nim2spirv
A backend for the Nim compiler and standalone executable to compile Nim into SPIR-V.
Note: This is an early proof-of-concept and work-in-progress!
Goals
- Make Nim an awesome shader language, closely mapping to SPIR-V concepts.
- Share code between host program and shader modules by compiling
.nim-files with bothnimandnim2spirv. - Define a high-level shader DSL through the power meta-programming that
- trivializes shader permutation management
- abstracts API differences
- exposes shader meta-data to the host program and authoring tools, by directly importing shader modules
Usage
This needs to built against a patched branch of the nim compiler: https://github.com/fragcolor-xyz/Nim/tree/nim2spirv
Use similarly to nim:
nim2spirv spirv test.nim
spirv-dis test.spv
spirv-opt -o test-opt.spv test.spv
Consume direcly with Vulkan or cross-compile with SPIRV-Cross.
Progress
Currently the following compiles and produces a valid SPIR-V module with a Vulkan vertex and fragment entry-point:
import shaders
type
Data = object
worldViewProjection {.rowMajor.}: Matrix4x4
var
data {.uniform, descriptorSet: 0, binding: 0.}: Data
position {.input, location: 0.}: Vector4
normal {.input, location: 1.}: Vector3
texCoordVIn {.input, location: 2.}: Vector2
texCoordVOut {.output, location: 0.}: Vector2
clipSpacePosition {.output, builtIn: Position.}: Vector4
texCoord {.input, location: 0.}: Vector2
color {.output, location: 0.}: Vector4
proc vsMain() {.stage: Vertex.} =
clipSpacePosition = construct[Vector4](position.xyz, 1.0'f32) * data.worldViewProjection
clipSpacePosition.y = -clipSpacePosition.y
texCoordVOut = texCoordVIn
proc fsMain() {.stage: Fragment.} =
color = construct[Vector4](texCoord.xy, 0.0'f32, 1.0'f32)
评论