merge from texture-pipeline

1 files changed, 155 insertions, 2 deletions

diff --git a/indra/newview/llface.cpp b/indra/newview/llface.cpp
index 8ec448e281..c54b83d865 100644
--- a/indra/newview/llface.cpp
+++ b/indra/newview/llface.cpp
@@ -52,6 +52,7 @@
 #include "llvovolume.h"
 #include "pipeline.h"
 #include "llviewerregion.h"
+#include "llviewerwindow.h"
 
 #define LL_MAX_INDICES_COUNT 1000000
 
@@ -175,6 +176,9 @@ void LLFace::init(LLDrawable* drawablep, LLViewerObject* objp)
 	mLastIndicesCount = mIndicesCount;
 	mLastIndicesIndex = mIndicesIndex;
 
+	mImportanceToCamera = 0.f ;
+	mBoundingSphereRadius = 0.0f ;
+
 	mAtlasInfop = NULL ;
 	mUsingAtlas  = FALSE ;
 }
@@ -186,6 +190,7 @@ void LLFace::destroy()
 	{
 		mTexture->removeFace(this) ;
 	}
+	
 	if (mDrawPoolp)
 	{
 		mDrawPoolp->removeFace(this);
@@ -207,7 +212,7 @@ void LLFace::destroy()
 			}
 		}
 	}
-
+	
 	setDrawInfo(NULL);
 	
 	removeAtlas();
@@ -256,6 +261,7 @@ void LLFace::setPool(LLFacePool* new_pool, LLViewerTexture *texturep)
 		}
 		mDrawPoolp = new_pool;
 	}
+	
 	setTexture(texturep) ;
 }
 
@@ -750,7 +756,9 @@ BOOL LLFace::genVolumeBBoxes(const LLVolume &volume, S32 f,
 		}
 
 		mCenterLocal = (newMin+newMax)*0.5f;
-		
+		LLVector3 tmp = (newMin - newMax) ;
+		mBoundingSphereRadius = tmp.length() * 0.5f ;
+
 		updateCenterAgent();
 	}
 
@@ -1314,6 +1322,151 @@ BOOL LLFace::getGeometryVolume(const LLVolume& volume,
 	return TRUE;
 }
 
