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Implement shadow offsets for the new SM distortion function (#12191)

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* Move shadow position calculation to vertex shaders
* Animate entire scene before rendering shadows to prevent lagging of shadows
* Remove unnecessary use of PolygonOffsetFactor
* Apply normal offset to both nodes and objects
* Rename getPerspectiveFactor -> applyPerspectiveDistortion
* Remove perspective distortion from fragment shaders
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x2048 2022-04-14 22:49:30 +02:00 • committed by GitHub
parent 9aabd911eb
commit a5d29fa1d4
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9 changed files with 184 additions and 122 deletions
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36
client/shaders/nodes_shader/opengl_fragment.glsl
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@ -18,10 +18,13 @@ uniform float animationTimer;
uniform float f_shadowfar;
uniform float f_shadow_strength;
uniform vec4 CameraPos;
varying float normalOffsetScale;
uniform float xyPerspectiveBias0;
uniform float xyPerspectiveBias1;
varying float adj_shadow_strength;
varying float cosLight;
varying float f_normal_length;
varying vec3 shadow_position;
#endif
@ -45,24 +48,7 @@ varying float nightRatio;
const float fogStart = FOG_START;
const float fogShadingParameter = 1.0 / ( 1.0 - fogStart);
#ifdef ENABLE_DYNAMIC_SHADOWS
uniform float xyPerspectiveBias0;
uniform float xyPerspectiveBias1;
uniform float zPerspectiveBias;
vec4 getPerspectiveFactor(in vec4 shadowPosition)
{
vec2 s = vec2(shadowPosition.x > CameraPos.x ? 1.0 : -1.0, shadowPosition.y > CameraPos.y ? 1.0 : -1.0);
vec2 l = s * (shadowPosition.xy - CameraPos.xy) / (1.0 - s * CameraPos.xy);
float pDistance = length(l);
float pFactor = pDistance * xyPerspectiveBias0 + xyPerspectiveBias1;
l /= pFactor;
shadowPosition.xy = CameraPos.xy * (1.0 - l) + s * l;
shadowPosition.z *= zPerspectiveBias;
return shadowPosition;
}
// assuming near is always 1.0
float getLinearDepth()
@ -72,15 +58,7 @@ float getLinearDepth()
vec3 getLightSpacePosition()
{
vec4 pLightSpace;
// some drawtypes have zero normals, so we need to handle it :(
#if DRAW_TYPE == NDT_PLANTLIKE
pLightSpace = m_ShadowViewProj * vec4(worldPosition, 1.0);
#else
pLightSpace = m_ShadowViewProj * vec4(worldPosition + normalOffsetScale * normalize(vNormal), 1.0);
#endif
pLightSpace = getPerspectiveFactor(pLightSpace);
return pLightSpace.xyz * 0.5 + 0.5;
return shadow_position * 0.5 + 0.5;
}
// custom smoothstep implementation because it's not defined in glsl1.2
// https://docs.gl/sl4/smoothstep
@ -499,14 +477,14 @@ void main(void)
#ifdef COLORED_SHADOWS
vec4 visibility;
if (cosLight > 0.0)
if (cosLight > 0.0 || f_normal_length < 1e-3)
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)
if (cosLight > 0.0 || f_normal_length < 1e-3)
shadow_int = getShadow(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
else
shadow_int = 1.0;