/****************************************************************************
 Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.

 https://axis-project.github.io/

 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.
 ****************************************************************************/
 

const char* CC3D_positionNormalTexture_vert = R"(

#ifdef USE_NORMAL_MAPPING
#if (MAX_DIRECTIONAL_LIGHT_NUM > 0)
uniform vec3 u_DirLightSourceDirection[MAX_DIRECTIONAL_LIGHT_NUM];
#endif
#endif
#if (MAX_POINT_LIGHT_NUM > 0)
uniform vec3 u_PointLightSourcePosition[MAX_POINT_LIGHT_NUM];
#endif
#if (MAX_SPOT_LIGHT_NUM > 0)
uniform vec3 u_SpotLightSourcePosition[MAX_SPOT_LIGHT_NUM];
#ifdef USE_NORMAL_MAPPING
uniform vec3 u_SpotLightSourceDirection[MAX_SPOT_LIGHT_NUM];
#endif
#endif

attribute vec4 a_position;
attribute vec2 a_texCoord;
attribute vec3 a_normal;
#ifdef USE_NORMAL_MAPPING
attribute vec3 a_tangent;
attribute vec3 a_binormal;
#endif
varying vec2 TextureCoordOut;

#ifdef USE_NORMAL_MAPPING
#if MAX_DIRECTIONAL_LIGHT_NUM
varying vec3 v_dirLightDirection[MAX_DIRECTIONAL_LIGHT_NUM];
#endif
#endif
#if MAX_POINT_LIGHT_NUM
varying vec3 v_vertexToPointLightDirection[MAX_POINT_LIGHT_NUM];
#endif
#if MAX_SPOT_LIGHT_NUM
varying vec3 v_vertexToSpotLightDirection[MAX_SPOT_LIGHT_NUM];
#ifdef USE_NORMAL_MAPPING
varying vec3 v_spotLightDirection[MAX_SPOT_LIGHT_NUM];
#endif
#endif

#ifndef USE_NORMAL_MAPPING
#if ((MAX_DIRECTIONAL_LIGHT_NUM > 0) || (MAX_POINT_LIGHT_NUM > 0) || (MAX_SPOT_LIGHT_NUM > 0))
varying vec3 v_normal;
#endif
#endif

uniform mat4 u_MVPMatrix;
uniform mat4 u_MVMatrix;
uniform mat4 u_PMatrix;
uniform mat3 u_NormalMatrix;

void main(void)
{
    vec4 ePosition = u_MVMatrix * a_position;
#ifdef USE_NORMAL_MAPPING
    #if ((MAX_DIRECTIONAL_LIGHT_NUM > 0) || (MAX_POINT_LIGHT_NUM > 0) || (MAX_SPOT_LIGHT_NUM > 0))
        vec3 eTangent = normalize(u_NormalMatrix * a_tangent);
        vec3 eBinormal = normalize(u_NormalMatrix * a_binormal);
        vec3 eNormal = normalize(u_NormalMatrix * a_normal);
    #endif
    #if (MAX_DIRECTIONAL_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_DIRECTIONAL_LIGHT_NUM; ++i)
        {
            v_dirLightDirection[i].x = dot(eTangent, u_DirLightSourceDirection[i]);
            v_dirLightDirection[i].y = dot(eBinormal, u_DirLightSourceDirection[i]);
            v_dirLightDirection[i].z = dot(eNormal, u_DirLightSourceDirection[i]);
        }
    #endif

    #if (MAX_POINT_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_POINT_LIGHT_NUM; ++i)
        {
            vec3 pointLightDir = u_PointLightSourcePosition[i].xyz - ePosition.xyz;
            v_vertexToPointLightDirection[i].x = dot(eTangent, pointLightDir);
            v_vertexToPointLightDirection[i].y = dot(eBinormal, pointLightDir);
            v_vertexToPointLightDirection[i].z = dot(eNormal, pointLightDir);
        }
    #endif

    #if (MAX_SPOT_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_SPOT_LIGHT_NUM; ++i)
        {
            vec3 spotLightDir = u_SpotLightSourcePosition[i] - ePosition.xyz;
            v_vertexToSpotLightDirection[i].x = dot(eTangent, spotLightDir);
            v_vertexToSpotLightDirection[i].y = dot(eBinormal, spotLightDir);
            v_vertexToSpotLightDirection[i].z = dot(eNormal, spotLightDir);

            v_spotLightDirection[i].x = dot(eTangent, u_SpotLightSourceDirection[i]);
            v_spotLightDirection[i].y = dot(eBinormal, u_SpotLightSourceDirection[i]);
            v_spotLightDirection[i].z = dot(eNormal, u_SpotLightSourceDirection[i]);
        }
    #endif
#else
    #if (MAX_POINT_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_POINT_LIGHT_NUM; ++i)
        {
            v_vertexToPointLightDirection[i] = u_PointLightSourcePosition[i].xyz - ePosition.xyz;
        }
    #endif

