151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/* 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.
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* In no event will the authors be held liable for any damages arising from
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* the use of this software.
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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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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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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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* Evan "cosmonaut" Hemsley <evan@moonside.games>
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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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#else
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#define SILKWORMAPI
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#define SILKWORMCALL
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef struct Silkworm_Vector2
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{
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float x;
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float y;
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} Silkworm_Vector2;
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typedef struct Silkworm_Node
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{
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uint64_t 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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float mass;
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float friction;
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float radius;
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float pinned;
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float pushFactor;
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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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uint64_t id;
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Silkworm_Node *a;
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Silkworm_Node *b;
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float distance;
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float tearThreshold;
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} Silkworm_Link;
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typedef enum Silkworm_ClothTriangleOrientation
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{
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UpperLeft,
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BottomRight
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} Silkworm_ClothTriangleOrientation;
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typedef struct Silkworm_Triangle
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{
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uint64_t id;
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Silkworm_Node* a;
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Silkworm_Node* b;
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Silkworm_Node* c;
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uint32_t aHorizontalIndex;
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uint32_t bHorizontalIndex;
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uint32_t cHorizontalIndex;
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uint32_t aVerticalIndex;
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uint32_t bVerticalIndex;
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uint32_t cVerticalIndex;
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Silkworm_ClothTriangleOrientation orientation;
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} Silkworm_Triangle;
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typedef struct Silkworm_Cloth
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{
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uint64_t id;
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float windFactor;
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uint32_t horizontalNodeCount;
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uint32_t verticalNodeCount;
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uint64_t **nodeIndices; /* x by y grid of indices */
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Silkworm_Triangle **triangles; /* array of pointers so we can use NULL */
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uint32_t triangleCount;
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} Silkworm_Cloth;
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typedef struct Silkworm_Rope
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{
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uint32_t nodeCount;
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uint32_t *nodeIndices;
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} Silkworm_Rope;
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/* Version API */
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#define SILKWORM_ABI_VERSION 0
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#define SILKWORM_MAJOR_VERSION 0
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#define SILKWORM_MINOR_VERSION 1
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#define SILKWORM_PATCH_VERSION 0
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#define SILKWORM_COMPILED_VERSION ( \
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(REFRESH_ABI_VERSION * 100 * 100 * 100) + \
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(REFRESH_MAJOR_VERSION * 100 * 100) + \
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(REFRESH_MINOR_VERSION * 100) + \
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(REFRESH_PATCH_VERSION) \
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)
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SILKWORMAPI void Silkworm_Init();
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SILKWORMAPI void Silkworm_Update(double delta);
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SILKWORMAPI double Silkworm_CreateNode(double xPosition, double yPosition, double mass, double friction, double radius, double pushFactor);
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SILKWORMAPI void Silkworm_NodeSetDestroyable(double nodeId);
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SILKWORMAPI void Silkworm_NodePin(double nodeId);
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SILKWORMAPI void Silkworm_NodeUnpin(double nodeId);
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SILKWORMAPI double Silkworm_CreateLink(double aId, double bId, double distance, double tearThreshold);
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SILKWORMAPI double Silkworm_CreateCloth(double xPosition, double yPosition, double horizontalNodeCount, double verticalNodeCount, double mass, double friction, double windFactor, double tearThreshold);
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SILKWORMAPI void Silkworm_SetTriangleBuffer(const char* bufferId);
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SILKWORMAPI double Silkworm_ClothFillTriangleBuffer(double clothId, double leftUV, double widthUV, double topUV, double heightUV);
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#endif /* SILKWORM_H */
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