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Fix PLBVH with 0/1 nodes, fix optimized ray-AABB intersect.

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This commit is contained in:
Jackson Lee
2014-02-26 14:56:43 -08:00
parent c782f4976c
commit fe12ad9c9b
3 changed files with 69 additions and 178 deletions
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74
src/Bullet3OpenCL/BroadphaseCollision/kernels/parallelLinearBvhKernels.h
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@@ -383,64 +383,38 @@ static const char* parallelLinearBvhCL= \
"}\n"
"b3Scalar b3Vector3_length2(b3Vector3 v) { return v.x*v.x + v.y*v.y + v.z*v.z; }\n"
"b3Scalar b3Vector3_dot(b3Vector3 a, b3Vector3 b) { return a.x*b.x + a.y*b.y + a.z*b.z; }\n"
"/**\n"
"int rayIntersectsAabb_optimized(b3Vector3 rayFrom, b3Vector3 rayTo, b3Vector3 rayNormalizedDirection, b3AabbCL aabb)\n"
"int rayIntersectsAabb(b3Vector3 rayOrigin, b3Scalar rayLength, b3Vector3 rayNormalizedDirection, b3AabbCL aabb)\n"
"{\n"
" // not functional -- need to fix\n"
" //aabb is considered as 3 pairs of 2 planes( {x_min, x_max}, {y_min, y_max}, {z_min, z_max} )\n"
" //t_min is the first intersection, t_max is the second intersection\n"
" b3Vector3 inverseRayDirection = (b3Vector3){1.0f, 1.0f, 1.0f, 0.0f} / rayNormalizedDirection;\n"
" int4 sign = isless( inverseRayDirection, (b3Vector3){0.0f, 0.0f, 0.0f, 0.0f} ); //isless(x,y) returns (x < y)\n"
" //AABB is considered as 3 pairs of 2 planes( {x_min, x_max}, {y_min, y_max}, {z_min, z_max} ).\n"
" //t_min is the point of intersection with the closer plane, t_max is the point of intersection with the farther plane.\n"
" //\n"
" //if (rayNormalizedDirection.x < 0.0f), then max.x will be the near plane \n"
" //and min.x will be the far plane; otherwise, it is reversed.\n"
" //\n"
" //In order for there to be a collision, the t_min and t_max of each pair must overlap.\n"
" //This can be tested for by selecting the highest t_min and lowest t_max and comparing them.\n"
" \n"
" int4 isNegative = isless( rayNormalizedDirection, (b3Vector3){0.0f, 0.0f, 0.0f, 0.0f} ); //isless(x,y) returns (x < y)\n"
" \n"
" //When using vector types, the select() function checks the most signficant bit, \n"
" //but isless() sets the least significant bit.\n"
" isNegative <<= 31;\n"
" //select(b, a, condition) == condition ? a : b\n"
" b3Vector3 t_min = ( select(aabb.m_min, aabb.m_max, sign) - rayFrom ) * inverseRayDirection;\n"
" b3Vector3 t_max = ( select(aabb.m_min, aabb.m_max, (int4){1,1,1,1} - sign) - rayFrom ) * inverseRayDirection;\n"
" //When using select() with vector types, (condition[i]) is true if its most significant bit is 1\n"
" b3Vector3 t_min = ( select(aabb.m_min, aabb.m_max, isNegative) - rayOrigin ) / rayNormalizedDirection;\n"
" b3Vector3 t_max = ( select(aabb.m_max, aabb.m_min, isNegative) - rayOrigin ) / rayNormalizedDirection;\n"
" \n"
" b3Scalar t_min_final = 0.0f;\n"
" b3Scalar t_max_final = b3Sqrt( b3Vector3_length2(rayTo - rayFrom) );\n"
" b3Scalar t_max_final = rayLength;\n"
" \n"
" //Must use fmin()/fmax(); if one of the parameters is NaN, then the parameter that is not NaN is returned. \n"
