex: texture,
}, nil
}
func NewTriangle(vertices []float32, program *gg.Program) (*Triangle, error) {
buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.LittleEndian, vertices); err != nil {
return nil, err
}
vbo := gg.CreateBuffer()
gg.BindBuffer(gg.ARRAY_BUFFER, vbo)
gg.BufferData(gg.ARRAY_BUFFER, buf.Bytes(), gg.STATIC_DRAW)
return &Triangle{
vbo: vbo,
program: program,
}, nil
}
func NewSprite(width, height float32, program *gg.Program, texture *gg.Texture) *Sprite {
s := &Sprite{
scale: 1,
width: width,
height: height,
tex: texture,
program: program,
}
pvertices := []float32{
0, 0, 0,
0, s.height, 0,
s.width, s.height, 0,
s.width, 0, 0,
}
buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.LittleEndian, pvertices); err != nil {
panic(err)
}
s.pbuf = gg.CreateBuffer()
gg.BindBuffer(gg.ARRAY_BUFFER, s.pbuf)
gg.BufferData(gg.ARRAY_BUFFER, buf.Bytes(), gg.STATIC_DRAW)
tvertices := []float32{
0, 0,
0, 1,
1, 1,
1, 0,
}
buf.Reset()
if err := binary.Write(buf, binary.LittleEndian, tvertices); err != nil {
panic(err)
}
s.tbuf = gg.CreateBuffer()
gg.BindBuffer(gg.ARRAY_BUFFER, s.tbuf)
gg.BufferData(gg.ARRAY_BUFFER, buf.Bytes(), gg.STATIC_DRAW)
return s
}