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adjust gamma based on time of day

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This commit is contained in:
Erik Hofman 2010-07-17 15:02:06 +02:00
parent 9da9364a98
commit 913726cb0e
1 changed files with 8 additions and 5 deletions
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13
src/Time/light.cxx
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@ -326,6 +326,7 @@ void FGLight::update_adj_fog_color () {
}
double hor_rotation, vert_rotation;
static float gamma = system_gamma;
// first determine the difference between our view angle and local
// direction to the sun
@ -340,8 +341,8 @@ void FGLight::update_adj_fog_color () {
//
SGVec4f color = thesky->get_scene_color();
gamma_restore_rgb( _fog_color.data() );
gamma_restore_rgb( _sky_color.data() );
gamma_restore_rgb( _fog_color.data(), gamma );
gamma_restore_rgb( _sky_color.data(), gamma );
// Calculate the fog color in the direction of the sun for
// sunrise/sunset effects.
@ -367,15 +368,17 @@ void FGLight::update_adj_fog_color () {
float rf2 = avf * pow(rf1*rf1, 1/sif) * 1.0639;
float rf3 = 1.0 - rf2;
gamma = system_gamma * (0.9 - sif*avf);
_adj_fog_color[0] = rf3 * _fog_color[0] + rf2 * s_red;
_adj_fog_color[1] = rf3 * _fog_color[1] + rf2 * s_green;
_adj_fog_color[2] = rf3 * _fog_color[2] + rf2 * s_blue;
gamma_correct_rgb( _adj_fog_color.data() );
gamma_correct_rgb( _adj_fog_color.data(), gamma);
// make sure the colors have their original value before they are being
// used by the rest of the program.
//
gamma_correct_rgb( _fog_color.data() );
gamma_correct_rgb( _sky_color.data() );
gamma_correct_rgb( _fog_color.data(), gamma );
gamma_correct_rgb( _sky_color.data(), gamma );
}