// Copyright 2020 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Vertex shader
 struct Uniforms {
  modelViewProjectionMatrix : mat4x4<f32>,
};

@binding(0) @group(0) var<uniform> uniforms : Uniforms;

struct VertexInput {
  @location(0) cur_position : vec4<f32>,
  @location(1) color : vec4<f32>,
};

struct VertexOutput {
  @location(0) vtxFragColor : vec4<f32>,
  @builtin(position) Position : vec4<f32>,
};

@vertex
fn vtx_main(input : VertexInput) -> VertexOutput {
  var output : VertexOutput;
  output.Position = uniforms.modelViewProjectionMatrix * input.cur_position;
  output.vtxFragColor = input.color;
  return output;
}

// Fragment shader

@fragment
fn frag_main(@location(0) fragColor : vec4<f32>)
          -> @location(0) vec4<f32> {
  return fragColor;
}