Start a vertex buffer constuction stage for i915 based on Keith's draft done on softpipe.

1 files changed, 314 insertions, 0 deletions

diff --git a/src/mesa/pipe/i915simple/i915_prim_vbuf.c b/src/mesa/pipe/i915simple/i915_prim_vbuf.c
new file mode 100644
index 00000000000..a80af001378
--- /dev/null
+++ b/src/mesa/pipe/i915simple/i915_prim_vbuf.c
@@ -0,0 +1,314 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 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 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 TUNGSTEN GRAPHICS AND/OR ITS 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.
+ * 
+ **************************************************************************/
+
+/**
+ * \file
+ * Build post-transformation, post-clipping vertex buffers and element
+ * lists by hooking into the end of the primitive pipeline and
+ * manipulating the vertex_id field in the vertex headers.
+ *
+ * XXX: work in progress 
+ * 
+ * \author José Fonseca <[email protected]>
+ * \author Keith Whitwell <[email protected]>
+ */
+
+
+#include "pipe/draw/draw_private.h"
+#include "pipe/draw/draw_vertex.h"
+#include "pipe/p_util.h"
+
+#include "softpipe/sp_context.h"
+#include "softpipe/sp_headers.h"
+#include "softpipe/sp_quad.h"
+#include "softpipe/sp_prim_setup.h"
+
+#include "i915_context.h"
+
+
+static void vbuf_flush_elements( struct draw_stage *stage );
+
+
+#define VBUF_SIZE (64*1024)
+#define IBUF_SIZE (16*1024)
+
+
+/**
+ * Vertex buffer emit stage.
+ */
+struct vbuf_stage {
+   struct draw_stage stage; /**< This must be first (base class) */
+
+   vbuf_draw_func draw;
+
+   /* Vertices are passed in as an array of floats making up each
+    * attribute in turn.  Will eventually convert to hardware format
+    * in this stage.
+    */
+   char *vertex_map;
+   char *vertex_ptr;
+   unsigned vertex_size;
+   unsigned nr_vertices;
+
+   unsigned max_vertices;
+
+   ushort *element_map;
+   unsigned nr_elements;
+
+   unsigned prim;
+
+   struct i915_context *i915;   
+};
+
+
+/**
+ * Basically a cast wrapper.
+ */
+static INLINE struct vbuf_stage *vbuf_stage( struct draw_stage *stage )
+{
+   return (struct vbuf_stage *)stage;
+}
+
+
+static boolean overflow( void *map, void *ptr, unsigned bytes, unsigned bufsz )
+{
+   unsigned long used = (char *)ptr - (char *)map;
+   return (used + bytes) > bufsz;
+}
+
+
+static boolean check_space( struct vbuf_stage *vbuf )
+{
+   if (overflow( vbuf->vertex_map, 
+                 vbuf->vertex_ptr,  
+                 4 * vbuf->vertex_size, 
+                 VBUF_SIZE ))
+      return FALSE;
+
+   
+   if (vbuf->nr_elements + 4 > IBUF_SIZE / sizeof(ushort) )
+      return FALSE;
+   
+   return TRUE;
+}
+
+
+static void emit_vertex( struct vbuf_stage *vbuf,
+                         struct vertex_header *vertex )
+{
+//   fprintf(stderr, "emit vertex %d to %p\n", 
+//           vbuf->nr_vertices, vbuf->vertex_ptr);
+
+   vertex->vertex_id = vbuf->nr_vertices++;
+
+   //vbuf->emit_vertex( vbuf->vertex_ptr, vertex );
+   memcpy(vbuf->vertex_ptr, vertex, vbuf->vertex_size);
+
+   vbuf->vertex_ptr += vbuf->vertex_size;
+}
+
+
+static void vbuf_tri( struct draw_stage *stage,
+                      struct prim_header *prim )
+{
+   struct vbuf_stage *vbuf = vbuf_stage( stage );
+   unsigned i;
+
+   if (!check_space( vbuf ))
+      vbuf_flush_elements( stage );
+
+   for (i = 0; i < 3; i++) {
+      if (prim->v[i]->vertex_id == 0xffff) 
+         emit_vertex( vbuf, prim->v[i] );
+      
+      vbuf->element_map[vbuf->nr_elements++] = prim->v[i]->vertex_id;
+   }
+}
+
+
+static void vbuf_line(struct draw_stage *stage, 
+                      struct prim_header *prim)
+{
+   struct vbuf_stage *vbuf = vbuf_stage( stage );
+   unsigned i;
+
+   if (!check_space( vbuf ))
+      vbuf_flush_elements( stage );
+
+   for (i = 0; i < 2; i++) {
+      if (prim->v[i]->vertex_id == 0xffff) 
+         emit_vertex( vbuf, prim->v[i] );
+
