patch to import Jon Smirl's work from Bitkeeper

1 files changed, 989 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/radeon/radeon_subset_vtx.c b/src/mesa/drivers/dri/radeon/radeon_subset_vtx.c
new file mode 100644
index 0000000000..aa6ec73d5b
--- /dev/null
+++ b/src/mesa/drivers/dri/radeon/radeon_subset_vtx.c
@@ -0,0 +1,989 @@
+/**
+ * \file radeon_subset_vtx.c
+ * \brief Vertex buffering.
+ *
+ * \author Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+/*
+ * Copyright 2000, 2001 ATI Technologies Inc., Ontario, Canada, and
+ *                      Tungsten Graphics Inc., Cedar Park, Texas.
+ * 
+ * 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, TUNGSTEN GRAPHICS 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.
+ * 
+ */
+
+/* $XFree86$ */
+
+#include "glheader.h"
+#include "imports.h"
+#include "api_noop.h"
+#include "context.h"
+/*#include "mmath.h" */
+#include "mtypes.h"
+#include "enums.h"
+#include "glapi.h"
+#include "colormac.h"
+#include "state.h"
+
+#include "radeon_context.h"
+#include "radeon_state.h"
+#include "radeon_ioctl.h"
+#include "radeon_subset.h"
+
+/**
+ * \brief Union for vertex data.
+ */
+union vertex_dword { 
+	float f; /**< \brief floating point value */
+	int i;   /**< \brief integer point value */
+};
+
+
+/**
+ * \brief Maximum number of dwords per vertex.
+ *
+ * Defined as 10 to hold: \code xyzw rgba st \endcode
+ */
+#define MAX_VERTEX_DWORDS 10
+
+
+/**
+ * \brief Global vertex buffer data.
+ */
+static struct vb_t {
+   /**
+    * \brief Notification mechanism.  
+    *
+    * These are treated as a stack to allow us to do things like build quads in
+    * temporary storage and then emit them as triangles.
+    */
+   struct {
+      GLint vertspace;         /**< \brief free vertices count */
+      GLint initial_vertspace; /**< \brief total vertices count */
+      GLint *dmaptr;           /**< \brief */
+      void (*notify)( void );  /**< \brief notification callback */
+   } stack[2];
+
+   /**
+    * \brief Storage for current vertex.
+    */
+   union vertex_dword vertex[MAX_VERTEX_DWORDS];
+
+   /**
+    * \brief Temporary storage for quads, etc.
+    */
+   union vertex_dword vertex_store[MAX_VERTEX_DWORDS * 4];
+
+   /**
+    * \name Color/texture
+    *
+    * Pointers to either vertex or ctx->Current.Attrib, depending on whether
+    * color/texture participates in the current vertex.
+    */
+   /*@{*/
+   GLfloat *floatcolorptr; /**< \brief color */
+   GLfloat *texcoordptr;   /**< \brief texture */
+   /*@}*/
+
+   /**
+    * \brief Pointer to the GL context.
+    */
+   GLcontext *context;
+
+   /**
+    * \brief Active primitive.
+    *
+    * \note May differ from ctx->Driver.CurrentExecPrimitive.
+    */
+   /*@{*/
+   GLenum prim;          /**< \brief primitive */
+   GLuint vertex_format; /**< \brief vertex format */
+   GLint vertex_size;    /**< \brief vertex size */
+   GLboolean recheck;    /**< \brief set if it's needed to validate this information */
+   /*@}*/
+} vb;
+
+
+static void radeonFlushVertices( GLcontext *, GLuint );
+
+
+/**
+ * \brief Primitive information table.
