struct Transforms {
  float4x4 projection;
  float4x4 view;
  float4x4 model;
}

struct Colors {
  bool hasTexture;
  float4 colors[4];
  int somethingElse;
  Sampler2D texture;
}

uniform Transforms transforms;
uniform Colors colors;

struct AssembledVertex {
  float3 position : POSITION;
  float2 texcoord : TEXCOORD;
};

struct Fragment {
  float4 color;
};

struct VertexStageOutput {
  float2 uv : UV;
  float4 sv_position : SV_Position;
};

[shader("vertex")]
VertexStageOutput vertexMain(
  AssembledVertex assembledVertex
) {
  VertexStageOutput output;

  float3 position = assembledVertex.position;

  output.uv = assembledVertex.texcoord;

  output.sv_position = mul(
    float4(position, 1.0),
    mul(transforms.model, mul(transforms.view, transforms.projection))
  );

  return output;
}

[shader("fragment")]
Fragment fragmentMain(
  float2 uv: UV
) : SV_Target {
  Fragment output;
  if (colors.hasTexture) {
      output.color = colors.texture.Sample(uv) * colors.colors[0];
  } else {
      output.color = colors.colors[0] - float4(colors.somethingElse, 0, 0, 0);
  }
  return output;
}