+      vbuf->element_map[vbuf->nr_elements++] = prim->v[i]->vertex_id;
+   }   
+}
+
+
+static void vbuf_point(struct draw_stage *stage, 
+                       struct prim_header *prim)
+{
+   struct vbuf_stage *vbuf = vbuf_stage( stage );
+
+   if (!check_space( vbuf ))
+      vbuf_flush_elements( stage );
+
+   if (prim->v[0]->vertex_id == 0xffff) 
+      emit_vertex( vbuf, prim->v[0] );
+   
+   vbuf->element_map[vbuf->nr_elements++] = prim->v[0]->vertex_id;
+}
+
+
+static void vbuf_first_tri( struct draw_stage *stage,
+                            struct prim_header *prim )
+{
+   struct vbuf_stage *vbuf = vbuf_stage( stage );
+
+   vbuf_flush_elements( stage );   
+   stage->tri = vbuf_tri;
+   stage->tri( stage, prim );
+   vbuf->prim = PIPE_PRIM_TRIANGLES;
+}
+
+
+static void vbuf_first_line( struct draw_stage *stage,
+                             struct prim_header *prim )
+{
+   struct vbuf_stage *vbuf = vbuf_stage( stage );
+
+   vbuf_flush_elements( stage );
+   stage->line = vbuf_line;
+   stage->line( stage, prim );
+   vbuf->prim = PIPE_PRIM_LINES;
+}
+
+
+static void vbuf_first_point( struct draw_stage *stage,
+                              struct prim_header *prim )
+{
+   struct vbuf_stage *vbuf = vbuf_stage( stage );
+
+   vbuf_flush_elements( stage );
+   stage->point = vbuf_point;
+   stage->point( stage, prim );
+   vbuf->prim = PIPE_PRIM_POINTS;
+}
+
+
+static void vbuf_draw( struct pipe_context *pipe,
+                       unsigned prim,
+                       const ushort *elements,
+                       unsigned nr_elements,
+                       const void *vertex_buffer,
+                       unsigned nr_vertices ) 
+{
+   /* FIXME: */
+}
+
+
+static void vbuf_flush_elements( struct draw_stage *stage )
+{
+   struct vbuf_stage *vbuf = vbuf_stage( stage );
+
+   if (vbuf->nr_elements) {
+      fprintf(stderr, "%s (%d elts)\n", __FUNCTION__, vbuf->nr_elements);
+
+      /* Draw now or add to list of primitives???
+       */
+      vbuf_draw( &vbuf->i915->pipe,
+                  vbuf->prim,
+                  vbuf->element_map,
+                  vbuf->nr_elements,
+                  vbuf->vertex_map,
+                  (vbuf->vertex_ptr - vbuf->vertex_map) / vbuf->vertex_size );
+      
+      vbuf->nr_elements = 0;
+
+      vbuf->vertex_ptr = vbuf->vertex_map;
+      vbuf->nr_vertices = 0;
+
+      /* Reset vertex ids?  Actually, want to not do that unless our
+       * vertex buffer is full.  Would like separate
+       * flush-on-index-full and flush-on-vb-full, but may raise
+       * issues uploading vertices if the hardware wants to flush when
+       * we flush.
+       */
+      draw_vertex_cache_reset_vertex_ids( vbuf->i915->draw );
+   }
+
+   stage->tri = vbuf_first_tri;
+   stage->line = vbuf_first_line;
+   stage->point = vbuf_first_point;
+}
+
+
+static void vbuf_begin( struct draw_stage *stage )
+{
+   struct vbuf_stage *vbuf = vbuf_stage(stage);
+
+   vbuf->vertex_size = vbuf->i915->draw->vertex_info.size * sizeof(float);
+}
+
+
+static void vbuf_end( struct draw_stage *stage )
+{
+   /* Overkill.
+    */
+   vbuf_flush_elements( stage );
+}
+
+
+static void reset_stipple_counter( struct draw_stage *stage )
+{
+   /* XXX:  This doesn't work.
+    */
+}
+
+
+/**
+ * Create a new primitive vbuf/render stage.
+ */
+struct draw_stage *i915_draw_vbuf_stage( struct i915_context *i915 )
+{
+   struct vbuf_stage *vbuf = CALLOC_STRUCT(vbuf_stage);
+
+   vbuf->i915 = i915;
+   vbuf->stage.draw = i915->draw;
+   vbuf->stage.begin = vbuf_begin;
+   vbuf->stage.point = vbuf_first_point;
+   vbuf->stage.line = vbuf_first_line;
+   vbuf->stage.tri = vbuf_first_tri;
+   vbuf->stage.end = vbuf_end;
+   vbuf->stage.reset_stipple_counter = reset_stipple_counter;
+
+   vbuf->element_map = malloc( IBUF_SIZE );
+   vbuf->vertex_map = malloc( VBUF_SIZE );
+   
+   vbuf->vertex_ptr = vbuf->vertex_map;
+   
+   return &vbuf->stage;
+}