opengl.hpp

// Copyright 2009-2023 Jan Niklas Hasse <jhasse@bixense.com>
// For conditions of distribution and use, see copyright notice in LICENSE.txt

#pragma once

#include "jngl/Mat3.hpp"
#include "jngl/Mat4.hpp"

#ifdef IOS
	#include <OpenGLES/ES3/gl.h>
	#include <OpenGLES/ES3/glext.h>
#else
	#ifdef ANDROID
		#include <EGL/egl.h>
		#include <GLES3/gl3.h>
		#include <GLES3/gl3ext.h>
	#else
		#if defined (JNGL_UWP) || defined (__EMSCRIPTEN__)
			#define GL_GLEXT_PROTOTYPES 1
			#include <GLES2/gl2.h>
			#include <GLES2/gl2ext.h>

			#define glGenVertexArrays glGenVertexArraysOES
			#define glBindVertexArray glBindVertexArrayOES
			#define glDeleteVertexArrays glDeleteVertexArraysOES
			#if defined(__EMSCRIPTEN__)
				#define GL_RGBA8 GL_RGBA8_OES
			#endif
		#else
			#include <glad/gl.h>
		#endif
	#endif
#endif

#ifndef GL_BGR
#define GL_BGR 0x80e0
#endif

namespace opengl
{
	extern jngl::Mat3 modelview;
	extern jngl::Mat4 projection;

	/// A global VAO and VBO which are used with GL_STREAM_DRAW
	extern GLuint vaoStream;
	extern GLuint vboStream;

	void translate(float x, float y);
	void scale(float x, float y);

	/// Generates a textures, binds it to GL_TEXTURE_2D and sets some common parameters
	GLuint genAndBindTexture();
} // namespace opengl