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Updated water shader to support more settings (specular strength and reflection tint).

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This was SVN commit r4317.
This commit is contained in:
Matei 2006-09-10 05:30:49 +00:00
parent aa50820d9a
commit 222d90727e
1 changed files with 22 additions and 17 deletions
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39
binaries/data/mods/official/shaders/water_high.fs
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@ -5,27 +5,28 @@ uniform vec3 cameraPos;
uniform sampler2D normalMap;
uniform sampler2D reflectionMap;
uniform sampler2D refractionMap;
uniform float shininess;
uniform float waviness;
uniform vec3 tint;
uniform float murkiness;
uniform float fullDepth;
uniform float shininess; // Blinn-Phong specular strength
uniform float specularStrength; // Scaling for specular reflection (specular color is (this,this,this))
uniform float waviness; // "Wildness" of the reflections and refractions; choose based on texture
uniform vec3 tint; // Tint for refraction (used to simulate particles in water)
uniform float murkiness; // Amount of tint to blend in with the refracted colour
uniform float fullDepth; // Depth at which to use full murkiness (shallower water will be clearer)
uniform vec3 reflectionTint; // Tint for reflection (used for really muddy water)
uniform float reflectionTintStrength; // Strength of reflection tint (how much of it to mix in)
varying vec3 worldPos;
varying float w;
varying float waterDepth;
varying float losMod;
const vec3 specularColor = vec3(0.15, 0.15, 0.15);
void main()
{
vec3 n, l, h, v; // Normal, light vector, half-vector and view vector (vector to eye)
float ndotl, ndoth, ndotv;
float fresnel;
float myMurkiness; // Murkiness and tint at this pixel (tweaked based on lighting and depth)
vec3 myTint;
float t;
vec3 diffuse; // Diffuse colour at this pixel (ambient + diffuse terms)
float t; // Temporary variable
vec2 reflCoords, refrCoords;
vec3 reflColor, refrColor, specular;
@ -38,21 +39,25 @@ void main()
ndoth = dot(n, h);
ndotv = dot(n, v);
fresnel = pow(1.0 - ndotv, 0.8); // A rather random Fresnel approximation
diffuse = ambient + ndotl * sunColor;
reflCoords = 0.5 * (gl_TexCoord[1].xy / gl_TexCoord[1].w) + 0.5; // Unbias texture coords
reflCoords += waviness * n.xz / w;
myMurkiness = murkiness * min(waterDepth / fullDepth, 1.0);
fresnel = pow(1.0 - ndotv, 0.8); // A rather random Fresnel approximation
refrCoords = 0.5 * (gl_TexCoord[2].xy / gl_TexCoord[2].w) + 0.5; // Unbias texture coords
refrCoords -= 0.8 * waviness * n.xz / w; // Refractions can be slightly less wavy
reflColor = texture2D(reflectionMap, reflCoords).rgb;
reflCoords = 0.5 * (gl_TexCoord[1].xy / gl_TexCoord[1].w) + 0.5; // Unbias texture coords
reflCoords += waviness * n.xz / w;
myMurkiness = murkiness * min(waterDepth / fullDepth, 1.0);
myTint = (ambient + ndotl * sunColor) * tint;
refrColor = (0.6 + 0.4*ndotl) * mix(texture2D(refractionMap, refrCoords).rgb, myTint, myMurkiness);
reflColor = mix(texture2D(reflectionMap, reflCoords).rgb, diffuse * reflectionTint,
reflectionTintStrength);
specular = pow(max(0.0, ndoth), shininess) * sunColor * specularColor;
refrColor = mix((0.6 + 0.4*ndotl) * texture2D(refractionMap, refrCoords).rgb, diffuse * tint,
myMurkiness);
specular = pow(max(0.0, ndoth), shininess) * sunColor * specularStrength;
gl_FragColor.rgb = mix(refrColor + 0.3*specular, reflColor + specular, fresnel) * losMod;