func DetachShader(
program uint32, shader uint32) {
C.glDetachShader(
C.GLuint(program),
C.GLuint(shader))
}
// Link links the attached shader objects
func (p *Program) Link() error {
var val, val2 C.GLint
C.glLinkProgram(p.i)
C.glGetProgramiv(p.i, LINK_STATUS, &val)
if val != TRUE {
C.glGetProgramiv(p.i, INFO_LOG_LENGTH, &val)
buf := make([]C.GLchar, val+1)
C.glGetProgramInfoLog(p.i, C.GLsizei(val), nil, &buf[0])
return errors.New(C.GoString((*C.char)(&buf[0])))
}
p.attr = make(map[string]C.GLuint)
C.glGetProgramiv(p.i, ACTIVE_ATTRIBUTES, &val)
C.glGetProgramiv(p.i, ACTIVE_ATTRIBUTE_MAX_LENGTH, &val2)
buf := make([]C.char, val2)
for i := C.GLuint(0); i < C.GLuint(val); i++ {
C.glGetActiveAttrib(p.i, i, C.GLsizei(val2), nil, nil, nil, (*C.GLchar)(&buf[0]))
p.attr[C.GoString(&buf[0])] = C.GLuint(C.glGetAttribLocation(p.i, (*C.GLchar)(&buf[0])))
}
p.uni = make(map[string]C.GLint)
C.glGetProgramiv(p.i, ACTIVE_UNIFORMS, &val)
C.glGetProgramiv(p.i, ACTIVE_UNIFORM_MAX_LENGTH, &val2)
buf = make([]C.char, val2)
for i := C.GLuint(0); i < C.GLuint(val); i++ {
C.glGetActiveUniform(p.i, i, C.GLsizei(val2), nil, nil, nil, (*C.GLchar)(&buf[0]))
p.uni[C.GoString(&buf[0])] = C.glGetUniformLocation(p.i, (*C.GLchar)(&buf[0]))
}
return nil
}
func (program *Program) GetAttrib(name string) VertexAttrib {
cname := (*C.GLchar)(C.CString(name))
defer C.free(unsafe.Pointer(cname))
iloc := C.glGetAttribLocation(program.id, cname)
if iloc < 0 {
panic(fmt.Errorf("not an active uniform: %s", name))
}
loc := C.GLuint(iloc)
datatype := C.GLenum(0)
C.glGetActiveAttrib(program.id, C.GLuint(loc), 0, nil, nil, &datatype, nil)
switch datatype {
case C.GL_FLOAT:
return FloatAttrib{vattrib{loc}}
case C.GL_FLOAT_VEC2:
return Vec2Attrib{FloatAttrib{vattrib{loc}}}
case C.GL_FLOAT_VEC3:
return Vec3Attrib{FloatAttrib{vattrib{loc}}}
case C.GL_FLOAT_VEC4:
return Vec4Attrib{FloatAttrib{vattrib{loc}}}
default:
panic(fmt.Errorf("unsupported attribute type: %#x", datatype))
}
}
func (program Program) BindFragDataLocation(colorNumber int, name string) {
cname := glString(name)
defer freeString(cname)
C.glBindFragDataLocation(C.GLuint(program), C.GLuint(colorNumber), cname)
}
func (program *Program) GetAttrib(name string) VertexAttrib {
cname := (*C.GLchar)(C.CString(name))
defer C.free(unsafe.Pointer(cname))
iloc := C.glGetAttribLocation(program.id, cname)
if iloc < 0 {
panic(fmt.Errorf("not an active attribute: %s", name))
}
loc := C.GLuint(iloc)
datatype := C.GLenum(0)
length := C.GLsizei(0)
size := C.GLint(0)
aname := [32]byte{}
C.glGetActiveAttrib(program.id, C.GLuint(loc), C.GLsizei(len(aname)), &length, &size, &datatype, (*C.GLchar)(unsafe.Pointer(&aname[0])))
switch datatype {
case C.GL_FLOAT:
return FloatAttrib{vattrib{loc}}
case C.GL_FLOAT_VEC2:
return Vec2Attrib{FloatAttrib{vattrib{loc}}}
case C.GL_FLOAT_VEC3:
return Vec3Attrib{FloatAttrib{vattrib{loc}}}
case C.GL_FLOAT_VEC4:
return Vec4Attrib{FloatAttrib{vattrib{loc}}}
default:
panic(fmt.Errorf("unsupported attribute type: %#x", datatype))
}
}
func (program Program) GetAttachedShaders() []Object {
var len C.GLint
C.glGetProgramiv(C.GLuint(program), C.GLenum(ACTIVE_UNIFORM_MAX_LENGTH), &len)
objects := make([]Object, len)
C.glGetAttachedShaders(C.GLuint(program), C.GLsizei(len), nil, *((**C.GLuint)(unsafe.Pointer(&objects))))
return objects
}
func (program Program) BindAttribLocation(index AttribLocation, name string) {
cname := glString(name)
defer freeString(cname)
C.glBindAttribLocation(C.GLuint(program), C.GLuint(index), cname)
