initial commit
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||||||
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/* Silkworm - Verlet cloth physics in C
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*
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* Copyright (c) 2021 Evan Hemsley
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||||||
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*
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||||||
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* This software is provided 'as-is', without any express or implied warranty.
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||||||
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* In no event will the authors be held liable for any damages arising from
|
||||||
|
* the use of this software.
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||||||
|
*
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||||||
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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||||||
|
* freely, subject to the following restrictions:
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||||||
|
*
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||||||
|
* 1. The origin of this software must not be misrepresented; you must not
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||||||
|
* claim that you wrote the original software. If you use this software in a
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||||||
|
* product, an acknowledgment in the product documentation would be
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||||||
|
* appreciated but is not required.
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||||||
|
*
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||||||
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* 2. Altered source versions must be plainly marked as such, and must not be
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||||||
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* misrepresented as being the original software.
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||||||
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*
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||||||
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* 3. This notice may not be removed or altered from any source distribution.
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||||||
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*
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* Evan "cosmonaut" Hemsley <evan@moonside.games>
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*
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*/
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#include "Silkworm.h"
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#include <stdlib.h>
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typedef struct Silkworm_Context
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{
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Silkworm_Group **groups;
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uint32_t groupCount;
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} Silkworm_Context;
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static Silkworm_Context *context = NULL;
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#define CONSTRAINT_ITERATION_COUNT 3 /* TODO: make this a parameter? */
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void Silkworm_Init()
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{
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context = malloc(sizeof(Silkworm_Context));
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context->groups = NULL;
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context->groupCount = 0;
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}
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void Silkworm_Update()
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{
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int32_t i, j, iteration;
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Silkworm_Group *group;
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Silkworm_Link *link;
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for (iteration = 0; iteration < CONSTRAINT_ITERATION_COUNT; iteration += 1)
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{
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for (i = 0; i < context->groupCount; i += 1)
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{
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group = context->groups[i];
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for (j = 0; j < group->linkCount; j += 1)
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{
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link = group->links[j];
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double diffX = link->a->position.x - link->b->position.y;
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double diffY = link->a->position.y - link->b->position.y;
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double d = sqrt(diffX * diffX + diffY * diffY);
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double difference = (link->distance - d) / d;
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double translateX = diffX * 0.5 * difference;
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double translateY = diffY * 0.5 * difference;
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double distanceMoved = sqrt(translateX * translateX + translateY * translateY);
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}
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}
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}
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}
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double Silkworm_CreateGroup()
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{
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context->groups = realloc(context->groups, sizeof(Silkworm_Group*) * (context->groupCount + 1));
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Silkworm_Group* group = malloc(sizeof(Silkworm_Group));
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group->nodes = NULL;
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group->nodeCount = 0;
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group->links = NULL;
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group->linkCount = 0;
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context->groups[context->groupCount] = group;
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context->groupCount += 1;
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group->id.i = context->groupCount;
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return group->id.d;
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}
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static inline Silkworm_Group* LookupGroup(double groupId)
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{
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Silkworm_ID gId;
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gId.d = groupId;
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return context->groups[gId.i];
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}
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static inline Silkworm_Node* LookupNode(double groupId, double nodeId)
