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+/*******************************************************************************************
+*
+*   raylib [rlgl] example - Using rlgl module as standalone module
+*
+*   rlgl library is an abstraction layer for multiple OpenGL versions (1.1, 2.1, 3.3 Core, ES 2.0)
+*   that provides a pseudo-OpenGL 1.1 immediate-mode style API (rlVertex, rlTranslate, rlRotate...)
+*
+*   WARNING: This example is intended only for PLATFORM_DESKTOP and OpenGL 3.3 Core profile.
+*       It could work on other platforms if redesigned for those platforms (out-of-scope)
+*
+*   DEPENDENCIES:
+*       glfw3     - Windows and context initialization library
+*       rlgl.h    - OpenGL abstraction layer to OpenGL 1.1, 3.3 or ES2
+*       glad.h    - OpenGL extensions initialization library (required by rlgl)
+*       raymath.h - 3D math library
+*
+*   WINDOWS COMPILATION:
+*       gcc -o rlgl_standalone.exe rlgl_standalone.c -s -Iexternal\include -I..\..\src  \
+*           -L. -Lexternal\lib -lglfw3 -lopengl32 -lgdi32 -Wall -std=c99 -DGRAPHICS_API_OPENGL_33
+*
+*   APPLE COMPILATION:
+*       gcc -o rlgl_standalone rlgl_standalone.c -I../../src -Iexternal/include -Lexternal/lib \
+*           -lglfw3 -framework CoreVideo -framework OpenGL -framework IOKit -framework Cocoa
+*           -Wno-deprecated-declarations -std=c99 -DGRAPHICS_API_OPENGL_33
+*
+*
+*   LICENSE: zlib/libpng
+*
+*   This example is licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software:
+*
+*   Copyright (c) 2014-2024 Ramon Santamaria (@raysan5)
+*
+*   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.
+*
+********************************************************************************************/
+
+// NOTE: rlgl can be configured just re-defining the following values:
+//#define RL_DEFAULT_BATCH_BUFFER_ELEMENTS   8192    // Default internal render batch elements limits
+//#define RL_DEFAULT_BATCH_BUFFERS              1    // Default number of batch buffers (multi-buffering)
+//#define RL_DEFAULT_BATCH_DRAWCALLS          256    // Default number of batch draw calls (by state changes: mode, texture)
+//#define RL_DEFAULT_BATCH_MAX_TEXTURE_UNITS    4    // Maximum number of textures units that can be activated on batch drawing (SetShaderValueTexture())
+//#define RL_MAX_MATRIX_STACK_SIZE             32    // Maximum size of internal Matrix stack
+//#define RL_MAX_SHADER_LOCATIONS              32    // Maximum number of shader locations supported
+//#define RL_CULL_DISTANCE_NEAR              0.01    // Default projection matrix near cull distance
+//#define RL_CULL_DISTANCE_FAR             1000.0    // Default projection matrix far cull distance
+
+#define RLGL_IMPLEMENTATION
+#include "rlgl.h"               // OpenGL abstraction layer to OpenGL 1.1, 3.3+ or ES2
+
+#define RAYMATH_STATIC_INLINE
+#include "raymath.h"            // Vector2, Vector3, Quaternion and Matrix functionality
+
+#include "GLFW/glfw3.h"         // Windows/Context and inputs management
+
+#include <stdio.h>              // Required for: printf()
+
+#define RED        (Color){ 230, 41, 55, 255 }     // Red
+#define RAYWHITE   (Color){ 245, 245, 245, 255 }   // My own White (raylib logo)
+#define DARKGRAY   (Color){ 80, 80, 80, 255 }      // Dark Gray
+
+//----------------------------------------------------------------------------------
+// Structures Definition
+//----------------------------------------------------------------------------------
+// Color, 4 components, R8G8B8A8 (32bit)
+typedef struct Color {
+    unsigned char r;        // Color red value
+    unsigned char g;        // Color green value
+    unsigned char b;        // Color blue value
+    unsigned char a;        // Color alpha value
+} Color;
+
+// Camera type, defines a camera position/orientation in 3d space
+typedef struct Camera {
+    Vector3 position;       // Camera position
+    Vector3 target;         // Camera target it looks-at
