Software Triangle Rasterizer (Kiwi)

Kiwi is a software triangle rasterizer I built in C++. The rasterizer supports textured triangles with depth interpolation, and a top left filling rule. The code for this project can be found at https://github.com/Ihaa21/Kiwi-Software-Rasterizer/tree/master/code. The Kiwi renderer works in 2 stages:

Vertex Processing:

The renderer begins with a vertex shader stage where every vertex gets transformed into pixel coordinates. At this stage, data such as Z and UV are setup to be interpolated during rasterization. The vertices are also sorted into counter clockwise winding.

Rasterization and Fragment Processing:

Afterwards, Kiwi loops through every triangle and performs triangle discarding tests, as well as screen clipping. I calculate a minimum bounding box around the triangle and begin rasterizing the triangle. Once the program encounters a pixel that is within the triangle, Kiwi performs a depth test, interpolates the triangles Z and UV values, samples the triangles texture, and renders the pixel onto the screen. The results of this method can be seen below: