VeldridRaylib - Raylib API Implementation using Veldrid

A C# implementation of the core raylib API using Veldrid as the graphics backend. This project provides a familiar raylib-style interface for 2D graphics programming while leveraging Veldrid's modern, cross-platform graphics capabilities.

Features

Core Window Management

• InitWindow(width, height, title) - Initialize graphics window
• WindowShouldClose() - Check if window should close
• CloseWindow() - Close window and cleanup resources
• SetTargetFPS(fps) - Set target frames per second

Drawing Functions

• BeginDrawing() / EndDrawing() - Begin/end drawing frame
• ClearBackground(color) - Clear screen with specified color

Shape Drawing

• DrawRectangle(x, y, width, height, color) - Draw rectangle
• DrawRectangleRec(rectangle, color) - Draw rectangle from Rectangle struct
• DrawCircle(centerX, centerY, radius, color) - Draw circle
• DrawCircleV(center, radius, color) - Draw circle from Vector2
• DrawLine(startX, startY, endX, endY, color) - Draw line
• DrawLineV(startPos, endPos, color) - Draw line from Vector2s
• DrawPixel(x, y, color) - Draw single pixel

Text Rendering (Basic)

• DrawText(text, x, y, fontSize, color) - Draw text (placeholder implementation)
• MeasureText(text, fontSize) - Measure text width

Input Handling

• IsKeyPressed(key) - Check if key was just pressed
• IsKeyDown(key) - Check if key is currently held down
• IsKeyReleased(key) - Check if key was just released
• IsKeyUp(key) - Check if key is not pressed
• GetMousePosition() - Get current mouse position

Utility Functions

• GetScreenWidth() / GetScreenHeight() - Get screen dimensions
• GetFrameTime() - Get time for last frame
• GetFPS() - Get current FPS

Dependencies

• Veldrid (4.9.0) - Modern graphics API abstraction
• Veldrid.StartupUtilities (4.9.0) - Window and graphics device creation helpers
• Veldrid.SDL2 (4.9.0) - SDL2 backend for windowing
• System.Numerics.Vectors (4.5.0) - Vector math support

Building and Running

dotnet restore
dotnet build
dotnet run

Example Usage

using VeldridRaylib;

// Initialize window
Raylib.InitWindow(800, 450, "My Game");
Raylib.SetTargetFPS(60);

// Main game loop
while (!Raylib.WindowShouldClose())
{
    // Update game logic here
    
    Raylib.BeginDrawing();
    
    Raylib.ClearBackground(Color.DarkGray);
    Raylib.DrawRectangle(100, 100, 200, 150, Color.Red);
    Raylib.DrawCircle(400, 200, 50, Color.Blue);
    Raylib.DrawText("Hello World!", 10, 10, 20, Color.White);
    
    Raylib.EndDrawing();
}

Raylib.CloseWindow();

Architecture

The implementation consists of several key components:

• Raylib.cs - Main API interface matching raylib's function signatures
• Renderer.cs - Core 2D renderer using Veldrid's graphics pipeline
• Shader.cs - Basic vertex/fragment shaders for 2D rendering
• Color.cs - Color structure with predefined colors
• Vector2.cs - 2D vector and rectangle structures

Current Limitations

• Text rendering is placeholder (no actual font rendering)
• Mouse button input is not fully implemented
• No texture/image loading support
• No audio support
• Limited to basic 2D shapes and primitives

Future Enhancements

• Full text rendering with font support
• Texture and sprite rendering
• Audio system integration
• More advanced shape drawing (polygons, bezier curves)
• Performance optimizations
• Additional input handling features