func drawUI() {
// Prevent clipping with the world
gl.Clear(gl.DepthBufferBit)
gl.DepthFunc(gl.LessOrEqual)
gl.Enable(gl.Blend)
uiState.program.Use()
uiState.shader.Texture.Int(0)
if uiState.count > 0 {
uiState.array.Bind()
if uiState.maxIndex < uiState.count {
var data []byte
data, uiState.indexType = genElementBuffer(uiState.count)
uiState.indexBuffer.Bind(gl.ElementArrayBuffer)
uiState.indexBuffer.Data(data, gl.DynamicDraw)
uiState.maxIndex = uiState.count
}
uiState.shader.ScreenSize.Float2(float32(lastWidth), float32(lastHeight))
uiState.buffer.Bind(gl.ArrayBuffer)
if len(uiState.data) > uiState.prevSize {
uiState.prevSize = len(uiState.data)
uiState.buffer.Data(uiState.data, gl.StreamDraw)
} else {
target := uiState.buffer.Map(gl.WriteOnly, len(uiState.data))
copy(target, uiState.data)
uiState.buffer.Unmap()
}
gl.DrawElements(gl.Triangles, uiState.count, uiState.indexType, 0)
}
gl.Disable(gl.Blend)
gl.DepthFunc(gl.LessOrEqual)
uiState.count = 0
uiState.data = uiState.data[:0]
}
// Draw draws a single frame
func Draw(width, height int, delta float64) {
tickAnimatedTextures(delta)
frameID++
sync:
for {
select {
case f := <-syncChan:
f()
default:
break sync
}
}
// Only update the viewport if the window was resized
if lastHeight != height || lastWidth != width || lastFOV != FOV.Value() {
lastWidth = width
lastHeight = height
lastFOV = FOV.Value()
perspectiveMatrix = mgl32.Perspective(
(math.Pi/180)*float32(lastFOV),
float32(width)/float32(height),
0.1,
500.0,
)
gl.Viewport(0, 0, width, height)
frustum.SetPerspective(
(math.Pi/180)*float32(lastFOV),
float32(width)/float32(height),
0.1,
500.0,
)
initTrans()
}
mainFramebuffer.Bind()
gl.Enable(gl.Multisample)
gl.ActiveTexture(0)
glTexture.Bind(gl.Texture2DArray)
gl.ClearColor(ClearColour.R, ClearColour.G, ClearColour.B, 1.0)
gl.Clear(gl.ColorBufferBit | gl.DepthBufferBit)
chunkProgram.Use()
viewVector = mgl32.Vec3{
float32(math.Cos(Camera.Yaw-math.Pi/2) * -math.Cos(Camera.Pitch)),
float32(-math.Sin(Camera.Pitch)),
float32(-math.Sin(Camera.Yaw-math.Pi/2) * -math.Cos(Camera.Pitch)),
}
cam := mgl32.Vec3{-float32(Camera.X), -float32(Camera.Y), float32(Camera.Z)}
cameraMatrix = mgl32.LookAtV(
cam,
cam.Add(mgl32.Vec3{-viewVector.X(), -viewVector.Y(), viewVector.Z()}),
mgl32.Vec3{0, -1, 0},
)
cameraMatrix = cameraMatrix.Mul4(mgl32.Scale3D(-1.0, 1.0, 1.0))
frustum.SetCamera(
cam,
cam.Add(mgl32.Vec3{-viewVector.X(), -viewVector.Y(), viewVector.Z()}),
mgl32.Vec3{0, -1, 0},
)
shaderChunk.PerspectiveMatrix.Matrix4(&perspectiveMatrix)
shaderChunk.CameraMatrix.Matrix4(&cameraMatrix)
shaderChunk.Texture.Int(0)
shaderChunk.LightLevel.Float(LightLevel)
shaderChunk.SkyOffset.Float(SkyOffset)
chunkPos := position{
X: int(Camera.X) >> 4,
Y: int(Camera.Y) >> 4,
Z: int(Camera.Z) >> 4,
}
nearestBuffer = buffers[chunkPos]
for _, dir := range direction.Values {
validDirs[dir] = viewVector.Dot(dir.AsVec()) > -0.8
}
renderOrder = renderOrder[:0]
renderBuffer(nearestBuffer, chunkPos, direction.Invalid, delta)
drawLines()
drawModels()
clouds.tick(delta)
chunkProgramT.Use()
shaderChunkT.PerspectiveMatrix.Matrix4(&perspectiveMatrix)
shaderChunkT.CameraMatrix.Matrix4(&cameraMatrix)
shaderChunkT.Texture.Int(0)
shaderChunkT.LightLevel.Float(LightLevel)
shaderChunkT.SkyOffset.Float(SkyOffset)
// Copy the depth buffer
mainFramebuffer.BindRead()
transFramebuffer.BindDraw()
gl.BlitFramebuffer(
0, 0, lastWidth, lastHeight,
0, 0, lastWidth, lastHeight,
gl.DepthBufferBit, gl.Nearest,
)
gl.Enable(gl.Blend)
gl.DepthMask(false)
transFramebuffer.Bind()
gl.ClearColor(0, 0, 0, 1)
gl.Clear(gl.ColorBufferBit)
gl.ClearBuffer(gl.Color, 0, []float32{0, 0, 0, 1})
gl.ClearBuffer(gl.Color, 1, []float32{0, 0, 0, 0})
gl.BlendFuncSeparate(gl.OneFactor, gl.OneFactor, gl.ZeroFactor, gl.OneMinusSrcAlpha)
for _, chunk := range renderOrder {
if chunk.countT > 0 && chunk.bufferT.IsValid() {
shaderChunkT.Offset.Int3(chunk.X, chunk.Y*4096-chunk.Y*int(4096*(1-chunk.progress)), chunk.Z)
chunk.arrayT.Bind()
gl.DrawElements(gl.Triangles, chunk.countT, elementBufferType, 0)
}
}
gl.UnbindFramebuffer()
gl.Disable(gl.DepthTest)
gl.Clear(gl.ColorBufferBit)
gl.Disable(gl.Blend)
transDraw()
gl.Enable(gl.DepthTest)
gl.DepthMask(true)
gl.BlendFunc(gl.SrcAlpha, gl.OneMinusSrcAlpha)
gl.Disable(gl.Multisample)
drawUI()
if debugFramebuffers.Value() {
gl.Enable(gl.Multisample)
blitBuffers()
gl.Disable(gl.Multisample)
}
}