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uniform mat4 mWorld;
uniform vec3 dayLight;
uniform vec3 eyePosition;
uniform float animationTimer;
uniform vec4 emissiveColor;
uniform vec3 cameraOffset;
varying vec3 vNormal;
varying vec3 vPosition;
varying vec3 worldPosition;
varying lowp vec4 varColor;
#ifdef GL_ES
varying mediump vec2 varTexCoord;
#else
centroid varying vec2 varTexCoord;
#endif
#ifdef ENABLE_DYNAMIC_SHADOWS
// shadow uniforms
uniform vec3 v_LightDirection;
uniform float f_textureresolution;
uniform mat4 m_ShadowViewProj;
uniform float f_shadowfar;
uniform float f_shadow_strength;
uniform float f_timeofday;
uniform vec4 CameraPos;
varying float cosLight;
varying float adj_shadow_strength;
varying float f_normal_length;
varying vec3 shadow_position;
#endif
varying vec3 eyeVec;
varying float nightRatio;
// Color of the light emitted by the light sources.
const vec3 artificialLight = vec3(1.04, 1.04, 1.04);
varying float vIDiff;
const float e = 2.718281828459;
const float BS = 10.0;
uniform float xyPerspectiveBias0;
uniform float xyPerspectiveBias1;
uniform float zPerspectiveBias;
#ifdef ENABLE_DYNAMIC_SHADOWS
vec4 getRelativePosition(in vec4 position)
{
vec2 l = position.xy - CameraPos.xy;
vec2 s = l / abs(l);
s = (1.0 - s * CameraPos.xy);
l /= s;
return vec4(l, s);
}
float getPerspectiveFactor(in vec4 relativePosition)
{
float pDistance = length(relativePosition.xy);
float pFactor = pDistance * xyPerspectiveBias0 + xyPerspectiveBias1;
return pFactor;
}
vec4 applyPerspectiveDistortion(in vec4 position)
{
vec4 l = getRelativePosition(position);
float pFactor = getPerspectiveFactor(l);
l.xy /= pFactor;
position.xy = l.xy * l.zw + CameraPos.xy;
position.z *= zPerspectiveBias;
return position;
}
// custom smoothstep implementation because it's not defined in glsl1.2
// https://docs.gl/sl4/smoothstep
float mtsmoothstep(in float edge0, in float edge1, in float x)
{
float t = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);
return t * t * (3.0 - 2.0 * t);
}
#endif
float directional_ambient(vec3 normal)
{
vec3 v = normal * normal;
if (normal.y < 0.0)
return dot(v, vec3(0.670820, 0.447213, 0.836660));
return dot(v, vec3(0.670820, 1.000000, 0.836660));
}
void main(void)
{
varTexCoord = (mTexture * inTexCoord0).st;
gl_Position = mWorldViewProj * inVertexPosition;
vPosition = gl_Position.xyz;
vNormal = (mWorld * vec4(inVertexNormal, 0.0)).xyz;
worldPosition = (mWorld * inVertexPosition).xyz;
eyeVec = -(mWorldView * inVertexPosition).xyz;
#if (MATERIAL_TYPE == TILE_MATERIAL_PLAIN) || (MATERIAL_TYPE == TILE_MATERIAL_PLAIN_ALPHA)
vIDiff = 1.0;
#else
// This is intentional comparison with zero without any margin.
// If normal is not equal to zero exactly, then we assume it's a valid, just not normalized vector
vIDiff = length(inVertexNormal) == 0.0
? 1.0
: directional_ambient(normalize(inVertexNormal));
#endif
#ifdef GL_ES
vec4 color = inVertexColor.bgra;
#else
vec4 color = inVertexColor;
#endif
color *= emissiveColor;
// The alpha gives the ratio of sunlight in the incoming light.
nightRatio = 1.0 - color.a;
color.rgb = color.rgb * (color.a * dayLight.rgb +
nightRatio * artificialLight.rgb) * 2.0;
color.a = 1.0;
// Emphase blue a bit in darker places
// See C++ implementation in mapblock_mesh.cpp final_color_blend()
float brightness = (color.r + color.g + color.b) / 3.0;
color.b += max(0.0, 0.021 - abs(0.2 * brightness - 0.021) +
0.07 * brightness);
varColor = clamp(color, 0.0, 1.0);
#ifdef ENABLE_DYNAMIC_SHADOWS
if (f_shadow_strength > 0.0) {
vec3 nNormal = normalize(vNormal);
f_normal_length = length(vNormal);
/* normalOffsetScale is in world coordinates (1/10th of a meter)
z_bias is in light space coordinates */
float normalOffsetScale, z_bias;
float pFactor = getPerspectiveFactor(getRelativePosition(m_ShadowViewProj * mWorld * inVertexPosition));
if (f_normal_length > 0.0) {
nNormal = normalize(vNormal);
cosLight = dot(nNormal, -v_LightDirection);
float sinLight = pow(1 - pow(cosLight, 2.0), 0.5);
normalOffsetScale = 0.1 * pFactor * pFactor * sinLight * min(f_shadowfar, 500.0) /
xyPerspectiveBias1 / f_textureresolution;
z_bias = 1e3 * sinLight / cosLight * (0.5 + f_textureresolution / 1024.0);
}
else {
nNormal = vec3(0.0);
cosLight = clamp(dot(v_LightDirection, normalize(vec3(v_LightDirection.x, 0.0, v_LightDirection.z))), 1e-2, 1.0);
float sinLight = pow(1 - pow(cosLight, 2.0), 0.5);
normalOffsetScale = 0.0;
z_bias = 3.6e3 * sinLight / cosLight;
}
z_bias *= pFactor * pFactor / f_textureresolution / f_shadowfar;
shadow_position = applyPerspectiveDistortion(m_ShadowViewProj * mWorld * (inVertexPosition + vec4(normalOffsetScale * nNormal, 0.0))).xyz;
shadow_position.z -= z_bias;
if (f_timeofday < 0.2) {
adj_shadow_strength = f_shadow_strength * 0.5 *
(1.0 - mtsmoothstep(0.18, 0.2, f_timeofday));
} else if (f_timeofday >= 0.8) {
adj_shadow_strength = f_shadow_strength * 0.5 *
mtsmoothstep(0.8, 0.83, f_timeofday);
} else {
adj_shadow_strength = f_shadow_strength *
mtsmoothstep(0.20, 0.25, f_timeofday) *
(1.0 - mtsmoothstep(0.7, 0.8, f_timeofday));
}
}
#endif
}
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