func OpenWindow(width, height int, caption string) *glfw.Window {
// OpenGL haluaa että sitä käytetään aina samasta threadista
// muuten tulee satunnaisia segfaultteja
runtime.LockOSThread()
glfw.Init()
// luodaan ikkuna
w, err := glfw.CreateWindow(width, height, caption, nil, nil)
if err != nil {
log.Fatal(err)
}
w.MakeContextCurrent()
gl.Init()
// Jotta painalluksista kerrottaisiin vaikka ne olisivat jo päättyneet
w.SetInputMode(glfw.StickyKeys, glfw.True)
w.SetInputMode(glfw.StickyMouseButtons, glfw.True)
// läpinäkyvyys päälle (non-premultiplied alpha)
gl.Enable(gl.BLEND)
gl.BlendEquationSeparate(gl.FUNC_ADD, gl.FUNC_ADD)
gl.BlendFuncSeparate(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ZERO)
return w
}
func (ps *ParticleSystem) DoStep(gs *gamestate.GameState) {
ps.TransformProg.Use()
ps.VaoTff1.Bind()
gl.Enable(gl.RASTERIZER_DISCARD)
defer gl.Disable(gl.RASTERIZER_DISCARD)
// ps.Data1.Bind(gl.ARRAY_BUFFER)
// SetAttribPointers(&ps.TransformLoc, &ParticleVertex{}, false)
//var orientation mgl.Quat = gs.Player.Camera.Orientation
var model mgl.Mat4 = gs.Camera.Model()
pPos := model.Mul4x1(mgl.Vec4{1, -1, 0, 1})
ps.TransformLoc.Origin.Uniform3f(pPos[0], pPos[1], pPos[2])
dir := model.Mul4x1(mgl.Vec4{0, 0, 100, 0})
ps.TransformLoc.Dir.Uniform3f(dir[0], dir[1], dir[2])
ps.Data2.BindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0)
gl.BeginTransformFeedback(gl.POINTS)
gl.DrawArrays(gl.POINTS, 0, ps.NumParticles)
gl.EndTransformFeedback()
ps.Data1, ps.Data2 = ps.Data2, ps.Data1
ps.VaoRender1, ps.VaoRender2 = ps.VaoRender2, ps.VaoRender1
ps.VaoTff1, ps.VaoTff2 = ps.VaoTff2, ps.VaoTff1
}
func NewGameState(window *sdl.Window, world *World) (gamestate *GameState) {
gl.ClearColor(0., 0., 0.4, 0.0)
gl.Enable(gl.DEPTH_TEST)
bar := tw.NewBar("TweakBar")
gamestate = &GameState{
Window: window,
Camera: nil,
Bar: bar,
World: world,
Fps: 0,
Options: settings.BoolOptions{},
}
opt := &gamestate.Options
opt.Load()
gamestate.Camera = gamestate.World.Player.GetCamera()
tw.Define(" GLOBAL help='This example shows how to integrate AntTweakBar with SDL2 and OpenGL.' ")
bar.AddVarRO("fps", tw.TYPE_FLOAT, unsafe.Pointer(&gamestate.Fps), "")
opt.CreateGui(bar)
for i, portal := range gamestate.World.KdTree {
ptr := &(portal.(*Portal).Orientation)
bar.AddVarRW(fmt.Sprintf("Rotation %d", i), tw.TYPE_QUAT4F, unsafe.Pointer(ptr), "")
}
//window.GetSize(w, h)
w, h := window.GetSize()
tw.WindowSize(w, h)
return
}
func (v *Video) initGL() {
if gl.Init() != 0 {
panic(sdl.GetError())
}
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
v.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
posAttrib := v.prog.GetAttribLocation("vPosition")
texCoordAttr := v.prog.GetAttribLocation("vTexCoord")
v.textureUni = v.prog.GetAttribLocation("texture")
v.texture = gl.GenTexture()
gl.ActiveTexture(gl.TEXTURE0)
v.texture.Bind(gl.TEXTURE_2D)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
v.prog.Use()
posAttrib.EnableArray()
texCoordAttr.EnableArray()
vertVBO := gl.GenBuffer()
vertVBO.Bind(gl.ARRAY_BUFFER)
verts := []float32{-1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(verts)*int(unsafe.Sizeof(verts[0])), &verts[0], gl.STATIC_DRAW)
