TESTED_EFFECTS += vignette_effect
TESTED_EFFECTS += slice_effect
TESTED_EFFECTS += complex_modulate_effect
+TESTED_EFFECTS += luma_mix_effect
UNTESTED_EFFECTS = sandbox_effect
UNTESTED_EFFECTS += mirror_effect
inputs.push_back(input2);
return add_effect(effect, inputs);
}
+ Effect *add_effect(Effect *effect, Effect *input1, Effect *input2, Effect *input3) {
+ std::vector<Effect *> inputs;
+ inputs.push_back(input1);
+ inputs.push_back(input2);
+ inputs.push_back(input3);
+ return add_effect(effect, inputs);
+ }
Effect *add_effect(Effect *effect, const std::vector<Effect *> &inputs);
void add_output(const ImageFormat &format, OutputAlphaFormat alpha_format);
--- /dev/null
+#include "luma_mix_effect.h"
+#include "effect_util.h"
+#include "util.h"
+
+using namespace std;
+
+namespace movit {
+
+LumaMixEffect::LumaMixEffect()
+ : transition_width(1.0f), progress(0.5f)
+{
+ register_float("transition_width", &transition_width);
+ register_float("progress", &progress);
+}
+
+string LumaMixEffect::output_fragment_shader()
+{
+ return read_file("luma_mix_effect.frag");
+}
+
+void LumaMixEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
+{
+ Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
+ set_uniform_float(glsl_program_num, prefix, "progress_mul_w_plus_one", progress * (transition_width + 1.0));
+}
+
+} // namespace movit
--- /dev/null
+uniform float PREFIX(progress_mul_w_plus_one);
+
+vec4 FUNCNAME(vec2 tc) {
+ vec4 first = INPUT1(tc);
+ vec4 second = INPUT2(tc);
+
+ // We treat the luma as going from 0 to w, where w is the transition width
+ // (wider means the boundary between transitioned and non-transitioned
+ // will be harder, while w=0 is essentially just a straight fade).
+ // We need to map this 0..w range in the luma image to a (clamped) 0..1
+ // range for how far this pixel has come in a fade. At the very
+ // beginning, we can visualize it like this, where every pixel is in
+ // the state 0.0 (100% first image, 0% second image):
+ //
+ // 0 w
+ // luma: |---------------------|
+ // mix: |----|
+ // 0 1
+ //
+ // Then as we progress, eventually the luma range should move to the right
+ // so that more pixels start moving towards higher mix value:
+ //
+ // 0 w
+ // luma: |---------------------|
+ // mix: |----|
+ // 0 1
+ //
+ // and at the very end, all pixels should be in the state 1.0 (0% first image,
+ // 100% second image):
+ //
+ // 0 w
+ // luma: |---------------------|
+ // mix: |----|
+ // 0 1
+ //
+ // So clearly, it should move (w+1) units to the right, and apart from that
+ // just stay a simple mapping.
+ float w = PREFIX(transition_width);
+ float luma = INPUT3(tc).x * w;
+ float m = clamp((luma - w) + PREFIX(progress_mul_w_plus_one), 0.0, 1.0);
+
+ return mix(first, second, m);
+// return vec4(luma, luma, luma, 1.0);
+}
--- /dev/null
+#ifndef _MOVIT_LUMA_MIX_EFFECT_H
+#define _MOVIT_LUMA_MIX_EFFECT_H 1
+
+// Fade between two images based on a third monochrome one; lighter pixels
+// will be faded before darker pixels. This allows a wide range of different
+// video wipes implemented using a single effect.
+//
+// Note that despite the name, the third input's _red_ channel is what's used
+// for transitions; there is no luma calculation done. If you need that,
+// put a SaturationEffect in front to desaturate (which calculates luma).
