monado/src/xrt/compositor/shaders/equirect2.vert

// Copyright 2020 Collabora Ltd.
// Author: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
// SPDX-License-Identifier: BSL-1.0

#version 460

layout (binding = 0, std140) uniform Transformation {
  mat4 mvp;
  ivec2 offset;
  ivec2 extent;
  bool flip_y;
} transformation;

layout (location = 0) in vec3 position;
layout (location = 1) in vec2 uv;

layout (location = 0) out vec2 out_uv;


out gl_PerVertex {
  vec4 gl_Position;
};

const mat4 mvp = mat4(
  2, 0, 0, 0,
  0, 2, 0, 0,
  0, 0, 1, 0,
  0, 0, 0, 1
);

void main() {
  gl_Position = mvp * vec4 (position, 1.0f);
  gl_Position.y = -gl_Position.y;
  out_uv = uv;

  if (transformation.flip_y) {
    out_uv.y = 1.0 - out_uv.y;
  }
}