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 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 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 (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
}
func (s *Shader) addProgram(text string, typ uint32) error {
shader := gl.CreateShader(typ)
if shader == 0 {
return errors.New("could not find valid memory location when adding shader")
}
cStr := gl.Str(text + "\000")
gl.ShaderSource(shader, 1, &cStr, nil)
gl.CompileShader(shader)
var result int32
gl.GetShaderiv(shader, gl.COMPILE_STATUS, &result)
if result == 0 {
return s.getShaderInfoLog(shader, "get shader error")
}
gl.AttachShader(s.program, shader)
return nil
}
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
}
// AttachShader attaches a shader to a program.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glAttachShader.xhtml
func AttachShader(p Program, s Shader) {
gl.AttachShader(p.Value, s.Value)
}
func (c *Context) AttachShader(program *Program, shader *Shader) {
gl.AttachShader(program.uint32, shader.uint32)
}
func (*backend) AttachShader(p *gg.Program, s *gg.Shader) {
gl.AttachShader(p.Value.(uint32), s.Value.(uint32))
}