Ulrich Czekalla : winex11.drv: Don' t crash when called with a NULL gl context.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b2f33ffbbb342b0e03ed1a26239946de1808c73d
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=b2f33ffbbb342b0e03ed1a26239946de1808c73d

Author: Ulrich Czekalla <ulrich.czekalla at utoronto.ca>
Date:   Tue Dec 19 11:02:56 2006 -0500

winex11.drv: Don't crash when called with a NULL gl context.

---

 dlls/winex11.drv/opengl.c |   40 ++++++++++++++++++++++++++--------------
 1 files changed, 26 insertions(+), 14 deletions(-)

diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index 07e076d..418067a 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -1795,7 +1795,9 @@ static void WINAPI X11DRV_wglDisable(GLe
     if (cap == GL_SCISSOR_TEST)
     {
        Wine_GLContext *ctx = (Wine_GLContext *) NtCurrentTeb()->glContext;
-       ctx->scissor_enabled = FALSE;
+
+       if (ctx)
+          ctx->scissor_enabled = FALSE;
     }
     else
     {
@@ -1810,7 +1812,9 @@ static void WINAPI X11DRV_wglEnable(GLen
     if (cap == GL_SCISSOR_TEST)
     {
        Wine_GLContext *ctx = (Wine_GLContext *) NtCurrentTeb()->glContext;
-       ctx->scissor_enabled = TRUE;
+
+       if (ctx)
+           ctx->scissor_enabled = TRUE;
     }
     else
     {
@@ -1861,12 +1865,14 @@ static void WINAPI X11DRV_wglGetIntegerv
 
 static GLboolean WINAPI X11DRV_wglIsEnabled(GLenum cap)
 {
-    GLboolean enabled;
+    GLboolean enabled = False;
 
     if (cap == GL_SCISSOR_TEST)
     {
        Wine_GLContext *ctx = (Wine_GLContext *) NtCurrentTeb()->glContext;
-       enabled = ctx->scissor_enabled;
+
+       if (ctx)
+           enabled = ctx->scissor_enabled;
     }
     else
     {
@@ -1881,24 +1887,30 @@ static void WINAPI X11DRV_wglScissor(GLi
 {
     Wine_GLContext *ctx = (Wine_GLContext *) NtCurrentTeb()->glContext;
 
-    ctx->scissor.left = x;
-    ctx->scissor.top = y;
-    ctx->scissor.right = x + width;
-    ctx->scissor.bottom = y + height;
+    if (ctx)
+    {
+        ctx->scissor.left = x;
+        ctx->scissor.top = y;
+        ctx->scissor.right = x + width;
+        ctx->scissor.bottom = y + height;
 
-    sync_current_drawable(TRUE);
+        sync_current_drawable(TRUE);
+    }
 }
 
 static void WINAPI X11DRV_wglViewport(GLint x, GLint y, GLsizei width, GLsizei height)
 {
     Wine_GLContext *ctx = (Wine_GLContext *) NtCurrentTeb()->glContext;
 
-    ctx->viewport.left = x;
-    ctx->viewport.top = y;
-    ctx->viewport.right = x + width;
-    ctx->viewport.bottom = y + height;
+    if (ctx)
+    {
+        ctx->viewport.left = x;
+        ctx->viewport.top = y;
+        ctx->viewport.right = x + width;
+        ctx->viewport.bottom = y + height;
 
-    sync_current_drawable(TRUE);
+        sync_current_drawable(TRUE);
+    }
 }
 
 /**