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.setUniforms(pso);
  enc.draw(vbo,ibo);
}

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

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

Ecosystem

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

Contribution

• • 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

• • [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