add the SiS driver - no kernel driver yet

(build tested, but not physically tested)

1 files changed, 954 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/sis/sis_tris.c b/src/mesa/drivers/dri/sis/sis_tris.c
new file mode 100644
index 0000000000..d76431f41d
--- /dev/null
+++ b/src/mesa/drivers/dri/sis/sis_tris.c
@@ -0,0 +1,954 @@
+/* $XFree86*/ /* -*- c-basic-offset: 3 -*- */
+/**************************************************************************
+
+Copyright 2000 Silicon Integrated Systems Corp, Inc., HsinChu, Taiwan.
+Copyright 2003 Eric Anholt
+All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+on the rights to use, copy, modify, merge, publish, distribute, sub
+license, and/or sell copies of the Software, and to permit persons to whom
+the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ATI, PRECISION INSIGHT AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+**************************************************************************/
+
+/*
+ * Authors:
+ *   Sung-Ching Lin <sclin@sis.com.tw>
+ *   Eric Anholt <anholt@FreeBSD.org>
+ */
+
+#include "glheader.h"
+#include "mtypes.h"
+#include "colormac.h"
+#include "macros.h"
+
+#include "swrast/swrast.h"
+#include "swrast_setup/swrast_setup.h"
+#include "tnl/tnl.h"
+#include "tnl/t_context.h"
+#include "tnl/t_pipeline.h"
+
+#include "sis_tris.h"
+#include "sis_state.h"
+#include "sis_vb.h"
+#include "sis_lock.h"
+
+static const GLuint hw_prim[GL_POLYGON+1] = {
+   OP_3D_POINT_DRAW,		/* GL_POINTS */
+   OP_3D_LINE_DRAW,		/* GL_LINES */
+   OP_3D_LINE_DRAW,		/* GL_LINE_LOOP */
+   OP_3D_LINE_DRAW,		/* GL_LINE_STRIP */
+   OP_3D_TRIANGLE_DRAW,		/* GL_TRIANGLES */
+   OP_3D_TRIANGLE_DRAW,		/* GL_TRIANGLE_STRIP */
+   OP_3D_TRIANGLE_DRAW,		/* GL_TRIANGLE_FAN */
+   OP_3D_TRIANGLE_DRAW,		/* GL_QUADS */
+   OP_3D_TRIANGLE_DRAW,		/* GL_QUAD_STRIP */
+   OP_3D_TRIANGLE_DRAW		/* GL_POLYGON */
+};
+
+static const GLuint hw_prim_mmio_fire[OP_3D_TRIANGLE_DRAW+1] = {
+   OP_3D_FIRE_TSARGBa,
+   OP_3D_FIRE_TSARGBb,
+   OP_3D_FIRE_TSARGBc
+};
+
+static const GLuint hw_prim_mmio_shade[OP_3D_TRIANGLE_DRAW+1] = {
+   SHADE_FLAT_VertexA,
+   SHADE_FLAT_VertexB,
+   SHADE_FLAT_VertexC
+};
+
+static const GLuint hw_prim_agp_type[OP_3D_TRIANGLE_DRAW+1] = {
+   MASK_PsPointList,
+   MASK_PsLineList,
+   MASK_PsTriangleList
+};
+
+static const GLuint hw_prim_agp_shade[OP_3D_TRIANGLE_DRAW+1] = {
+   MASK_PsShadingFlatA,
+   MASK_PsShadingFlatB,
+   MASK_PsShadingFlatC
+};
+
+static void sisRasterPrimitive( GLcontext *ctx, GLuint hwprim );
+static void sisRenderPrimitive( GLcontext *ctx, GLenum prim );
+static void sisMakeRoomAGP( sisContextPtr smesa, GLint num );
+static void sisUpdateAGP( sisContextPtr smesa );
+static void sisFireVertsAGP( sisContextPtr smesa );
+
+static float *AGP_StartPtr;
+static float *AGP_WritePtr;		/* Current write position */
+static float *AGP_ReadPtr;		/* Last known engine readposition */
+static long AGP_SpaceLeft;		/* Last known engine readposition */
+
+/***********************************************************************
+ *                    Emit primitives as inline vertices               *
+ ***********************************************************************/
+
+/* Future optimizations:
+ *
+ * The previous code only emitted W when fog or textures were enabled.
