From dcaec739ea509bddaacc1e6fc037e540f14fccc3 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Tue, 12 Jul 2011 10:57:51 -0700
Subject: [PATCH] i915: Make stencil test for no-stencil handling match depth
 test.

i915_update_draw_buffers() already handles the fallback bit for
missing stencil region, so here we just need to handle whether the GL
thinks we have stencil data or not (and disable the test if so).
(cherry picked from commit 79fee3a76b7f4f63d01266fc3a3cd6ca44d1e513)
---
 src/mesa/drivers/dri/i915/i915_state.c | 32 +++++++++-----------------
 src/mesa/drivers/dri/i915/i915_vtbl.c  |  3 +--
 2 files changed, 12 insertions(+), 23 deletions(-)

diff --git a/src/mesa/drivers/dri/i915/i915_state.c b/src/mesa/drivers/dri/i915/i915_state.c
index 73dda65261e..b876717f12a 100644
--- a/src/mesa/drivers/dri/i915/i915_state.c
+++ b/src/mesa/drivers/dri/i915/i915_state.c
@@ -843,27 +843,17 @@ i915Enable(struct gl_context * ctx, GLenum cap, GLboolean state)
       break;
 
    case GL_STENCIL_TEST:
-      {
-         GLboolean hw_stencil = GL_FALSE;
-         if (ctx->DrawBuffer) {
-            struct intel_renderbuffer *irbStencil
-               = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_STENCIL);
-            hw_stencil = (irbStencil && irbStencil->region);
-         }
-         if (hw_stencil) {
-	    dw = i915->state.Ctx[I915_CTXREG_LIS5];
-            if (state)
-               dw |= (S5_STENCIL_TEST_ENABLE | S5_STENCIL_WRITE_ENABLE);
-            else
-               dw &= ~(S5_STENCIL_TEST_ENABLE | S5_STENCIL_WRITE_ENABLE);
-	    if (dw != i915->state.Ctx[I915_CTXREG_LIS5]) {
-	       i915->state.Ctx[I915_CTXREG_LIS5] = dw;
-	       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
-	    }
-         }
-         else {
-            FALLBACK(&i915->intel, I915_FALLBACK_STENCIL, state);
-         }
+      if (!ctx->DrawBuffer || !ctx->DrawBuffer->Visual.stencilBits)
+	 state = false;
+
+      dw = i915->state.Ctx[I915_CTXREG_LIS5];
+      if (state)
+	 dw |= (S5_STENCIL_TEST_ENABLE | S5_STENCIL_WRITE_ENABLE);
+      else
+	 dw &= ~(S5_STENCIL_TEST_ENABLE | S5_STENCIL_WRITE_ENABLE);
+      if (dw != i915->state.Ctx[I915_CTXREG_LIS5]) {
+	 i915->state.Ctx[I915_CTXREG_LIS5] = dw;
+	 I915_STATECHANGE(i915, I915_UPLOAD_CTX);
       }
       break;
 
diff --git a/src/mesa/drivers/dri/i915/i915_vtbl.c b/src/mesa/drivers/dri/i915/i915_vtbl.c
index b3b55b2a5d1..33a660201ea 100644
--- a/src/mesa/drivers/dri/i915/i915_vtbl.c
+++ b/src/mesa/drivers/dri/i915/i915_vtbl.c
@@ -801,8 +801,7 @@ i915_update_draw_buffer(struct intel_context *intel)
     * Update depth and stencil test state
     */
    ctx->Driver.Enable(ctx, GL_DEPTH_TEST, ctx->Depth.Test);
-   ctx->Driver.Enable(ctx, GL_STENCIL_TEST,
-		      (ctx->Stencil.Enabled && fb->Visual.stencilBits > 0));
+   ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
 
    intel->vtbl.set_draw_region(intel, colorRegions, depthRegion,
                                fb->_NumColorDrawBuffers);