+
+#include <string>
+
+#include "effect.h"
+
+namespace movit {
+
+class LumaMixEffect : public Effect {
+public:
+ LumaMixEffect();
+ virtual std::string effect_type_id() const { return "LumaMixEffect"; }
+ std::string output_fragment_shader();
+ virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
+
+ virtual bool needs_srgb_primaries() const { return false; }
+ virtual unsigned num_inputs() const { return 3; }
+ virtual AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
+
+private:
+ float transition_width, progress;
+};
+
+} // namespace movit
+
+#endif // !defined(_MOVIT_MIX_EFFECT_H)
--- /dev/null
+// Unit tests for LumaMixEffect.
+
+#include <GL/glew.h>
+
+#include "effect_chain.h"
+#include "gtest/gtest.h"
+#include "image_format.h"
+#include "input.h"
+#include "luma_mix_effect.h"
+#include "test_util.h"
+
+namespace movit {
+
+TEST(LumaMixEffectTest, HardWipe) {
+ float data_a[] = {
+ 0.0f, 0.25f,
+ 0.75f, 1.0f,
+ };
+ float data_b[] = {
+ 1.0f, 0.5f,
+ 0.65f, 0.6f,
+ };
+ float data_luma[] = {
+ 0.0f, 0.25f,
+ 0.5f, 0.75f,
+ };
+
+ EffectChainTester tester(data_a, 2, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ Effect *input1 = tester.get_chain()->last_added_effect();
+ Effect *input2 = tester.add_input(data_b, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ Effect *input3 = tester.add_input(data_luma, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ Effect *luma_mix_effect = tester.get_chain()->add_effect(new LumaMixEffect(), input1, input2, input3);
+ ASSERT_TRUE(luma_mix_effect->set_float("transition_width", 100000.0f));
+
+ float out_data[4];
+ ASSERT_TRUE(luma_mix_effect->set_float("progress", 0.0f));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(data_a, out_data, 2, 2);
+
+ // Lower right from B, the rest from A.
+ float expected_data_049[] = {
+ 0.0f, 0.25f,
+ 0.75f, 0.6f,
+ };
+ ASSERT_TRUE(luma_mix_effect->set_float("progress", 0.49f));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(expected_data_049, out_data, 2, 2);
+
+ // Lower two from B, the rest from A.
+ float expected_data_051[] = {
+ 0.0f, 0.25f,
+ 0.65f, 0.6f,
+ };
+ ASSERT_TRUE(luma_mix_effect->set_float("progress", 0.51f));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(expected_data_051, out_data, 2, 2);
+
+ ASSERT_TRUE(luma_mix_effect->set_float("progress", 1.0f));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(data_b, out_data, 2, 2);
+}
+
+TEST(LumaMixEffectTest, SoftWipeHalfWayThrough) {
+ float data_a[] = {
+ 0.0f, 0.25f,
+ 0.75f, 1.0f,
+ };
+ float data_b[] = {
+ 1.0f, 0.5f,
+ 0.65f, 0.6f,
+ };
+ float data_luma[] = {
+ 0.0f, 0.25f,
+ 0.5f, 0.75f,
+ };
+ // At this point, the luma range and the mix range should exactly line up,
+ // so we get a straight-up fade by luma.
+ float expected_data[] = {
+ data_a[0] + (data_b[0] - data_a[0]) * data_luma[0],
+ data_a[1] + (data_b[1] - data_a[1]) * data_luma[1],
+ data_a[2] + (data_b[2] - data_a[2]) * data_luma[2],
+ data_a[3] + (data_b[3] - data_a[3]) * data_luma[3],
+ };
+ float out_data[4];
+
+ EffectChainTester tester(data_a, 2, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ Effect *input1 = tester.get_chain()->last_added_effect();
+ Effect *input2 = tester.add_input(data_b, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ Effect *input3 = tester.add_input(data_luma, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ Effect *luma_mix_effect = tester.get_chain()->add_effect(new LumaMixEffect(), input1, input2, input3);
+ ASSERT_TRUE(luma_mix_effect->set_float("transition_width", 1.0f));
+ ASSERT_TRUE(luma_mix_effect->set_float("progress", 0.5f));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(expected_data, out_data, 2, 2);
+}
+
+} // namespace movit
projects / movit / commitdiff