107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
// -*-C++-*-
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// Ambient term comes in gl_Color.rgb.
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#version 120
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varying vec4 diffuse_term;
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varying vec3 normal;
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varying vec3 ecViewDir;
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varying vec3 VTangent;
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uniform float visibility;
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uniform bool use_clouds;
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uniform bool use_cloud_shadows;
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uniform bool use_overlay;
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uniform sampler2D texture;
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uniform sampler2D shadowtex;
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uniform sampler2D grain_texture;
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float luminance(vec3 color)
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{
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return dot(vec3(0.212671, 0.715160, 0.072169), color);
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}
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void main()
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{
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vec3 n;
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float NdotL, NdotHV;
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vec4 color = gl_Color;
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vec3 lightDir = gl_LightSource[0].position.xyz;
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vec3 halfVector = normalize(normalize(lightDir) + normalize(ecViewDir));
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vec4 texel;
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vec4 shadowTexel;
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vec4 grainTexel;
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vec4 fragColor;
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vec4 specular = vec4(0.0);
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// If gl_Color.a == 0, this is a back-facing polygon and the
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// normal should be reversed.
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n = (2.0 * gl_Color.a - 1.0) * normal;
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n = normalize(n);
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vec3 VBinormal;
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VBinormal = cross(normal, VTangent);
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float xOffset = -0.005 * dot(normalize(lightDir), normalize(VTangent));
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float yOffset = -0.005 * dot(normalize(lightDir), normalize(VBinormal));
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if ((use_cloud_shadows)&&(use_clouds))
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{shadowTexel = texture2D(shadowtex, vec2(gl_TexCoord[0].s-xOffset, gl_TexCoord[0].t-yOffset));}
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else
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{shadowTexel = vec4 (0.0,0.0,0.0,0.0);}
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texel = texture2D(texture, gl_TexCoord[0].st);
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grainTexel = texture2D(grain_texture, gl_TexCoord[0].st * 40.0);
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vec3 light_specular = vec3 (1.0, 1.0, 1.0);
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NdotL = dot(n, lightDir);
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// due to atmosphere scattering, we should make this harder
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NdotL = smoothstep(-0.2,0.2,NdotL);
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float intensity = length(diffuse_term);
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vec4 dawn = intensity * normalize (vec4 (1.0,0.4,0.4,1.0));
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vec4 diff_term = mix(dawn, diffuse_term, smoothstep(0.0, 0.2, NdotL));
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intensity = length(light_specular);
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light_specular = mix(dawn.rgb, light_specular, smoothstep(0.0, 0.2, NdotL));
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float oceanness = smoothstep(0.0, 0.1,length(texel.rgb - vec3 (0.007,0.019, 0.078)));
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float specular_enhancement = 4.0 * (1.0 - oceanness);
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if (use_overlay) {texel.rgb = mix(texel.rgb, grainTexel.rgb, 0.4* grainTexel.a * oceanness);}
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if (NdotL > 0.0) {
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color += diffuse_term * NdotL * (1.0-shadowTexel.a);
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NdotHV = max(dot(n, halfVector), 0.0);
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if (gl_FrontMaterial.shininess > 0.0)
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specular.rgb = (gl_FrontMaterial.specular.rgb * specular_enhancement
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* light_specular * (1.0-shadowTexel.a)
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* pow(NdotHV, gl_FrontMaterial.shininess));
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}
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color.a = diffuse_term.a;
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// This shouldn't be necessary, but our lighting becomes very
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// saturated. Clamping the color before modulating by the texture
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// is closer to what the OpenGL fixed function pipeline does.
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color = clamp(color, 0.0, 1.0);
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fragColor = color * texel + specular;
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//fragColor = fragColor * (1.0 - 0.5 * shadowTexel.a);
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//fragColor = mix(fragColor, shadowTexel, shadowTexel.a);
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float angle = dot(normalize(ecViewDir), normalize(normal));
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float distance_through_atmosphere = 10.0 / ((angle)+0.001);
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vec4 fogColor = vec4 (0.83,0.9,1.0,1.0) * clamp(length(diffuse_term.rgb/1.73 * clamp(NdotL,0.01, 0.99)),0.0,1.0);
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//float visibility = 80.0;
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float fogFactor = exp(-distance_through_atmosphere/(visibility/1000.0));
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fragColor = mix(fogColor, fragColor, fogFactor);
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gl_FragColor = fragColor;
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}
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