add go-jetpack-clouds shader example

examples/shaders/go-jetpack-clouds/README.md

@@ -0,0 +1,7 @@
+# Go Jetpack
+by [Branson Camp](https://github.com/bcamp1) using [Pixel](https://github.com/faiface/pixel)
+
+Welcome to Go-Jetpack, where you explore the skies using WASD or Arrow Keys.
+This example showcases most of the fundamental pixel elements described in the [Pixel Wiki](https://github.com/faiface/pixel/wiki)
+
+![Screenshot](https://github.com/bcamp1/pixel/blob/master/examples/community/go-jetpack/screenshot.png)

examples/shaders/go-jetpack-clouds/jetpack.go

@@ -0,0 +1,354 @@
+package main
+
+import (
+	"fmt"
+	"image"
+	"io/ioutil"
+	"os"
+	"time"
+
+	"github.com/go-gl/mathgl/mgl32"
+
+	_ "image/png"
+
+	"github.com/faiface/pixel"
+	"github.com/faiface/pixel/pixelgl"
+	"github.com/faiface/pixel/text"
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/colornames"
+)
+
+// InstallShader ...
+func InstallShader(c *pixelgl.Canvas, uTime *float32, uMouse, uGopherPos *mgl32.Vec2) {
+	c.BindUniform("u_time", uTime)
+	c.BindUniform("u_mouse", uMouse)
+	c.BindUniform("u_gopherpos", uGopherPos)
+	c.SetFragmentShader(cloudsFragmentShader)
+	c.UpdateShader()
+}
+
+func loadPicture(path string) (pixel.Picture, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	img, _, err := image.Decode(file)
+	if err != nil {
+		return nil, err
+	}
+	return pixel.PictureDataFromImage(img), nil
+}
+
+func loadSprite(path string) (pixel.Sprite, error) {
+	pic, err := loadPicture(path)
+	if err != nil {
+		return *pixel.NewSprite(pic, pic.Bounds()), err
+	}
+	sprite := pixel.NewSprite(pic, pic.Bounds())
+	return *sprite, nil
+}
+
+func loadTTF(path string, size float64, origin pixel.Vec) *text.Text {
+	file, err := os.Open(path)
+	if err != nil {
+		panic(err)
+	}
+	defer file.Close()
+
+	bytes, err := ioutil.ReadAll(file)
+	if err != nil {
+		panic(err)
+	}
+
+	font, err := truetype.Parse(bytes)
+	if err != nil {
+		panic(err)
+	}
+
+	face := truetype.NewFace(font, &truetype.Options{
+		Size:              size,
+		GlyphCacheEntries: 1,
+	})
+
+	atlas := text.NewAtlas(face, text.ASCII)
+
+	txt := text.New(origin, atlas)
+
+	return txt
+
+}
+
+func run() {
+	// Set up window configs
+	cfg := pixelgl.WindowConfig{ // Default: 1024 x 768
+		Title:  "Golang Jetpack!",
+		Bounds: pixel.R(0, 0, 1024, 768),
+		VSync:  true,
+	}
+	win, err := pixelgl.NewWindow(cfg)
+	if err != nil {
+		panic(err)
+	}
+
+	// Importantr variables
+	var jetX, jetY, velX, velY, radians float64
+	flipped := 1.0
+	jetpackOn := false
+	gravity := 0.6 // Default: 0.004
+	jetAcc := 0.9  // Default: 0.008
+	tilt := 0.01   // Default: 0.001
+	whichOn := false
+	onNumber := 0
+	jetpackOffName := "jetpack.png"
+	jetpackOn1Name := "jetpack-on.png"
+	jetpackOn2Name := "jetpack-on2.png"
+	camVector := win.Bounds().Center()
+
+	var uTime float32
+	var uMouse, uGopherPos mgl32.Vec2
+
+	bounds := win.Bounds()
+	bounds.Max = bounds.Max.ScaledXY(pixel.V(1.0, 1.0))
+
+	canvas := pixelgl.NewCanvas(bounds)
+
+	InstallShader(canvas, &uTime, &uMouse, &uGopherPos)
+
+	bg, _ := loadSprite("sky.png")
+	bg.Draw(canvas, pixel.IM)
+
+	// Jetpack - Rendering
+	jetpackOff, err := loadSprite(jetpackOffName)
+	if err != nil {
+		panic(err)
+	}
+	jetpackOn1, err := loadSprite(jetpackOn1Name)
+	if err != nil {
+		panic(err)
+	}
+	jetpackOn2, err := loadSprite(jetpackOn2Name)
+	if err != nil {
+		panic(err)
+	}
+
+	// Tutorial Text
+	txt := loadTTF("intuitive.ttf", 50, pixel.V(win.Bounds().Center().X-450, win.Bounds().Center().Y-200))
+	fmt.Fprintf(txt, "Explore the Skies with WASD or Arrow Keys!")
