Accelerate GPU raycaster with PLBVH.
This commit is contained in:
Jackson Lee
@@ -15,6 +15,7 @@ static const char* parallelLinearBvhCL= \
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"typedef float4 b3Vector3;\n"
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"#define b3Max max\n"
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"#define b3Min min\n"
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"#define b3Sqrt sqrt\n"
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"typedef struct\n"
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"{\n"
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" unsigned int m_key;\n"
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@@ -372,4 +373,151 @@ static const char* parallelLinearBvhCL= \
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" \n"
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" }\n"
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"}\n"
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"//From rayCastKernels.cl\n"
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"typedef struct\n"
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"{\n"
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" float4 m_from;\n"
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" float4 m_to;\n"
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"} b3RayInfo;\n"
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"typedef struct\n"
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"{\n"
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" float m_hitFraction;\n"
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" int m_hitResult0;\n"
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" int m_hitResult1;\n"
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" int m_hitResult2;\n"
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" float4 m_hitPoint;\n"
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" float4 m_hitNormal;\n"
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"} b3RayHit;\n"
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"//From rayCastKernels.cl\n"
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"b3Vector3 b3Vector3_normalize(b3Vector3 v)\n"
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"{\n"
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" b3Vector3 normal = (b3Vector3){v.x, v.y, v.z, 0.f};\n"
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" return normalize(normal); //OpenCL normalize == vector4 normalize\n"
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"}\n"
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"b3Scalar b3Vector3_length2(b3Vector3 v) { return v.x*v.x + v.y*v.y + v.z*v.z; }\n"
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"b3Scalar b3Vector3_dot(b3Vector3 a, b3Vector3 b) { return a.x*b.x + a.y*b.y + a.z*b.z; }\n"
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"/**\n"
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"int rayIntersectsAabb_optimized(b3Vector3 rayFrom, b3Vector3 rayTo, b3Vector3 rayNormalizedDirection, b3AabbCL aabb)\n"
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"{\n"
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" // not functional -- need to fix\n"
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" //aabb is considered as 3 pairs of 2 planes( {x_min, x_max}, {y_min, y_max}, {z_min, z_max} )\n"
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" //t_min is the first intersection, t_max is the second intersection\n"
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" b3Vector3 inverseRayDirection = (b3Vector3){1.0f, 1.0f, 1.0f, 0.0f} / rayNormalizedDirection;\n"
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" int4 sign = isless( inverseRayDirection, (b3Vector3){0.0f, 0.0f, 0.0f, 0.0f} ); //isless(x,y) returns (x < y)\n"
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" \n"
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" //select(b, a, condition) == condition ? a : b\n"
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" b3Vector3 t_min = ( select(aabb.m_min, aabb.m_max, sign) - rayFrom ) * inverseRayDirection;\n"
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" b3Vector3 t_max = ( select(aabb.m_min, aabb.m_max, (int4){1,1,1,1} - sign) - rayFrom ) * inverseRayDirection;\n"
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" b3Scalar t_min_final = 0.0f;\n"
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" b3Scalar t_max_final = b3Sqrt( b3Vector3_length2(rayTo - rayFrom) );\n"
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" \n"
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" //Must use fmin()/fmax(); if one of the parameters is NaN, then the parameter that is not NaN is returned. \n"
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" //Behavior of min()/max() with NaNs is undefined. (See OpenCL Specification 1.2 [6.12.2] and [6.12.4])\n"
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" //Since the innermost fmin()/fmax() is always not NaN, this should never return NaN\n"
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" t_min_final = fmax( t_min.z, fmax(t_min.y, fmax(t_min.x, t_min_final)) );\n"
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" t_max_final = fmin( t_max.z, fmin(t_max.y, fmin(t_max.x, t_max_final)) );\n"
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" \n"
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" return (t_min_final <= t_max_final);\n"
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"}\n"
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"**/\n"
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"void rayPlanePairTest(b3Scalar rayStart, b3Scalar rayNormalizedDirection,\n"
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" b3Scalar planeMin, b3Scalar planeMax, \n"
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" b3Scalar* out_t_min, b3Scalar* out_t_max)\n"
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"{\n"
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" if(rayNormalizedDirection < 0.0f)\n"
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" {\n"
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" //max is closer, min is farther\n"
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" *out_t_min = (planeMax - rayStart) / rayNormalizedDirection;\n"
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" *out_t_max = (planeMin - rayStart) / rayNormalizedDirection;\n"
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" }\n"
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" else\n"
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" {\n"
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" //min is closer, max is farther\n"
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" *out_t_min = (planeMin - rayStart) / rayNormalizedDirection;\n"
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" *out_t_max = (planeMax - rayStart) / rayNormalizedDirection;\n"
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" }\n"
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"}\n"
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"int rayIntersectsAabb(b3Vector3 rayFrom, b3Vector3 rayTo, b3Vector3 rayNormalizedDirection, b3AabbCL aabb)\n"
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"{\n"
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" b3Scalar t_min_x, t_min_y, t_min_z;\n"