+ */
+
+#define SIS_MMIO_WRITE_VERTEX(_v, i, lastvert)			\
+do {								\
+   MMIOBase[(REG_3D_TSXa+(i)*0x30)/4] = _v->v.x;		\
+   MMIOBase[(REG_3D_TSYa+(i)*0x30)/4] = _v->v.y;	        \
+   MMIOBase[(REG_3D_TSZa+(i)*0x30)/4] = _v->v.z;		\
+   MMIOBase[(REG_3D_TSWGa+(i)*0x30)/4] = _v->v.w;		\
+   /*((GLint *) MMIOBase)[(REG_3D_TSFSa+(i)*0x30)/4] = _v->ui[5];*/ \
+   if (SIS_STATES & SIS_VERT_TEX0) {				\
+      MMIOBase[(REG_3D_TSUAa+(i)*0x30)/4] = _v->v.u0;		\
+      MMIOBase[(REG_3D_TSVAa+(i)*0x30)/4] = _v->v.v0;		\
+   }								\
+   if (SIS_STATES & SIS_VERT_TEX1) {				\
+      MMIOBase[(REG_3D_TSUBa+(i)*0x30)/4] = _v->v.u1;		\
+      MMIOBase[(REG_3D_TSVBa+(i)*0x30)/4] = _v->v.v1;		\
+   }								\
+   /*MMIOBase[(REG_3D_TSUCa+(i)*0x30)/4] = _v->v.u2;		\
+   MMIOBase[(REG_3D_TSVCa+(i)*0x30)/4] = _v->v.v2;*/		\
+   /* the ARGB write of the last vertex of the primitive fires the 3d engine*/ \
+   if (lastvert || (SIS_STATES & SIS_VERT_SMOOTH))		\
+      ((GLint *) MMIOBase)[(REG_3D_TSARGBa+(i)*0x30)/4] = _v->ui[4]; \
+} while (0);
+
+#define SIS_AGP_WRITE_VERTEX(_v)				\
+do {								\
+   AGP_WritePtr[0] = _v->v.x;					\
+   AGP_WritePtr[1] = _v->v.y;					\
+   AGP_WritePtr[2] = _v->v.z;					\
+   AGP_WritePtr[3] = _v->v.w;					\
+   ((GLint *)AGP_WritePtr)[4] = _v->ui[4];			\
+   AGP_WritePtr += 5;						\
+   if (SIS_STATES & SIS_VERT_TEX0) {				\
+      AGP_WritePtr[0] = _v->v.u0;				\
+      AGP_WritePtr[1] = _v->v.v0;				\
+      AGP_WritePtr += 2;					\
+   }								\
+   if (SIS_STATES & SIS_VERT_TEX1) {				\
+      AGP_WritePtr[0] = _v->v.u1;				\
+      AGP_WritePtr[1] = _v->v.v1;				\
+      AGP_WritePtr += 2;					\
+   }								\
+} while(0)
+
+#define MMIO_VERT_REG_COUNT 10
+
+#define SIS_VERT_SMOOTH	0x01
+#define SIS_VERT_TEX0	0x02
+#define SIS_VERT_TEX1	0x04
+
+static sis_quad_func sis_quad_func_agp[8];
+static sis_tri_func sis_tri_func_agp[8];
+static sis_line_func sis_line_func_agp[8];
+static sis_point_func sis_point_func_agp[8];
+static sis_quad_func sis_quad_func_mmio[8];
+static sis_tri_func sis_tri_func_mmio[8];
+static sis_line_func sis_line_func_mmio[8];
+static sis_point_func sis_point_func_mmio[8];
+
+/* XXX: These definitions look questionable */
+#define USE_XYZ		MASK_PsVertex_HAS_RHW
+#define USE_W		MASK_PsVertex_HAS_NORMALXYZ
+#define USE_RGB		MASK_PsVertex_HAS_SPECULAR
+#define USE_UV1		MASK_PsVertex_HAS_UVSet2
+#define USE_UV2		MASK_PsVertex_HAS_UVSet3
+
+static GLint AGPParsingValues[8] = {
+  (5 << 28) | USE_XYZ | USE_W | USE_RGB,
+  (5 << 28) | USE_XYZ | USE_W | USE_RGB,
+  (7 << 28) | USE_XYZ | USE_W | USE_RGB | USE_UV1,
+  (7 << 28) | USE_XYZ | USE_W | USE_RGB | USE_UV1,
+  (7 << 28) | USE_XYZ | USE_W | USE_RGB | USE_UV2,
+  (7 << 28) | USE_XYZ | USE_W | USE_RGB | USE_UV2,
+  (9 << 28) | USE_XYZ | USE_W | USE_RGB | USE_UV1 | USE_UV2,
+  (9 << 28) | USE_XYZ | USE_W | USE_RGB | USE_UV1 | USE_UV2,
+};
+
+#define SIS_STATES (0)
+#define TAG(x) x##_none
+#include "sis_tritmp.h"
+
+#define SIS_STATES (SIS_VERT_SMOOTH)
+#define TAG(x) x##_s
+#include "sis_tritmp.h"
+
+#define SIS_STATES (SIS_VERT_TEX0)
+#define TAG(x) x##_t0
+#include "sis_tritmp.h"
+
+#define SIS_STATES (SIS_VERT_SMOOTH | SIS_VERT_TEX0)
+#define TAG(x) x##_st0
+#include "sis_tritmp.h"
+
+#define SIS_STATES (SIS_VERT_TEX1)
+#define TAG(x) x##_t1
+#include "sis_tritmp.h"
+
+#define SIS_STATES (SIS_VERT_SMOOTH | SIS_VERT_TEX1)
+#define TAG(x) x##_st1
+#include "sis_tritmp.h"
+
+#define SIS_STATES (SIS_VERT_TEX0 | SIS_VERT_TEX1)
+#define TAG(x) x##_t0t1
+#include "sis_tritmp.h"
+
+#define SIS_STATES (SIS_VERT_SMOOTH | SIS_VERT_TEX0 | SIS_VERT_TEX1)
+#define TAG(x) x##_st0t1
+#include "sis_tritmp.h"
+
+/***********************************************************************
+ *          Macros for t_dd_tritmp.h to draw basic primitives          *
+ ***********************************************************************/
+
+#define POINT( v0 ) smesa->draw_point( smesa, v0 )
+#define LINE( v0, v1 ) smesa->draw_line( smesa, v0, v1 )
+#define TRI( a, b, c ) smesa->draw_tri( smesa, a, b, c )
+#define QUAD( a, b, c, d ) smesa->draw_quad( smesa, a, b, c, d )
+
+/***********************************************************************
