mesa: add renderbuffer Depth field

With glFramebufferTexture, a renderbuffer may support
all layers of the texture, so we need the depth of the
renderbuffer to check for consistency which is required
for framebuffer completeness.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

src/mesa/main/mtypes.h

@@ -2566,6 +2566,7 @@ struct gl_renderbuffer
    GLuint Name;
    GLint RefCount;
    GLuint Width, Height;
+   GLuint Depth;
    GLboolean Purgeable;  /**< Is the buffer purgeable under memory pressure? */
    GLboolean AttachedAnytime; /**< TRUE if it was attached to a framebuffer */
    GLubyte NumSamples;

src/mesa/main/renderbuffer.c

@@ -53,6 +53,7 @@ _mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)
 
    rb->Width = 0;
    rb->Height = 0;
+   rb->Depth = 0;
    rb->InternalFormat = GL_RGBA;
    rb->Format = MESA_FORMAT_NONE;
 }