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 "uniform sampler2D uTexMotion;\n"
  26 "uniform float uBlurStrength;\n"
  27 "uniform float uBlurExponent;\n"
  28 "\n"
  29 "in vec2 aUv;\n"
  30 "\n"
  31 "vec2 rand_hash22( vec2 p )\n"
  32 "{\n"
  33 "   vec3 p3 = fract(vec3(p.xyx) * 213.8976123);\n"
  34 "   p3 += dot(p3, p3.yzx+19.19);\n"
  35 "   return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));\n"
  36 "}\n"
  37 "\n"
  38 "void main()\n"
  39 "{\n"
  40 "   vec2 vcenter = (aUv-vec2(0.5))*vec2(2.0);\n"
  41 "   vec2 vrand = rand_hash22( aUv ) * 2.0 - vec2(1.0);\n"
  42 "   vec2 vrand1 = rand_hash22( vrand ) * 2.0 - vec2(1.0);\n"
  43 "   \n"
  44 "   vec2 vdir = texture( uTexMotion, aUv ).xy * uBlurStrength;\n"
  45 "\n"
  46 "   vec4 vcolour0 = texture( uTexMain, aUv + vdir*vrand.x );\n"
  47 "   vec4 vcolour1 = texture( uTexMain, aUv + vdir*vrand.y );\n"
  48 "   vec4 vcolour2 = texture( uTexMain, aUv + vdir*vrand1.x );\n"
  49 "   vec4 vcolour3 = texture( uTexMain, aUv + vdir*vrand1.y );\n"
  50 "\n"
  51 "   FragColor = ( vcolour0 + vcolour1 + vcolour2 + vcolour3 ) * 0.25;\n"
  52 "}\n"
  53 ""},
  54 };
  55
  56 static GLuint _uniform_blitblur_uTexMain;
  57 static GLuint _uniform_blitblur_uTexMotion;
  58 static GLuint _uniform_blitblur_uBlurStrength;
  59 static GLuint _uniform_blitblur_uBlurExponent;
  60 static void shader_blitblur_uTexMain(int i){
  61    glUniform1i(_uniform_blitblur_uTexMain,i);
  62 }
  63 static void shader_blitblur_uTexMotion(int i){
  64    glUniform1i(_uniform_blitblur_uTexMotion,i);
  65 }
  66 static void shader_blitblur_uBlurStrength(float f){
  67    glUniform1f(_uniform_blitblur_uBlurStrength,f);
  68 }
  69 static void shader_blitblur_uBlurExponent(float f){
  70    glUniform1f(_uniform_blitblur_uBlurExponent,f);
  71 }
  72 static void shader_blitblur_register(void){
  73    vg_shader_register( &_shader_blitblur );
  74 }
  75 static void shader_blitblur_use(void){ glUseProgram(_shader_blitblur.id); }
  76 static void shader_blitblur_link(void){
  77    _uniform_blitblur_uTexMain = glGetUniformLocation( _shader_blitblur.id, "uTexMain" );
  78    _uniform_blitblur_uTexMotion = glGetUniformLocation( _shader_blitblur.id, "uTexMotion" );
  79    _uniform_blitblur_uBlurStrength = glGetUniformLocation( _shader_blitblur.id, "uBlurStrength" );
  80    _uniform_blitblur_uBlurExponent = glGetUniformLocation( _shader_blitblur.id, "uBlurExponent" );
  81 }
  82 #endif /* SHADER_blitblur_H */