+    Vector3 up;             // Camera up vector (rotation over its axis)
+    float fovy;             // Camera field-of-view apperture in Y (degrees) in perspective, used as near plane width in orthographic
+    int projection;         // Camera projection: CAMERA_PERSPECTIVE or CAMERA_ORTHOGRAPHIC
+} Camera;
+
+//----------------------------------------------------------------------------------
+// Module specific Functions Declaration
+//----------------------------------------------------------------------------------
+static void ErrorCallback(int error, const char *description);
+static void KeyCallback(GLFWwindow *window, int key, int scancode, int action, int mods);
+
+// Drawing functions (uses rlgl functionality)
+static void DrawGrid(int slices, float spacing);
+static void DrawCube(Vector3 position, float width, float height, float length, Color color);
+static void DrawCubeWires(Vector3 position, float width, float height, float length, Color color);
+static void DrawRectangleV(Vector2 position, Vector2 size, Color color);
+
+// NOTE: We use raymath to get this functionality but it could be implemented in this module
+//static Matrix MatrixIdentity(void);
+//static Matrix MatrixOrtho(double left, double right, double bottom, double top, double near, double far);
+//static Matrix MatrixPerspective(double fovy, double aspect, double near, double far);
+//static Matrix MatrixLookAt(Vector3 eye, Vector3 target, Vector3 up);
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    // GLFW3 Initialization + OpenGL 3.3 Context + Extensions
+    //--------------------------------------------------------
+    glfwSetErrorCallback(ErrorCallback);
+
+    if (!glfwInit())
+    {
+        printf("GLFW3: Can not initialize GLFW\n");
+        return 1;
+    }
+    else printf("GLFW3: GLFW initialized successfully\n");
+
+    glfwWindowHint(GLFW_SAMPLES, 4);
+    glfwWindowHint(GLFW_DEPTH_BITS, 16);
+    
+    // WARNING: OpenGL 3.3 Core profile only
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    //glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);
+#if defined(__APPLE__)
+    glfwWindowHint( GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE );
+#endif
+
+    GLFWwindow *window = glfwCreateWindow(screenWidth, screenHeight, "rlgl standalone", NULL, NULL);
+
+    if (!window)
+    {
+        glfwTerminate();
+        return 2;
+    }
+    else printf("GLFW3: Window created successfully\n");
+
+    glfwSetWindowPos(window, 200, 200);
+
+    glfwSetKeyCallback(window, KeyCallback);
+
+    glfwMakeContextCurrent(window);
+    glfwSwapInterval(0);
+
+    // Load OpenGL 3.3 supported extensions
+    rlLoadExtensions(glfwGetProcAddress);
+    //--------------------------------------------------------
+
+    // Initialize OpenGL context (states and resources)
+    rlglInit(screenWidth, screenHeight);
+
+    // Initialize viewport and internal projection/modelview matrices
+    rlViewport(0, 0, screenWidth, screenHeight);
+    rlMatrixMode(RL_PROJECTION);                        // Switch to PROJECTION matrix
+    rlLoadIdentity();                                   // Reset current matrix (PROJECTION)
+    rlOrtho(0, screenWidth, screenHeight, 0, 0.0f, 1.0f); // Orthographic projection with top-left corner at (0,0)
+    rlMatrixMode(RL_MODELVIEW);                         // Switch back to MODELVIEW matrix
+    rlLoadIdentity();                                   // Reset current matrix (MODELVIEW)
+
+    rlClearColor(245, 245, 245, 255);                   // Define clear color
+    rlEnableDepthTest();                                // Enable DEPTH_TEST for 3D
+
+    Camera camera = { 0 };
+    camera.position = (Vector3){ 5.0f, 5.0f, 5.0f };    // Camera position
+    camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };      // Camera looking at point
+    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };          // Camera up vector (rotation towards target)
