fix mesa fb binding

Make sure that we bind the right buffer (draw or read) when rebinding
the window framebuffer (the api doesn't allow binding different draw and
read buffers at the same time, but the default window framebuffer is basically
2 fb objects, one for read, one for write, which can be different). Pass both
of these two down the driver api (no driver uses this right now).

2 files changed, 6 insertions, 4 deletions

diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index 88f33943b31..caa50dd6826 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -782,7 +782,7 @@ struct dd_function_table {
    struct gl_framebuffer * (*NewFramebuffer)(GLcontext *ctx, GLuint name);
    struct gl_renderbuffer * (*NewRenderbuffer)(GLcontext *ctx, GLuint name);
    void (*BindFramebuffer)(GLcontext *ctx, GLenum target,
-                           struct gl_framebuffer *fb);
+                           struct gl_framebuffer *fb, struct gl_framebuffer *fbread);
    void (*FramebufferRenderbuffer)(GLcontext *ctx, 
                                    struct gl_framebuffer *fb,
                                    GLenum attachment,
diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index e3bada5ae89..5345310ca1f 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -924,7 +924,7 @@ check_end_texture_render(GLcontext *ctx, struct gl_framebuffer *fb)
 void GLAPIENTRY
 _mesa_BindFramebufferEXT(GLenum target, GLuint framebuffer)
 {
-   struct gl_framebuffer *newFb;
+   struct gl_framebuffer *newFb, *newFbread;
    GLboolean bindReadBuf, bindDrawBuf;
    GET_CURRENT_CONTEXT(ctx);
 
@@ -984,12 +984,14 @@ _mesa_BindFramebufferEXT(GLenum target, GLuint framebuffer)
 	 }
          _mesa_HashInsert(ctx->Shared->FrameBuffers, framebuffer, newFb);
       }
+      newFbread = newFb;
    }
    else {
       /* Binding the window system framebuffer (which was originally set
        * with MakeCurrent).
        */
       newFb = ctx->WinSysDrawBuffer;
+      newFbread = ctx->WinSysReadBuffer;
    }
 
    ASSERT(newFb);
@@ -1000,7 +1002,7 @@ _mesa_BindFramebufferEXT(GLenum target, GLuint framebuffer)
     */
 
    if (bindReadBuf) {
-      _mesa_reference_framebuffer(&ctx->ReadBuffer, newFb);
+      _mesa_reference_framebuffer(&ctx->ReadBuffer, newFbread);
    }
 
    if (bindDrawBuf) {
@@ -1015,7 +1017,7 @@ _mesa_BindFramebufferEXT(GLenum target, GLuint framebuffer)
    }
 
    if (ctx->Driver.BindFramebuffer) {
-      ctx->Driver.BindFramebuffer(ctx, target, newFb);
+      ctx->Driver.BindFramebuffer(ctx, target, newFb, newFbread);
    }
 }