53 lines
1.3 KiB
GLSL
53 lines
1.3 KiB
GLSL
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#version 330 core
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layout(location = 0) out vec4 fragColor;
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in VS_OUT {
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vec2 texcoord;
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vec2 orthophoto_texcoord;
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vec3 vertex_normal;
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vec3 world_vector;
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} fs_in;
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uniform sampler2D color_tex;
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uniform sampler2D orthophoto_tex;
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uniform bool orthophotoAvailable;
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uniform vec3 fg_SunDirectionWorld;
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uniform vec4 fg_Viewport;
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// math.glsl
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float M_1_PI();
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// color.glsl
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vec3 eotf_inverse_sRGB(vec3 srgb);
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// sun.glsl
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vec3 get_sun_radiance_sea_level();
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// aerial_perspective_envmap.glsl
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vec4 get_aerial_perspective(vec3 pos);
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vec3 mix_aerial_perspective(vec3 color, vec4 ap);
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void main()
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{
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vec3 texel = texture(color_tex, fs_in.texcoord).rgb;
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if (orthophotoAvailable) {
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vec4 sat_texel = texture(orthophoto_tex, fs_in.orthophoto_texcoord);
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if (sat_texel.a > 0.0) {
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texel.rgb = sat_texel.rgb;
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}
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}
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vec3 color = eotf_inverse_sRGB(texel);
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vec3 sun_radiance = get_sun_radiance_sea_level();
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vec3 N = normalize(fs_in.vertex_normal);
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float NdotL = max(dot(N, fg_SunDirectionWorld), 1e-4);
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// Assume a perfectly diffuse Lambertian surface
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color = M_1_PI() * color * sun_radiance * NdotL;
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vec4 ap = get_aerial_perspective(fs_in.world_vector);
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color = mix_aerial_perspective(color, ap);
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fragColor = vec4(color, 1.0);
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}
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