Yes, you can build a small game engine in C. The practical definition of “from scratch” is writing the engine’s architecture and game-facing systems yourself while using proven libraries for windows, input, audio, graphics contexts, and file formats. For a first project, use C, CMake, SDL3, and OpenGL to make one focused 2D game or simple 3D prototype. Writing every operating-system and codec layer yourself is a separate systems-programming research project, not a sensible beginner engine plan.
Decide what “from scratch” means
There are three useful levels:
Engine architecture from scratch
You write the game loop, entities, transforms, scenes, resource handles, renderer API, collision integration, serialization conventions, diagnostics, and project structure. SDL3 or GLFW supplies platform plumbing. This is the recommended level.
Renderer from scratch
You implement a rendering layer directly against OpenGL, Vulkan, or another graphics API after the application lifecycle and resource model are working.
Everything from scratch
You also write window creation, OS event handling, image decoders, audio codecs, GPU integration, and tooling. That is valuable platform research but an impractical route to a first playable game.
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Choose a finishable first scope
Start with one small game: Breakout, Asteroids, a top-down shooter, a tile-based platformer, or a particle sandbox. A credible first engine release can provide one window, keyboard and mouse input, fixed-timestep simulation, sprites, textures, basic collision, audio, a camera, a small scene system, explicit asset paths, logging, and frame timing.
Defer these features
- General-purpose editors and visual node graphs
- Multiplayer networking and console deployment
- Skeletal animation and physically based rendering
- A custom scripting language or hot-reloadable native code
- A fully generic ECS, custom physics engine, or Vulkan ray tracing
Set a stopping rule: finish one complete game loop before adding another subsystem.
What an engine actually contains
An engine coordinates more than drawing:
Platform
├── Window
├── Input
├── Audio
├── Timing
└── Filesystem
Core
├── Memory, logging, math, containers, resource handles
Gameplay
├── Entities, components, systems, scenes, game states
Rendering
├── Camera, textures, meshes, materials, batches, debug drawing
Tools
├── Asset conversion, validation, profiling, packagingThe abstraction earns its cost only when game code becomes simpler than direct library calls.
Why C works—and where it hurts
Strengths
- Explicit allocation and ownership
- Predictable data layout and a small language surface
- Excellent interoperability with C libraries
- Straightforward targets for GCC, Clang, and MSVC
- A natural fit for procedural and data-oriented systems
Costs
- No namespaces, overloading, automatic destruction, or standard dynamic-array and hash-map types
- More manual error handling and boilerplate for ownership and polymorphism
- Greater exposure to lifetime, aliasing, buffer, and use-after-free bugs
C gives control and predictable ownership; it does not automatically make a program faster than C++ or Rust. Algorithms, data layout, compiler choices, and API usage determine performance.
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Choose the stack
| Layer | Recommended first choice | Alternative and trade-off |
|---|---|---|
| Language | C | Keep the language stable while learning architecture. |
| Build | CMake | Cross-platform configuration and dependency integration. |
| Platform | SDL3 | Broad multimedia scope: windowing, input, audio, filesystem and threading support. See SDL3’s CMake guide. |
| Platform alternative | GLFW | Narrower window, context, input, and event layer for OpenGL, OpenGL ES, and Vulkan: official documentation. |
| Renderer | OpenGL | Short path to 2D or modest 3D results. |
| Explicit graphics | Vulkan | Use when learning synchronization, resource binding, and GPU memory is the primary goal. The official engine series is architectural reference material and uses modern C++20 and Vulkan RAII: Vulkan engine introduction. |
SDL3 or GLFW?
Choose SDL3 when you want one foundation for games, including controller and audio work. Choose GLFW when you want the smallest possible window/context/input layer and will select audio and other systems separately. GLFW’s lifecycle is documented in its quick guide.
Create a reproducible CMake project
Keep the game executable separate from the engine library:
myengine/
├── CMakeLists.txt
├── assets/
├── engine/include/engine/
├── engine/src/
├── game/main.c
├── tools/
├── tests/
├── third_party/
└── build/SDL’s documented vendored workflow is:
git clone https://github.com/libsdl-org/SDL.git vendored/SDL
cmake -S . -B build
cmake --build buildA minimal target is:
cmake_minimum_required(VERSION 3.16)
project(mygame C)
add_subdirectory(vendored/SDL EXCLUDE_FROM_ALL)
add_executable(mygame game/main.c)
target_link_libraries(mygame PRIVATE SDL3::SDL3)The 3.16 value is the minimum used by SDL’s example, not a promise that every feature or toolchain has identical requirements; check the current dependency documentation when reproducing a build. On Visual Studio, multi-configuration builds commonly place binaries in build/Debug or build/Release. SDL documents a Windows post-build pattern for copying its shared library beside the executable at README-windows.
