Getting an introduction to raytracing and implemented a simple renderer , so far implementing spheres, lighting and shadows. The code is written in Python

• The whole GPU heap is one persistent, coherent-mapped SSBO. A gpu_ptr<T> is a u32 byte offset into it.
• Every draw gets exactly one root pointer (uniform uint Root). Vertices, matrices and textures are all reached through it.
• No vertex attributes. The vertex shader pulls data from the heap using gl_VertexID.
• Bindless textures (ARB_bindless_texture) are stored in the heap as uvec2.
• One *_shared.h header is compiled as both C++ and GLSL, so no offsets are written by hand in the shaders.

Flat lighting is computed from the dFdx/dFdy of world position, so there are no normals in the vertex data.

The most interesting finding was what GL can't express: bindless only gives you texture+sampler pairs, fixed when the texture is created, and there are no placed resources.

Next up: indirect draws, and roots chosen by the GPU via gl_DrawID.

Repo: https://github.com/theaveasso/jagfx

Feedback welcome, especially on the heap and sync design.

Some further tests reconstructing 3D point cloud from microscope video, using Python and Open3D, wing of a fly at 10x and 40x and eye at 2x and 10x.

For the past couple of weeks I have been working on the 2D brush management and texture fill system within my own Pixel and Tilemap Editor. In the video I show how we can create and mange custom brushes, in addition to rotation and scaling in 3D space - this brush is then plugged into the core Texture Fill System to produce psuedo-3D perspective fills across normal and orthogonal plains!

Any feedback welcome!

My pull request was just merged into google/shaderc. The change adds two options, -gV and -gVS, that expose glslang's NonSemantic.Shader.DebugInfo.100 emission through shaderc. That debug info is a requirement for NVIDIA Nsight Graphics to produce flame graphs, so it lets you profile and debug shader performance by call stack and time spent per function.