Rearrange soucre files into subdirectories

[libs/gl.git] / source / effects / colorcurve.cpp

diff --git a/source/effects/colorcurve.cpp b/source/effects/colorcurve.cpp
new file mode 100644 (file)
index 0000000..8811b06
--- /dev/null
+++ b/source/effects/colorcurve.cpp
@@ -0,0 +1,124 @@
+#include <cmath>
+#include "color.h"
+#include "colorcurve.h"
+#include "mesh.h"
+#include "renderer.h"
+#include "shader.h"
+#include "texture2d.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+ColorCurve::ColorCurve():
+       shprog("colorcurve.glsl"),
+       quad(get_fullscreen_quad()),
+       linear_sampler(get_linear_sampler()),
+       nearest_sampler(get_nearest_sampler())
+{
+       shdata.uniform("source", 0);
+       shdata.uniform("curve", 1);
+
+       curve.storage(LUMINANCE8, 256, 1);
+       texturing.attach(1, curve, linear_sampler.get());
+
+       set_exposure_adjust(0.0f);
+       set_brightness_response(0.4f);
+       set_linear();
+}
+
+void ColorCurve::set_exposure_adjust(float e)
+{
+       shdata.uniform("exposure", pow(2.0f, e));
+}
+
+void ColorCurve::set_brightness_response(float b)
+{
+       if(b<=0 || b>1)
+               throw invalid_argument("ColorCurve::set_brightness_response");
+       float t = (b<1 ? pow(b, 1/(1-b)) : 0.0f);
+       shdata.uniform("brightness_response", b, t, pow(t, b));
+}
+
+void ColorCurve::set_gamma(float g)
+{
+       if(g<0.1 || g>10)
+               throw invalid_argument("ColorCurve::set_gamma");
+
+       unsigned char curve_data[256];
+       for(unsigned i=0; i<256; ++i)
+               curve_data[i] = pow(i/255.0f, 1/g)*255+0.5f;
+       curve.image(0, curve_data);
+}
+
+void ColorCurve::set_srgb()
+{
+       unsigned char curve_data[256];
+       curve_data[0] = 0;
+       for(unsigned i=1; i<256; ++i)
+               curve_data[i] = to_srgb(i/255.0f)*255+0.5f;
+       curve.image(0, curve_data);
+}
+
+void ColorCurve::set_linear()
+{
+       unsigned char curve_data[256];
+       for(unsigned i=0; i<256; ++i)
+               curve_data[i] = i;
+       curve.image(0, curve_data);
+}
+
+void ColorCurve::render(Renderer &renderer, const Texture2D &color_buf, const Texture2D &)
+{
+       texturing.attach(0, color_buf, nearest_sampler.get());
+
+       Renderer::Push push(renderer);
+       renderer.set_shader_program(&shprog, &shdata);
+       renderer.set_texturing(&texturing);
+       quad->draw(renderer);
+}
+
+
+ColorCurve::Template::Template():
+       exposure_adjust(0.0f),
+       brightness_response(0.4f),
+       gamma(1.0f),
+       srgb(false)
+{ }
+
+ColorCurve *ColorCurve::Template::create(unsigned, unsigned) const
+{
+       RefPtr<ColorCurve> colorcurve = new ColorCurve;
+       colorcurve->set_exposure_adjust(exposure_adjust);
+       colorcurve->set_brightness_response(brightness_response);
+       if(srgb)
+               colorcurve->set_srgb();
+       else
+               colorcurve->set_gamma(gamma);
+       return colorcurve.release();
+}
+
+
+ColorCurve::Template::Loader::Loader(Template &t):
+       DataFile::DerivedObjectLoader<Template, PostProcessor::Template::Loader>(t)
+{
+       add("brightness_response", &Template::brightness_response);
+       add("exposure_adjust", &Template::exposure_adjust);
+       add("gamma", &Loader::gamma);
+       add("srgb", &Loader::srgb);
+}
+
+void ColorCurve::Template::Loader::gamma(float g)
+{
+       obj.gamma = g;
+       obj.srgb = false;
+}
+
+void ColorCurve::Template::Loader::srgb()
+{
+       obj.srgb = true;
+}
+
+} // namespace GL
+} // namespace Msp