This is how nouveau calculates the viewport width and height. For some reason some games set 0xFFFF in the VIEWPORT_HORIZ and VIEWPORT_VERT registers, maybe those are a misnomer and actually refer to something else?
Long queries write a 128-bit result value to memory, which consists of a 64 bit query value and a 64 bit timestamp.
In this implementation, only select=Zero of the Crop unit is implemented, this writes the query sequence as a 64 bit value, and a 0u64 value for the timestamp, since we emulate an infinitely fast GPU.
This specific type was hwtested, but more rigorous tests should be performed in the future for the other types.
The hardware allows for some rather complicated operations to be performed on the data during the copy, this is not implemented.
Only same-format same-size raw copies are implemented for now.
This is based on research from nouveau. Many things are currently unknown and will require hwtests in the future.
This commit also stubs QueryMode::Write2 to do the same as Write. Nouveau code treats them interchangeably, it is currently unknown what the difference is.
The vertex arrays will be copied to the stream buffer one after the other, and the attributes will be set using the ARB_vertex_attrib_binding extension.
yuzu now thus requires OpenGL 4.3 or the ARB_vertex_attrib_binding extension.
Each predicated instruction will be wrapped in an `if (predicate) { instruction_body; }` in the GLSL, where `predicate` is one of the predicate boolean variables previously set by fsetp.
Predicate variables are now added to the generated shader code in the form of 'pX' where X is the predicate id.
These predicate variables are initialized to false on shader startup and are set via the fsetp instructions.
TODO:
* Not all the comparison types are implemented.
* Only the single-predicate version is implemented.
Subv