OpenGL issues (DEPTH_TEST) in Serious Sam Classic

Depth test does not work. Seems to be a bug somewhere in wgl/glx translation layer. Check if depth buffer size translated correctly
SeriousEditor has the same issue
In D3D mode game does not draw anything with such errors:

Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)
Mesa: User error: GL_INVALID_ENUM in glMatrixMode(mode)

https://github.com/ValveSoftware/wine/blob/proton_3.7/dlls/opengl32/wgl.c
vega 11, amdgpu
glxinfo:
https://pastebin.com/LpjkiwyD

Start with dlls/opengl32/wgl.c and the reported DEPTH_TEST, depth-buffer, and glMatrixMode errors; compare the WGL/GLX translation with the linked Proton version. Reproduce in Serious Sam Classic or SeriousEditor using the supplied Mesa and glxinfo context, then verify that OpenGL and D3D modes render without the reported errors.