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Update shader to react to global weather conditions

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Vivian Meazza 2011-09-22 14:37:32 +01:00
parent 9808ca5616
commit 980c1d7926
1 changed files with 37 additions and 30 deletions
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67
Shaders/transition.frag
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@ -7,16 +7,16 @@ varying vec4 diffuse_term, RawPos;
varying vec3 Vnormal, normal; varying vec3 Vnormal, normal;
varying float fogCoord; varying float fogCoord;
uniform float SnowLevel, Transitions, InverseSlope, RainNorm; uniform float SnowLevel, Transitions, InverseSlope, RainNorm, CloudCover0, CloudCover1, CloudCover2, CloudCover3, CloudCover4;
uniform sampler2D BaseTex, SecondTex, ThirdTex, SnowTex; uniform sampler2D BaseTex, SecondTex, ThirdTex, SnowTex;
uniform sampler3D NoiseTex; uniform sampler3D NoiseTex;
void main() void main()
{ {
float MixFactor, NdotL, NdotHV, fogFactor, slope, L1, L2, wetness; float MixFactor, NdotL, NdotHV, fogFactor, cover, slope, L1, L2, wetness;
vec3 n, lightDir, halfVector; vec3 n, lightDir, halfVector;
vec4 texel, fragColor, color, specular, Noise; // GNoise; vec4 texel, fragColor, color, specular, Noise;
lightDir = gl_LightSource[0].position.xyz; lightDir = gl_LightSource[0].position.xyz;
halfVector = gl_LightSource[0].halfVector.xyz; halfVector = gl_LightSource[0].halfVector.xyz;
@ -24,14 +24,14 @@ void main()
color = gl_Color; color = gl_Color;
specular = vec4(0.0); specular = vec4(0.0);
Noise = texture3D(NoiseTex, RawPos.xyz*0.0011); cover = min(min(min(min(CloudCover0, CloudCover1),CloudCover2),CloudCover3),CloudCover4);
//GNoise = texture3D(NoiseTex, RawPos.xyz*0.00011);
Noise = texture3D(NoiseTex, RawPos.xyz*0.0011);
MixFactor = Noise.r * Noise.g * Noise.b; //Mixing Factor to create a more organic looking boundary MixFactor = Noise.r * Noise.g * Noise.b; //Mixing Factor to create a more organic looking boundary
//AddedNoise = GNoise.r * GNoise.g * GNoise.b; //Some added Noise to break the evenness on some textures MixFactor *= 300;
MixFactor *= 50.0; MixFactor = clamp(MixFactor, 0.0, 1.0);
L1 = 0.88 - 0.04 * MixFactor; //first transition slope L1 = 0.90 - 0.02 * MixFactor; //first transition slope
L2 = 0.80 + 0.04 * MixFactor; //Second transition slope L2 = 0.78 + 0.04 * MixFactor; //Second transition slope
// If gl_Color.a == 0, this is a back-facing polygon and the // If gl_Color.a == 0, this is a back-facing polygon and the
// Vnormal should be reversed. // Vnormal should be reversed.
@ -62,22 +62,23 @@ void main()
if (InverseSlope == 0.0) { if (InverseSlope == 0.0) {
//Do we do an intermediate transition //Do we do an intermediate transition
if (Transitions >= 1.5) { if (Transitions >= 1.5) {
if (slope > L1) { if (slope >= L1) {
texel = mix(texture2D(SecondTex, gl_TexCoord[0].st), texture2D(BaseTex, gl_TexCoord[0].st), smoothstep(L1, L1 + 0.003*MixFactor, slope)); //texel = mix(texture2D(SecondTex, gl_TexCoord[0].st), texture2D(BaseTex, gl_TexCoord[0].st), smoothstep(L1, L1 + 0.03 * MixFactor, slope));
texel = texture2D(BaseTex, gl_TexCoord[0].st);
} }
if (slope > L2 && slope <= L1){ if (slope >= L2 && slope < L1){
texel = mix(texture2D(SecondTex, gl_TexCoord[0].st), texture2D(BaseTex, gl_TexCoord[0].st), smoothstep(L2 + 0.01 * MixFactor, L1, slope)); texel = mix(texture2D(SecondTex, gl_TexCoord[0].st), texture2D(BaseTex, gl_TexCoord[0].st), smoothstep(L2, L1 - 0.06 * MixFactor, slope));
} }
if (slope <= L2){ if (slope < L2){
texel = mix(texture2D(ThirdTex, gl_TexCoord[0].st), texture2D(SecondTex, gl_TexCoord[0].st), smoothstep(L2 - 0.1 * MixFactor, L2, slope)); texel = mix(texture2D(ThirdTex, gl_TexCoord[0].st), texture2D(SecondTex, gl_TexCoord[0].st), smoothstep(L2 - 0.13 * MixFactor, L2, slope));
} }
// Just one transition // Just one transition
} else if (Transitions < 1.5) { } else if (Transitions < 1.5) {
if (slope > L1) { if (slope >= L1) {
texel = texture2D(BaseTex, gl_TexCoord[0].st); texel = texture2D(BaseTex, gl_TexCoord[0].st);
} }
if (slope <= L1) { if (slope < L1) {
texel = mix(texture2D(ThirdTex, gl_TexCoord[0].st), texture2D(BaseTex, gl_TexCoord[0].st), smoothstep(L2 - 0.1 * MixFactor, L1, slope)); texel = mix(texture2D(ThirdTex, gl_TexCoord[0].st), texture2D(BaseTex, gl_TexCoord[0].st), smoothstep(L2 - 0.13 * MixFactor, L1, slope));
} }
} }
@ -85,22 +86,22 @@ void main()
} else if (InverseSlope > 0.0) { } else if (InverseSlope > 0.0) {
//Interemdiate transition ? //Interemdiate transition ?
