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

   1 #include <GL/glew.h>
   2
   3 #include "effect_chain.h"
   4 #include "slice_effect.h"
   5 #include "effect_util.h"
   6 #include "util.h"
   7
   8 using namespace std;
   9
  10 namespace movit {
  11
  12 SliceEffect::SliceEffect()
  13 {
  14         register_int("input_slice_size", &input_slice_size);
  15         register_int("output_slice_size", &output_slice_size);
  16         register_int("direction", (int *)&direction);
  17 }
  18
  19 string SliceEffect::output_fragment_shader()
  20 {
  21         char buf[256];
  22         sprintf(buf, "#define DIRECTION_VERTICAL %d\n", (direction == VERTICAL));
  23         return buf + read_file("slice_effect.frag");
  24 }
  25
  26 void SliceEffect::inform_input_size(unsigned input_num, unsigned width, unsigned height)
  27 {
  28         assert(input_num == 0);
  29         input_width = width;
  30         input_height = height;
  31 }
  32
  33 void SliceEffect::get_output_size(unsigned *width, unsigned *height,
  34                                   unsigned *virtual_width, unsigned *virtual_height) const
  35 {
  36         if (direction == HORIZONTAL) {
  37                 *width = div_round_up(input_width, input_slice_size) * output_slice_size;
  38                 *height = input_height;
  39         } else {
  40                 *width = input_width;
  41                 *height = div_round_up(input_height, input_slice_size) * output_slice_size;
  42         }
  43         *virtual_width = *width;
  44         *virtual_height = *height;
  45 }
  46
  47 void SliceEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
  48 {
  49         Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
  50
  51         unsigned output_width, output_height;
  52         get_output_size(&output_width, &output_height, &output_width, &output_height);
  53
  54         if (direction == HORIZONTAL) {
  55                 set_uniform_float(glsl_program_num, prefix, "output_coord_to_slice_num", float(output_width) / float(output_slice_size));
  56                 set_uniform_float(glsl_program_num, prefix, "slice_num_to_input_coord", float(input_slice_size) / float(input_width));
  57                 set_uniform_float(glsl_program_num, prefix, "slice_offset_to_input_coord", float(output_slice_size) / float(input_width));
  58         } else {
  59                 set_uniform_float(glsl_program_num, prefix, "output_coord_to_slice_num", float(output_height) / float(output_slice_size));
  60                 set_uniform_float(glsl_program_num, prefix, "slice_num_to_input_coord", float(input_slice_size) / float(input_height));
  61                 set_uniform_float(glsl_program_num, prefix, "slice_offset_to_input_coord", float(output_slice_size) / float(input_height));
  62         }
  63
  64         // Normalized coordinates could potentially cause blurring of the image.
  65         // It isn't critical, but still good practice.
  66         Node *self = chain->find_node_for_effect(this);
  67         glActiveTexture(chain->get_input_sampler(self, 0));
  68         check_error();
  69         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  70         check_error();
  71         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  72         check_error();
  73 }
  74
  75 }  // namespace movit