Compute shader renderer (#2041)

* nothing works yet

* don't double buffer 3D framebuffers for the GL Renderer
looks like leftovers from when 3D+2D composition was done in the frontend

* oops

* it works!

* implement display capture for compute renderer
it's actually just all stolen from the regular OpenGL renderer

* fix bad indirect call

* handle cleanup properly

* add hires rendering to the compute shader renderer

* fix UB
also misc changes to use more unsigned multiplication
also fix framebuffer resize

* correct edge filling behaviour when AA is disabled

* fix full color textures

* fix edge marking (polygon id is 6-bit not 5)
also make the code a bit nicer

* take all edge cases into account for XMin/XMax calculation

* use hires coordinate again

* stop using fixed size buffers based on scale factor in shaders
this makes shader compile times tolerable on Wintel
- beginning of the shader cache
- increase size of tile idx in workdesc to 20 bits

* apparently & is not defined on bvec4
why does this even compile on Intel and Nvidia?

* put the texture cache into it's own file

* add compute shader renderer properly to the GUI
also add option to toggle using high resolution vertex coordinates

* unbind sampler object in compute shader renderer

* fix GetRangedBitMask for 64 bit aligned 64 bits
pretty embarassing

* convert NonStupidBitfield.h back to LF only new lines

* actually adapt to latest changes

* fix stupid merge

* actually make compute shader renderer work with newest changes

* show progress on shader compilation

* remove merge leftover

src/GPU3D_TexcacheOpenGL.h

@@ -0,0 +1,25 @@
+#ifndef GPU3D_TEXCACHEOPENGL
+#define GPU3D_TEXCACHEOPENGL
+
+#include "GPU3D_Texcache.h"
+#include "OpenGLSupport.h"
+
+namespace melonDS
+{
+
+template <typename, typename>
+class Texcache;
+
+class TexcacheOpenGLLoader
+{
+public:
+    GLuint GenerateTexture(u32 width, u32 height, u32 layers);
+    void UploadTexture(GLuint handle, u32 width, u32 height, u32 layer, void* data);
+    void DeleteTexture(GLuint handle);
+};
+
+using TexcacheOpenGL = Texcache<TexcacheOpenGLLoader, GLuint>;
+
+}
+
+#endif