+ *              Build render functions from dd templates               *
+ ***********************************************************************/
+
+#define SIS_OFFSET_BIT		0x01
+#define SIS_TWOSIDE_BIT		0x02
+#define SIS_UNFILLED_BIT	0x04
+#define SIS_FALLBACK_BIT	0x08
+#define SIS_MAX_TRIFUNC		0x10
+
+
+static struct {
+   points_func	        points;
+   line_func		line;
+   triangle_func	triangle;
+   quad_func		quad;
+} rast_tab[SIS_MAX_TRIFUNC];
+
+
+#define DO_FALLBACK (IND & SIS_FALLBACK_BIT)
+#define DO_OFFSET   (IND & SIS_OFFSET_BIT)
+#define DO_UNFILLED (IND & SIS_UNFILLED_BIT)
+#define DO_TWOSIDE  (IND & SIS_TWOSIDE_BIT)
+#define DO_FLAT      0
+#define DO_TRI       1
+#define DO_QUAD      1
+#define DO_LINE      1
+#define DO_POINTS    1
+#define DO_FULL_QUAD 1
+
+#define HAVE_RGBA   1
+#define HAVE_SPEC   1
+#define HAVE_BACK_COLORS  0
+#define HAVE_HW_FLATSHADE 1
+#define VERTEX sisVertex
+#define TAB rast_tab
+
+#define DEPTH_SCALE 1.0
+#define UNFILLED_TRI unfilled_tri
+#define UNFILLED_QUAD unfilled_quad
+#define VERT_X(_v) _v->v.x
+#define VERT_Y(_v) _v->v.y
+#define VERT_Z(_v) _v->v.z
+#define AREA_IS_CCW( a ) (a > 0)
+#define GET_VERTEX(e) (smesa->verts + (e << smesa->vertex_stride_shift))
+
+#define VERT_SET_RGBA( v, c )	\
+	do {			\
+		sis_color_t *vc = (sis_color_t *)&(v)->ui[coloroffset]; \
+		vc->blue  = (c)[2];	\
+		vc->green = (c)[1];	\
+		vc->red   = (c)[0];	\
+		vc->alpha = (c)[3];	\
+	} while (0)
+#define VERT_COPY_RGBA( v0, v1 ) v0->ui[coloroffset] = v1->ui[coloroffset]
+#define VERT_SAVE_RGBA( idx )    color[idx] = v[idx]->ui[coloroffset]
+#define VERT_RESTORE_RGBA( idx ) v[idx]->ui[coloroffset] = color[idx]
+
+#define VERT_SET_SPEC( v0, c )				\
+	if (havespec) {					\
+		(v0)->v.specular.red   = (c)[0];	\
+		(v0)->v.specular.green = (c)[1];	\
+		(v0)->v.specular.blue  = (c)[2];	\
+	}
+#define VERT_COPY_SPEC( v0, v1 )			\
+	if (havespec) {					\
+		(v0)->v.specular.red   = v1->v.specular.red;	\
+		(v0)->v.specular.green = v1->v.specular.green;	\
+		(v0)->v.specular.blue  = v1->v.specular.blue;	\
+	}
+
+#define VERT_SAVE_SPEC( idx )    if (havespec) spec[idx] = v[idx]->ui[5]
+#define VERT_RESTORE_SPEC( idx ) if (havespec) v[idx]->ui[5] = spec[idx]
+
+#define LOCAL_VARS(n)						\
+   sisContextPtr smesa = SIS_CONTEXT(ctx);			\
+   GLuint color[n], spec[n];					\
+   GLuint coloroffset = (smesa->vertex_size == 4 ? 3 : 4);	\
+   GLboolean havespec = (smesa->vertex_size == 4 ? 0 : 1);	\
+   (void) color; (void) spec; (void) coloroffset; (void) havespec;
+
+/***********************************************************************
+ *                Helpers for rendering unfilled primitives            *
+ ***********************************************************************/
+
+#define RASTERIZE(x) if (smesa->hw_primitive != hw_prim[x]) \
+                        sisRasterPrimitive( ctx, hw_prim[x] )
+#define RENDER_PRIMITIVE smesa->render_primitive
+#define IND SIS_FALLBACK_BIT
+#define TAG(x) x
+#include "tnl_dd/t_dd_unfilled.h"
+#undef IND
+
+
+/***********************************************************************
+ *                      Generate GL render functions                   *
+ ***********************************************************************/
+
+
+#define IND (0)
+#define TAG(x) x
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_OFFSET_BIT)
+#define TAG(x) x##_offset
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_TWOSIDE_BIT)
+#define TAG(x) x##_twoside
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_TWOSIDE_BIT | SIS_OFFSET_BIT)
+#define TAG(x) x##_twoside_offset
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_UNFILLED_BIT)
+#define TAG(x) x##_unfilled
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_OFFSET_BIT | SIS_UNFILLED_BIT)
+#define TAG(x) x##_offset_unfilled
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_TWOSIDE_BIT | SIS_UNFILLED_BIT)
+#define TAG(x) x##_twoside_unfilled
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_TWOSIDE_BIT | SIS_OFFSET_BIT | SIS_UNFILLED_BIT)
+#define TAG(x) x##_twoside_offset_unfilled
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_FALLBACK_BIT)
