81 lines
2.1 KiB
GLSL
81 lines
2.1 KiB
GLSL
//======= Copyright (c) 2015-2022 Vera Visions LLC. All rights reserved. =======
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//
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// Purpose:
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//
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// Water shader that distorts the reflection based on a supplied normalmap
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// and blends it on top of a skybox (cube) image.
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//==============================================================================
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!!ver 110
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!!permu FOG
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!!samps reflect=0 norm=1 skycube:samplerCube=2
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#include "sys/defs.h"
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varying vec2 tex_c;
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varying vec2 lm_c;
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varying mat3 invsurface;
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varying vec4 tf_c;
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varying vec3 eyeminusvertex;
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varying vec3 eyevector;
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varying vec2 shift1;
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varying vec2 shift2;
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#ifdef VERTEX_SHADER
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void main ()
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{
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invsurface[0] = v_svector;
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invsurface[1] = v_tvector;
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invsurface[2] = v_normal;
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eyeminusvertex = e_eyepos - v_position.xyz;
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eyevector.x = dot(eyeminusvertex, v_svector.xyz);
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eyevector.y = dot(eyeminusvertex, v_tvector.xyz);
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eyevector.z = dot(eyeminusvertex, v_normal.xyz);
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tf_c = ftetransform();
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tf_c.z += 0.1;
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shift1 = v_texcoord + vec2( e_time * 0.025, 0.0 );
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shift2 = v_texcoord - vec2( 0, e_time * -0.025 );
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tex_c = v_texcoord;
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gl_Position = tf_c;
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}
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#endif
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#ifdef FRAGMENT_SHADER
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#include "sys/fog.h"
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void main ( void )
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{
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float fres;
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vec2 refl_c;
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vec3 refl_f;
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vec3 refr_f;
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vec3 norm_f;
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vec3 cube_c;
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vec4 out_f = vec4( 1.0, 1.0, 1.0, 1.0 );
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// Use the normalmap to shift the refraction
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norm_f = ( texture2D( s_norm, shift1 ).xyz);
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norm_f += ( texture2D( s_norm, shift2 ).xyz);
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norm_f -= 1.0 - ( 16.0 / 1024.0 );
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norm_f = normalize( norm_f );
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// Reflection/View coordinates
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refl_c = ( 1.0 + ( tf_c.xy / tf_c.w ) ) * 0.5;
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refl_c.t -= 1.5 * invsurface[2].z / 1080.0;
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// Load reflection and refraction based on our new coords
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refl_f = texture2D(s_reflect, refl_c + ( norm_f.st * 0.1 )).rgb;
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cube_c = reflect(normalize(eyevector), norm_f.rgb);
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cube_c = cube_c.x * invsurface[0] + cube_c.y * invsurface[1] + cube_c.z * invsurface[2];
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cube_c = (m_model * vec4(cube_c.xyz, 0.0)).xyz;
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refr_f = textureCube(s_skycube, cube_c).rgb;
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fres = pow( 1.0 - abs( dot( norm_f, normalize( eyeminusvertex ) ) ), 1.0 );
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out_f.rgb = mix( refr_f, refl_f, fres );
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gl_FragColor = fog4(out_f);
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}
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#endif
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