We have a per-thread pointer to select which api struct is used, and GL functions are pound-defined to call the versions in that struct.
GL/GLES surfaces can use one of the loader function to load their api, and the prepare proc of the surface sets its api as the current one
before gl calls are issued.
- Remove attributes/color arguments in functions where we don't need them anymore (since they're defined when calling mg_next_shape())
- Renamed "_with_zindex" functions with "_path" -> these function only fill a path (eg rect), but don't increment the current shape
- Simplified shader names, prefix embedded strings by "glsl_"
- Extracted shader compilation in common function
- Add shader version string and common structs in canvas code rather than in every shader file
- Renamed zIndex with shapeIndex everywhere
- Reverted to using 4 bits of subpixel precision and computing cross products with 32 bits integers, for perf reasons
- Fixed some confusion in tile array size vs number of elements (could still clean-up naming a bit though)
- Fixed bug where triangles on the left or below canvas boundaries where bucketted to the first colum/row of tiles
- Fixed bug in mouse button message handling (was always sending press on left button)
martinfouilleul