batch.h

/*
 * The MIT License
 *
 * Copyright 2016 twisterge.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/* 
 * File:   SpriteBatch.h
 * Author: twisterge
 *
 * Created on November 30, 2016, 10:39 AM
 */

#ifndef SPRITEBATCH_H
#define SPRITEBATCH_H

#include "vmath.h"
#include "Texture.h"
#include "Shader.h"

#include <vector>

typedef struct {
	Vector3f position;
	Vector2f uv;
	Vector4f color;
} Vertex;

typedef struct {
	Vertex v1, v2, v3, v4;
	Texture* diffuse = nullptr;
	Texture* normal = nullptr;
	Texture* depth = nullptr;
} Sprite;

typedef struct {
	Texture* diffuse = nullptr;
	Texture* normal = nullptr;
	Texture* depth = nullptr;
	uint offset, vertex_count;
} RenderBatch;

#define SB_SPRITE_SIZE sizeof(Vertex) * 6
#define SB_MAX_SPRITES 20000
#define SB_BUFFER_SIZE SB_MAX_SPRITES * SB_SPRITE_SIZE

#define OGL_OFFSET(t, x) ((void*)offsetof(t, x))

class SpriteBatch {
public:
	SpriteBatch(int width, int height);
	~SpriteBatch();
	
	void Draw(Vector2f position, Texture* diffuse);
	
	void Begin();
	void End();
	void Render();
private:
	GLuint m_vbo, m_vao;
	std::vector<Sprite*> m_sprites;
	std::vector<RenderBatch*> m_batches;
	bool m_drawing;
	
	Shader* m_default;
	Matrix4f model, projection;
};

#endif /* SPRITEBATCH_H */