+#define TAG(x) x##_fallback
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_OFFSET_BIT | SIS_FALLBACK_BIT)
+#define TAG(x) x##_offset_fallback
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_TWOSIDE_BIT | SIS_FALLBACK_BIT)
+#define TAG(x) x##_twoside_fallback
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_TWOSIDE_BIT | SIS_OFFSET_BIT | SIS_FALLBACK_BIT)
+#define TAG(x) x##_twoside_offset_fallback
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_UNFILLED_BIT | SIS_FALLBACK_BIT)
+#define TAG(x) x##_unfilled_fallback
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_OFFSET_BIT | SIS_UNFILLED_BIT | SIS_FALLBACK_BIT)
+#define TAG(x) x##_offset_unfilled_fallback
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_TWOSIDE_BIT | SIS_UNFILLED_BIT | SIS_FALLBACK_BIT)
+#define TAG(x) x##_twoside_unfilled_fallback
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (SIS_TWOSIDE_BIT | SIS_OFFSET_BIT | SIS_UNFILLED_BIT |  \
+	     SIS_FALLBACK_BIT)
+#define TAG(x) x##_twoside_offset_unfilled_fallback
+#include "tnl_dd/t_dd_tritmp.h"
+
+
+static void init_rast_tab( void )
+{
+   init();
+   init_offset();
+   init_twoside();
+   init_twoside_offset();
+   init_unfilled();
+   init_offset_unfilled();
+   init_twoside_unfilled();
+   init_twoside_offset_unfilled();
+   init_fallback();
+   init_offset_fallback();
+   init_twoside_fallback();
+   init_twoside_offset_fallback();
+   init_unfilled_fallback();
+   init_offset_unfilled_fallback();
+   init_twoside_unfilled_fallback();
+   init_twoside_offset_unfilled_fallback();
+}
+
+
+
+/***********************************************************************
+ *                    Rasterization fallback helpers                   *
+ ***********************************************************************/
+
+
+/* This code is hit only when a mix of accelerated and unaccelerated
+ * primitives are being drawn, and only for the unaccelerated
+ * primitives.
+ */
+static void
+sis_fallback_quad( sisContextPtr smesa,
+		   sisVertex *v0,
+		   sisVertex *v1,
+		   sisVertex *v2,
+		   sisVertex *v3 )
+{
+   GLcontext *ctx = smesa->glCtx;
+   SWvertex v[4];
+   sis_translate_vertex( ctx, v0, &v[0] );
+   sis_translate_vertex( ctx, v1, &v[1] );
+   sis_translate_vertex( ctx, v2, &v[2] );
+   sis_translate_vertex( ctx, v3, &v[3] );
+   _swrast_Triangle( ctx, &v[0], &v[1], &v[3] );
+   _swrast_Triangle( ctx, &v[1], &v[2], &v[3] );
+}
+
+static void
+sis_fallback_tri( sisContextPtr smesa,
+		  sisVertex *v0,
+		  sisVertex *v1,
+		  sisVertex *v2 )
+{
+   GLcontext *ctx = smesa->glCtx;
+   SWvertex v[3];
+   sis_translate_vertex( ctx, v0, &v[0] );
+   sis_translate_vertex( ctx, v1, &v[1] );
+   sis_translate_vertex( ctx, v2, &v[2] );
+   _swrast_Triangle( ctx, &v[0], &v[1], &v[2] );
+}
+
+
+static void
+sis_fallback_line( sisContextPtr smesa,
+		   sisVertex *v0,
+		   sisVertex *v1 )
+{
+   GLcontext *ctx = smesa->glCtx;
+   SWvertex v[2];
+   sis_translate_vertex( ctx, v0, &v[0] );
+   sis_translate_vertex( ctx, v1, &v[1] );
+   _swrast_Line( ctx, &v[0], &v[1] );
+}
+
+
+static void
+sis_fallback_point( sisContextPtr smesa,
+		    sisVertex *v0 )
+{
+   GLcontext *ctx = smesa->glCtx;
+   SWvertex v[1];
+   sis_translate_vertex( ctx, v0, &v[0] );
+   _swrast_Point( ctx, &v[0] );
+}
+
+
+
+/**********************************************************************/
+/*               Render unclipped begin/end objects                   */
+/**********************************************************************/
+
+#define VERT(x) (sisVertex *)(sisverts + (x << shift))
+#define RENDER_POINTS( start, count )		\
+   for ( ; start < count ; start++)		\
+      smesa->draw_point( smesa, VERT(start) )
+#define RENDER_LINE( v0, v1 ) smesa->draw_line( smesa, VERT(v0), VERT(v1) )
+#define RENDER_TRI( v0, v1, v2 ) smesa->draw_tri( smesa, VERT(v0), VERT(v1), \
+   VERT(v2) )
+#define RENDER_QUAD( v0, v1, v2, v3 ) smesa->draw_quad( smesa, VERT(v0), \
+   VERT(v1), VERT(v2), VERT(v3))
+#define INIT(x) sisRenderPrimitive( ctx, x )
+#undef LOCAL_VARS
+#define LOCAL_VARS				\
+    sisContextPtr smesa = SIS_CONTEXT(ctx);	\
+    const GLuint shift = smesa->vertex_stride_shift;		\
