tavli: sdr/shadow.p.glsl annotate

tavli

shadows, not completed

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 29 Jun 2015 01:29:36 +0300
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rev	line source
nuclear@18	1 /* vi: set ft=glsl */
nuclear@18	2 uniform sampler2D tex;
nuclear@18	3 uniform sampler2DShadow shadowmap;
nuclear@18	4
nuclear@18	5 varying vec3 vdir, ldir, normal;
nuclear@18	6 varying vec4 shadow_tc;
nuclear@18	7
nuclear@18	8 #define KD gl_FrontMaterial.diffuse.rgb
nuclear@18	9 #define KS gl_FrontMaterial.specular.rgb
nuclear@18	10 #define SPOW gl_FrontMaterial.shininess
nuclear@18	11
nuclear@18	12 void main()
nuclear@18	13 {
nuclear@18	14 float shadow = shadow2DProj(shadowmap, shadow_tc).x;
nuclear@18	15 vec4 texel = texture2D(tex, gl_TexCoord[0].st);
nuclear@18	16
nuclear@18	17 vec3 n = normalize(normal);
nuclear@18	18 vec3 v = normalize(vdir);
nuclear@18	19 vec3 l = normalize(ldir);
nuclear@18	20 vec3 h = normalize(l + v);
nuclear@18	21
nuclear@18	22 float ndotl = max(dot(n, l), 0.0);
nuclear@18	23 float ndoth = max(dot(n, h), 0.0);
nuclear@18	24
nuclear@18	25 vec3 albedo = KD * texel.rgb;
nuclear@18	26 vec3 diffuse = albedo * gl_LightSource[0].diffuse.rgb * ndotl;
nuclear@18	27 vec3 specular = KS * gl_LightSource[0].specular.rgb * pow(ndoth, SPOW);
nuclear@18	28
nuclear@18	29 vec3 ambient = gl_LightModel.ambient.rgb * albedo;
nuclear@18	30 gl_FragColor.rgb = ambient + (diffuse + specular) * shadow;
nuclear@18	31 gl_FragColor.a = gl_FrontMaterial.diffuse.a * texel.a;
nuclear@18	32 }