/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
              Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

#ifndef NEW_GLSL
#define in attribute
#define out varying
#endif

#ifdef TWO_DIMENSIONS
#ifdef EXPLICIT_UNIFORM_LOCATION
layout(location = 0)
#endif
uniform highp mat3 transformationProjectionMatrix
    #ifndef GL_ES
    = mat3(1.0)
    #endif
    ;
#elif defined(THREE_DIMENSIONS)
#ifdef EXPLICIT_UNIFORM_LOCATION
layout(location = 0)
#endif
uniform highp mat4 transformationMatrix
    #ifndef GL_ES
    = mat4(1.0)
    #endif
    ;
#ifdef EXPLICIT_UNIFORM_LOCATION
layout(location = 6)
#endif
uniform highp mat4 projectionMatrix
    #ifndef GL_ES
    = mat4(1.0)
    #endif
    ;
#else
#error
#endif

#if defined(TANGENT_DIRECTION) || defined(BITANGENT_FROM_TANGENT_DIRECTION) || defined(BITANGENT_DIRECTION) || defined(NORMAL_DIRECTION)
#ifdef EXPLICIT_UNIFORM_LOCATION
layout(location = 7)
#endif
uniform highp mat3 normalMatrix
    #ifndef GL_ES
    = mat3(1.0)
    #endif
    ;

#ifdef EXPLICIT_UNIFORM_LOCATION
layout(location = 9)
#endif
uniform highp float lineLength
    #ifndef GL_ES
    = 1.0
    #endif
    ;
#endif

#ifdef EXPLICIT_ATTRIB_LOCATION
layout(location = POSITION_ATTRIBUTE_LOCATION)
#endif
#ifdef TWO_DIMENSIONS
in highp vec2 position;
#elif defined(THREE_DIMENSIONS)
in highp vec4 position;
#else
#error
#endif

#if defined(TANGENT_DIRECTION) || defined(BITANGENT_FROM_TANGENT_DIRECTION)
#ifdef EXPLICIT_ATTRIB_LOCATION
layout(location = TANGENT_ATTRIBUTE_LOCATION)
#endif
in highp vec4 tangent;
#endif

#ifdef BITANGENT_DIRECTION
#ifdef EXPLICIT_ATTRIB_LOCATION
layout(location = BITANGENT_ATTRIBUTE_LOCATION)
#endif
in highp vec3 bitangent;
#endif

#if defined(NORMAL_DIRECTION) || defined(BITANGENT_FROM_TANGENT_DIRECTION)
#ifdef EXPLICIT_ATTRIB_LOCATION
layout(location = NORMAL_ATTRIBUTE_LOCATION)
#endif
in highp vec3 normal;
#endif

#if defined(WIREFRAME_RENDERING) && defined(NO_GEOMETRY_SHADER)
#if (!defined(GL_ES) && __VERSION__ < 140) || (defined(GL_ES) && __VERSION__ < 300)
#ifdef EXPLICIT_ATTRIB_LOCATION
layout(location = 4)
#endif
in lowp float vertexIndex;
#define gl_VertexID int(vertexIndex)
#endif

out vec3 barycentric;
#endif

#ifdef TANGENT_DIRECTION
out highp vec4 tangentEndpoint;
#endif
#if defined(BITANGENT_DIRECTION) || defined(BITANGENT_FROM_TANGENT_DIRECTION)
out highp vec4 bitangentEndpoint;
#endif
#ifdef NORMAL_DIRECTION
out highp vec4 normalEndpoint;
#endif

void main() {
    #ifdef TWO_DIMENSIONS
    gl_Position.xywz = vec4(transformationProjectionMatrix*vec3(position, 1.0), 0.0);
    #elif defined(THREE_DIMENSIONS)
    gl_Position = projectionMatrix*transformationMatrix*position;
    #else
    #error
    #endif

    #ifdef TANGENT_DIRECTION
    tangentEndpoint = projectionMatrix*(transformationMatrix*position + vec4(normalize(normalMatrix*tangent.xyz)*lineLength, 0.0));
    #endif
    #ifdef BITANGENT_FROM_TANGENT_DIRECTION
    vec3 bitangent = cross(normal, tangent.xyz)*tangent.w;
    #endif
    #if defined(BITANGENT_DIRECTION) || defined(BITANGENT_FROM_TANGENT_DIRECTION)
    bitangentEndpoint = projectionMatrix*(transformationMatrix*position + vec4(normalize(normalMatrix*bitangent)*lineLength, 0.0));
    #endif
    #ifdef NORMAL_DIRECTION
    normalEndpoint = projectionMatrix*(transformationMatrix*position + vec4(normalize(normalMatrix*normal)*lineLength, 0.0));
    #endif

    #if defined(WIREFRAME_RENDERING) && defined(NO_GEOMETRY_SHADER)
    barycentric = vec3(0.0);

    #ifdef SUBSCRIPTING_WORKAROUND
    #ifndef NEW_GLSL
    int i = int(mod(vertexIndex, 3.0));
    #else
    int i = gl_VertexID % 3;
    #endif
         if(i == 0) barycentric.x = 1.0;
    else if(i == 1) barycentric.y = 1.0;
    else            barycentric.z = 1.0;
    #elif !defined(NEW_GLSL)
    barycentric[int(mod(vertexIndex, 3.0))] = 1.0;
    #else
    barycentric[gl_VertexID % 3] = 1.0;
    #endif

    #endif
}