step

examples/shaders/postprocessing/main.go

@@ -0,0 +1,148 @@
+package main
+
+import (
+	"github.com/gen2brain/raylib-go/raylib"
+)
+
+const MaxPostproShaders = 12
+
+const (
+	FxGrayscale = iota
+	FxPosterization
+	FxDreamVision
+	FxPixelizer
+	FxCrossHatching
+	FxCrossStitching
+	FxPredatorView
+	FxScanlines
+	FxFisheye
+	FxSobel
+	FxBloom
+	FxBlur
+)
+
+var postproShaderText = []string{
+	"GRAYSCALE",
+	"POSTERIZATION",
+	"DREAM_VISION",
+	"PIXELIZER",
+	"CROSS_HATCHING",
+	"CROSS_STITCHING",
+	"PREDATOR_VIEW",
+	"SCANLINES",
+	"FISHEYE",
+	"SOBEL",
+	"BLOOM",
+	"BLUR",
+}
+
+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 - postprocessing shader")
+
+	camera := rl.Camera{}
+	camera.Position = rl.NewVector3(2.0, 3.0, 2.0)
+	camera.Target = rl.NewVector3(0.0, 1.0, 0.0)
+	camera.Up = rl.NewVector3(0.0, 1.0, 0.0)
+	camera.Fovy = 45.0
+
+	obj := rl.LoadModel("church.obj")                            // Load OBJ model
+	texture := rl.LoadTexture("church_diffuse.png")              // Load model texture
+	rl.SetMaterialTexture(obj.Materials, rl.MapDiffuse, texture) // Set obj model diffuse texture
+
+	position := rl.NewVector3(0.0, 0.0, 0.0) // Set model position
+
+	// Load all postpro shaders
+	// NOTE 1: All postpro shader use the base vertex shader (DEFAULT_VERTEX_SHADER)
+	shaders := make([]rl.Shader, MaxPostproShaders)
+	shaders[FxGrayscale] = rl.LoadShader("", "glsl330/grayscale.fs")
+	shaders[FxPosterization] = rl.LoadShader("", "glsl330/posterization.fs")
+	shaders[FxDreamVision] = rl.LoadShader("", "glsl330/dream_vision.fs")
+	shaders[FxPixelizer] = rl.LoadShader("", "glsl330/pixelizer.fs")
+	shaders[FxCrossHatching] = rl.LoadShader("", "glsl330/cross_hatching.fs")
+	shaders[FxCrossStitching] = rl.LoadShader("", "glsl330/cross_stitching.fs")
+	shaders[FxPredatorView] = rl.LoadShader("", "glsl330/predator.fs")
+	shaders[FxScanlines] = rl.LoadShader("", "glsl330/scanlines.fs")
+	shaders[FxFisheye] = rl.LoadShader("", "glsl330/fisheye.fs")
+	shaders[FxSobel] = rl.LoadShader("", "glsl330/sobel.fs")
+	shaders[FxBlur] = rl.LoadShader("", "glsl330/blur.fs")
+	shaders[FxBloom] = rl.LoadShader("", "glsl330/bloom.fs")
+
+	currentShader := FxGrayscale
+
+	// Create a RenderTexture2D to be used for render to texture
+	target := rl.LoadRenderTexture(screenWidth, screenHeight)
+
+	rl.SetCameraMode(camera, rl.CameraOrbital) // Set free camera mode
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+		rl.UpdateCamera(&camera) // Update camera
+
+		if rl.IsKeyPressed(rl.KeyRight) {
+			currentShader++
+		} else if rl.IsKeyPressed(rl.KeyLeft) {
+			currentShader--
+		}
+
+		if currentShader >= MaxPostproShaders {
+			currentShader = 0
+		} else if currentShader < 0 {
+			currentShader = MaxPostproShaders - 1
+		}
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginTextureMode(target) // Enable drawing to texture
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginMode3D(camera)
+
+		rl.DrawModel(obj, position, 0.1, rl.White) // Draw 3d model with texture
+
+		rl.DrawGrid(10, 1.0) // Draw a grid
+
+		rl.EndMode3D()
+
+		rl.EndTextureMode() // End drawing to texture (now we have a texture available for next passes)
+
+		// Render previously generated texture using selected postpro shader
+		rl.BeginShaderMode(shaders[currentShader])
+
+		// NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
+		rl.DrawTextureRec(target.Texture, rl.NewRectangle(0, 0, float32(target.Texture.Width), float32(-target.Texture.Height)), rl.NewVector2(0, 0), rl.White)
+
+		rl.EndShaderMode()
+
+		rl.DrawRectangle(0, 9, 580, 30, rl.Fade(rl.LightGray, 0.7))
+
+		rl.DrawText("(c) Church 3D model by Alberto Cano", screenWidth-200, screenHeight-20, 10, rl.DarkGray)
+
+		rl.DrawText("CURRENT POSTPRO SHADER:", 10, 15, 20, rl.Black)
+		rl.DrawText(postproShaderText[currentShader], 330, 15, 20, rl.Red)
+		rl.DrawText("< >", 540, 10, 30, rl.DarkBlue)
+
+		rl.DrawFPS(700, 15)
+
+		rl.EndDrawing()
+	}
+
+	// Unload all postpro shaders
+	for i := 0; i < MaxPostproShaders; i++ {
+		rl.UnloadShader(shaders[i])
+	}
+
+	rl.UnloadTexture(texture)      // Unload texture
+	rl.UnloadModel(obj)            // Unload model
+	rl.UnloadRenderTexture(target) // Unload render texture
+
+	rl.CloseWindow()
+}