updated light.go added basic lighting example

examples/shaders/basic_lighting/main.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(1280)
+	screenHeight := int32(720)
+
+	rl.SetConfigFlags(rl.FlagMsaa4xHint) //ENABLE 4X MSAA IF AVAILABLE
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - basic lighting")
+
+	camera := rl.Camera{}
+	camera.Position = rl.NewVector3(2.0, 4.0, 6.0)
+	camera.Target = rl.NewVector3(0.0, 0.5, 0.0)
+	camera.Up = rl.NewVector3(0.0, 1.0, 0.0)
+	camera.Fovy = 45.0
+	camera.Projection = rl.CameraPerspective
+
+	ground := rl.LoadModelFromMesh(rl.GenMeshPlane(10, 10, 3, 3))
+	cube := rl.LoadModelFromMesh(rl.GenMeshCube(2, 4, 2))
+
+	shader := rl.LoadShader("lighting.vs", "lighting.fs")
+
+	*shader.Locs = rl.GetShaderLocation(shader, "viewPos")
+
+	ambientLoc := rl.GetShaderLocation(shader, "ambient")
+	shaderValue := []float32{0.1, 0.1, 0.1, 1.0}
+	rl.SetShaderValue(shader, ambientLoc, shaderValue, rl.ShaderUniformVec4)
+
+	ground.Materials.Shader = shader
+	cube.Materials.Shader = shader
+
+	lights := make([]Light, 4)
+	lights[0] = NewLight(LightTypePoint, rl.NewVector3(-2, 1, -2), rl.NewVector3(0, 0, 0), rl.Yellow, shader)
+
+	lights[1] = NewLight(LightTypePoint, rl.NewVector3(2, 1, 2), rl.NewVector3(0, 0, 0), rl.Red, shader)
+
+	lights[2] = NewLight(LightTypePoint, rl.NewVector3(-2, 1, 2), rl.NewVector3(0, 0, 0), rl.Green, shader)
+
+	lights[3] = NewLight(LightTypePoint, rl.NewVector3(2, 1, -2), rl.NewVector3(0, 0, 0), rl.Blue, shader)
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+		rl.UpdateCamera(&camera, rl.CameraOrbital)
+
+		cameraPos := []float32{camera.Position.X, camera.Position.Y, camera.Position.Z}
+		rl.SetShaderValue(shader, *shader.Locs, cameraPos, rl.ShaderUniformVec3)
+
+		if rl.IsKeyPressed(rl.KeyY) {
+			lights[0].enabled *= -1
+		}
+		if rl.IsKeyPressed(rl.KeyR) {
+			lights[1].enabled *= -1
+		}
+		if rl.IsKeyPressed(rl.KeyG) {
+			lights[2].enabled *= -1
+		}
+		if rl.IsKeyPressed(rl.KeyB) {
+			lights[3].enabled *= -1
+		}
+
+		for i := 0; i < len(lights); i++ {
+			lights[i].UpdateValues()
+		}
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginMode3D(camera)
+
+		rl.DrawModel(ground, rl.NewVector3(0, 0, 0), 1, rl.White)
+		rl.DrawModel(cube, rl.NewVector3(0, 0, 0), 1, rl.White)
+
+		for i := 0; i < len(lights); i++ {
+			if lights[i].enabled == 1 {
+				rl.DrawSphereEx(lights[i].position, 0.2, 8, 8, lights[i].color)
+			} else {
+				rl.DrawSphereWires(lights[i].position, 0.2, 8, 8, rl.Fade(lights[i].color, 0.3))
+			}
+		}
+
+		rl.DrawGrid(10, 1.0) // Draw a grid
+
+		rl.EndMode3D()
+
+		rl.DrawFPS(10, 10)
+
+		rl.DrawText("KEYS [Y] [R] [G] [B] TURN LIGHTS ON/OFF", 10, 40, 20, rl.Black)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadShader(shader) // Unload shader
+	rl.UnloadModel(cube)    // Unload model
+	rl.UnloadModel(ground)  // Unload model
+
+	rl.CloseWindow()
+}