66 lines
1.9 KiB
GLSL
66 lines
1.9 KiB
GLSL
#version 330 core
|
|
|
|
in vec2 vUV;
|
|
in vec3 vWorldPos;
|
|
out vec4 FragColor;
|
|
|
|
uniform sampler2D uHeightTex;
|
|
uniform float uMinV;
|
|
uniform float uMaxV;
|
|
uniform float uHeightScale;
|
|
uniform vec2 uTexelSize;
|
|
uniform vec2 uPlaneSize;
|
|
uniform vec3 uCameraPos;
|
|
uniform vec3 uLightDir;
|
|
|
|
float saturate(float x) { return clamp(x, 0.0, 1.0); }
|
|
|
|
float value01(float v) {
|
|
return saturate((v - uMinV) / max(uMaxV - uMinV, 1e-6));
|
|
}
|
|
|
|
vec3 colorRamp(float t) {
|
|
t = saturate(t);
|
|
vec3 c0 = vec3(0.10, 0.15, 0.85);
|
|
vec3 c1 = vec3(0.05, 0.75, 0.95);
|
|
vec3 c2 = vec3(0.10, 0.90, 0.35);
|
|
vec3 c3 = vec3(0.95, 0.90, 0.20);
|
|
vec3 c4 = vec3(0.95, 0.25, 0.12);
|
|
if (t < 0.25) return mix(c0, c1, t / 0.25);
|
|
if (t < 0.50) return mix(c1, c2, (t - 0.25) / 0.25);
|
|
if (t < 0.75) return mix(c2, c3, (t - 0.50) / 0.25);
|
|
return mix(c3, c4, (t - 0.75) / 0.25);
|
|
}
|
|
|
|
void main() {
|
|
float vC = texture(uHeightTex, vUV).r;
|
|
float t = value01(vC);
|
|
vec3 base = colorRamp(t);
|
|
|
|
float vL = texture(uHeightTex, vUV - vec2(uTexelSize.x, 0.0)).r;
|
|
float vR = texture(uHeightTex, vUV + vec2(uTexelSize.x, 0.0)).r;
|
|
float vD = texture(uHeightTex, vUV - vec2(0.0, uTexelSize.y)).r;
|
|
float vU = texture(uHeightTex, vUV + vec2(0.0, uTexelSize.y)).r;
|
|
|
|
float hL = value01(vL) * uHeightScale;
|
|
float hR = value01(vR) * uHeightScale;
|
|
float hD = value01(vD) * uHeightScale;
|
|
float hU = value01(vU) * uHeightScale;
|
|
|
|
float dx = max(1e-6, uPlaneSize.x * uTexelSize.x);
|
|
float dy = max(1e-6, uPlaneSize.y * uTexelSize.y);
|
|
float dHx = (hR - hL) / (2.0 * dx);
|
|
float dHy = (hU - hD) / (2.0 * dy);
|
|
|
|
vec3 N = normalize(vec3(-dHx, -dHy, 1.0));
|
|
vec3 L = normalize(uLightDir);
|
|
vec3 V = normalize(uCameraPos - vWorldPos);
|
|
|
|
float diff = saturate(dot(N, L));
|
|
float spec = pow(saturate(dot(reflect(-L, N), V)), 20.0);
|
|
|
|
vec3 col = base * (0.50 + 0.50 * diff);
|
|
col += vec3(1.0) * spec * 0.20;
|
|
FragColor = vec4(clamp(col, 0.0, 1.0), 1.0);
|
|
}
|