# nvk-essentials

This package contains tools to aid development with [nvk](https://github.com/maierfelix/nvk)

## Interface:

### GLSL:

Contains pre-built binaries of `glslangValidator`.

Examples:
````js
import { GLSL } from "nvk-essentials";
`````

#### GLSL.*version*

Returns a string of the equivalent `glslangValidator -v`

Examples:

````js
let {version} = GLSL;
````

#### GLSL.*toSPIRV*

Returns the binary SPIR-V representation of the passed in GLSL source. This function expects an Object as it's first parameter in the following format:

````js
{
  source: <Buffer>,
  extension: <String>,
  *includeDirectories: <String[]>
}
````

Available extensions are:
* `.vert`  for a vertex shader
* `.tesc`  for a tessellation control shader
* `.tese`  for a tessellation evaluation shader
* `.geom`  for a geometry shader
* `.frag`  for a fragment shader
* `.comp`  for a compute shader
* `.mesh`  for a mesh shader
* `.task`  for a task shader
* `.rgen`  for a ray generation shader
* `.rint`  for a ray intersection shader
* `.rahit` for a ray any hit shader
* `.rchit` for a ray closest hit shader
* `.rmiss` for a ray miss shader
* `.rcall` for a ray callable shader
* `.glsl`  for .vert.glsl, .tesc.glsl, ..., .comp.glsl compound suffixes
* `.hlsl`  for .vert.hlsl, .tesc.hlsl, ..., .comp.hlsl compound suffixes

Examples:

````js
let {output, error} = await GLSL.toSPIRV({
  source: fs.readFileSync(`./shaders/object.vert`),
  extension: `vert`
});
````

#### GLSL.*toSPIRVSync*

Synchronous variant of `GLSL.toSPIRV` with an equal function signature.

Examples:

````js
let {output, error} = GLSL.toSPIRVSync({
  source: fs.readFileSync(`./shaders/object.frag`),
  extension: `frag`
});
````

#### includeDirectories

When having include directives in a shader, similar to C, an include Path has to be specified.

##### main.js
````js
let {output, error} = GLSL.toSPIRVSync({
  source: fs.readFileSync(`./shaders/main.vert`),
  extension: `vert`,
  includeDirectories: [`./shaders`]
});
````

##### shaders/main.vert
````glsl
#version 460

#extension GL_GOOGLE_include_directive : enable

#include "utils.glsl"

void main() {
  gl_Position = vec4(utilityColorFunction(), 1.0);
}
````

##### shaders/utils.glsl
````glsl
vec3 utilityColorFunction() {
  return vec3(1, 0, 0);
}
````