+    camera.fovy = 45.0f;                                // Camera field-of-view Y
+
+    Vector3 cubePosition = { 0.0f, 0.0f, 0.0f };        // Cube default position (center)
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!glfwWindowShouldClose(window))
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        //camera.position.x += 0.01f;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        rlClearScreenBuffers();             // Clear current framebuffer
+
+            // Draw '3D' elements in the scene
+            //-----------------------------------------------
+            // Calculate projection matrix (from perspective) and view matrix from camera look at
+            Matrix matProj = MatrixPerspective((double)(camera.fovy*DEG2RAD), (double)screenWidth/(double)screenHeight, 0.01, 1000.0);
+            Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);
+
+            rlSetMatrixModelview(matView);    // Set internal modelview matrix (default shader)
+            rlSetMatrixProjection(matProj);   // Set internal projection matrix (default shader)
+
+            DrawCube(cubePosition, 2.0f, 2.0f, 2.0f, RED);
+            DrawCubeWires(cubePosition, 2.0f, 2.0f, 2.0f, RAYWHITE);
+            DrawGrid(10, 1.0f);
+
+            // Draw internal render batch buffers (3D data)
+            rlDrawRenderBatchActive();
+            //-----------------------------------------------
+
+            // Draw '2D' elements in the scene (GUI)
+            //-----------------------------------------------
+#define RLGL_SET_MATRIX_MANUALLY
+#if defined(RLGL_SET_MATRIX_MANUALLY)
+            matProj = MatrixOrtho(0.0, screenWidth, screenHeight, 0.0, 0.0, 1.0);
+            matView = MatrixIdentity();
+
+            rlSetMatrixModelview(matView);    // Set internal modelview matrix (default shader)
+            rlSetMatrixProjection(matProj);   // Set internal projection matrix (default shader)
+
+#else   // Let rlgl generate and multiply matrix internally
+
+            rlMatrixMode(RL_PROJECTION);                            // Enable internal projection matrix
+            rlLoadIdentity();                                       // Reset internal projection matrix
+            rlOrtho(0.0, screenWidth, screenHeight, 0.0, 0.0, 1.0); // Recalculate internal projection matrix
+            rlMatrixMode(RL_MODELVIEW);                             // Enable internal modelview matrix
+            rlLoadIdentity();                                       // Reset internal modelview matrix
+#endif
+            DrawRectangleV((Vector2){ 10.0f, 10.0f }, (Vector2){ 780.0f, 20.0f }, DARKGRAY);
+
+            // Draw internal render batch buffers (2D data)
+            rlDrawRenderBatchActive();
+            //-----------------------------------------------
+
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    rlglClose();                    // Unload rlgl internal buffers and default shader/texture
+
+    glfwDestroyWindow(window);      // Close window
+    glfwTerminate();                // Free GLFW3 resources
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
+
+//----------------------------------------------------------------------------------
+// Module specific Functions Definitions
+//----------------------------------------------------------------------------------
+
+// GLFW3: Error callback
+static void ErrorCallback(int error, const char *description)
+{
+    fprintf(stderr, "%s", description);
+}
+
+// GLFW3: Keyboard callback
+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);
+    }
+}
+
+// Draw rectangle using rlgl OpenGL 1.1 style coding (translated to OpenGL 3.3 internally)
+static void DrawRectangleV(Vector2 position, Vector2 size, Color color)
+{
+    rlBegin(RL_TRIANGLES);
+        rlColor4ub(color.r, color.g, color.b, color.a);
+
+        rlVertex2f(position.x, position.y);
+        rlVertex2f(position.x, position.y + size.y);
+        rlVertex2f(position.x + size.x, position.y + size.y);
+
