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146 lines
4.2 KiB
Markdown
146 lines
4.2 KiB
Markdown
---
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category: tool
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tool: raylib
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filename: learnraylib.c
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contributors:
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- ["Nikolas Wipper", "https://notnik.cc"]
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---
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**raylib** is a cross-platform easy-to-use graphics library, built around
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OpenGL 1.1, 2.1, 3.3 and OpenGL ES 2.0. Even though it is written in C
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it has bindings to over 50 different languages. This tutorial will use C,
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more specifically C99.
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```c
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#include <raylib.h>
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int main(void)
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{
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const int screenWidth = 800;
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const int screenHeight = 450;
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// Before initialising raylib we can set configuration flags
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SetConfigFlags(FLAG_MSAA_4X_HINT | FLAG_VSYNC_HINT);
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// raylib doesn't require us to store any instance structures
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// At the moment raylib can handle only one window at a time
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InitWindow(screenWidth, screenHeight, "MyWindow");
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// Set our game to run at 60 frames-per-second
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SetTargetFPS(60);
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// Set a key that closes the window
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// Could be 0 for no key
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SetExitKey(KEY_DELETE);
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// raylib defines two types of cameras: Camera3D and Camera2D
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// Camera is a typedef for Camera3D
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Camera camera = {
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.position = {0.0f, 0.0f, 0.0f},
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.target = {0.0f, 0.0f, 1.0f},
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.up = {0.0f, 1.0f, 0.0f},
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.fovy = 70.0f,
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.type = CAMERA_PERSPECTIVE
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};
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// raylib supports loading of models, animations, images and sounds
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// from various different file formats
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Model myModel = LoadModel("my_model.obj");
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Font someFont = LoadFont("some_font.ttf");
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// Creates a 100x100 render texture
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RenderTexture renderTexture = LoadRenderTexture(100, 100);
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// WindowShouldClose checks if the user is closing the window
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// This might happen using a shortcut, window controls
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// or the key we set earlier
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while (!WindowShouldClose())
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{
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// BeginDrawing needs to be called before any draw call
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BeginDrawing();
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{
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// Sets the background to a certain color
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ClearBackground(BLACK);
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if (IsKeyDown(KEY_SPACE))
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DrawCircle(400, 400, 30, GREEN);
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// Simple draw text
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DrawText("Congrats! You created your first window!",
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190, // x
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200, // y
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20, // font size
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LIGHTGRAY
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);
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// For most functions there are several versions
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// These are usually postfixed with Ex, Pro, V
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// or sometimes Rec, Wires (only for 3D), Lines (only for 2D)
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DrawTextEx(someFont,
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"Text in another font",
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(Vector2) {10, 10},
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20, // font size
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2, // spacing
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LIGHTGRAY);
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// Required for drawing 3D, has 2D equivalent
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BeginMode3D(camera);
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{
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DrawCube((Vector3) {0.0f, 0.0f, 3.0f},
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1.0f, 1.0f, 1.0f, RED);
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// White tint when drawing will keep the original color
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DrawModel(myModel, (Vector3) {0.0f, 0.0f, 3.0f},
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1.0f, //Scale
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WHITE);
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}
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// End 3D mode so we can draw normally again
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EndMode3D();
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// Start drawing onto render texture
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BeginTextureMode(renderTexture);
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{
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// It behaves the same as if we just called `BeginDrawing()`
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ClearBackground(RAYWHITE);
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BeginMode3D(camera);
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{
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DrawGrid(10, // Slices
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1.0f // Spacing
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);
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}
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EndMode3D();
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}
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EndTextureMode();
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// render textures have a Texture2D field
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DrawTexture(renderTexture.texture, 40, 378, BLUE);
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}
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EndDrawing();
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}
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// Unloading loaded objects
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UnloadFont(someFont);
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UnloadModel(myModel);
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// Close window and OpenGL context
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CloseWindow();
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return 0;
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}
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```
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## Further reading
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raylib has some [great examples](https://www.raylib.com/examples.html)
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If you don't like C check out the [raylib bindings](https://github.com/raysan5/raylib/blob/master/BINDINGS.md) |