From 5d2c6f0a266d1ba8761240a044d35079dcadf736 Mon Sep 17 00:00:00 2001
From: jvech <jmvalenciae@unal.edu.co>
Date: Wed, 10 Aug 2022 22:17:34 -0500
Subject: Hello Window Done

---
 src/main.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 84 insertions(+), 2 deletions(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index b661dce..948932e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,8 +1,90 @@
 #include <stdio.h>
-#include "linear.h"
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+#include "main.h"
+
+static void sysError(const char *msg);
+static void userError(const char *msg, const char *detail);
+static void glfw_size_callback(GLFWwindow *window, int width, int height);
+static void processInput(GLFWwindow *window, struct Background *c);
+
+void
+sysError(const char *msg)
+{
+    perror(msg);
+    exit(1);
+}
+
+void 
+userError(const char *msg, const char *detail)
+{
+    fprintf(stderr, "%s : %s\n", msg, detail);
+    exit(1);
+}
+
+static void
+glfw_size_callback(GLFWwindow *window, int width, int height)
+{
+    glViewport(0, 0, width, height);
+}
+
+static void 
+processInput(GLFWwindow *window, struct Background *c)
+{
+    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS
+        || glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS) {
+        glfwSetWindowShouldClose(window, 1);
+    } else if (glfwGetKey(window, GLFW_KEY_R) == GLFW_PRESS
+               && glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS
+               && c->R >= 0.0) {
+        c->R -= 0.1;
+    } else if (glfwGetKey(window, GLFW_KEY_R) == GLFW_PRESS && c->R <= 1.0) {
+        c->R += 0.1;
+    } 
+}
 
 int main()
 {
-    printf("Opengl Here we go\n");
+    GLFWwindow *window;
+    const char *glfwErrno;
+
+    if (!glfwInit()) {
+        glfwGetError(&glfwErrno);
+        glfwTerminate();
+        userError("glfwInit() Error", glfwErrno);
+    }
+
+    window = glfwCreateWindow(640, 480, "Mverse", NULL, NULL);
+    if (!window) {
+        glfwTerminate();
+        userError("glfwCreateWindow() failed", "Can't create window");
+    }
+
+    glfwSetFramebufferSizeCallback(window, glfw_size_callback);
+    glfwMakeContextCurrent(window);
+
+    GLubyte glewErrno = glewInit();
+    if (glewErrno != GLEW_OK) {
+        glfwTerminate();
+        userError("glewInit() failed", (const char *)glewGetErrorString(glewErrno));
+    }
+
+    struct Background colors = {.R = 0.0, .G = 0.0, .B = 0.0, .A = 0.0};
+
+    while (!glfwWindowShouldClose(window)) {
+        glClear(GL_COLOR_BUFFER_BIT);
+        glClearColor(colors.R, colors.G, colors.B, colors.A);
+
+        processInput(window, &colors);
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+    }
+
+    glfwTerminate();
     return 0;
 }
-- 
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