Add nehe lessons

Author: fjtrujy

examples/CMakeLists.txt

@@ -172,6 +172,7 @@ add_custom_command(TARGET tricked_out POST_BUILD
 )
 
 # NeHe tutorials
+add_ps2gl_example(nehe_lesson01 nehe/lesson01/lesson1.cpp)
 add_ps2gl_example(nehe_lesson02 nehe/lesson02/lesson2.cpp)
 add_ps2gl_example(nehe_lesson03 nehe/lesson03/lesson3.cpp)
 add_ps2gl_example(nehe_lesson04 nehe/lesson04/lesson4.cpp)

examples/nehe/lesson01/lesson1.cpp

@@ -0,0 +1,91 @@
+#include <GL/gl.h>
+#include <GL/glut.h>
+#include <math.h>
+
+// Simple replacement for gluPerspective (GLU not available on PS2)
+void gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar)
+{
+    GLdouble xmin, xmax, ymin, ymax;
+
+    ymax = zNear * tan(fovy * M_PI / 360.0f);
+    ymin = -ymax;
+    xmin = ymin * aspect;
+    xmax = ymax * aspect;
+
+    glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
+}
+
+// Global Variables
+bool g_gamemode = false;
+bool g_fullscreen = false;
+
+// Our GL Specific Initializations
+bool init(void)
+{
+    glShadeModel(GL_SMOOTH);                            // Enable Smooth Shading
+    glClearColor(0.0f, 0.0f, 0.0f, 0.5f);               // Black Background
+    glClearDepth(1.0f);                                 // Depth Buffer Setup
+    glEnable(GL_DEPTH_TEST);                            // Enables Depth Testing
+    glDepthFunc(GL_LEQUAL);                             // The Type Of Depth Testing To Do
+    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);  // Nice perspective
+    return true;
+}
+
+// Our Rendering Is Done Here
+void render(void)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
+    glLoadIdentity();                                   // Reset The Current Modelview Matrix
+
+    // Swap The Buffers To Become Our Rendering Visible
+    glutSwapBuffers();
+}
+
+// Our Reshaping Handler (Required Even In Fullscreen-Only Modes)
+void reshape(int w, int h)
+{
+    glViewport(0, 0, w, h);
+    glMatrixMode(GL_PROJECTION);     // Select The Projection Matrix
+    glLoadIdentity();                // Reset The Projection Matrix
+    if (h == 0) h = 1;
+    gluPerspective(80, (float)w/(float)h, 1.0, 5000.0);
+    glMatrixMode(GL_MODELVIEW);      // Select The Modelview Matrix
+    glLoadIdentity();                // Reset The Modelview Matrix
+}
+
+// Our Keyboard Handler (Normal Keys)
+void keyboard(unsigned char key, int x, int y)
+{
+    switch (key) {
+        case 27:        // When Escape Is Pressed...
+            exit(0);    // Exit The Program
+        break;          // Ready For Next Case
+        default:        // Now Wrap It Up
+        break;
+    }
+}
+
+// Our Keyboard Handler For Special Keys (Like Arrow Keys And Function Keys)
+void special_keys(int a_keys, int x, int y)
+{
+    // PS2 GLUT does not support the original F1/fullscreen logic from NeHe.
+    // Keep special keys no-op for compatibility with ps2glut's limited mapping.
+    (void)a_keys; (void)x; (void)y;
+}
+
+int main(int argc, char** argv)
+{
+    // Note: original NeHe uses a Windows MessageBox to ask for gamemode.
+    // For PS2 we default to windowed mode.
+    glutInit(&argc, argv);                           // GLUT Initializtion
+    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);     // Display Mode (Rgb And Double Buffered)
+    glutInitWindowSize(640, 448);                // If glutFullScreen wasn't called this is the window size
+    glutCreateWindow("NeHe's OpenGL Framework - Lesson 01"); // Window Title
+    init();                                          // Our Initialization
+    glutDisplayFunc(render);                         // Register The Display Function
+    glutReshapeFunc(reshape);                        // Register The Reshape Handler
+    glutKeyboardFunc(keyboard);                      // Register The Keyboard Handler
+    glutSpecialFunc(special_keys);                   // Register Special Keys Handler
+    glutMainLoop();                                  // Go To GLUT Main Loop
+    return 0;
+}