axmol/core/renderer/shaders/3D_terrain.frag

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

 https://axys1.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
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 furnished to do so, subject to the following conditions:

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 all copies or substantial portions of the Software.

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 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,
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 THE SOFTWARE.
 ****************************************************************************/
 

const char* CC3D_terrain_frag = R"(
#ifdef GL_ES
precision mediump float;
#endif
uniform vec3 u_color;
varying vec2 v_texCoord;
varying vec3 v_normal;
#ifdef GL_ES
uniform lowp int u_has_alpha;
uniform lowp int u_has_light_map;
#else
uniform int u_has_alpha;
uniform int u_has_light_map;
#endif
uniform sampler2D u_alphaMap;
uniform sampler2D u_tex0;
uniform sampler2D u_tex1;
uniform sampler2D u_tex2;
uniform sampler2D u_tex3;
uniform sampler2D u_lightMap;
uniform float u_detailSize[4];
uniform vec3 u_lightDir;
void main()
{
vec4 lightColor;
if(u_has_light_map<=0)
{
    lightColor = vec4(1.0,1.0,1.0,1.0);
}else
{
    lightColor = texture2D(u_lightMap,v_texCoord);
}
float lightFactor = dot(-u_lightDir,v_normal);
if(u_has_alpha<=0)
{
    gl_FragColor = texture2D(u_tex0, v_texCoord)*lightColor*lightFactor;
}else
{
    vec4 blendFactor =texture2D(u_alphaMap,v_texCoord);
    vec4 color = vec4(0.0,0.0,0.0,0.0);
    color = texture2D(u_tex0, v_texCoord*u_detailSize[0])*blendFactor.r +
    texture2D(u_tex1, v_texCoord*u_detailSize[1])*blendFactor.g + texture2D(u_tex2, v_texCoord*u_detailSize[2])*blendFactor.b
        + texture2D(u_tex3, v_texCoord*u_detailSize[3])*(1.0 - blendFactor.a);
    gl_FragColor = vec4(color.rgb*lightColor.rgb*lightFactor, 1.0);
}
}
)";