minetest/client/shaders/object_shader/opengl_fragment.glsl

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uniform sampler2D baseTexture;
uniform vec4 emissiveColor;
uniform vec4 skyBgColor;
uniform float fogDistance;
uniform vec3 eyePosition;
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
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varying vec3 eyeVec;
varying float vIDiff;
const float e = 2.718281828459;
const float BS = 10.0;
const float fogStart = FOG_START;
const float fogShadingParameter = 1.0 / (1.0 - fogStart);
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#ifdef ENABLE_DYNAMIC_SHADOWS
// shadow texture
uniform sampler2D ShadowMapSampler;
// shadow uniforms
uniform vec3 v_LightDirection;
uniform float f_textureresolution;
uniform mat4 m_ShadowViewProj;
uniform float f_shadowfar;
uniform float f_timeofday;
varying float normalOffsetScale;
varying float adj_shadow_strength;
varying float cosLight;
varying float f_normal_length;
#endif
#if ENABLE_TONE_MAPPING
/* Hable's UC2 Tone mapping parameters
A = 0.22;
B = 0.30;
C = 0.10;
D = 0.20;
E = 0.01;
F = 0.30;
W = 11.2;
equation used: ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
*/
vec3 uncharted2Tonemap(vec3 x)
{
return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
}
vec4 applyToneMapping(vec4 color)
{
color = vec4(pow(color.rgb, vec3(2.2)), color.a);
const float gamma = 1.6;
const float exposureBias = 5.5;
color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
// Precalculated white_scale from
//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
vec3 whiteScale = vec3(1.036015346);
color.rgb *= whiteScale;
return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
}
#endif
#ifdef ENABLE_DYNAMIC_SHADOWS
const float bias0 = 0.9;
const float zPersFactor = 0.5;
const float bias1 = 1.0 - bias0;
vec4 getPerspectiveFactor(in vec4 shadowPosition)
{
float pDistance = length(shadowPosition.xy);
float pFactor = pDistance * bias0 + bias1;
shadowPosition.xyz *= vec3(vec2(1.0 / pFactor), zPersFactor);
return shadowPosition;
}
// assuming near is always 1.0
float getLinearDepth()
{
return 2.0 * f_shadowfar / (f_shadowfar + 1.0 - (2.0 * gl_FragCoord.z - 1.0) * (f_shadowfar - 1.0));
}
vec3 getLightSpacePosition()
{
vec4 pLightSpace;
float normalBias = 0.0005 * getLinearDepth() * cosLight + normalOffsetScale;
pLightSpace = m_ShadowViewProj * vec4(worldPosition + normalBias * normalize(vNormal), 1.0);
pLightSpace = getPerspectiveFactor(pLightSpace);
return pLightSpace.xyz * 0.5 + 0.5;
}
#ifdef COLORED_SHADOWS
// c_precision of 128 fits within 7 base-10 digits
const float c_precision = 128.0;
const float c_precisionp1 = c_precision + 1.0;
float packColor(vec3 color)
{
return floor(color.b * c_precision + 0.5)
+ floor(color.g * c_precision + 0.5) * c_precisionp1
+ floor(color.r * c_precision + 0.5) * c_precisionp1 * c_precisionp1;
}
vec3 unpackColor(float value)
{
vec3 color;
color.b = mod(value, c_precisionp1) / c_precision;
color.g = mod(floor(value / c_precisionp1), c_precisionp1) / c_precision;
color.r = floor(value / (c_precisionp1 * c_precisionp1)) / c_precision;
return color;
}
vec4 getHardShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
vec4 texDepth = texture2D(shadowsampler, smTexCoord.xy).rgba;
float visibility = step(0.0, (realDistance-2e-5) - texDepth.r);
vec4 result = vec4(visibility, vec3(0.0,0.0,0.0));//unpackColor(texDepth.g));
if (visibility < 0.1) {
