minetest/client/shaders/shadow_shaders/pass1_trans_vertex.glsl

34 lines
683 B
Plaintext
Raw Normal View History

uniform mat4 LightMVP; // world matrix
varying vec4 tPos;
#ifdef COLORED_SHADOWS
varying vec3 varColor;
#endif
const float bias0 = 0.9;
const float zPersFactor = 0.5;
const float bias1 = 1.0 - bias0 + 1e-6;
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;
}
void main()
{
vec4 pos = LightMVP * gl_Vertex;
tPos = getPerspectiveFactor(LightMVP * gl_Vertex);
gl_Position = vec4(tPos.xyz, 1.0);
gl_TexCoord[0].st = gl_MultiTexCoord0.st;
#ifdef COLORED_SHADOWS
varColor = gl_Color.rgb;
#endif
}