From 9db66a3f9f745267d7ed20f1d6fde0272bd37949 Mon Sep 17 00:00:00 2001
From: Alan Hourihane <alanh@tungstengraphics.com>
Date: Mon, 10 Jan 2005 19:44:59 +0000
Subject: Fallback on PolygonStipple for CLE266 hardware. Only upload stencil
 configuration when a stencil buffer exists.

---
 src/mesa/drivers/dri/unichrome/via_context.c |  4 +--
 src/mesa/drivers/dri/unichrome/via_context.h | 15 ++++++++++
 src/mesa/drivers/dri/unichrome/via_state.c   | 43 +++++++++++++++++++++++++---
 3 files changed, 55 insertions(+), 7 deletions(-)

diff --git a/src/mesa/drivers/dri/unichrome/via_context.c b/src/mesa/drivers/dri/unichrome/via_context.c
index dde78c2dc90..ee7f7a079af 100644
--- a/src/mesa/drivers/dri/unichrome/via_context.c
+++ b/src/mesa/drivers/dri/unichrome/via_context.c
@@ -54,7 +54,6 @@
 #include "via_tris.h"
 #include "via_ioctl.h"
 #include "via_fb.h"
-#include "via_regs.h"
 
 #include <stdio.h>
 #include "macros.h"
@@ -380,9 +379,8 @@ viaCreateContext(const __GLcontextModes *mesaVis,
        assert(!mesaVis->haveStencilBuffer);
        vmesa->have_hw_stencil = GL_FALSE;
        vmesa->depth_max = (GLfloat)0xffffffff;
-       vmesa->depth_clear_mask = 0;
-       vmesa->ClearDepth = 0xffffffff;
        vmesa->depth_clear_mask = 0xf << 28;
+       vmesa->ClearDepth = 0xffffffff;
        vmesa->polygon_offset_scale = 2.0 / vmesa->depth_max;
        break;
     default:
diff --git a/src/mesa/drivers/dri/unichrome/via_context.h b/src/mesa/drivers/dri/unichrome/via_context.h
index c6b3265b105..4562c9e656d 100644
--- a/src/mesa/drivers/dri/unichrome/via_context.h
+++ b/src/mesa/drivers/dri/unichrome/via_context.h
@@ -41,6 +41,18 @@ typedef struct via_texture_object_t *viaTextureObjectPtr;
 #include "via_tex.h"
 #include "via_common.h"
 
+/* Chip tags.  These are used to group the adapters into
+ * related families.
+ */
+enum VIACHIPTAGS {
+    VIA_UNKNOWN = 0,
+    VIA_CLE266,
+    VIA_KM400,
+    VIA_K8M800,
+    VIA_PM800,
+    VIA_LAST
+};
+
 #define VIA_FALLBACK_TEXTURE           	0x1
 #define VIA_FALLBACK_DRAW_BUFFER       	0x2
 #define VIA_FALLBACK_READ_BUFFER       	0x4
@@ -53,6 +65,7 @@ typedef struct via_texture_object_t *viaTextureObjectPtr;
 #define VIA_FALLBACK_BLEND_FUNC        	0x400
 #define VIA_FALLBACK_USER_DISABLE      	0x800
 #define VIA_FALLBACK_PROJ_TEXTURE      	0x1000
+#define VIA_FALLBACK_STIPPLE		0x2000
 
 #define VIA_DMA_BUFSIZ                  4096
 #define VIA_DMA_HIGHWATER               (VIA_DMA_BUFSIZ - 128)
@@ -284,6 +297,8 @@ struct via_context_t {
    GLuint swap_count;
    GLuint swap_missed_count;
 
+   GLuint stipple[32];
+
    PFNGLXGETUSTPROC get_ust;
 
 };
diff --git a/src/mesa/drivers/dri/unichrome/via_state.c b/src/mesa/drivers/dri/unichrome/via_state.c
index 43430210518..94b32011618 100644
--- a/src/mesa/drivers/dri/unichrome/via_state.c
+++ b/src/mesa/drivers/dri/unichrome/via_state.c
@@ -469,9 +469,8 @@ void viaEmitState(viaContextPtr vmesa)
       }
    }
     
-    
    if (ctx->Polygon.StippleFlag) {
-      GLuint *stipple = &ctx->PolygonStipple[0];
+      GLuint *stipple = &vmesa->stipple[0];
         
       BEGIN_RING(38);
       OUT_RING( HC_HEADER2 );             
@@ -675,7 +674,7 @@ static void viaDrawBuffer(GLcontext *ctx, GLenum mode)
 
     viaXMesaWindowMoved(vmesa);
 
-   /* We want to update the s/w rast state too so that r200SetBuffer()
+   /* We want to update the s/w rast state too so that viaSetBuffer()
     * gets called.
     */
    _swrast_DrawBuffer(ctx, mode);
@@ -758,6 +757,41 @@ static void viaDepthRange(GLcontext *ctx,
     viaCalcViewport(ctx);
 }
 
+#if 0
+static void
+flip_bytes( GLubyte *p, GLuint n )
+{
+   register GLuint i, a, b;
+
+   for (i=0;i<n;i++) {
+      b = (GLuint) p[i];        /* words are often faster than bytes */
+      a = ((b & 0x01) << 7) |
+	  ((b & 0x02) << 5) |
+	  ((b & 0x04) << 3) |
+	  ((b & 0x08) << 1) |
+	  ((b & 0x10) >> 1) |
+	  ((b & 0x20) >> 3) |
+	  ((b & 0x40) >> 5) |
+	  ((b & 0x80) >> 7);
+      p[i] = (GLubyte) a;
+   }
+}
+#endif
+
+static void viaPolygonStipple( GLcontext *ctx, const GLubyte *mask )
+{
+    viaContextPtr vmesa = VIA_CONTEXT(ctx);
+    GLubyte *s = (GLubyte *)vmesa->stipple;
+    int i;
+
+    /* Fallback for the CLE266 case as it doesn't seem to work */
+    if (vmesa->viaScreen->deviceID == VIA_CLE266) {
+   	FALLBACK( vmesa, VIA_FALLBACK_STIPPLE, GL_TRUE);
+    } else {
+    	for (i=0;i<128;i++) 
+       	    s[i] = mask[i];
+    }
+}
 
 void viaInitState(GLcontext *ctx)
 {
@@ -1557,7 +1591,7 @@ void viaValidateState( GLcontext *ctx )
 	viaChooseTriangle(ctx);
     }
 
-    if (vmesa->newState & _NEW_STENCIL)
+    if ((vmesa->newState & _NEW_STENCIL) && vmesa->have_hw_stencil)
         viaChooseStencilState(ctx);
     
     if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
@@ -1600,6 +1634,7 @@ void viaInitStateFuncs(GLcontext *ctx)
     ctx->Driver.DepthRange = viaDepthRange;
     ctx->Driver.Viewport = viaViewport;
     ctx->Driver.Enable = viaEnable;
+    ctx->Driver.PolygonStipple = viaPolygonStipple;
 
     /* Pixel path fallbacks.
      */
-- 
cgit v1.2.3