forked from Mirrorlandia_minetest/minetest
Copy shadow mapping shader from nodes to objects
This commit is contained in:
Dmitry Kostenko
x2048
parent
4e39cdef94
commit
10be033791
@ -1,6 +1,7 @@
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uniform sampler2D baseTexture;
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uniform vec4 emissiveColor;
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uniform vec3 dayLight;
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uniform vec4 skyBgColor;
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uniform float fogDistance;
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uniform vec3 eyePosition;
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@ -16,6 +17,8 @@ centroid varying vec2 varTexCoord;
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#endif
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varying vec3 eyeVec;
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varying float nightRatio;
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varying float vIDiff;
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const float e = 2.718281828459;
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@ -31,53 +34,23 @@ const float fogShadingParameter = 1.0 / (1.0 - fogStart);
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uniform float f_textureresolution;
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uniform mat4 m_ShadowViewProj;
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uniform float f_shadowfar;
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uniform float f_timeofday;
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varying float normalOffsetScale;
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varying float adj_shadow_strength;
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varying float cosLight;
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varying float f_normal_length;
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#endif
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#if ENABLE_TONE_MAPPING
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/* Hable's UC2 Tone mapping parameters
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A = 0.22;
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B = 0.30;
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C = 0.10;
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D = 0.20;
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E = 0.01;
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F = 0.30;
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W = 11.2;
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equation used: ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
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*/
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vec3 uncharted2Tonemap(vec3 x)
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{
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return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
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}
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vec4 applyToneMapping(vec4 color)
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{
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color = vec4(pow(color.rgb, vec3(2.2)), color.a);
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const float gamma = 1.6;
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const float exposureBias = 5.5;
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color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
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// Precalculated white_scale from
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//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
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vec3 whiteScale = vec3(1.036015346);
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color.rgb *= whiteScale;
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return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
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}
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#endif
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#ifdef ENABLE_DYNAMIC_SHADOWS
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const float bias0 = 0.9;
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const float zPersFactor = 0.5;
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const float bias1 = 1.0 - bias0;
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const float bias1 = 1.0 - bias0 + 1e-6;
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vec4 getPerspectiveFactor(in vec4 shadowPosition)
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{
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float pDistance = length(shadowPosition.xy);
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float pFactor = pDistance * bias0 + bias1;
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shadowPosition.xyz *= vec3(vec2(1.0 / pFactor), zPersFactor);
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return shadowPosition;
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@ -92,11 +65,23 @@ float getLinearDepth()
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vec3 getLightSpacePosition()
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{
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vec4 pLightSpace;
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float normalBias = 0.0005 * getLinearDepth() * cosLight + normalOffsetScale;
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pLightSpace = m_ShadowViewProj * vec4(worldPosition + normalBias * normalize(vNormal), 1.0);
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// some drawtypes have zero normals, so we need to handle it :(
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#if DRAW_TYPE == NDT_PLANTLIKE
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pLightSpace = m_ShadowViewProj * vec4(worldPosition, 1.0);
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#else
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float offsetScale = (0.0057 * getLinearDepth() + normalOffsetScale);
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pLightSpace = m_ShadowViewProj * vec4(worldPosition + offsetScale * normalize(vNormal), 1.0);
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#endif
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pLightSpace = getPerspectiveFactor(pLightSpace);
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return pLightSpace.xyz * 0.5 + 0.5;
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}
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// custom smoothstep implementation because it's not defined in glsl1.2
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// https://docs.gl/sl4/smoothstep
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float mtsmoothstep(in float edge0, in float edge1, in float x)
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{
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float t = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);
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return t * t * (3.0 - 2.0 * t);
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}
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#ifdef COLORED_SHADOWS
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@ -124,10 +109,10 @@ vec4 getHardShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDist
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{
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vec4 texDepth = texture2D(shadowsampler, smTexCoord.xy).rgba;
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float visibility = step(0.0, (realDistance-2e-5) - texDepth.r);
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float visibility = step(0.0, realDistance - texDepth.r);
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vec4 result = vec4(visibility, vec3(0.0,0.0,0.0));//unpackColor(texDepth.g));
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if (visibility < 0.1) {
