Crossplatform 3d engine. (work in progress)

Tempest is an open-source, simple, cross-platform graphics engine written in modern C++17.
Main idea behind this engine is to provide a low-level GPU-programming concepts, like Ubo, Vbo, Ssbo, in convenient C++ packaging, with RAII, types and templates.

Features

• Multiplatform (Windows, Linux, 32bit and 64bit)
• Multibackend (Vulkan 1.0, DirectX12)
• Multithreaded command buffers and thread safety
• Build-in 2d graphics support
• Build-in UI library

Examples

// offscreen render
VulkanApi api;
Device    device(api);

static const Vertex   vboData[3] = {{-1,-1},{1,-1},{1,1}};
static const uint16_t iboData[3] = {0,1,2};

auto vbo  = device.vbo(vboData,3);
auto ibo  = device.ibo(iboData,3);

auto vert = device.shader("shader/simple_test.vert.sprv");
auto frag = device.shader("shader/simple_test.frag.sprv");
auto pso  = device.pipeline(Topology::Triangles,RenderState(),vert,frag);

auto tex  = device.attachment(format,128,128);

auto cmd  = device.commandBuffer();
{
  auto enc = cmd.startEncoding(device);
  enc.setFramebuffer({{tex,Vec4(0,0,1,1),Tempest::Preserve}});
  enc.setPipeline(pso);
  enc.draw(vbo,ibo);
}

auto sync = device.submit(cmd);
sync.wait();

// save image to file
auto pm = device.readPixels(tex);
pm.save(outImg);

Android builds

The Android packaging example uses add_android_apk in the application's existing CMake project to generate a single Gradle build. It uses Android's built-in NativeActivity; the Tempest Android backend is separate work. Desktop builds do not require Java, the Android SDK or Gradle.

Ecosystem

During development various issues of Vulkan stack been found, reported and some were fixed.

Contribution

• • MSL: task and mesh shader support
    KhronosGroup/SPIRV-Cross#2402
    KhronosGroup/SPIRV-Cross#2400
• • MSL: add ray-cull mask
    KhronosGroup/SPIRV-Cross#2241
• • State tracking of VkCopyDescriptorSet for KHR-acceleration-structure
    KhronosGroup/Vulkan-ValidationLayers#4219
• • MSL: runtime array over argument buffers
    KhronosGroup/SPIRV-Cross#2179
    KhronosGroup/SPIRV-Cross#2184
• • MSL: fix mutability for rayQueryEXT parameters
    KhronosGroup/SPIRV-Cross#2201
• • MSL: RayQuery implementation is incomplete
    KhronosGroup/SPIRV-Cross#2115
• • HLSL: Add mesh shader support
    KhronosGroup/SPIRV-Cross#2052
• • HLSL: Add task(amplification) shader support
    KhronosGroup/SPIRV-Cross#2124
• • HLSL: Cannot subdivide a scalar value exception
    KhronosGroup/SPIRV-Cross#2196
• • Mesh shader: fix implicit index-array size calculation for lines and triangles
    KhronosGroup/glslang#3050
• • Fix crash in HLSL frontend
    KhronosGroup/glslang#2916
• • stb_image: fix CRC reading at the end of IEND chunk in png file
    nothings/stb#835

Issues

• • MSL: fix extraction of global variables, in case of atomics
    KhronosGroup/SPIRV-Cross#2203
• • MSL: fix mutability for rayQueryEXT parameters
    KhronosGroup/SPIRV-Cross#2201
• • HLSL: Fix unroll, when storing to pointer to array
    KhronosGroup/SPIRV-Cross#2205
• • HLSL: SPIRV_Cross_VertexInfo is not relieble
    KhronosGroup/SPIRV-Cross#2032
• • HLSL: link error: Signatures between stages are incompatible
    KhronosGroup/SPIRV-Cross#1691
• • HLSL: error X4503: output TEXCOORD2 used more than once
    KhronosGroup/SPIRV-Cross#1645
• • HLSL: crash, while compiling HULL shader
    KhronosGroup/glslang#2914
• • MSL: invalid codegen, when using rayquery
    KhronosGroup/SPIRV-Cross#1910
• • SPIR-V -> HLSL : cross compiling bindings overlap
    KhronosGroup/SPIRV-Cross#2064
• • Component swizzling of gl_MeshVerticesEXT[].gl_Position, produces invalid code
    KhronosGroup/glslang#3058