visibility = step(0.0, (realDistance-2e-5) - texDepth.r);
result = vec4(visibility, unpackColor(texDepth.a));
}
return result;
}
#else
float getHardShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
float texDepth = texture2D(shadowsampler, smTexCoord.xy).r;
float visibility = step(0.0, (realDistance-2e-5) - texDepth);
return visibility;
}
#endif
#if SHADOW_FILTER == 2
#define PCFBOUND 3.5
#define PCFSAMPLES 64.0
#elif SHADOW_FILTER == 1
#define PCFBOUND 1.5
#if defined(POISSON_FILTER)
#define PCFSAMPLES 32.0
#else
#define PCFSAMPLES 16.0
#endif
#else
#define PCFBOUND 0.0
#if defined(POISSON_FILTER)
#define PCFSAMPLES 4.0
#else
#define PCFSAMPLES 1.0
#endif
#endif
#ifdef POISSON_FILTER
const vec2[64] poissonDisk = vec2[64](
vec2(0.170019, -0.040254),
vec2(-0.299417, 0.791925),
vec2(0.645680, 0.493210),
vec2(-0.651784, 0.717887),
vec2(0.421003, 0.027070),
vec2(-0.817194, -0.271096),
vec2(-0.705374, -0.668203),
vec2(0.977050, -0.108615),
vec2(0.063326, 0.142369),
vec2(0.203528, 0.214331),
vec2(-0.667531, 0.326090),
vec2(-0.098422, -0.295755),
vec2(-0.885922, 0.215369),
vec2(0.566637, 0.605213),
vec2(0.039766, -0.396100),
vec2(0.751946, 0.453352),
vec2(0.078707, -0.715323),
vec2(-0.075838, -0.529344),
vec2(0.724479, -0.580798),
vec2(0.222999, -0.215125),
vec2(-0.467574, -0.405438),
vec2(-0.248268, -0.814753),
vec2(0.354411, -0.887570),
vec2(0.175817, 0.382366),
vec2(0.487472, -0.063082),
vec2(0.355476, 0.025357),
vec2(-0.084078, 0.898312),
vec2(0.488876, -0.783441),
vec2(0.470016, 0.217933),
vec2(-0.696890, -0.549791),
vec2(-0.149693, 0.605762),
vec2(0.034211, 0.979980),
vec2(0.503098, -0.308878),
vec2(-0.016205, -0.872921),
vec2(0.385784, -0.393902),
vec2(-0.146886, -0.859249),
vec2(0.643361, 0.164098),
vec2(0.634388, -0.049471),
vec2(-0.688894, 0.007843),
vec2(0.464034, -0.188818),
vec2(-0.440840, 0.137486),
vec2(0.364483, 0.511704),
vec2(0.034028, 0.325968),
vec2(0.099094, -0.308023),
vec2(0.693960, -0.366253),
vec2(0.678884, -0.204688),
vec2(0.001801, 0.780328),
vec2(0.145177, -0.898984),
vec2(0.062655, -0.611866),
vec2(0.315226, -0.604297),
vec2(-0.780145, 0.486251),
vec2(-0.371868, 0.882138),
vec2(0.200476, 0.494430),
vec2(-0.494552, -0.711051),
vec2(0.612476, 0.705252),
vec2(-0.578845, -0.768792),
vec2(-0.772454, -0.090976),
vec2(0.504440, 0.372295),
vec2(0.155736, 0.065157),
vec2(0.391522, 0.849605),
vec2(-0.620106, -0.328104),
vec2(0.789239, -0.419965),
vec2(-0.545396, 0.538133),
vec2(-0.178564, -0.596057)
);
#ifdef COLORED_SHADOWS
vec4 getShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
vec2 clampedpos;
vec4 visibility = vec4(0.0);
float texture_size = 1.0 / (f_textureresolution * 0.5);
int init_offset = int(floor(mod(((smTexCoord.x * 34.0) + 1.0) * smTexCoord.y, 64.0-PCFSAMPLES)));
int end_offset = int(PCFSAMPLES) + init_offset;
for (int x = init_offset; x < end_offset; x++) {
clampedpos = poissonDisk[x] * texture_size * SOFTSHADOWRADIUS + smTexCoord.xy;
visibility += getHardShadowColor(shadowsampler, clampedpos.xy, realDistance);
}
return visibility / PCFSAMPLES;
}
#else
float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
vec2 clampedpos;
float visibility = 0.0;
float texture_size = 1.0 / (f_textureresolution * 0.5);
int init_offset = int(floor(mod(((smTexCoord.x * 34.0) + 1.0) * smTexCoord.y, 64.0-PCFSAMPLES)));
int end_offset = int(PCFSAMPLES) + init_offset;
for (int x = init_offset; x < end_offset; x++) {
clampedpos = poissonDisk[x] * texture_size * SOFTSHADOWRADIUS + smTexCoord.xy;