+
+	currentSprite := jetpackOff
+	start := time.Now()
+
+	// Game Loop
+	for !win.Closed() {
+		uTime = float32(time.Since(start).Seconds())
+		mpos := win.MousePosition()
+		uMouse[0] = float32(mpos.X)
+		uMouse[1] = float32(mpos.Y)
+
+		win.SetTitle(fmt.Sprint(uGopherPos))
+
+		win.Clear(colornames.Green)
+
+		// Jetpack - Controls
+		jetpackOn = win.Pressed(pixelgl.KeyUp) || win.Pressed(pixelgl.KeyW)
+
+		if win.Pressed(pixelgl.KeyRight) || win.Pressed(pixelgl.KeyD) {
+			jetpackOn = true
+			flipped = -1
+			radians -= tilt
+			velX += tilt * 30
+		} else if win.Pressed(pixelgl.KeyLeft) || win.Pressed(pixelgl.KeyA) {
+			jetpackOn = true
+			flipped = 1
+			radians += tilt
+			velX -= tilt * 30
+		} else {
+			if velX < 0 {
+				radians -= tilt / 3
+				velX += tilt * 10
+			} else if velX > 0 {
+				radians += tilt / 3
+				velX -= tilt * 10
+			}
+		}
+		if jetY < 0 {
+			jetY = 0
+			velY = -0.3 * velY
+		}
+
+		if jetpackOn {
+			velY += jetAcc
+			whichOn = !whichOn
+			onNumber++
+			if onNumber == 5 { // every 5 frames, toggle anijetMation
+				onNumber = 0
+				if whichOn {
+					currentSprite = jetpackOn1
+				} else {
+					currentSprite = jetpackOn2
+				}
+			}
+		} else {
+			currentSprite = jetpackOff
+			velY -= gravity
+		}
+
+		positionVector := pixel.V(win.Bounds().Center().X+jetX, win.Bounds().Center().Y+jetY-372)
+		jetMat := pixel.IM
+		jetMat = jetMat.Scaled(pixel.ZV, 4)
+		jetMat = jetMat.Moved(positionVector)
+		jetMat = jetMat.ScaledXY(positionVector, pixel.V(flipped, 1))
+		jetMat = jetMat.Rotated(positionVector, radians)
+
+		jetX += velX
+		jetY += velY
+		uGopherPos[0] = float32(jetX*0.01 + 1.0)
+		uGopherPos[1] = float32(jetY*0.01 + 1.0)
+		// Camera
+		camVector.X += (positionVector.X - camVector.X) * 0.2
+		camVector.Y += (positionVector.Y - camVector.Y) * 0.2
+
+		if camVector.X > 25085 {
+			camVector.X = 25085
+		} else if camVector.X < -14843 {
+			camVector.X = -14843
+		}
+
+		if camVector.Y > 22500 {
+			camVector.Y = 22500
+		}
+
+		cam := pixel.IM.Moved(win.Bounds().Center().Sub(camVector))
+
+		win.SetMatrix(cam)
+
+		// Drawing to the screen
+		win.SetSmooth(true)
+
+		//bg.Draw(canvas, pixel.IM.Moved(pixel.V(win.Bounds().Center().X, win.Bounds().Center().Y+766)))
+		bg.Draw(canvas, pixel.IM)
+
+		canvas.Draw(win, pixel.IM.Moved(camVector))
+		txt.Draw(win, pixel.IM)
+		win.SetSmooth(false)
+		currentSprite.Draw(win, jetMat)
+
+		win.Update()
+	}
+
+}
+
+func main() {
+	pixelgl.Run(run)
+}
+
+var cloudsFragmentShader = `
+#version 330 core
+
+#ifdef GL_ES
+precision highp float;
+#endif
+
+#define HOW_CLOUDY 0.4
+#define SHADOW_THRESHOLD 0.2
+#define SHADOW 0.2
+#define SUBSURFACE 1.0
+#define WIND_DIRECTION 5.0
+#define TIME_SCALE 1.7
+#define SCALE 0.3
+#define ENABLE_SHAFTS
+in vec2 texcoords;
+out vec4 fragColor;
