func compile(source string, ty int) gl.Shader {
shader := gl.CreateShader(gl.Enum(ty))
gl.ShaderSource(shader, source)
gl.CompileShader(shader)
if gl.GetShaderi(shader, gl.COMPILE_STATUS) != gl.TRUE {
panic(gl.GetShaderInfoLog(shader))
}
checkError()
return shader
}
func loadShader(shaderType gl.Enum, src string) (gl.Shader, error) {
shader := gl.CreateShader(shaderType)
if !shader.Valid() {
return gl.Shader{}, fmt.Errorf("glutil: could not create shader (type %v)", shaderType)
}
gl.ShaderSource(shader, src)
gl.CompileShader(shader)
if gl.GetShaderi(shader, gl.COMPILE_STATUS) == 0 {
defer gl.DeleteShader(shader)
return gl.Shader{}, fmt.Errorf("shader compile: %s", gl.GetShaderInfoLog(shader))
}
return shader, nil
}
func (s *glShader) createShader(name, header, opts, vShader, fShader string) error {
program := gl.CreateProgram()
vertexShader := gl.CreateShader(gl.VERTEX_SHADER)
gl.ShaderSource(vertexShader, strings.Join([]string{header, opts, vShader}, "\n"))
gl.CompileShader(vertexShader)
status := gl.Enum(gl.GetShaderi(vertexShader, gl.COMPILE_STATUS))
if status != gl.TRUE {
return dumpShaderError(vertexShader, name, "vert")
}
fragmentShader := gl.CreateShader(gl.FRAGMENT_SHADER)
gl.ShaderSource(fragmentShader, strings.Join([]string{header, opts, fShader}, "\n"))
gl.CompileShader(fragmentShader)
status = gl.Enum(gl.GetShaderi(fragmentShader, gl.COMPILE_STATUS))
if status != gl.TRUE {
return dumpShaderError(fragmentShader, name, "vert")
}
gl.AttachShader(program, vertexShader)
gl.AttachShader(program, fragmentShader)
gl.LinkProgram(program)
status = gl.Enum(gl.GetProgrami(program, gl.LINK_STATUS))
if status != gl.TRUE {
return dumpProgramError(program, name)
}
s.vertexAttrib = gl.GetAttribLocation(program, "vertex")
s.tcoordAttrib = gl.GetAttribLocation(program, "tcoord")
s.program = program
s.vertex = vertexShader
s.fragment = fragmentShader
return nil
}