From 4b88d9867b0fa6408ccb6182419fb5a7e4dbfbe4 Mon Sep 17 00:00:00 2001
From: unkl nik <nscronwright@gmail.com>
Date: Sun, 15 Oct 2023 20:02:24 +0200
Subject: [PATCH] Add Color Mix Example

---
 examples/shaders/multi_sample2d/color_mix.fs | 27 ++++++++
 examples/shaders/multi_sample2d/main.go      | 69 ++++++++++++++++++++
 2 files changed, 96 insertions(+)
 create mode 100644 examples/shaders/multi_sample2d/color_mix.fs
 create mode 100644 examples/shaders/multi_sample2d/main.go

diff --git a/examples/shaders/multi_sample2d/color_mix.fs b/examples/shaders/multi_sample2d/color_mix.fs
new file mode 100644
index 0000000..e794d32
--- /dev/null
+++ b/examples/shaders/multi_sample2d/color_mix.fs
@@ -0,0 +1,27 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec3 vertexPos;
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform sampler2D texture1;
+uniform vec4 colDiffuse;
+
+uniform float divider = 0.5;
+
+out vec4 finalColor;
+
+void main()
+{
+    // Texel color fetching from texture sampler
+    vec4 texelColor0 = texture(texture0, fragTexCoord);
+    vec4 texelColor1 = texture(texture1, fragTexCoord);
+
+    float x = fract(fragTexCoord.s);
+    float final = smoothstep(divider - 0.1, divider + 0.1, x);
+
+    finalColor = mix(texelColor0, texelColor1, final);
+}
\ No newline at end of file
diff --git a/examples/shaders/multi_sample2d/main.go b/examples/shaders/multi_sample2d/main.go
new file mode 100644
index 0000000..6ebbc03
--- /dev/null
+++ b/examples/shaders/multi_sample2d/main.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	rl.SetConfigFlags(rl.FlagMsaa4xHint) // Enable Multi Sampling Anti Aliasing 4x (if available)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - multiple sample2D")
+
+	imRed := rl.GenImageColor(int(screenWidth), int(screenHeight), rl.NewColor(uint8(255), uint8(0), uint8(0), uint8(255)))
+	texRed := rl.LoadTextureFromImage(imRed)
+	rl.UnloadImage(imRed)
+
+	imBlue := rl.GenImageColor(int(screenWidth), int(screenHeight), rl.NewColor(uint8(0), uint8(0), uint8(255), uint8(255)))
+	texBlue := rl.LoadTextureFromImage(imBlue)
+	rl.UnloadImage(imBlue)
+
+	shader := rl.LoadShader("", "color_mix.fs")
+
+	texBlueLoc := rl.GetShaderLocation(shader, "texture1")
+	dividerLoc := rl.GetShaderLocation(shader, "divider")
+	dividerValue := []float32{0.5}
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		if rl.IsKeyDown(rl.KeyRight) {
+			dividerValue[0] += 0.01
+		} else if rl.IsKeyDown(rl.KeyLeft) {
+			dividerValue[0] -= 0.01
+		}
+
+		if dividerValue[0] < 0 {
+			dividerValue[0] = 0
+		} else if dividerValue[0] > 1 {
+			dividerValue[0] = 1
+		}
+
+		rl.SetShaderValue(shader, dividerLoc, dividerValue, rl.ShaderUniformFloat)
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginShaderMode(shader)
+
+		rl.SetShaderValueTexture(shader, texBlueLoc, texBlue)
+		rl.DrawTexture(texRed, 0, 0, rl.White)
+
+		rl.EndShaderMode()
+
+		rl.DrawText("USE LEFT/RIGHT ARROW KEYS TO MIX COLORS", 15, 17, 20, rl.Black)
+		rl.DrawText("USE LEFT/RIGHT ARROW KEYS TO MIX COLORS", 16, 16, 20, rl.White)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadShader(shader)   // Unload shader
+	rl.UnloadTexture(texRed)  // Unload texture
+	rl.UnloadTexture(texBlue) // Unload texture
+
+	rl.CloseWindow()
+}