func MakeTextureFromImageFile(filePath string) gl.Uint {
var file, err = os.Open(filePath)
var img image.Image
var tex gl.Uint
if err != nil {
panic(err)
}
defer file.Close()
img, _, err = image.Decode(file)
if err != nil {
panic(err)
}
w, h := img.Bounds().Dx(), img.Bounds().Dy()
sw, sh := gl.Sizei(w), gl.Sizei(h)
rgba := image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
rgba.Set(x, y, img.At(x, h-1-y))
}
}
gl.GenTextures(1, &tex)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexStorage2D(gl.TEXTURE_2D, 1, gl.RGBA8, sw, sh)
gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, sw, sh, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))
gl.BindTexture(gl.TEXTURE_2D, 0)
PanicIfErrors("MakeTextureFromImageFile(%v)", filePath)
return tex
}
func reinitScreen(width, height int) {
winWidth, winHeight = gl.Sizei(width), gl.Sizei(height)
if sdlScreen != nil {
sdlScreen.Free()
}
sdlScreen = sdl.SetVideoMode(width, height, 24, sdl.OPENGL|sdl.RESIZABLE)
if sdlScreen == nil {
panic("SDL video init error")
}
}
func resize(w, h int) {
// TODO: Fix the near and far limits
persMat := gls.Perspective(45, float32(w)/float32(h), 1, 1000)
//persMat := gls.Identity()
gl.UseProgram(theProgram)
gls.UniformMatrix4fv(ctcm_unif, 1, false, persMat)
//log.Println("Resizing ", persMat)
gl.Viewport(0, 0, gl.Sizei(w), gl.Sizei(h))
}
func ShaderSource(name string, shader gl.Uint, source string, defines map[string]interface{}, logPrint bool) {
var src []*gl.Char
var i, l = 1, len(defines)
var lines = make([]string, (l*5)+3)
var joined string
lines[0] = "#version 420 core\n"
for dk, dv := range defines {
lines[i+0] = "#define "
lines[i+1] = dk
lines[i+2] = " "
lines[i+3] = fmt.Sprintf("%v", dv)
lines[i+4] = "\n"
i = i + 5
}
lines[i] = "#line 1\n"
lines[i+1] = source
joined = strings.Join(lines, "")
src = gl.GLStringArray(lines...)
defer gl.GLStringArrayFree(src)
gl.ShaderSource(shader, gl.Sizei(len(src)), &src[0], nil)
PanicIfErrors("ShaderSource(name=%v source=%v)", name, joined)
if logPrint {
log.Printf("\n\n------------------------------\n%s\n\n", joined)
}
}
func glFillTextureFromImageFile(filePath string) {
var file, err = os.Open(filePath)
var img image.Image
if err != nil {
panic(err)
}
defer file.Close()
if img, _, err = image.Decode(file); err != nil {
panic(err)
}
w, h := img.Bounds().Dx(), img.Bounds().Dy()
rgba := image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
rgba.Set(x, y, img.At(x, y))
}
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.Sizei(w), gl.Sizei(h), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))
}
func CreateProgram(shaders []g.Uint) g.Uint {
p := g.CreateProgram()
for _, v := range shaders {
g.AttachShader(p, v)
}
g.LinkProgram(p)
var status g.Int
g.GetProgramiv(p, g.LINK_STATUS, &status)
if status == g.FALSE {
var length g.Int
g.GetProgramiv(p, g.INFO_LOG_LENGTH, &length)
log.Println(length)
logStr := g.GLStringAlloc(g.Sizei(length + 1))
g.GetProgramInfoLog(p, g.Sizei(length), nil, logStr)
log.Println(g.GoString(logStr))
}
return p
}
func glGetInfoLog(shaderOrProgram gl.Uint, isShader bool) string {
var l = gl.Sizei(256)
var s = gl.GLStringAlloc(l)
defer gl.GLStringFree(s)
if isShader {
gl.GetShaderInfoLog(shaderOrProgram, l, nil, s)
} else {
gl.GetProgramInfoLog(shaderOrProgram, l, nil, s)
}
return gl.GoString(s)
}
func MakeTextureFromImageFloatsFile(filePath string, w, h int) gl.Uint {
var file, err = os.Open(filePath)
var tex gl.Uint
var pix = make([]gl.Float, w*h*3)
var fVal float32
var raw []uint8
var buf *bytes.Buffer
var i int
if err != nil {
panic(err)
}
defer file.Close()
raw, err = ioutil.ReadAll(file)
if err != nil {
panic(err)
}
buf = bytes.NewBuffer(raw)
for i = 0; (err == nil) && (i < len(pix)); i++ {
if err = binary.Read(buf, binary.LittleEndian, &fVal); err == io.EOF {
err = nil
break
} else if err == nil {
pix[i] = gl.Float(fVal)
}
}
if err != nil {
panic(err)
}
sw, sh := gl.Sizei(w), gl.Sizei(h)