+const F32 LEAST_IMPORTANCE = 0.05f ;
+const F32 LEAST_IMPORTANCE_FOR_LARGE_IMAGE = 0.3f ;
+
+F32 LLFace::getTextureVirtualSize()
+{
+	F32 radius;
+	F32 cos_angle_to_view_dir;
+	mPixelArea = calcPixelArea(cos_angle_to_view_dir, radius);
+
+	if (mPixelArea <= 0)
+	{
+		return 0.f;
+	}
+
+	//get area of circle in texture space
+	LLVector2 tdim = mTexExtents[1] - mTexExtents[0];
+	F32 texel_area = (tdim * 0.5f).lengthSquared()*3.14159f;
+	if (texel_area <= 0)
+	{
+		// Probably animated, use default
+		texel_area = 1.f;
+	}
+
+	//apply texel area to face area to get accurate ratio
+	//face_area /= llclamp(texel_area, 1.f/64.f, 16.f);
+	F32 face_area = mPixelArea / llclamp(texel_area, 0.015625f, 128.f);
+
+	if(face_area > LLViewerTexture::sMaxSmallImageSize)
+	{
+		if(mImportanceToCamera < LEAST_IMPORTANCE) //if the face is not important, do not load hi-res.
+		{
+			static const F32 MAX_LEAST_IMPORTANCE_IMAGE_SIZE = 128.0f * 128.0f ;
+			face_area = llmin(face_area * 0.5f, MAX_LEAST_IMPORTANCE_IMAGE_SIZE) ;
+		}
+		else if(face_area > LLViewerTexture::sMinLargeImageSize) //if is large image, shrink face_area by considering the partial overlapping.
+		{
+			if(mImportanceToCamera < LEAST_IMPORTANCE_FOR_LARGE_IMAGE)//if the face is not important, do not load hi-res.
+			{
+				face_area = LLViewerTexture::sMinLargeImageSize ;
+			}	
+			else if(mTexture.notNull() && mTexture->isLargeImage())
+			{		
+				face_area *= adjustPartialOverlapPixelArea(cos_angle_to_view_dir, radius );
+			}			
+		}
+	}
+
+	return face_area;
+}
+
+F32 LLFace::calcPixelArea(F32& cos_angle_to_view_dir, F32& radius)
+{
+	//get area of circle around face
+	LLVector3 center = getPositionAgent();
+	LLVector3 size = (mExtents[1] - mExtents[0]) * 0.5f;
+	
+	LLVector3 lookAt = center - LLViewerCamera::getInstance()->getOrigin();
+	F32 dist = lookAt.normVec() ;
+
+	//get area of circle around node
+	F32 app_angle = atanf(size.length()/dist);
+	radius = app_angle*LLDrawable::sCurPixelAngle;
+	F32 face_area = radius*radius * 3.14159f;
+
+	if(dist < mBoundingSphereRadius) //camera is very close
+	{
+		cos_angle_to_view_dir = 1.0f ;
+		mImportanceToCamera = 1.0f ;
+	}
+	else
+	{
+		cos_angle_to_view_dir = lookAt * LLViewerCamera::getInstance()->getXAxis() ;	
+		mImportanceToCamera = LLFace::calcImportanceToCamera(cos_angle_to_view_dir, dist) ;
+	}
+
+	return face_area ;
+}
+
+//the projection of the face partially overlaps with the screen
+F32 LLFace::adjustPartialOverlapPixelArea(F32 cos_angle_to_view_dir, F32 radius )
+{
+	F32 screen_radius = (F32)llmax(gViewerWindow->getWindowDisplayWidth(), gViewerWindow->getWindowDisplayHeight()) ;
+	F32 center_angle = acosf(cos_angle_to_view_dir) ;
+	F32 d = center_angle * LLDrawable::sCurPixelAngle ;
+
+	if(d + radius > screen_radius + 5.f)
+	{
+		//----------------------------------------------
+		//calculate the intersection area of two circles
+		//F32 radius_square = radius * radius ;
+		//F32 d_square = d * d ;
+		//F32 screen_radius_square = screen_radius * screen_radius ;
+		//face_area = 
+		//	radius_square * acosf((d_square + radius_square - screen_radius_square)/(2 * d * radius)) +
+		//	screen_radius_square * acosf((d_square + screen_radius_square - radius_square)/(2 * d * screen_radius)) -
+		//	0.5f * sqrtf((-d + radius + screen_radius) * (d + radius - screen_radius) * (d - radius + screen_radius) * (d + radius + screen_radius)) ;			
+		//----------------------------------------------
+
+		//the above calculation is too expensive
+		//the below is a good estimation: bounding box of the bounding sphere:
+		F32 alpha = 0.5f * (radius + screen_radius - d) / radius ;
+		alpha = llclamp(alpha, 0.f, 1.f) ;
+		return alpha * alpha ;
+	}
+	return 1.0f ;
+}
+
+const S8 FACE_IMPORTANCE_LEVEL = 4 ;
+const F32 FACE_IMPORTANCE_TO_CAMERA_OVER_DISTANCE[FACE_IMPORTANCE_LEVEL][2] = //{distance, importance_weight}
+	{{16.1f, 1.0f}, {32.1f, 0.5f}, {48.1f, 0.2f}, {96.1f, 0.05f} } ;
+const F32 FACE_IMPORTANCE_TO_CAMERA_OVER_ANGLE[FACE_IMPORTANCE_LEVEL][2] =    //{cos(angle), importance_weight}
+	{{0.985f /*cos(10 degrees)*/, 1.0f}, {0.94f /*cos(20 degrees)*/, 0.8f}, {0.866f /*cos(30 degrees)*/, 0.64f}, {0.0f, 0.36f}} ;
+
+//static 
+F32 LLFace::calcImportanceToCamera(F32 cos_angle_to_view_dir, F32 dist)
+{
+	F32 importance = 0.f ;
+	
+	if(cos_angle_to_view_dir > LLViewerCamera::getInstance()->getCosHalfFov() && 
+		dist < FACE_IMPORTANCE_TO_CAMERA_OVER_DISTANCE[FACE_IMPORTANCE_LEVEL - 1][0]) 
+	{
+		F32 camera_moving_speed = LLViewerCamera::getInstance()->getAverageSpeed() ;
+		F32 camera_angular_speed = LLViewerCamera::getInstance()->getAverageAngularSpeed();
+
+		if(camera_moving_speed > 10.0f || camera_angular_speed > 1.0f)
+		{
+			//if camera moves or rotates too fast, ignore the importance factor
+			return 0.f ;
+		}
+		
+		//F32 camera_relative_speed = camera_moving_speed * (lookAt * LLViewerCamera::getInstance()->getVelocityDir()) ;
+		
+		S32 i = 0 ;
+		for(i = 0; i < FACE_IMPORTANCE_LEVEL && dist > FACE_IMPORTANCE_TO_CAMERA_OVER_DISTANCE[i][0]; ++i);
+		i = llmin(i, FACE_IMPORTANCE_LEVEL - 1) ;
+		F32 dist_factor = FACE_IMPORTANCE_TO_CAMERA_OVER_DISTANCE[i][1] ;
+		
+		for(i = 0; i < FACE_IMPORTANCE_LEVEL && cos_angle_to_view_dir < FACE_IMPORTANCE_TO_CAMERA_OVER_ANGLE[i][0] ; ++i) ;
+		i = llmin(i, FACE_IMPORTANCE_LEVEL - 1) ;
+		importance = dist_factor * FACE_IMPORTANCE_TO_CAMERA_OVER_ANGLE[i][1] ;
+	}
+
+	return importance ;
+}
+
 BOOL LLFace::verify(const U32* indices_array) const
 {
 	BOOL ok = TRUE;