Free look camera 3d

game/game.odin

@@ -14,15 +14,17 @@
 
 package game
 
-import "core:math/linalg"
 import "core:fmt"
+import "core:math/linalg"
 import rl "vendor:raylib"
 
-PIXEL_WINDOW_HEIGHT :: 180
+PIXEL_WINDOW_HEIGHT :: 360
 
 Game_Memory :: struct {
-	player_pos: rl.Vector2,
-	some_number: int,
+	player_pos:       rl.Vector3,
+	camera_yaw_pitch: rl.Vector2,
+	camera_speed:     f32,
+	mouse_captured:   bool,
 }
 
 g_mem: ^Game_Memory
@@ -31,20 +33,33 @@ game_camera :: proc() -> rl.Camera2D {
 	w := f32(rl.GetScreenWidth())
 	h := f32(rl.GetScreenHeight())
 
+	return {zoom = h / PIXEL_WINDOW_HEIGHT, target = g_mem.player_pos.xy, offset = {w / 2, h / 2}}
+}
+
+camera_rotation_matrix :: proc() -> matrix[3, 3]f32 {
+	return linalg.matrix3_from_euler_angles_xy(g_mem.camera_yaw_pitch.x, g_mem.camera_yaw_pitch.y)
+}
+
+camera_forward_vec :: proc() -> rl.Vector3 {
+	rotation_matrix := camera_rotation_matrix()
+	return rotation_matrix * rl.Vector3{0, 0, 1}
+}
+
+game_camera_3d :: proc() -> rl.Camera3D {
 	return {
-		zoom = h/PIXEL_WINDOW_HEIGHT,
-		target = g_mem.player_pos,
-		offset = { w/2, h/2 },
+		position = g_mem.player_pos,
+		up = {0, 1, 0},
+		fovy = 60,
+		target = g_mem.player_pos + camera_forward_vec(),
+		projection = .PERSPECTIVE,
 	}
 }
 
 ui_camera :: proc() -> rl.Camera2D {
-	return {
-		zoom = f32(rl.GetScreenHeight())/PIXEL_WINDOW_HEIGHT,
-	}
+	return {zoom = f32(rl.GetScreenHeight()) / PIXEL_WINDOW_HEIGHT}
 }
 
-update :: proc() {
+update_free_look_camera :: proc() {
 	input: rl.Vector2
 
 	if rl.IsKeyDown(.UP) || rl.IsKeyDown(.W) {
@@ -60,24 +75,51 @@ update :: proc() {
 		input.x += 1
 	}
 
+	if rl.IsKeyPressed(.ESCAPE) {
+		if g_mem.mouse_captured {
+			g_mem.mouse_captured = false
+			rl.EnableCursor()
+		}
+	}
+
+	if g_mem.mouse_captured {
+		g_mem.camera_yaw_pitch += rl.GetMouseDelta().yx * -1 * 0.001
+	}
+
+	g_mem.camera_speed += rl.GetMouseWheelMove() * 0.01
+	g_mem.camera_speed = linalg.clamp(g_mem.camera_speed, 0.01, 10)
+
+	rotation_matrix := camera_rotation_matrix()
+	forward := -rotation_matrix[2]
+	right := linalg.cross(rl.Vector3{0, 1, 0}, forward)
+
 	input = linalg.normalize0(input)
-	g_mem.player_pos += input * rl.GetFrameTime() * 100
-	g_mem.some_number += 1
+	g_mem.player_pos += (input.x * right + input.y * forward) * g_mem.camera_speed
+}
+
+update :: proc() {
+	if rl.IsMouseButtonPressed(.LEFT) {
+		g_mem.mouse_captured = true
+		rl.DisableCursor()
+	}
+
+	update_free_look_camera()
 }
 
 draw :: proc() {
 	rl.BeginDrawing()
 	rl.ClearBackground(rl.BLACK)
 
-	rl.BeginMode2D(game_camera())
-	rl.DrawRectangleV(g_mem.player_pos, {10, 20}, rl.WHITE)
-	rl.DrawRectangleV({20, 20}, {10, 10}, rl.RED)
-	rl.DrawRectangleV({-30, -20}, {10, 10}, rl.GREEN)
-	rl.EndMode2D()
+	{
+		rl.BeginMode3D(game_camera_3d())
+		defer rl.EndMode3D()
+
+		rl.DrawBoundingBox(rl.BoundingBox{min = -1, max = 1}, {255, 0, 0, 255})
+	}
 
 	rl.BeginMode2D(ui_camera())
 	// Note: main_hot_reload.odin clears the temp allocator at end of frame.
-	rl.DrawText(fmt.ctprintf("some_number: %v\nplayer_pos: %v", g_mem.some_number, g_mem.player_pos), 5, 5, 8, rl.WHITE)
+	rl.DrawText(fmt.ctprintf("player_pos: %v", g_mem.player_pos), 5, 5, 8, rl.WHITE)
 	rl.EndMode2D()
 
 	rl.EndDrawing()
@@ -94,6 +136,7 @@ game_update :: proc() -> bool {
 game_init_window :: proc() {
 	rl.SetConfigFlags({.WINDOW_RESIZABLE, .VSYNC_HINT})
 	rl.InitWindow(1280, 720, "Odin + Raylib + Hot Reload template!")
+	rl.SetExitKey(.KEY_NULL)
 	rl.SetWindowPosition(200, 200)
 	rl.SetTargetFPS(500)
 }
@@ -102,9 +145,7 @@ game_init_window :: proc() {
 game_init :: proc() {
 	g_mem = new(Game_Memory)
 
-	g_mem^ = Game_Memory {
-		some_number = 100,
-	}
+	g_mem^ = Game_Memory{}
 
 	game_hot_reloaded(g_mem)
 }