townforge/GameData/Shaders/GLSL/TownforgeTerrain.glsl

#include "Uniforms.glsl"
#include "Samplers.glsl"
#include "Transform.glsl"
#include "ScreenPos.glsl"
#include "Lighting.glsl"
#include "Fog.glsl"
#include "PostProcess.glsl"

varying vec2 vTexCoord;

#ifndef GL_ES
varying vec2 vDetailTexCoord;
#else
varying mediump vec2 vDetailTexCoord;
#endif

varying vec3 vNormal;
varying vec4 vWorldPos;
#ifdef PERPIXEL
    #ifdef SHADOW
        #ifndef GL_ES
            varying vec4 vShadowPos[NUMCASCADES];
        #else
            varying highp vec4 vShadowPos[NUMCASCADES];
        #endif
    #endif
    #ifdef SPOTLIGHT
        varying vec4 vSpotPos;
    #endif
    #ifdef POINTLIGHT
        varying vec3 vCubeMaskVec;
    #endif
#else
    varying vec3 vVertexLight;
    varying vec4 vScreenPos;
    #ifdef ENVCUBEMAP
        varying vec3 vReflectionVec;
    #endif
    #if defined(LIGHTMAP) || defined(AO)
        varying vec2 vTexCoord2;
    #endif
#endif

uniform sampler2D sWeightMap0;
uniform sampler2D sDetailMap1;
uniform sampler2D sDetailMap2;
uniform sampler2D sDetailMap3;
uniform sampler2D sDetailMap4;
uniform sampler2D sHighlightMap5;
#ifndef NOSNOW
#ifdef SNOWTEXTURE
uniform sampler2D sSnowMap6;
#endif
#endif
uniform sampler2D sDetailMap7;

#ifndef GL_ES
uniform vec2 cDetailTiling;
varying vec4 vEyeVec;
#else
uniform mediump vec2 cDetailTiling;
varying highp vec4 vEyeVec;
#endif

#ifndef NOSNOW
#
uniform float cSnowinessMinTemperature;
uniform float cSnowinessMaxTemperature;
uniform float cMaxSnowDepth;

const float min_snow_threshold = 0.25;
const float max_snow_threshold = 0.95;
const float snow_saturation = 0.15;
uniform float cSnowDarkening;
varying float snow_depth;
varying float snowiness;
#endif

uniform vec4 cHighlightColor;

uniform float cTemperature;
varying float grassiness;
uniform float cTemperatureAltitudeDecrease;
uniform float cTemperatureAltitudeFloor;

const float ambientMultiplier = 1.5;

float GetTemperatureAtHeight(float height)
{
  height = max(height - cTemperatureAltitudeFloor, 0.0);
  float temperature = cTemperature - height * cTemperatureAltitudeDecrease;
  temperature -= height * cTemperatureAltitudeDecrease;
  return temperature;
}

void VS()
{
    mat4 modelMatrix = iModelMatrix;
    vec3 worldPos = GetWorldPos(modelMatrix);
    gl_Position = GetClipPos(worldPos);
    vNormal = GetWorldNormal(modelMatrix);
    vWorldPos = vec4(worldPos, GetDepth(gl_Position));
    vTexCoord = GetTexCoord(iTexCoord);
    vDetailTexCoord = cDetailTiling * vTexCoord;
    vEyeVec = vec4(cCameraPos - worldPos, GetDepth(gl_Position));


    #ifdef PERPIXEL
        // Per-pixel forward lighting
        vec4 projWorldPos = vec4(worldPos, 1.0);

        #ifdef SHADOW
            // Shadow projection: transform from world space to shadow space
            for (int i = 0; i < NUMCASCADES; i++)
                vShadowPos[i] = GetShadowPos(i, vNormal, projWorldPos);
        #endif

        #ifdef SPOTLIGHT
            // Spotlight projection: transform from world space to projector texture coordinates
            vSpotPos = projWorldPos * cLightMatrices[0];
        #endif
    