+    const char *sisverts = (char *)smesa->verts;		\
+    const GLuint * const elt = TNL_CONTEXT(ctx)->vb.Elts;	\
+    (void) elt;
+#define RESET_STIPPLE
+#define RESET_OCCLUSION
+#define PRESERVE_VB_DEFS
+#define ELT(x) (x)
+#define TAG(x) sis_##x##_verts
+#include "tnl/t_vb_rendertmp.h"
+#undef ELT
+#undef TAG
+#define TAG(x) sis_##x##_elts
+#define ELT(x) elt[x]
+#include "tnl/t_vb_rendertmp.h"
+
+
+/**********************************************************************/
+/*                    Render clipped primitives                       */
+/**********************************************************************/
+
+static void sisRenderClippedPoly( GLcontext *ctx, const GLuint *elts, GLuint n )
+{
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+
+   /* Render the new vertices as an unclipped polygon.
+    */
+   {
+      GLuint *tmp = VB->Elts;
+      VB->Elts = (GLuint *)elts;
+      tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n, PRIM_BEGIN|PRIM_END );
+      VB->Elts = tmp;
+   }
+}
+
+static void sisRenderClippedLine( GLcontext *ctx, GLuint ii, GLuint jj )
+{
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   tnl->Driver.Render.Line( ctx, ii, jj );
+}
+
+#if 0
+static void sisFastRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
+				      GLuint n )
+{
+   sisContextPtr smesa = SIS_CONTEXT( ctx );
+   GLuint vertsize = smesa->vertex_size;
+   GLuint *vb = r128AllocDmaLow( rmesa, (n-2) * 3 * 4 * vertsize );
+   GLubyte *sisverts = (GLubyte *)smesa->verts;
+   const GLuint shift = smesa->vertex_stride_shift;
+   const GLuint *start = (const GLuint *)VERT(elts[0]);
+   int i,j;
+
+   smesa->num_verts += (n-2) * 3;
+
+   for (i = 2 ; i < n ; i++) {
+      COPY_DWORDS( j, vb, vertsize, (sisVertexPtr) VERT(elts[i-1]) );
+      COPY_DWORDS( j, vb, vertsize, (sisVertexPtr) VERT(elts[i]) );
+      COPY_DWORDS( j, vb, vertsize, (sisVertexPtr) start );
+   }
+}
+#endif
+
+
+
+
+/**********************************************************************/
+/*                    Choose render functions                         */
+/**********************************************************************/
+
+#define _SIS_NEW_RENDER_STATE (_DD_NEW_LINE_STIPPLE |	\
+			          _DD_NEW_LINE_SMOOTH |		\
+			          _DD_NEW_POINT_SMOOTH |	\
+			          _DD_NEW_TRI_SMOOTH |		\
+			          _DD_NEW_TRI_UNFILLED |	\
+			          _DD_NEW_TRI_LIGHT_TWOSIDE |	\
+			          _DD_NEW_TRI_OFFSET)		\
+
+
+#define POINT_FALLBACK (DD_POINT_SMOOTH)
+#define LINE_FALLBACK (DD_LINE_STIPPLE|DD_LINE_SMOOTH)
+#define TRI_FALLBACK (DD_TRI_SMOOTH)
+#define ANY_FALLBACK_FLAGS (POINT_FALLBACK|LINE_FALLBACK|TRI_FALLBACK)
+#define ANY_RASTER_FLAGS (DD_TRI_LIGHT_TWOSIDE|DD_TRI_OFFSET|DD_TRI_UNFILLED)
+
+
+static void sisChooseRenderState(GLcontext *ctx)
+{
+   sisContextPtr smesa = SIS_CONTEXT( ctx );
+   GLuint flags = ctx->_TriangleCaps;
+   GLuint index = 0;
+   GLuint vertindex = 0;
+   
+   if (ctx->Texture.Unit[0]._ReallyEnabled)
+      vertindex |= SIS_VERT_TEX0;
+   if (ctx->Texture.Unit[1]._ReallyEnabled)
+      vertindex |= SIS_VERT_TEX1;
+   if (ctx->Light.ShadeModel == GL_SMOOTH)
+      vertindex |= SIS_VERT_SMOOTH;
+
+   if (smesa->AGPCmdModeEnabled) {
+      smesa->draw_quad = sis_quad_func_agp[vertindex];
+      smesa->draw_tri = sis_tri_func_agp[vertindex];
+      smesa->draw_line = sis_line_func_agp[vertindex];
+      smesa->draw_point = sis_point_func_agp[vertindex];
+   } else {
+      smesa->draw_quad = sis_quad_func_mmio[vertindex];
+      smesa->draw_tri = sis_tri_func_mmio[vertindex];
+      smesa->draw_line = sis_line_func_mmio[vertindex];
+      smesa->draw_point = sis_point_func_mmio[vertindex];
+   }
+   smesa->AGPParseSet &= ~(MASK_VertexDWSize | MASK_VertexDataFormat);
+   smesa->AGPParseSet |= AGPParsingValues[vertindex];
+
+   if (flags & (ANY_RASTER_FLAGS|ANY_FALLBACK_FLAGS)) {
+
+      if (flags & ANY_RASTER_FLAGS) {
+	 if (flags & DD_TRI_LIGHT_TWOSIDE) index |= SIS_TWOSIDE_BIT;
+	 if (flags & DD_TRI_OFFSET)        index |= SIS_OFFSET_BIT;
+	 if (flags & DD_TRI_UNFILLED)      index |= SIS_UNFILLED_BIT;
+      }
+
+      /* Hook in fallbacks for specific primitives.
