minetest/client/shaders/shadow_shaders/pass1_vertex.glsl
x2048 31578303a4
Tune shadow perspective distortion (#12146)
* Pass perspective distortion parameters as uniforms
* Set all perspective bias parameters via ShadowRenderer
* Recalibrate perspective distortion and shadow range to render less shadow geometry with the same quality and observed shadow distance
2022-03-31 22:40:06 +02:00

27 lines
607 B
GLSL

uniform mat4 LightMVP; // world matrix
varying vec4 tPos;
uniform float xyPerspectiveBias0;
uniform float xyPerspectiveBias1;
uniform float zPerspectiveBias;
vec4 getPerspectiveFactor(in vec4 shadowPosition)
{
float pDistance = length(shadowPosition.xy);
float pFactor = pDistance * xyPerspectiveBias0 + xyPerspectiveBias1;
shadowPosition.xyz *= vec3(vec2(1.0 / pFactor), zPerspectiveBias);
return shadowPosition;
}
void main()
{
vec4 pos = LightMVP * gl_Vertex;
tPos = getPerspectiveFactor(pos);
gl_Position = vec4(tPos.xyz, 1.0);
gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
}