/* Silkworm2 - Verlet cloth physics in C
 *
 * Copyright (c) 2022 Evan Hemsley
 *
 * 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>
 *
 */

#ifndef SILKWORM_H
#define SILKWORM_H

#include <math.h>
#include <stdbool.h>
#include <stdint.h>

#ifdef _WIN32
#define SILKWORMAPI __declspec(dllexport)
#define SILKWORMCALL __cdecl
#else
#define SILKWORMAPI
#define SILKWORMCALL
#endif

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/* Version API */

#define SILKWORM_ABI_VERSION	 0
#define SILKWORM_MAJOR_VERSION   0
#define SILKWORM_MINOR_VERSION	1
#define SILKWORM_PATCH_VERSION	0
#define SILKWORM_COMPILED_VERSION ( \
	(SILKWORM_ABI_VERSION * 100 * 100 * 100) + \
	(SILKWORM_MAJOR_VERSION * 100 * 100) + \
	(SILKWORM_MINOR_VERSION * 100) + \
	(SILKWORM_PATCH_VERSION) \
)

typedef struct Silkworm_NodeCreateInfo
{
	int32_t x;
	int32_t y;
	float mass;
	float friction;
	float radius;
	bool pinned;
	float pushFactor;
	float windFactor;
	bool destroyable;
} Silkworm_NodeCreateInfo;

typedef struct Silkworm_ClothCreateInfo
{
	int32_t x;
	int32_t y;
	int32_t horizontalNodeCount;
	int32_t verticalNodeCount;
	float mass;
	float friction;
	float windFactor;
	float tearThreshold;
} Silkworm_ClothCreateInfo;

typedef struct Silkworm_Vertex
{
	float x;
	float y;
	float z;
	float u;
	float v;
} Silkworm_Vertex;

SILKWORMAPI void Silkworm_Init();
SILKWORMAPI void Silkworm_Update(float delta, float windSpeedX, float windSpeedY);

SILKWORMAPI void* Silkworm_CreateNode(Silkworm_NodeCreateInfo* nodeCreateInfo);
SILKWORMAPI void Silkworm_DestroyNode(void* nodePtr);

SILKWORMAPI void* Silkworm_CreateLink(void* nodeAPtr, void* nodeBPtr, float distance, float tearThreshold);

SILKWORMAPI void* Silkworm_ClothCreate(Silkworm_ClothCreateInfo* clothCreateInfo);
SILKWORMAPI void Silkworm_ClothNodePin(void* clothPtr, uint32_t i, uint32_t j);
SILKWORMAPI void Silkworm_ClothNodeUnpin(void* clothPtr, uint32_t i, uint32_t j);
SILKWORMAPI void Silkworm_ClothNodeDestroy(void* clothPtr, uint32_t i, uint32_t j);
SILKWORMAPI int32_t Silkworm_ClothFillTriangleBuffer(void* clothPtr, void* vertexBufferPtr, float depth, float leftUV, float widthUV, float topUV, float heightUV);
SILKWORMAPI void Silkworm_ClothDestroy(void* clothPtr);

SILKWORMAPI void Silkworm_PinNodesInRadius(float x, float y, float radius);
SILKWORMAPI void Silkworm_UnpinNodesInRadius(float x, float y, float radius);
SILKWORMAPI void Silkworm_PushNodesInRadius(float x, float y, float radius, float xDirection, float yDirection);
SILKWORMAPI void Silkworm_DestroyNodesInRadius(float x, float y, float radius);
SILKWORMAPI void* Silkworm_FindClothInRadius(float x, float y, float radius);

SILKWORMAPI void Silkworm_PerformDestroys();
SILKWORMAPI void Silkworm_ClearAll();
SILKWORMAPI void Silkworm_Finish();

#endif /* SILKWORM_H */