Texture Manager and OpenGLGraphic description
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Texturing mechanism in OpenGL is next:
- read the data in a buffer where you know the format (for instance RGB or RGBA)
- convert it from pixel surface to a texture
- get an index that may be used to "paint the geometry" using glEnable(GL_TEXTURE_2D) call using different parameters, as current color, transparency, etc.
Restrictions of OpenGL implementation:
- OpenGL should be implemented in it's own thread, else the convert textures will not appear to the drawing.
- the textures should be sized as power of two, etc. and the scaling may take time to complete
The conclusion is simple,
The flow is next:
- OpenGLEngine creates an TextureManager
- at every frame at start we should
Manages multiple graphics and geometry lists:
- textures for pending for convert
std::list <OpenGLGraphic*> WaitForConvert;
- texture indexes which needs to be removed
std::list <OpenGLTexture> WaitForRelease;
- Geometry cache, it keeps all geometry with uniques IDs. It can be used for store local objects.
std::map<std::string, MeshFrame*> Graphics;