Intro to OpenGL in Game Development - Ted Bisson at USF

Computer Graphics and the Game Industry Speaker: Ted Bisson

Computer Graphics and Games • For today: • Who am I? • A brief introduction to OpenGL • The Game Industry

Who am I? • Ted Bisson • USF class of 1998, • Mathematics and Computer Science • Senior Programmer, Blizzard Entertainment • Diablo II, Diablo II: Lord of Destruction

OpenGL What is OpenGL?

OpenGL Application OpenGL 3D Hardware

OpenGL • OpenGL vs. DirectX • DirectX runs on Windows platforms • OpenGL is relatively universal • DirectX is better optimized for Windows platforms • But it’s ok, they are more the same than different!

OpenGL: 3D Engine Basics • Viewports • Matrices • Vertex Lists • Triangle Lists • Lights • Textures

The Demo Program

Structure of the Demo System WinMain, Draw, Utility, COpenGL Primitives CVector, CMatrix, CColor, CFile, CLine, CPath Containers CLineList, CVertexList, CTriangleList Draw Objects CDisc, CModel

Structure of the Demo WinMain // Initialization Create a window (); Initialize OpenGL (); // Message loop while (not done) { if (there is a message) { Pass to appropriate message handler. } else { DrawProcess (); } }

Structure of the Demo DrawProcess // Render the current scene. sRenderScene (); // Synchronize to constant frame rate. if (time to update scene) sUpdateScene ();

Structure of the Demo sRenderScene // Begin processing the scene, this includes // clearing the memory buffer. // Submit objects to be rendered. // End scene processing. // Present the rendered scene.

Structure of the Demo Submitting objects to the API // Specify modes, and begin submitting data. glPolygonMode (GL_FRONT, GL_FILL); glBegin (GL_TRIANGLES); // For each object, submit vertex data. glColor3f (red, green, blue) glNormal3f (normal_x, normal_y, normal_z); glVertex3f (position_x, position_y, position_z); // Indicate the end of this object. glEnd ();

OpenGL Questions about OpenGL?

Intro to OpenGL in Game Development - Ted Bisson at USF