PBR Software Renderer

TODO: nice description

Features

• GLB(glTF) parser
  • JSON parser
  • PNG parser with DEFLATE decoder
  • Multi threaded parsing of texture materials

References

The references are pretty much the same ones listed in the Phong Software Renderer and can be found here.

Code flow

the below diagram shows how the execution of the program flows

%%{init: { 'theme':'forest' } }%%
sequenceDiagram
    autonumber
    main ->>+ renderer: renderer_new
    
    renderer ->>+ framebuffer: framebuffer_new
    framebuffer -->>- renderer: return

    renderer ->>+ depthbuffer: depthbuffer_new
    depthbuffer -->>- renderer: return

    renderer ->>+ file_parser: parse_scene 
    file_parser -->>- renderer: return

    renderer -->>- main: return

    main ->>+ renderer: renderer_run

    loop render loop

        renderer ->>+ display: handle_input
        display -->>- renderer: return

        loop for each model

            renderer ->>+ vertex_processor: vertex_processor_process
            note over vertex_processor, renderer: split triangles in buckets and process in parallel
            vertex_processor -->>- renderer: wait for threads to finish

            renderer ->>+ vertex_processor: vertex_processor_combine
            note over vertex_processor, renderer: note: measure if parallel process + combine is faster than sequential processing
            vertex_processor -->>- renderer: return

            renderer ->>+ fragment_processor: fragment_processor_process
            note over renderer, fragment_processor: process in parallel
            note over renderer, fragment_processor: each thread iterates over the render buffer
            note over renderer, fragment_processor: and renders only the triangles that are within its AABB
            fragment_processor -->>- renderer: wait for threads to finish

        end

        renderer ->>+ display: display_draw
        display -->>- renderer: return

    end

    renderer -->>- main: return

    main ->>+ renderer: renderer_free
    renderer -->>- main: return

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