+       */
+      if (flags & ANY_FALLBACK_FLAGS) {
+	 if (flags & POINT_FALLBACK)
+            smesa->draw_point = sis_fallback_point;
+	 if (flags & LINE_FALLBACK)
+            smesa->draw_line = sis_fallback_line;
+	 if (flags & TRI_FALLBACK) {
+            smesa->draw_quad = sis_fallback_quad;
+            smesa->draw_tri = sis_fallback_tri;
+         }
+	 index |= SIS_FALLBACK_BIT;
+      }
+   }
+
+   if (index != smesa->RenderIndex) {
+      TNLcontext *tnl = TNL_CONTEXT(ctx);
+      tnl->Driver.Render.Points = rast_tab[index].points;
+      tnl->Driver.Render.Line = rast_tab[index].line;
+      tnl->Driver.Render.Triangle = rast_tab[index].triangle;
+      tnl->Driver.Render.Quad = rast_tab[index].quad;
+
+      if (index == 0) {
+	 tnl->Driver.Render.PrimTabVerts = sis_render_tab_verts;
+	 tnl->Driver.Render.PrimTabElts = sis_render_tab_elts;
+	 tnl->Driver.Render.ClippedLine = rast_tab[index].line;
+         /*XXX: sisFastRenderClippedPoly*/
+	 tnl->Driver.Render.ClippedPolygon = sisRenderClippedPoly;
+      } else {
+	 tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
+	 tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
+	 tnl->Driver.Render.ClippedLine = sisRenderClippedLine;
+	 tnl->Driver.Render.ClippedPolygon = sisRenderClippedPoly;
+      }
+
+      smesa->RenderIndex = index;
+   }
+}
+
+/**********************************************************************/
+/*                Multipass rendering for front buffering             */
+/**********************************************************************/
+static GLboolean multipass_cliprect( GLcontext *ctx, GLuint pass )
+{
+   sisContextPtr smesa = SIS_CONTEXT( ctx );
+
+   if (pass >= smesa->driDrawable->numClipRects) {
+      return GL_FALSE;
+   } else {
+      GLint x1, y1, x2, y2;
+
+      x1 = smesa->driDrawable->pClipRects[pass].x1 - smesa->driDrawable->x;
+      y1 = smesa->driDrawable->pClipRects[pass].y1 - smesa->driDrawable->y;
+      x2 = smesa->driDrawable->pClipRects[pass].x2 - smesa->driDrawable->x;
+      y2 = smesa->driDrawable->pClipRects[pass].y2 - smesa->driDrawable->y;
+
+      if (ctx->Scissor.Enabled) {
+         GLint scisy1 = Y_FLIP(ctx->Scissor.Y + ctx->Scissor.Height - 1);
+         GLint scisy2 = Y_FLIP(ctx->Scissor.Y);
+
+         if (ctx->Scissor.X > x1)
+            x1 = ctx->Scissor.X;
+         if (scisy1 > y1)
+            y1 = scisy1;
+         if (ctx->Scissor.X + ctx->Scissor.Width - 1 < x2)
+            x2 = ctx->Scissor.X + ctx->Scissor.Width - 1;
+         if (scisy2 < y2)
+            y2 = scisy2;
+      }
+
+      MMIO(REG_3D_ClipTopBottom, y1 << 13 | y2);
+      MMIO(REG_3D_ClipLeftRight, x1 << 13 | x2);
+      /* Mark that we clobbered these registers */
+      smesa->GlobalFlag |= GFLAG_CLIPPING;
+      return GL_TRUE;
+   }
+}
+
+
+
+/**********************************************************************/
+/*                 Validate state at pipeline start                   */
+/**********************************************************************/
+
+static void sisRunPipeline( GLcontext *ctx )
+{
+   sisContextPtr smesa = SIS_CONTEXT( ctx );
+
+   LOCK_HARDWARE();
+   sisUpdateHWState( ctx );
+
+   if (smesa->AGPCmdModeEnabled) {
+      AGP_WritePtr = (GLfloat *)smesa->AGPCmdBufBase + *smesa->pAGPCmdBufNext;
+      AGP_StartPtr = AGP_WritePtr;
+      AGP_ReadPtr = (GLfloat *)((long)MMIO_READ(REG_3D_AGPCmBase) -
+         (long)smesa->AGPCmdBufAddr + (long)smesa->AGPCmdBufBase);
+      sisUpdateAGP( smesa );
+   }
+
+   if (!smesa->Fallback && smesa->NewGLState) {
+      if (smesa->NewGLState & _SIS_NEW_VERTEX_STATE)
+	 sisChooseVertexState( ctx );
+
+      if (smesa->NewGLState & (_SIS_NEW_RENDER_STATE | _NEW_TEXTURE))
+	 sisChooseRenderState( ctx );
+
+      smesa->NewGLState = 0;
+   }
+
+   _tnl_run_pipeline( ctx );
+
+   if (smesa->AGPCmdModeEnabled)
+      sisFireVertsAGP( smesa );
+   else
+      mEndPrimitive();
+   UNLOCK_HARDWARE();
+}
+
+/**********************************************************************/
+/*                 High level hooks for t_vb_render.c                 */
+/**********************************************************************/
+
+/* This is called when Mesa switches between rendering triangle
+ * primitives (such as GL_POLYGON, GL_QUADS, GL_TRIANGLE_STRIP, etc),
+ * and lines, points and bitmaps.
