From 1e1aac034c986a08248861363c0baa27dc2ae2d5 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Mon, 13 Nov 2000 20:02:56 +0000
Subject: Cleanup of derived state calculation prior to seperating software T&L
 into a new directory.  Specifically the handling of changes to lighting
 lighting space (light in model vs. light in eye) have been revamped.

Moved several derived values used only by swrast into that directory.

Removed direct calls to swrast_flush() from vbrender.c -- pushed into
ctx->Driver.RenderFinish.

Optimized flat-shading case in swrast_setup.
---
 src/mesa/swrast/s_context.c | 74 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 72 insertions(+), 2 deletions(-)

(limited to 'src/mesa/swrast/s_context.c')

diff --git a/src/mesa/swrast/s_context.c b/src/mesa/swrast/s_context.c
index ca6b05c486..f1dfef3cc4 100644
--- a/src/mesa/swrast/s_context.c
+++ b/src/mesa/swrast/s_context.c
@@ -1,4 +1,4 @@
-/* $Id: s_context.c,v 1.3 2000/11/10 17:45:16 brianp Exp $ */
+/* $Id: s_context.c,v 1.4 2000/11/13 20:02:57 keithw Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -114,6 +114,44 @@ _swrast_update_rasterflags( GLcontext *ctx )
 }
 
 
+static void
+_swrast_update_polygon( GLcontext *ctx )
+{
+   GLfloat backface_sign = 1;
+
+   if (ctx->Polygon.CullFlag) {
+      backface_sign = 1;
+      switch(ctx->Polygon.CullFaceMode) {
+      case GL_BACK:
+	 if(ctx->Polygon.FrontFace==GL_CCW)
+	    backface_sign = -1;
+	 break;
+      case GL_FRONT:
+	 if(ctx->Polygon.FrontFace!=GL_CCW)
+	    backface_sign = -1;
+	 break;
+      default:
+      case GL_FRONT_AND_BACK:
+	 backface_sign = 0;
+	 break;
+      }
+   }
+   else {
+      backface_sign = 0;
+   }
+
+   SWRAST_CONTEXT(ctx)->_backface_sign = backface_sign;
+}
+
+
+static void
+_swrast_update_hint( GLcontext *ctx )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);   
+   swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
+			      (ctx->Hint.Fog == GL_NICEST && 
+			       swrast->AllowPixelFog));
+}
 
 #define _SWRAST_NEW_TRIANGLE (_NEW_RENDERMODE|		\
                               _NEW_POLYGON|		\
@@ -282,7 +320,17 @@ _swrast_validate_derived( GLcontext *ctx )
    if (swrast->NewState) 
    {
       if (swrast->NewState & _SWRAST_NEW_RASTERMASK) 
-	 _swrast_update_rasterflags( ctx );
+ 	 _swrast_update_rasterflags( ctx );
+
+      if (swrast->NewState & _NEW_TEXTURE)
+	 swrast->_MultiTextureEnabled = (ctx->Texture._ReallyEnabled & 
+					 ~ENABLE_TEX0);
+
+      if (swrast->NewState & _NEW_POLYGON)
+	 _swrast_update_polygon( ctx );
+
+      if (swrast->NewState & _NEW_HINT)
+	 _swrast_update_hint( ctx );
 
       swrast->NewState = 0;
       swrast->StateChanges = 0;
@@ -332,6 +380,20 @@ _swrast_get_stipple_counter_ref( GLcontext *ctx )
    return &SWRAST_CONTEXT(ctx)->StippleCounter;
 }
 
+void 
+_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
+{
+   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
+   SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
+}
+
+void 
+_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
+{
+   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
+   SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
+}
+
 
 GLboolean
 _swrast_CreateContext( GLcontext *ctx )
@@ -366,6 +428,14 @@ _swrast_CreateContext( GLcontext *ctx )
    swrast->InvalidateState = _swrast_sleep;
    swrast->BlendFunc = _swrast_validate_blend_func;
 
+   swrast->AllowVertexFog = GL_TRUE;
+   swrast->AllowPixelFog = GL_TRUE;
+
+   /* Optimized Accum buffer */
+   swrast->_IntegerAccumMode = GL_TRUE;
+   swrast->_IntegerAccumScaler = 0.0;
+
+
    for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
       swrast->TextureSample[i] = _swrast_validate_texture_sample;
    
-- 
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