+ */
+static struct prims_t { 
+   int start,  /**< \brief vertex count for the starting primitive */
+       incr,   /**< \brief vertex increment for a further primitive */
+       hwprim; /**< \brief hardware primitive */
+} prims[10] = {
+   { 1, 1, RADEON_CP_VC_CNTL_PRIM_TYPE_POINT },
+   { 2, 2, RADEON_CP_VC_CNTL_PRIM_TYPE_LINE }, 
+   { 2, 1, RADEON_CP_VC_CNTL_PRIM_TYPE_LINE_STRIP },
+   { 2, 1, RADEON_CP_VC_CNTL_PRIM_TYPE_LINE_STRIP },
+   { 3, 3, RADEON_CP_VC_CNTL_PRIM_TYPE_TRI_LIST },
+   { 3, 1, RADEON_CP_VC_CNTL_PRIM_TYPE_TRI_STRIP },
+   { 3, 1, RADEON_CP_VC_CNTL_PRIM_TYPE_TRI_FAN }, 
+   { 4, 4, RADEON_CP_VC_CNTL_PRIM_TYPE_TRI_LIST },
+   { 4, 2, RADEON_CP_VC_CNTL_PRIM_TYPE_TRI_STRIP }, 
+   { 3, 1, RADEON_CP_VC_CNTL_PRIM_TYPE_TRI_FAN }, 
+};
+
+
+/**
+ * \brief Finish the primitive in the vertex buffer.
+ *
+ * \param rmesa Radeon context.
+ *
+ * Truncates any redundant vertices off the end of the buffer, emit the
+ * remaining vertices and advances the current DMA region.
+ */
+static void finish_prim( radeonContextPtr rmesa )
+{
+   GLuint prim_end = vb.stack[0].initial_vertspace - vb.stack[0].vertspace;
+   
+   /* Too few vertices? (eg: 2 vertices for a triangles prim?)
+    */
+   if (prim_end < prims[vb.prim].start) 
+      return;
+
+   /* Drop redundant vertices off end of primitive.  (eg: 5 vertices
+    * for triangles prim?)
+    */
+   prim_end -= (prim_end - prims[vb.prim].start) % prims[vb.prim].incr;
+
+   radeonEmitVertexAOS( rmesa, vb.vertex_size, GET_START(&rmesa->dma.current) );
+
+   radeonEmitVbufPrim( rmesa, vb.vertex_format,
+		       prims[vb.prim].hwprim | rmesa->tcl.tcl_flag, 
+		       prim_end );
+
+   rmesa->dma.current.ptr = 
+      rmesa->dma.current.start += prim_end * vb.vertex_size * 4; 
+}
+
+
+/**
+ * \brief Copy a vertex from the current DMA region
+ *
+ * \param rmesa Radeon context.
+ * \param n vertex index relative to the current DMA region.
+ * \param dst destination pointer.
+ *
+ * Used internally by copy_dma_verts().
+ */
+static void copy_vertex( radeonContextPtr rmesa, GLuint n, GLfloat *dst )
+{
+   GLuint i;
+   GLfloat *src = (GLfloat *)(rmesa->dma.current.address + 
+			      rmesa->dma.current.ptr + 
+			      n * vb.vertex_size * 4);
+
+   for (i = 0 ; i < vb.vertex_size; i++) 
+      dst[i] = src[i];
+}
+
+
+/**
+ * \brief Copy last vertices from the current DMA buffer to resume in a new buffer.
+ *
+ * \param rmesa Radeon context.
+ * \param tmp destination buffer.
+ *
+ * Takes from the current DMA buffer the last vertices necessary to resume in a
+ * new buffer, according to the current primitive.  Uses internally
+ * copy_vertex() for the vertex copying.
+ * 
+ */
+static GLuint copy_dma_verts( radeonContextPtr rmesa, 
+			      GLfloat (*tmp)[MAX_VERTEX_DWORDS] )
+{
+   GLuint ovf, i;
+   GLuint nr = vb.stack[0].initial_vertspace - vb.stack[0].vertspace;
+
+   switch( vb.prim )
+   {
+   case GL_POINTS:
+      return 0;
+   case GL_LINES:
+      ovf = nr&1;
+      for (i = 0 ; i < ovf ; i++)
+	 copy_vertex( rmesa, nr-ovf+i, tmp[i] );
+      return i;
+   case GL_LINE_STRIP:
+      if (nr == 0) 
+	 return 0;
+      copy_vertex( rmesa, nr-1, tmp[0] );
+      return 1;
+   case GL_LINE_LOOP:
+   case GL_TRIANGLE_FAN:
+   case GL_POLYGON:
+      if (nr == 0) 
+	 return 0;
+      else if (nr == 1) {
+	 copy_vertex( rmesa, 0, tmp[0] );
+	 return 1;
+      } else {
+	 copy_vertex( rmesa, 0, tmp[0] );
+	 copy_vertex( rmesa, nr-1, tmp[1] );
+	 return 2;
+      }
+   case GL_TRIANGLES:
+      ovf = nr % 3;
+      for (i = 0 ; i < ovf ; i++)
+	 copy_vertex( rmesa, nr-ovf+i, tmp[i] );
+      return i;
+   case GL_QUADS:
+      ovf = nr % 4;
+      for (i = 0 ; i < ovf ; i++)
+	 copy_vertex( rmesa, nr-ovf+i, tmp[i] );
+      return i;
+   case GL_TRIANGLE_STRIP:
+   case GL_QUAD_STRIP:
+      ovf = MIN2(nr, 2);
+      for (i = 0 ; i < ovf ; i++)
+	 copy_vertex( rmesa, nr-ovf+i, tmp[i] );
+      return i;
+   default:
+      return 0;
+   }
+}
+
+static void notify_wrap_buffer( void );
+
+/**
+ * \brief Resets the vertex buffer notification mechanism.
