add example

examples/core/core_split_screen/main.go

@@ -0,0 +1,144 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+/*******************************************************************************************
+*
+*   raylib [core] example - split screen
+*
+*   Example originally created with raylib 3.7, last time updated with raylib 4.0
+*
+*   Example contributed by Jeffery Myers (@JeffM2501) and reviewed by Ramon Santamaria (@raysan5)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2021-2022 Jeffery Myers (@JeffM2501)
+*
+********************************************************************************************/
+
+var cameraPlayer1 rl.Camera
+var cameraPlayer2 rl.Camera
+
+// Scene drawing
+func DrawScene() {
+	count := float32(5.0)
+	spacing := float32(4.0)
+
+	// Grid of cube trees on a plane to make a "world"
+	rl.DrawPlane(rl.Vector3{0, 0, 0}, rl.Vector2{50, 50}, rl.Beige) // Simple world plane
+
+	for x := -float32(count * spacing); x <= count*spacing; x += spacing {
+		for z :=-float32(count * spacing); z <= count*spacing; z += spacing {
+			rl.DrawCube(rl.Vector3{x, 1.5, z}, 1, 1, 1, rl.Lime)
+			rl.DrawCube(rl.Vector3{x, 0.5, z}, 0.25, 1, 0.25, rl.Brown)
+		}
+	}
+
+	// Draw a cube at each player's position
+	rl.DrawCube(cameraPlayer1.Position, 1, 1, 1, rl.Red)
+	rl.DrawCube(cameraPlayer2.Position, 1, 1, 1, rl.Blue)
+}
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+func main() {
+	// Initialization
+	//--------------------------------------------------------------------------------------
+	const (
+		screenWidth  = 800
+		screenHeight = 450
+	)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [core] example - split screen")
+
+	// Setup player 1 camera and screen
+	cameraPlayer1.Fovy = 45.0
+	cameraPlayer1.Up.Y = 1.0
+	cameraPlayer1.Target.Y = 1.0
+	cameraPlayer1.Position.Z = -3.0
+	cameraPlayer1.Position.Y = 1.0
+
+	screenPlayer1 := rl.LoadRenderTexture(screenWidth/2, screenHeight)
+
+	// Setup player two camera and screen
+	cameraPlayer2.Fovy = 45.0
+	cameraPlayer2.Up.Y = 1.0
+	cameraPlayer2.Target.Y = 3.0
+	cameraPlayer2.Position.X = -3.0
+	cameraPlayer2.Position.Y = 3.0
+
+	screenPlayer2 := rl.LoadRenderTexture(screenWidth/2, screenHeight)
+
+	// Build a flipped rectangle the size of the split view to use for drawing later
+	splitScreenRect := rl.Rectangle{0.0, 0.0, float32(screenPlayer1.Texture.Width), float32(-screenPlayer1.Texture.Height)}
+
+	rl.SetTargetFPS(60) // Set our game to run at 60 frames-per-second
+	//--------------------------------------------------------------------------------------
+
+	// Main game loop
+	for !rl.WindowShouldClose() { // Detect window close button or ESC key
+		// Update
+		//----------------------------------------------------------------------------------
+		// If anyone moves this frame, how far will they move based on the time since the last frame
+		// this moves thigns at 10 world units per second, regardless of the actual FPS
+		offsetThisFrame := 10.0 * rl.GetFrameTime()
+
+		// Move Player1 forward and backwards (no turning)
+		if rl.IsKeyDown(rl.KeyW) {
+			cameraPlayer1.Position.Z += offsetThisFrame
+			cameraPlayer1.Target.Z += offsetThisFrame
+		} else if rl.IsKeyDown(rl.KeyS) {
+			cameraPlayer1.Position.Z -= offsetThisFrame
+			cameraPlayer1.Target.Z -= offsetThisFrame
+		}
+
+		// Move Player2 forward and backwards (no turning)
+		if rl.IsKeyDown(rl.KeyUp) {
+			cameraPlayer2.Position.X += offsetThisFrame
+			cameraPlayer2.Target.X += offsetThisFrame
+		} else if rl.IsKeyDown(rl.KeyDown) {
+			cameraPlayer2.Position.X -= offsetThisFrame
+			cameraPlayer2.Target.X -= offsetThisFrame
+		}
+		//----------------------------------------------------------------------------------
+
+		// Draw
+		//----------------------------------------------------------------------------------
+		// Draw Player1 view to the render texture
+		rl.BeginTextureMode(screenPlayer1)
+		rl.ClearBackground(rl.SkyBlue)
+		rl.BeginMode3D(cameraPlayer1)
+		DrawScene()
+		rl.EndMode3D()
+		rl.DrawText("PLAYER1 W/S to move", 10, 10, 20, rl.Red)
+		rl.EndTextureMode()
+
+		// Draw Player2 view to the render texture
+		rl.BeginTextureMode(screenPlayer2)
+		rl.ClearBackground(rl.SkyBlue)
+		rl.BeginMode3D(cameraPlayer2)
+		DrawScene()
+		rl.EndMode3D()
+		rl.DrawText("PLAYER2 UP/DOWN to move", 10, 10, 20, rl.Blue)
+		rl.EndTextureMode()
+
+		// Draw both views render textures to the screen side by side
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.Black)
+		rl.DrawTextureRec(screenPlayer1.Texture, splitScreenRect, rl.Vector2{0, 0}, rl.White)
+		rl.DrawTextureRec(screenPlayer2.Texture, splitScreenRect, rl.Vector2{screenWidth / 2.0, 0}, rl.White)
+		rl.EndDrawing()
+	}
+
+	// De-Initialization
+	//--------------------------------------------------------------------------------------
+	rl.UnloadRenderTexture(screenPlayer1) // Unload render texture
+	rl.UnloadRenderTexture(screenPlayer2) // Unload render texture
+
+	rl.CloseWindow() // Close window and OpenGL context
+	//--------------------------------------------------------------------------------------
+}