software_rasterizer/README.md

Things to do:

• Drawing triangles
• Drawing cubes and lines for testing
• Y up coordinate system, left handed
• Drawing a cube with perspective
• Culling triangles facing away from camera
• Texture mapping
• Basic linear transformations - rotation, translation, scaling
• Bilinear filtering of textures / subpixel precison
• Nearest filtering
• Fix the gaps between triangles (it also improved look of triangle edges)
• Perspective matrix vs simple perspective
• Perspective correct interpolation
• Depth buffer
• Gamma correct blending - converting to almost linear space
• Alpha blending??
• Premultiplied alpha???
• Merge with base
• Lightning
  • GLOBAL Ilumination
• LookAt Camera
• FPS Camera
• Reading OBJ models
• Reading OBJ .mtl files
• Reading complex obj models (sponza)
• Reading PMX files
• Rendering multiple objects, queue renderer
• Clipping
  • Triagnle rectangle bound clipping
  • A way of culling Z out triangles
    • Simple test z clipping
    • Maybe should clip a triangle on znear zfar plane?
    • Maybe should clip out triangles that are fully z out before draw_triangle
• Subpixel precision of triangle edges
• Simple profiling tooling
• Statistics based on profiler data, distribution information
• Find cool profilers - ExtraSleepy, Vtune
• Optimizations
  • Inline edge function
  • Edge function to integer
  • Use integer bit operations to figure out if plus. (edge1|edge2|edge3)>=0
• SIMD
• Multithreading
• Text rendering
• Basic UI
• Gamma correct and alpha blending

Resources that helped me build the rasterizer (Might be helpful to you too):

• Algorithm I used for triangle rasterization by Juan Pineda: https://www.cs.drexel.edu/~david/Classes/Papers/comp175-06-pineda.pdf
• Fabian Giessen's "Optimizing Software Occlusion Culling": https://fgiesen.wordpress.com/2013/02/17/optimizing-sw-occlusion-culling-index/
• Fabian Giessen's optimized software renderer: https://github.com/rygorous/intel_occlusion_cull/tree/blog/SoftwareOcclusionCulling
• Fabian Giessen's javascript triangle rasterizer: https://gist.github.com/rygorous/2486101
• Fabian Giessen's C++ triangle rasterizer: https://github.com/rygorous/trirast/blob/master/main.cpp
• Joy's Kenneth lectures about computer graphics: https://www.youtube.com/playlist?list=PL_w_qWAQZtAZhtzPI5pkAtcUVgmzdAP8g
• Joy's Kenneth article on clipping: https://import.cdn.thinkific.com/167815/JoyKennethClipping-200905-175314.pdf
• A bunch of helpful notes and links to resources: https://nlguillemot.wordpress.com/2016/07/10/rasterizer-notes/
• Very nice paid course on making a software rasterizer using a scanline method: https://pikuma.com/courses/learn-3d-computer-graphics-programming
• Reference for obj loader: https://github.com/tinyobjloader/tinyobjloader/blob/master/tiny_obj_loader.h

To read

• http://ce-publications.et.tudelft.nl/publications/1362_hardware_algorithms_for_tilebased_realtime_rendering.pdf