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{
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Silkworm_ID nId;
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nId.d = nodeId;
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return LookupGroup(groupId)->nodes[nId.i];
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}
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double Silkworm_CreateNode(double groupId, double xPosition, double yPosition, double mass, double friction, double radius, double pushFactor)
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{
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Silkworm_Group *group = LookupGroup(groupId);
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Silkworm_ID nodeId;
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nodeId.i = group->nodeCount;
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Silkworm_Node *node = malloc(sizeof(Silkworm_Node));
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node->id = nodeId;
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node->position.x = xPosition;
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node->position.y = yPosition;
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node->previousPosition.x = xPosition;
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node->previousPosition.y = yPosition;
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node->velocity.x = 0;
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node->velocity.y = 0;
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node->acceleration.x = 0;
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node->acceleration.y = 0;
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node->mass = mass;
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node->friction = friction;
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node->radius = radius;
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node->pushFactor = pushFactor;
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node->pinned = false;
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node->destroyable = false;
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group->nodes = realloc(group->nodes, sizeof(Silkworm_Node*) * (group->nodeCount + 1));
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group->nodes[group->nodeCount] = node;
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group->nodeCount += 1;
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return nodeId.d;
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}
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void Silkworm_NodeSetVelocity(double groupId, double nodeId, double xVelocity, double yVelocity)
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{
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LookupNode(groupId, nodeId)->velocity.x = xVelocity;
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LookupNode(groupId, nodeId)->velocity.y = yVelocity;
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}
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void Silkworm_NodeSetAcceleration(double groupId, double nodeId, double xAcceleration, double yAcceleration)
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{
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LookupNode(groupId, nodeId)->acceleration.x = xAcceleration;
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LookupNode(groupId, nodeId)->acceleration.y = yAcceleration;
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}
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void Silkworm_NodeSetDestroyable(double groupId, double nodeId)
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{
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LookupNode(groupId, nodeId)->destroyable = true;
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}
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void Silkworm_NodePin(double groupId, double nodeId)
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{
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LookupNode(groupId, nodeId)->pinned = true;
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}
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void Silkworm_NodeUnpin(double groupId, double nodeId)
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{
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LookupNode(groupId, nodeId)->pinned = false;
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}
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double Silkworm_CreateLink(double groupId, double aId, double bId, double distance, double tearThreshold)
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{
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Silkworm_Group *group = LookupGroup(groupId);
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Silkworm_Node *nodeA = LookupNode(groupId, aId);
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Silkworm_Node *nodeB = LookupNode(groupId, bId);
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Silkworm_ID linkId;
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linkId.i = group->linkCount;
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Silkworm_Link *link = malloc(sizeof(Silkworm_Link));
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link->id = linkId;
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link->a = nodeA;
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link->b = nodeB;
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link->distance = distance;
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link->tearThreshold = tearThreshold;
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group->links = realloc(group->links, sizeof(Silkworm_Link*) * (group->linkCount + 1));
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group->links[group->linkCount] = link;
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group->linkCount += 1;
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return linkId.d;
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}
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@ -0,0 +1,121 @@
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/* Silkworm - Verlet cloth physics in C
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||||||
|
*
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||||||
|
* Copyright (c) 2021 Evan Hemsley
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||||||
|
*
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||||||
|
* This software is provided 'as-is', without any express or implied warranty.
|
||||||
|
* In no event will the authors be held liable for any damages arising from
|
||||||
|
* the use of this software.
|
||||||
|
*
|
||||||
|
* Permission is granted to anyone to use this software for any purpose,
|
||||||
|
* including commercial applications, and to alter it and redistribute it
|
||||||
|
* freely, subject to the following restrictions:
|
||||||
|
*
|
||||||
|
* 1. The origin of this software must not be misrepresented; you must not
|
||||||
|
* claim that you wrote the original software. If you use this software in a
|
||||||
|
* product, an acknowledgment in the product documentation would be
|
||||||
|
* appreciated but is not required.
|
||||||
|
*
|
||||||
|
* 2. Altered source versions must be plainly marked as such, and must not be
|
||||||
|
* misrepresented as being the original software.
|
||||||
|
*
|
||||||
|
* 3. This notice may not be removed or altered from any source distribution.