textCoorBuf := gl.GenBuffer()
textCoorBuf.Bind(gl.ARRAY_BUFFER)
texVerts := []float32{0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(texVerts)*int(unsafe.Sizeof(texVerts[0])), &texVerts[0], gl.STATIC_DRAW)
posAttrib.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
texCoordAttr.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
}
func initGL() (err error) {
gl.Init()
gl.ShadeModel(gl.SMOOTH)
gl.ClearColor(0, 0, 0, 0)
gl.ClearDepth(1)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
gl.DepthFunc(gl.NEVER)
gl.Enable(gl.BLEND)
gl.DepthMask(true)
//loadShader()
return
}
func (this *WorldRenderer) render(ww *gamestate.World, options *settings.BoolOptions, viewport Viewport, recursion int, srcPortal *gamestate.Portal) {
this.Framebuffer[recursion].Bind()
defer this.Framebuffer[recursion].Unbind()
gl.Clear(gl.DEPTH_BUFFER_BIT)
camera := gamestate.NewCameraFromMat4(this.View)
Rot2D := camera.Rotation2D()
gl.CullFace(gl.BACK)
time := float64(sdl.GetTicks()) / 1000
if options.Wireframe {
gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)
} else {
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
}
if options.Skybox {
gl.Disable(gl.DEPTH_TEST)
this.SkyboxRenderer.Render(this.Skybox, this.Proj, this.View, this.ClippingPlane_ws, nil)
gl.Enable(gl.DEPTH_TEST)
}
gl.Enable(gl.CULL_FACE)
if recursion != 0 {
gl.Enable(gl.CLIP_DISTANCE0)
defer gl.Disable(gl.CLIP_DISTANCE0)
}
for _, entity := range ww.ExampleObjects {
this.MeshRenderer.Render(entity, this.Proj, this.View, this.ClippingPlane_ws, nil)
}
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Disable(gl.CULL_FACE)
if options.WorldRender {
this.HeightMapRenderer.Render(ww.HeightMap, this.Proj, this.View, this.ClippingPlane_ws, nil)
}
PlayerPos := ww.Player.Position()
ww.Water.Height = PlayerPos[2] - 15
if options.WaterRender {
this.WaterRendererA.Render(ww.Water, this.Proj, this.View, this.ClippingPlane_ws, WaterRenderUniforms{time, PlayerPos})
}
if options.WaterNormals {
this.WaterRendererB.Render(ww.Water, this.Proj, this.View, this.ClippingPlane_ws, WaterRenderUniforms{time, PlayerPos})
}
gl.Disable(gl.CULL_FACE)
gl.Disable(gl.BLEND)
if options.TreeRender {
this.TreeRenderer.Render(ww.Trees, this.Proj, this.View, this.ClippingPlane_ws, Rot2D)
}
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE)
if options.ParticleRender {
this.ParticleSystem.Render(this.Proj, this.View, this.ClippingPlane_ws)
}
gl.Disable(gl.BLEND)
boxVertices := (*gamestate.TriangleMesh)(gamestate.QuadMesh()).MakeBoxVertices()
pv := this.Proj.Mul4(this.View)
// calculating nearest portal
pos4f := this.View.Inv().Mul4x1(mgl.Vec4{0, 0, 0, 1})
nearestPortal := ww.NearestPortal(pos4f)
// draw all portals except the nearest and the portal that we are looking throug
for _, portal := range ww.Portals {
// do not draw the nearest portal or the portal behind the source portal if available
if (nearestPortal != portal) && (srcPortal == nil || srcPortal.Target != portal) {
gl.Enable(gl.DEPTH_CLAMP)
additionalUniforms := map[string]int{"Image": 7}
this.PortalRenderer.Render(portal, this.Proj, this.View, this.ClippingPlane_ws, additionalUniforms)
}
}
gl.Disable(gl.BLEND)
