Mesa (main): zink: clamp PIPE_SHADER_CAP_MAX_INPUTS for xfb

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Module: Mesa
Branch: main
Commit: 5d1b81d8ac9cab3f9213b7d19ac2f3035cf60a3c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=5d1b81d8ac9cab3f9213b7d19ac2f3035cf60a3c

Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date:   Mon Nov  1 10:44:59 2021 -0400

zink: clamp PIPE_SHADER_CAP_MAX_INPUTS for xfb

vertex shader stages that can produce xfb must have
their input size clamped to the compiler define MAX_VARYING
to successfully be able to export an xfb output for each input

fixes KHR-GL46.geometry_shader.limits.max_input_components

cc: mesa-stable

Reviewed-by: Dave Airlie <airlied at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13632>

---

 src/gallium/drivers/zink/zink_screen.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/gallium/drivers/zink/zink_screen.c b/src/gallium/drivers/zink/zink_screen.c
index a07083213f2..fd8dcf2f82a 100644
--- a/src/gallium/drivers/zink/zink_screen.c
+++ b/src/gallium/drivers/zink/zink_screen.c
@@ -790,6 +790,14 @@ zink_get_shader_param(struct pipe_screen *pscreen,
       default:
          return 0; /* unsupported stage */
       }
+      switch (shader) {
+      case PIPE_SHADER_VERTEX:
+      case PIPE_SHADER_TESS_EVAL:
+      case PIPE_SHADER_GEOMETRY:
+         /* last vertex stage must support streamout, and this is capped in glsl compiler */
+         return MIN2(max, MAX_VARYING);
+      default: break;
+      }
       return MIN2(max, 64); // prevent overflowing struct shader_info::inputs_read
    }