shader_vs_core

The standard Vertex Shader package. Defines the crucial attribute layout that matches the Vertex struct in Odin and provides helpers for coordinate space transformation.

ShaderData

layout(binding=0) uniform ShaderData {
  mat4 uViewProjectionMatrix;
}

Binding 0: The global shader data. Automatically uploaded by flushBatch.

aBytes

in vec4 aBytes;

Location 5: Packed data (texture index, layer, flags).

aColor

in vec4 aColor;

Location 1: Vertex color (rgba).

aColorOverride

in vec4 aColorOverride;

Location 6: Color override.

aLocalUv

in vec2 aLocalUv;

Location 3: Local UVs (0-1)

aParams

in vec4 aParams;

Location 7: Custom parameters for user shaders.

aPosition

in vec3 aPosition;

Location 0: World space position (x, y). Z position is used for depth.

aSize

in vec2 aSize;

Location 4: Size of the sprite in pixels.

aUv

in vec2 aUv;

Location 2: Atlas texture coordinates (u, v).

getProjectedPosition

vec4 getProjectedPosition(vec3 position) {
  return uViewProjectionMatrix * vec4(position.xy, 0.0, 1.0);
}

Transforms a raw 2D world position into clip space (screen coordinates). Applies the current camera and projection matrices.

Arguments:

position: World space position.

passVertexData

void passVertexData() {
  vPosition = aPosition;
  vColor = aColor;
  vUv = aUv;
  vLocalUv = aLocalUv;
  vSize = aSize;
  vBytes = aBytes;
  vColorOverride = aColorOverride;
  vParams = aParams;
}

Passes all standard attributes (color, UVs, flags, etc.) to the Fragment Shader.