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/OpenGLSupport.h

@@ -28,10 +28,23 @@
 namespace melonDS::OpenGL
 {
 
-bool BuildShaderProgram(const char* vs, const char* fs, GLuint* ids, const char* name);
-bool LinkShaderProgram(GLuint* ids);
-void DeleteShaderProgram(GLuint* ids);
-void UseShaderProgram(GLuint* ids);
+void LoadShaderCache();
+void SaveShaderCache();
+
+struct AttributeTarget
+{
+    const char* Name;
+    u32 Location;
+};
+
+
+bool CompileVertexFragmentProgram(GLuint& result,
+    const std::string& vs, const std::string& fs,
+    const std::string& name,
+    const std::initializer_list<AttributeTarget>& vertexInAttrs,
+    const std::initializer_list<AttributeTarget>& fragmentOutAttrs);
+
+bool CompileComputeProgram(GLuint& result, const std::string& source, const std::string& name);
 
 }