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Tweaked the sky coloring a bit to build in structures to allow finer rgb

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control.
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curt
1997-12-23 04:58:38 +00:00
parent 13d4d0777f
commit e4890297a6
1 changed files with 57 additions and 40 deletions
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97
Scenery/sky.c
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@@ -103,8 +103,8 @@ void fgSkyVerticesInit() {
void fgSkyColorsInit() {
struct fgLIGHT *l;
float sun_angle, diff;
float outer_red_param, outer_red_amt, outer_red_diff;
float middle_red_param, middle_red_amt, middle_red_diff;
float outer_param[3], outer_amt[3], outer_diff[3];
float middle_param[3], middle_amt[3], middle_diff[3];
int i, j;
l = &cur_light_params;
@@ -117,46 +117,55 @@ void fgSkyColorsInit() {
if ( (sun_angle > 80.0) && (sun_angle < 100.0) ) {
/* 0.0 - 0.4 */
outer_red_param = (10.0 - fabs(90.0 - sun_angle)) / 25.0;
outer_red_diff = outer_red_param / 6.0;
} else {
outer_red_param = 0.0;
outer_red_diff = 0.0;
}
printf(" outer_red_param = %.2f outer_red_diff = %.2f\n",
outer_red_param, outer_red_diff);
outer_param[0] = (10.0 - fabs(90.0 - sun_angle)) / 25.0;
outer_param[1] = (10.0 - fabs(90.0 - sun_angle)) / 45.0;
outer_param[2] = 0.0;
if ( (sun_angle > 85.0) && (sun_angle < 95.0) ) {
/* 0.0 - 0.4 */
middle_red_param = (5.0 - fabs(90.0 - sun_angle)) / 12.5;
middle_red_diff = middle_red_param / 6.0;
middle_param[0] = (10.0 - fabs(90.0 - sun_angle)) / 40.0;
middle_param[1] = (10.0 - fabs(90.0 - sun_angle)) / 60.0;
middle_param[2] = 0.0;
outer_diff[0] = outer_param[0] / 6.0;
outer_diff[1] = outer_param[1] / 6.0;
outer_diff[2] = outer_param[2] / 6.0;
middle_diff[0] = middle_param[0] / 6.0;
middle_diff[1] = middle_param[1] / 6.0;
middle_diff[2] = middle_param[2] / 6.0;
} else {
middle_red_param = 0.0;
middle_red_diff = 0.0;
outer_param[0] = outer_param[1] = outer_param[2] = 0.0;
middle_param[0] = middle_param[1] = middle_param[2] = 0.0;
outer_diff[0] = outer_diff[1] = outer_diff[2] = 0.0;
middle_diff[0] = middle_diff[1] = middle_diff[2] = 0.0;
}
printf(" middle_red_param = %.2f middle_red_diff = %.2f\n",
middle_red_param, middle_red_diff);
/* printf(" outer_red_param = %.2f outer_red_diff = %.2f\n",
outer_red_param, outer_red_diff); */
/* calculate transition colors between sky and fog */
outer_red_amt = outer_red_param;
middle_red_amt = middle_red_param;
for ( j = 0; j < 3; j++ ) {
outer_amt[j] = outer_param[j];
middle_amt[j] = middle_param[j];
}
for ( i = 0; i < 6; i++ ) {
for ( j = 0; j < 3; j++ ) {
diff = l->sky_color[j] - l->fog_color[j];
inner_color[i][j] = l->sky_color[j] - diff * 0.3;
middle_color[i][j] = l->sky_color[j] - diff * 0.9;
outer_color[i][j] = l->fog_color[j];
middle_color[i][j] = l->sky_color[j] - diff * 0.9 + middle_amt[j];
outer_color[i][j] = l->fog_color[j] + outer_amt[j];
if ( middle_color[i][j] > 1.0 ) { middle_color[i][j] = 1.0; }
if ( outer_color[i][j] > 1.0 ) { outer_color[i][j] = 1.0; }
}
outer_color[i][0] += outer_red_amt;
middle_color[i][0] += middle_red_amt;
if ( outer_color[i][0] > 1.0 ) { outer_color[i][0] = 1.0; }
if ( middle_color[i][0] > 1.0 ) { middle_color[i][0] = 1.0; }
inner_color[i][3] = middle_color[i][3] = outer_color[i][3] =
l->sky_color[3];
outer_red_amt -= outer_red_diff;
middle_red_amt -= middle_red_diff;
for ( j = 0; j < 3; j++ ) {
outer_amt[j] -= outer_diff[j];
middle_amt[j] -= middle_diff[j];
}
printf("inner_color[%d] = %.2f %.2f %.2f %.2f\n", i, inner_color[i][0],
inner_color[i][1], inner_color[i][2], inner_color[i][3]);
@@ -168,26 +177,30 @@ void fgSkyColorsInit() {
outer_color[i][3]);
}
outer_red_amt = 0.0;
middle_red_amt = 0.0;
for ( j = 0; j < 3; j++ ) {
outer_amt[j] = 0.0;
middle_amt[j] = 0.0;
}
for ( i = 6; i < 12; i++ ) {
for ( j = 0; j < 3; j++ ) {
diff = l->sky_color[j] - l->fog_color[j];
inner_color[i][j] = l->sky_color[j] - diff * 0.3;
middle_color[i][j] = l->sky_color[j] - diff * 0.9;
outer_color[i][j] = l->fog_color[j];
middle_color[i][j] = l->sky_color[j] - diff * 0.9 + middle_amt[j];
outer_color[i][j] = l->fog_color[j] + outer_amt[j];
if ( middle_color[i][j] > 1.0 ) { middle_color[i][j] = 1.0; }
if ( outer_color[i][j] > 1.0 ) { outer_color[i][j] = 1.0; }
}
outer_color[i][0] += outer_red_amt;
middle_color[i][0] += middle_red_amt;
if ( outer_color[i][0] > 1.0 ) { outer_color[i][0] = 1.0; }
if ( middle_color[i][0] > 1.0 ) { middle_color[i][0] = 1.0; }
inner_color[i][3] = middle_color[i][3] = outer_color[i][3] =
l->sky_color[3];
outer_red_amt += outer_red_diff;
middle_red_amt += middle_red_diff;
for ( j = 0; j < 3; j++ ) {
outer_amt[j] += outer_diff[j];
middle_amt[j] += middle_diff[j];
}
printf("inner_color[%d] = %.2f %.2f %.2f %.2f\n", i, inner_color[i][0],
inner_color[i][1], inner_color[i][2], inner_color[i][3]);
@@ -302,9 +315,13 @@ void fgSkyRender() {
/* $Log$
/* Revision 1.7 1997/12/22 23:45:48 curt
/* First stab at sunset/sunrise sky glow effects.
/* Revision 1.8 1997/12/23 04:58:38 curt
/* Tweaked the sky coloring a bit to build in structures to allow finer rgb
/* control.
/*
* Revision 1.7 1997/12/22 23:45:48 curt
* First stab at sunset/sunrise sky glow effects.
*
* Revision 1.6 1997/12/22 04:14:34 curt
* Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
*