From 42f916e1507f2a5b3da002936418ffe91925104f Mon Sep 17 00:00:00 2001
From: Ian Romanick <ian.d.romanick@intel.com>
Date: Tue, 5 Nov 2013 21:34:26 -0800
Subject: [PATCH] mesa: Refactor depth range setting even more

Create an internal function that just writes data into the depth range.
In future patches this will see more use because we only want to call
dd_function_table::DepthRange once after setting all of the depth ranges
instead of once per depth range.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
---
 src/mesa/main/viewport.c | 57 ++++++++++++++++++++++++++--------------
 src/mesa/main/viewport.h |  3 +++
 2 files changed, 41 insertions(+), 19 deletions(-)

diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c
index d4b03936610..2c81af70d41 100644
--- a/src/mesa/main/viewport.c
+++ b/src/mesa/main/viewport.c
@@ -108,6 +108,43 @@ _mesa_set_viewport(struct gl_context *ctx, unsigned idx, GLint x, GLint y,
    }
 }
 
+static void
+set_depth_range_no_notify(struct gl_context *ctx, unsigned idx,
+                          GLclampd nearval, GLclampd farval)
+{
+   if (ctx->ViewportArray[idx].Near == nearval &&
+       ctx->ViewportArray[idx].Far == farval)
+      return;
+
+   ctx->ViewportArray[idx].Near = CLAMP(nearval, 0.0, 1.0);
+   ctx->ViewportArray[idx].Far = CLAMP(farval, 0.0, 1.0);
+   ctx->NewState |= _NEW_VIEWPORT;
+
+#if 1
+   /* XXX remove this someday.  Currently the DRI drivers rely on
+    * the WindowMap matrix being up to date in the driver's Viewport
+    * and DepthRange functions.
+    */
+   _math_matrix_viewport(&ctx->ViewportArray[idx]._WindowMap,
+                         ctx->ViewportArray[idx].X,
+                         ctx->ViewportArray[idx].Y,
+                         ctx->ViewportArray[idx].Width,
+                         ctx->ViewportArray[idx].Height,
+                         ctx->ViewportArray[idx].Near,
+                         ctx->ViewportArray[idx].Far,
+                         ctx->DrawBuffer->_DepthMaxF);
+#endif
+}
+
+void
+_mesa_set_depth_range(struct gl_context *ctx, unsigned idx,
+                      GLclampd nearval, GLclampd farval)
+{
+   set_depth_range_no_notify(ctx, idx, nearval, farval);
+
+   if (ctx->Driver.DepthRange)
+      ctx->Driver.DepthRange(ctx);
+}
 
 /**
  * Called by glDepthRange
@@ -127,25 +164,7 @@ _mesa_DepthRange(GLclampd nearval, GLclampd farval)
    if (MESA_VERBOSE&VERBOSE_API)
       _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
 
-   if (ctx->ViewportArray[0].Near == nearval &&
-       ctx->ViewportArray[0].Far == farval)
-      return;
-
-   ctx->ViewportArray[0].Near = CLAMP(nearval, 0.0, 1.0);
-   ctx->ViewportArray[0].Far = CLAMP(farval, 0.0, 1.0);
-   ctx->NewState |= _NEW_VIEWPORT;
-
-#if 1
-   /* XXX remove this someday.  Currently the DRI drivers rely on
-    * the WindowMap matrix being up to date in the driver's Viewport
-    * and DepthRange functions.
-    */
-   _math_matrix_viewport(&ctx->ViewportArray[0]._WindowMap,
-                         ctx->ViewportArray[0].X, ctx->ViewportArray[0].Y,
-                         ctx->ViewportArray[0].Width, ctx->ViewportArray[0].Height,
-                         ctx->ViewportArray[0].Near, ctx->ViewportArray[0].Far,
-                         ctx->DrawBuffer->_DepthMaxF);
-#endif
+   set_depth_range_no_notify(ctx, 0, nearval, farval);
 
    if (ctx->Driver.DepthRange) {
       ctx->Driver.DepthRange(ctx);
diff --git a/src/mesa/main/viewport.h b/src/mesa/main/viewport.h
index b4eb5217cd1..44bca1b3a1a 100644
--- a/src/mesa/main/viewport.h
+++ b/src/mesa/main/viewport.h
@@ -46,6 +46,9 @@ _mesa_DepthRange(GLclampd nearval, GLclampd farval);
 extern void GLAPIENTRY
 _mesa_DepthRangef(GLclampf nearval, GLclampf farval);
 
+extern void
+_mesa_set_depth_range(struct gl_context *ctx, unsigned idx,
+                      GLclampd nearval, GLclampd farval);
 
 extern void 
 _mesa_init_viewport(struct gl_context *ctx);
-- 
2.30.2