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POBlank Screen in OpenGL and Glut
 

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  1. POBlank Screen in OpenGL and Glut
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    <p>When attempting to draw a cube, I get, instead, a blank screen. It is a screen with the background of my <code>glClearColor</code>.</p> <p>My code is in so many files that I can't really post it all here, so I've placed it <a href="http://github.com/CosineGaming/CodeIndigo" rel="nofollow noreferrer">on Github</a>. You'll want to look at it. It's a visual studio 2012 file but all the source is there for any IDE. Though very incomplete, here are some snippets:</p> <p><strong>EDIT:</strong> I am now able to see my shapes, but they are completely lightless. Even when I use the already made normals in <code>glutSolidTeapot</code>, it looks flat. Also, even though I specify far cutting plane to be 1000, my shapes disappear far before that. I've updated my code to be more recent.</p> <p>CodeIndigo.cpp</p> <pre><code>// Entry point! // Code indigo is a 3d mystery game. Readme for more information. #include "CodeIndigo.h" #include &lt;iostream&gt; void box_update (const int&amp; frame, const Object&amp; self) { return; } void update (int frame) { if (Indigo::keys ['w']) { Indigo::Current_World.camera.Move (0.05); } if (Indigo::keys ['s']) { Indigo::Current_World.camera.Move (-0.05); } if (Indigo::keys ['a']) { Indigo::Current_World.camera.Move (0.0, -0.05); } if (Indigo::keys ['d']) { Indigo::Current_World.camera.Move (0.0, 0.05); } if (GL_NO_ERROR != glGetError ()) { std::cout &lt;&lt; "Error: " &lt;&lt; glGetError () &lt;&lt; std::endl; } if (Indigo::keys ['3']) { Camera camera = Indigo::Current_World.camera; std::cout &lt;&lt; camera.X &lt;&lt; ", " &lt;&lt; camera.Y &lt;&lt; ", " &lt;&lt; camera.Z &lt;&lt; " looking at " &lt;&lt; camera.eye.Get_X () &lt;&lt; ", " &lt;&lt; camera.eye.Get_Y () &lt;&lt; ", " &lt;&lt; camera.eye.Get_Z () &lt;&lt; std::endl; } } void mouse_moved (int x, int y) { static const float sensitivity = 0.5; Indigo::Current_World.camera.eye.Add_Direction (0.0, x * sensitivity, y * -1 * sensitivity); std::cout &lt;&lt; x &lt;&lt; ", " &lt;&lt; y &lt;&lt; std::endl; } int main(int argc, char ** argv) { Indigo::Initialize (argc, argv, " ~ Code Indigo", 800, 600, true, 60, Indigo::Sky_Color, 60); Mesh box = Mesh::Sphere (0.5); Object add = Object(0.0, 0.0, -1.0, box, Indigo::White_Color, 40.0f, box_update); int object = Indigo::Current_World.Add_Object (add); Indigo::Update_Function = update; Indigo::Relative_Mouse_Moved_Function = mouse_moved; Indigo::Current_World.lighting.Add_Light (0.0, 2.0, 0.0); Indigo::Current_World.camera.Place (0.0, 0.0, 0.0); Indigo::Current_World.camera.eye.Set_Direction (1.0, 90.0, -2.8); Indigo::Run (); return (0); } </code></pre> <p>Indigo::Initialize</p> <pre><code>// Initializes window and rendering matrices. void Initialize (int argc, char ** argv, const char * window_name, const int&amp; window_width, const int&amp; window_height, const bool&amp; fullscreen, int field_of_view, float * background, int max_framerate) { glutInit (&amp;argc, argv); glutInitDisplayMode (GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH); glutInitWindowSize (window_width, window_height); glutCreateWindow (window_name); if (fullscreen) { glutFullScreen (); } if (background) { glClearColor (background [0], background [1], background [2], 1.0); } else { glClearColor (Sky_Color [0], Sky_Color [1], Sky_Color [2], 1.0); } Frame_Length_Minimum = 1000 / max_framerate; glutSetKeyRepeat (GLUT_KEY_REPEAT_OFF); glutDisplayFunc (Render); glutTimerFunc (10, Update, 0); glutReshapeFunc (Reshape); glutPassiveMotionFunc (Mouse_Moved); glutMouseFunc (Mouse_Button); glutKeyboardFunc (Key_Pressed); glutKeyboardUpFunc (Key_Released); glMatrixMode (GL_PROJECTION); Reshape (); glMatrixMode (GL_MODELVIEW); glLoadIdentity (); glShadeModel (GL_SMOOTH); glEnable (GL_DEPTH_TEST); return; } </code></pre> <p>Indigo::Reshape</p> <pre><code>// Acts for when the window reshapes void Reshape (int width, int height) { bool viewport = true; if (0 == width) { width = glutGet (GLUT_WINDOW_WIDTH); viewport = false; } if (0 == height) { height = glutGet (GLUT_WINDOW_HEIGHT); viewport = false; } if (viewport) { glViewport (0, 0, width, height); } glLoadIdentity (); gluPerspective (Field_Of_View, (float) width / (float) height, 0.5, 1000.0); } </code></pre> <p>World::Render</p> <pre><code>void World::Render (void) const { // Renders every object in the world glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode (GL_PROJECTION); Indigo::Reshape (); glMatrixMode (GL_MODELVIEW); camera.Look (); lighting.Position_Lights (); // &lt;DELETE&gt; float full_array [] = {1.0, 1.0, 1.0, 1.0}; glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, full_array); glMaterialfv (GL_FRONT_AND_BACK, GL_SPECULAR, full_array); glMaterialf (GL_FRONT_AND_BACK, GL_SHININESS, 60.0); glutSolidTeapot (0.3); // &lt;/DELETE&gt; for (int Object_ID=0; Object_ID&lt;objects.size (); ++Object_ID) { const_cast &lt;Object&amp;&gt; (objects [Object_ID]).Render (); } glutSwapBuffers (); return; } </code></pre> <p>Object::Render</p> <pre><code>// Renders the object void Object::Render (void) const { float full_array [] = {1.0, 1.0, 1.0, 1.0}; glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, object_color ? object_color : full_array); glMaterialfv (GL_FRONT_AND_BACK, GL_SPECULAR, full_array); glMaterialf (GL_FRONT_AND_BACK, GL_SHININESS, object_shine); glPushMatrix (); glTranslatef (X, Y, Z); std::vector &lt;Vertex&gt; points = Data.Get_Vertices (); glBegin (Render_Types [Data.Group_Size]); for (int Point=0; Point&lt;points.size (); Point++) { // When each polygon is finished, calculate a light normal if ((Point + 1) % (Data.Group_Size == 0 ? 3 : Data.Group_Size) == 0) { Vertex two = points [Point - 1] - points [Point - 2]; Vertex three = points [Point] - points [Point - 2]; glNormal3f (two.Z * three.Y - two.Y * three.Z, two.X * three.Z - two.Z * three.X, two.Y * three.X - two.X * three.Y); } Vertex Cursor = points [Point]; glVertex3f (Cursor.X, Cursor.Y, Cursor.Z); } glEnd (); glPopMatrix (); return; } </code></pre> <p>Sorry for too much code!</p> <p>The difficulty is that I don't know whether the problem lies in my:</p> <ul> <li>Setting up of the projection matrix with <code>gluPerspective</code></li> <li>Some Glut thing I don't know about</li> <li>Drawing the shape</li> <li>Anything else</li> </ul>
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    1. CO12mb attached file? That's a no-go. How about you try and place your drawing-related code here? A single file is more than enough for a simple operation such as drawing a cube.
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    2. COThe trouble here is that I've created a very OOP framework and the cube is simply a test. I have just replaced the download to not include the executables and solution files that I didn't know would be so big. It's now 13 KB. I've edited the question to include some snippets for convenience, also. Thanks for the tip-off on the file size.
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    3. COYou've got way too much code already written for something you didn't even try to render a cube with. It's usually better to approach this kind of stuff more incrementally.
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      1. USAnthony Vallée-Dubois
 

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