}
// void glSamplerParameteri(GLuint sampler,GLenum pname,GLint param)
func (sampler SamplerObject) Parameters(parameters *SamplerParameters) {
C.glSamplerParameteri(C.GLuint(sampler), C.GL_TEXTURE_WRAP_R, parameters.WrapR)
C.glSamplerParameteri(C.GLuint(sampler), C.GL_TEXTURE_WRAP_S, parameters.WrapS)
C.glSamplerParameteri(C.GLuint(sampler), C.GL_TEXTURE_WRAP_T, parameters.WrapT)
C.glSamplerParameteri(C.GLuint(sampler), C.GL_TEXTURE_MIN_FILTER, parameters.MinFilter)
C.glSamplerParameteri(C.GLuint(sampler), C.GL_TEXTURE_MAG_FILTER, parameters.MagFilter)
}
func BindAttribLocation(
program uint32, index uint32, name string) {
s := glString(name)
C.glBindAttribLocation(
C.GLuint(program),
C.GLuint(index),
s)
}
func GetActiveUniform(program, index uint, bufsize int) (size int32, type_ uint32, name string) {
cs := CString(name)
defer C.free(unsafe.Pointer(cs))
C.glGetActiveUniform(C.GLuint(program), C.GLuint(index),
C.GLsizei(bufsize), nil, (*C.GLint)(&size), (*C.GLenum)(&type_), cs)
name = GoString(cs)
return
}
func (program Program) GetActiveUniform(index UniformLocation) (string, GLenum, int) {
var written C.GLsizei
var size C.GLint
var tp C.GLenum
//Allocate a buffer of 64 characters to write variable names to
var buffer *C.GLchar = (*C.GLchar)(C.malloc(64))
defer freeString(buffer)
C.glGetActiveUniform(C.GLuint(program), C.GLuint(index), C.GLsizei(128), &written, &size, &tp, buffer)
return C.GoStringN((*C.char)(buffer), C.int(written)), GLenum(tp), int(size)
}
func (shader Shader) GetSource() string {
var len C.GLint
C.glGetShaderiv(C.GLuint(shader), C.GLenum(SHADER_SOURCE_LENGTH), &len)
log := C.malloc(C.size_t(len + 1))
C.glGetShaderSource(C.GLuint(shader), C.GLsizei(len), nil, (*C.GLchar)(log))
defer C.free(log)
return C.GoString((*C.char)(log))
}
func (shader Shader) GetInfoLog() string {
var length C.GLint
C.glGetShaderiv(C.GLuint(shader), C.GLenum(INFO_LOG_LENGTH), &length)
// length is buffer size including null character
if length > 1 {
log := C.malloc(C.size_t(length))
defer C.free(log)
C.glGetShaderInfoLog(C.GLuint(shader), C.GLsizei(length), nil, (*C.GLchar)(log))
return C.GoString((*C.char)(log))
}
return ""
}
func GetActiveUniform(
program uint32, index uint32, bufsize Sizei,
length *Sizei, size *int32, type_ *Enum, name *string) {
s := glString(*name)
C.glGetActiveUniform(
C.GLuint(program),
C.GLuint(index),
C.GLsizei(bufsize),
(*C.GLsizei)(length),
(*C.GLint)(size),
(*C.GLenum)(type_),
s)
name = goString(s)
}
func (shader Shader) Compile() {
C.glCompileShader(C.GLuint(shader))
status := C.GLint(0)
C.glGetShaderiv(C.GLuint(shader), C.GL_COMPILE_STATUS, &status)
if status != C.GL_TRUE {
loglen := C.GLint(0)
C.glGetShaderiv(C.GLuint(shader), C.GL_INFO_LOG_LENGTH, &loglen)
log := (*C.GLchar)(C.malloc(C.size_t(loglen)))
defer C.free(unsafe.Pointer(log))
C.glGetShaderInfoLog(C.GLuint(shader), C.GLsizei(loglen), nil, log)
panic(fmt.Errorf("Failed to compile %s: %s", shader.Type(), C.GoString((*C.char)(log))))
}
}
func GetShaderiv(
shader uint32, pname Enum, params *int32) {
C.glGetShaderiv(
C.GLuint(shader),
C.GLenum(pname),
(*C.GLint)(params))
}
func BindRenderbuffer(
target Enum, renderbuffer uint32) {
C.glBindRenderbuffer(
C.GLenum(target),
C.GLuint(renderbuffer))
}
func (program Program) GetFragDataLocation(name string) int {
cname := glString(name)
defer freeString(cname)
return int(C.glGetFragDataLocation(C.GLuint(program), cname))
}
// GetInfoLog returns the information log for a program object.
