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 "\n"
  22 "out vec2 aUv;\n"
  23 "\n"
  24 "void main()\n"
  25 "{\n"
  26 "   vec3 world_pos = uMdl * vec4( a_co, 1.0 );\n"
  27 "   gl_Position = uPv * vec4(world_pos,1.0);\n"
  28 "   aUv = vec2(world_pos[0],world_pos[2])*0.15;\n"
  29 "}\n"
  30 ""},
  31    .fs =
  32 {
  33 .orig_file = "../shaders/water.fs",
  34 .static_src =
  35 "out vec4 FragColor;\n"
  36 "\n"
  37 "uniform sampler2D uTexMain;\n"
  38 "uniform sampler2D uTexDudv;\n"
  39 "uniform vec2 uInvRes;\n"
  40 "uniform float uTime;\n"
  41 "\n"
  42 "in vec2 aUv;\n"
  43 "\n"
  44 "void main()\n"
  45 "{\n"
  46 "   vec2 ssuv = gl_FragCoord.xy*uInvRes;\n"
  47 "   vec4 dudva = texture( uTexDudv, aUv + vec2(uTime*0.04f,uTime*0.03f) );\n"
  48 "   vec4 dudvb = texture( uTexDudv, aUv - vec2(uTime*0.1,uTime*0.054) );\n"
  49 "\n"
  50 "   vec2 distortamt = (dudva.rg-0.5) * (dudvb.ba-0.5) * 2.0;\n"
  51 "\n"
  52 "   vec4 reflected = texture( uTexMain, ssuv+distortamt );\n"
  53 "   FragColor = vec4(reflected.rgb*1.0,reflected.a);\n"
  54 "}\n"
  55 ""},
  56 };
  57
  58 static GLuint _uniform_water_uPv;
  59 static GLuint _uniform_water_uMdl;
  60 static GLuint _uniform_water_uTexMain;
  61 static GLuint _uniform_water_uTexDudv;
  62 static GLuint _uniform_water_uInvRes;
  63 static GLuint _uniform_water_uTime;
  64 static void shader_water_uPv(m4x4f m){
  65    glUniformMatrix4fv( _uniform_water_uPv, 1, GL_FALSE, (float *)m );
  66 }
  67 static void shader_water_uMdl(m4x3f m){
  68    glUniformMatrix4x3fv( _uniform_water_uMdl, 1, GL_FALSE, (float *)m );
  69 }
  70 static void shader_water_uTexMain(int i){
  71    glUniform1i( _uniform_water_uTexMain, i );
  72 }
  73 static void shader_water_uTexDudv(int i){
  74    glUniform1i( _uniform_water_uTexDudv, i );
  75 }
  76 static void shader_water_uInvRes(v2f v){
  77    glUniform2fv( _uniform_water_uInvRes, 1, v );
  78 }
  79 static void shader_water_uTime(float f){
  80    glUniform1f( _uniform_water_uTime, f );
  81 }
  82 static void shader_water_register(void){
  83    vg_shader_register( &_shader_water );
  84 }
  85 static void shader_water_use(void){ glUseProgram(_shader_water.id); }
  86 static void shader_water_link(void){
  87    _uniform_water_uPv = glGetUniformLocation( _shader_water.id, "uPv" );
  88    _uniform_water_uMdl = glGetUniformLocation( _shader_water.id, "uMdl" );
  89    _uniform_water_uTexMain = glGetUniformLocation( _shader_water.id, "uTexMain" );
  90    _uniform_water_uTexDudv = glGetUniformLocation( _shader_water.id, "uTexDudv" );
  91    _uniform_water_uInvRes = glGetUniformLocation( _shader_water.id, "uInvRes" );
  92    _uniform_water_uTime = glGetUniformLocation( _shader_water.id, "uTime" );
  93 }
  94 #endif /* SHADER_water_H */