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" b3Scalar t_max_x, t_max_y, t_max_z;\n"
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" \n"
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" rayPlanePairTest(rayFrom.x, rayNormalizedDirection.x, aabb.m_min.x, aabb.m_max.x, &t_min_x, &t_max_x);\n"
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" rayPlanePairTest(rayFrom.y, rayNormalizedDirection.y, aabb.m_min.y, aabb.m_max.y, &t_min_y, &t_max_y);\n"
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" rayPlanePairTest(rayFrom.z, rayNormalizedDirection.z, aabb.m_min.z, aabb.m_max.z, &t_min_z, &t_max_z);\n"
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" \n"
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" b3Scalar t_min_final = 0.0f;\n"
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" b3Scalar t_max_final = b3Sqrt( b3Vector3_length2(rayTo - rayFrom) );\n"
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" \n"
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" t_min_final = fmax( t_min_z, fmax(t_min_y, fmax(t_min_x, t_min_final)) );\n"
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" t_max_final = fmin( t_max_z, fmin(t_max_y, fmin(t_max_x, t_max_final)) );\n"
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" \n"
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" return (t_min_final <= t_max_final);\n"
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"}\n"
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"__kernel void plbvhRayTraverse(__global b3AabbCL* rigidAabbs,\n"
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" __global int2* internalNodeChildIndices, \n"
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" __global b3AabbCL* internalNodeAabbs,\n"
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" __global int2* internalNodeLeafIndexRanges,\n"
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" __global SortDataCL* mortonCodesAndAabbIndices,\n"
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" \n"
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" __global b3RayInfo* rays,\n"
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" \n"
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" __global int* out_numRayRigidPairs, \n"
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" __global int2* out_rayRigidPairs,\n"
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" int maxRayRigidPairs, int numRays)\n"
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"{\n"
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" int rayIndex = get_global_id(0);\n"
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" if(rayIndex >= numRays) return;\n"
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" \n"
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" b3Vector3 rayFrom = rays[rayIndex].m_from;\n"
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" b3Vector3 rayTo = rays[rayIndex].m_to;\n"
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" b3Vector3 rayNormalizedDirection = b3Vector3_normalize(rays[rayIndex].m_to - rays[rayIndex].m_from);\n"
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" \n"
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" int stack[B3_PLVBH_TRAVERSE_MAX_STACK_SIZE];\n"
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" \n"
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" //Starting by placing only the root node index, 0, in the stack causes it to be detected as a leaf node(see isLeafNode() in loop)\n"
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" int stackSize = 2;\n"
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" stack[0] = internalNodeChildIndices[B3_PLBVH_ROOT_NODE_INDEX].x;\n"
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" stack[1] = internalNodeChildIndices[B3_PLBVH_ROOT_NODE_INDEX].y;\n"
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" \n"
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" while(stackSize)\n"
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" {\n"
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" int internalOrLeafNodeIndex = stack[ stackSize - 1 ];\n"
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" --stackSize;\n"
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" \n"
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" int isLeaf = isLeafNode(internalOrLeafNodeIndex); //Internal node if false\n"
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" int bvhNodeIndex = getIndexWithInternalNodeMarkerRemoved(internalOrLeafNodeIndex);\n"
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" \n"
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" //bvhRigidIndex is not used if internal node\n"
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" int bvhRigidIndex = (isLeaf) ? mortonCodesAndAabbIndices[bvhNodeIndex].m_value : -1;\n"
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" \n"
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" b3AabbCL bvhNodeAabb = (isLeaf) ? rigidAabbs[bvhRigidIndex] : internalNodeAabbs[bvhNodeIndex];\n"
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" \n"
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" if( rayIntersectsAabb(rayFrom, rayTo, rayNormalizedDirection, bvhNodeAabb) )\n"
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" {\n"
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" if(isLeaf)\n"
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" {\n"
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" int2 rayRigidPair;\n"
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" rayRigidPair.x = rayIndex;\n"
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" rayRigidPair.y = rigidAabbs[bvhRigidIndex].m_minIndices[3];\n"
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" \n"
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" int pairIndex = atomic_inc(out_numRayRigidPairs);\n"
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" if(pairIndex < maxRayRigidPairs) out_rayRigidPairs[pairIndex] = rayRigidPair;\n"
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" }\n"
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" \n"
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" if(!isLeaf) //Internal node\n"
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" {\n"
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" if(stackSize + 2 > B3_PLVBH_TRAVERSE_MAX_STACK_SIZE)\n"
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" {\n"
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" //Error\n"
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" }\n"
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" else\n"
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" {\n"
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" stack[ stackSize++ ] = internalNodeChildIndices[bvhNodeIndex].x;\n"
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" stack[ stackSize++ ] = internalNodeChildIndices[bvhNodeIndex].y;\n"
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" }\n"
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" }\n"
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" }\n"
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" }\n"
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"}\n"
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;
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