+ *
+ * Fills in vb_t::stack with the values from the current DMA region in
+ * radeon_dma::current and sets the notification callback to
+ * notify_wrap_buffer().
+ */
+static void reset_notify( void )
+{
+   radeonContextPtr rmesa = RADEON_CONTEXT( vb.context );
+
+   vb.stack[0].dmaptr = (int *)(rmesa->dma.current.address +
+				rmesa->dma.current.ptr);
+   vb.stack[0].vertspace = ((rmesa->dma.current.end - rmesa->dma.current.ptr) / 
+			    (vb.vertex_size * 4));
+   vb.stack[0].vertspace &= ~1;	/* even numbers only -- avoid tristrip parity */
+   vb.stack[0].initial_vertspace = vb.stack[0].vertspace;
+   vb.stack[0].notify = notify_wrap_buffer;
+}      
+
+/**
+ * \brief Full buffer notification callback.
+ *
+ * Makes a copy of the necessary vertices of the current buffer via
+ * copy_dma_verts(), gets and resets new buffer via radeon and re-emits the
+ * saved vertices.
+ */
+static void notify_wrap_buffer( void )
+{
+   GLcontext *ctx = vb.context;
+   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
+   GLfloat tmp[3][MAX_VERTEX_DWORDS];
+   GLuint i, nrverts = 0;
+
+   /* Copy vertices out of dma:
+    */
+   nrverts = copy_dma_verts( rmesa, tmp );
+   finish_prim( rmesa );
+
+   /* Get new buffer
+    */
+   radeonRefillCurrentDmaRegion( rmesa );
+
+   /* Reset vertspace[0], dmaptr
+    */
+   reset_notify();
+
+   /* Reemit saved vertices
+    */
+   for (i = 0 ; i < nrverts; i++) {
+      memcpy( vb.stack[0].dmaptr, tmp[i], vb.vertex_size * 4 );
+      vb.stack[0].dmaptr += vb.vertex_size;
+      vb.stack[0].vertspace--;
+   }
+}
+
+
+static void notify_noop( void )
+{
+   vb.stack[0].dmaptr = (int *)vb.vertex;
+   vb.stack[0].notify = notify_noop;
+   vb.stack[0].vertspace = 1;
+}
+
+/**
+ * \brief Pop the notification mechanism stack.
+ *
+ * Simply copy the second stack array element into the first.
+ *
+ * \sa vb_t::stack and push_notify().
+ */
+static void pop_notify( void )
+{
+   vb.stack[0] = vb.stack[1];
+}
+
+/**
+ * \brief Push the notification mechanism stack.
+ *
+ * \param notify new notify callback for the stack head.
+ * \param space space available for vertices in \p store.
+ * \param store buffer where to store the vertices.
+ * 
+ * Copy the second stack array element into the first and makes the stack head
+ * use the given resources.
+ * 
+ * \sa vb_t::stack and pop_notify().
+ */
+static void push_notify( void (*notify)( void ), int space, 
+			 union vertex_dword *store )
+{
+   vb.stack[1] = vb.stack[0];
+   vb.stack[0].notify = notify;
+   vb.stack[0].initial_vertspace = space;
+   vb.stack[0].vertspace = space;
+   vb.stack[0].dmaptr = (int *)store;
+}
+
+
+/**
+ * \brief Emit a stored vertex (in vb_t::vertex_store) to DMA.
