step

examples/textures/image_processing/main.go

@@ -0,0 +1,135 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+const numProcesses = 8
+
+// Process
+const (
+	None = iota
+	ColorGrayscale
+	ColorTint
+	ColorInvert
+	ColorContrast
+	ColorBrightness
+	FlipVertical
+	FlipHorizontal
+)
+
+var processText = []string{
+	"NO PROCESSING",
+	"COLOR GRAYSCALE",
+	"COLOR TINT",
+	"COLOR INVERT",
+	"COLOR CONTRAST",
+	"COLOR BRIGHTNESS",
+	"FLIP VERTICAL",
+	"FLIP HORIZONTAL",
+}
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [textures] example - image processing")
+
+	image := rl.LoadImage("parrots.png")           // Loaded in CPU memory (RAM)
+	rl.ImageFormat(image, rl.UncompressedR8g8b8a8) // Format image to RGBA 32bit (required for texture update)
+	texture := rl.LoadTextureFromImage(image)      // Image converted to texture, GPU memory (VRAM)
+
+	currentProcess := None
+	textureReload := false
+
+	selectRecs := make([]rl.Rectangle, numProcesses)
+
+	for i := 0; i < numProcesses; i++ {
+		selectRecs[i] = rl.NewRectangle(40, 50+32*float32(i), 150, 30)
+	}
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+		if rl.IsKeyPressed(rl.KeyDown) {
+			currentProcess++
+			if currentProcess > 7 {
+				currentProcess = 0
+			}
+			textureReload = true
+		} else if rl.IsKeyPressed(rl.KeyUp) {
+			currentProcess--
+			if currentProcess < 0 {
+				currentProcess = 7
+			}
+			textureReload = true
+		}
+
+		if textureReload {
+			rl.UnloadImage(image)               // Unload current image data
+			image = rl.LoadImage("parrots.png") // Re-load image data
+
+			// NOTE: Image processing is a costly CPU process to be done every frame,
+			// If image processing is required in a frame-basis, it should be done
+			// with a texture and by shaders
+			switch currentProcess {
+			case ColorGrayscale:
+				rl.ImageColorGrayscale(image)
+				break
+			case ColorTint:
+				rl.ImageColorTint(image, rl.Green)
+				break
+			case ColorInvert:
+				rl.ImageColorInvert(image)
+				break
+			case ColorContrast:
+				rl.ImageColorContrast(image, -40)
+				break
+			case ColorBrightness:
+				rl.ImageColorBrightness(image, -80)
+				break
+			case FlipVertical:
+				rl.ImageFlipVertical(image)
+				break
+			case FlipHorizontal:
+				rl.ImageFlipHorizontal(image)
+				break
+			default:
+				break
+			}
+
+			pixels := rl.LoadImageColors(image) // Get pixel data from image (RGBA 32bit)
+			rl.UpdateTexture(texture, pixels)   // Update texture with new image data
+
+			textureReload = false
+		}
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawText("IMAGE PROCESSING:", 40, 30, 10, rl.DarkGray)
+
+		// Draw rectangles
+		for i := 0; i < numProcesses; i++ {
+			if i == currentProcess {
+				rl.DrawRectangleRec(selectRecs[i], rl.SkyBlue)
+				rl.DrawRectangleLines(int32(selectRecs[i].X), int32(selectRecs[i].Y), int32(selectRecs[i].Width), int32(selectRecs[i].Height), rl.Blue)
+				rl.DrawText(processText[i], int32(selectRecs[i].X+selectRecs[i].Width/2)-rl.MeasureText(processText[i], 10)/2, int32(selectRecs[i].Y)+11, 10, rl.DarkBlue)
+			} else {
+				rl.DrawRectangleRec(selectRecs[i], rl.LightGray)
+				rl.DrawRectangleLines(int32(selectRecs[i].X), int32(selectRecs[i].Y), int32(selectRecs[i].Width), int32(selectRecs[i].Height), rl.Gray)
+				rl.DrawText(processText[i], int32(selectRecs[i].X+selectRecs[i].Width/2)-rl.MeasureText(processText[i], 10)/2, int32(selectRecs[i].Y)+11, 10, rl.DarkGray)
+			}
+		}
+
+		rl.DrawTexture(texture, screenWidth-texture.Width-60, screenHeight/2-texture.Height/2, rl.White)
+		rl.DrawRectangleLines(screenWidth-texture.Width-60, screenHeight/2-texture.Height/2, texture.Width, texture.Height, rl.Black)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadTexture(texture)
+
+	rl.CloseWindow()
+}