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visibility = step(0.0, (realDistance-2e-5) - texDepth.r);
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visibility = step(0.0, realDistance - texDepth.b);
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result = vec4(visibility, unpackColor(texDepth.a));
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}
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return result;
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@ -138,13 +123,13 @@ vec4 getHardShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDist
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float getHardShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
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{
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float texDepth = texture2D(shadowsampler, smTexCoord.xy).r;
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float visibility = step(0.0, (realDistance-2e-5) - texDepth);
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float visibility = step(0.0, realDistance - texDepth);
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return visibility;
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}
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#endif
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#if SHADOW_FILTER == 2
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#define PCFBOUND 3.5
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#define PCFSAMPLES 64.0
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@ -163,6 +148,73 @@ float getHardShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance
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#define PCFSAMPLES 1.0
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#endif
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#endif
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#ifdef COLORED_SHADOWS
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float getHardShadowDepth(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
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{
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vec4 texDepth = texture2D(shadowsampler, smTexCoord.xy);
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float depth = max(realDistance - texDepth.r, realDistance - texDepth.b);
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return depth;
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}
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#else
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float getHardShadowDepth(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
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{
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float texDepth = texture2D(shadowsampler, smTexCoord.xy).r;
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float depth = realDistance - texDepth;
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return depth;
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}
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#endif
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float getBaseLength(vec2 smTexCoord)
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{
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float l = length(2.0 * smTexCoord.xy - 1.0); // length in texture coords
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return bias1 / (1.0 / l - bias0); // return to undistorted coords
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}
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float getDeltaPerspectiveFactor(float l)
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{
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return 0.1 / (bias0 * l + bias1); // original distortion factor, divided by 10
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}
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float getPenumbraRadius(sampler2D shadowsampler, vec2 smTexCoord, float realDistance, float multiplier)
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{
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float baseLength = getBaseLength(smTexCoord);
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float perspectiveFactor;
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// Return fast if sharp shadows are requested
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if (SOFTSHADOWRADIUS <= 1.0) {
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perspectiveFactor = getDeltaPerspectiveFactor(baseLength);
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return max(2 * length(smTexCoord.xy) * 2048 / f_textureresolution / pow(perspectiveFactor, 3), SOFTSHADOWRADIUS);
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}
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vec2 clampedpos;
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float texture_size = 1.0 / (2048 /*f_textureresolution*/ * 0.5);
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float y, x;
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float depth = 0.0;
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float pointDepth;
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float maxRadius = SOFTSHADOWRADIUS * 5.0 * multiplier;
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float bound = clamp(PCFBOUND * (1 - baseLength), 0.0, PCFBOUND);
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int n = 0;
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for (y = -bound; y <= bound; y += 1.0)
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for (x = -bound; x <= bound; x += 1.0) {
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clampedpos = vec2(x,y);
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perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * maxRadius);
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clampedpos = clampedpos * texture_size * perspectiveFactor * maxRadius * perspectiveFactor + smTexCoord.xy;
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pointDepth = getHardShadowDepth(shadowsampler, clampedpos.xy, realDistance);
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if (pointDepth > -0.01) {
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depth += pointDepth;
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n += 1;
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}
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}
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depth = depth / n;
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depth = pow(clamp(depth, 0.0, 1000.0), 1.6) / 0.001;
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perspectiveFactor = getDeltaPerspectiveFactor(baseLength);
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return max(length(smTexCoord.xy) * 2 * 2048 / f_textureresolution / pow(perspectiveFactor, 3), depth * maxRadius);
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}
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#ifdef POISSON_FILTER
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const vec2[64] poissonDisk = vec2[64](
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@ -238,17 +290,28 @@ vec4 getShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDistance
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{
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vec2 clampedpos;
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vec4 visibility = vec4(0.0);
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float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance, 1.5); // scale to align with PCF
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if (radius < 0.1) {
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// we are in the middle of even brightness, no need for filtering
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return getHardShadowColor(shadowsampler, smTexCoord.xy, realDistance);
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}
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float baseLength = getBaseLength(smTexCoord);
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float perspectiveFactor;