if (Transitions >= 1.5) { if (Transitions >= 1.5) {
if (slope > L1 + 0.16) { if (slope >= L1 + 0.1) {
texel = texture2D(ThirdTex, gl_TexCoord[0].st); texel = texture2D(ThirdTex, gl_TexCoord[0].st);
} }
if (slope > L2 && slope <= L1 + 0.16){ if (slope >= L2 && slope < L1 + 0.1){
texel = mix(texture2D(SecondTex, gl_TexCoord[0].st), texture2D(ThirdTex, gl_TexCoord[0].st), smoothstep(L2 + 0.01 * MixFactor, L1, slope)); texel = mix(texture2D(SecondTex, gl_TexCoord[0].st), texture2D(ThirdTex, gl_TexCoord[0].st), smoothstep(L2 + 0.06 * MixFactor, L1 + 0.1, slope));
} }
if (slope <= L2){ if (slope <= L2){
texel = mix(texture2D(BaseTex, gl_TexCoord[0].st), texture2D(SecondTex, gl_TexCoord[0].st), smoothstep(L2 - 0.05 * MixFactor, L2, slope)); texel = mix(texture2D(BaseTex, gl_TexCoord[0].st), texture2D(SecondTex, gl_TexCoord[0].st), smoothstep(L2 - 0.06 * MixFactor, L2, slope));
} }
//just one //just one
} else if (Transitions < 1.5) { } else if (Transitions < 1.5) {
if (slope > L1 + 0.16) { if (slope > L1 + 0.1) {
texel = texture2D(ThirdTex, gl_TexCoord[0].st); texel = texture2D(ThirdTex, gl_TexCoord[0].st);
} }
if (slope <= L1 + 0.16){ if (slope <= L1 + 0.1){
texel = mix(texture2D(BaseTex, gl_TexCoord[0].st), texture2D(ThirdTex, gl_TexCoord[0].st), smoothstep(L2 - 0.05 * MixFactor, L1 + 0.16, slope)); texel = mix(texture2D(BaseTex, gl_TexCoord[0].st), texture2D(ThirdTex, gl_TexCoord[0].st), smoothstep(L2 - 0.06 * MixFactor, L1 + 0.1, slope));
} }
} }
} }
@ -108,17 +109,23 @@ void main()
//darken textures with wetness //darken textures with wetness
wetness = 1.0 - 0.3 * RainNorm; wetness = 1.0 - 0.3 * RainNorm;
texel.rgb = texel.rgb * wetness; texel.rgb = texel.rgb * wetness;
//texel.r = texel.r * wetness;
//texel.g = texel.g * wetness;
//texel.b = texel.b * wetness;
//Snow texture for areas higher than SnowLevel //Snow texture for areas higher than SnowLevel
if (RawPos.z >= SnowLevel - 6000.0 * MixFactor && slope > L2 - 0.4) { if (RawPos.z >= SnowLevel - (1000.0 * slope + 300 * MixFactor) && slope > L2 - 0.12) {
texel = mix(texel, mix(texel, texture2D(SnowTex, gl_TexCoord[0].st), smoothstep(L2 - 0.4 * MixFactor, L2, slope)), smoothstep(SnowLevel - 6000.0 * slope * MixFactor, SnowLevel - 1400.0 * slope * MixFactor, RawPos.z)); texel = mix(texel, mix(texel, texture2D(SnowTex, gl_TexCoord[0].st * 2), smoothstep(L2 - 0.09 * MixFactor, L2, slope)), smoothstep(SnowLevel - (1000.0 * slope + 300 * MixFactor), SnowLevel - (1000 * slope - 150 * MixFactor), RawPos.z));
} }
fragColor = color * texel + specular; fragColor = color * texel + specular;
if(cover >= 2.5){
fragColor.rgb = fragColor.rgb * 1.2;
} else {
fragColor.rg = fragColor.rg * (0.6 + 0.2 * cover);
fragColor.b = fragColor.b * (0.5 + 0.25 * cover);
}
fogFactor = exp(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord); fogFactor = exp(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord);
gl_FragColor = mix(gl_Fog.color, fragColor, fogFactor); gl_FragColor = mix(gl_Fog.color, fragColor, fogFactor);
} }