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mode7: optimize fixed starfield a bit

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This commit is contained in:
Vince Weaver 2017-12-28 23:33:31 -05:00
parent 3b53300ca2
commit 83090145de
1 changed files with 10 additions and 7 deletions
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17
gr-sim/starfield_fixed.c
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@ -16,7 +16,6 @@ struct star_type {
struct fixed_type x;
struct fixed_type y;
int z;
int color;
};
static void double_to_fixed(double d, struct fixed_type *f) {
@ -74,7 +73,7 @@ static struct star_type stars[NUMSTARS];
static int random_table[256];
static int random_pointer=0;
static int z_table[256];
static int z_table[64];
static void random_star(int i) {
@ -149,6 +148,7 @@ int main(int argc, char **argv) {
double g;
struct fixed_type gf;
int color;
i=0;
for(g=16.0;g>0;g-=0.25) {
@ -177,15 +177,13 @@ int main(int argc, char **argv) {
/* Set color */
for(i=0;i<NUMSTARS;i++) {
if (stars[i].z<16) stars[i].color=5;
else if (stars[i].z<32) stars[i].color=13;
else stars[i].color=15;
}
/* draw stars */
for(i=0;i<NUMSTARS;i++) {
// int tempx,tempy;
struct fixed_type dx,dy,temp;
temp.i=0;//z_table[stars[i].z];
@ -219,6 +217,11 @@ int main(int argc, char **argv) {
dy.i+=20;
if (stars[i].z<16) color=5;
else if (stars[i].z<32) color=13;
else color=15;
if ((dx.i<0) || (dy.i<0) || (dx.i>=40) ||
(dy.i>=40)) {
@ -229,7 +232,7 @@ int main(int argc, char **argv) {
// printf("EEK! %2X.%2X\n",
// stars[i].z,stars[i].z);
// }
color_equals(stars[i].color);
color_equals(color);
basic_plot(dx.i,dy.i);
}