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float texture_size = 1.0 / (f_textureresolution * 0.5);
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int init_offset = int(floor(mod(((smTexCoord.x * 34.0) + 1.0) * smTexCoord.y, 64.0-PCFSAMPLES)));
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int end_offset = int(PCFSAMPLES) + init_offset;
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int samples = int(clamp(PCFSAMPLES * (1 - baseLength) * (1 - baseLength), PCFSAMPLES / 4, PCFSAMPLES));
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int init_offset = int(floor(mod(((smTexCoord.x * 34.0) + 1.0) * smTexCoord.y, 64.0-samples)));
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int end_offset = int(samples) + init_offset;
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for (int x = init_offset; x < end_offset; x++) {
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clampedpos = poissonDisk[x] * texture_size * SOFTSHADOWRADIUS + smTexCoord.xy;
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clampedpos = poissonDisk[x];
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perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * radius);
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clampedpos = clampedpos * texture_size * perspectiveFactor * radius * perspectiveFactor + smTexCoord.xy;
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visibility += getHardShadowColor(shadowsampler, clampedpos.xy, realDistance);
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}
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return visibility / PCFSAMPLES;
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return visibility / samples;
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}
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#else
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@ -257,17 +320,28 @@ float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
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{
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vec2 clampedpos;
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float visibility = 0.0;
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float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance, 1.5); // scale to align with PCF
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if (radius < 0.1) {
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// we are in the middle of even brightness, no need for filtering
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return getHardShadow(shadowsampler, smTexCoord.xy, realDistance);
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}
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float baseLength = getBaseLength(smTexCoord);
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float perspectiveFactor;
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float texture_size = 1.0 / (f_textureresolution * 0.5);
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int init_offset = int(floor(mod(((smTexCoord.x * 34.0) + 1.0) * smTexCoord.y, 64.0-PCFSAMPLES)));
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int end_offset = int(PCFSAMPLES) + init_offset;
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int samples = int(clamp(PCFSAMPLES * (1 - baseLength) * (1 - baseLength), PCFSAMPLES / 4, PCFSAMPLES));
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int init_offset = int(floor(mod(((smTexCoord.x * 34.0) + 1.0) * smTexCoord.y, 64.0-samples)));
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int end_offset = int(samples) + init_offset;
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for (int x = init_offset; x < end_offset; x++) {
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clampedpos = poissonDisk[x] * texture_size * SOFTSHADOWRADIUS + smTexCoord.xy;
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clampedpos = poissonDisk[x];
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perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * radius);
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clampedpos = clampedpos * texture_size * perspectiveFactor * radius * perspectiveFactor + smTexCoord.xy;
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visibility += getHardShadow(shadowsampler, clampedpos.xy, realDistance);
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}
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return visibility / PCFSAMPLES;
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return visibility / samples;
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}
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#endif
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@ -281,19 +355,31 @@ vec4 getShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDistance
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{
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vec2 clampedpos;
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vec4 visibility = vec4(0.0);
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float sradius=0.0;
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if( PCFBOUND>0)
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sradius = SOFTSHADOWRADIUS / PCFBOUND;
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float texture_size = 1.0 / (f_textureresolution * 0.5);
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float y, x;
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// basic PCF filter
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for (y = -PCFBOUND; y <= PCFBOUND; y += 1.0)
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for (x = -PCFBOUND; x <= PCFBOUND; x += 1.0) {
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clampedpos = vec2(x,y) * texture_size* sradius + smTexCoord.xy;
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visibility += getHardShadowColor(shadowsampler, clampedpos.xy, realDistance);
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float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance, 1.0);
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if (radius < 0.1) {
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// we are in the middle of even brightness, no need for filtering
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return getHardShadowColor(shadowsampler, smTexCoord.xy, realDistance);
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}
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return visibility / PCFSAMPLES;
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float baseLength = getBaseLength(smTexCoord);
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float perspectiveFactor;
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float texture_size = 1.0 / (f_textureresolution * 0.5);
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float y, x;
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float bound = clamp(PCFBOUND * (1 - baseLength), PCFBOUND / 2, PCFBOUND);
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int n = 0;
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// basic PCF filter
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for (y = -bound; y <= bound; y += 1.0)
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for (x = -bound; x <= bound; x += 1.0) {
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clampedpos = vec2(x,y); // screen offset
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perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * radius / bound);
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clampedpos = clampedpos * texture_size * perspectiveFactor * radius * perspectiveFactor / bound + smTexCoord.xy; // both dx,dy and radius are adjusted
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visibility += getHardShadowColor(shadowsampler, clampedpos.xy, realDistance);
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n += 1;
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}
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return visibility / n;
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}
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#else
