func initShaders() {
// Compile vertex shader
vshader := gl.CreateShader(gl.VERTEX_SHADER)
vshader.Source(vertexShaderSrc)
vshader.Compile()
if vshader.Get(gl.COMPILE_STATUS) != gl.TRUE {
panic("vertex shader compile error: " + vshader.GetInfoLog())
}
// Compile fragment shader
fshader := gl.CreateShader(gl.FRAGMENT_SHADER)
fragSrc, err := readShader("dist-field-raycaster.glsl")
if err != nil {
panic(err)
}
fshader.Source(fragSrc)
fshader.Compile()
if fshader.Get(gl.COMPILE_STATUS) != gl.TRUE {
panic("fragment shader compile error: " + fshader.GetInfoLog())
}
// Link program
prg = gl.CreateProgram()
prg.AttachShader(vshader)
prg.AttachShader(fshader)
prg.Link()
if prg.Get(gl.LINK_STATUS) != gl.TRUE {
panic("linker error: " + prg.GetInfoLog())
}
prg.Use()
}
func loadShader(typ gl.GLenum, filename string) (gl.Shader, error) {
if !strings.HasPrefix(filename, ".glsl") {
filename = filename + ".glsl"
}
src, e := ioutil.ReadFile(filename)
if e != nil {
logger.Println("read file:", e.Error())
return 0, e
}
//logger.Print(filename,"\n", string(src))
s := gl.CreateShader(typ)
s.Source(string(src))
s.Compile()
if s.Get(gl.COMPILE_STATUS) != gl.TRUE {
e := errors.New(s.GetInfoLog())
s.Delete()
return 0, e
}
return s, nil
}
func NewShader(isvert bool) *Shader {
type_ := gl.GLenum(gl.FRAGMENT_SHADER)
if isvert {
type_ = gl.GLenum(gl.VERTEX_SHADER)
}
id := gl.CreateShader(type_)
sh := &Shader{id, isvert}
return sh
}