3D Game in C++ and OpenGL
The three-dimensional evolution of the previous game, with a flashlight, a minimap and the same SVG arena — shown here on video, because the browser's OpenGL emulation cannot carry its lighting.
- C++
- OpenGL
- GLUT
- GLU
1:41 of recording, about 600 KB, downloaded only when you press play.
Recording of the game running natively: fixed-function OpenGL emulation in the browser cannot drive its lighting. — github.com/viniciuscole/3D-Computer-Graphics
It is the same game as the earlier project, evolved into three dimensions: the arena is still read from an SVG file, still parsed with tinyxml2, and the same character classes — hero, enemy and shot — are now drawn with depth.
Rendering uses immediate-mode, fixed-function OpenGL: three lights, materials, textures and depth testing. One of the lights is a flashlight attached to the player’s arm — there is a mode where the ambient lights switch off and only it lights the scene. Characters are built from spheres (GLU quadrics) and prisms; a minimap marks the player’s position inside the arena.
Why this page only has a video
Emscripten’s fixed-function OpenGL emulation does not implement
GL_SPOT_CUTOFF, GL_SPOT_EXPONENT or GL_SPOT_DIRECTION — the
parameters that turn a positional light into a cone, which is exactly what
the flashlight mode needs. The game compiles and links without complaint;
the screen goes black the moment the flashlight enters the scene, even with
it switched off at other points in the game.
The investigation turned up two more things worth mentioning, because they are honest and a little absurd: the textures were 30 MB of uncompressed BMP (2000×2000 and 3000×2000 pixels, for a 500×500 window), and they load before an OpenGL context exists — native drivers tolerate that, the browser does not.
Rewriting the drawing code for shaders would fix the flashlight, but it would undercut the point of the other demos on this site: that what runs there is the assignment’s own code, compiled, not a rewrite built to fit the browser. So on this project, you watch instead of play.