    #if (MAX_SPOT_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_SPOT_LIGHT_NUM; ++i)
        {
            v_vertexToSpotLightDirection[i] = u_SpotLightSourcePosition[i] - ePosition.xyz;
        }
    #endif

    #if ((MAX_DIRECTIONAL_LIGHT_NUM > 0) || (MAX_POINT_LIGHT_NUM > 0) || (MAX_SPOT_LIGHT_NUM > 0))
        v_normal = u_NormalMatrix * a_normal;
    #endif
#endif

    TextureCoordOut = a_texCoord;
    TextureCoordOut.y = 1.0 - TextureCoordOut.y;
    gl_Position = u_PMatrix * ePosition;
}
)";

const char* CC3D_skinPositionNormalTexture_vert = R"(



#ifdef USE_NORMAL_MAPPING
#if (MAX_DIRECTIONAL_LIGHT_NUM > 0)
uniform vec3 u_DirLightSourceDirection[MAX_DIRECTIONAL_LIGHT_NUM];
#endif
#endif
#if (MAX_POINT_LIGHT_NUM > 0)
uniform vec3 u_PointLightSourcePosition[MAX_POINT_LIGHT_NUM];
#endif
#if (MAX_SPOT_LIGHT_NUM > 0)
uniform vec3 u_SpotLightSourcePosition[MAX_SPOT_LIGHT_NUM];
#ifdef USE_NORMAL_MAPPING
uniform vec3 u_SpotLightSourceDirection[MAX_SPOT_LIGHT_NUM];
#endif
#endif

attribute vec3 a_position;

attribute vec4 a_blendWeight;
attribute vec4 a_blendIndex;

attribute vec2 a_texCoord;

attribute vec3 a_normal;
#ifdef USE_NORMAL_MAPPING
attribute vec3 a_tangent;
attribute vec3 a_binormal;
#endif

const int SKINNING_JOINT_COUNT = 60;
// Uniforms
uniform vec4 u_matrixPalette[SKINNING_JOINT_COUNT * 3];

uniform mat4 u_MVMatrix;
uniform mat3 u_NormalMatrix;
uniform mat4 u_PMatrix;

// Varyings
varying vec2 TextureCoordOut;

#ifdef USE_NORMAL_MAPPING
#if MAX_DIRECTIONAL_LIGHT_NUM
varying vec3 v_dirLightDirection[MAX_DIRECTIONAL_LIGHT_NUM];
#endif
#endif
#if MAX_POINT_LIGHT_NUM
varying vec3 v_vertexToPointLightDirection[MAX_POINT_LIGHT_NUM];
#endif
#if MAX_SPOT_LIGHT_NUM
varying vec3 v_vertexToSpotLightDirection[MAX_SPOT_LIGHT_NUM];
#ifdef USE_NORMAL_MAPPING
varying vec3 v_spotLightDirection[MAX_SPOT_LIGHT_NUM];
#endif
#endif

#ifndef USE_NORMAL_MAPPING
#if ((MAX_DIRECTIONAL_LIGHT_NUM > 0) || (MAX_POINT_LIGHT_NUM > 0) || (MAX_SPOT_LIGHT_NUM > 0))
varying vec3 v_normal;
#endif
#endif

void getPositionAndNormal(out vec4 position, out vec3 normal, out vec3 tangent, out vec3 binormal)
{
    float blendWeight = a_blendWeight[0];

    int matrixIndex = int (a_blendIndex[0]) * 3;
    vec4 matrixPalette1 = u_matrixPalette[matrixIndex] * blendWeight;
    vec4 matrixPalette2 = u_matrixPalette[matrixIndex + 1] * blendWeight;
    vec4 matrixPalette3 = u_matrixPalette[matrixIndex + 2] * blendWeight;


    blendWeight = a_blendWeight[1];
    if (blendWeight > 0.0)
    {
        matrixIndex = int(a_blendIndex[1]) * 3;
        matrixPalette1 += u_matrixPalette[matrixIndex] * blendWeight;
        matrixPalette2 += u_matrixPalette[matrixIndex + 1] * blendWeight;
        matrixPalette3 += u_matrixPalette[matrixIndex + 2] * blendWeight;

        blendWeight = a_blendWeight[2];
        if (blendWeight > 0.0)
        {
            matrixIndex = int(a_blendIndex[2]) * 3;
            matrixPalette1 += u_matrixPalette[matrixIndex] * blendWeight;
            matrixPalette2 += u_matrixPalette[matrixIndex + 1] * blendWeight;
            matrixPalette3 += u_matrixPalette[matrixIndex + 2] * blendWeight;

            blendWeight = a_blendWeight[3];
            if (blendWeight > 0.0)
            {
                matrixIndex = int(a_blendIndex[3]) * 3;
                matrixPalette1 += u_matrixPalette[matrixIndex] * blendWeight;
                matrixPalette2 += u_matrixPalette[matrixIndex + 1] * blendWeight;
                matrixPalette3 += u_matrixPalette[matrixIndex + 2] * blendWeight;
            }
        }
    }

    vec4 p = vec4(a_position, 1.0);
    position.x = dot(p, matrixPalette1);
    position.y = dot(p, matrixPalette2);
    position.z = dot(p, matrixPalette3);
    position.w = p.w;

