vbo: Move vbo_rebase into its only caller module tnl.

Signed-off-by: Mathias Fröhlich <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 251 insertions, 0 deletions

diff --git a/src/mesa/tnl/t_rebase.c b/src/mesa/tnl/t_rebase.c
new file mode 100644
index 00000000000..b781781cb0a
--- /dev/null
+++ b/src/mesa/tnl/t_rebase.c
@@ -0,0 +1,251 @@
+
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (C) 1999-2006  Brian Paul   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, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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:
+ *    Keith Whitwell <[email protected]>
+ */
+
+/* Helper for drivers which find themselves rendering a range of
+ * indices starting somewhere above zero.  Typically the application
+ * is issuing multiple DrawArrays() or DrawElements() to draw
+ * successive primitives layed out linearly in the vertex arrays.
+ * Unless the vertex arrays are all in a VBO, the OpenGL semantics
+ * imply that we need to re-upload the vertex data on each draw call.
+ * In that case, we want to avoid starting the upload at zero, as it
+ * will mean every draw call uploads an increasing amount of not-used
+ * vertex data.  Worse - in the software tnl module, all those
+ * vertices will be transformed and lit.
+ *
+ * If we just upload the new data, however, the indices will be
+ * incorrect as we tend to upload each set of vertex data to a new
+ * region.  
+ *
+ * This file provides a helper to adjust the arrays, primitives and
+ * indices of a draw call so that it can be re-issued with a min_index
+ * of zero.
+ */
+
+#include <stdio.h>
+#include "main/glheader.h"
+#include "main/imports.h"
+#include "main/mtypes.h"
+
+#include "t_rebase.h"
+
+
+#define REBASE(TYPE) 						\
+static void *rebase_##TYPE( const void *ptr,			\
+			  GLuint count, 			\
+			  TYPE min_index )			\
+{								\
+   GLuint i;							\
+   const TYPE *in = (TYPE *)ptr;				\
+   TYPE *tmp_indices = malloc(count * sizeof(TYPE));		\
+								\
+   if (tmp_indices == NULL) {                                   \
+      _mesa_error_no_memory(__func__);                          \
+      return NULL;                                              \
+   }                                                            \
+								\
+   for (i = 0; i < count; i++)  				\
+      tmp_indices[i] = in[i] - min_index;			\
+								\
+   return (void *)tmp_indices;					\
+}
+
+
+REBASE(GLuint)
+REBASE(GLushort)
+REBASE(GLubyte)
+
+
+
+/* Adjust primitives, indices and vertex definitions so that min_index
+ * becomes zero. There are lots of reasons for wanting to do this, eg:
+ *
+ * Software tnl:
+ *    - any time min_index != 0, otherwise unused vertices lower than
+ *      min_index will be transformed.
+ *
+ * Hardware tnl:
+ *    - if ib != NULL and min_index != 0, otherwise vertices lower than 
+ *      min_index will be uploaded.  Requires adjusting index values.
+ *
+ *    - if ib == NULL and min_index != 0, just for convenience so this doesn't
+ *      have to be handled within the driver.
+ *
+ * Hardware tnl with VBO support:
+ *    - as above, but only when vertices are not (all?) in VBO's.
+ *    - can't save time by trying to upload half a vbo - typically it is
+ *      all or nothing.
+ */
+void t_rebase_prims( struct gl_context *ctx,
+                     const struct gl_vertex_array *arrays[],
+                     const struct _mesa_prim *prim,
+                     GLuint nr_prims,
+                     const struct _mesa_index_buffer *ib,
+                     GLuint min_index,
+                     GLuint max_index,
+                     vbo_draw_func draw )
+{
+   struct gl_vertex_array tmp_arrays[VERT_ATTRIB_MAX];
+   const struct gl_vertex_array *tmp_array_pointers[VERT_ATTRIB_MAX];
+
+   struct _mesa_index_buffer tmp_ib;
+   struct _mesa_prim *tmp_prims = NULL;
+   const struct gl_vertex_array **saved_arrays = ctx->Array._DrawArrays;
+   void *tmp_indices = NULL;
+   GLuint i;
+
+   assert(min_index != 0);
+
+   if (0)
+      printf("%s %d..%d\n", __func__, min_index, max_index);
+
+
+   /* XXX this path is disabled for now.
