54 lines
1.8 KiB
GLSL
54 lines
1.8 KiB
GLSL
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// -*- mode: C; -*-
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// Licence: GPL v2
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// Authors: Original code by Thorsten Jordan, Luis Barrancos and others (dangerdeep.sf.net)
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// Modified by Emilian Huminiuc (emilianh@gmail.com) (i4dnf on the flightgear forums).
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// fixme: maybe lookup texmap is faster than pow(). Quick tests showed that this is not the case...
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uniform sampler2D tex_color; // (diffuse) color map, RGB
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uniform sampler2D tex_normal; // normal map, RGB + A Specular
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varying vec4 ecPosition;
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varying vec3 lightdir, halfangle;
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void main()
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{
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// get and normalize vector to light source
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vec3 L = normalize(lightdir);
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// get and normalize normal vector from texmap
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vec4 v = texture2D(tex_normal, gl_TexCoord[0].st);
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vec3 N = normalize(vec3(v.xyz * 2.0 - 1.0));
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N.y = -N.y;
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if (!gl_FrontFacing)
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N = -N;
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// compute specular color
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// get and normalize half angle vector
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vec3 H = normalize(halfangle);
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// compute resulting specular color
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vec3 specular_color = vec3(gl_FrontMaterial.specular) *
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pow(max(dot(H, N), 0.0), gl_FrontMaterial.shininess);
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// compute diffuse color
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vec3 diffuse_color = vec3(texture2D(tex_color, gl_TexCoord[0].st));
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// handle ambient
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diffuse_color = diffuse_color * mix(max(dot(L, N), 0.0), 0.6, gl_LightSource[0].ambient.r);
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specular_color = specular_color * v.a;
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// final color of fragment
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vec3 final_color = clamp((diffuse_color + specular_color) * vec3(gl_LightSource[0].diffuse /*light_color*/), 0.0, 1.0);
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float fog_factor;
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float fogCoord = ecPosition.z;
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const float LOG2 = 1.442695;
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fog_factor = exp2(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord * LOG2);
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fog_factor = clamp(fog_factor, 0.0, 1.0);
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// output color is a mix between fog and final color
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gl_FragColor = vec4(mix(vec3(gl_Fog.color), final_color, fog_factor), 1.0);
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}
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