|
||||||
|
*
|
||||||
|
* Evan "cosmonaut" Hemsley <evan@moonside.games>
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||||||
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*
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||||||
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*/
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||||||
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|
||||||
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#ifndef SILKWORM_H
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#define SILKWORM_H
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#include <math.h>
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#include <stdbool.h>
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#include <stdint.h>
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#ifdef _WIN32
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#define SILKWORMAPI __declspec(dllexport)
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#define SILKWORMCALL __cdecl
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||||||
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#else
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||||||
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#define SILKWORMAPI
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||||||
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#define SILKWORMCALL
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||||||
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#endif
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||||||
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||||||
|
#ifdef __cplusplus
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||||||
|
extern "C" {
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|
#endif /* __cplusplus */
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||||||
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||||||
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/* Game Maker only lets us use doubles in the API. So we do type punning to get integers. It's legal in C99! */
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||||||
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typedef union {
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int i;
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double d;
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} Silkworm_ID;
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||||||
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||||||
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typedef struct Silkworm_Vector2
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||||||
|
{
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double x;
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double y;
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||||||
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} Silkworm_Vector2;
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||||||
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||||||
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typedef struct Silkworm_Node
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||||||
|
{
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Silkworm_ID id;
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Silkworm_Vector2 position;
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Silkworm_Vector2 previousPosition;
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Silkworm_Vector2 velocity;
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|
Silkworm_Vector2 acceleration;
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||||||
|
double mass;
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||||||
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double friction;
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||||||
|
double radius;
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||||||
|
double pinned;
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||||||
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double pushFactor;
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||||||
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bool destroyable;
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||||||
|
} Silkworm_Node;
