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"))
}
func (s *Shader) initUniform(name string, uni *gl.Int) {
uni_name := gl.GLString(name)
defer gl.GLStringFree(uni_name)
*uni = gl.GetUniformLocation(s.program, uni_name)
if *uni == -1 {
fmt.Println("Error in getting uniform", gl.GoString(uni_name))
}
}
func SetUniform4F(shader, variable string, vs []float32) error {
prog, ok := shader_progs[shader]
if !ok {
return shaderError(fmt.Sprintf("Tried to set a uniform in an unknown shader '%s'", shader))
}
bvariable := []byte(fmt.Sprintf("%s\x00", variable))
loc := gl.GetUniformLocation(prog, (*gl.Char)(unsafe.Pointer(&bvariable[0])))
gl.Uniform4f(loc, gl.Float(vs[0]), gl.Float(vs[1]), gl.Float(vs[2]), gl.Float(vs[3]))
return nil
}
func SetUniformI(shader, variable string, n int) error {
prog, ok := shader_progs[shader]
if !ok {
return shaderError(fmt.Sprintf("Tried to set a uniform in an unknown shader '%s'", shader))
}
bvariable := []byte(fmt.Sprintf("%s\x00", variable))
loc := gl.GetUniformLocation(prog, (*gl.Char)(unsafe.Pointer(&bvariable[0])))
gl.Uniform1i(loc, gl.Int(n))
return nil
}
func SetUniformF(shader, variable string, f float32) {
prog, ok := shader_progs[shader]
if !ok {
if !warned_names[shader] {
Warn().Printf("Tried to set a uniform in an unknown shader '%s'", shader)
warned_names[shader] = true
}
return
}
bvariable := []byte(fmt.Sprintf("%s\x00", variable))
loc := gl.GetUniformLocation(prog, (*gl.Char)(unsafe.Pointer(&bvariable[0])))
gl.Uniform1f(loc, f)
}
func SetUniformV2Array(shader, variable string, vs []linear.Vec2) {
prog, ok := shader_progs[shader]
if !ok {
if !warned_names[shader] {
Warn().Printf("Tried to set a uniform in an unknown shader '%s'", shader)
warned_names[shader] = true
}
return
}
bvariable := []byte(fmt.Sprintf("%s\x00", variable))
loc := gl.GetUniformLocation(prog, (*gl.Char)(unsafe.Pointer(&bvariable[0])))
var fs []gl.Float
for i := range vs {
fs = append(fs, gl.Float(vs[i].X))
fs = append(fs, gl.Float(vs[i].Y))
}
gl.Uniform2fv(loc, gl.Sizei(len(vs)), (*gl.Float)(unsafe.Pointer(&fs[0])))
}
func (effect *Effect) checkUniformVariable(variable string) {
if _, ok := effect.uniforms[variable]; !ok {
effect.uniforms[variable] = gl.GetUniformLocation(effect.program, gl.GLString(variable))
}
}