gallium: add PIPE_CAP_MAX_VARYINGS

Some NVIDIA hardware can accept 128 fragment shader input components,
but only have up to 124 varying-interpolated input components. We add a
new cap to express this cleanly. For most drivers, this will have the
same value as PIPE_SHADER_CAP_MAX_INPUTS for the fragment shader.

Fixes KHR-GL45.limits.max_fragment_input_components

Signed-off-by: Karol Herbst <[email protected]>
[imirkin: rebased, improved docs/commit message]
Signed-off-by: Ilia Mirkin <[email protected]>
Acked-by: Rob Clark <[email protected]>
Acked-by: Eric Anholt <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Cc: 19.0 <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gallium/drivers/panfrost/pan_screen.c b/src/gallium/drivers/panfrost/pan_screen.c
index 5ee3b4c6006..3590b608818 100644
--- a/src/gallium/drivers/panfrost/pan_screen.c
+++ b/src/gallium/drivers/panfrost/pan_screen.c
@@ -250,6 +250,9 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
         case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
                 return 4;
 
+        case PIPE_CAP_MAX_VARYINGS:
+                return 16;
+
         default:
                 return u_pipe_screen_get_param_defaults(screen, param);
         }