klimi
/
Platformer


								//========================================================================

								// Context sharing test program

								// Copyright (c) Camilla Berglund <elmindreda@glfw.org>

								//

								// This software is provided 'as-is', without any express or implied

								// warranty. In no event will the authors be held liable for any damages

								// arising from the use of this software.

								//

								// Permission is granted to anyone to use this software for any purpose,

								// including commercial applications, and to alter it and redistribute it

								// freely, subject to the following restrictions:

								//

								// 1. The origin of this software must not be misrepresented; you must not

								//    claim that you wrote the original software. If you use this software

								//    in a product, an acknowledgment in the product documentation would

								//    be appreciated but is not required.

								//

								// 2. Altered source versions must be plainly marked as such, and must not

								//    be misrepresented as being the original software.

								//

								// 3. This notice may not be removed or altered from any source

								//    distribution.

								//

								//========================================================================

								//

								// This program is used to test sharing of objects between contexts

								//

								//========================================================================


								#include <glad/glad.h>

								#include <GLFW/glfw3.h>


								#include <stdio.h>

								#include <stdlib.h>


								#define WIDTH  400

								#define HEIGHT 400

								#define OFFSET 50


								static GLFWwindow* windows[2];


								static void error_callback(int error, const char* description)

								{

								    fprintf(stderr, "Error: %s\n", description);

								}


								static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)

								{

								    if (action == GLFW_PRESS && key == GLFW_KEY_ESCAPE)

								        glfwSetWindowShouldClose(window, GLFW_TRUE);

								}


								static GLFWwindow* open_window(const char* title, GLFWwindow* share, int posX, int posY)

								{

								    GLFWwindow* window;


								    glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);

								    window = glfwCreateWindow(WIDTH, HEIGHT, title, NULL, share);

								    if (!window)

								        return NULL;


								    glfwMakeContextCurrent(window);

								    gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);

								    glfwSwapInterval(1);

								    glfwSetWindowPos(window, posX, posY);

								    glfwShowWindow(window);


								    glfwSetKeyCallback(window, key_callback);


								    return window;

								}


								static GLuint create_texture(void)

								{

								    int x, y;

								    char pixels[256 * 256];

								    GLuint texture;


								    glGenTextures(1, &texture);

								    glBindTexture(GL_TEXTURE_2D, texture);


								    for (y = 0;  y < 256;  y++)

								    {

								        for (x = 0;  x < 256;  x++)

								            pixels[y * 256 + x] = rand() % 256;

								    }


								    glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 256, 256, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, pixels);

								    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

								    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);


								    return texture;

								}


								static void draw_quad(GLuint texture)

								{

								    int width, height;

								    glfwGetFramebufferSize(glfwGetCurrentContext(), &width, &height);


								    glViewport(0, 0, width, height);


								    glMatrixMode(GL_PROJECTION);

								    glLoadIdentity();

								    glOrtho(0.f, 1.f, 0.f, 1.f, 0.f, 1.f);


								    glEnable(GL_TEXTURE_2D);

								    glBindTexture(GL_TEXTURE_2D, texture);

								    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);


								    glBegin(GL_QUADS);


								    glTexCoord2f(0.f, 0.f);

								    glVertex2f(0.f, 0.f);


								    glTexCoord2f(1.f, 0.f);

								    glVertex2f(1.f, 0.f);


								    glTexCoord2f(1.f, 1.f);

								    glVertex2f(1.f, 1.f);


								    glTexCoord2f(0.f, 1.f);

								    glVertex2f(0.f, 1.f);


								    glEnd();

								}


								int main(int argc, char** argv)

								{

								    int x, y, width;

								    GLuint texture;


								    glfwSetErrorCallback(error_callback);


								    if (!glfwInit())

								        exit(EXIT_FAILURE);


								    windows[0] = open_window("First", NULL, OFFSET, OFFSET);

								    if (!windows[0])

								    {

								        glfwTerminate();

								        exit(EXIT_FAILURE);

								    }


								    // This is the one and only time we create a texture

								    // It is created inside the first context, created above

								    // It will then be shared with the second context, created below

								    texture = create_texture();


								    glfwGetWindowPos(windows[0], &x, &y);

								    glfwGetWindowSize(windows[0], &width, NULL);


								    // Put the second window to the right of the first one

								    windows[1] = open_window("Second", windows[0], x + width + OFFSET, y);

								    if (!windows[1])

								    {

								        glfwTerminate();

								        exit(EXIT_FAILURE);

								    }


								    // Set drawing color for both contexts

								    glfwMakeContextCurrent(windows[0]);

								    glColor3f(0.6f, 0.f, 0.6f);

								    glfwMakeContextCurrent(windows[1]);

								    glColor3f(0.6f, 0.6f, 0.f);


								    glfwMakeContextCurrent(windows[0]);


								    while (!glfwWindowShouldClose(windows[0]) &&

								           !glfwWindowShouldClose(windows[1]))

								    {

								        glfwMakeContextCurrent(windows[0]);

								        draw_quad(texture);


								        glfwMakeContextCurrent(windows[1]);

								        draw_quad(texture);


								        glfwSwapBuffers(windows[0]);

								        glfwSwapBuffers(windows[1]);


								        glfwWaitEvents();

								    }


								    glfwTerminate();

								    exit(EXIT_SUCCESS);

								}