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@ -301,20 +387,31 @@ float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
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{
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vec2 clampedpos;
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float visibility = 0.0;
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float sradius=0.0;
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if( PCFBOUND>0)
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sradius = SOFTSHADOWRADIUS / PCFBOUND;
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float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance, 1.0);
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if (radius < 0.1) {
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// we are in the middle of even brightness, no need for filtering
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return getHardShadow(shadowsampler, smTexCoord.xy, realDistance);
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}
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float baseLength = getBaseLength(smTexCoord);
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float perspectiveFactor;
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float texture_size = 1.0 / (f_textureresolution * 0.5);
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float y, x;
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float bound = clamp(PCFBOUND * (1 - baseLength), PCFBOUND / 2, PCFBOUND);
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int n = 0;
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// basic PCF filter
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for (y = -PCFBOUND; y <= PCFBOUND; y += 1.0)
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for (x = -PCFBOUND; x <= PCFBOUND; x += 1.0) {
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clampedpos = vec2(x,y) * texture_size * sradius + smTexCoord.xy;
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for (y = -bound; y <= bound; y += 1.0)
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for (x = -bound; x <= bound; x += 1.0) {
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clampedpos = vec2(x,y); // screen offset
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perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * radius / bound);
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clampedpos = clampedpos * texture_size * perspectiveFactor * radius * perspectiveFactor / bound + smTexCoord.xy; // both dx,dy and radius are adjusted
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visibility += getHardShadow(shadowsampler, clampedpos.xy, realDistance);
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n += 1;
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}
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return visibility / PCFSAMPLES;
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return visibility / n;
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}
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#endif
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@ -322,6 +419,37 @@ float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
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#endif
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#endif
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#if ENABLE_TONE_MAPPING
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/* Hable's UC2 Tone mapping parameters
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A = 0.22;
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B = 0.30;
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C = 0.10;
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D = 0.20;
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E = 0.01;
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F = 0.30;
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W = 11.2;
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equation used: ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
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*/
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vec3 uncharted2Tonemap(vec3 x)
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{
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return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
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}
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vec4 applyToneMapping(vec4 color)
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{
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color = vec4(pow(color.rgb, vec3(2.2)), color.a);
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const float gamma = 1.6;
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const float exposureBias = 5.5;
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color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
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// Precalculated white_scale from
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//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
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vec3 whiteScale = vec3(1.036015346);
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color.rgb *= whiteScale;
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return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
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}
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#endif
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void main(void)
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{
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vec3 color;
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@ -350,29 +478,51 @@ void main(void)
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vec3 shadow_color = vec3(0.0, 0.0, 0.0);
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vec3 posLightSpace = getLightSpacePosition();
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#ifdef COLORED_SHADOWS
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vec4 visibility;
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if (cosLight > 0.0)
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visibility = getShadowColor(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
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else
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visibility = vec4(1.0, 0.0, 0.0, 0.0);
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shadow_int = visibility.r;
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shadow_color = visibility.gba;
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#else
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shadow_int = getShadow(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
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#endif
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float distance_rate = (1 - pow(clamp(2.0 * length(posLightSpace.xy - 0.5),0.0,1.0), 20.0));
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float f_adj_shadow_strength = max(adj_shadow_strength-mtsmoothstep(0.9,1.1, posLightSpace.z ),0.0);
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if (distance_rate > 1e-7) {
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#ifdef COLORED_SHADOWS
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vec4 visibility;
|
||||
if (cosLight > 0.0)
|
||||
visibility = getShadowColor(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
|
||||
else
|
||||
visibility = vec4(1.0, 0.0, 0.0, 0.0);
|
||||
shadow_int = visibility.r;
|
||||
shadow_color = visibility.gba;
|
||||
#else
|
||||
if (cosLight > 0.0)
|
||||
shadow_int = getShadow(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
|
||||
else
|
||||
shadow_int = 1.0;
|
||||
#endif
|
||||
shadow_int *= distance_rate;
|
||||
shadow_int = clamp(shadow_int, 0.0, 1.0);
|
||||
|
||||
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);
|
||||
// turns out that nightRatio falls off much faster than
|
||||
// actual brightness of artificial light in relation to natual light.
