diff options
Diffstat (limited to 'indra/llrender/llrendersphere.cpp')
| -rw-r--r-- | indra/llrender/llrendersphere.cpp | 86 |
1 files changed, 47 insertions, 39 deletions
diff --git a/indra/llrender/llrendersphere.cpp b/indra/llrender/llrendersphere.cpp index e22b753923..212963f270 100644 --- a/indra/llrender/llrendersphere.cpp +++ b/indra/llrender/llrendersphere.cpp @@ -68,45 +68,6 @@ void drawSolidSphere(GLdouble radius, GLint slices, GLint stacks) } -// lat = 0 is Z-axis -// lon = 0, lat = 90 at X-axis -void lat2xyz(LLVector3 * result, F32 lat, F32 lon) -{ - // Convert a latitude and longitude to x,y,z on a normal sphere and return it in result - F32 r; - result->mV[VX] = (F32) (cos(lon * DEG_TO_RAD) * sin(lat * DEG_TO_RAD)); - result->mV[VY] = (F32) (sin(lon * DEG_TO_RAD) * sin(lat * DEG_TO_RAD)); - r = (F32) pow(result->mV[VX] * result->mV[VX] + result->mV[VY] * result->mV[VY], 0.5f); - if (r == 1.0f) - { - result->mV[VZ] = 0.0f; - } - else - { - result->mV[VZ] = (F32) pow(1 - r*r, 0.5f); - if (lat > 90.01) - { - result->mV[VZ] *= -1.0; - } - } -} - -void lat2xyz_rad(LLVector3 * result, F32 lat, F32 lon) -{ - // Convert a latitude and longitude to x,y,z on a normal sphere and return it in result - F32 r; - result->mV[VX] = (F32) (cos(lon) * sin(lat)); - result->mV[VY] = (F32) (sin(lon) * sin(lat)); - r = (F32) pow(result->mV[VX] * result->mV[VX] + result->mV[VY] * result->mV[VY], 0.5f); - if (r == 1.0f) - result->mV[VZ] = 0.0f; - else - { - result->mV[VZ] = (F32) pow(1 - r*r, 0.5f); - if (lat > F_PI_BY_TWO) result->mV[VZ] *= -1.0; - } -} - // A couple thoughts on sphere drawing: // 1) You need more slices than stacks, but little less than 2:1 // 2) At low LOD, setting stacks to an odd number avoids a "band" around the equator, making things look smoother @@ -181,3 +142,50 @@ void LLRenderSphere::render() { glCallList(mDList[0]); } + +inline LLVector3 polar_to_cart(F32 latitude, F32 longitude) +{ + return LLVector3(sin(F_TWO_PI * latitude) * cos(F_TWO_PI * longitude), + sin(F_TWO_PI * latitude) * sin(F_TWO_PI * longitude), + cos(F_TWO_PI * latitude)); +} + + +void LLRenderSphere::renderGGL() +{ + S32 const LATITUDE_SLICES = 20; + S32 const LONGITUDE_SLICES = 30; + + if (mSpherePoints.empty()) + { + mSpherePoints.resize(LATITUDE_SLICES + 1); + for (S32 lat_i = 0; lat_i < LATITUDE_SLICES + 1; lat_i++) + { + mSpherePoints[lat_i].resize(LONGITUDE_SLICES + 1); + for (S32 lon_i = 0; lon_i < LONGITUDE_SLICES + 1; lon_i++) + { + F32 lat = (F32)lat_i / LATITUDE_SLICES; + F32 lon = (F32)lon_i / LONGITUDE_SLICES; + + mSpherePoints[lat_i][lon_i] = polar_to_cart(lat, lon); + } + } + } + + gGL.begin(LLRender::TRIANGLES); + + for (S32 lat_i = 0; lat_i < LATITUDE_SLICES; lat_i++) + { + for (S32 lon_i = 0; lon_i < LONGITUDE_SLICES; lon_i++) + { + gGL.vertex3fv(mSpherePoints[lat_i][lon_i].mV); + gGL.vertex3fv(mSpherePoints[lat_i][lon_i+1].mV); + gGL.vertex3fv(mSpherePoints[lat_i+1][lon_i].mV); + + gGL.vertex3fv(mSpherePoints[lat_i+1][lon_i].mV); + gGL.vertex3fv(mSpherePoints[lat_i][lon_i+1].mV); + gGL.vertex3fv(mSpherePoints[lat_i+1][lon_i+1].mV); + } + } + gGL.end(); +} |