From c75d4e5a3c458f3a0cf7f5e0b19119b637d7fc9d Mon Sep 17 00:00:00 2001
From: Ray <raysan5@gmail.com>
Date: Sat, 9 Jan 2016 11:19:21 +0100
Subject: [PATCH] Created Use rlgl as standalone library (markdown)

---
 Use-rlgl-as-standalone-library.md | 94 +++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 Use-rlgl-as-standalone-library.md

diff --git a/Use-rlgl-as-standalone-library.md b/Use-rlgl-as-standalone-library.md
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+rlgl is a raylib module that let the user program in an OpenGL immediate mode style on any platform (internally uses OpenGL 1.1, 3.3 or ES 2.0). It can be used as standalone library.
+
+// TODO: Explain it a bit more
+
+```c
+#include <GLFW/glfw3.h>     // Manage window creation and context
+
+#define RLGL_STANDALONE
+#include "../src/rlgl.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+typedef struct {
+    float x;
+    float y;
+} Vector2;
+
+static void KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+    {
+        glfwSetWindowShouldClose(window, GL_TRUE);
+    }
+}
+
+static void DrawRectangleV(Vector2 position, Vector2 size, Color color);
+
+int main(void)
+{
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+    
+    GLFWwindow *window;
+    
+    glfwSetErrorCallback(ErrorCallback);
+    
+    if (!glfwInit()) exit(EXIT_FAILURE);
+   
+    window = glfwCreateWindow(screenWidth, screenHeight, "Testing rlgl standalone", NULL, NULL);
+    
+    if (!window)
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+    
+    glfwMakeContextCurrent(window);
+    glfwSwapInterval(1);
+    glfwSetKeyCallback(window, KeyCallback);
+    
+    rlglInit();
+    rlglInitGraphics(0, 0, screenWidth, screenHeight);
+    rlClearColor(245, 245, 245, 255); // Define clear color
+    
+    Vector2 size = { 400, 200 };
+    Vector2 position = { screenWidth/2 - size.x, screenHeight/2 - size.y};
+    Color color = { 255, 0, 0, 255 };        // RED
+    
+    while (!glfwWindowShouldClose(window))
+    {
+        rlClearScreenBuffers();
+        
+        DrawRectangleV(position, size, color);
+        
+        rlglDraw();
+        
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+    }
+    
+    rlglClose();
+    
+    glfwDestroyWindow(window);
+    glfwTerminate();
+    
+    return 0;
+}
+
+static void DrawRectangleV(Vector2 position, Vector2 size, Color color)
+{
+    rlBegin(RL_TRIANGLES);
+        rlColor4ub(color.r, color.g, color.b, color.a);
+
+        rlVertex2i(position.x, position.y);
+        rlVertex2i(position.x, position.y + size.y);
+        rlVertex2i(position.x + size.x, position.y + size.y);
+
+        rlVertex2i(position.x, position.y);
+        rlVertex2i(position.x + size.x, position.y + size.y);
+        rlVertex2i(position.x + size.x, position.y);
+    rlEnd();
+}
+```
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