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Optimize DrawSphereEx()

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Precalculates sin/cos to eliminate unnecessary calls.
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smalltimewizard 2024-06-24 23:30:14 -04:00 committed by GitHub
parent ec95ee85a3
commit 1db90f956e
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GPG Key ID: B5690EEEBB952194
1 changed files with 25 additions and 18 deletions
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43
src/rmodels.c
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@ -432,29 +432,36 @@ void DrawSphereEx(Vector3 centerPos, float radius, int rings, int slices, Color
rlBegin(RL_TRIANGLES);
rlColor4ub(color.r, color.g, color.b, color.a);
float *cosring;
float *sinring;
float *cosslice;
float *sinslice;
cosring = (float *)RL_CALLOC(rings + 2, sizeof(float));
sinring = (float *)RL_CALLOC(rings + 2, sizeof(float));
cosslice = (float *)RL_CALLOC(slices, sizeof(float));
sinslice = (float *)RL_CALLOC(slices, sizeof(float));
for (int i = 0; i < (rings + 2); i++)
{
cosring[i] = cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*i)); // Precalculate position on unit circle required for each ring
sinring[i] = sinf(DEG2RAD*(270 + (180.0f/(rings + 1))*i));
}
for (int j = 0; j < slices; j++)
{
cosslice[j] = cosf(DEG2RAD*(360.0f*j/slices)); // Precalculate position on unit circle required for each slice
sinslice[j] = sinf(DEG2RAD*(360.0f*j/slices));
}
for (int i = 0; i < (rings + 2); i++)
{
for (int j = 0; j < slices; j++)
{
rlVertex3f(cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*i))*sinf(DEG2RAD*(360.0f*j/slices)),
sinf(DEG2RAD*(270 + (180.0f/(rings + 1))*i)),
cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*i))*cosf(DEG2RAD*(360.0f*j/slices)));
rlVertex3f(cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1)))*sinf(DEG2RAD*(360.0f*(j + 1)/slices)),
sinf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1))),
cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1)))*cosf(DEG2RAD*(360.0f*(j + 1)/slices)));
rlVertex3f(cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1)))*sinf(DEG2RAD*(360.0f*j/slices)),
sinf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1))),
cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1)))*cosf(DEG2RAD*(360.0f*j/slices)));
rlVertex3f(cosring[i]*sinslice[j], sinring[i], cosring[i]*cosslice[j]);
rlVertex3f(cosring[i+1]*sinslice[j+1], sinring[i+1], cosring[i+1]*cosslice[j+1]);
rlVertex3f(cosring[i+1]*sinslice[j], sinring[i+1], cosring[i+1]*cosslice[j]);
rlVertex3f(cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*i))*sinf(DEG2RAD*(360.0f*j/slices)),
sinf(DEG2RAD*(270 + (180.0f/(rings + 1))*i)),
cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*i))*cosf(DEG2RAD*(360.0f*j/slices)));
rlVertex3f(cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i)))*sinf(DEG2RAD*(360.0f*(j + 1)/slices)),
sinf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i))),
cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i)))*cosf(DEG2RAD*(360.0f*(j + 1)/slices)));
rlVertex3f(cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1)))*sinf(DEG2RAD*(360.0f*(j + 1)/slices)),
sinf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1))),
cosf(DEG2RAD*(270 + (180.0f/(rings + 1))*(i + 1)))*cosf(DEG2RAD*(360.0f*(j + 1)/slices)));
rlVertex3f(cosring[i]*sinslice[j], sinring[i], cosring[i]*cosslice[j]);
rlVertex3f(cosring[i]*sinslice[j+1], sinring[i], cosring[i]*cosslice[j+1]);
rlVertex3f(cosring[i+1]*sinslice[j+1], sinring[i+1], cosring[i+1]*cosslice[j+1]);
}
}
rlEnd();