1// Copyright 2020 The Tint Authors.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15// Vertex shader
16[[stage(vertex)]]
17fn vtx_main([[builtin(vertex_index)]] VertexIndex : u32)
18         -> [[builtin(position)]] vec4<f32> {
19  var pos : array<vec2<f32>, 3> = array<vec2<f32>, 3>(
20      vec2<f32>(0.0, 0.5),
21      vec2<f32>(-0.5, -0.5),
22      vec2<f32>(0.5, -0.5));
23  return vec4<f32>(pos[VertexIndex], 0.0, 1.0);
24}
25
26// Fragment shader
27[[stage(fragment)]]
28fn frag_main() -> [[location(0)]] vec4<f32> {
29  return vec4<f32>(1.0, 0.0, 0.0, 1.0);
30}
31