+ *
+ * \param v vertex index.
+ *
+ * Adds the vertex into the current vertex buffer and calls the notification
+ * callback vb_t::notify().
+ */
+static void emit_vertex( int v )
+{
+   int i, *tmp = (int *)vb.vertex_store + v * vb.vertex_size;
+   
+   for (i = 0 ; i < vb.vertex_size ; i++) 
+      *vb.stack[0].dmaptr++ = *tmp++;
+
+   if (--vb.stack[0].vertspace == 0)
+      vb.stack[0].notify();
+}
+
+
+/**
+ * \brief Emit a quad (in vb_t::vertex_store) to DMA as two triangles.
+ *
+ * \param v0 first vertex index.
+ * \param v1 second vertex index.
+ * \param v2 third vertex index.
+ * \param v3 fourth vertex index.
+ *
+ * Calls emit_vertex() to emit the triangles' vertices.
+ */
+static void emit_quad( int v0, int v1, int v2, int v3 )
+{
+   emit_vertex( v0 ); emit_vertex( v1 ); emit_vertex( v3 );
+   emit_vertex( v1 ); emit_vertex( v2 ); emit_vertex( v3 );
+}
+
+/**
+ * \brief Every fourth vertex in a quad primitive, this is called to emit it.
+ *
+ * Pops the notification stack, calls emit_quad() and pushes the notification
+ * stack again, with itself and the vb_t::vertex_store to process another four
+ * vertices.
+ */
+static void notify_quad( void )
+{
+   pop_notify();
+   emit_quad( 0, 1, 2, 3 ); 
+   push_notify( notify_quad, 4, vb.vertex_store );
+}
+
+static void notify_qstrip1( void );
+
+/**
+ * \brief After the 4th vertex, emit either a quad or a flipped quad each two
+ * vertices.
+ *
+ * Pops the notification stack, calls emit_quad() with the flipped vertices and
+ * pushes the notification stack again, with notify_qstrip1() and the
+ * vb_t::vertex_store to process another two vertices.
+ *
+ * \sa notify_qstrip1().
+ */
+static void notify_qstrip0( void )
+{
+   pop_notify();
+   emit_quad( 0, 1, 3, 2 );
+   push_notify( notify_qstrip1, 2, vb.vertex_store );
+}
+
+/**
+ * \brief After the 4th vertex, emit either a quad or a flipped quad each two
+ * vertices.
+ *
+ * Pops the notification stack, calls emit_quad() with the straight vertices
+ * and pushes the notification stack again, with notify_qstrip0() and the
+ * vb_t::vertex_store to process another two vertices.
+ *
+ * \sa notify_qstrip0().
+ */
+static void notify_qstrip1( void )
+{
+   pop_notify();
+   emit_quad( 2, 3, 1, 0 ); 
+   push_notify( notify_qstrip0, 2, vb.vertex_store + 2*vb.vertex_size );
+}
+
+/**
+ * \brief Emit the saved vertex (but hang on to it for later).
+ *
+ * Continue processing this primitive as a linestrip.
+ *
+ * Pops the notification stack and calls emit_quad with the first vertex.
+ */
+static void notify_lineloop0( void )
+{
+   pop_notify();
+   emit_vertex(0);
+}
+
+/**
+ * \brief Invalidate the current vertex format.
+ *
+ * \param ctx GL context.
+ *
+ * Sets the vb_t::recheck flag.
+ */
+void radeonVtxfmtInvalidate( GLcontext *ctx )
+{
+   vb.recheck = GL_TRUE;
+}
+
+
+/**
+ * \brief Validate the vertex format from the context.
+ *
+ * \param ctx GL context.
+ *
+ * Signals a new primitive and determines the appropriate vertex format and
+ * size. Points vb_t::floatcolorptr and vb_t::texcoordptr to the current vertex
+ * and sets them to the current color and texture attributes.
+ *
+ * Clears the vb_t::recheck flag on exit.