gl.Disable(gl.CULL_FACE)
if options.DebugLines {
if options.DepthTestDebugLines {
gl.Disable(gl.DEPTH_TEST)
}
this.DebugRenderer.Render(this.Proj, this.View)
gl.Enable(gl.DEPTH_TEST)
}
// draw
if recursion < this.MaxRecursion {
portal := nearestPortal
pos := portal.Position
rotation := portal.Orientation.Mat4()
Model := mgl.Translate3D(pos[0], pos[1], pos[2]).Mul4(rotation)
pvm := pv.Mul4(Model)
meshMin := mgl.Vec4{math.MaxFloat32, math.MaxFloat32, math.MaxFloat32, math.MaxFloat32}
meshMax := mgl.Vec4{-math.MaxFloat32, -math.MaxFloat32, -math.MaxFloat32, -math.MaxFloat32}
for _, v := range boxVertices {
v = pvm.Mul4x1(v)
v = v.Mul(1 / v[3])
meshMin = gamestate.Min(meshMin, v)
meshMax = gamestate.Max(meshMax, v)
}
// at least partially visible
if -1 < meshMax[0] && meshMin[0] < 1 &&
-1 < meshMax[1] && meshMin[1] < 1 &&
-1 < meshMax[2] && meshMin[2] < 1 {
p1x, p1y := viewport.ToPixel(meshMin.Vec2())
p2x, p2y := viewport.ToPixel(meshMax.Vec2())
pw, ph := p2x-p1x, p2y-p1y
// do scissoring only when all vertices are in front of the camera
scissor := meshMax[2] < 1
scissor = scissor && (p1x != 0 || p1y != 0 || pw != viewport.W-1 || ph != viewport.H-1)
if scissor {
gl.Enable(gl.SCISSOR_TEST)
gl.Scissor(p1x, p1y, pw, ph)
}
// omit rendering when portal is not in frustum at all
// calculation View matrix that shows the target portal from the same angle as view shows the source portal
//pos2 := portal.Target.Position
Model2 := portal.Target.Model()
// model matrix, so that portal 1 in camera 1 looks identical to portal 2 in camera
oldView := this.View
this.View = this.View.Mul4(Model).Mul4(Model2.Inv())
normal_os := portal.Target.Normal
normal_ws := Model.Mul4x1(normal_os)
view_dir := helpers.HomogenDiff(portal.Position, camera.Position)
sign := view_dir.Dot(normal_ws)
oldClippingPlane := this.ClippingPlane_ws
this.ClippingPlane_ws = portal.Target.ClippingPlane(sign > 0)
this.render(ww, options, viewport, recursion+1, nearestPortal)
this.ClippingPlane_ws = oldClippingPlane
this.View = oldView
gl.ActiveTexture(gl.TEXTURE0)
this.Framebuffer[recursion+1].RenderTexture.Bind(gl.TEXTURE_RECTANGLE)
if scissor {
//gl.Scissor(0, 0, w, h)
gl.Disable(gl.SCISSOR_TEST)
}
this.Framebuffer[recursion].Bind()
gl.Enable(gl.DEPTH_CLAMP)
additionalUniforms := map[string]int{"Image": 0}
this.PortalRenderer.Render(nearestPortal, this.Proj, this.View, this.ClippingPlane_ws, additionalUniforms)
}
}
}
func main() {
glfw.SetErrorCallback(errorCallback)
// lock glfw/gl calls to a single thread
runtime.LockOSThread()
runtime.GOMAXPROCS(8) // Render, read commands, send input, extra for file loading, etc
if !glfw.Init() {
panic("Could not init glfw!")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
window, err := glfw.CreateWindow(800, 600, "Example", nil, nil)
if err != nil {
panic(err)
}
window.SetFramebufferSizeCallback(func(w *glfw.Window, width, height int) {
fmt.Printf("Framebuffer size is now %vx%v\n", width, height)
// Keep aspect ratio from camwidth/camheight
camRatio := camWidth / camHeight
bufRatio := float32(width) / float32(height)
var newWidth, newHeight float32
switch {
case camRatio > bufRatio:
newHeight = float32(width) / camRatio
