realisticallyOptimized

1#version 120
2 
3varying vec2 vTex;
4varying vec2 vLm;
5varying vec3 vNormal;
6varying vec3 vWorldPos;
7varying vec4 vColor;
8varying float vMatId;
9 
10uniform mat4 gbufferModelViewInverse;
11uniform float frameTimeCounter;
12 
13attribute vec4 mc_Entity;
14 
15float vegetationMask(float id) {
16    float m = 0.0;
17    m += 1.0 - step(0.5, abs(id - 1001.0)); // grass/fern
18    m += 1.0 - step(0.5, abs(id - 1002.0)); // flowers
19    m += 1.0 - step(0.5, abs(id - 1003.0)); // crops
20    m += 1.0 - step(0.5, abs(id - 1004.0)); // leaves
21    return clamp(m, 0.0, 1.0);
22}
23 
24void main() {
25    vec3 pos = gl_Vertex.xyz;
26    float vid = floor(mc_Entity.x + 0.5);
27    float mask = vegetationMask(vid);
28 
29    float gust = sin(frameTimeCounter * 2.2 + pos.x * 0.18 + pos.z * 0.16);
30    float sway = sin(frameTimeCounter * 1.3 + pos.x * 0.09 - pos.z * 0.11);
31    float topPart = smoothstep(0.15, 1.0, gl_MultiTexCoord0.y);
32 
33    pos.x += (gust * 0.05 + sway * 0.03) * mask * topPart;
34    pos.z += (gust * 0.03) * mask * topPart;
35 
36    vec4 viewPos = gl_ModelViewMatrix * vec4(pos, 1.0);
37    gl_Position = gl_ProjectionMatrix * viewPos;
38 
39    vTex = gl_MultiTexCoord0.xy;
40    vLm = (gl_TextureMatrix[1] * gl_MultiTexCoord1).xy;
41    vNormal = normalize(gl_NormalMatrix * gl_Normal);
42    vWorldPos = (gbufferModelViewInverse * viewPos).xyz;
43    vColor = gl_Color;
44    vMatId = vid;
45}
46