forked from Thinkofname/steven-go
/
clouds.go
102 lines (90 loc) · 3.01 KB
/
clouds.go
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// Copyright 2015 Matthew Collins
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package steven
import (
"math"
"github.com/go-gl/mathgl/mgl32"
"github.com/thinkofdeath/steven/render"
)
var (
sunModel *render.Model
moonModel *render.Model
moonPhase int = -1
)
func tickClouds(delta float64) {
if Client != nil && Client.WorldType != wtOverworld {
render.DrawClouds = false
if sunModel != nil {
sunModel.Free()
moonModel.Free()
sunModel = nil
moonModel = nil
}
return
}
render.DrawClouds = true
if Client == nil && Client.entity != nil {
return
}
if sunModel == nil {
genSunModel()
}
phase := int((Client.WorldAge / 24000) % 8)
if phase != moonPhase {
moonPhase = phase
genSunModel()
}
x, y, z := Client.entity.Position()
time := Client.WorldTime / 12000
ox := math.Cos(time*math.Pi) * 300
oy := math.Sin(time*math.Pi) * 300
sunModel.Matrix[0] = mgl32.Translate3D(
float32(x+ox),
-float32(y+oy),
float32(z),
).Mul4(mgl32.Rotate3DZ(-float32(time * math.Pi)).Mat4())
moonModel.Matrix[0] = mgl32.Translate3D(
float32(x-ox),
-float32(y-oy),
float32(z),
).Mul4(mgl32.Rotate3DZ(math.Pi - float32(time*math.Pi)).Mat4())
}
func genSunModel() {
if sunModel != nil {
sunModel.Free()
moonModel.Free()
sunModel = nil
moonModel = nil
}
const size = 50
tex := render.GetTexture("environment/sun")
sunModel = render.NewModelCollection([][]*render.ModelVertex{
{
{X: 0, Y: -size, Z: -size, TextureX: 0, TextureY: 1, Texture: tex, R: 255, G: 255, B: 255, A: 255},
{X: 0, Y: size, Z: -size, TextureX: 0, TextureY: 0, Texture: tex, R: 255, G: 255, B: 255, A: 255},
{X: 0, Y: -size, Z: size, TextureX: 1, TextureY: 1, Texture: tex, R: 255, G: 255, B: 255, A: 255},
{X: 0, Y: size, Z: size, TextureX: 1, TextureY: 0, Texture: tex, R: 255, G: 255, B: 255, A: 255},
},
}, render.SunModels)
moon := render.GetTexture("environment/moon_phases")
mpx, mpy := float64(moonPhase%4)*(1/4.0), float64(moonPhase/4)*(1/2.0)
moonModel = render.NewModelCollection([][]*render.ModelVertex{
{
{X: 0, Y: -size, Z: -size, TextureX: mpx, TextureY: mpy + (1 / 2.0), Texture: moon, R: 255, G: 255, B: 255, A: 255},
{X: 0, Y: size, Z: -size, TextureX: mpx, TextureY: mpy, Texture: moon, R: 255, G: 255, B: 255, A: 255},
{X: 0, Y: -size, Z: size, TextureX: mpx + (1 / 4.0), TextureY: mpy + (1 / 2.0), Texture: moon, R: 255, G: 255, B: 255, A: 255},
{X: 0, Y: size, Z: size, TextureX: mpx + (1 / 4.0), TextureY: mpy, Texture: moon, R: 255, G: 255, B: 255, A: 255},
},
}, render.SunModels)
}