+ */
+static void radeonVtxfmtValidate( GLcontext *ctx )
+{
+   radeonContextPtr rmesa = RADEON_CONTEXT( ctx );
+   GLuint ind = (RADEON_CP_VC_FRMT_Z |
+		 RADEON_CP_VC_FRMT_FPCOLOR | 
+		 RADEON_CP_VC_FRMT_FPALPHA);
+
+   if (ctx->Driver.NeedFlush)
+      ctx->Driver.FlushVertices( ctx, ctx->Driver.NeedFlush );
+
+   if (ctx->Texture.Unit[0]._ReallyEnabled) 
+      ind |= RADEON_CP_VC_FRMT_ST0;
+
+   RADEON_NEWPRIM(rmesa);
+   vb.vertex_format = ind;
+   vb.vertex_size = 3;
+
+   /* Would prefer to use ubyte floats in the vertex:
+    */
+   vb.floatcolorptr = &vb.vertex[vb.vertex_size].f;
+   vb.vertex_size += 4;
+   vb.floatcolorptr[0] = ctx->Current.Attrib[VERT_ATTRIB_COLOR0][0];
+   vb.floatcolorptr[1] = ctx->Current.Attrib[VERT_ATTRIB_COLOR0][1];
+   vb.floatcolorptr[2] = ctx->Current.Attrib[VERT_ATTRIB_COLOR0][2];
+   vb.floatcolorptr[3] = ctx->Current.Attrib[VERT_ATTRIB_COLOR0][3];
+   
+   if (ind & RADEON_CP_VC_FRMT_ST0) {
+      vb.texcoordptr = &vb.vertex[vb.vertex_size].f;
+      vb.vertex_size += 2;
+      vb.texcoordptr[0] = ctx->Current.Attrib[VERT_ATTRIB_TEX0][0];
+      vb.texcoordptr[1] = ctx->Current.Attrib[VERT_ATTRIB_TEX0][1];   
+   } 
+   else
+      vb.texcoordptr = ctx->Current.Attrib[VERT_ATTRIB_TEX0];
+
+   vb.recheck = GL_FALSE;
+   ctx->Driver.NeedFlush = FLUSH_UPDATE_CURRENT;
+}
+
+
+#define RESET_STIPPLE() do {			\
+   RADEON_STATECHANGE( rmesa, lin );		\
+   radeonEmitState( rmesa );			\
+} while (0)
+
+#define AUTO_STIPPLE( mode )  do {		\
+   RADEON_STATECHANGE( rmesa, lin );		\
+   if (mode)					\
+      rmesa->hw.lin.cmd[LIN_RE_LINE_PATTERN] |=	\
+	 RADEON_LINE_PATTERN_AUTO_RESET;	\
+   else						\
+      rmesa->hw.lin.cmd[LIN_RE_LINE_PATTERN] &=	\
+	 ~RADEON_LINE_PATTERN_AUTO_RESET;	\
+   radeonEmitState( rmesa );			\
+} while (0)
+
+
+/**
+ * \brief Process glBegin().
+ *
+ * \param mode primitive.
+ */
+static void radeon_Begin( GLenum mode )
+{
+   GLcontext *ctx = vb.context;
+   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
+   GLuint se_cntl;
+   
+   if (mode > GL_POLYGON) {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glBegin" );
+      return;
+   }
+
+   if (ctx->Driver.CurrentExecPrimitive != GL_POLYGON+1) {
+      _mesa_error( ctx, GL_INVALID_OPERATION, "glBegin" );
+      return;
+   }
+   
+   if (ctx->NewState) 
+      _mesa_update_state( ctx );
+
+   if (rmesa->NewGLState)
+      radeonValidateState( ctx );
+
+   if (vb.recheck) 
+      radeonVtxfmtValidate( ctx );
+
+   /* Do we need to grab a new DMA region for the vertices?