" //Behavior of min()/max() with NaNs is undefined. (See OpenCL Specification 1.2 [6.12.2] and [6.12.4])\n"
" //Since the innermost fmin()/fmax() is always not NaN, this should never return NaN\n"
" //Since the innermost fmin()/fmax() is always not NaN, this should never return NaN.\n"
" t_min_final = fmax( t_min.z, fmax(t_min.y, fmax(t_min.x, t_min_final)) );\n"
" t_max_final = fmin( t_max.z, fmin(t_max.y, fmin(t_max.x, t_max_final)) );\n"
" \n"
" return (t_min_final <= t_max_final);\n"
"}\n"
"**/\n"
"void rayPlanePairTest(b3Scalar rayStart, b3Scalar rayNormalizedDirection,\n"
" b3Scalar planeMin, b3Scalar planeMax, \n"
" b3Scalar* out_t_min, b3Scalar* out_t_max)\n"
"{\n"
" if(rayNormalizedDirection < 0.0f)\n"
" {\n"
" //max is closer, min is farther\n"
" *out_t_min = (planeMax - rayStart) / rayNormalizedDirection;\n"
" *out_t_max = (planeMin - rayStart) / rayNormalizedDirection;\n"
" }\n"
" else\n"
" {\n"
" //min is closer, max is farther\n"
" *out_t_min = (planeMin - rayStart) / rayNormalizedDirection;\n"
" *out_t_max = (planeMax - rayStart) / rayNormalizedDirection;\n"
" }\n"
"}\n"
"int rayIntersectsAabb(b3Vector3 rayFrom, b3Vector3 rayTo, b3Vector3 rayNormalizedDirection, b3AabbCL aabb)\n"
"{\n"
" b3Scalar t_min_x, t_min_y, t_min_z;\n"
" b3Scalar t_max_x, t_max_y, t_max_z;\n"
" \n"
" rayPlanePairTest(rayFrom.x, rayNormalizedDirection.x, aabb.m_min.x, aabb.m_max.x, &t_min_x, &t_max_x);\n"
" rayPlanePairTest(rayFrom.y, rayNormalizedDirection.y, aabb.m_min.y, aabb.m_max.y, &t_min_y, &t_max_y);\n"
" rayPlanePairTest(rayFrom.z, rayNormalizedDirection.z, aabb.m_min.z, aabb.m_max.z, &t_min_z, &t_max_z);\n"
" \n"
" b3Scalar t_min_final = 0.0f;\n"
" b3Scalar t_max_final = b3Sqrt( b3Vector3_length2(rayTo - rayFrom) );\n"
" \n"
" t_min_final = fmax( t_min_z, fmax(t_min_y, fmax(t_min_x, t_min_final)) );\n"
" t_max_final = fmin( t_max_z, fmin(t_max_y, fmin(t_max_x, t_max_final)) );\n"
" \n"
" return (t_min_final <= t_max_final);\n"
"}\n"
"__kernel void plbvhRayTraverse(__global b3AabbCL* rigidAabbs,\n"
" __global int* rootNodeIndex, \n"
" __global int2* internalNodeChildIndices, \n"
@@ -457,10 +431,12 @@ static const char* parallelLinearBvhCL= \
" int rayIndex = get_global_id(0);\n"
" if(rayIndex >= numRays) return;\n"
" \n"
" //\n"
" b3Vector3 rayFrom = rays[rayIndex].m_from;\n"
" b3Vector3 rayTo = rays[rayIndex].m_to;\n"
" b3Vector3 rayNormalizedDirection = b3Vector3_normalize(rays[rayIndex].m_to - rays[rayIndex].m_from);\n"
" \n"
" b3Vector3 rayNormalizedDirection = b3Vector3_normalize(rayTo - rayFrom);\n"
" b3Scalar rayLength = b3Sqrt( b3Vector3_length2(rayTo - rayFrom) );\n"
" //\n"
" int stack[B3_PLVBH_TRAVERSE_MAX_STACK_SIZE];\n"
" \n"
" int stackSize = 1;\n"
@@ -478,7 +454,7 @@ static const char* parallelLinearBvhCL= \
" int bvhRigidIndex = (isLeaf) ? mortonCodesAndAabbIndices[bvhNodeIndex].m_value : -1;\n"
" \n"
" b3AabbCL bvhNodeAabb = (isLeaf) ? rigidAabbs[bvhRigidIndex] : internalNodeAabbs[bvhNodeIndex];\n"
" if( rayIntersectsAabb(rayFrom, rayTo, rayNormalizedDirection, bvhNodeAabb) )\n"
" if( rayIntersectsAabb(rayFrom, rayLength, rayNormalizedDirection, bvhNodeAabb) )\n"
" {\n"
" if(isLeaf)\n"
" {\n"