shaders/water.h

   1 #ifndef SHADER_water_H
   2 #define SHADER_water_H
   3 static void shader_water_link(void);
   4 static void shader_water_register(void);
   5 static struct vg_shader _shader_water = {
   6    .name = "water",
   7    .link = shader_water_link,
   8    .vs =
   9 {
  10 .orig_file = "../shaders/water.vs",
  11 .static_src =
  12 "layout (location=0) in vec3 a_co;\n"
  13 "layout (location=1) in vec3 a_norm;\n"
  14 "layout (location=2) in vec4 a_colour;\n"
  15 "layout (location=3) in vec2 a_uv;\n"
  16 "\n"
  17 "#line      2        0 \n"
  18 "\n"
  19 "uniform mat4 uPv;\n"
  20 "uniform mat4x3 uMdl;\n"
  21 "uniform vec4 uDepthBounds;\n"
  22 "\n"
  23 "out vec4 aUv;\n"
  24 "out vec3 aCo;\n"
  25 "\n"
  26 "void main()\n"
  27 "{\n"
  28 "   vec3 world_pos = uMdl * vec4( a_co, 1.0 );\n"
  29 "   gl_Position = uPv * vec4(world_pos,1.0);\n"
  30 "\n"
  31 "   vec2 depth_coords = (world_pos.xz-uDepthBounds.xy)*uDepthBounds.zw;\n"
  32 "   aUv = vec4(world_pos.xz*0.1,depth_coords);\n"
  33 "   aCo = world_pos;\n"
  34 "}\n"
  35 ""},
  36    .fs =
  37 {
  38 .orig_file = "../shaders/water.fs",
  39 .static_src =
  40 "out vec4 FragColor;\n"
  41 "\n"
  42 "uniform sampler2D uTexMain;\n"
  43 "uniform sampler2D uTexDudv;\n"
  44 "uniform sampler2D uTexDepth;\n"
  45 "uniform vec2 uInvRes;\n"
  46 "uniform float uTime;\n"
  47 "\n"
  48 "in vec4 aUv;\n"
  49 "in vec3 aCo;\n"
  50 "\n"
  51 "void main()\n"
  52 "{\n"
  53 "   vec2 ssuv = gl_FragCoord.xy*uInvRes;\n"
  54 "   vec4 dudva = texture( uTexDudv, aUv.xy + vec2(uTime*0.04f,uTime*0.03f) );\n"
  55 "   vec4 dudvb = texture( uTexDudv, aUv.xy - vec2(uTime*0.1,uTime*0.054) );\n"
  56 "\n"
  57 "   vec2 distortamt = (dudva.rg-0.5) * (dudvb.ba-0.5) * 2.0;\n"
  58 "\n"
  59 "   vec4 reflected = texture( uTexMain, ssuv+distortamt );\n"
  60 "   float depthvalue = texture( uTexDepth, aUv.zw ).r;\n"
  61 "   float opacity = smoothstep( 0.0, 0.1, depthvalue );\n"
  62 "\n"
  63 "   vec3 colour_shore = vec3( 0.96, 0.98, 0.9 );\n"
  64 "   vec3 colour_ocean = vec3( 0.61, 0.84, 0.9 );\n"
  65 "   vec3 surface_tint = mix( colour_shore, colour_ocean, depthvalue );\n"
  66 "\n"
  67 "   vec3 comp_surf = mix(pow(surface_tint,vec3(6.0))*0.6,reflected.rgb, 0.7);\n"
  68 "   \n"
  69 "   float band = fract( aCo.z*0.1+uTime*0.1-depthvalue*10.0 );\n"
  70 "   band = step( band + dudvb.g*0.8, 0.5 ) * max((1.0-depthvalue*4.0),0.0);\n"
  71 "\n"
  72 "   FragColor = vec4(comp_surf + band*0.2,opacity+band*0.2);\n"
  73 "}\n"
  74 ""},
  75 };
  76
  77 static GLuint _uniform_water_uPv;
  78 static GLuint _uniform_water_uMdl;
  79 static GLuint _uniform_water_uDepthBounds;
  80 static GLuint _uniform_water_uTexMain;
  81 static GLuint _uniform_water_uTexDudv;
  82 static GLuint _uniform_water_uTexDepth;
  83 static GLuint _uniform_water_uInvRes;
  84 static GLuint _uniform_water_uTime;
  85 static void shader_water_uPv(m4x4f m){
  86    glUniformMatrix4fv( _uniform_water_uPv, 1, GL_FALSE, (float *)m );
  87 }
  88 static void shader_water_uMdl(m4x3f m){
  89    glUniformMatrix4x3fv( _uniform_water_uMdl, 1, GL_FALSE, (float *)m );
  90 }
  91 static void shader_water_uDepthBounds(v4f v){
  92    glUniform4fv( _uniform_water_uDepthBounds, 1, v );
  93 }
  94 static void shader_water_uTexMain(int i){
  95    glUniform1i( _uniform_water_uTexMain, i );
  96 }
  97 static void shader_water_uTexDudv(int i){
  98    glUniform1i( _uniform_water_uTexDudv, i );
  99 }
 100 static void shader_water_uTexDepth(int i){
 101    glUniform1i( _uniform_water_uTexDepth, i );
 102 }
 103 static void shader_water_uInvRes(v2f v){
 104    glUniform2fv( _uniform_water_uInvRes, 1, v );
 105 }
 106 static void shader_water_uTime(float f){
 107    glUniform1f( _uniform_water_uTime, f );
 108 }
 109 static void shader_water_register(void){
 110    vg_shader_register( &_shader_water );
 111 }
 112 static void shader_water_use(void){ glUseProgram(_shader_water.id); }
 113 static void shader_water_link(void){
 114    _uniform_water_uPv = glGetUniformLocation( _shader_water.id, "uPv" );
 115    _uniform_water_uMdl = glGetUniformLocation( _shader_water.id, "uMdl" );
 116    _uniform_water_uDepthBounds = glGetUniformLocation( _shader_water.id, "uDepthBounds" );
 117    _uniform_water_uTexMain = glGetUniformLocation( _shader_water.id, "uTexMain" );
 118    _uniform_water_uTexDudv = glGetUniformLocation( _shader_water.id, "uTexDudv" );
 119    _uniform_water_uTexDepth = glGetUniformLocation( _shader_water.id, "uTexDepth" );
 120    _uniform_water_uInvRes = glGetUniformLocation( _shader_water.id, "uInvRes" );
 121    _uniform_water_uTime = glGetUniformLocation( _shader_water.id, "uTime" );
 122 }
 123 #endif /* SHADER_water_H */