+    */
+   if (rmesa->dma.current.ptr + 12*vb.vertex_size*4 > rmesa->dma.current.end) {
+      RADEON_NEWPRIM( rmesa );
+      radeonRefillCurrentDmaRegion( rmesa );
+   }
+
+   reset_notify();
+   vb.prim = ctx->Driver.CurrentExecPrimitive = mode;
+   se_cntl = rmesa->hw.set.cmd[SET_SE_CNTL] | RADEON_FLAT_SHADE_VTX_LAST;
+
+   if (ctx->Line.StippleFlag && 
+       (mode == GL_LINES || 
+	mode == GL_LINE_LOOP ||
+	mode == GL_LINE_STRIP))
+      RESET_STIPPLE();
+
+   switch( mode ) {
+   case GL_LINES:
+      if (ctx->Line.StippleFlag) 
+	 AUTO_STIPPLE( GL_TRUE );
+      break;
+   case GL_LINE_LOOP:
+      vb.prim = GL_LINE_STRIP;
+      push_notify( notify_lineloop0, 1, vb.vertex_store );
+      break;
+   case GL_QUADS:
+      vb.prim = GL_TRIANGLES;
+      push_notify( notify_quad, 4, vb.vertex_store );
+      break;
+   case GL_QUAD_STRIP:
+      if (ctx->_TriangleCaps & DD_FLATSHADE) {
+	 vb.prim = GL_TRIANGLES;
+	 push_notify( notify_qstrip0, 4, vb.vertex_store );
+      }
+      break;
+   case GL_POLYGON:
+      if (ctx->_TriangleCaps & DD_FLATSHADE)
+	 se_cntl &= ~RADEON_FLAT_SHADE_VTX_LAST;
+      break;
+   default:
+      break;
+   }
+
+   if (se_cntl != rmesa->hw.set.cmd[SET_SE_CNTL]) {
+      RADEON_STATECHANGE( rmesa, set );
+      rmesa->hw.set.cmd[SET_SE_CNTL] = se_cntl;
+   }
+}
+
+
+/**
+ * \brief Process glEnd().
+ *
+ */
+static void radeon_End( void )
+{
+   GLcontext *ctx = vb.context;
+   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
+
+   if (ctx->Driver.CurrentExecPrimitive == GL_POLYGON+1) {
+      _mesa_error( ctx, GL_INVALID_OPERATION, "glEnd" );
+      return;
+   }
+
+   /* Need to finish a line loop?
+    */
+   if (ctx->Driver.CurrentExecPrimitive == GL_LINE_LOOP) 
+      emit_vertex( 0 );
+
+   /* Need to pop off quads/quadstrip/etc notification?
+    */
+   if (vb.stack[0].notify != notify_wrap_buffer)
+      pop_notify();
+
+   finish_prim( rmesa );
+
+   if (ctx->Driver.CurrentExecPrimitive == GL_LINES && ctx->Line.StippleFlag) 
+      AUTO_STIPPLE( GL_FALSE );
+	  
+   ctx->Driver.CurrentExecPrimitive = GL_POLYGON+1;
+   notify_noop();
+}
+
+
+
+/**
+ * \brief Flush vertices.
+ *
+ * \param ctx GL context.
+ * \param flags flags.
+ *
+ * If FLUSH_UPDATE_CURRENT is et in \p flags then the current vertex attributes
+ * in the GL context is updated from vb_t::floatcolorptr and vb_t::texcoordptr.
+ */
+static void radeonFlushVertices( GLcontext *ctx, GLuint flags )
+{
+   if (flags & FLUSH_UPDATE_CURRENT) {
+      ctx->Current.Attrib[VERT_ATTRIB_COLOR0][0] = vb.floatcolorptr[0];
+      ctx->Current.Attrib[VERT_ATTRIB_COLOR0][1] = vb.floatcolorptr[1];
+      ctx->Current.Attrib[VERT_ATTRIB_COLOR0][2] = vb.floatcolorptr[2];
+      ctx->Current.Attrib[VERT_ATTRIB_COLOR0][3] = vb.floatcolorptr[3];
+
+      if (vb.vertex_format & RADEON_CP_VC_FRMT_ST0) {
+	 ctx->Current.Attrib[VERT_ATTRIB_TEX0][0] = vb.texcoordptr[0];
+	 ctx->Current.Attrib[VERT_ATTRIB_TEX0][1] = vb.texcoordptr[1];
+	 ctx->Current.Attrib[VERT_ATTRIB_TEX0][2] = 0.0F;
+	 ctx->Current.Attrib[VERT_ATTRIB_TEX0][3] = 1.0F;
+      }
+   }
+
+   ctx->Driver.NeedFlush &= ~FLUSH_STORED_VERTICES;
+}
+
+
+/**
+ * \brief Set current vertex coordinates.
+ *
+ * \param x x vertex coordinate.
+ * \param y y vertex coordinate.
+ * \param z z vertex coordinate.
+ * 
+ * Set the current vertex coordinates. If run out of space in this buffer call
+ * the notification callback.