+mat2 RM = mat2(cos(WIND_DIRECTION), -sin(WIND_DIRECTION), sin(WIND_DIRECTION), cos(WIND_DIRECTION));
+uniform float u_time;
+uniform vec2 u_mouse;
+//uniform vec2 u_resolution;
+uniform vec4 u_texbounds;
+uniform sampler2D u_texture;
+uniform vec2 u_gopherpos;
+ 
+float hash( float n )
+{
+    return fract(sin(n)*758.5453);
+}
+ 
+float noise( in vec3 x )
+{
+    vec3 p = floor(x);
+    vec3 f = fract(x);
+    float n = p.x + p.y*57.0 + p.z*800.0;
+    float res = mix(mix(mix( hash(n+  0.0), hash(n+  1.0),f.x), mix( hash(n+ 57.0), hash(n+ 58.0),f.x),f.y),
+            mix(mix( hash(n+800.0), hash(n+801.0),f.x), mix( hash(n+857.0), hash(n+858.0),f.x),f.y),f.z);
+    return res;
+}
+
+float fbm( vec3 p )
+{
+    float f = 0.0;
+    f += 0.50000*noise( p ); p = p*2.02;
+    f -= 0.25000*noise( p ); p = p*2.03;
+    f += 0.12500*noise( p ); p = p*3.01;
+    f += 0.06250*noise( p ); p = p*3.04;
+    f += 0.03500*noise( p ); p = p*4.01;
+    f += 0.01250*noise( p ); p = p*4.04;
+    f -= 0.00125*noise( p );
+    return f/0.984375;
+}
+ 
+float cloud(vec3 p)
+{
+    p-=fbm(vec3(p.x,p.y,0.0)*0.5)*1.25;
+    float a = min((fbm(p*3.0)*2.2-1.1), 0.0);
+    return a*a;
+}
+ 
+float shadow = 1.0;
+ 
+ 
+float clouds(vec2 p){
+    float ic = cloud(vec3(p * 2.0, u_time*0.01 * TIME_SCALE)) / HOW_CLOUDY;
+    float init = smoothstep(0.1, 1.0, ic) * 10.0;
+    shadow = smoothstep(0.0, SHADOW_THRESHOLD, ic) * SHADOW + (1.0 - SHADOW);
+    init = (init * cloud(vec3(p * (6.0), u_time*0.01 * TIME_SCALE)) * ic);
+    init = (init * (cloud(vec3(p * (11.0), u_time*0.01 * TIME_SCALE))*0.5 + 0.4) * init);
+    return min(1.0, init);
+}
+//uniform sampler2D bb;
+float cloudslowres(vec2 p){
+    return 1.0 - (texture(u_texture, p).a - 0.9) * 10.0;
+}
+ 
+vec2 ratio = vec2(1.0, 1.0);
+ 
+vec4 getresult(){
+	vec2 uvmouse = (u_mouse/(texcoords - u_texbounds.xy));
+	vec2 t = (texcoords - u_texbounds.xy) / u_texbounds.zw;
+    vec2 surfacePosition = ((( t ) * vec2(u_gopherpos.x , u_gopherpos.y)) * 2.0 - 1.0)*SCALE;
+	vec2 position = ( surfacePosition);
+	vec2 sun = (uvmouse.xy * vec2(texcoords.x / texcoords.y+1.1, 1.0)*2.0-1.0) * SCALE;
+    
+    float dst = distance(sun * ratio, position * ratio);
+    float suni = pow(dst + 1.0, -10.0);
+    float shaft =0.0;
+    float st = 0.05;
+    float w = 1.0;
+    vec2 dir = sun - position;
+    float c = clouds(position);
+    #ifdef ENABLE_SHAFTS
+    for(int i=0;i<50;i++){
+        float occl = cloudslowres(clamp((t) + dir * st, 0.0, 1.0));
+        w *= 0.99;
+        st *= 1.05;
+        shaft += max(0.0, (1.0 - occl)) * w;
+    }
+    #endif
+    shadow = min(1.0, shadow + suni * suni * 0.2 * SUBSURFACE);
+    suni *= (shaft * 0.03);
+    return vec4(pow(mix(vec3(shadow), pow(vec3(0.23, 0.33, 0.48), vec3(2.2)) + suni, c), vec3(1.0/2.2)), c*0.1 + 0.9);     
+}
+ 
+void main( void ) {
