Merge branch 'master' into epoxy

[movit] / slice_effect.cpp

diff --git a/slice_effect.cpp b/slice_effect.cpp
new file mode 100644 (file)
index 0000000..3cdd415
--- /dev/null
+++ b/slice_effect.cpp
@@ -0,0 +1,76 @@
+#include <epoxy/gl.h>
+
+#include "slice_effect.h"
+#include "effect_util.h"
+#include "util.h"
+
+using namespace std;
+
+namespace movit {
+
+SliceEffect::SliceEffect()
+{
+       register_int("input_slice_size", &input_slice_size);
+       register_int("output_slice_size", &output_slice_size);
+       register_int("direction", (int *)&direction);
+}
+
+string SliceEffect::output_fragment_shader()
+{
+       char buf[256];
+       sprintf(buf, "#define DIRECTION_VERTICAL %d\n", (direction == VERTICAL));
+       return buf + read_file("slice_effect.frag");
+}
+       
+void SliceEffect::inform_input_size(unsigned input_num, unsigned width, unsigned height)
+{
+       assert(input_num == 0);
+       input_width = width;
+       input_height = height;
+}
+
+void SliceEffect::get_output_size(unsigned *width, unsigned *height,
+                                  unsigned *virtual_width, unsigned *virtual_height) const
+{
+       if (direction == HORIZONTAL) {
+               *width = div_round_up(input_width, input_slice_size) * output_slice_size;
+               *height = input_height; 
+       } else {
+               *width = input_width;   
+               *height = div_round_up(input_height, input_slice_size) * output_slice_size;
+       }
+       *virtual_width = *width;
+       *virtual_height = *height;
+}
+
+void SliceEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
+{
+       Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
+
+       unsigned output_width, output_height;
+       get_output_size(&output_width, &output_height, &output_width, &output_height);
+
+       if (direction == HORIZONTAL) {
+               set_uniform_float(glsl_program_num, prefix, "output_coord_to_slice_num", float(output_width) / float(output_slice_size));
+               set_uniform_float(glsl_program_num, prefix, "slice_num_to_input_coord", float(input_slice_size) / float(input_width));
+               set_uniform_float(glsl_program_num, prefix, "slice_offset_to_input_coord", float(output_slice_size) / float(input_width));
+       } else {
+               set_uniform_float(glsl_program_num, prefix, "output_coord_to_slice_num", float(output_height) / float(output_slice_size));
+               set_uniform_float(glsl_program_num, prefix, "slice_num_to_input_coord", float(input_slice_size) / float(input_height));
+               set_uniform_float(glsl_program_num, prefix, "slice_offset_to_input_coord", float(output_slice_size) / float(input_height));
+       }
+
+       // Normalized coordinates could potentially cause blurring of the
+       // image; it's not critical, but we have set changes_output_size()
+       // and needs_texture_bounce(), so simply turning off the interpolation
+       // is allowed.
+       assert(*sampler_num == 1);
+       glActiveTexture(GL_TEXTURE0);
+       check_error();
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+       check_error();
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+       check_error();
+}
+
+}  // namespace movit