Changes from 5.1.5 to 5.1.6 (March 2013)
========================================

The main developers this time were: Trent Gamblin, Paul Suntsov, Peter Wang.

Core:

- Fix use of clobbered return value from setlocale() on X11.

- Register system interface even if no display driver available on Windows.

- Fix use of double math functions for float arguments (Nick Trout).

Shaders:

- Revamped shader API. The shader API is now part of the core library,
and the shader addon removed.

- Shaders are now a per-bitmap property, set with al_use_shader.
A bitmap without a set shader uses a default shader internally,
that allows Allegro drawing functions to work as in non-programmable
pipeline mode.

- Shader variable setters operate on the shader of the target bitmap.

- Rename ALLEGRO_USE_PROGRAMMABLE_PIPELINE to ALLEGRO_PROGRAMMABLE_PIPELINE.

- Rename al_link_shader to al_build_shader.

- Remove al_set_shader.

- Remove the al_set_shader_*_array functions. These functions cannot
be easily (or at all) implemented with the D3D backend.

- Add al_get_shader_platform and al_get_default_shader_source.

- Remove al_get_opengl_program_object, al_set_opengl_program_object,
al_get_direct3d_effect, al_set_direct3d_effect.

- Remove Cg shader backend.

- Add macros for shader variable names (Jon Rafkind).

Displays:

- Made al_get_display_mode return the closest thing to a pixel format
possible with the WGL driver (tobing).

- Move WGL context destruction out of the message pump thread and into
the user/main thread.

- Allow command-tab to work in fullscreen window mode on OS X.

- Remove "user_reload" parameter from al_acknowledge_drawing_resume.

- Don't crash in al_create_display if there is no display driver.

- Don't crash at shutdown if there is no display driver (Windows).

- Don't fail init if both D3D, GL drivers unavailable (Windows).

- Sync bitmaps before resizing display to prevent changes being lost
after the resize (D3D).

- Load the D3D9X module during display creation and unload it when the
D3D system shuts down.

- Run fullscreen toggle on main thread (OS X).

- Destroy the backbuffer bitmap when destroying the display (OS X).

- Switch to new NSTrackingArea API (OS X).

- Set ALLEGRO_NO_PRESERVE_TEXTURE on backbuffer (OpenGL).

Graphics:

- Let al_destroy_bitmap implicitly untarget the bitmap on the calling
thread.

- Fix a bug where bitmap locking may change the target bitmap but
not restore it back to NULL (OpenGL).

- Use memory bitmap drawing when either bitmap is locked (OpenGL).

- Fix a crash in D3D destroying sub-bitmaps.

- Add const qualifiers to glUniform*v() functions (Aaron Bolyard).

Input:

- Partially fix mouse buttons "sticking" on Mac, e.g. holding the
mouse and toggling fullscreen window.

- al_set_mouse_xy on Windows resulted in the mouse getting set to the wrong
position in windowed modes

- Scale the user supplied mouse cursor if it's too big (Windows).

- Add key constants for some Android keys, those that are used in Xperia
Play controls.

Audio addons:

- Fix PulseAudio driver trying to connect to a non-existent server forever.

- Avoid memory leaks with audio event source.

- Use smaller buffer size for OpenSL.

Image addon:

- Use Allegro built-in loaders in preference to OS X loaders for BMP/TGA/PCX.
The OS X TGA loader doesn't support alpha and this is also more consistent.

Font addons:

- Make al_init_font_addon return success value.

- Make al_init_ttf_addon return true for subsequent calls.

Native dialogs addon:

- Fix a crash on iOS due to threading/TLS issues geting the display
(Nick Trout).

Primitives addon:

- Speed up al_triangulate_polygon_with_holes.

- Speed up drawing of the rounds for polylines.

- Add custom vertex attributes to the primitives addon.

- Replace vertex shader binary generated by vsa.exe (removed from DirectX
SDKs for a while now) by that generated by fxc.exe.

- A minor revamp of the HLSL default shader system in the primitives addon.

- Fix a few incorrect usages of al_lock_vertex_buffer

- Disallow 3 component vectors for ALLEGRO_PRIM_TEX_COORD.

- Add a whole bunch of new ALLEGRO_PRIM_STORAGE values.

- Primitives addon was ignoring the filter settings of textures in the D3D
backend.

Android port:

- Generate KEY_CHAR on Android.

- Add key constants for Android.

- Set target bitmap to display backuffer after program is resumed.

- Use different functions for OpenGL ES 1 and OpenGL ES 2 on Android.

iOS port:

- Support stencil buffer on iOS.

- Remove unnecessary autorelease pools. There was a crash when using
Airplay that goes away without the pools.

- Make Airplay work the standard way most apps do unless the
Allegro user explicitly creates a display on the second screen.

- Don't autorotate displays other than device.

- Fix some threading and memory issues.

Raspberry Pi port:

- Allow for color size, depth and stencil sizes.

- Support al_show_mouse_cursor and al_hide_mouse_cursor.
Disabled as it sometimes ends up stuck on the screen until reboot.

Examples:

- New examples: ex_prim_shader, ex_shader_target.

Other:

- Various documentation updates.

- Minor fixes and code refactoring.

Those two were renamed sometime between 5.1.5 and > > 5.1.6, so they should now be:

#define ALLEGRO_CFG_SHADER_GLSL
#define ALLEGRO_CFG_SHADER_HLSL

"the" issue? You make it sound like a known issue that everyone would be aware of. Provide a test case.

Sweet!!!~~~~~ Just built SVN too

OK. I updated Windows packages. Allegro is now compiled with shader support as promised.
Please enjoy.

TortoiseSVN is so nice....