Merge branch 'master' of https://github.com/nlguillemot/imgui into nlguillemot-master

Backup polygon mode, draw with filled polygons, restore state, for clients running opengl with glPolygonMode. closes #798

IO: io.MousePos needs to be set to ImVec2(-FLT_MAX,-FLT_MAX) when mouse is unavailable/missing. Previously ImVec2(-1,-1) was enough but we'll now accept negative mouse coordinates.

Examples: OpenGL3+SDL: Fix types to uses GlEnum (#1147)

Merge pull request #1147 from TinyTinni/master ...

Examples: OpenGL3+GLFW3: Fix types to uses GlEnum (#1147)

Renamed ImGuiSetCond_XXX type and enums to ImGuiCond_XXX, kept old enums under #ifdef IMGUI_DISABLE_OBSOLETE_FUNCTIONS

Examples: Enable vsync by default in example applications (#1213, #1151)

add SDL GL3 makefile

fix compilation on MINGW

casting to GLint on init

save and restore sampler in GL 3 examples

fixes types

Fix blend func state save/restore ...

AFAIK there's no such enum as `GL_BLEND_SRC` or `GL_BLEND_DST` in OpenGL3 and OpenGL4.

Maybe they're left over from previous versions? They don't even seem to exist in OpenGL 2.1. In fact checking they were deprecated in OpenGL 1.5 (they exist in 1.3)

Examples: GLFW+GL3, SDL+GL3: Fixed modifying bound Texture0 (#1087, #1088, #1116)

Examples: Speculative fix for OSX Makefile to make Travis happy (re #812)

Examples: GL3: Comments about gl3w (#880)

Minor const fixes for overzealous warnings (#883)

Added a void* user_data parameter to Clipboard function handlers. (#875)

Examples: GLFW+OpenGL3: Fixed Shutdown() calling GL functions with NULL parameters if NewFrame was never called (#800)

Examples: OpenGL2: Uploading font texture as RGBA32 to increase compatibility with users shaders for beginners (#824)

Fix Mac OS X build and remove cruft from Makefile

Examples: OpenGL*: Savnig/restoring existing scissor rectangle for completeness (#807)

Examples: OpenGL3: Revert Makefile change for OSX for now (#812)

Examples: Accessing ImVector fields directly, feel less stl-ey and fix renderer side assert when render list only contains a callback (#810)

Correct name for linking opengl3_example ...

According to glfw offcial site, linking `libglfw.3.dylib` etc should
use `-lglfw`.

Changed this made the compilation on my Mac successfully.

Examples: OpenGL3: Saving/restoring glActiveTexture() state (#602)

IO: Added "Super" keyboard modifiers (corresponding to Cmd on Mac and Windows key in theory although the later is hard to read) (#473) ...

NB: Value not used.

FAQ and comments about the use of ImTextureID (#562, #561, #521, #510, #497, #475 ...)

Examples: OpenGL: Fix early return on zero-sized framebuffer breaking GL state (#486, #547)

Examples: OpenGL: skip rendering and calling glViewport() if we have a zero-fixed buffer (#486)