/******************************************************************************
 * Spine Runtimes Software License v2.5
 *
 * Copyright (c) 2013-2016, Esoteric Software
 * All rights reserved.
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 * You are granted a perpetual, non-exclusive, non-sublicensable, and
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 * adapt, or develop new applications using the Spine Runtimes or otherwise
 * create derivative works or improvements of the Spine Runtimes or (b) remove,
 * delete, alter, or obscure any trademarks or any copyright, trademark, patent,
 * or other intellectual property or proprietary rights notices on or in the
 * Software, including any copy thereof. Redistributions in binary or source
 * form must include this license and terms.
 *
 * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
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 * EVENT SHALL ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 *****************************************************************************/

#ifndef GLUtils_h
#define GLUtils_h

#include <stdint.h>

typedef struct spVertex {
	float x, y, z, w;
	uint32_t color;
	uint32_t color2;
	float u, v;
} spVertex;

typedef struct spMesh {
	spVertex* vertices;
	uint32_t numVertices;
	uint32_t numAllocatedVertices;
	unsigned short* indices;
	uint32_t numIndices;
	uint32_t numAllocatedIndices;
} spMesh;

typedef struct spMeshPart {
	spMesh* mesh;
	uint32_t startVertex;
	uint32_t numVertices;
	uint32_t startIndex;
	uint32_t numIndices;
	uint32_t textureHandle;
	uint32_t srcBlend;
	uint32_t dstBlend;
} spMeshPart;

spMesh* spMesh_create(uint32_t numVertices, uint32_t numIndices);
void spMesh_allocatePart(spMesh* mesh, spMeshPart* part, uint32_t numVertices, uint32_t numIndices, uint32_t textureHandle, uint32_t srcBlend, uint32_t dstBlend);
void spMesh_clearParts(spMesh* mesh);
void spMesh_dispose(spMesh* mesh);

typedef struct spShader {
	uint32_t program;
	uint32_t vertexShader;
	uint32_t fragmentShader;
} spShader;

spShader* spShader_create(const char* vertexShaderSource, const char* fragmentShaderSource);
void spShader_dispose(spShader* shader);

typedef struct spTwoColorBatcher {
	spShader* shader;
	
	uint32_t vertexBufferHandle;
	spVertex* verticesBuffer;
	uint32_t numVertices;
	
	uint32_t indexBufferHandle;
	unsigned short* indicesBuffer;
	uint32_t numIndices;
	
	int32_t positionAttributeLocation;
	int32_t colorAttributeLocation;
	int32_t color2AttributeLocation;
	int32_t texCoordsAttributeLocation;
	int32_t textureUniformLocation;
	
	uint32_t lastTextureHandle;
	uint32_t lastSrcBlend;
	uint32_t lastDstBlend;
} spTwoColorBatcher;

spTwoColorBatcher* spTwoColorBatcher_create();
void spTwoColorBatcher_add(spTwoColorBatcher* batcher, spMeshPart meshPart);
void spTwoColorBatcher_flush(spTwoColorBatcher* batcher);
void spDisposeTwoColorBatcher(spTwoColorBatcher* batcher);

#endif /* GLUtils_h */