+ */
+
+static void sisRasterPrimitive( GLcontext *ctx, GLuint hwprim )
+{
+   sisContextPtr smesa = SIS_CONTEXT(ctx);
+   if (smesa->hw_primitive != hwprim) {
+      if (smesa->AGPCmdModeEnabled) {
+         sisFireVertsAGP( smesa );
+         smesa->AGPParseSet &= ~(MASK_PsDataType | MASK_PsShadingMode);
+         smesa->AGPParseSet |= hw_prim_agp_type[hwprim];
+         if (ctx->Light.ShadeModel == GL_FLAT)
+            smesa->AGPParseSet |= hw_prim_agp_shade[hwprim];
+         else
+            smesa->AGPParseSet |= MASK_PsShadingSmooth;
+      } else {
+         mEndPrimitive();
+         smesa->dwPrimitiveSet &= ~(MASK_DrawPrimitiveCommand | 
+            MASK_SetFirePosition | MASK_ShadingMode);
+         smesa->dwPrimitiveSet |= hwprim | hw_prim_mmio_fire[hwprim];
+         if (ctx->Light.ShadeModel == GL_FLAT)
+            smesa->dwPrimitiveSet |= hw_prim_mmio_shade[hwprim];
+         else
+            smesa->dwPrimitiveSet |= SHADE_GOURAUD;
+      }
+   }
+   smesa->hw_primitive = hwprim;
+}
+
+static void sisRenderPrimitive( GLcontext *ctx, GLenum prim )
+{
+   sisContextPtr smesa = SIS_CONTEXT(ctx);
+
+   smesa->render_primitive = prim;
+   if (prim >= GL_TRIANGLES && (ctx->_TriangleCaps & DD_TRI_UNFILLED))
+      return;
+   sisRasterPrimitive( ctx, hw_prim[prim] );
+}
+
+
+static void sisRenderStart( GLcontext *ctx )
+{
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   sisContextPtr smesa = SIS_CONTEXT(ctx);
+
+   /* Check for projective texturing.  Make sure all texcoord
+    * pointers point to something.  (fix in mesa?)
+    */
+   sisCheckTexSizes( ctx );
+
+   if (ctx->Color._DrawDestMask == FRONT_LEFT_BIT && 
+      smesa->driDrawable->numClipRects != 0)
+   {
+      multipass_cliprect(ctx, 0);
+      if (smesa->driDrawable->numClipRects > 1)
+         tnl->Driver.Render.Multipass = multipass_cliprect;
+      else
+         tnl->Driver.Render.Multipass = NULL;
+   } else {
+      tnl->Driver.Render.Multipass = NULL;
+   }
+}
+
+static void sisRenderFinish( GLcontext *ctx )
+{
+}
+
+/* Update SpaceLeft after an engine or current write pointer update */
+static void sisUpdateAGP( sisContextPtr smesa )
+{
+   /* ReadPtr == WritePtr is the empty case */
+   if (AGP_ReadPtr <= AGP_WritePtr)
+      AGP_SpaceLeft = (long)smesa->AGPCmdBufBase + (long)smesa->AGPCmdBufSize - 
+         (long)AGP_WritePtr;
+   else
+      AGP_SpaceLeft = AGP_ReadPtr - AGP_WritePtr - 4;
+}
+
+/* Fires a set of vertices that have been written from AGP_StartPtr to
+ * AGP_WritePtr, using the smesa->AGPParseSet format.