+    fragColor = getresult().rgba;
+}
+`

examples/shaders/go-jetpack-clouds/jetpack.go.asd

@@ -0,0 +1,320 @@
+package main
+
+import (
+	"fmt"
+	"image"
+	"io/ioutil"
+	"os"
+
+	_ "image/png"
+
+	"github.com/faiface/pixel"
+	"github.com/faiface/pixel/pixelgl"
+	"github.com/faiface/pixel/text"
+	"github.com/go-gl/mathgl/mgl32"
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/colornames"
+)
+
+var fragmentShader = `// afl_ext @ 2016
+ 
+#ifdef GL_ES
+precision highp float;
+#endif
+ 
+#extension GL_OES_standard_derivatives : enable
+ 
+#define HOW_CLOUDY 0.4
+#define SHADOW_THRESHOLD 0.2
+#define SHADOW 0.2
+#define SUBSURFACE 1.0
+#define WIND_DIRECTION 5.0
+#define TIME_SCALE 1.7
+#define SCALE 0.3
+#define ENABLE_SHAFTS
+ 
+#define iGlobalTime time
+#define iMouse (mouse.xy * resolution.xy)
+#define iResolution resolution
+ 
+mat2 RM = mat2(cos(WIND_DIRECTION), -sin(WIND_DIRECTION), sin(WIND_DIRECTION), cos(WIND_DIRECTION));
+uniform float time;
+uniform vec2 mouse;
+uniform vec2 resolution;
+ 
+float hash( float n )
+{
+    return fract(sin(n)*758.5453);
+}
+ 
+float noise( in vec3 x )
+{
+    vec3 p = floor(x);
+    vec3 f = fract(x);
+    float n = p.x + p.y*57.0 + p.z*800.0;
+    float res = mix(mix(mix( hash(n+  0.0), hash(n+  1.0),f.x), mix( hash(n+ 57.0), hash(n+ 58.0),f.x),f.y),
+            mix(mix( hash(n+800.0), hash(n+801.0),f.x), mix( hash(n+857.0), hash(n+858.0),f.x),f.y),f.z);
+    return res;
+}
+ 
+float fbm( vec3 p )
+{
+    float f = 0.0;
+    f += 0.50000*noise( p ); p = p*2.02;
+    f -= 0.25000*noise( p ); p = p*2.03;
+    f += 0.12500*noise( p ); p = p*3.01;
+    f += 0.06250*noise( p ); p = p*3.04;
+    f += 0.03500*noise( p ); p = p*4.01;
+    f += 0.01250*noise( p ); p = p*4.04;
+    f -= 0.00125*noise( p );
+    return f/0.984375;
+}
+ 
+float cloud(vec3 p)
+{
+    p-=fbm(vec3(p.x,p.y,0.0)*0.5)*1.25;
+    float a = min((fbm(p*3.0)*2.2-1.1), 0.0);
+    return a*a;
+}
+ 
+float shadow = 1.0;
+ 
+ 
+float clouds(vec2 p){
+    float ic = cloud(vec3(p * 2.0, iGlobalTime*0.01 * TIME_SCALE)) / HOW_CLOUDY;
+    float init = smoothstep(0.1, 1.0, ic) * 10.0;
+    shadow = smoothstep(0.0, SHADOW_THRESHOLD, ic) * SHADOW + (1.0 - SHADOW);
+    init = (init * cloud(vec3(p * (6.0), iGlobalTime*0.01 * TIME_SCALE)) * ic);
+    init = (init * (cloud(vec3(p * (11.0), iGlobalTime*0.01 * TIME_SCALE))*0.5 + 0.4) * init);
+    return min(1.0, init);
+}
+uniform sampler2D bb;
+float cloudslowres(vec2 p){
+    return 1.0 - (texture2D(bb, p).a - 0.9) * 10.0;
+}
+ 
+vec2 ratio = vec2(1.0, 1.0);
+ 
+vec4 getresult(){
+    vec2 surfacePosition = ((( gl_FragCoord.xy / iResolution.xy ) * vec2(iResolution.x / iResolution.y, 1.0)) * 2.0 - 1.0)*SCALE;
+    vec2 position = ( surfacePosition);
+    vec2 sun = ((iMouse.xy/ iResolution.xy)* vec2(iResolution.x / iResolution.y, 1.0)*2.0-1.0) * SCALE;
