Mesa (7.10): st/mesa: fix crash when using both user and vbo buffers with the same stride

[Marek Olšák]

Module: Mesa
Branch: 7.10
Commit: ea26cc8696013d6c44b915e96ed438cfcedc0a2c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ea26cc8696013d6c44b915e96ed438cfcedc0a2c

Author: Marek Olšák <maraeo at gmail.com>
Date:   Sun Feb 20 18:05:24 2011 +0100

st/mesa: fix crash when using both user and vbo buffers with the same stride

If two buffers had the same stride where one buffer is a user one and
the other is a vbo, it was considered to be one interleaved buffer,
resulting in incorrect rendering and crashes.

This patch makes sure that the interleaved buffer is either user or vbo,
not both.
(cherry picked from commit 695cdee67827ee2c11e1445eb2022d3a530f1b23)

---

 src/mesa/state_tracker/st_draw.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/src/mesa/state_tracker/st_draw.c b/src/mesa/state_tracker/st_draw.c
index 61a0e1b..73e3aeb 100644
--- a/src/mesa/state_tracker/st_draw.c
+++ b/src/mesa/state_tracker/st_draw.c
@@ -250,6 +250,7 @@ is_interleaved_arrays(const struct st_vertex_program *vp,
    GLint firstStride = -1;
    GLuint num_client_arrays = 0;
    const GLubyte *client_addr = NULL;
+   GLboolean user_memory;
 
    for (attr = 0; attr < vpv->num_inputs; attr++) {
       const GLuint mesaAttr = vp->index_to_input[attr];
@@ -258,6 +259,7 @@ is_interleaved_arrays(const struct st_vertex_program *vp,
 
       if (firstStride < 0) {
          firstStride = stride;
+         user_memory = !bufObj || !bufObj->Name;
       }
       else if (firstStride != stride) {
          return GL_FALSE;
@@ -268,6 +270,9 @@ is_interleaved_arrays(const struct st_vertex_program *vp,
          /* Try to detect if the client-space arrays are
           * "close" to each other.
           */
+         if (!user_memory) {
+            return GL_FALSE;
+         }
          if (!client_addr) {
             client_addr = arrays[mesaAttr]->Ptr;
          }
@@ -277,6 +282,9 @@ is_interleaved_arrays(const struct st_vertex_program *vp,
          }
       }
       else if (!firstBufObj) {
+         if (user_memory) {
+            return GL_FALSE;
+         }
          firstBufObj = bufObj;
       }
       else if (bufObj != firstBufObj) {