+    * There's rendering corruption in some apps when it's enabled.
+    */
+   if (0 && ib && ctx->Extensions.ARB_draw_elements_base_vertex) {
+      /* If we can just tell the hardware or the TNL to interpret our
+       * indices with a different base, do so.
+       */
+      tmp_prims = malloc(sizeof(*prim) * nr_prims);
+
+      if (tmp_prims == NULL) {
+         _mesa_error_no_memory(__func__);
+         return;
+      }
+
+      for (i = 0; i < nr_prims; i++) {
+	 tmp_prims[i] = prim[i];
+	 tmp_prims[i].basevertex -= min_index;
+      }
+
+      prim = tmp_prims;
+   } else if (ib) {
+      /* Unfortunately need to adjust each index individually.
+       */
+      GLboolean map_ib = ib->obj->Name &&
+                         !ib->obj->Mappings[MAP_INTERNAL].Pointer;
+      void *ptr;
+
+      if (map_ib) 
+	 ctx->Driver.MapBufferRange(ctx, 0, ib->obj->Size, GL_MAP_READ_BIT,
+				    ib->obj, MAP_INTERNAL);
+
+
+      ptr = ADD_POINTERS(ib->obj->Mappings[MAP_INTERNAL].Pointer, ib->ptr);
+
+      /* Some users might prefer it if we translated elements to
+       * GLuints here.  Others wouldn't...
+       */
+      switch (ib->index_size) {
+      case 4:
+	 tmp_indices = rebase_GLuint( ptr, ib->count, min_index );
+	 break;
+      case 2:
+	 tmp_indices = rebase_GLushort( ptr, ib->count, min_index );
+	 break;
+      case 1:
+	 tmp_indices = rebase_GLubyte( ptr, ib->count, min_index );
+	 break;
+      }      
+
+      if (map_ib) 
+	 ctx->Driver.UnmapBuffer(ctx, ib->obj, MAP_INTERNAL);
+
+      if (tmp_indices == NULL) {
+         return;
+      }
+
+      tmp_ib.obj = ctx->Shared->NullBufferObj;
+      tmp_ib.ptr = tmp_indices;
+      tmp_ib.count = ib->count;
+      tmp_ib.index_size = ib->index_size;
+
+      ib = &tmp_ib;
+   }
+   else {
+      /* Otherwise the primitives need adjustment.
+       */
+      tmp_prims = malloc(sizeof(*prim) * nr_prims);
+
+      if (tmp_prims == NULL) {
+         _mesa_error_no_memory(__func__);
+         return;
+      }
+
+      for (i = 0; i < nr_prims; i++) {
+	 /* If this fails, it could indicate an application error:
+	  */
+	 assert(prim[i].start >= min_index);
+
+	 tmp_prims[i] = prim[i];
+	 tmp_prims[i].start -= min_index;
+      }
+
+      prim = tmp_prims;
+   }
+
+   /* Just need to adjust the pointer values on each incoming array.
+    * This works for VBO and non-vbo rendering and shouldn't pesimize
+    * VBO-based upload schemes.  However this may still not be a fast
+    * path for hardware tnl for VBO based rendering as most machines
+    * will be happier if you just specify a starting vertex value in
+    * each primitive.
+    *
+    * For drivers with hardware tnl, you only want to do this if you
+    * are forced to, eg non-VBO indexed rendering with start != 0.
+    */
+   for (i = 0; i < VERT_ATTRIB_MAX; i++) {
+      tmp_arrays[i] = *arrays[i];
+      tmp_arrays[i].Ptr += min_index * tmp_arrays[i].StrideB;
+      tmp_array_pointers[i] = &tmp_arrays[i];
+   }
+   
+   /* Re-issue the draw call.
+    */
+   ctx->Array._DrawArrays = tmp_array_pointers;
+   ctx->NewDriverState |= ctx->DriverFlags.NewArray;
+
+   draw( ctx, 
+	 prim,
+	 nr_prims, 
+	 ib, 
+	 GL_TRUE,
+	 0, 
+	 max_index - min_index,
+	 NULL, 0, NULL );
+
+   ctx->Array._DrawArrays = saved_arrays;
+   ctx->NewDriverState |= ctx->DriverFlags.NewArray;
+   
+   free(tmp_indices);
+   
+   free(tmp_prims);
+}
+
+
+