3 #include "effect_chain.h"
4 #include "slice_effect.h"
5 #include "effect_util.h"
12 SliceEffect::SliceEffect()
13 : input_slice_size(1),
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 register_uniform_float("output_coord_to_slice_num", &uniform_output_coord_to_slice_num);
23 register_uniform_float("slice_num_to_input_coord", &uniform_slice_num_to_input_coord);
24 register_uniform_float("slice_offset_to_input_coord", &uniform_slice_offset_to_input_coord);
25 register_uniform_float("offset", &uniform_offset);
28 string SliceEffect::output_fragment_shader()
31 sprintf(buf, "#define DIRECTION_VERTICAL %d\n", (direction == VERTICAL));
32 return buf + read_file("slice_effect.frag");
35 void SliceEffect::inform_input_size(unsigned input_num, unsigned width, unsigned height)
37 assert(input_num == 0);
39 input_height = height;
42 void SliceEffect::get_output_size(unsigned *width, unsigned *height,
43 unsigned *virtual_width, unsigned *virtual_height) const
45 if (direction == HORIZONTAL) {
46 *width = div_round_up(input_width, input_slice_size) * output_slice_size;
47 *height = input_height;
50 *height = div_round_up(input_height, input_slice_size) * output_slice_size;
52 *virtual_width = *width;
53 *virtual_height = *height;
56 void SliceEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
58 Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
60 unsigned output_width, output_height;
61 get_output_size(&output_width, &output_height, &output_width, &output_height);
63 if (direction == HORIZONTAL) {
64 uniform_output_coord_to_slice_num = float(output_width) / float(output_slice_size);
65 uniform_slice_num_to_input_coord = float(input_slice_size) / float(input_width);
66 uniform_slice_offset_to_input_coord = float(output_slice_size) / float(input_width);
67 uniform_offset = float(offset) / float(input_width);
69 uniform_output_coord_to_slice_num = float(output_height) / float(output_slice_size);
70 uniform_slice_num_to_input_coord = float(input_slice_size) / float(input_height);
71 uniform_slice_offset_to_input_coord = float(output_slice_size) / float(input_height);
72 uniform_offset = float(offset) / float(input_height);
75 // Normalized coordinates could potentially cause blurring of the image.
76 // It isn't critical, but still good practice.
77 Node *self = chain->find_node_for_effect(this);
78 glActiveTexture(chain->get_input_sampler(self, 0));
80 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
82 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);