|
||||
// Power ratio was measured on torches in MTG (brightness = 14).
|
||||
float adjusted_night_ratio = pow(nightRatio, 0.6);
|
||||
|
||||
col.rgb = mix(shadow_color, col.rgb, shadow_int) * shadow_int;
|
||||
if (f_normal_length != 0 && cosLight < 0.035) {
|
||||
shadow_int = max(shadow_int, 1 - clamp(cosLight, 0.0, 0.035)/0.035);
|
||||
}
|
||||
|
||||
shadow_int *= f_adj_shadow_strength;
|
||||
|
||||
// calculate fragment color from components:
|
||||
col.rgb =
|
||||
adjusted_night_ratio * col.rgb + // artificial light
|
||||
(1.0 - adjusted_night_ratio) * ( // natural light
|
||||
col.rgb * (1.0 - shadow_int * (1.0 - shadow_color)) + // filtered texture color
|
||||
dayLight * shadow_color * shadow_int); // reflected filtered sunlight/moonlight
|
||||
// col.r = 0.5 * clamp(getPenumbraRadius(ShadowMapSampler, posLightSpace.xy, posLightSpace.z, 1.0) / SOFTSHADOWRADIUS, 0.0, 1.0) + 0.5 * col.r;
|
||||
// col.r = adjusted_night_ratio; // debug night ratio adjustment
|
||||
#endif
|
||||
|
||||
|
||||
|
||||
#if ENABLE_TONE_MAPPING
|
||||
col = applyToneMapping(col);
|
||||
#endif
|
||||
|
||||
@ -28,6 +28,8 @@ centroid varying vec2 varTexCoord;
|
||||
#endif
|
||||
|
||||
varying vec3 eyeVec;
|
||||
varying float nightRatio;
|
||||
|
||||
varying float vIDiff;
|
||||
|
||||
const float e = 2.718281828459;
|
||||
@ -60,7 +62,7 @@ void main(void)
|
||||
gl_Position = mWorldViewProj * inVertexPosition;
|
||||
|
||||
vPosition = gl_Position.xyz;
|
||||
vNormal = inVertexNormal;
|
||||
vNormal = (mWorld * vec4(inVertexNormal, 0.0)).xyz;
|
||||
worldPosition = (mWorld * inVertexPosition).xyz;
|
||||
eyeVec = -(mWorldView * inVertexPosition).xyz;
|
||||
|
||||
@ -73,6 +75,7 @@ void main(void)
|
||||
? 1.0
|
||||
: directional_ambient(normalize(inVertexNormal));
|
||||
#endif
|
||||
nightRatio = 0.0;
|
||||
|
||||
#ifdef GL_ES
|
||||
varColor = inVertexColor.bgra;
|
||||
@ -81,11 +84,12 @@ void main(void)
|
||||
#endif
|
||||
|
||||
#ifdef ENABLE_DYNAMIC_SHADOWS
|
||||
|
||||
cosLight = max(0.0, dot(vNormal, -v_LightDirection));
|
||||
float texelSize = 0.51;
|
||||
float slopeScale = clamp(1.0 - cosLight, 0.0, 1.0);
|
||||
vec3 nNormal = normalize(vNormal);
|
||||
cosLight = dot(nNormal, -v_LightDirection);
|
||||
float texelSize = 767.0 / f_textureresolution;
|
||||
float slopeScale = clamp(1.0 - abs(cosLight), 0.0, 1.0);
|
||||
normalOffsetScale = texelSize * slopeScale;
|
||||
|
||||
if (f_timeofday < 0.2) {
|
||||
adj_shadow_strength = f_shadow_strength * 0.5 *
|
||||
(1.0 - mtsmoothstep(0.18, 0.2, f_timeofday));
|
||||
@ -98,6 +102,5 @@ void main(void)
|
||||
(1.0 - mtsmoothstep(0.7, 0.8, f_timeofday));
|
||||
}
|
||||
f_normal_length = length(vNormal);
|
||||
|
||||
#endif
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user