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

   1 #include <epoxy/gl.h>
   2 #include <assert.h>
   3 #include <math.h>
   4
   5 #include "effect_util.h"
   6 #include "util.h"
   7 #include "vignette_effect.h"
   8
   9 using namespace std;
  10
  11 namespace movit {
  12
  13 VignetteEffect::VignetteEffect()
  14         : center(0.5f, 0.5f),
  15           uniform_aspect_correction(1.0f, 1.0f),
  16           uniform_flipped_center(0.5f, 0.5f),
  17           radius(0.3f),
  18           inner_radius(0.3f)
  19 {
  20         register_vec2("center", (float *)&center);
  21         register_float("radius", (float *)&radius);
  22         register_float("inner_radius", (float *)&inner_radius);
  23         register_uniform_float("pihalf_div_radius", &uniform_pihalf_div_radius);
  24         register_uniform_vec2("aspect_correction", (float *)&uniform_aspect_correction);
  25         register_uniform_vec2("flipped_center", (float *)&uniform_flipped_center);
  26 }
  27
  28 string VignetteEffect::output_fragment_shader()
  29 {
  30         return read_file("vignette_effect.frag");
  31 }
  32
  33 void VignetteEffect::inform_input_size(unsigned input_num, unsigned width, unsigned height) {
  34         assert(input_num == 0);
  35         if (width >= height) {
  36                 uniform_aspect_correction = Point2D(float(width) / float(height), 1.0f);
  37         } else {
  38                 uniform_aspect_correction = Point2D(1.0f, float(height) / float(width));
  39         }
  40 }
  41
  42 void VignetteEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
  43 {
  44         Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
  45
  46         uniform_pihalf_div_radius = 0.5 * M_PI / radius;
  47         uniform_flipped_center = Point2D(center.x, 1.0f - center.y);
  48 }
  49
  50 }  // namespace movit