func (*backend) LinkProgram(p *gg.Program) error {
pv := p.Value.(uint32)
gl.LinkProgram(pv)
var status int32
gl.GetProgramiv(pv, gl.LINK_STATUS, &status)
if status == gl.TRUE {
return nil
}
var logLength int32
gl.GetProgramiv(pv, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(pv, logLength, nil, gl.Str(log))
return fmt.Errorf("link program: %s", log)
}
func (s *Shader) compile() error {
gl.LinkProgram(s.program)
var result int32
gl.GetProgramiv(s.program, gl.LINK_STATUS, &result)
if result == 0 {
return s.getProgramInfoLog("shader compilation error")
}
gl.ValidateProgram(s.program)
gl.GetProgramiv(s.program, gl.VALIDATE_STATUS, &result)
if result == 0 {
return s.getProgramInfoLog("shader compilation error: %s")
}
return nil
}
func initResources() (uint32, int32) {
vs := CreateShader("triangle.v.glsl", gl.VERTEX_SHADER)
fs := CreateShader("triangle.f.glsl", gl.FRAGMENT_SHADER)
var linkOk int32
program := gl.CreateProgram()
gl.AttachShader(program, vs)
gl.AttachShader(program, fs)
gl.LinkProgram(program)
gl.GetProgramiv(program, gl.LINK_STATUS, &linkOk)
if linkOk == 0 {
log.Fatal("gl.LinkProgram")
}
gl.GenBuffers(1, &vboTriangle)
gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
gl.BufferData(gl.ARRAY_BUFFER, 4*len(triangleVertices), gl.Ptr(triangleVertices), gl.STATIC_DRAW)
attribName := "coord2d\x00"
attribCoord2d := gl.GetAttribLocation(program, gl.Str(attribName))
if attribCoord2d == -1 {
log.Fatal("failed to bind attribute")
}
return program, attribCoord2d
}
func initResources() uint32 {
vs := CreateShader("triangle.v.glsl", gl.VERTEX_SHADER)
fs := CreateShader("triangle.f.glsl", gl.FRAGMENT_SHADER)
var linkOk int32
program := gl.CreateProgram()
gl.AttachShader(program, vs)
gl.AttachShader(program, fs)
gl.LinkProgram(program)
gl.GetProgramiv(program, gl.LINK_STATUS, &linkOk)
if linkOk == 0 {
log.Fatal("gl.LinkProgram")
}
gl.GenBuffers(1, &vboTriangle)
gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
gl.BufferData(gl.ARRAY_BUFFER, floatSize*len(triangleAttributes), gl.Ptr(triangleAttributes), gl.STATIC_DRAW)
attributeCoord2d = gl.GetAttribLocation(program, gl.Str("coord2d\x00"))
if attributeCoord2d == -1 {
log.Fatal("failed to bind attribute")
}
attributeVColor = gl.GetAttribLocation(program, gl.Str("v_color\x00"))
if attributeVColor == -1 {
log.Fatal("could not bind attribute v_color")
}
uniformFade = gl.GetUniformLocation(program, gl.Str("fade\x00"))
if uniformFade == -1 {
log.Fatal("could not bind uniform fade")
}
return program
}
func (s *Shader) getProgramInfoLog(context string) error {
var logLength int32
gl.GetProgramiv(s.program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(s.program, logLength, nil, gl.Str(log))
return fmt.Errorf("%s: %s", context, log)
}
func (s *Shader) getProgramInfoLog(context string) error {
var logLength int32
gl.GetProgramiv(s.program, gl.INFO_LOG_LENGTH, &logLength)
cLog, free := gl.Strs(strings.Repeat("\x00", int(logLength+1)))
defer free()
gl.GetProgramInfoLog(s.program, logLength, nil, *cLog)
return fmt.Errorf("%s: %s", context, cLog)
}
// GetProgramInfoLog returns the information log for a program.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetProgramInfoLog.xhtml
func GetProgramInfoLog(p Program) string {
var logLength int32
gl.GetProgramiv(p.Value, gl.INFO_LOG_LENGTH, &logLength)
if logLength == 0 {
return ""
}
logBuffer := make([]uint8, logLength)
gl.GetProgramInfoLog(p.Value, logLength, nil, &logBuffer[0])
return gl.GoStr(&logBuffer[0])
}
func NewProgram(vertexSource, fragmentSource string) (*Program, error) {
vertexId, err := newShader(vertexSource, gl.VERTEX_SHADER)
if err != nil {
return nil, err
}
fragmentId, err := newShader(fragmentSource, gl.FRAGMENT_SHADER)
if err != nil {
gl.DeleteShader(vertexId)
return nil, err
}
id := gl.CreateProgram()
if id == 0 {
gl.DeleteShader(vertexId)
gl.DeleteShader(fragmentId)
return nil, fmt.Errorf("Unable to allocate program")
}
gl.AttachShader(id, vertexId)
gl.AttachShader(id, fragmentId)
gl.LinkProgram(id)
var result int32
gl.GetProgramiv(id, gl.LINK_STATUS, &result)
if result == int32(gl.FALSE) {
var loglength int32