+ */
+static __inline__ void radeon_Vertex3f( GLfloat x, GLfloat y, GLfloat z )
+{
+   int i;
+
+   *vb.stack[0].dmaptr++ = *(int *)&x;
+   *vb.stack[0].dmaptr++ = *(int *)&y;
+   *vb.stack[0].dmaptr++ = *(int *)&z;
+
+   for (i = 3; i < vb.vertex_size; i++) 
+      *vb.stack[0].dmaptr++ = vb.vertex[i].i;
+
+   if (--vb.stack[0].vertspace == 0)
+      vb.stack[0].notify();
+}
+
+/**
+ * \brief Set current vertex color.
+ *
+ * \param r red color component.
+ * \param g gree color component.
+ * \param b blue color component.
+ * \param a alpha color component.
+ *
+ * Sets the current vertex color via vb_t::floatcolorptr.
+ */
+static __inline__  void radeon_Color4f( GLfloat r, GLfloat g,
+					GLfloat b, GLfloat a )
+{
+   GLfloat *dest = vb.floatcolorptr;
+   dest[0] = r;
+   dest[1] = g;
+   dest[2] = b;
+   dest[3] = a;
+}
+
+/**
+ * \brief Set current vertex texture coordinates.
+ *
+ * \param s texture coordinate.
+ * \param t texture coordinate.
+ *
+ * Sets the current vertex color via vb_t::texcoordptr.
+ */
+static __inline__ void radeon_TexCoord2f( GLfloat s, GLfloat t )
+{
+   GLfloat *dest = vb.texcoordptr;
+   dest[0] = s;
+   dest[1] = t;
+}
+
+/**
+ * Calls radeon_Vertex3f(), which is expanded inline by the compiler to be
+ * efficient.
+ */
+static void radeon_Vertex3fv( const GLfloat *v )
+{
+   radeon_Vertex3f( v[0], v[1], v[2] );
+}
+
+/**
+ * Calls radeon_Vertex3f(), which is expanded inline by the compiler to be
+ * efficient.
+ */
+static void radeon_Vertex2f( GLfloat x, GLfloat y )
+{
+   radeon_Vertex3f( x, y, 0 );
+}
+
+/**
+ * Calls radeon_Vertex3f(), which is expanded inline by the compiler to be
+ * efficient.
+ */
+static void radeon_Vertex2fv( const GLfloat *v )
+{
+   radeon_Vertex3f( v[0], v[1], 0 );
+}
+
+/**
+ * Calls radeon_Vertex3f(), which is expanded inline by the compiler to be
+ * efficient.
+ */
+static void radeon_Color4fv( const GLfloat *v )
+{
+   radeon_Color4f( v[0], v[1], v[2], v[3] );
+}
+
+/**
+ * Calls radeon_Color4f(), which is expanded inline by the compiler to be
+ * efficient.
+ */
+static void radeon_Color3f( GLfloat r, GLfloat g, GLfloat b )
+{
+   radeon_Color4f( r, g, b, 1.0 );
+}
+
+/**
+ * Calls radeon_Color4f(), which is expanded inline by the compiler to be
+ * efficient.
+ */
+static void radeon_Color3fv( const GLfloat *v )
+{
+   radeon_Color4f( v[0], v[1], v[2], 1.0 );
+}
+
+/**
+ * Calls radeon_TexCoord2f(), which is expanded inline by the compiler to be
+ * efficient.
+ */
+static void radeon_TexCoord2fv( const GLfloat *v )
+{
+   radeon_TexCoord2f( v[0], v[1] );
+}
+
+
+/**
+ * No-op.
+ */
+void radeonVtxfmtUnbindContext( GLcontext *ctx )
+{
+}
+
+/**
+ * No-op.
+ */
+void radeonVtxfmtMakeCurrent( GLcontext *ctx )
+{
+}
+
+/**
+ * No-op.
+ */
+void radeonVtxfmtDestroy( GLcontext *ctx )
+{
+}
+
+/**
+ * \brief Software rendering fallback.
+ *
+ * \param ctx GL context.
+ * \param bit fallback bitmask.
+ * \param mode enable or disable.
+ * 
+ * Does nothing except display a warning message if \p mode is set.
