# NYXGFX
Low cortisol crossplatform RHI (Rendering Hardware Interface)

## Backends
- [x] Vulkan
- [ ] OpenGL
- [ ] DX12

## Features
- Fire and forget
- Dead simple + Performance + Flexible
- Handles
- Auto managed

## Architecture
```text
examples/simple/simple.zig

src/gfx.zig
  └─ Selected Backend

src/rhi/root.zig
  └─ Common / Handles / Configs

src/rhi/vulkan/vulkan.zig
  └─ Vulkan Backend / RHI

src/rhi/vulkan/resource.zig
  └─ Adapter / Device / Shader
```
| Function            | Description                                                       |
| ------------------- | ----------------------------------------------------------------- |
| `makeX(...)`        | Creates an RHI resource and returns its handle                    |
| `deleteX(handle)`   | Releases the resource and removes it from the resource pool       |
| `releaseX(handle)`  | Releases the resource without removing it from the resource pool  |
| `getXInfo(handle)`  | Returns backend-independent information about the resource        |
| `getRawVkX(handle)` | Returns the backend-specific raw Vulkan GPU handle                |

## Example
### Core
```zig
const adapter = try gfx.makeAdapter(.{});
const surface = try gfx.makeSurface();
const device = try gfx.makeDevice(adapter, surface);
const swapchain = try gfx.makeSwapchain(adapter, device, surface);
```
### Buffers
```zig
const vbuf = try gfx.makeBuffer(vertices, .vertex, adapter, device);
const ibuf = try gfx.makeBuffer(indices, .index, adapter, device);
```
### Shaders
```zig
const simple_vert = try gfx.makeShader("examples/assets/shaders/compiled/simple.vert.spv", device);
const simple_frag = try gfx.makeShader("examples/assets/shaders/compiled/simple.frag.spv", device);
```
### Pipelines
```zig
const pipeline = try gfx.makePipeline(.{
  .vertex_attributes = &.{
    .{ .location = 0, .format = .vec2, .offset = @offsetOf(Vertex, "pos") },
    .{ .location = 1, .format = .vec2, .offset = @offsetOf(Vertex, "normal") },
    .{ .location = 2, .format = .vec2, .offset = @offsetOf(Vertex, "uv") },
  },
  .vertex_binding = .{ .stride = @sizeOf(Vertex) },

  .uniforms = &.{
    .{ .name = "material", .offset = 0, .size = @sizeOf(UnlitMaterial) },
  },

  .textures = &.{texture},

  .blend_mode = .alpha,

  .vert_shader = simple_vert,
  .frag_shader = simple_frag,

  .device = device,
  .swapchain = swapchain,
});
```
### Render Pass
```zig
if (gfx.beginPass(swapchain, .{
  .clear_color = .{ 0.01, 0.01, 0.01, 1.0 },
})) |pass| {
  defer pass.end();

  try vbuf.bind();
  try ibuf.bind();

  try pipeline.setUniform("material", material);

  try pipeline.bind();
  pass.drawIndexed(indices.len, 1, 0, 0, 0);
}
```

## Examples
- ```zig build run-simple```
- ```zig build run-3D```