/*

    ......... 2015 Ivan Mahonin

    This program is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program.  If not, see <http: licenses="" www.gnu.org="">.</http:>

*/

#include <ctime></ctime>

#include <cassert></cassert>

#include <iostream></iostream>

#include <iomanip></iomanip>

#include <gl gl.h=""></gl>

#include <gl glext.h=""></gl>

#include <gl glx.h=""></gl>

#include "clcontext.h"

#include "test.h"

#include "shaders.h"

#define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091

#define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092

typedef GLXContext (*GLXCREATECONTEXTATTRIBSARBPROC)(Display*, GLXFBConfig, GLXContext, Bool, const int*);

using namespace std;

clock_t get_clock() {

	return clock();

}

int main() {

	// open display (we will use default display and screen 0)

	Display *display = XOpenDisplay(NULL);

	assert(display);

	// choose config

	int config_attribs[] = {

		GLX_DOUBLEBUFFER,      False,

		GLX_RED_SIZE,          8,

		GLX_GREEN_SIZE,        8,

		GLX_BLUE_SIZE,         8,

		GLX_ALPHA_SIZE,        8,

		GLX_DEPTH_SIZE,        24,

		GLX_STENCIL_SIZE,      8,

		GLX_ACCUM_RED_SIZE,    8,

		GLX_ACCUM_GREEN_SIZE,  8,

		GLX_ACCUM_BLUE_SIZE,   8,

		GLX_ACCUM_ALPHA_SIZE,  8,

		GLX_DRAWABLE_TYPE,     GLX_PBUFFER_BIT,

		None };

	int nelements = 0;

	GLXFBConfig *configs = glXChooseFBConfig(display, 0, config_attribs, &nelements);

	assert(configs != NULL && nelements > 0);

	GLXFBConfig config = configs[0];

	assert(config);

	// create pbuffer

	int pbuffer_width = 256;

	int pbuffer_height = 256;

	int pbuffer_attribs[] = {

		GLX_PBUFFER_WIDTH, pbuffer_width,

		GLX_PBUFFER_HEIGHT, pbuffer_height,

		None };

	GLXPbuffer pbuffer = glXCreatePbuffer(display, config, pbuffer_attribs);

	assert(pbuffer);

	// create context

	int context_attribs[] = {

		GLX_CONTEXT_MAJOR_VERSION_ARB, 3,

		GLX_CONTEXT_MINOR_VERSION_ARB, 3,

		None };

	GLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB = (GLXCREATECONTEXTATTRIBSARBPROC) glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");

	GLXContext context = glXCreateContextAttribsARB(display, config, NULL, True, context_attribs);

	assert(context);

	// make context current

	glXMakeContextCurrent(display, pbuffer, pbuffer, context);

	// frame buffer

	int framebuffer_width = 512;

	int framebuffer_height = 512;

	int framebuffer_samples = 16;

	bool antialising = false;

	bool hdr = false;

	GLenum internal_format = hdr ? GL_RGBA16F : GL_RGBA;

	GLenum color_type = hdr ? GL_FLOAT : GL_UNSIGNED_BYTE;

	GLuint multisample_texture_id = 0;

	glGenTextures(1, &multisample_texture_id);

	glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, multisample_texture_id);

	glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, framebuffer_samples, internal_format, framebuffer_width, framebuffer_height, GL_TRUE);

	GLuint multisample_renderbuffer_id = 0;

	glGenRenderbuffers(1, &multisample_renderbuffer_id);

	glBindRenderbuffer(GL_RENDERBUFFER, multisample_renderbuffer_id);

	glRenderbufferStorageMultisample(GL_RENDERBUFFER, framebuffer_samples, GL_STENCIL_INDEX8, framebuffer_width, framebuffer_height);

	GLuint multisample_framebuffer_id = 0;

	glGenFramebuffers(1, &multisample_framebuffer_id);

	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisample_framebuffer_id);

	glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, multisample_renderbuffer_id);

	glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, multisample_texture_id, 0);

	GLuint texture_id = 0;

	glGenTextures(1, &texture_id);

	glBindTexture(GL_TEXTURE_2D, texture_id);

	glTexImage2D(GL_TEXTURE_2D, 0, internal_format, framebuffer_width, framebuffer_height, 0, GL_RGBA, color_type, NULL);

	GLuint renderbuffer_id = 0;

	glGenRenderbuffers(1, &renderbuffer_id);

	glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer_id);

	glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, framebuffer_width, framebuffer_height);

	GLuint framebuffer_id = 0;

	glGenFramebuffers(1, &framebuffer_id);

	glBindFramebuffer(GL_READ_FRAMEBUFFER, framebuffer_id);

	glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, renderbuffer_id);

	glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_id, 0);

	cout << "Framebuffer status:" << setbase(16)

		 << " 0x" << glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER)

		 << " 0x" << glCheckFramebufferStatus(GL_READ_FRAMEBUFFER)

		 << setbase(10) << endl;

	// set view port

	glViewport(0, 0, framebuffer_width, framebuffer_height);

	if (antialising)

		glEnable(GL_MULTISAMPLE);

	else

		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, framebuffer_id);

	Shaders::initialize();

	// do something

	//Test::test1();

	//Test::test2();

	//Test::test3();

	//Test::test4();

	ClContext().hello();

	Shaders::deinitialize();

	// deinitialization

	glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);

	glDeleteFramebuffers(1, &framebuffer_id);

	glBindTexture(GL_TEXTURE_2D, 0);

	glDeleteTextures(1, &texture_id);

	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);

	glDeleteFramebuffers(1, &multisample_framebuffer_id);

	glBindRenderbuffer(GL_RENDERBUFFER, 0);

	glDeleteRenderbuffers(1, &multisample_renderbuffer_id);

	glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);

	glDeleteTextures(1, &multisample_texture_id);

	glXMakeContextCurrent(display, None, None, NULL);

	glXDestroyContext(display, context);

	glXDestroyPbuffer(display, pbuffer);

	XCloseDisplay(display);

	cout << "done" << endl;

	return 0;

}