shaders/blitblur.h

   1 #ifndef SHADER_blitblur_H
   2 #define SHADER_blitblur_H
   3 static void shader_blitblur_link(void);
   4 static void shader_blitblur_register(void);
   5 static struct vg_shader _shader_blitblur = {
   6    .name = "blitblur",
   7    .link = shader_blitblur_link,
   8    .vs =
   9 {
  10 .static_src =
  11 "layout (location=0) in vec2 a_co;\n"
  12 "out vec2 aUv;\n"
  13 "\n"
  14 "void main()\n"
  15 "{\n"
  16 "   gl_Position = vec4(a_co*2.0-1.0,0.0,1.0);\n"
  17 "   aUv = a_co;\n"
  18 "}\n"
  19 ""},
  20    .fs =
  21 {
  22 .static_src =
  23 "out vec4 FragColor;\n"
  24 "uniform sampler2D uTexMain;\n"
  25 "\n"
  26 "in vec2 aUv;\n"
  27 "\n"
  28 "vec2 rand_hash22( vec2 p )\n"
  29 "{\n"
  30 "   vec3 p3 = fract(vec3(p.xyx) * 213.8976123);\n"
  31 "   p3 += dot(p3, p3.yzx+19.19);\n"
  32 "   return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));\n"
  33 "}\n"
  34 "\n"
  35 "void main()\n"
  36 "{\n"
  37 "   vec2 voffset = rand_hash22( aUv );\n"
  38 "   \n"
  39 "   float bamt = abs(aUv.x-0.5)*2.0;\n"
  40 "   bamt = pow(bamt,4.0)*0.05;\n"
  41 "\n"
  42 "   FragColor = texture( uTexMain, aUv + voffset*bamt );\n"
  43 "}\n"
  44 ""},
  45 };
  46
  47 static GLuint _uniform_blitblur_uTexMain;
  48 static void shader_blitblur_uTexMain(int i){
  49    glUniform1i(_uniform_blitblur_uTexMain,i);
  50 }
  51 static void shader_blitblur_register(void){
  52    vg_shader_register( &_shader_blitblur );
  53 }
  54 static void shader_blitblur_use(void){ glUseProgram(_shader_blitblur.id); }
  55 static void shader_blitblur_link(void){
  56    _uniform_blitblur_uTexMain = glGetUniformLocation( _shader_blitblur.id, "uTexMain" );
  57 }
  58 #endif /* SHADER_blitblur_H */