gl.GenTextures(1, &tex)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexStorage2D(gl.TEXTURE_2D, 1, gl.RGB16F, sw, sh)
gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, sw, sh, gl.RGB, gl.FLOAT, gl.Pointer(&pix[0]))
gl.BindTexture(gl.TEXTURE_2D, 0)
PanicIfErrors("MakeTextureFromImageFloatsFile(%v)", filePath)
return tex
}
func ShaderInfoLog(shaderOrProgram gl.Uint, isShader bool) string {
var l = gl.Sizei(256)
var s = gl.GLStringAlloc(l)
defer gl.GLStringFree(s)
if isShader {
gl.GetShaderInfoLog(shaderOrProgram, l, nil, s)
} else {
gl.GetProgramInfoLog(shaderOrProgram, l, nil, s)
}
PanicIfErrors("ShaderInfoLog(s=%v)", isShader)
return gl.GoString(s)
}
// Loads a shader from a string
func LoadShader(typ g.Enum, s string) g.Uint {
shader := g.CreateShader(typ)
cst := g.GLString(s)
defer g.GLStringFree(cst)
g.ShaderSource(shader, 1, &cst, nil)
g.CompileShader(shader)
var status g.Int
g.GetShaderiv(shader, g.COMPILE_STATUS, &status)
if status == g.FALSE {
var length g.Int
g.GetShaderiv(shader, g.INFO_LOG_LENGTH, &length)
log.Println(int(length))
logStr := g.GLStringAlloc(g.Sizei(length + 1))
// TODO: defer
g.GetShaderInfoLog(shader, g.Sizei(length), nil, logStr)
log.Println(g.GoString(logStr))
}
return shader
}
func handleResize(w, h int) {
gl.Viewport(0, 0, gl.Sizei(w), gl.Sizei(h))
}
func ReadAtomicCounterValues(ac gl.Uint, vals []gl.Uint) {
var ptr *gl.Uint
gl.BindBuffer(gl.ATOMIC_COUNTER_BUFFER, ac)
for i := 0; i < len(vals); i++ {
ptr = (*gl.Uint)(gl.MapBufferRange(gl.ATOMIC_COUNTER_BUFFER, gltypes.OffsetIntPtr(nil, gl.Sizei(i*4)), gltypes.SizeOfGlUint, gl.MAP_READ_BIT))
vals[i] = *ptr
gl.UnmapBuffer(gl.ATOMIC_COUNTER_BUFFER)
}
gl.BindBuffer(gl.ATOMIC_COUNTER_BUFFER, 0)
PanicIfErrors("ReadAtomicCounter(%v)", ac)
}
func display() {
gl.ClearColor(0.19, 0.19, 0.21, 0)
gl.ClearDepth(1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(theProgram)
// Temporarily set the cam t clip
id := gls.Identity()
trans := getLookAtMatrix()
// log.Println(trans)
gls.UniformMatrix4fv(wtcm_unif, 1, false, trans)
gls.UniformMatrix4fv(mtwm_unif, 1, false, id)
// And here we do the actual rendering
// Generate a name for vufferobj and store it
gl.GenBuffers(1, &positionBufferObject)
// Bind it to a target
gl.BindBuffer(gl.ARRAY_BUFFER, positionBufferObject)
// Conver all nodes to a long array of vertexes!
i := 0
// TODO: Fix this, based on 4 per eleemnts
vpos := make([]float32, len(elements)*4*4)
elms := make(map[uint32]mS, len(elements))
// Note that the order here is undefined!
ii := 0
for k, v := range elements {
elms[k] = mS{ii, len(v.Nodes())}
for _, vv := range v.Nodes() {
ii++
vpos[i] = float32(nodes[vv][0])
i++
vpos[i] = float32(nodes[vv][1])
i++
vpos[i] = float32(nodes[vv][2])
i++
vpos[i] = 1.0
i++
}
}
/*
for _, v := range nodes {
vpos[i] = float32(v[0])
i++
vpos[i] = float32(v[1])
i++
vpos[i] = float32(v[2])
i++
}
*/
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(32/8*len(vpos)), (gl.Pointer)(&vpos[0]), gl.STATIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, positionBufferObject)
gl.EnableVertexAttribArray(0)
gl.VertexAttribPointer(0, 4, gl.FLOAT, gl.FALSE, 0, (gl.Pointer)(nil))
/* for _,v := range elms {
}
*/
for _, v := range elms {
gl.DrawArrays(gl.LINE_LOOP, gl.Int(v.Start), gl.Sizei(v.Length))
}
// Draw Coordinate acis
/*for i := 9; i < 9+2*5; i += 2 {
gl.DrawArrays(gl.LINE_STRIP, gl.Int(i), 2)
}*/
}
func (v *Vec2) Sizei() (sizeof gl.Sizei) {
sizeof = gl.Sizei(unsafe.Sizeof(*v))
return sizeof
}
func glSetShaderSource(shader gl.Uint, source string) {
var src = gl.GLStringArray(source)
defer gl.GLStringArrayFree(src)
gl.ShaderSource(shader, gl.Sizei(len(src)), &src[0], nil)
}
func (mf *Mat4f) Sizei() (sizeof gl.Sizei) {
sizeof = gl.Sizei(unsafe.Sizeof(*mf))
return sizeof
}
func (vf *Vec2f) Sizei() (sizeof gl.Sizei) {
sizeof = gl.Sizei(unsafe.Sizeof(*vf))
return sizeof
}
func (m *Mat4) Sizei() (sizeof gl.Sizei) {
sizeof = gl.Sizei(unsafe.Sizeof(*m))
return sizeof
}