visibility += getHardShadow(shadowsampler, clampedpos.xy, realDistance);
}
return visibility / PCFSAMPLES;
}
#endif
#else
/* poisson filter disabled */
#ifdef COLORED_SHADOWS
vec4 getShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
vec2 clampedpos;
vec4 visibility = vec4(0.0);
float sradius=0.0;
if( PCFBOUND>0)
sradius = SOFTSHADOWRADIUS / PCFBOUND;
float texture_size = 1.0 / (f_textureresolution * 0.5);
float y, x;
// basic PCF filter
for (y = -PCFBOUND; y <= PCFBOUND; y += 1.0)
for (x = -PCFBOUND; x <= PCFBOUND; x += 1.0) {
clampedpos = vec2(x,y) * texture_size* sradius + smTexCoord.xy;
visibility += getHardShadowColor(shadowsampler, clampedpos.xy, realDistance);
}
return visibility / PCFSAMPLES;
}
#else
float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
vec2 clampedpos;
float visibility = 0.0;
float sradius=0.0;
if( PCFBOUND>0)
sradius = SOFTSHADOWRADIUS / PCFBOUND;
float texture_size = 1.0 / (f_textureresolution * 0.5);
float y, x;
// basic PCF filter
for (y = -PCFBOUND; y <= PCFBOUND; y += 1.0)
for (x = -PCFBOUND; x <= PCFBOUND; x += 1.0) {
clampedpos = vec2(x,y) * texture_size * sradius + smTexCoord.xy;
visibility += getHardShadow(shadowsampler, clampedpos.xy, realDistance);
}
return visibility / PCFSAMPLES;
}
#endif
#endif
#endif
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void main(void)
{
vec3 color;
vec2 uv = varTexCoord.st;
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vec4 base = texture2D(baseTexture, uv).rgba;
#ifdef USE_DISCARD
// If alpha is zero, we can just discard the pixel. This fixes transparency
// on GPUs like GC7000L, where GL_ALPHA_TEST is not implemented in mesa,
// and also on GLES 2, where GL_ALPHA_TEST is missing entirely.
if (base.a == 0.0) {
discard;
}
#endif
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color = base.rgb;
vec4 col = vec4(color.rgb, base.a);
col.rgb *= varColor.rgb;
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col.rgb *= emissiveColor.rgb * vIDiff;
#ifdef ENABLE_DYNAMIC_SHADOWS
float shadow_int = 0.0;
vec3 shadow_color = vec3(0.0, 0.0, 0.0);
vec3 posLightSpace = getLightSpacePosition();
#ifdef COLORED_SHADOWS
vec4 visibility = getShadowColor(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
shadow_int = visibility.r;
shadow_color = visibility.gba;
#else
shadow_int = getShadow(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
#endif
if (f_normal_length != 0 && cosLight <= 0.001) {
shadow_int = clamp(shadow_int + 0.5 * abs(cosLight), 0.0, 1.0);
}
shadow_int = 1.0 - (shadow_int * adj_shadow_strength);
col.rgb = mix(shadow_color, col.rgb, shadow_int) * shadow_int;
#endif
#if ENABLE_TONE_MAPPING
col = applyToneMapping(col);
#endif
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// Due to a bug in some (older ?) graphics stacks (possibly in the glsl compiler ?),
// the fog will only be rendered correctly if the last operation before the
// clamp() is an addition. Else, the clamp() seems to be ignored.
// E.g. the following won't work:
// float clarity = clamp(fogShadingParameter
// * (fogDistance - length(eyeVec)) / fogDistance), 0.0, 1.0);
// As additions usually come for free following a multiplication, the new formula
// should be more efficient as well.
// Note: clarity = (1 - fogginess)
float clarity = clamp(fogShadingParameter
- fogShadingParameter * length(eyeVec) / fogDistance, 0.0, 1.0);
col = mix(skyBgColor, col, clarity);
gl_FragColor = vec4(col.rgb, base.a);
}