113 lines
3 KiB
Text
113 lines
3 KiB
Text
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!!cvarf r_glsl_turbscale=1
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!!cvarf gl_maxdist=8192
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!!cvarf gl_mindist=4
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!!samps normalmap diffuse 4
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!!argb reflect=0 //s_t1 is a reflection instead of diffusemap
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!!argf strength=0.1 //0.1 = fairly gentle, 0.2 = big waves
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!!argf fresnel=5.0 //water should be around 5
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!!argf txscale=0.2 //wave strength
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!!argb ripplemap=0 //s_t2 contains a ripplemap
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!!arg3f tint=0.7 0.8 0.7 //some colour value
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!!argb depth=0 //s_t3 is a depth image
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!!arg3f fogtint=0.2 0.3 0.2 //tints as it gets deeper
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#include "sys/defs.h"
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layout(location=0) varying vec2 tc;
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layout(location=1) varying vec4 tf;
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layout(location=2) varying vec3 norm;
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layout(location=3) varying vec3 eye;
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#ifdef VERTEX_SHADER
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void main (void)
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{
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tc = v_texcoord.st;
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tf = ftetransform();
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norm = v_normal;
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eye = e_eyepos - v_position.xyz;
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gl_Position = tf;
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}
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#endif
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#ifdef FRAGMENT_SHADER
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#define s_refract s_t0
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#define s_reflect s_t1
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#define s_ripplemap s_t2
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#define s_refractdepth s_t3
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void main (void)
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{
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vec2 stc, ntc;
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vec3 n, refr, refl;
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float fres;
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float depth;
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stc = (1.0 + (tf.xy / tf.w)) * 0.5;
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//hack the texture coords slightly so that there are no obvious gaps
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stc.t -= 1.5*norm.z/1080.0;
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//apply q1-style warp, just for kicks
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ntc.s = tc.s + sin(tc.t+e_time)*0.125;
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ntc.t = tc.t + sin(tc.s+e_time)*0.125;
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//generate the two wave patterns from the normalmap
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n = (texture2D(s_normalmap, arg_txscale*tc + vec2(e_time*0.1, 0.0)).xyz);
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n += (texture2D(s_normalmap, arg_txscale*tc - vec2(0, e_time*0.097)).xyz);
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n -= 1.0 - 4.0/256.0;
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if (arg_ripplemap)
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n += texture2D(s_ripplemap, stc).rgb*3.0;
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//the fresnel term decides how transparent the water should be
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fres = pow(1.0-abs(dot(normalize(n), normalize(eye))), arg_fresnel);
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if (arg_depth)
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{
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float far = cvar_gl_maxdist;
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float near = cvar_gl_mindist;
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//get depth value at the surface
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float sdepth = gl_FragCoord.z;
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sdepth = (2.0*near) / (far + near - sdepth * (far - near));
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sdepth = mix(near, far, sdepth);
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//get depth value at the ground beyond the surface.
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float gdepth = texture2D(s_refractdepth, stc).x;
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gdepth = (2.0*near) / (far + near - gdepth * (far - near));
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if (gdepth >= 0.5)
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{
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gdepth = sdepth;
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depth = 0.0;
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}
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else
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{
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gdepth = mix(near, far, gdepth);
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depth = gdepth - sdepth;
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}
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//reduce the normals in shallow water (near walls, reduces the pain of linear sampling)
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if (depth < 100.0)
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n *= depth/100.0;
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}
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else
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depth = 1.0;
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//refraction image (and water fog, if possible)
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refr = texture2D(s_refract, stc + n.st*arg_strength*cvar_r_glsl_turbscale).rgb * arg_tint;
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if (arg_depth)
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refr = mix(refr, arg_fogtint, min(depth/4096.0, 1.0));
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//reflection/diffuse
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if (arg_reflect)
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refl = texture2D(s_reflect, stc - n.st*arg_strength*cvar_r_glsl_turbscale).rgb;
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else
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refl = texture2D(s_diffuse, ntc).xyz;
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//FIXME: add specular tints
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//interplate by fresnel
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refr = mix(refr, refl, fres);
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//done
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gl_FragColor = vec4(refr, 1.0);
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}
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#endif
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