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/* ----------------------------------------------------------------------------
* spritebatch.hpp
*
* Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
* See file LICENSE for more details
* ----------------------------------------------------------------------------
*/
#ifndef SPRITE_BATCH_HPP
#define SPRITE_BATCH_HPP
#include "vertex.hpp"
#include <GL/glew.h>
#include <glm/glm.hpp>
#include <vector>
namespace yage
{
class SpriteBatch;
class Glyph
{
// member variables
private:
GLuint texture_;
float depth_;
Vertex top_left_;
Vertex top_right_;
Vertex bottom_right_;
Vertex bottom_left_;
// member functions
public:
Glyph(GLuint texture, float depth, const Vertex &top_left, const Vertex &top_right, const Vertex &bottom_right, const Vertex &bottom_left);
inline GLuint texture() const { return texture_; }
inline float depth() const { return depth_; }
inline Vertex top_left() const { return top_left_; }
inline Vertex top_right() const { return top_right_; }
inline Vertex bottom_right() const { return bottom_right_; }
inline Vertex bottom_left() const { return bottom_left_; }
};
class RenderBatch
{
friend SpriteBatch;
// member variables
private:
GLsizei num_vertices_;
GLint offset_;
GLuint texture_;
// member functions
public:
RenderBatch(GLint offset, GLsizei num_vertices, GLuint texture);
// getters
inline GLint offset() const { return offset_; }
inline GLsizei num_vertices() const { return num_vertices_; }
inline GLuint texture() const { return texture_; }
};
class SpriteBatch
{
// member variables
public:
static const int NUM_VERTICES=6;
private:
GLuint vbo_=0;
GLuint vao_=0;
std::vector<Glyph> glyphs_;
std::vector<Glyph *> glyph_ptrs_;
std::vector<RenderBatch> render_batches_;
// member functions
public:
SpriteBatch();
~SpriteBatch();
// initialize vaos and vbos
void init();
void begin();
void end();
// adds a sprite to the sprite batch to be rendered later
void draw(const glm::vec4 &destination_rect, const glm::vec4 &uv_rect, GLuint texture, const Color &color, float depth);
// render the batch
void render();
private:
void createVertexArray();
void createRenderBatches();
void sortGlyphs();
};
} // yage
#endif
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