FFNx.vert

/****************************************************************************/
//    Copyright (C) 2009 Aali132                                            //
//    Copyright (C) 2018 quantumpencil                                      //
//    Copyright (C) 2018 Maxime Bacoux                                      //
//    Copyright (C) 2020 myst6re                                            //
//    Copyright (C) 2020 Chris Rizzitello                                   //
//    Copyright (C) 2020 John Pritchard                                     //
//    Copyright (C) 2023 Julian Xhokaxhiu                                   //
//                                                                          //
//    This file is part of FFNx                                             //
//                                                                          //
//    FFNx is free software: you can redistribute it and/or modify          //
//    it under the terms of the GNU General Public License as published by  //
//    the Free Software Foundation, either version 3 of the License         //
//                                                                          //
//    FFNx is distributed in the hope that it will be useful,               //
//    but WITHOUT ANY WARRANTY; without even the implied warranty of        //
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
//    GNU General Public License for more details.                          //
/****************************************************************************/

$input a_position, a_color0, a_texcoord0
$output v_color0, v_texcoord0

#include <bgfx/bgfx_shader.sh>

uniform mat4 d3dViewport;
uniform mat4 d3dProjection;
uniform mat4 worldView;

uniform vec4 VSFlags;
#define isTLVertex VSFlags.x > 0.0
#define blendMode VSFlags.y
#define isFBTexture VSFlags.z > 0.0

void main()
{
    vec4 pos = a_position;
    vec4 color = a_color0;
    vec2 coords = a_texcoord0;

    color.rgba = color.bgra;

    if (isTLVertex)
    {
        pos.w = 1.0 / pos.w;
        pos.xyz *= pos.w;
        pos = mul(u_proj, pos);
    }
    else
    {
        pos = mul(mul(d3dViewport,mul(d3dProjection,worldView)), vec4(pos.xyz, 1.0));

        if (color.a > 0.5) color.a = 0.5;
    }

    if (blendMode == 4.0) color.a = 1.0;
    else if (blendMode == 3.0) color.a = 0.25;

#if BGFX_SHADER_LANGUAGE_HLSL
#else
    #if BGFX_SHADER_LANGUAGE_SPIRV
    #else
        if (isFBTexture) coords.y = 1.0 - coords.y;
    #endif
#endif

    gl_Position = pos;
    v_color0 = color;
    v_texcoord0 = coords;
}