gl.GetProgramiv(id, gl.INFO_LOG_LENGTH, &loglength)
log := make([]byte, loglength)
var length int32
gl.GetProgramInfoLog(id, loglength, &length, &log[0])
gl.DeleteShader(vertexId)
gl.DeleteShader(fragmentId)
gl.DeleteProgram(id)
return nil, fmt.Errorf("Unable to link program: %s", log[:length])
}
return &Program{
id: id,
vertId: vertexId,
fragId: fragmentId,
uniforms: uniforms(id),
}, nil
}
func uniforms(id uint32) map[string]Uniform {
var maxlength int32
gl.GetProgramiv(id, gl.ACTIVE_UNIFORM_MAX_LENGTH, &maxlength)
var numuniforms int32
gl.GetProgramiv(id, gl.ACTIVE_UNIFORMS, &numuniforms)
buf := make([]byte, maxlength)
m := make(map[string]Uniform)
for index := uint32(0); index < uint32(numuniforms); index++ {
name, dt, siz := uniform(id, index, buf)
loc := gl.GetUniformLocation(id, &buf[0])
if loc == -1 {
panic(fmt.Errorf("Expected location for indexed uniform '%s'", name))
}
m[name] = Uniform{
name: name,
location: loc,
typ: dt,
siz: siz,
}
}
return m
}
func (c *Context) NewProgram(shaders []Shader) (Program, error) {
p := gl.CreateProgram()
if p == 0 {
return 0, errors.New("glCreateProgram failed")
}
for _, shader := range shaders {
gl.AttachShader(p, uint32(shader))
}
gl.LinkProgram(p)
var v int32
gl.GetProgramiv(p, gl.LINK_STATUS, &v)
if v == gl.FALSE {
return 0, errors.New("program error")
}
return Program(p), nil
}
// PrintLog prints the error log for an object
func PrintLog(object uint32) {
var logLength int32
if gl.IsShader(object) {
gl.GetShaderiv(object, gl.INFO_LOG_LENGTH, &logLength)
} else if gl.IsProgram(object) {
gl.GetProgramiv(object, gl.INFO_LOG_LENGTH, &logLength)
} else {
log.Fatal("PrintLog: not a shader or program")
}
infoLog := strings.Repeat("\x00", int(logLength+1))
if gl.IsShader(object) {
gl.GetShaderInfoLog(object, logLength, nil, gl.Str(infoLog))
} else if gl.IsProgram(object) {
gl.GetProgramInfoLog(object, logLength, nil, gl.Str(infoLog))
}
log.Fatal(infoLog)
}
func createProgram(vertShaderSrc string, fragShaderSrc string) uint32 {
vertShader := loadShader(gl.VERTEX_SHADER, vertShaderSrc)
fragShader := loadShader(gl.FRAGMENT_SHADER, fragShaderSrc)
prog := gl.CreateProgram()
gl.AttachShader(prog, vertShader)
gl.AttachShader(prog, fragShader)
gl.LinkProgram(prog)
var status int32
gl.GetProgramiv(prog, gl.LINK_STATUS, &status)
if status != gl.TRUE {
//log := gl.GetInfoLogARB(prog)
panic(fmt.Errorf("Failed to link program: , "))
}
return prog
}
func initResources() (uint32, int32) {
vSrc0 := fixupSrc(vShaderSrc)
vSrc := gl.Str(vSrc0)
vs := gl.CreateShader(gl.VERTEX_SHADER)
gl.ShaderSource(vs, 1, &vSrc, nil)
gl.CompileShader(vs)
var vok int32
gl.GetShaderiv(vs, gl.COMPILE_STATUS, &vok)
if vok == 0 {
log.Fatal("error in vertex shader")
}
fSrc := gl.Str(fShaderSrc)
fs := gl.CreateShader(gl.FRAGMENT_SHADER)
gl.ShaderSource(fs, 1, &fSrc, nil)
gl.CompileShader(fs)
var fok int32
gl.GetShaderiv(vs, gl.COMPILE_STATUS, &fok)
if fok == 0 {
log.Fatal("error in fragment shader")
}
var linkOk int32
program := gl.CreateProgram()
gl.AttachShader(program, vs)
gl.AttachShader(program, fs)
gl.LinkProgram(program)
gl.GetProgramiv(program, gl.LINK_STATUS, &linkOk)
if linkOk == 0 {
log.Fatal("gl.LinkProgram")
}
attribName := fixupSrc("coord2d")
attribCoord2d := gl.GetAttribLocation(program, gl.Str(attribName))
if attribCoord2d == -1 {
log.Fatal("failed to bind attribute")
}
return program, attribCoord2d
}
func (c *Context) NewProgram(shaders []Shader) (Program, error) {
var program Program
if err := c.runOnContextThread(func() error {
p := gl.CreateProgram()
if p == 0 {
return errors.New("opengl: glCreateProgram failed")
}
for _, shader := range shaders {
gl.AttachShader(p, uint32(shader))
}
gl.LinkProgram(p)
var v int32
gl.GetProgramiv(p, gl.LINK_STATUS, &v)
if v == gl.FALSE {
return errors.New("opengl: program error")
}
program = Program(p)
return nil
}); err != nil {
return 0, err
}
return program, nil
}
// GetProgrami returns a parameter value for a program.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetProgramiv.xhtml
func GetProgrami(p Program, pname Enum) int {
var result int32
gl.GetProgramiv(p.Value, uint32(pname), &result)
return int(result)
}
