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 .orig_file = "shaders/blit.vs",
  11 .static_src =
  12 "layout (location=0) in vec2 a_co;\n"
  13 "out vec2 aUv;\n"
  14 "\n"
  15 "uniform vec2 uInverseRatio;\n"
  16 "\n"
  17 "void main()\n"
  18 "{\n"
  19 "   gl_Position = vec4(a_co*2.0-1.0,0.0,1.0);\n"
  20 "   aUv = a_co * uInverseRatio;\n"
  21 "}\n"
  22 ""},
  23    .fs =
  24 {
  25 .orig_file = "shaders/blitblur.fs",
  26 .static_src =
  27 "out vec4 FragColor;\n"
  28 "uniform sampler2D uTexMain;\n"
  29 "uniform sampler2D uTexMotion;\n"
  30 "uniform float uBlurStrength;\n"
  31 "uniform vec2 uOverrideDir;\n"
  32 "\n"
  33 "in vec2 aUv;\n"
  34 "\n"
  35 "vec2 rand_hash22( vec2 p )\n"
  36 "{\n"
  37 "   vec3 p3 = fract(vec3(p.xyx) * 213.8976123);\n"
  38 "   p3 += dot(p3, p3.yzx+19.19);\n"
  39 "   return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));\n"
  40 "}\n"
  41 "\n"
  42 "void main()\n"
  43 "{\n"
  44 "   vec2 vcenter = (aUv-vec2(0.5))*vec2(2.0);\n"
  45 "   vec2 vrand = rand_hash22( aUv ) * 2.0 - vec2(1.0);\n"
  46 "   vec2 vrand1 = rand_hash22( vrand ) * 2.0 - vec2(1.0);\n"
  47 "   \n"
  48 "   vec2 vdir = texture( uTexMotion, aUv ).xy * uBlurStrength + uOverrideDir;\n"
  49 "\n"
  50 "   vec4 vcolour0 = texture( uTexMain, aUv + vdir*vrand.x );\n"
  51 "   vec4 vcolour1 = texture( uTexMain, aUv + vdir*vrand.y );\n"
  52 "   vec4 vcolour2 = texture( uTexMain, aUv + vdir*vrand1.x );\n"
  53 "   vec4 vcolour3 = texture( uTexMain, aUv + vdir*vrand1.y );\n"
  54 "\n"
  55 "   FragColor = ( vcolour0 + vcolour1 + vcolour2 + vcolour3 ) * 0.25;\n"
  56 "}\n"
  57 ""},
  58 };
  59
  60 static GLuint _uniform_blitblur_uInverseRatio;
  61 static GLuint _uniform_blitblur_uTexMain;
  62 static GLuint _uniform_blitblur_uTexMotion;
  63 static GLuint _uniform_blitblur_uBlurStrength;
  64 static GLuint _uniform_blitblur_uOverrideDir;
  65 static void shader_blitblur_uInverseRatio(v2f v){
  66    glUniform2fv(_uniform_blitblur_uInverseRatio,1,v);
  67 }
  68 static void shader_blitblur_uTexMain(int i){
  69    glUniform1i(_uniform_blitblur_uTexMain,i);
  70 }
  71 static void shader_blitblur_uTexMotion(int i){
  72    glUniform1i(_uniform_blitblur_uTexMotion,i);
  73 }
  74 static void shader_blitblur_uBlurStrength(float f){
  75    glUniform1f(_uniform_blitblur_uBlurStrength,f);
  76 }
  77 static void shader_blitblur_uOverrideDir(v2f v){
  78    glUniform2fv(_uniform_blitblur_uOverrideDir,1,v);
  79 }
  80 static void shader_blitblur_register(void){
  81    vg_shader_register( &_shader_blitblur );
  82 }
  83 static void shader_blitblur_use(void){ glUseProgram(_shader_blitblur.id); }
  84 static void shader_blitblur_link(void){
  85    _uniform_blitblur_uInverseRatio = glGetUniformLocation( _shader_blitblur.id, "uInverseRatio" );
  86    _uniform_blitblur_uTexMain = glGetUniformLocation( _shader_blitblur.id, "uTexMain" );
  87    _uniform_blitblur_uTexMotion = glGetUniformLocation( _shader_blitblur.id, "uTexMotion" );
  88    _uniform_blitblur_uBlurStrength = glGetUniformLocation( _shader_blitblur.id, "uBlurStrength" );
  89    _uniform_blitblur_uOverrideDir = glGetUniformLocation( _shader_blitblur.id, "uOverrideDir" );
  90 }
  91 #endif /* SHADER_blitblur_H */