+ */
+void radeonFallback( GLcontext *ctx, GLuint bit, GLboolean mode )
+{
+   if (mode)
+      fprintf(stderr, "Warning: hit nonexistant fallback path!\n");
+}
+
+/**
+ * \brief Software TCL fallback.
+ *
+ * \param ctx GL context.
+ * \param bit fallback bitmask.
+ * \param mode enable or disable.
+ * 
+ * Does nothing except display a warning message if \p mode is set.
+ */
+void radeonTclFallback( GLcontext *ctx, GLuint bit, GLboolean mode )
+{
+   if (mode)
+      fprintf(stderr, "Warning: hit nonexistant fallback path!\n");
+}
+
+/**
+ * \brief Called by radeonPointsBitmap() to disable TCL.
+ *
+ * \param rmesa Radeon context.
+ * \param flag whether to enable or disable TCL.
+ * 
+ * Updates radeon_tcl_info::tcl_flag.
+ */
+void radeonSubsetVtxEnableTCL( radeonContextPtr rmesa, GLboolean flag )
+{
+   rmesa->tcl.tcl_flag = flag ? RADEON_CP_VC_CNTL_TCL_ENABLE : 0;
+}
+
+
+
+/**********************************************************************/
+/** \name        Noop mode for operation without focus                */
+/**********************************************************************/
+/*@{*/
+
+
+/**
+ * \brief Process glBegin().
+ *
+ * \param mode primitive.
+ */ 
+static void radeon_noop_Begin(GLenum mode)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (mode > GL_POLYGON) {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glBegin" );
+      return;
+   }
+
+   if (ctx->Driver.CurrentExecPrimitive != GL_POLYGON+1) {
+      _mesa_error( ctx, GL_INVALID_OPERATION, "glBegin" );
+      return;
+   }
+
+   ctx->Driver.CurrentExecPrimitive = mode;
+}
+
+/**
+ * \brief Process glEnd().
+ */
+static void radeon_noop_End(void)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ctx->Driver.CurrentExecPrimitive = GL_POLYGON+1;
+}
+
+
+/**
+ * \brief Install the noop callbacks.
+ *
+ * \param ctx GL context.
+ *
+ * Installs the noop callbacks into the glapi table.  These functions
+ * will not attempt to emit any DMA vertices, but will keep internal
+ * GL state updated.  Borrows heavily from the select code.
+ */
+static void radeon_noop_Install( GLcontext *ctx )
+{
+   ctx->Exec->Begin = radeon_noop_Begin;
+   ctx->Exec->End = radeon_noop_End;
+
+   vb.texcoordptr = ctx->Current.Attrib[VERT_ATTRIB_TEX0];
+   vb.floatcolorptr = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
+
+   notify_noop();
+}
+
+
+/**
+ * \brief Setup the GL context callbacks.
+ * 
+ * \param ctx GL context.
+ * 
+ * Setups the GL context callbacks and links _glapi_table entries related to
+ * the glBegin()/glEnd() pairs to the functions in this module.
+ * 
+ * Called by radeonCreateContext() and radeonRenderMode().
+ */
+void radeonVtxfmtInit( GLcontext *ctx )
+{
+   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
+   struct _glapi_table *exec = ctx->Exec;
+
+   exec->Color3f = radeon_Color3f;
+   exec->Color3fv = radeon_Color3fv;
+   exec->Color4f = radeon_Color4f;
+   exec->Color4fv = radeon_Color4fv;
+   exec->TexCoord2f = radeon_TexCoord2f;
+   exec->TexCoord2fv = radeon_TexCoord2fv;
+   exec->Vertex2f = radeon_Vertex2f;
+   exec->Vertex2fv = radeon_Vertex2fv;
+   exec->Vertex3f = radeon_Vertex3f;
+   exec->Vertex3fv = radeon_Vertex3fv;
+   exec->Begin = radeon_Begin;
+   exec->End = radeon_End;
+
+   vb.context = ctx;
+   
+   ctx->Driver.FlushVertices = radeonFlushVertices;
+   ctx->Driver.CurrentExecPrimitive = GL_POLYGON+1;
+
+   if (rmesa->radeonScreen->buffers) {
+      radeonVtxfmtValidate( ctx );
+      notify_noop();
+   }
+   else 
+      radeon_noop_Install( ctx );
+}
+
+
+/*@}*/
+
+