+ */
+void
+sisFireVertsAGP( sisContextPtr smesa )
+{
+   if (AGP_WritePtr == AGP_StartPtr)
+      return;
+
+   mWait3DCmdQueue(5);
+   mEndPrimitive();
+   MMIO(REG_3D_AGPCmBase, (long)AGP_StartPtr - (long)smesa->AGPCmdBufBase +
+      (long)smesa->AGPCmdBufAddr);
+   MMIO(REG_3D_AGPTtDwNum, (((long)AGP_WritePtr - (long)AGP_StartPtr) >> 2) |
+      0x50000000);
+   MMIO(REG_3D_ParsingSet, smesa->AGPParseSet);
+   
+   MMIO(REG_3D_AGPCmFire, (GLint)(-1));
+   mEndPrimitive();
+
+   *(smesa->pAGPCmdBufNext) = (((long)AGP_WritePtr -
+      (long)smesa->AGPCmdBufBase) + 0xf) & ~0xf;
+   AGP_StartPtr = AGP_WritePtr;
+   sisUpdateAGP( smesa );
+}
+
+/* Make sure there are more than num dwords left in the AGP queue. */
+static void
+sisMakeRoomAGP( sisContextPtr smesa, GLint num )
+{
+   int size = num * 4;
+   
+   if (size <= AGP_SpaceLeft) {
+      AGP_SpaceLeft -= size;
+      return;
+   }
+   /* Wrapping */
+   if (AGP_WritePtr + num > (GLfloat *)(smesa->AGPCmdBufBase +
+      smesa->AGPCmdBufSize))
+   {
+      sisFireVertsAGP( smesa );
+      AGP_WritePtr = (GLfloat *)smesa->AGPCmdBufBase;
+      AGP_StartPtr = AGP_WritePtr;
+      sisUpdateAGP( smesa );
+      WaitEngIdle( smesa ); /* XXX Why is this necessary? */
+   }
+
+   if (size > AGP_SpaceLeft) {
+      /* Update the cached engine read pointer */
+      AGP_ReadPtr = (GLfloat *)((long)MMIO_READ(REG_3D_AGPCmBase) -
+         (long)smesa->AGPCmdBufAddr + (long)smesa->AGPCmdBufBase);
+      sisUpdateAGP( smesa );
+      while (size > AGP_SpaceLeft) {
+         /* Spin until space is available. */
+         usleep(1);
+         AGP_ReadPtr = (GLfloat *)((long)MMIO_READ(REG_3D_AGPCmBase) -
+            (long)smesa->AGPCmdBufAddr + (long)smesa->AGPCmdBufBase);
+         sisUpdateAGP( smesa );
+      }
+   }
+   AGP_SpaceLeft -= size;
+}
+
+/**********************************************************************/
+/*           Transition to/from hardware rasterization.               */
+/**********************************************************************/
+
+void sisFallback( GLcontext *ctx, GLuint bit, GLboolean mode )
+{
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   sisContextPtr smesa = SIS_CONTEXT(ctx);
+   GLuint oldfallback = smesa->Fallback;
+
+   if (mode) {
+      smesa->Fallback |= bit;
+      if (oldfallback == 0) {
+	 _swsetup_Wakeup( ctx );
+	 smesa->RenderIndex = ~0;
+      }
+   }
+   else {
+      smesa->Fallback &= ~bit;
+      if (oldfallback == bit) {
+	 _swrast_flush( ctx );
+	 tnl->Driver.Render.Start = sisRenderStart;
+	 tnl->Driver.Render.PrimitiveNotify = sisRenderPrimitive;
+	 tnl->Driver.Render.Finish = sisRenderFinish;
+	 tnl->Driver.Render.BuildVertices = sisBuildVertices;
+	 smesa->NewGLState |= (_SIS_NEW_RENDER_STATE|
+			       _SIS_NEW_VERTEX_STATE);
+      }
+   }
+}
+
+
+/**********************************************************************/
+/*                            Initialization.                         */
+/**********************************************************************/
+
+void sisInitTriFuncs( GLcontext *ctx )
+{
+   sisContextPtr smesa = SIS_CONTEXT(ctx);
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   static int firsttime = 1;
+
+   if (firsttime) {
+      init_rast_tab();
+      firsttime = 0;
+
+      sis_vert_init_none();
+      sis_vert_init_s();
+      sis_vert_init_t0();
+      sis_vert_init_st0();
+      sis_vert_init_t1();
+      sis_vert_init_st1();
+      sis_vert_init_t0t1();
+      sis_vert_init_st0t1();
+   }
+
+   tnl->Driver.RunPipeline = sisRunPipeline;
+   tnl->Driver.Render.Start = sisRenderStart;
+   tnl->Driver.Render.Finish = sisRenderFinish;
+   tnl->Driver.Render.PrimitiveNotify = sisRenderPrimitive;
+   tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
+   tnl->Driver.Render.BuildVertices = sisBuildVertices;
+   tnl->Driver.Render.Multipass		= NULL;
+
+   if (getenv("SIS_FORCE_FALLBACK") != NULL)
+      sisFallback(ctx, SIS_FALLBACK_FORCE, 1);
+   else
+      sisFallback(ctx, SIS_FALLBACK_FORCE, 0);
+
+   smesa->RenderIndex = ~0;
+   smesa->NewGLState |= (_SIS_NEW_RENDER_STATE|
+			 _SIS_NEW_VERTEX_STATE);
+}