func (s *Sprite) Draw() {
gg.UseProgram(s.program)
vattrib, err := gg.GetAttribLocation(s.program, "vertex_position")
if err != nil {
log.Fatal(err)
}
gg.EnableVertexAttribArray(vattrib)
gg.BindBuffer(gg.ARRAY_BUFFER, s.pvbo)
gg.VertexAttribPointer(vattrib, 3, gg.FLOAT, false, 0, 0)
tattrib, err := gg.GetAttribLocation(s.program, "vertex_texture")
if err != nil {
log.Fatal(err)
}
gg.EnableVertexAttribArray(tattrib)
gg.BindBuffer(gg.ARRAY_BUFFER, s.tvbo)
gg.VertexAttribPointer(tattrib, 2, gg.FLOAT, false, 0, 0)
gg.ActiveTexture(gg.TEXTURE0)
gg.BindTexture(gg.TEXTURE_2D, s.tex)
texUniform, err := gg.GetUniformLocation(s.program, "tex_loc")
if err != nil {
log.Fatal(err)
}
gg.Uniform1i(texUniform, 0)
gg.DrawArrays(gg.TRIANGLE_FAN, 0, 4)
}
func (s *Sprite) Draw() error {
gg.UseProgram(s.program)
model := s.transform()
modelUniform, err := gg.GetUniformLocation(s.program, "model")
if err != nil {
return err
}
gg.UniformMatrix4fv(modelUniform, model[:])
gg.ActiveTexture(gg.TEXTURE0)
gg.BindTexture(gg.TEXTURE_2D, s.tex)
textureUniform, err := gg.GetUniformLocation(s.program, "tex_loc")
if err != nil {
return err
}
gg.Uniform1i(textureUniform, 0)
vattrib, err := gg.GetAttribLocation(s.program, "vertex_position")
if err != nil {
return err
}
gg.EnableVertexAttribArray(vattrib)
gg.BindBuffer(gg.ARRAY_BUFFER, s.pbuf)
gg.VertexAttribPointer(vattrib, 3, gg.FLOAT, false, 0, 0)
tattrib, err := gg.GetAttribLocation(s.program, "vertex_texture")
if err != nil {
return err
}
gg.EnableVertexAttribArray(tattrib)
gg.BindBuffer(gg.ARRAY_BUFFER, s.tbuf)
gg.VertexAttribPointer(tattrib, 2, gg.FLOAT, false, 0, 0)
gg.DrawArrays(gg.TRIANGLE_FAN, 0, 4)
return nil
}