Add an effect for complex multiplication.

[movit] / complex_modulate_effect.cpp

diff --git a/complex_modulate_effect.cpp b/complex_modulate_effect.cpp
new file mode 100644 (file)
index 0000000..7048608
--- /dev/null
+++ b/complex_modulate_effect.cpp
@@ -0,0 +1,60 @@
+#include <GL/glew.h>
+
+#include "complex_modulate_effect.h"
+#include "effect_chain.h"
+#include "effect_util.h"
+#include "util.h"
+
+using namespace std;
+
+namespace movit {
+
+ComplexModulateEffect::ComplexModulateEffect()
+       : num_repeats_x(1), num_repeats_y(1)
+{
+       register_int("num_repeats_x", &num_repeats_x);
+       register_int("num_repeats_y", &num_repeats_y);
+}
+
+string ComplexModulateEffect::output_fragment_shader()
+{
+       return read_file("complex_modulate_effect.frag");
+}
+
+void ComplexModulateEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
+{
+       Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
+
+       float num_repeats[] = { num_repeats_x, num_repeats_y };
+       set_uniform_vec2(glsl_program_num, prefix, "num_repeats", num_repeats);
+
+       // Set the secondary input to repeat (and nearest while we're at it).
+       Node *self = chain->find_node_for_effect(this);
+       glActiveTexture(chain->get_input_sampler(self, 1));
+       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();
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+       check_error();
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+       check_error();
+}
+
+void ComplexModulateEffect::inform_input_size(unsigned input_num, unsigned width, unsigned height)
+{
+       if (input_num == 0) {
+               primary_input_width = width;
+               primary_input_height = height;
+       }
+}
+
+void ComplexModulateEffect::get_output_size(unsigned *width, unsigned *height,
+                                            unsigned *virtual_width, unsigned *virtual_height) const
+{
+       *width = *virtual_width = primary_input_width;
+       *height = *virtual_height = primary_input_height;
+}
+
+}  // namespace movit