git.sesse.net Git - movit/blob - blur_effect.cpp

   1 #define GL_GLEXT_PROTOTYPES 1
   2
   3 #include <math.h>
   4 #include <GL/gl.h>
   5 #include <GL/glext.h>
   6
   7 #include "blur_effect.h"
   8 #include "util.h"
   9
  10 BlurEffect::BlurEffect()
  11         : radius(3.0f)
  12 {
  13         register_float("radius", (float *)&radius);
  14 }
  15
  16 std::string BlurEffect::output_fragment_shader()
  17 {
  18         return read_file("blur_effect.frag");
  19 }
  20
  21 void BlurEffect::set_uniforms(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num)
  22 {
  23         Effect::set_uniforms(glsl_program_num, prefix, sampler_num);
  24
  25         //glActiveTexture(GL_TEXTURE0);
  26         //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 3);
  27         //check_error();
  28
  29         set_uniform_float(glsl_program_num, prefix, "pixel_offset", 1.0f / 1280.0f);  // FIXME
  30
  31         // Simple Gaussian weights for now.
  32         float weight[15], total = 0.0f;
  33         for (unsigned i = 0; i < 15; ++i) {
  34                 float z = (i - 7.0f) / radius;
  35                 weight[i] = exp(-(z*z));
  36                 total += weight[i];
  37         }
  38         for (unsigned i = 0; i < 15; ++i) {
  39                 weight[i] /= total;
  40                 printf("%f\n", weight[i]);
  41         }
  42         printf("\n");
  43         set_uniform_float_array(glsl_program_num, prefix, "weight", weight, 15);
  44 }