func newProgram(vertexShaderSource, fragmentShaderSource string) (uint32, error) {
vertexShader, err := compileShader(vertexShaderSource, gl.VERTEX_SHADER)
if err != nil {
return 0, err
}
fragmentShader, err := compileShader(fragmentShaderSource, gl.FRAGMENT_SHADER)
if err != nil {
return 0, err
}
program := gl.CreateProgram()
gl.AttachShader(program, vertexShader)
gl.AttachShader(program, fragmentShader)
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return 0, fmt.Errorf("failed to link program: %v", log)
}
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShader)
return program, nil
}
func LoadShaders(shaders []ShaderInfo) (uint32, error) {
program := gl.CreateProgram()
for _, shaderInfo := range shaders {
shader, err := shaderInfo.CompileShader()
if err != nil {
return 0, err
}
gl.AttachShader(program, shader)
gl.DeleteShader(shader)
}
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return 0, fmt.Errorf("Failed to link program: %v", log)
}
return program, nil
}
func newProgram(shaders ...uint32) (uint32, error) {
program := gl.CreateProgram()
for _, shader := range shaders {
gl.AttachShader(program, shader)
}
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return 0, errors.New(fmt.Sprintf("failed to link program: %v", log))
}
for _, shader := range shaders {
gl.DeleteShader(shader)
}
return program, nil
}
func NewProgram(shaderSource map[string]string) (*GLSLProgram, error) {
var hasVertexShader bool
var hasFragmentShader bool
vertexShaderSource, ok := shaderSource["vertex"]
var vertexShader uint32
if ok {
vertexShader, err := compileShader(vertexShaderSource, gl.VERTEX_SHADER)
if err != nil {
return nil, err
}
hasVertexShader = true
}
fragmentShaderSource, ok := shaderSource["fragment"]
var fragmentShader uint32
if ok {
fragmentShader, err := compileShader(fragmentShaderSource, gl.FRAGMENT_SHADER)
if err != nil {
return nil, err
}
hasFragmentShader = true
}
program := gl.CreateProgram()
if !(hasVertexShader && hasFragmentShader) {
return nil, fmt.Errorf("Need vertex shader: %v, and fragment shader: %v", hasVertexShader, hasFragmentShader)
}
gl.AttachShader(program, vertexShader)
gl.AttachShader(program, fragmentShader)
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return nil, fmt.Errorf("Failed to link program(%v): %v", program, log)
}
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShader)
p := &GLSLProgram{program, vertexShaderSource, fragmentShaderSource, true}
return p, nil
}
func (p *Program) GetProgramInfoLog() string {
var logSize int32 = 0
gl.GetProgramiv(p.prog, gl.INFO_LOG_LENGTH, &logSize)
var infoLog []uint8 = make([]uint8, logSize)
gl.GetProgramInfoLog(p.prog, logSize, &logSize, &infoLog[0])
return gl.GoStr(&infoLog[0])
}
func newProgram(vertexShaderFilename, fragmentShaderFilename string) (uint32, error) {
program := gl.CreateProgram()
//vertexShaderSource, err := shaders.Asset(vertexShaderFilename)
//if err != nil {
// return 0, err
//}
vertexShader, err := shaders.Compile(vertexShaderSource, gl.VERTEX_SHADER)
if err != nil {
return 0, err
}
//fragmentShaderSource, err := shaders.Asset(fragmentShaderFilename)
//if err != nil {
// return 0, err
//}
fragmentShader, err := shaders.Compile(fragmentShaderSource, gl.FRAGMENT_SHADER)
if err != nil {
return 0, err
}
gl.AttachShader(program, vertexShader)
gl.AttachShader(program, fragmentShader)
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return 0, errors.New(fmt.Sprintf("failed to link program: %v", log))
}
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShader)
return program, nil
}
func (p *Program) ValidateProgram() error {
gl.ValidateProgram(p.prog)
var success int32 = gl.FALSE
gl.GetProgramiv(p.prog, gl.VALIDATE_STATUS, &success)
if success == gl.FALSE {
return fmt.Errorf("Failed to validate the program!\n%s", p.GetProgramInfoLog())
}
return nil
}
// loads shader objects and then attaches them to a program
func LoadShaderProgram(vertShader string, fragShader string, attribs []string) (*Program, error) {
// create the program
var prog uint32 = gl.CreateProgram()
var p *Program = &Program{prog, make(map[string]int32)}
// create the vertex shader
var vs uint32 = gl.CreateShader(gl.VERTEX_SHADER)
ShaderSource(vs, vertShader)
gl.CompileShader(vs)
var success int32 = gl.FALSE
gl.GetShaderiv(vs, gl.COMPILE_STATUS, &success)
if success == gl.FALSE {
return nil, fmt.Errorf("Failed to compile the vertex shader!\n%s", GetShaderInfoLog(vs))
}
// create the fragment shader
var fs uint32 = gl.CreateShader(gl.FRAGMENT_SHADER)
ShaderSource(fs, fragShader)
gl.CompileShader(fs)
success = gl.FALSE
gl.GetShaderiv(fs, gl.COMPILE_STATUS, &success)
if success == gl.FALSE {
return nil, fmt.Errorf("Failed to compile the fragment shader!\n%s", GetShaderInfoLog(fs))
}
// attach the shaders to the program and link
gl.AttachShader(prog, vs)
gl.AttachShader(prog, fs)
for i := 1; i <= len(attribs); i++ {
var attr_array []uint8 = StringToArray(attribs[i-1])
gl.BindAttribLocation(prog, uint32(i), &attr_array[0])
}
gl.LinkProgram(prog)
success = gl.FALSE
gl.GetProgramiv(prog, gl.LINK_STATUS, &success)
if success == gl.FALSE {
return nil, fmt.Errorf("Failed to link the program!\n%s", p.GetProgramInfoLog())
}
// at this point the shaders can be deleted
gl.DeleteShader(vs)
gl.DeleteShader(fs)
return p, nil
}