newWidth = float32(width)
case bufRatio > camRatio:
newWidth = float32(height) * camRatio
newHeight = float32(height)
}
fmt.Printf("Viewport size is now %vx%v; cam ratio is %v; viewport ratio is %v;\n", newWidth, newHeight, camRatio, newWidth/newHeight)
gl.Viewport((width-int(newWidth))/2, (height-int(newHeight))/2, int(newWidth), int(newHeight))
})
defer window.Destroy()
window.MakeContextCurrent()
glfw.SwapInterval(1)
gl.Init()
// Enable blending
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
vao := gl.GenVertexArray()
vao.Bind()
vbo := gl.GenBuffer()
vbo.Bind(gl.ARRAY_BUFFER)
verticies := []float32{-0.5, 0.5,
0.5, 0.5,
0.5, -0.5,
-0.5, -0.5}
gl.BufferData(gl.ARRAY_BUFFER, len(verticies)*4, verticies, gl.STATIC_DRAW)
vertex_shader := gl.CreateShader(gl.VERTEX_SHADER)
vertex_shader.Source(vertex)
vertex_shader.Compile()
fmt.Println(vertex_shader.GetInfoLog())
defer vertex_shader.Delete()
fragment_shader := gl.CreateShader(gl.FRAGMENT_SHADER)
fragment_shader.Source(fragment)
fragment_shader.Compile()
fmt.Println(fragment_shader.GetInfoLog())
defer fragment_shader.Delete()
program := gl.CreateProgram()
program.AttachShader(vertex_shader)
program.AttachShader(fragment_shader)
program.BindFragDataLocation(0, "outColor")
program.Link()
program.Use()
defer program.Delete()
positionAttrib := program.GetAttribLocation("position")
positionAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
positionAttrib.EnableArray()
defer positionAttrib.DisableArray()
modelMat := program.GetUniformLocation("modelView")
projMat := program.GetUniformLocation("projection")
spriteSize := program.GetUniformLocation("size")
cmd := exec.Command(os.Args[1], os.Args[2:]...)
stdoutReader, stdoutWriter := io.Pipe()
cmd.Stdout = stdoutWriter
input := bufio.NewReader(stdoutReader)
stdinReader, stdinWriter := io.Pipe()
cmd.Stdin = stdinReader
stderr, err := cmd.StderrPipe()
chkErr(err)
go io.Copy(os.Stderr, stderr)
err = cmd.Start()
chkErr(err)
window.SetKeyCallback(handleKey)
go func() {
runtime.LockOSThread()
for !window.ShouldClose() {
sendInput(stdinWriter)
//fmt.Fprintf(stdinWriter, "T %v\n", time.Now())
<-ticks
readCommands(input)
}
}()
frameCnt := 0
queueDepth := 0
then := time.Now()
for !window.ShouldClose() {
frameCnt++
queueDepth += len(commandBus)
if frameCnt%120 == 0 {
fmt.Printf("Queue depth: %v. Render time: %v. Decode time: %v.\n", queueDepth/120, time.Since(then)/120, decodeTime/time.Duration(decodes))
queueDepth = 0
then = time.Now()
decodeTime = time.Duration(0)
decodes = 0
}
for len(commandBus) > 0 {
(<-commandBus)()
}
halfwidth := camWidth / 2.0
halfheight := camHeight / 2.0
projection := mathgl.Ortho2D(camera.x-halfwidth, camera.x+halfwidth, camera.y+halfheight, camera.y-halfheight)
projection = mathgl.Scale3D(camera.sx, camera.sy, 1).Mul4(projection)
projection = mathgl.HomogRotate3DZ(camera.rot).Mul4(projection)
projMat.UniformMatrix4f(false, (*[16]float32)(&projection))
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
for _, sprite := range sprites {
sMat := mathgl.Scale3D(sprite.sx, sprite.sy, 1)
sMat = mathgl.HomogRotate3DZ(sprite.rot).Mul4(sMat)
sMat = mathgl.Translate3D(sprite.x, sprite.y, sprite.z).Mul4(sMat)
