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This is a modified version of TinyGL 0.4 intended for use with ResidualVM.
The changes made from the original version of TinyGL 0.4 are:
* Changed file extensions from *.c to *.cpp to compile as C++.
* Included only files needed by ResidualVM.
* Changed include paths in source files.
* Added needed type casts and fixes for proper compile.
* Added 't/T' prefix to prevent OpenGL name clashes.
* Added light shading texture mapping mode.
* Removed unneeded code.
* Introduced second 32-bit z-buffer for 3d objects only,
and kept 16-bit only for static z-buffer bitmaps.
* Added support for drawing in shadow mode (generate mask and polygon shadow - ztriangle_shadow.cpp file).
* Added support for reading in RGB/BGR-textures, although the only internal format is still RGB565
* Added TGL_BGR/TGL_RGB definitions to gl.h, verifying against SDL_opengl.h that the values are ok.
* Added additional functions missing, like glColor4ub. (To make the code similar with the GL-code we use)
* Added simplistic glColorMask implementation, on/off.
* Applied some C++-isms:
* "for(int i = 0;" instead of "int i; for (i = 0;",
* struct structName instead of typedef struct {} structName;
* pass-by-const-reference instead of by-value when possible
* Changed the math-functions to use const-pointers if possible.
* Reformatted the source to use the same code-formatting conventions as the rest of ResidualVM
(indentation-wise, not variable-naming wise)
* Refactored all the maths code in a C++ fashion, removed some unused functions.
* Heavily refactored the triangle and line drawing routines
* Renamed ZBuffer into FrameBuffer and moved all the external C functions as member functions.
* Added implementation of tglBlendFunc and support for 8-bit alpha.
* Added implementation of tglAlphaTestFunc.
* Added implementation of tglDepthFunc.
* Added an API that enables the user to perform color and z buffer blitting.
* Implemented a system that enables to defer draw calls.
* Implemented dirty rectangle system that prevents redrawing of unchanged region of the screen.
For more information refer to log changes in github: https://github.com/residualvm/residualvm
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