What changed in EDuke32, build by build

Support separate .glsl shaders in Windows MSVC builds

osdfuncs.cpp: fix OSD background sometimes not rendering with the correct gl state

Support clamping in polymost1Frag.glsl and use it for sprites

Separate out polymost1Frag and polymost1Vert shaders from polymost.cpp and add rules for building in the GNUmakefile.

polymost.cpp: Adjust shaders to use texture2DGradARB() if available

Improve depth fighting by pushing out the near plane and improve near plane clipping by depth clamping.

If GL_ARB_clip_control & GL_ARB_depth_clamp are available, reflect that in glinfo

Update GLAD to 0.1.30 and add GL_ARB_clip_control, GL_ARB_depth_clamp, and GL_ARB_shader_texture_lod extensions

game.cpp: temporarily limit A_Spawn() owner changes from r7738 to locators

Disable -malign-double on i386 as libraries would need to be compiled with it.

Fix 32-bit Polymost issues by enabling SSE instructions and setting GCC to use SSE floating point math exclusively.

actors.cpp: Change demo camera path following behaviour to search for locators based on a hitag channel to avoid locator lotag contention.

game.cpp: When A_Spawn() is spawning from an already existing sprite, do not reset the owner field if it has been overridden from the default.

polymost.cpp: Fix polymost_domost() issue with COMBINE_STRIPS where in certain cases, merging with the viewport nodes caused accidental reading of sentinel node values.

Use stencil buffer in Polymost to restrict mirrors to only render within the region of the screen occupied by the mirror wall.

winlayer.cpp: fix videoBeginDrawing() to return an intptr_t to mirrorBuffer when inpreparemirror

engine.cpp: fix sprite sorting/adjustment issue introduced in r7612 that caused sprites with the same y value at the end of the sorted array to not be adjusted properly

polymost.cpp: Fix issue where state would not be reset properly in polymost_drawmaskwall() when rendering translucent maskwalls with no texture

polymost.cpp: fix polymost_dorotatesprite() alpha test/blend issue introduced in r7619

polymost.cpp: fix issue where floors & ceilings with DAMETH_MASKPROPS were not being blended

engine.cpp: fix bug in killsprite where sprites were not being removed properly after sorting changes

Fix Polymer skybox bug introduced in r7620

Fix polymost_drawtilescreen() to not be improperly affected by globalshade.

Remove enabling/disabling of deprecated GL_TEXTURE_2D in Polymost.

Reduce state changes and fix translucent maskwall depth buffer issue

Fix maskwall array indirection bug and two if conditional oversights from r7612

polymost.cpp: switch from writing gl_FragColor to writing gl_FragData[0] in order to reduce VGPR usage on AMD cards

Fix depth buffer issue causing translucent sprites to not render properly in Polymost.

polymost.cpp: fix fragment shader issue where fullbrights in a texture could affect rendering when u_useColorOnly was enabled

engine.cpp: lintersect(): use klabs() instead of abs()

Fix issue where swingdoors would refuse to open or close if an enemy was in front of the door in an overlapping but unrelated/disjoint sector

engine.cpp: lintersect(): fix integer overflow and negative case issue

Re-introduce earlier lintersect() work that was reverted.

engine.cpp: fix crash when calling `setrendermode 3` where PolymostProcessVoxels would be called before Polymost is initialized.

polymost.cpp: temporarily disable experimental r_enablepolymost2 cvar

polymost.h: fix order of parameters to match polymost.cpp

polymost.cpp: fix lockup bug that would occur with polymost_waitForSubBuffer() when glClientWaitSync consistently returned GL_WAIT_FAILED on certain hardware/drivers.

screens.cpp: Show average game update time over the last 100 game updates