renderer: optimise shader usage further, split shaders and add more caching (#12992)

* shader: split CM rgba/rgbx into discard ones

make it branchless if we have no discards.

* shader: ensure we dont stall on vbo uv buffer

if we render a new texture before the previous was done gpu wise its
going to stall until done, call glBufferData to orphan the data.
this allows the driver to return a new memory block immediately
if the GPU is still reading from the previous one

* protocols: ensure we reset GL_PACK_ALIGNMENT

reset GL_PACK_ALIGNMENT back to the default initial value of 4

* shader: use unsigned short in VAO

loose a tiny bit of precision but gain massive bandwidth reductions.
use GL_UNSIGNED_SHORT and set it as normalized. clamp and round the UV
for uint16_t in customUv.

* shader: interleave vertex buffers

use std::array for fullverts, use a single interleaved buffer for
position and uv, should in theory improve cache locality. and also remove
the need to have two buffers around.

* shader: revert precision drop

we need the float precision because we might have 1.01 or similiar
floats entering CM shader maths, and rounding/clamping those means the
maths turns out wrong. so revert back to float, sadly higher bandwidth
usage.

* update doColorManagement api

* convert primaries to XYZ on cpu

* remove unused primaries uniform

---------

Co-authored-by: UjinT34 <ujint34@mail.ru>

src/protocols/Screencopy.cpp

@@ -425,6 +425,7 @@ bool CScreencopyFrame::copyShm() {
         }
     }
 
+    glPixelStorei(GL_PACK_ALIGNMENT, 4);
     g_pHyprOpenGL->m_renderData.pMonitor.reset();
 
     glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);

src/protocols/ToplevelExport.cpp

@@ -334,6 +334,7 @@ bool CToplevelExportFrame::copyShm(const Time::steady_tp& now) {
     }
 
     outFB.unbind();
+    glPixelStorei(GL_PACK_ALIGNMENT, 4);
     glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 
     return true;