+    float dst = distance(sun * ratio, position * ratio);
+    float suni = pow(dst + 1.0, -10.0);
+    float shaft =0.0;
+    float st = 0.05;
+    float w = 1.0;
+    vec2 dir = sun - position;
+    float c = clouds(position);
+    #ifdef ENABLE_SHAFTS
+    for(int i=0;i<50;i++){
+        float occl = cloudslowres(clamp((gl_FragCoord.xy / iResolution.xy) + dir * st, 0.0, 1.0));
+        w *= 0.99;
+        st *= 1.05;
+        shaft += max(0.0, (1.0 - occl)) * w;
+    }
+    #endif
+    shadow = min(1.0, shadow + suni * suni * 0.2 * SUBSURFACE);
+    suni *= (shaft * 0.03);
+    return vec4(pow(mix(vec3(shadow), pow(vec3(0.23, 0.33, 0.48), vec3(2.2)) + suni, c), vec3(1.0/2.2)), c*0.1 + 0.9);     
+}
+ 
+void main( void ) {
+    gl_FragColor = getresult().rgba;
+}
+`
+
+func loadPicture(path string) (pixel.Picture, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	img, _, err := image.Decode(file)
+	if err != nil {
+		return nil, err
+	}
+	return pixel.PictureDataFromImage(img), nil
+}
+
+func loadSprite(path string) (pixel.Sprite, error) {
+	pic, err := loadPicture(path)
+	if err != nil {
+		return *pixel.NewSprite(pic, pic.Bounds()), err
+	}
+	sprite := pixel.NewSprite(pic, pic.Bounds())
+	return *sprite, nil
+}
+
+func loadTTF(path string, size float64, origin pixel.Vec) *text.Text {
+	file, err := os.Open(path)
+	if err != nil {
+		panic(err)
+	}
+	defer file.Close()
+
+	bytes, err := ioutil.ReadAll(file)
+	if err != nil {
+		panic(err)
+	}
+
+	font, err := truetype.Parse(bytes)
+	if err != nil {
+		panic(err)
+	}
+
+	face := truetype.NewFace(font, &truetype.Options{
+		Size:              size,
+		GlyphCacheEntries: 1,
+	})
+
+	atlas := text.NewAtlas(face, text.ASCII)
+
+	txt := text.New(origin, atlas)
+
+	return txt
+
+}
+
+func run() {
+	// Set up window configs
+
+	b := pixel.R(0, 0, 1024, 768)
+
+	cfg := pixelgl.WindowConfig{ // Default: 1024 x 768
+		Title:  "Golang Jetpack!",
+		Bounds: b,
+		VSync:  true,
+	}
+	win, err := pixelgl.NewWindow(cfg)
+	if err != nil {
+		panic(err)
+	}
+
+	// Importantr variables
+	var jetX, jetY, velX, velY, radians float64
+	flipped := 1.0
+	jetpackOn := false
+	gravity := 0.6 // Default: 0.004
+	jetAcc := 0.9  // Default: 0.008
+	tilt := 0.01   // Default: 0.001
+	whichOn := false
+	onNumber := 0
+	jetpackName := "jetpack.png"
+	camVector := win.Bounds().Center()
+
+	bg, _ := loadSprite("sky.png")
+
+	c := pixelgl.NewCanvas(b)
+
+	var mouse mgl32.Vec2
+	var resolution mgl32.Vec2
+	var t float32
+	c.BindUniform("mouse", &mouse)
+	c.BindUniform("resolution", &resolution)
+	c.BindUniform("time", &t)
+	c.SetFragmentShader(fragmentShader)
+	c.UpdateShader()
+
+	// Tutorial Text
+	txt := loadTTF("intuitive.ttf", 50, pixel.V(win.Bounds().Center().X-450, win.Bounds().Center().Y-200))
+	fmt.Fprintf(txt, "Explore the Skies with WASD or Arrow Keys!")