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||||||
|
|
||||||
|
typedef struct Silkworm_Link
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||||||
|
{
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||||||
|
Silkworm_ID id;
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||||||
|
Silkworm_Node *a;
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||||||
|
Silkworm_Node *b;
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||||||
|
double distance;
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||||||
|
double tearThreshold;
|
||||||
|
} Silkworm_Link;
|
||||||
|
|
||||||
|
typedef struct Silkworm_Group
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||||||
|
{
|
||||||
|
Silkworm_ID id;
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||||||
|
Silkworm_Node **nodes;
|
||||||
|
uint32_t nodeCount;
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||||||
|
|
||||||
|
Silkworm_Link **links;
|
||||||
|
uint32_t linkCount;
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||||||
|
} Silkworm_Group;
|
||||||
|
|
||||||
|
/* Version API */
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||||||
|
|
||||||
|
#define SILKWORM_ABI_VERSION 0
|
||||||
|
#define SILKWORM_MAJOR_VERSION 0
|
||||||
|
#define SILKWORM_MINOR_VERSION 1
|
||||||
|
#define SILKWORM_PATCH_VERSION 0
|
||||||
|
#define SILKWORM_COMPILED_VERSION ( \
|
||||||
|
(REFRESH_ABI_VERSION * 100 * 100 * 100) + \
|
||||||
|
(REFRESH_MAJOR_VERSION * 100 * 100) + \
|
||||||
|
(REFRESH_MINOR_VERSION * 100) + \
|
||||||
|
(REFRESH_PATCH_VERSION) \
|
||||||
|
)
|
||||||
|
|
||||||
|
SILKWORMAPI void Silkworm_Init();
|
||||||
|
SILKWORMAPI void Silkworm_Update();
|
||||||
|
|
||||||
|
SILKWORMAPI double Silkworm_CreateGroup();
|
||||||
|
|
||||||
|
SILKWORMAPI double Silkworm_CreateNode(double groupId, double xPosition, double yPosition, double mass, double friction, double radius, double pushFactor);
|
||||||
|
|
||||||
|
SILKWORMAPI void Silkworm_NodeSetVelocity(double groupId, double nodeId, double xVelocity, double yVelocity);
|
||||||
|
SILKWORMAPI void Silkworm_NodeSetAcceleration(double groupId, double nodeId, double xAcceleration, double yAcceleration);
|
||||||
|
|
||||||
|
SILKWORMAPI void Silkworm_NodeSetDestroyable(double groupId, double nodeId);
|
||||||
|
SILKWORMAPI void Silkworm_NodePin(double groupId, double nodeId);
|
||||||
|
SILKWORMAPI void Silkworm_NodeUnpin(double groupId, double nodeId);
|
||||||
|
|
||||||
|
SILKWORMAPI double Silkworm_CreateLink(double groupId, double aId, double bId, double distance, double tearThreshold);
|
||||||
|
|
||||||
|
#endif /* SILKWORM_H */
|
||||||
|
|
@ -0,0 +1,30 @@
|
||||||
|
Microsoft Visual Studio Solution File, Format Version 12.00
|
||||||
|
# Visual Studio 15
|
||||||
|
VisualStudioVersion = 15.0.28307.645
|
||||||
|
MinimumVisualStudioVersion = 10.0.40219.1
|
||||||
|
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Silkworm", "Silkworm.vcxproj", "{6DB15344-E000-45CB-A48A-1D72F7D6E945}"
|
||||||
|
EndProject
|
||||||
|
Global
|
||||||
|
GlobalSection(SolutionConfigurationPlatforms) = preSolution
|
||||||
|
Debug|x64 = Debug|x64
|
||||||
|
MinSizeRel|x64 = MinSizeRel|x64
|
||||||
|
Release|x64 = Release|x64
|
||||||
|
RelWithDebInfo|x64 = RelWithDebInfo|x64
|
||||||
|
EndGlobalSection
|
||||||
|
GlobalSection(ProjectConfigurationPlatforms) = postSolution
|
||||||
|
{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Debug|x64.ActiveCfg = Debug|x64
|
||||||
|
{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Debug|x64.Build.0 = Debug|x64
|
||||||
|
{6DB15344-E000-45CB-A48A-1D72F7D6E945}.MinSizeRel|x64.ActiveCfg = Release|x64
|
||||||
|
{6DB15344-E000-45CB-A48A-1D72F7D6E945}.MinSizeRel|x64.Build.0 = Release|x64
|
||||||
|
{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Release|x64.ActiveCfg = Release|x64
|
||||||
|
{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Release|x64.Build.0 = Release|x64
|
||||||
|
{6DB15344-E000-45CB-A48A-1D72F7D6E945}.RelWithDebInfo|x64.ActiveCfg = Release|x64
|
||||||
|
{6DB15344-E000-45CB-A48A-1D72F7D6E945}.RelWithDebInfo|x64.Build.0 = Release|x64
|
||||||
|
EndGlobalSection
|
||||||
|
GlobalSection(SolutionProperties) = preSolution
|
||||||
|
HideSolutionNode = FALSE
|
||||||
|
EndGlobalSection
|
||||||
|
GlobalSection(ExtensibilityGlobals) = postSolution
|
