add more model & shader examples

examples/models/gltf_loading/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"fmt"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(1280)
+	screenHeight := int32(720)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [models] example - gltf loading")
+
+	camera := rl.Camera{}
+	camera.Position = rl.NewVector3(5.0, 5.0, 5.0)
+	camera.Target = rl.NewVector3(0.0, 2.0, 0.0)
+	camera.Up = rl.NewVector3(0.0, 1.0, 0.0)
+	camera.Fovy = 45.0
+	camera.Projection = rl.CameraPerspective
+
+	model := rl.LoadModel("robot.glb")
+
+	animIndex := 0
+	animCurrentFrame := 0
+
+	modelAnims := rl.LoadModelAnimations("robot.glb")
+
+	position := rl.NewVector3(0, 0, 0)
+	rl.DisableCursor()
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		rl.UpdateCamera(&camera, rl.CameraOrbital)
+
+		if rl.IsKeyPressed(rl.KeyUp) {
+			animIndex++
+			if animIndex >= len(modelAnims) {
+				animIndex = 0
+			}
+		}
+		if rl.IsKeyPressed(rl.KeyDown) {
+			animIndex--
+			if animIndex < 0 {
+				animIndex = len(modelAnims) - 1
+			}
+		}
+
+		animPlaying := modelAnims[animIndex]
+		animCurrentFrame = (animCurrentFrame + 1) % int(animPlaying.FrameCount)
+		rl.UpdateModelAnimation(model, animPlaying, int32(animCurrentFrame))
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginMode3D(camera)
+
+		rl.DrawModel(model, position, 0.8, rl.White)
+
+		rl.EndMode3D()
+
+		rl.DrawText("current animation number: "+fmt.Sprint(animIndex), 10, 10, 10, rl.Black)
+		rl.DrawText("UP/DOWN ARROW KEYS CHANGE ANIMATION", 10, 30, 10, rl.Black)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadModel(model)
+
+	rl.CloseWindow()
+}

examples/models/vox_loading/main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(1280)
+	screenHeight := int32(720)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [models] example - voxel loading")
+
+	camera := rl.Camera{}
+	camera.Position = rl.NewVector3(10.0, 10.0, 10.0)
+	camera.Target = rl.NewVector3(0.0, 0.0, 0.0)
+	camera.Up = rl.NewVector3(0.0, 1.0, 0.0)
+	camera.Fovy = 45.0
+	camera.Projection = rl.CameraPerspective
+
+	voxFiles := []string{"knight.vox", "sword.vox", "monument.vox"}
+
+	var models []rl.Model
+
+	for i := 0; i < len(voxFiles); i++ {
+		models = append(models, rl.LoadModel(voxFiles[i]))
+		bb := rl.GetModelBoundingBox(models[i])
+		center := rl.Vector3Zero()
+		center.X = bb.Min.X + ((bb.Max.X - bb.Min.X) / 2)
+		center.Z = bb.Min.Z + ((bb.Max.Z - bb.Min.Z) / 2)
+
+		matTranslate := rl.MatrixTranslate(-center.X, 0, -center.Z)
+		models[i].Transform = matTranslate
+	}
+
+	currentModel := 0
+
+	rl.DisableCursor()
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		rl.UpdateCamera(&camera, rl.CameraOrbital)
+
+		if rl.IsKeyPressed(rl.KeyUp) {
+			currentModel++
+			if currentModel >= len(models) {
+				currentModel = 0
+			}
+
+		}
+		if rl.IsKeyPressed(rl.KeyDown) {
+			currentModel--
+			if currentModel < 0 {
+				currentModel = len(models) - 1
+			}
+
+		}
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginMode3D(camera)
+
+		rl.DrawModel(models[currentModel], rl.Vector3Zero(), 1, rl.White)
+
+		rl.EndMode3D()
+
+		rl.DrawText("current voxel file: "+voxFiles[currentModel], 10, 10, 10, rl.Black)
+		rl.DrawText("UP/DOWN ARROW KEYS CHANGE FILE", 10, 30, 10, rl.Black)
+		rl.DrawText("MOUSE SCROLL OR KEYPAD + / - TO CHANGE ZOOM", 10, 50, 10, rl.Black)
+
+		rl.EndDrawing()
+	}
+
+	for i := 0; i < len(models); i++ {
+		rl.UnloadModel(models[i])
+	}
+
+	rl.CloseWindow()
+}