+
+	// Game Loop
+	for !win.Closed() {
+		win.Update()
+		win.Clear(colornames.Green)
+
+		// Jetpack - Controls
+		jetpackOn = win.Pressed(pixelgl.KeyUp) || win.Pressed(pixelgl.KeyW)
+
+		if win.Pressed(pixelgl.KeyRight) || win.Pressed(pixelgl.KeyD) {
+			jetpackOn = true
+			flipped = -1
+			radians -= tilt
+			velX += tilt * 30
+		} else if win.Pressed(pixelgl.KeyLeft) || win.Pressed(pixelgl.KeyA) {
+			jetpackOn = true
+			flipped = 1
+			radians += tilt
+			velX -= tilt * 30
+		} else {
+			if velX < 0 {
+				radians -= tilt / 3
+				velX += tilt * 10
+			} else if velX > 0 {
+				radians += tilt / 3
+				velX -= tilt * 10
+			}
+		}
+		if jetY < 0 {
+			jetY = 0
+			velY = -0.3 * velY
+		}
+
+		if jetpackOn {
+			velY += jetAcc
+			whichOn = !whichOn
+			onNumber += 1
+			if onNumber == 5 { // every 5 frames, toggle anijetMation
+				onNumber = 0
+				if whichOn {
+					jetpackName = "jetpack-on.png"
+				} else {
+					jetpackName = "jetpack-on2.png"
+				}
+			}
+		} else {
+			jetpackName = "jetpack.png"
+			velY -= gravity
+		}
+
+		// Jetpack - Rendering
+		jetpack, err := loadSprite(jetpackName)
+		if err != nil {
+			panic(err)
+		}
+
+		positionVector := pixel.V(win.Bounds().Center().X+jetX, win.Bounds().Center().Y+jetY-372)
+		jetMat := pixel.IM
+		jetMat = jetMat.Scaled(pixel.ZV, 4)
+		jetMat = jetMat.Moved(positionVector)
+		jetMat = jetMat.ScaledXY(positionVector, pixel.V(flipped, 1))
+		jetMat = jetMat.Rotated(positionVector, radians)
+
+		jetX += velX
+		jetY += velY
+
+		// Camera
+		camVector.X += (positionVector.X - camVector.X) * 0.2
+		camVector.Y += (positionVector.Y - camVector.Y) * 0.2
+
+		if camVector.X > 25085 {
+			camVector.X = 25085
+		} else if camVector.X < -14843 {
+			camVector.X = -14843
+		}
+
+		if camVector.Y > 22500 {
+			camVector.Y = 22500
+		}
+
+		cam := pixel.IM.Moved(win.Bounds().Center().Sub(camVector))
+
+		win.SetMatrix(cam)
+
+		// Drawing to the screen
+		win.SetSmooth(true)
+		bg.Draw(win, pixel.IM.Moved(pixel.V(win.Bounds().Center().X, win.Bounds().Center().Y+766)).Scaled(pixel.ZV, 10))
+		txt.Draw(win, pixel.IM)
+		win.SetSmooth(false)
+		c.Draw(win, pixel.IM)
+		jetpack.Draw(win, jetMat)
+
+	}
+
+}
+
+func main() {
+	pixelgl.Run(run)
+}