Note: As outlined in https://lists.qt-project.org/pipermail/development/2019-April/035551.html this repo is superceded by the upcoming integration into Qt. https://codereview.qt-project.org/#/c/256713/, once merged, will introduce QRhi into qtbase as a private API. The shader conditioning bits live in a qt-labs repo (https://codereview.qt-project.org/gitweb?p=qt-labs%2Fqtshadertools.git;a=summary) for the time being.

Experiments for a Rendering Hardware Interface abstraction for future Qt (QtRhi)

The API and its backends (Vulkan, OpenGL (ES) 2.0, Direct3D 11, Metal) are reasonably complete in the sense that it should be possible to bring up a Qt Quick renderer on top of them (using Vulkan-style GLSL as the "common" shading language - translation seems to work pretty well for now, including to HLSL and MSL). Other than that this is highly experimental with a long todo list, and the API will change in arbitrary ways. It nonetheless shows what a possible future direction for the Qt graphics stack could be.

Experiments for more modern graphics shader management in future Qt (QtShaderTools)

Uses https://github.com/KhronosGroup/SPIRV-Cross and https://github.com/KhronosGroup/glslang

QShaderBaker: Compile (Vulkan-flavor) GLSL to SPIR-V. Generate reflection info. Translate to HLSL, MSL, and various GLSL versions. Optionally rewrite vertex shaders to make them suitable for Qt Quick scenegraph batching. Pack all this into conveniently (de)serializable QBakedShader instances. Complemented by a command-line tool (qsb) to allow doing the expensive work offline. This optionally allows invoking fxc or metal/metallib to include compiled bytecode for HLSL and MSL as well.

Picture

Documentation

Generated docs are now online at https://alpqr.github.io

In action

Needs Qt 5.12. Tested on Windows 10 with MSVC2015 and 2017, and macOS 10.14 with XCode 10.

Screenshots from the test application demonstrating basic drawing, pipeline state (blending, depth), indexed drawing, texturing, and rendering into a texture. All using the same code and the same two sets of vertex and fragment shaders, with the only difference being in the QWindow setup.

Additionally, check https://github.com/alpqr/qvk6/blob/master/examples/rhi/hellominimalcrossgfxtriangle/hellominimalcrossgfxtriangle.cpp for a single-source, cross-API example of drawing a triangle.