+        rlVertex2f(position.x, position.y);
+        rlVertex2f(position.x + size.x, position.y + size.y);
+        rlVertex2f(position.x + size.x, position.y);
+    rlEnd();
+}
+
+// Draw a grid centered at (0, 0, 0)
+static void DrawGrid(int slices, float spacing)
+{
+    int halfSlices = slices / 2;
+
+    rlBegin(RL_LINES);
+        for (int i = -halfSlices; i <= halfSlices; i++)
+        {
+            if (i == 0)
+            {
+                rlColor3f(0.5f, 0.5f, 0.5f);
+                rlColor3f(0.5f, 0.5f, 0.5f);
+                rlColor3f(0.5f, 0.5f, 0.5f);
+                rlColor3f(0.5f, 0.5f, 0.5f);
+            }
+            else
+            {
+                rlColor3f(0.75f, 0.75f, 0.75f);
+                rlColor3f(0.75f, 0.75f, 0.75f);
+                rlColor3f(0.75f, 0.75f, 0.75f);
+                rlColor3f(0.75f, 0.75f, 0.75f);
+            }
+
+            rlVertex3f((float)i*spacing, 0.0f, (float)-halfSlices*spacing);
+            rlVertex3f((float)i*spacing, 0.0f, (float)halfSlices*spacing);
+
+            rlVertex3f((float)-halfSlices*spacing, 0.0f, (float)i*spacing);
+            rlVertex3f((float)halfSlices*spacing, 0.0f, (float)i*spacing);
+        }
+    rlEnd();
+}
+
+// Draw cube
+// NOTE: Cube position is the center position
+static void DrawCube(Vector3 position, float width, float height, float length, Color color)
+{
+    float x = 0.0f;
+    float y = 0.0f;
+    float z = 0.0f;
+
+    rlPushMatrix();
+
+        // NOTE: Be careful! Function order matters (rotate -> scale -> translate)
+        rlTranslatef(position.x, position.y, position.z);
+        //rlScalef(2.0f, 2.0f, 2.0f);
+        //rlRotatef(45, 0, 1, 0);
+
+        rlBegin(RL_TRIANGLES);
+            rlColor4ub(color.r, color.g, color.b, color.a);
+
+            // Front Face -----------------------------------------------------
+            rlVertex3f(x-width/2, y-height/2, z+length/2);  // Bottom Left
+            rlVertex3f(x+width/2, y-height/2, z+length/2);  // Bottom Right
+            rlVertex3f(x-width/2, y+height/2, z+length/2);  // Top Left
+
+            rlVertex3f(x+width/2, y+height/2, z+length/2);  // Top Right
+            rlVertex3f(x-width/2, y+height/2, z+length/2);  // Top Left
+            rlVertex3f(x+width/2, y-height/2, z+length/2);  // Bottom Right
+
+            // Back Face ------------------------------------------------------
+            rlVertex3f(x-width/2, y-height/2, z-length/2);  // Bottom Left
+            rlVertex3f(x-width/2, y+height/2, z-length/2);  // Top Left
+            rlVertex3f(x+width/2, y-height/2, z-length/2);  // Bottom Right
+
+            rlVertex3f(x+width/2, y+height/2, z-length/2);  // Top Right
+            rlVertex3f(x+width/2, y-height/2, z-length/2);  // Bottom Right
+            rlVertex3f(x-width/2, y+height/2, z-length/2);  // Top Left
+
+            // Top Face -------------------------------------------------------
+            rlVertex3f(x-width/2, y+height/2, z-length/2);  // Top Left
+            rlVertex3f(x-width/2, y+height/2, z+length/2);  // Bottom Left
+            rlVertex3f(x+width/2, y+height/2, z+length/2);  // Bottom Right
+
+            rlVertex3f(x+width/2, y+height/2, z-length/2);  // Top Right
+            rlVertex3f(x-width/2, y+height/2, z-length/2);  // Top Left
+            rlVertex3f(x+width/2, y+height/2, z+length/2);  // Bottom Right
+
+            // Bottom Face ----------------------------------------------------
+            rlVertex3f(x-width/2, y-height/2, z-length/2);  // Top Left
+            rlVertex3f(x+width/2, y-height/2, z+length/2);  // Bottom Right
+            rlVertex3f(x-width/2, y-height/2, z+length/2);  // Bottom Left
+
+            rlVertex3f(x+width/2, y-height/2, z-length/2);  // Top Right
+            rlVertex3f(x+width/2, y-height/2, z+length/2);  // Bottom Right
+            rlVertex3f(x-width/2, y-height/2, z-length/2);  // Top Left
+
+            // Right face -----------------------------------------------------
