From 647344bf3e739c537a97ae54046b6b55cd068721 Mon Sep 17 00:00:00 2001
From: Francisco Jerez <currojerez@riseup.net>
Date: Fri, 22 Nov 2013 19:58:10 -0800
Subject: mesa: Validate image units when the texture state changes.

Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
---
 src/mesa/main/shaderimage.c | 11 +++++++++++
 src/mesa/main/shaderimage.h |  9 +++++++++
 src/mesa/main/texstate.c    |  3 +++
 3 files changed, 23 insertions(+)

diff --git a/src/mesa/main/shaderimage.c b/src/mesa/main/shaderimage.c
index ade0a7b..80c4693 100644
--- a/src/mesa/main/shaderimage.c
+++ b/src/mesa/main/shaderimage.c
@@ -380,6 +380,17 @@ validate_image_unit(struct gl_context *ctx, struct gl_image_unit *u)
    return GL_TRUE;
 }
 
+void
+_mesa_validate_image_units(struct gl_context *ctx)
+{
+   int i;
+
+   for (i = 0; i < ctx->Const.MaxImageUnits; ++i) {
+      struct gl_image_unit *u = &ctx->ImageUnits[i];
+      u->_Valid = validate_image_unit(ctx, u);
+   }
+}
+
 static GLboolean
 validate_bind_image_texture(struct gl_context *ctx, GLuint unit,
                             GLuint texture, GLint level, GLboolean layered,
diff --git a/src/mesa/main/shaderimage.h b/src/mesa/main/shaderimage.h
index f9d550b..aaecc5d 100644
--- a/src/mesa/main/shaderimage.h
+++ b/src/mesa/main/shaderimage.h
@@ -31,6 +31,15 @@
 
 struct gl_context;
 
+/**
+ * Recalculate the \c _Valid flag of a context's shader image units.
+ *
+ * To be called when the state of any texture bound to an image unit
+ * changes.
+ */
+void
+_mesa_validate_image_units(struct gl_context *ctx);
+
 void GLAPIENTRY
 _mesa_BindImageTexture(GLuint unit, GLuint texture, GLint level,
                        GLboolean layered, GLint layer, GLenum access,
diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index ad80dcf..7720965 100644
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -35,6 +35,7 @@
 #include "context.h"
 #include "enums.h"
 #include "macros.h"
+#include "shaderimage.h"
 #include "texobj.h"
 #include "teximage.h"
 #include "texstate.h"
@@ -674,6 +675,8 @@ update_texture_state( struct gl_context *ctx )
 
    if (!fprog || !vprog)
       update_texgen(ctx);
+
+   _mesa_validate_image_units(ctx);
 }
 
 
-- 
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