From 5ddab654d93f6f23f3b0f0fa79b086810b3f5c58 Mon Sep 17 00:00:00 2001
From: Timothy Arceri <tarceri@itsqueeze.com>
Date: Fri, 26 Jun 2020 19:56:11 +1000
Subject: [PATCH] mesa: add _mesa_program_state_value_size() helper
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This allows us to query the uniform size required to store the
state value.

CC: <stable@lists.freedesktop.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5656>
---
 src/mesa/program/prog_statevars.c | 9 +++++++++
 src/mesa/program/prog_statevars.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/src/mesa/program/prog_statevars.c b/src/mesa/program/prog_statevars.c
index 1a3c8ab654f..71c33132a00 100644
--- a/src/mesa/program/prog_statevars.c
+++ b/src/mesa/program/prog_statevars.c
@@ -630,6 +630,15 @@ fetch_state(struct gl_context *ctx, const gl_state_index16 state[],
    }
 }
 
+unsigned
+_mesa_program_state_value_size(const gl_state_index16 state[STATE_LENGTH])
+{
+   if (state[0] == STATE_LIGHT && state[2] == STATE_SPOT_CUTOFF)
+      return 1;
+
+   /* Everything else is packed into vec4s */
+   return 4;
+}
 
 /**
  * Return a bitmask of the Mesa state flags (_NEW_* values) which would
diff --git a/src/mesa/program/prog_statevars.h b/src/mesa/program/prog_statevars.h
index de457d1a7f4..4dc0123776f 100644
--- a/src/mesa/program/prog_statevars.h
+++ b/src/mesa/program/prog_statevars.h
@@ -139,6 +139,8 @@ extern void
 _mesa_load_state_parameters(struct gl_context *ctx,
                             struct gl_program_parameter_list *paramList);
 
+extern unsigned
+_mesa_program_state_value_size(const gl_state_index16 state[STATE_LENGTH]);
 
 extern GLbitfield
 _mesa_program_state_flags(const gl_state_index16 state[STATE_LENGTH]);