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         : input_slice_size(1),
  14           output_slice_size(1),
  15           offset(0),
  16           direction(VERTICAL)
  17 {
  18         register_int("input_slice_size", &input_slice_size);
  19         register_int("output_slice_size", &output_slice_size);
  20         register_int("offset", &offset);
  21         register_int("direction", (int *)&direction);
  22 }
  23
  24 string SliceEffect::output_fragment_shader()
  25 {
  26         char buf[256];
  27         sprintf(buf, "#define DIRECTION_VERTICAL %d\n", (direction == VERTICAL));
  28         return buf + read_file("slice_effect.frag");
  29 }
  30
  31 void SliceEffect::inform_input_size(unsigned input_num, unsigned width, unsigned height)
  32 {
  33         assert(input_num == 0);
  34         input_width = width;
  35         input_height = height;
  36 }
  37
  38 void SliceEffect::get_output_size(unsigned *width, unsigned *height,
  39                                   unsigned *virtual_width, unsigned *virtual_height) const
  40 {
  41         if (direction == HORIZONTAL) {
  42                 *width = div_round_up(input_width, input_slice_size) * output_slice_size;
  43                 *height = input_height;
  44         } else {
  45                 *width = input_width;
  46                 *height = div_round_up(input_height, input_slice_size) * output_slice_size;
  47         }
  48         *virtual_width = *width;
  49         *virtual_height = *height;
  50 }
  51
  52 void SliceEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
  53 {
  54         Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
  55
  56         unsigned output_width, output_height;
  57         get_output_size(&output_width, &output_height, &output_width, &output_height);
  58
  59         if (direction == HORIZONTAL) {
  60                 set_uniform_float(glsl_program_num, prefix, "output_coord_to_slice_num", float(output_width) / float(output_slice_size));
  61                 set_uniform_float(glsl_program_num, prefix, "slice_num_to_input_coord", float(input_slice_size) / float(input_width));
  62                 set_uniform_float(glsl_program_num, prefix, "slice_offset_to_input_coord", float(output_slice_size) / float(input_width));
  63                 set_uniform_float(glsl_program_num, prefix, "offset", float(offset) / float(input_width));
  64         } else {
  65                 set_uniform_float(glsl_program_num, prefix, "output_coord_to_slice_num", float(output_height) / float(output_slice_size));
  66                 set_uniform_float(glsl_program_num, prefix, "slice_num_to_input_coord", float(input_slice_size) / float(input_height));
  67                 set_uniform_float(glsl_program_num, prefix, "slice_offset_to_input_coord", float(output_slice_size) / float(input_height));
  68                 set_uniform_float(glsl_program_num, prefix, "offset", float(offset) / float(input_height));
  69         }
  70
  71         // Normalized coordinates could potentially cause blurring of the image.
  72         // It isn't critical, but still good practice.
  73         Node *self = chain->find_node_for_effect(this);
  74         glActiveTexture(chain->get_input_sampler(self, 0));
  75         check_error();
  76         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  77         check_error();
  78         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  79         check_error();
  80 }
  81
  82 }  // namespace movit