// Copyright 2022 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#version 450 core
#extension GL_ARB_separate_shader_objects : enable

layout (location = 0) in vec2 frag_tex_coord;
layout (location = 0) out vec4 color;

layout (push_constant, std140) uniform DrawInfo {
    mat4 modelview_matrix;
    vec4 i_resolution;
    vec4 o_resolution;
    int screen_id_l;
    int screen_id_r;
    int layer;
    int reverse_interlaced;
};

layout (set = 0, binding = 0) uniform sampler2D screen_textures[3];

void main() {
    float screen_row = o_resolution.x * frag_tex_coord.x;
    if (int(screen_row) % 2 == reverse_interlaced)
        color = texture(screen_textures[screen_id_l], frag_tex_coord);
    else
        color = texture(screen_textures[screen_id_r], frag_tex_coord);
}