// CreateProgram creates, compiles, and links a gl.Program.
func CreateProgram(vertexSrc, fragmentSrc string) (gl.Program, error) {
program := gl.CreateProgram()
if !program.Valid() {
return gl.Program{}, fmt.Errorf("glutil: no programs available")
}
vertexShader, err := loadShader(gl.VERTEX_SHADER, vertexSrc)
if err != nil {
return gl.Program{}, err
}
fragmentShader, err := loadShader(gl.FRAGMENT_SHADER, fragmentSrc)
if err != nil {
gl.DeleteShader(vertexShader)
return gl.Program{}, err
}
gl.AttachShader(program, vertexShader)
gl.AttachShader(program, fragmentShader)
gl.LinkProgram(program)
// Flag shaders for deletion when program is unlinked.
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShader)
if gl.GetProgrami(program, gl.LINK_STATUS) == 0 {
defer gl.DeleteProgram(program)
return gl.Program{}, fmt.Errorf("glutil: %s", gl.GetProgramInfoLog(program))
}
return program, nil
}
func (s *glShader) deleteShader() {
if s.program.Valid() {
gl.DeleteProgram(s.program)
}
if s.vertex.Valid() {
gl.DeleteShader(s.vertex)
}
if s.fragment.Valid() {
gl.DeleteShader(s.fragment)
}
}
func (s *shaderProgram) destroy(ctx *context) {
gl.DeleteProgram(s.program)
s.program = gl.Program{}
// TODO: Delete shaders.
ctx.stats.shaderProgramCount--
}