Mesa (master): tnl: Only map the necessary buffer range in bind_indices

[Ian Romanick]

Module: Mesa
Branch: master
Commit: 2ea1ff38164d95f8291ef2e5dfe2cb13936a60f2
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2ea1ff38164d95f8291ef2e5dfe2cb13936a60f2

Author: Ian Romanick <ian.d.romanick at intel.com>
Date:   Mon Aug 22 00:31:19 2011 -0700

tnl: Only map the necessary buffer range in bind_indices

Signed-off-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Brian Paul <brianp at vmware.com>
Acked-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/mesa/tnl/t_draw.c |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/src/mesa/tnl/t_draw.c b/src/mesa/tnl/t_draw.c
index a23d175..86af4b7 100644
--- a/src/mesa/tnl/t_draw.c
+++ b/src/mesa/tnl/t_draw.c
@@ -347,16 +347,32 @@ static void bind_indices( struct gl_context *ctx,
    }
 
    if (ib->obj->Name && !ib->obj->Pointer) {
+      unsigned map_size;
+
+      switch (ib->type) {
+      case GL_UNSIGNED_BYTE:
+	 map_size = ib->count * sizeof(GLubyte);
+	 break;
+      case GL_UNSIGNED_SHORT:
+	 map_size = ib->count * sizeof(GLushort);
+	 break;
+      case GL_UNSIGNED_INT:
+	 map_size = ib->count * sizeof(GLuint);
+	 break;
+      default:
+	 assert(0);
+	 map_size = 0;
+      }
+
       bo[*nr_bo] = ib->obj;
       (*nr_bo)++;
-      ctx->Driver.MapBufferRange(ctx, 0, ib->obj->Size, GL_MAP_READ_BIT,
-				 ib->obj);
-
+      ptr = ctx->Driver.MapBufferRange(ctx, (GLsizeiptr) ib->ptr, map_size,
+				       GL_MAP_READ_BIT, ib->obj);
       assert(ib->obj->Pointer);
+   } else {
+      ptr = ib->ptr;
    }
 
-   ptr = ADD_POINTERS(ib->obj->Pointer, ib->ptr);
-
    if (ib->type == GL_UNSIGNED_INT && VB->Primitive[0].basevertex == 0) {
       VB->Elts = (GLuint *) ptr;
    }