||||||
|
SolutionGuid = {7B2DB465-0A55-3811-9EF4-A520B47653D2}
|
||||||
|
EndGlobalSection
|
||||||
|
EndGlobal
|
||||||
|
|
@ -0,0 +1,87 @@
|
||||||
|
<?xml version="1.0" encoding="utf-8"?>
|
||||||
|
<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||||
|
<ItemGroup Label="ProjectConfigurations">
|
||||||
|
<ProjectConfiguration Include="Debug|Win32">
|
||||||
|
<Configuration>Debug</Configuration>
|
||||||
|
<Platform>Win32</Platform>
|
||||||
|
</ProjectConfiguration>
|
||||||
|
<ProjectConfiguration Include="Release|Win32">
|
||||||
|
<Configuration>Release</Configuration>
|
||||||
|
<Platform>Win32</Platform>
|
||||||
|
</ProjectConfiguration>
|
||||||
|
<ProjectConfiguration Include="Debug|x64">
|
||||||
|
<Configuration>Debug</Configuration>
|
||||||
|
<Platform>x64</Platform>
|
||||||
|
</ProjectConfiguration>
|
||||||
|
<ProjectConfiguration Include="Release|x64">
|
||||||
|
<Configuration>Release</Configuration>
|
||||||
|
<Platform>x64</Platform>
|
||||||
|
</ProjectConfiguration>
|
||||||
|
</ItemGroup>
|
||||||
|
<PropertyGroup Label="Globals">
|
||||||
|
<ProjectGuid>{6DB15344-E000-45CB-A48A-1D72F7D6E945}</ProjectGuid>
|
||||||
|
<RootNamespace>Silkworm</RootNamespace>
|
||||||
|
<WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
|
||||||
|
</PropertyGroup>
|
||||||
|
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
|
||||||
|
<PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
|
||||||
|
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||||
|
<UseDebugLibraries>true</UseDebugLibraries>
|
||||||
|
<CharacterSet>MultiByte</CharacterSet>
|
||||||
|
</PropertyGroup>
|
||||||
|
<PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">
|
||||||
|
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||||
|
<UseDebugLibraries>false</UseDebugLibraries>
|
||||||
|
<WholeProgramOptimization>true</WholeProgramOptimization>
|
||||||
|
<CharacterSet>MultiByte</CharacterSet>
|
||||||
|
</PropertyGroup>
|
||||||
|
<PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
|
||||||
|
<PlatformToolset>v141</PlatformToolset>
|
||||||
|
</PropertyGroup>
|
||||||
|
<PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
|
||||||
|
<PlatformToolset>v141</PlatformToolset>
|
||||||
|
</PropertyGroup>
|
||||||
|
<PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
|
||||||
|
<PlatformToolset>v141</PlatformToolset>
|
||||||
|
</PropertyGroup>
|
||||||
|
<PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
|
||||||
|
<PlatformToolset>v141</PlatformToolset>
|
||||||
|
</PropertyGroup>
|
||||||
|
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
|
||||||
|
<ImportGroup Label="ExtensionSettings">
|
||||||
|
</ImportGroup>
|
||||||
|
<ImportGroup Label="PropertySheets">
|
||||||
|
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||||
|
</ImportGroup>
|
||||||
|
<PropertyGroup Label="UserMacros" />
|
||||||
|
<ItemDefinitionGroup Condition="'$(Configuration)'=='Debug'">
|
||||||
|
<ClCompile>
|
||||||
|
<WarningLevel>Level3</WarningLevel>
|
||||||
|
<Optimization>Disabled</Optimization>
|
||||||
|
</ClCompile>
|
||||||
|
<Link>
|
||||||
|
<GenerateDebugInformation>DebugFull</GenerateDebugInformation>
|
||||||
|
</Link>
|
||||||
|
</ItemDefinitionGroup>
|
||||||
|
<ItemDefinitionGroup Condition="'$(Configuration)'=='Release'">
|
||||||
|
<ClCompile>
|
||||||
|
<WarningLevel>Level3</WarningLevel>
|
||||||
|
<Optimization>MaxSpeed</Optimization>
|
||||||
|
<FunctionLevelLinking>true</FunctionLevelLinking>
|
||||||
|
<IntrinsicFunctions>true</IntrinsicFunctions>
|
||||||
|
</ClCompile>
|
||||||
|
<Link>
|
||||||
|
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||||
|
<OptimizeReferences>true</OptimizeReferences>
|
||||||
|
</Link>
|
||||||
|
</ItemDefinitionGroup>
|
||||||
|
<ItemGroup>
|
||||||
|
<ClCompile Include="..\src\Silkworm.c" />
|
||||||
|
</ItemGroup>
|
||||||
|
<ItemGroup>
|
||||||
|
<ClInclude Include="..\src\Silkworm.h" />
|
||||||
|
</ItemGroup>
|
||||||
|
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
|
||||||
|
<ImportGroup Label="ExtensionTargets">
|
||||||
|
</ImportGroup>
|
||||||
|
</Project>
|
||||||
|
|
@ -0,0 +1,4 @@
|
||||||
|
<?xml version="1.0" encoding="utf-8"?>
|
||||||
|
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||||
|
<PropertyGroup />
|
||||||
|
</Project>
|
||||||
Loading…
Reference in New Issue