        #ifdef POINTLIGHT
            vCubeMaskVec = (worldPos - cLightPos.xyz) * mat3(cLightMatrices[0][0].xyz, cLightMatrices[0][1].xyz, cLightMatrices[0][2].xyz);
        #endif
    #else
        // Ambient & per-vertex lighting
        #if defined(LIGHTMAP) || defined(AO)
            // If using lightmap, disregard zone ambient light
            // If using AO, calculate ambient in the PS
            vVertexLight = vec3(0.0, 0.0, 0.0);
            vTexCoord2 = iTexCoord1;
        #else
            vVertexLight = GetAmbient(GetZonePos(worldPos));
        #endif
        
        #ifdef NUMVERTEXLIGHTS
            for (int i = 0; i < NUMVERTEXLIGHTS; ++i)
                vVertexLight += GetVertexLight(i, worldPos, vNormal) * cVertexLights[i * 3].rgb;
        #endif
        
        vScreenPos = GetScreenPos(gl_Position);

        #ifdef ENVCUBEMAP
            vReflectionVec = worldPos - cCameraPos;
        #endif
    #endif

    float posTemperature = GetTemperatureAtHeight(vWorldPos.y);
    grassiness = max(cTemperature, -2.0);
    grassiness = min(grassiness, 10.0);
    grassiness = (grassiness + 2.0) / (10.0);

    #ifndef NOSNOW
        snowiness = max(posTemperature, cSnowinessMinTemperature);
        snowiness = min(snowiness, cSnowinessMaxTemperature);
        snowiness = (cSnowinessMaxTemperature - snowiness) / (cSnowinessMaxTemperature - cSnowinessMinTemperature);
        float snow_threshold = min_snow_threshold * snowiness + max_snow_threshold * (1.0 - snowiness);
        float upness = min((max(2.0 * snowiness * dot(vNormal, vec3(0.0, 1.0, 0.0)), snow_threshold) - snow_threshold) / (1.0 + snow_saturation - snow_threshold), 1.0);
        snow_depth = snowiness * max((upness - 0.5), 0.0) * 2;
    #endif
    // gl_Position.y += snow_depth * cMaxSnowDepth;
}

void PS()
{
    // // Weights
    vec3 weights = texture2D(sWeightMap0, vTexCoord).rgb;
    float sumWeights = weights.r + weights.g + weights.b;
    weights /= sumWeights;
    float weightsCr = max(weights.b, weights.r);

    // // Textures
    vec4 tGrass = texture2D(sDetailMap3, vDetailTexCoord) * .1 + texture2D(sDetailMap3, vDetailTexCoord * 20) * .8;
    vec4 tDeadGrass = texture2D(sDetailMap1, vDetailTexCoord) * .1 + texture2D(sDetailMap1, vDetailTexCoord * 20);
    vec4 tGround = texture2D(sDetailMap2, vDetailTexCoord) * .1 + texture2D(sDetailMap2, vDetailTexCoord * 20) * .8;
    vec4 dtGrass = mix(tDeadGrass, tGrass , grassiness);
    vec4 tMountain = texture2D(sDetailMap7, vDetailTexCoord)  * .4 + texture2D(sDetailMap7, vDetailTexCoord * 4) * .6;

    // // Mix Diffuse
    vec4 diffColor = (
        ((weights.r * tGround * mix(.8, 1.0, grassiness) +
        weights.b * tGrass) * weightsCr +
        (1.0 - weightsCr) * dtGrass) *
        (1.0 - weights.g) + tMountain * weights.g * .8
    );
    
    // Get material specular from diffuse
    vec3 specColor = cMatSpecColor.rgb * (diffColor.g - .4);
    
    // Add Snow
    #ifndef NOSNOW
        vec4 tSnowOverlay = texture2D(sDetailMap4, vDetailTexCoord) * (1.0 - texture2D(sDetailMap4, vDetailTexCoord * 5));
        vec4 tSnow = (texture2D(sSnowMap6, vTexCoord) * .8 + texture2D(sSnowMap6, vTexCoord * 4) * .2)  * cSnowDarkening;
        if (snowiness != .0 && snow_depth != 1.0)
            diffColor = diffColor * (1.0 - tSnowOverlay * (1.0 - weights.g) * (1.0 - weights.r * .5) * snowiness) +
            tSnowOverlay * .4 * (1.0 - weights.g) * (1.0 - weights.r * .7);
            
        if (snow_depth != .0)
            diffColor = diffColor * (1.0 - snow_depth) + tSnow * snow_depth * .7;
    #endif

    float fresnel = pow(1.0 - clamp(dot(normalize(vEyeVec.xyz), vNormal), 0.0, 1.0), 4.0);
    diffColor = diffColor * mix(1.1, .8, fresnel);
    
