diff options
Diffstat (limited to 'gfx/gl/shaders/landmassShader.fs')
| -rw-r--r-- | gfx/gl/shaders/landmassShader.fs | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/gfx/gl/shaders/landmassShader.fs b/gfx/gl/shaders/landmassShader.fs index 36cc971..55c30ac 100644 --- a/gfx/gl/shaders/landmassShader.fs +++ b/gfx/gl/shaders/landmassShader.fs @@ -13,27 +13,23 @@ const vec3 grass = vec3(.1, .4, .05); const vec3 sand = vec3(.76, .7, .5);
const vec3 snow = vec3(.97, .97, .99);
-vec2
-grad_between(float x, float lower, float upper)
-{
- float off = (x - lower) / (upper - lower);
- return vec2(off, 1 - off);
-}
+const float beachline = .5;
+const float snowline_low = 28;
+const float snowline_high = 30;
void
main()
{
gl_FragColor = texture(sampler, texCoord0);
- gl_FragColor.xyz *= clamp(ambientColor + (dot(-lightDirection, normal0) * lightColor), 0.0, 1.0);
- if (height < 0.5) {
+ gl_FragColor.rgb *= clamp(ambientColor + (dot(-lightDirection, normal0) * lightColor), 0.0, 1.0);
+ if (height < beachline) {
gl_FragColor.rgb *= sand;
}
- else if (height > 30) {
+ else if (height > snowline_high) {
gl_FragColor.rgb *= snow;
}
- else if (height > 28) {
- vec2 grad = grad_between(height, 28, 30);
- gl_FragColor.rgb *= grass + (snow - grass) * grad.x;
+ else if (height > snowline_low) {
+ gl_FragColor.rgb *= mix(grass, snow, (height - snowline_low) / (snowline_high - snowline_low));
}
else {
gl_FragColor.rgb *= grass;
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