From 8bf38d18027c739dc015144a7f7a59b658011a03 Mon Sep 17 00:00:00 2001 From: Andy Spencer Date: Mon, 25 Oct 2010 05:03:26 +0000 Subject: [PATCH] Add sky effects --- src/plugins/env.c | 43 +++++++++++++++++++++---------------------- 1 file changed, 21 insertions(+), 22 deletions(-) diff --git a/src/plugins/env.c b/src/plugins/env.c index 1a0110c..2952487 100644 --- a/src/plugins/env.c +++ b/src/plugins/env.c @@ -44,38 +44,37 @@ static void expose(GisCallback *callback, GisOpenGL *opengl, gpointer _env) gis_viewer_get_location(env->viewer, &lat, &lon, &elev); /* Misc */ - gdouble rg = MAX(0, 1-(elev/20000)); - gdouble blue = MAX(0, 1-(elev/50000)); - glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f); + gdouble rg = MAX(0, 1-(elev/40000)); + gdouble blue = MAX(0, 1-(elev/100000)); + glClearColor(MIN(0.4,rg), MIN(0.4,rg), MIN(1,blue), 1.0f); glClear(GL_COLOR_BUFFER_BIT); /* Attempt to render an atmosphere */ - /* glEnable(GL_COLOR_MATERIAL); glDisable(GL_CULL_FACE); glDisable(GL_LIGHTING); + glMatrixMode(GL_MODELVIEW); + glBlendFunc(GL_SRC_ALPHA, GL_DST_ALPHA); + gis_viewer_center_position(env->viewer, lat, lon, -EARTH_R); - glBlendFunc(GL_ONE, GL_ONE); + gdouble ds = EARTH_R+elev; // distance to self + gdouble da = EARTH_R+300000; // distance to top of atmosphere + gdouble dg = EARTH_R-100000; // distance to top of atmosphere + gdouble ang = acos(EARTH_R/ds); // angle to horizon + ang = MAX(ang,0.1); - glMatrixMode(GL_MODELVIEW); + gdouble ar = sin(ang)*da; // top of quad fan "atomosphere"j + gdouble az = cos(ang)*da; // + + gdouble gr = sin(ang)*dg; // bottom of quad fan "ground" + gdouble gz = cos(ang)*dg; // - elev = -EARTH_R; - for (elev = -EARTH_R; elev < 0; elev += EARTH_R/10) { - glPushMatrix(); - glColor4f(0.3, 0.3, 1.0, 0.2); - gis_viewer_center_position(env->viewer, lat, lon, elev); - - glBegin(GL_TRIANGLE_FAN); - glVertex3f(0, 0, 0); - for (gdouble i = 0; i <= 2*G_PI; i += G_PI/10) { - gint rad = 1*EARTH_R + 300000; - glVertex3f(rad*sin(i), rad*cos(i), 0); - g_message("%f %f %f", 3*EARTH_R*sin(i), 3*EARTH_R*cos(i), 0.); - } - glEnd(); - glPopMatrix(); + glBegin(GL_QUAD_STRIP); + for (gdouble i = 0; i <= 2*G_PI; i += G_PI/30) { + glColor4f(0.3, 0.3, 1.0, 1.0); glVertex3f(gr*sin(i), gr*cos(i), gz); + glColor4f(0.3, 0.3, 1.0, 0.0); glVertex3f(ar*sin(i), ar*cos(i), az); } - */ + glEnd(); } -- 2.43.2