// This method makes two OpenGL calls: one to get the info log size, and one to get the info log.
func (p Program) GetInfoLog() string {
sz := p.Get(ProgramInfoLogLength)
cstr := (*C.char)(C.malloc(C.size_t(sz + 1)))
defer C.free(unsafe.Pointer(cstr))
C.glGetProgramInfoLog(C.GLuint(p), C.GLsizei(sz), nil, (*C.GLchar)(cstr))
return C.GoString(cstr)
}
// GetInfoLog returns the information log for a shader object.
// This method makes two OpenGL calls: one to get the info log size, and one to get the info log.
func (s Shader) GetInfoLog() string {
sz := s.Get(ShaderInfoLogLength)
cstr := (*C.char)(C.malloc(C.size_t(sz + 1)))
defer C.free(unsafe.Pointer(cstr))
C.glGetShaderInfoLog(C.GLuint(s), C.GLsizei(sz), nil, (*C.GLchar)(cstr))
return C.GoString(cstr)
}
// drawLoop is the primary drawing loop.
//
// After Cocoa has created an NSWindow and called prepareOpenGL,
// it starts drawLoop on a locked goroutine to handle OpenGL calls.
//
// The screen is drawn every time a paint.Event is received, which can be
// triggered either by the user or by Cocoa via drawgl (for example, when
// the window is resized).
func drawLoop(w *windowImpl, vba uintptr) {
runtime.LockOSThread()
C.makeCurrentContext(C.uintptr_t(w.ctx))
// Starting in OS X 10.11 (El Capitan), the vertex array is
// occasionally getting unbound when the context changes threads.
//
// Avoid this by binding it again.
C.glBindVertexArray(C.GLuint(vba))
if errno := C.glGetError(); errno != 0 {
panic(fmt.Sprintf("gldriver: glBindVertexArray failed: %d", errno))
}
workAvailable := w.worker.WorkAvailable()
// TODO(crawshaw): exit this goroutine on Release.
for {
select {
case <-workAvailable:
w.worker.DoWork()
case <-w.publish:
loop:
for {
select {
case <-workAvailable:
w.worker.DoWork()
default:
break loop
}
}
C.flushContext(C.uintptr_t(w.ctx))
w.publishDone <- screen.PublishResult{}
}
}
}
func StencilFunc(
func_ Enum, ref int32, mask uint32) {
C.glStencilFunc(
C.GLenum(func_),
C.GLint(ref),
C.GLuint(mask))
}
func GetVertexAttribiv(
index uint32, pname Enum, params *int32) {
C.glGetVertexAttribiv(
C.GLuint(index),
C.GLenum(pname),
(*C.GLint)(params))
}
func BindTexture(
target Enum, texture uint32) {
C.glBindTexture(
C.GLenum(target),
C.GLuint(texture))
}
func GetUniformiv(
program uint32, location int32, params *int32) {
C.glGetUniformiv(
C.GLuint(program),
C.GLint(location),
(*C.GLint)(params))
}
func StencilFuncSeparate(face, fn Enum, ref int, mask uint32) {
defer func() {
errstr := errDrain()
log.Printf("gl.StencilFuncSeparate(%v, %v, %v, %v) %v", face, fn, ref, mask, errstr)
}()
C.glStencilFuncSeparate(face.c(), fn.c(), C.GLint(ref), C.GLuint(mask))
}
func GetVertexAttribPointerv(
index uint32, pname Enum, pointer *Void) {
C.glGetVertexAttribPointerv(
C.GLuint(index),
C.GLenum(pname),
(*unsafe.Pointer)(*pointer))
}
func StencilMask(mask uint32) {
defer func() {
errstr := errDrain()
log.Printf("gl.StencilMask(%v) %v", mask, errstr)
}()
C.glStencilMask(C.GLuint(mask))
}
func VertexAttrib2f(
indx uint32, x float32, y float32) {
C.glVertexAttrib2f(
C.GLuint(indx),
C.GLfloat(x),
C.GLfloat(y))
}
func StencilMaskSeparate(face Enum, mask uint32) {
defer func() {
errstr := errDrain()
log.Printf("gl.StencilMaskSeparate(%v, %v) %v", face, mask, errstr)
}()
C.glStencilMaskSeparate(face.c(), C.GLuint(mask))
}