/*
====================================================================================================

    Copyright (C) 2020 RRe36

    All Rights Reserved unless otherwise explicitly stated.


    By downloading this you have agreed to the license and terms of use.
    These can be found inside the included license-file
    or here: https://rre36.com/copyright-license

    Violating these terms may be penalized with actions according to the Digital Millennium
    Copyright Act (DMCA), the Information Society Directive and/or similar laws
    depending on your country.

====================================================================================================
*/

#include "/lib/head.glsl"

out mat2x2 coord;

out vec4 tint;

flat out vec3 normal;

uniform vec2 taaOffset;

uniform mat4 gbufferModelView, gbufferModelViewInverse;

attribute vec4 mc_midTexCoord;

#ifdef gTERRAIN
    flat out int foliage;

    flat out int mat_id;

    out vec3 worldPos;

    uniform vec3 cameraPosition;

    attribute vec4 mc_Entity;

    #ifdef windEffectsEnabled
        #include "/lib/vert/wind.glsl"
    #endif
#else
    flat out int emitter;
#endif

#ifdef gTEXTURED
    #if (defined normalmapEnabled || defined pomEnabled)
        //flat out int validAtTangent;

        flat out mat3 tbn;

        attribute vec4 at_tangent;
    #endif

    out float vertexDist;
    out vec2 vCoord;
    out vec4 vCoordAM;
    out vec3 viewVec;
#endif

void main() {
    coord[0]    = (gl_TextureMatrix[0] * gl_MultiTexCoord0).xy;
    coord[1]    = (gl_TextureMatrix[1] * gl_MultiTexCoord1).xy;

    #ifndef gTERRAIN
        emitter     = 0;
    #endif

    #if !(defined gTERRAIN || defined gENTITY) && defined gTEXTURED
        if (coord[1].x > (15.0 / 16.0)) emitter = 1;
    #endif

    coord[1].x  = linStep(coord[1].x, rcp(24.0), 1.0);
    coord[1].y  = linStep(coord[1].y, rcp(16.0), 1.0);

    vec4 pos    = gl_Vertex;
        pos     = viewMAD(gl_ModelViewMatrix, pos.xyz).xyzz;

    vec3 viewNormal     = normalize(gl_NormalMatrix*gl_Normal);

    normal      = mat3(gbufferModelViewInverse) * viewNormal;

    #ifdef gTEXTURED

        #ifdef pomEnabled
            vec3 viewTangent = normalize(gl_NormalMatrix*at_tangent.xyz);
            vec3 viewBinormal = normalize(gl_NormalMatrix*cross(at_tangent.xyz, gl_Normal.xyz) * at_tangent.w);

            mat3 viewtbn = mat3(viewTangent.x, viewBinormal.x, viewNormal.x,
                    viewTangent.y, viewBinormal.y, viewNormal.y,
                    viewTangent.z, viewBinormal.z, viewNormal.z);

            vec2 coordMid   = (gl_TextureMatrix[0] * mc_midTexCoord).xy;
            vec2 coordNMid  = coord[0] - coordMid;

            vCoordAM.zw     = abs(coordNMid) * 2.0;
            vCoordAM.xy     = min(coord[0], coordMid - coordNMid);

            vCoord          = sign(coordNMid) * 0.5 + 0.5;
            viewVec         = viewtbn * (gl_ModelViewMatrix * gl_Vertex).xyz;
            vertexDist      = length(pos.xyz);
        #elif defined normalmapEnabled
            vec3 viewTangent = normalize(gl_NormalMatrix*at_tangent.xyz);
            vec3 viewBinormal = normalize(gl_NormalMatrix*cross(at_tangent.xyz, gl_Normal.xyz) * at_tangent.w);
        #endif

        #ifdef normalmapEnabled
            vec3 tangent = mat3(gbufferModelViewInverse) * viewTangent;
            vec3 binormal = mat3(gbufferModelViewInverse) * viewBinormal;

            tbn     = mat3(tangent.x, binormal.x, normal.x,
                        tangent.y, binormal.y, normal.y,
                        tangent.z, binormal.z, normal.z);
        #endif
        /*
        #if (defined normalmapEnabled || defined pomEnabled)
            validAtTangent = any(greaterThan(abs(at_tangent.xyz), vec3(1e-2))) && clamp(at_tangent.xyz, -2.0, 2.0) == at_tangent.xyz && length(at_tangent.xyz) > 1e-2 ? 0 : 1;
        #endif
        */
    #endif

    tint        = gl_Color;

    #ifdef gTERRAIN
        worldPos = viewMAD(gbufferModelViewInverse, pos.xyz) + cameraPosition;
    #endif

    #if (defined gTERRAIN && defined windEffectsEnabled)
        pos.xyz = viewMAD(gbufferModelViewInverse, pos.xyz);

        bool windLod    = length(pos.xz) < 192.0;

        if (windLod) {
            bool topvert    = (gl_MultiTexCoord0.t < mc_midTexCoord.t);

            float occlude   = sqr(coord[1].y)*0.9+0.1;

            if (mc_Entity.x == 10021 || (mc_Entity.x == 10022 && topvert) || (mc_Entity.x == 10023 && topvert) || mc_Entity.x == 10024) {
                vec2 wind_offset = wind_effect(pos.xyz + cameraPosition, 0.18, 1.0)*occlude;

                if (mc_Entity.x == 10021) pos.xyz += wind_offset.xyy*0.4;
                else if (mc_Entity.x == 10023 || (mc_Entity.x == 10024 && !topvert)) pos.xz += wind_offset*0.5;
                else pos.xz += wind_offset;
            }
        }

        pos.xyz = viewMAD(gbufferModelView, pos.xyz);
    #endif

        pos     = pos.xyzz * diag4(gl_ProjectionMatrix) + vec4(0.0, 0.0, gl_ProjectionMatrix[3].z, 0.0);

    #ifdef taaEnabled
        pos.xy += taaOffset*pos.w;
    #endif
        
    gl_Position = pos;

    #ifdef gTERRAIN
        mat_id  = 1;

        if (
         mc_Entity.x == 10022 ||
         mc_Entity.x == 10023 ||
         mc_Entity.x == 10024 ||
         mc_Entity.x == 10025 ||
         mc_Entity.x == 10202) mat_id = 2;

        if (
         mc_Entity.x == 10021) mat_id = 4;

        if (mc_Entity.x == 10301 ||
         mc_Entity.x == 10002) mat_id = 5;

        if (mc_Entity.x == 10302) mat_id = 6;
    #endif
}