+            rlVertex3f(x+width/2, y-height/2, z-length/2);  // Bottom Right
+            rlVertex3f(x+width/2, y+height/2, z-length/2);  // Top Right
+            rlVertex3f(x+width/2, y+height/2, z+length/2);  // Top Left
+
+            rlVertex3f(x+width/2, y-height/2, z+length/2);  // Bottom Left
+            rlVertex3f(x+width/2, y-height/2, z-length/2);  // Bottom Right
+            rlVertex3f(x+width/2, y+height/2, z+length/2);  // Top Left
+
+            // Left Face ------------------------------------------------------
+            rlVertex3f(x-width/2, y-height/2, z-length/2);  // Bottom Right
+            rlVertex3f(x-width/2, y+height/2, z+length/2);  // Top Left
+            rlVertex3f(x-width/2, y+height/2, z-length/2);  // Top Right
+
+            rlVertex3f(x-width/2, y-height/2, z+length/2);  // Bottom Left
+            rlVertex3f(x-width/2, y+height/2, z+length/2);  // Top Left
+            rlVertex3f(x-width/2, y-height/2, z-length/2);  // Bottom Right
+        rlEnd();
+    rlPopMatrix();
+}
+
+// Draw cube wires
+static void DrawCubeWires(Vector3 position, float width, float height, float length, Color color)
+{
+    float x = 0.0f;
+    float y = 0.0f;
+    float z = 0.0f;
+
+    rlPushMatrix();
+
+        rlTranslatef(position.x, position.y, position.z);
+        //rlRotatef(45, 0, 1, 0);
+
+        rlBegin(RL_LINES);
+            rlColor4ub(color.r, color.g, color.b, color.a);
+
+            // Front Face -----------------------------------------------------
+            // Bottom Line
+            rlVertex3f(x-width/2, y-height/2, z+length/2);  // Bottom Left
+            rlVertex3f(x+width/2, y-height/2, z+length/2);  // Bottom Right
+
+            // Left Line
+            rlVertex3f(x+width/2, y-height/2, z+length/2);  // Bottom Right
+            rlVertex3f(x+width/2, y+height/2, z+length/2);  // Top Right
+
+            // Top Line
+            rlVertex3f(x+width/2, y+height/2, z+length/2);  // Top Right
+            rlVertex3f(x-width/2, y+height/2, z+length/2);  // Top Left
+
+            // Right Line
+            rlVertex3f(x-width/2, y+height/2, z+length/2);  // Top Left
+            rlVertex3f(x-width/2, y-height/2, z+length/2);  // Bottom Left
+
+            // Back Face ------------------------------------------------------
+            // Bottom Line
+            rlVertex3f(x-width/2, y-height/2, z-length/2);  // Bottom Left
+            rlVertex3f(x+width/2, y-height/2, z-length/2);  // Bottom Right
+
+            // Left Line
+            rlVertex3f(x+width/2, y-height/2, z-length/2);  // Bottom Right
+            rlVertex3f(x+width/2, y+height/2, z-length/2);  // Top Right
+
+            // Top Line
+            rlVertex3f(x+width/2, y+height/2, z-length/2);  // Top Right
+            rlVertex3f(x-width/2, y+height/2, z-length/2);  // Top Left
+
+            // Right Line
+            rlVertex3f(x-width/2, y+height/2, z-length/2);  // Top Left
+            rlVertex3f(x-width/2, y-height/2, z-length/2);  // Bottom Left
+
+            // Top Face -------------------------------------------------------
+            // Left Line
+            rlVertex3f(x-width/2, y+height/2, z+length/2);  // Top Left Front
+            rlVertex3f(x-width/2, y+height/2, z-length/2);  // Top Left Back
+
+            // Right Line
+            rlVertex3f(x+width/2, y+height/2, z+length/2);  // Top Right Front
+            rlVertex3f(x+width/2, y+height/2, z-length/2);  // Top Right Back
+
+            // Bottom Face  ---------------------------------------------------
+            // Left Line
+            rlVertex3f(x-width/2, y-height/2, z+length/2);  // Top Left Front
+            rlVertex3f(x-width/2, y-height/2, z-length/2);  // Top Left Back
+
+            // Right Line
+            rlVertex3f(x+width/2, y-height/2, z+length/2);  // Top Right Front
+            rlVertex3f(x+width/2, y-height/2, z-length/2);  // Top Right Back
+        rlEnd();
+    rlPopMatrix();
+}