gallium: Add a pipe cap for whether primitive restart works for patches.

Some hardware supports primitive restart on patch primitives, and other
hardware does not.  Modern GL and ES include a query for this feature;
adding a capability bit will allow us to answer it.

As far as I know, AMD hardware does not support this feature, while
NVIDIA and Intel hardware does.  However, most Gallium drivers do not
appear to support tessellation shaders yet.  So, I've enabled it for
nvc0 and disabled it everywhere else.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/docs/source/screen.rst

@@ -338,6 +338,8 @@ The integer capabilities:
   and accesses to unbound resources.
 * ``PIPE_CAP_CULL_DISTANCE``: Whether the driver supports the arb_cull_distance
   extension and thus implements proper support for culling planes.
+* ``PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES``: Whether primitive restart is
+  supported for patch primitives.
 
 
 .. _pipe_capf:

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -261,6 +261,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
 	case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
 	case PIPE_CAP_CULL_DISTANCE:
+	case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 		return 0;
 
 	case PIPE_CAP_MAX_VIEWPORTS:

src/gallium/drivers/i915/i915_screen.c

@@ -272,6 +272,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
    case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
 
    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:

src/gallium/drivers/ilo/ilo_screen.c

@@ -501,6 +501,7 @@ ilo_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
    case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -323,6 +323,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_PCI_FUNCTION:
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
    }
    /* should only get here on unhandled cases */

src/gallium/drivers/nouveau/nv30/nv30_screen.c

@@ -195,6 +195,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
    case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nv50/nv50_screen.c

@@ -248,6 +248,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_PCI_FUNCTION:
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -228,6 +228,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_STRING_MARKER:
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 1;
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
       return (class_3d >= NVE4_3D_CLASS) ? 1 : 0;

src/gallium/drivers/r300/r300_screen.c

@@ -217,6 +217,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
 	case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
         case PIPE_CAP_CULL_DISTANCE:
+        case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
             return 0;
 
         /* SWTCL-only features. */

src/gallium/drivers/r600/r600_pipe.c

@@ -367,6 +367,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_QUERY_BUFFER_OBJECT:
 	case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
 	case PIPE_CAP_CULL_DISTANCE:
+	case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 		return 0;
 
 	case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:

src/gallium/drivers/radeonsi/si_pipe.c

@@ -392,6 +392,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_STRING_MARKER:
 	case PIPE_CAP_QUERY_BUFFER_OBJECT:
 	case PIPE_CAP_CULL_DISTANCE:
+	case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 		return 0;
 
 	case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:

src/gallium/drivers/softpipe/sp_screen.c

@@ -273,6 +273,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_PCI_DEVICE:
    case PIPE_CAP_PCI_FUNCTION:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
       return 4;

src/gallium/drivers/svga/svga_screen.c

@@ -407,6 +407,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_QUERY_BUFFER_OBJECT:
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
    }
 

src/gallium/drivers/swr/swr_screen.cpp

@@ -359,6 +359,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_PCI_FUNCTION:
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
    }
 

src/gallium/drivers/vc4/vc4_screen.c

@@ -210,6 +210,7 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
         case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
         case PIPE_CAP_CULL_DISTANCE:
+        case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
                 return 0;
 
                 /* Stream output. */

src/gallium/drivers/virgl/virgl_screen.c

@@ -242,6 +242,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
    case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
    case PIPE_CAP_VENDOR_ID:
       return 0x1af4;

src/gallium/include/pipe/p_defines.h

@@ -727,6 +727,7 @@ enum pipe_cap
    PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT,
    PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR,
    PIPE_CAP_CULL_DISTANCE,
+   PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES,
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)