For an installed GLFW package, its documentation shows:
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target_link_libraries(myapp glfw OpenGL::GL)On Unix-like systems, GLFW also documents:
cc $(pkg-config --cflags glfw3 gl) -o myprog myprog.c $(pkg-config --libs glfw3 gl)Those commands come from GLFW’s build guide.
Build the platform layer first
Keep SDL or GLFW calls out of gameplay code. Expose engine-facing state instead:
typedef struct EngineInput {
bool key_down[ENGINE_KEY_COUNT];
bool key_pressed[ENGINE_KEY_COUNT];
bool key_released[ENGINE_KEY_COUNT];
float mouse_x, mouse_y, mouse_dx, mouse_dy;
} EngineInput;
bool platform_init(int width, int height, const char *title);
void platform_poll_events(EngineInput *input);
void platform_present(void);
void platform_shutdown(void);The platform module should own window creation, event polling, controller state, timing, audio-device setup, and native handles needed by a backend.
Use a correct application loop
Variable timestep for the first visual prototype
while (!platform_should_quit()) {
double now = platform_time_seconds();
float dt = (float)(now - previous);
previous = now;
platform_poll_events(&input);
game_update(&game, dt);
game_render(&game);
platform_present();
}This is easy to understand but can produce frame-rate-dependent physics.
Fixed timestep for simulation
const double fixed_dt = 1.0 / 60.0;
double previous = platform_time_seconds();
double accumulator = 0.0;
while (!platform_should_quit()) {
double current = platform_time_seconds();
double frame_time = current - previous;
previous = current;
if (frame_time > 0.25) frame_time = 0.25;
accumulator += frame_time;
platform_poll_events(&input);
while (accumulator >= fixed_dt) {
game_fixed_update(&game, &input, (float)fixed_dt);
accumulator -= fixed_dt;
}
game_render_interpolated(&game, (float)(accumulator / fixed_dt));
platform_present();
}- Clamp long pauses caused by a debugger or a stalled window.
- Clear pressed and released flags once per render frame.
- Decide explicitly whether input is sampled per render frame or simulation step.
- Define pause behavior and avoid an unlimited catch-up loop.
Make ownership explicit
For every subsystem, document who allocates and frees an object, whether a pointer is borrowed, whether storage can move, what happens after deletion, and which failures return NULL.
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typedef struct Texture Texture;
Texture *texture_create(const char *path);
void texture_destroy(Texture *texture);
typedef uint32_t TextureHandle;
TextureHandle renderer_load_texture(Renderer *renderer, const char *path);
void renderer_release_texture(Renderer *renderer, TextureHandle texture);Opaque handles are safer when resources may move or be reloaded. Separate policies for long-lived state, per-level state, per-frame scratch data, assets, and debug allocations. A linear arena can make temporary lifetimes obvious:
typedef struct Arena {
unsigned char *memory;
size_t capacity, offset;
} Arena;
void *arena_alloc(Arena *arena, size_t size, size_t alignment);
void arena_reset(Arena *arena);Use a custom allocator to clarify lifetime, not as performance theater.
Keep the core small
Initial modules can include fixed-width types, assertions, logging, result conventions, dynamic arrays, hash tables, string views, arenas, vectors, matrices, rectangles, file helpers, and time conversion. Organize by responsibility rather than creating one giant utility header.
Write one renderer before abstracting many backends
With SDL or GLFW creating the context, an OpenGL renderer can progress from clearing the screen to a textured quad, then sprites, batching, and camera transforms:
typedef struct Renderer Renderer;
bool renderer_init(Renderer *renderer, Platform *platform);
void renderer_begin_frame(Renderer *renderer);
void renderer_draw_sprite(Renderer *renderer, TextureHandle texture,
Rect source, Vec2 position, Vec2 size, Color color);
void renderer_end_frame(Renderer *renderer);
void renderer_shutdown(Renderer *renderer);Handle shader compilation, vertex buffers, texture lifetime, coordinate orientation, resizing, high-DPI drawable size, alpha convention, batch overflow, and transparent-object ordering. Add a backend interface only after one real renderer reveals a need for it.
