shaders/blit_transition.h

   1 #ifndef SHADER_blit_transition_H
   2 #define SHADER_blit_transition_H
   3 static void shader_blit_transition_link(void);
   4 static void shader_blit_transition_register(void);
   5 static struct vg_shader _shader_blit_transition = {
   6    .name = "blit_transition",
   7    .link = shader_blit_transition_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/blit_transition.fs",
  26 .static_src =
  27 "out vec4 FragColor;\n"
  28 "in vec2 aUv;\n"
  29 "uniform float uT;\n"
  30 "\n"
  31 "void main(){\n"
  32 "   float d = uT + distance( aUv, vec2(0.5,0.5) );\n"
  33 "\n"
  34 "   vec3 vDither = vec3( dot( vec2( 171.0, 231.0 ), gl_FragCoord.xy) );\n"
  35 "   float dither = fract( vDither.g / 71.0 ) - 0.5;\n"
  36 "\n"
  37 "   if( d+dither < -0.5 )\n"
  38 "      discard;\n"
  39 "\n"
  40 "   FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );\n"
  41 "}\n"
  42 ""},
  43 };
  44
  45 static GLuint _uniform_blit_transition_uInverseRatio;
  46 static GLuint _uniform_blit_transition_uT;
  47 static void shader_blit_transition_uInverseRatio(v2f v){
  48    glUniform2fv(_uniform_blit_transition_uInverseRatio,1,v);
  49 }
  50 static void shader_blit_transition_uT(float f){
  51    glUniform1f(_uniform_blit_transition_uT,f);
  52 }
  53 static void shader_blit_transition_register(void){
  54    vg_shader_register( &_shader_blit_transition );
  55 }
  56 static void shader_blit_transition_use(void){ glUseProgram(_shader_blit_transition.id); }
  57 static void shader_blit_transition_link(void){
  58    _uniform_blit_transition_uInverseRatio = glGetUniformLocation( _shader_blit_transition.id, "uInverseRatio" );
  59    _uniform_blit_transition_uT = glGetUniformLocation( _shader_blit_transition.id, "uT" );
  60 }
  61 #endif /* SHADER_blit_transition_H */