func EnableShader(name string) {
prog_obj, ok := shader_progs[name]
if ok {
gl.UseProgram(prog_obj)
} else {
gl.UseProgram(0)
if name != "" && !warned_names[name] {
Warn().Printf("Tried to use unknown shader '%s'", name)
warned_names[name] = true
}
}
}
func EnableShader(name string) error {
if name == "" {
gl.UseProgram(0)
return nil
}
prog_obj, ok := shader_progs[name]
if !ok {
return shaderError(fmt.Sprintf("Tried to use unknown shader '%s'", name))
}
gl.UseProgram(prog_obj)
return nil
}
func shinit() gl.Int {
vs := loadShader(gl.VERTEX_SHADER, vss)
var sfs string
if *blend {
sfs = bfss
} else {
sfs = fss
}
fs := loadShader(gl.FRAGMENT_SHADER, sfs)
prg := gl.CreateProgram()
gl.AttachShader(prg, vs)
gl.AttachShader(prg, fs)
gl.LinkProgram(prg)
var l int
if *blend {
l = 6
} else {
l = 3
}
gl.UseProgram(prg)
names := []string{"yt1", "cbt1", "crt1", "yt0", "cbt0", "crt0"}
for i := 0; i < l; i++ {
loc := gl.GetUniformLocation(prg, gl.GLString(names[i]))
gl.Uniform1i(loc, gl.Int(i))
}
return gl.GetUniformLocation(prg, gl.GLString("factor"))
}
// UseEffect sets the given Effect object for use in the following draw
// commands.
func UseEffect(effect *Effect) error {
gl.UseProgram(effect.program)
effect.uniforms = make(map[string]gl.Int)
paunchEffect = effect
return checkForErrors()
}
func (s *Shader) use() {
gl.UseProgram(s.program)
}
// DisableEffects disables all effects.
func DisableEffects() {
gl.UseProgram(0)
paunchEffect = nil
}