    // Get normal
    #ifdef APPROXIMATENORMAL
    vec3 normal = vNormal;
    #else
    vec3 normal = normalize(vNormal);
    #endif

    // Get fog factor
    #ifdef HEIGHTFOG
        float fogFactor = GetHeightFogFactor(vWorldPos.w, vWorldPos.y);
    #else
        float fogFactor = GetFogFactor(vWorldPos.w);
    #endif

    #if defined(PERPIXEL)
        // Per-pixel forward lighting
        vec3 lightColor;
        vec3 lightDir;
        vec3 finalColor;
        
        float diff = GetDiffuse(normal, vWorldPos.xyz, lightDir);

        #ifdef SHADOW
            diff *= GetShadow(vShadowPos, vWorldPos.w);
        #endif
    
        #if defined(SPOTLIGHT)
            lightColor = vSpotPos.w > 0.0 ? texture2DProj(sLightSpotMap, vSpotPos).rgb * cLightColor.rgb : vec3(0.0, 0.0, 0.0);
        #elif defined(CUBEMASK)
            lightColor = textureCube(sLightCubeMap, vCubeMaskVec).rgb * cLightColor.rgb;
        #else
            lightColor = cLightColor.rgb;
        #endif
    
        #ifdef SPECULAR
            float spec = GetSpecular(normal, cCameraPosPS - vWorldPos.xyz, lightDir, cMatSpecColor.a);
            finalColor = diff * lightColor * (diffColor.rgb + spec * specColor * cLightColor.a);
        #else
            finalColor = diff * lightColor * diffColor.rgb;
        #endif

        #ifdef AMBIENT
            finalColor += cAmbientColor.rgb * diffColor.rgb * ambientMultiplier;
            finalColor += cMatEmissiveColor;
            gl_FragColor = vec4(GetFog(finalColor, fogFactor), diffColor.a);
        #else
            gl_FragColor = vec4(GetLitFog(finalColor, fogFactor), diffColor.a);
        #endif
    #elif defined(PREPASS)
        // Fill light pre-pass G-Buffer
        float specPower = cMatSpecColor.a / 255.0;

        gl_FragData[0] = vec4(normal * 0.5 + 0.5, specPower);
        gl_FragData[1] = vec4(EncodeDepth(vWorldPos.w), 0.0);
    #elif defined(DEFERRED)
        // Fill deferred G-buffer
        float specIntensity = specColor.g;
        float specPower = cMatSpecColor.a / 255.0;

        gl_FragData[0] = vec4(GetFog(vVertexLight * diffColor.rgb, fogFactor), 1.0);
        gl_FragData[1] = fogFactor * vec4(diffColor.rgb, specIntensity);
        gl_FragData[2] = vec4(normal * 0.5 + 0.5, specPower);
        gl_FragData[3] = vec4(EncodeDepth(vWorldPos.w), 0.0);
    #else
        // Ambient & per-vertex lighting
        vec3 finalColor = vVertexLight * diffColor.rgb * ambientMultiplier;

        #ifdef MATERIAL
            // Add light pre-pass accumulation result
            // Lights are accumulated at half intensity. Bring back to full intensity now
            vec4 lightInput = 2.0 * texture2DProj(sLightBuffer, vScreenPos);
            vec3 lightSpecColor = lightInput.a * lightInput.rgb / max(GetIntensity(lightInput.rgb), 0.001);

            finalColor += lightInput.rgb * diffColor.rgb + lightSpecColor * specColor;
        #endif

        gl_FragColor = vec4(GetFog(finalColor, fogFactor), diffColor.a);
    #endif

    float selected = texture2D(sHighlightMap5, vTexCoord).r;
    gl_FragColor = gl_FragColor * (1.0 - selected / 2.0) + cHighlightColor * selected / 2.0;
}