// temp hack bank in
sprite.bank = 1
sMap := findSMap(sprite.smap)
spriteSize.Uniform2f(float32(sMap.getWidth()*sprite.cellwidth), float32(sMap.getHeight()*sprite.cellheight))
modelMat.UniformMatrix4f(false, (*[16]float32)(&sMat))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
}
window.SwapBuffers()
glfw.PollEvents()
if window.GetKey(glfw.KeyEscape) == glfw.Press {
window.SetShouldClose(true)
}
}
}
func NewTextures(heightMap *gamestate.HeightMap) *Textures {
textures := make([]gl.Texture, 10)
gl.GenTextures(textures)
gl.ActiveTexture(gl.TEXTURE0 + constants.TextureGround)
textures[1].Bind(gl.TEXTURE_2D)
helpers.LoadTexture2DWatched("textures/GravelCobbleS.jpg")
gl.GenerateMipmap(gl.TEXTURE_2D)
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.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.ActiveTexture(gl.TEXTURE0 + constants.TextureCliffs)
textures[2].Bind(gl.TEXTURE_2D)
helpers.LoadTexture2DWatched("textures/Cliffs0149_18_S.png")
gl.GenerateMipmap(gl.TEXTURE_2D)
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.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.ActiveTexture(gl.TEXTURE0 + constants.TextureColorBand)
textures[3].Bind(gl.TEXTURE_1D)
helpers.LoadTexture1DWatched("textures/gradient.png")
gl.TexParameteri(gl.TEXTURE_1D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_1D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.ActiveTexture(gl.TEXTURE0 + constants.TextureHeightMap)
textures[4].Bind(gl.TEXTURE_2D)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.R16, heightMap.W, heightMap.H, 0, gl.RED, gl.FLOAT, heightMap.TexturePixels())
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_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.ActiveTexture(gl.TEXTURE0 + constants.TextureTree)
textures[5].Bind(gl.TEXTURE_2D)
helpers.LoadTexture2DWatched("textures/palme.png")
gl.GenerateMipmap(gl.TEXTURE_2D)
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.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.ActiveTexture(gl.TEXTURE0 + constants.TextureFireBall)
textures[6].Bind(gl.TEXTURE_2D)
helpers.LoadTexture2DWatched("textures/fireball.png")
gl.GenerateMipmap(gl.TEXTURE_2D)
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.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.ActiveTexture(gl.TEXTURE0 + constants.TextureSkybox)
textures[7].Bind(gl.TEXTURE_CUBE_MAP)
helpers.LoadTextureCubeWatched("textures/Above_The_Sea.jpg")
gl.GenerateMipmap(gl.TEXTURE_CUBE_MAP)
gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
//gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.Enable(gl.TEXTURE_CUBE_MAP_SEAMLESS)
ttf.Init()
defer ttf.Quit()
font, _ := ttf.OpenFont("fonts/Symbola.ttf", 64)
color := sdl.Color{255, 255, 255, 255}
surface, _ := font.RenderUTF8_Blended("Bla", color)
defer surface.Free()
gl.ActiveTexture(gl.TEXTURE0 + constants.TextureFont)
textures[8].Bind(gl.TEXTURE_2D)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int(surface.W), int(surface.H), 0, gl.RGBA, gl.UNSIGNED_BYTE, uintptr(surface.Data()))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.ActiveTexture(gl.TEXTURE0)
return &Textures{textures}
}