catastropher / x3d-68k Goto Github PK

3D polygons have a number of utility functions, but we're lacking their 2D counterparts:

void x3d_polygon2d_translate(X3D_Polygon2D* poly, X3D_Vex2D shift);
void x3d_polygon2d_reverse(X3D_Polygon2D* poly);
void x3d_polygon2d_center(X3D_Polygon2D* poly, X3D_Vex2D* dest);
void x3d_polygon2d_scale(X3D_Polygon2D* poly, fp8x8 scale);
void x3d_polygon2d_copy(X3D_Polygon2D* src, X3D_Polygon2D* dest);

Take a look at C/geo/polygon.c and headers/X3D_polygon.h

With interrupts enabled on the Nspire, a clock cursor automatically appears and is drawn to the screen. While annoying, it's actually causing a crash. The Nspire OS assumes the LCD is in 16-bit color mode, but X3D uses 8-bit color. So, the screen is only half as big as it expects and it draws it off the screen.

Solution: find a way to disable the clock cursor.

Screen initialization shouldn't be performed in the vidrestart callback - it should be performed in the platform initialization code.

Large surfaces seem to be cut off for some reason while rendering them on a polygon (see below, screenshot from XBuilder).

While rendering, this debug info was dumped to the console, which may be relevant:

/home/michael/code/X3D-68k/src/C/render/geo/render_polygon_texture_generic.h:59:25: runtime error: left shift of negative value -1048
/home/michael/code/X3D-68k/src/C/render/geo/render_polygon_texture_generic.h:50:19: runtime error: signed integer overflow: 1614449424 + 1614449424 cannot be represented in type 'int'
/home/michael/code/X3D-68k/src/C/render/geo/render_polygon_flat.c:47:19: runtime error: signed integer overflow: 2109702881 + 45809696 cannot be represented in type 'int'
/home/michael/code/X3D-68k/src/C/render/surface.c:59:56: runtime error: left shift of negative value -516
/home/michael/code/X3D-68k/src/C/render/geo/render_polygon_texture_generic.h:59:25: runtime error: left shift of negative value -24634
/home/michael/code/X3D-68k/src/C/render/geo/render_polygon_texture_generic.h:50:19: runtime error: signed integer overflow: 1614446591 + 1614451024 cannot be represented in type 'int'

You might want to consider renaming the repository, as this is no longer a 68k project.