func loadTexture(fileName string) (uint32, error) {
imgFile, err := os.Open("./res/textures/" + fileName)
if err != nil {
return 0, err
}
imgCfg, _, err := image.DecodeConfig(imgFile)
if err != nil {
return 0, err
}
_, err = imgFile.Seek(0, 0)
if err != nil {
return 0, err
}
w, h := int32(imgCfg.Width), int32(imgCfg.Height)
img, _, err := image.Decode(imgFile)
if err != nil {
return 0, err
}
buffer := make([]byte, w*h*4)
index := 0
for y := 0; y < int(h); y++ {
for x := 0; x < int(w); x++ {
pixel := img.At(x, y).(color.NRGBA)
buffer[index] = pixel.R
buffer[index+1] = pixel.G
buffer[index+2] = pixel.B
buffer[index+3] = pixel.A
index += 4
}
}
var texture uint32
gl.GenTextures(1, &texture)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA8,
w,
h,
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(buffer))
return texture, nil
}
// Shouldn't have tabs nor newlines
func (o *OpenGlStream) PrintSegment(s string) {
if s == "" {
return
}
if o.BackgroundColor != nil && o.BorderColor == nil {
gl.PushAttrib(gl.CURRENT_BIT)
gl.Color3dv((*float64)(&o.BackgroundColor[0]))
gl.PushMatrix()
gl.Translated(float64(o.pos[0]), float64(o.pos[1]), 0)
for range s {
gl.CallList(oFontBackground)
}
gl.PopMatrix()
gl.PopAttrib()
}
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_LOD_BIAS, float32(lodBias*0.01))
gl.Enable(gl.BLEND)
defer gl.Disable(gl.BLEND)
gl.Enable(gl.TEXTURE_2D)
defer gl.Disable(gl.TEXTURE_2D)
gl.PushMatrix()
gl.Translated(float64(o.pos[0]), float64(o.pos[1]), 0)
gl.ListBase(oFontBase + uint32(o.FontOptions)*96)
gl.CallLists(int32(len(s)), gl.UNSIGNED_BYTE, gl.Ptr(&[]byte(s)[0]))
gl.PopMatrix()
//CheckGLError()
}
func (texture *Texture) SetMipmapSharpness(sharpness float32) {
var maxMipmapSharpness float32
gl.GetFloatv(gl.MAX_TEXTURE_LOD_BIAS, &maxMipmapSharpness)
mipmapSharpness := math.Min(math.Max(float64(sharpness), -float64(maxMipmapSharpness+0.01)), float64(maxMipmapSharpness-0.01))
bindTexture(texture.getHandle())
//negative bias is sharper
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_LOD_BIAS, -float32(mipmapSharpness))
}
func LoadTexture(path string) {
//fmt.Printf("Trying to load texture %q: ", path)
// Open the file
file, err := os.Open(path)
if err != nil {
fmt.Println(os.Getwd())
log.Fatal(err)
}
defer file.Close()
// Decode the image
img, _, err := image.Decode(file)
if err != nil {
log.Fatal(err)
}
bounds := img.Bounds()
//fmt.Printf("Loaded %vx%v texture.\n", bounds.Dx(), bounds.Dy())
var format int
var pixPointer *uint8
switch img := img.(type) {
case *image.RGBA:
format = gl.RGBA
pixPointer = &img.Pix[0]
case *image.NRGBA:
format = gl.RGBA
pixPointer = &img.Pix[0]
case *image.Gray:
format = gl.ALPHA
pixPointer = &img.Pix[0]
default:
log.Fatalf("LoadTexture: Unsupported type %T.\n", img)
}
var texture uint32
gl.GenTextures(1, &texture)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.GENERATE_MIPMAP, gl.TRUE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_LOD_BIAS, -0.5)
gl.TexImage2D(gl.TEXTURE_2D, 0, int32(format), int32(bounds.Dx()), int32(bounds.Dy()), 0, uint32(format), gl.UNSIGNED_BYTE, gl.Ptr(pixPointer))
CheckGLError()
}
// TexParameterf sets a float texture parameter.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glTexParameter.xhtml
func TexParameterf(target, pname Enum, param float32) {
gl.TexParameterf(uint32(target), uint32(pname), param)
}