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#ifndef __JE_OPENGL_H__
#define __JE_OPENGL_H__
#include <vector>
#include "../math/matrix.h"
#include "../math/transform.h"
//#include "GLee/GLee.h"
#include "glad/glad.h"
#include "color.h"
namespace JinEngine
{
namespace Graphics
{
// Wrap OpenGL API.
namespace Shaders { class Shader; };
namespace Fonts { class Font; };
class Texture;
class Canvas;
class OpenGL
{
public:
///
/// Blend mode.
/// https://www.andersriggelsen.dk/glblendfunc.php
///
enum class BlendMode
{
ALPHA = 1,
ADDITIVE = 2,
PREMULTIPLIEDALPHA = 3,
};
struct Stats
{
int drawCalls;
//int drawCallsBatched;
int canvasSwitches;
int shaderSwitches;
int fontSwitches;
int textures;
int canvases;
int fonts;
//int64 textureMemory;
};
static Canvas* const SCREEN;
OpenGL();
~OpenGL();
bool loadGL();
void init();
void enable(GLenum cap);
void disable(GLenum cap);
void setClearColor(GLubyte r, GLubyte g, GLubyte b, GLubyte a);
void pushColor(GLubyte r, GLubyte g, GLubyte b, GLubyte a = 255);
void popColor();
void flushError();
GLuint genTexture();
void deleteTexture(GLuint texture);
void bindTexture2D(GLuint texture = 0);
void setTexParameter(GLenum pname, GLint param);
void texImage(GLint internalformat, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels = NULL);
void texSubImage(GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels);
void activeTextureUnit(unsigned int unit = 0);
void drawArrays(GLenum mode, GLint first, GLsizei count);
void drawBuffer(GLenum mode);
void drawElements(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices);
void enableClientState(GLenum arr);
void disableClientState(GLenum arr);
GLuint genFrameBuffer();
void bindFrameBuffer(GLuint fbo);
void ortho(int w, float radio);
void orthox(int w, int h);
void setColor(Channel r, Channel g, Channel b, Channel a);
void setColor(Color c);
Color getColor();
void clearMatrix();
void pushMatrix();
void translate(float x, float y);
void scale(float sx, float sy);
void rotate(float r);
void popMatrix();
///
///
///
Math::Matrix getModelViewMatrix(const Math::Transform& tansform);
///
/// Get model view matrix.
///
Math::Matrix getModelViewMatrix(float x, float y, float sx, float sy, float r, float ox, float oy);
///
/// Get model view matrix.
///
Math::Matrix getModelViewMatrix();
///
/// Set orthogonal matrix.
///
void setProjectionMatrix(float l, float r, float b, float t, float n, float f);
///
/// Get orthogonal matrix.
///
const Math::Matrix& getProjectionMatrix();
///
///
///
void useShader(Shaders::Shader* shader);
///
///
///
void unuseShader();
///
///
///
Shaders::Shader* getShader();
///
///
///
void setFont(Fonts::Font* font);
///
///
///
void unsetFont();
///
///
///
Fonts::Font* getFont();
///
///
///
void bindCanvas(Canvas* canvas);
///
///
///
void unbindCanvas();
///
///
///
Canvas* getCanvas();
///
///
///
void setBlendMode(BlendMode mode);
///
///
///
BlendMode getBlendMode();
///
///
///
void resetStats();
///
///
///
Stats& getStats();
private:
///
///
///
std::vector<Math::Matrix> mModelViewMatrices;
///
///
///
Math::Matrix mModelViewMatrix;
///
///
///
Math::Matrix mProjectionMatrix;
///
///
///
BlendMode mBlendMode;
///
///
///
Color mColor;
///
///
///
Canvas* mCanvas;
///
///
///
Shaders::Shader* mShader;
///
///
///
Fonts::Font* mFont;
///
///
///
Stats mStats;
};
// Singleton.
extern OpenGL gl;
} // namespace Graphics
} // namespace JinEngine
#endif // __JE_OPENGL_H__
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