When Vulkan is justified
Vulkan is appropriate when explicit command buffers, synchronization, descriptor-style binding, and GPU memory management are the learning objective. It is a poor first choice when the goal is to complete a playable game quickly. The Vulkan documentation’s architecture chapter discusses resource management and engine structure at Engine Architecture.
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Choose data structures before an ECS
Start with direct structures:
typedef struct Player {
Vec2 position;
Vec2 velocity;
float health;
} Player;Introduce entities and components when many object types and repeated iteration make direct structures limiting:
typedef struct EntityId {
uint32_t index;
uint32_t generation;
} EntityId;
typedef struct Transform { Vec2 position; float rotation; Vec2 scale; } Transform;
typedef struct Velocity { Vec2 value; } Velocity;An ECS can improve iteration over homogeneous data, but adds indirection, deletion rules, and debugging cost. Generation counters prevent stale IDs from becoming valid references to newly reused slots.
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Separate source files, import or conversion, engine-friendly runtime formats, and runtime loading:
Source asset → importer/converter → runtime format → loader → CPU/GPU resourceTrack asset paths, identifiers, CPU data, GPU resources, ownership or reference counts, loading failures, and reload state. Resolve paths from an explicit project or asset root; do not depend on the process working directory. Account for missing files, case-sensitive paths, corrupt formats, duplicate loads, premature unloads, and shader compilation errors.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Add collision, audio, and diagnostics incrementally
Collision
- Axis-aligned bounding boxes
- Circle overlap and point queries
- Broad-phase partitioning
- Collision response
- Constraints only when the game requires them
Detection is not response. Discrete tests can tunnel at high speed, floating-point tolerances matter, and update order changes results. Keep physics on a fixed timestep and define whether transforms or physics bodies are authoritative.
Audio and UI
Add audio after the loop and resource ownership are stable. A debug overlay should arrive before editor features.
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Diagnostics
- Assertions and structured log files
- Sanitizer-enabled debug builds where your compiler supports them
- Frame time, draw-call, resource, entity, and arena-usage counters
- Collision and render debug modes
- Centralized shader and asset error messages
These tools reduce the cost of every later debugging session.
Recover from common failures
The window opens but nothing renders
- Verify context creation and that the correct context is current.
- Match the viewport to the drawable framebuffer size, including high-DPI displays.
- Log shader compile and link results.
- Confirm vertex uploads, draw-call reachability, and a visible clear color.
- Call present or swap and check graphics errors immediately after setup calls.
It works in the IDE but not from a terminal
Print the executable path, working directory, and resolved asset path. Check architecture, compiler, environment variables, and debug versus release configuration. Copy required shared libraries beside the executable; SDL’s Windows guidance is at README-windows.
Game speed changes with frame rate
Use fixed-step simulation, multiply time-dependent movement by dt, and clamp unusually large frame times.
Entities disappear or mutate randomly
Suspect pointers invalidated by dynamic-array growth, swap-removal references, reused indices, double frees, or components outliving entities. Prefer handles with generation counters, debug validity checks, and deferred destruction.
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The engine is harder to use than the game
Remove abstractions that lack a second real use. Keep one backend, expose a small public API, and let concrete game features drive generalization.
Test, profile, and package
Unit-test math, containers, and collision independently. Add reproducible input or simulation replay for difficult bugs. Measure frame time by subsystem, memory allocations, draw calls, loaded resources, and batch usage. Package the game with its asset root and runtime libraries rather than assuming the developer’s machine layout.
When not to build your own engine
Use an established engine when shipping a game quickly matters more than implementing engine systems, when an editor is an immediate requirement, when multiplayer, animation, or broad platform deployment dominates the project, or when C fundamentals are not yet comfortable. Build in C when systems programming, graphics, ownership, and architecture are themselves the product.
Development tools and cost
The core stack—CMake, SDL3 or GLFW, a C compiler, and debugger—does not require a paid purchase.
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- Cross-platform IDE: CLion lists free non-commercial use and commercial individual pricing of approximately $10.90 per month on the page observed August 18, 2026; annual and trial terms can change. See CLion buying page.
- Commercial licenses: Choose paid CLion or Visual Studio Professional only when organizational policy, support, or workflow needs justify the cost. Verify current terms at CLion and Microsoft licensing guidance.
The Bottom Line
For a first serious project, build one small game with C, CMake, SDL3, and OpenGL. Write the lifecycle, loop, ownership model, renderer API, resources, gameplay structures, and diagnostics yourself; borrow platform and format plumbing from mature libraries. Move to Vulkan, ECS generalization, editors, and custom physics only when a finished game demonstrates the need.
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