Renderer

CRITICAL - Implement First

• Text rendering screenspace - Render text in screen coordinates for UI and debug info
• Text rendering worldspace - Render text positioned in 3D world space
• Screenspace texture rendering - Render texture in 2D screenspace
• Create fallback texture - Default texture when loading fails to prevent crashes
• Wireframe mode toggle - Switch between filled and wireframe rendering for debugging
• Change worldspace quads such that I can transform them - Add rotation support to quad instances
• Add triangle render primitives

CORE FEATURES - High Priority

• 2D primitives should be able to just set colors without making new textures
• Add normals to render primitives
• Directional light pass
• Implement depth sorting for transparency - Sort transparent objects back-to-front for correct alpha blending
• Draw worldspace circles - Render circles positioned in 3D space
• Draw screenspace circles - Render circles in screen coordinates for UI
• Draw worldspace spheres - 3D sphere rendering with proper shading
• Draw box worldspace - Wireframe or filled box rendering in 3D space
• Thicker lines - Variable width lines instead of 1-pixel GL_LINES
• Screenspace quads rounded edges - UI quads with configurable corner radius

UI/UX FEATURES - Medium Priority

• Border - Add border customization to primitives like thickness and color
• Round corners - Add round corners to quads
• Gradient fills - Linear and radial gradients for primitives rendering
• Scissor/clipping rectangles - Clip rendering to specific screen regions
• Render stats display - Show performance metrics like draw calls and instance counts

DEBUG/UTILITY - Medium Priority

• Screenspace line rendering
• Draw normals on primitives
• Grid rendering - Draw world-space grid lines for spatial reference
• Bounding box visualization - Render wireframe boxes around objects for debugging
• Draw arrow worldspace - 3D arrows with proper arrowhead geometry

ADVANCED RENDERING - Lower Priority

• Multiple render targets/framebuffers - Support for off-screen rendering and post-processing
• MSAA support - Multi-sample anti-aliasing for smoother edges
• Shadow mapping - Basic directional light shadow casting
• Bloom/glow effect - Post-processing effect for bright light sources
• Particle system - GPU-based particle rendering with instancing

PERFORMANCE - When needed

• Frustum culling - Skip rendering objects outside camera view
• Texture atlasing system - Combine multiple textures to reduce binding overhead
• GPU Timer queries - Measure GPU performance for bottleneck identification

BUGS

• Camera is janky, especially when pressing like 2, 3 or more keys at once
• Screenspace text rendering appears on a base line, is scaled by pixel height and position from the quad center
• Worldspace text rendering appears on a base line, is scaled by pixel height and position from the quad center

Game

fz_std

• Window and Input should not be globals, they should be returned to userspace on initialization.
• Put all functions definitions together and structs at the top
• Implement os_message_box
• Add os_message_box to failed asserts and emit_fatal