examples/shaders/eratosthenes/eratosthenes.fs

@@ -0,0 +1,59 @@
+#version 330
+
+/*************************************************************************************
+
+  The Sieve of Eratosthenes -- a simple shader by ProfJski
+  An early prime number sieve: https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
+
+  The screen is divided into a square grid of boxes, each representing an integer value.
+  Each integer is tested to see if it is a prime number.  Primes are colored white.
+  Non-primes are colored with a color that indicates the smallest factor which evenly divdes our integer.
+
+  You can change the scale variable to make a larger or smaller grid.
+  Total number of integers displayed = scale squared, so scale = 100 tests the first 10,000 integers.
+
+  WARNING: If you make scale too large, your GPU may bog down!
+
+***************************************************************************************/
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Output fragment color
+out vec4 finalColor;
+
+// Make a nice spectrum of colors based on counter and maxSize
+vec4 Colorizer(float counter, float maxSize)
+{
+    float red = 0.0, green = 0.0, blue = 0.0;
+    float normsize = counter/maxSize;
+
+    red = smoothstep(0.3, 0.7, normsize);
+    green = sin(3.14159*normsize);
+    blue = 1.0 - smoothstep(0.0, 0.4, normsize);
+
+    return vec4(0.8*red, 0.8*green, 0.8*blue, 1.0);
+}
+
+void main()
+{
+    vec4 color = vec4(1.0);
+    float scale = 1000.0; // Makes 100x100 square grid. Change this variable to make a smaller or larger grid.
+    int value = int(scale*floor(fragTexCoord.y*scale)+floor(fragTexCoord.x*scale));  // Group pixels into boxes representing integer values
+
+    if ((value == 0) || (value == 1) || (value == 2)) finalColor = vec4(1.0);
+    else
+    {
+        for (int i = 2; (i < max(2, sqrt(value) + 1)); i++)
+        {
+            if ((value - i*floor(float(value)/float(i))) == 0)
+            {
+                color = Colorizer(float(i), scale);
+                //break;    // Uncomment to color by the largest factor instead
+            }
+        }
+
+        finalColor = color;
+    }
+}

examples/shaders/eratosthenes/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - Eratosthenes")
+
+	shader := rl.LoadShader("", "eratosthenes.fs")
+	target := rl.LoadRenderTexture(screenWidth, screenHeight)
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		rl.BeginTextureMode(target)
+		rl.ClearBackground(rl.Black)
+		rl.DrawRectangle(0, 0, int32(rl.GetScreenWidth()), int32(rl.GetScreenHeight()), rl.Black)
+		rl.EndTextureMode()
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginShaderMode(shader)
+
+		rl.DrawTextureRec(target.Texture, rl.NewRectangle(0, 0, float32(target.Texture.Width), float32(target.Texture.Height)), rl.Vector2Zero(), rl.White)
+
+		rl.EndShaderMode()
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadShader(shader)
+	rl.UnloadRenderTexture(target)
+
+	rl.CloseWindow()
+}

examples/shaders/texture_outline/main.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - texture outline")
+
+	texture := rl.LoadTexture("gopher.png")
+
+	shader := rl.LoadShader("", "outline.fs")
+
+	cnt := rl.NewVector2(float32(screenWidth/2), float32(screenHeight/2))
+
+	outlineSize := []float32{2}
+	outlineColor := []float32{1, 0, 0, 1}
+	textureSize := []float32{float32(texture.Width), float32(texture.Height)}
+
+	outlineSizeLoc := rl.GetShaderLocation(shader, "outlineSize")
+	outlineColorLoc := rl.GetShaderLocation(shader, "outlineColor")
+	textureSizeLoc := rl.GetShaderLocation(shader, "textureSize")
+
+	rl.SetShaderValue(shader, outlineSizeLoc, outlineSize, rl.ShaderUniformFloat)
+	rl.SetShaderValue(shader, outlineColorLoc, outlineColor, rl.ShaderUniformVec4)
+	rl.SetShaderValue(shader, textureSizeLoc, textureSize, rl.ShaderUniformVec2)
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		if rl.IsKeyPressed(rl.KeyUp) {
+			outlineSize[0]++
+		} else if rl.IsKeyPressed(rl.KeyDown) {
+			outlineSize[0]--
+			if outlineSize[0] < 1 {
+				outlineSize[0] = 1
+			}
+		}
+
+		rl.SetShaderValue(shader, outlineSizeLoc, outlineSize, rl.ShaderUniformFloat)
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginShaderMode(shader)
+
+		rl.DrawTexture(texture, int32(cnt.X)-texture.Width/2, int32(cnt.Y)-texture.Height/2, rl.White)
+
+		rl.EndShaderMode()
+
+		rl.DrawText("UP/DOWN ARROW KEYS INCREASE OUTLINE THICKNESS", 10, 10, 10, rl.Black)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadShader(shader)
+	rl.UnloadTexture(texture)
+
+	rl.CloseWindow()
+}

examples/shaders/texture_outline/outline.fs

@@ -0,0 +1,35 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+uniform vec2 textureSize;
+uniform float outlineSize;
+uniform vec4 outlineColor;
+
+// Output fragment color
+out vec4 finalColor;
+
+void main()
+{
+    vec4 texel = texture(texture0, fragTexCoord);   // Get texel color
+    vec2 texelScale = vec2(0.0);
+    texelScale.x = outlineSize/textureSize.x;
+    texelScale.y = outlineSize/textureSize.y;
+
+    // We sample four corner texels, but only for the alpha channel (this is for the outline)
+    vec4 corners = vec4(0.0);
+    corners.x = texture(texture0, fragTexCoord + vec2(texelScale.x, texelScale.y)).a;
+    corners.y = texture(texture0, fragTexCoord + vec2(texelScale.x, -texelScale.y)).a;
+    corners.z = texture(texture0, fragTexCoord + vec2(-texelScale.x, texelScale.y)).a;
+    corners.w = texture(texture0, fragTexCoord + vec2(-texelScale.x, -texelScale.y)).a;
+
+    float outline = min(dot(corners, vec4(1.0)), 1.0);
+    vec4 color = mix(vec4(0.0), outlineColor, outline);
+    finalColor = mix(color, texel, texel.a);
+}