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#version 410 core
uniform sampler2D diffuseTex;
uniform sampler2DShadow shadowTex;
uniform vec3 groundAmbientColor;
uniform vec3 groundDiffuseColor;
uniform float groundShadowDensity;
uniform float gammaExponent;
uniform mat4 shadowMatrix;
uniform vec4 shadowParams;
uniform vec4 alphaTestCtrl;
uniform vec4 fogColor;
in vec4 vVertexPos;
in vec2 vTexCoord;
in vec4 vBaseColor;
in float vFogFactor;
layout(location = 0) out vec4 fFragColor;
void main() {
#if (TREE_SHADOW == 1)
// per-fragment
vec4 vertexShadowPos = shadowMatrix * vVertexPos;
float shadowCoeff = mix(1.0, textureProj(shadowTex, vertexShadowPos), groundShadowDensity);
#else
float shadowCoeff = 1.0;
#endif
vec4 diffuseCol = texture(diffuseTex, vTexCoord) * vBaseColor;
vec3 shadeInt = mix(groundAmbientColor.rgb, vec3(1.0, 1.0, 1.0), shadowCoeff);
{
float alphaTestGreater = float(diffuseCol.a > alphaTestCtrl.x) * alphaTestCtrl.y;
float alphaTestSmaller = float(diffuseCol.a < alphaTestCtrl.x) * alphaTestCtrl.z;
if ((alphaTestGreater + alphaTestSmaller + alphaTestCtrl.w) == 0.0)
discard;
}
fFragColor.rgb = diffuseCol.rgb * shadeInt.rgb;
fFragColor.rgb = mix(fogColor.rgb, fFragColor.rgb, vFogFactor);
fFragColor.rgb = pow(fFragColor.rgb, vec3(gammaExponent));
fFragColor.a = diffuseCol.a;
}
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