#if ((MAX_DIRECTIONAL_LIGHT_NUM > 0) || (MAX_POINT_LIGHT_NUM > 0) || (MAX_SPOT_LIGHT_NUM > 0))
    vec4 n = vec4(a_normal, 0.0);
    normal.x = dot(n, matrixPalette1);
    normal.y = dot(n, matrixPalette2);
    normal.z = dot(n, matrixPalette3);
#ifdef USE_NORMAL_MAPPING
    vec4 t = vec4(a_tangent, 0.0);
    tangent.x = dot(t, matrixPalette1);
    tangent.y = dot(t, matrixPalette2);
    tangent.z = dot(t, matrixPalette3);
    vec4 b = vec4(a_binormal, 0.0);
    binormal.x = dot(b, matrixPalette1);
    binormal.y = dot(b, matrixPalette2);
    binormal.z = dot(b, matrixPalette3);
#endif
#endif
}

void main()
{
    vec4 position;
    vec3 normal;
    vec3 tangent;
    vec3 binormal;
    getPositionAndNormal(position, normal, tangent, binormal);
    vec4 ePosition = u_MVMatrix * position;

#ifdef USE_NORMAL_MAPPING
    #if ((MAX_DIRECTIONAL_LIGHT_NUM > 0) || (MAX_POINT_LIGHT_NUM > 0) || (MAX_SPOT_LIGHT_NUM > 0))
        vec3 eTangent = normalize(u_NormalMatrix * tangent);
        vec3 eBinormal = normalize(u_NormalMatrix * binormal);
        vec3 eNormal = normalize(u_NormalMatrix * normal);
    #endif

    #if (MAX_DIRECTIONAL_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_DIRECTIONAL_LIGHT_NUM; ++i)
        {
            v_dirLightDirection[i].x = dot(eTangent, u_DirLightSourceDirection[i]);
            v_dirLightDirection[i].y = dot(eBinormal, u_DirLightSourceDirection[i]);
            v_dirLightDirection[i].z = dot(eNormal, u_DirLightSourceDirection[i]);
        }
    #endif

    #if (MAX_POINT_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_POINT_LIGHT_NUM; ++i)
        {
            vec3 pointLightDir = u_PointLightSourcePosition[i].xyz - ePosition.xyz;
            v_vertexToPointLightDirection[i].x = dot(eTangent, pointLightDir);
            v_vertexToPointLightDirection[i].y = dot(eBinormal, pointLightDir);
            v_vertexToPointLightDirection[i].z = dot(eNormal, pointLightDir);
        }
    #endif

    #if (MAX_SPOT_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_SPOT_LIGHT_NUM; ++i)
        {
            vec3 spotLightDir = u_SpotLightSourcePosition[i] - ePosition.xyz;
            v_vertexToSpotLightDirection[i].x = dot(eTangent, spotLightDir);
            v_vertexToSpotLightDirection[i].y = dot(eBinormal, spotLightDir);
            v_vertexToSpotLightDirection[i].z = dot(eNormal, spotLightDir);

            v_spotLightDirection[i].x = dot(eTangent, u_SpotLightSourceDirection[i]);
            v_spotLightDirection[i].y = dot(eBinormal, u_SpotLightSourceDirection[i]);
            v_spotLightDirection[i].z = dot(eNormal, u_SpotLightSourceDirection[i]);
        }
    #endif
#else
    #if (MAX_POINT_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_POINT_LIGHT_NUM; ++i)
        {
            v_vertexToPointLightDirection[i] = u_PointLightSourcePosition[i].xyz- ePosition.xyz;
        }
    #endif

    #if (MAX_SPOT_LIGHT_NUM > 0)
        for (int i = 0; i < MAX_SPOT_LIGHT_NUM; ++i)
        {
            v_vertexToSpotLightDirection[i] = u_SpotLightSourcePosition[i] - ePosition.xyz;
        }
    #endif

    #if ((MAX_DIRECTIONAL_LIGHT_NUM > 0) || (MAX_POINT_LIGHT_NUM > 0) || (MAX_SPOT_LIGHT_NUM > 0))
        v_normal = u_NormalMatrix * normal;
    #endif
#endif

    TextureCoordOut = a_texCoord;
    TextureCoordOut.y = 1.0 - TextureCoordOut.y;
    gl_Position = u_PMatrix * ePosition;
}

)";