gallium: add PIPE_CAP_MULTIVIEW

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31128>

docs/gallium/screen.rst

@@ -654,6 +654,7 @@ The integer capabilities:
 * ``PIPE_CAP_SHADER_SUBGROUP_SUPPORTED_STAGES``: Bitmask of shader stages which support GL_KHR_shader_subgroup_* intrinsics.
 * ``PIPE_CAP_SHADER_SUBGROUP_SUPPORTED_FEATURES``: Bitmask of shader subgroup features listed in :ext:`GL_KHR_shader_subgroup`.
 * ``PIPE_CAP_SHADER_SUBGROUP_QUAD_ALL_STAGES``: Whether shader subgroup quad operations are supported by shader stages other than fragment shader.
+* ``PIPE_CAP_MULTIVIEW``: Whether multiview rendering of array textures is supported.
 
 
 .. _pipe_capf:

src/gallium/auxiliary/util/u_screen.c

@@ -100,6 +100,7 @@ u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
    case PIPE_CAP_SEAMLESS_CUBE_MAP:
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
+   case PIPE_CAP_MULTIVIEW:
       return 0;
 
    case PIPE_CAP_SUPPORTED_PRIM_MODES_WITH_RESTART:

src/gallium/include/pipe/p_defines.h

@@ -974,6 +974,7 @@ enum pipe_cap
    PIPE_CAP_SHADER_SUBGROUP_SUPPORTED_STAGES,
    PIPE_CAP_SHADER_SUBGROUP_SUPPORTED_FEATURES,
    PIPE_CAP_SHADER_SUBGROUP_QUAD_ALL_STAGES,
+   PIPE_CAP_MULTIVIEW,
    PIPE_CAP_LAST,
    /* XXX do not add caps after PIPE_CAP_LAST! */
 };

src/mesa/state_tracker/st_extensions.c

@@ -908,6 +908,7 @@ void st_init_extensions(struct pipe_screen *screen,
       { o(INTEL_blackhole_render),           PIPE_CAP_FRONTEND_NOOP                    },
       { o(ARM_shader_framebuffer_fetch_depth_stencil), PIPE_CAP_FBFETCH_ZS             },
       { o(MESA_texture_const_bandwidth),     PIPE_CAP_HAS_CONST_BW                     },
+      { o(OVR_multiview)               ,     PIPE_CAP_MULTIVIEW                        },
    };
 
    /* Required: render target and sampler support */