vbo: add debug code to verify that buffers are unmapped before drawing

src/mesa/vbo/vbo_exec_array.c

@@ -38,6 +38,26 @@
 #include "vbo_context.h"
 
 
+/**
+ * All vertex buffers should be in an unmapped state when we're about
+ * to draw.  This debug function checks that.
+ */
+static void
+check_buffers_are_unmapped(const struct gl_client_array **inputs)
+{
+#ifdef DEBUG
+   GLuint i;
+
+   for (i = 0; i < VERT_ATTRIB_MAX; i++) {
+      if (inputs[i]) {
+         struct gl_buffer_object *obj = inputs[i]->BufferObj;
+         assert(!_mesa_bufferobj_mapped(obj));
+      }
+   }
+#endif
+}
+
+
 /**
  * Compute min and max elements by scanning the index buffer for
  * glDraw[Range]Elements() calls.
@@ -581,6 +601,7 @@ vbo_draw_arrays(struct gl_context *ctx, GLenum mode, GLint start,
 
       if (primCount > 0) {
          /* draw one or two prims */
+         check_buffers_are_unmapped(exec->array.inputs);
          vbo->draw_prims(ctx, exec->array.inputs, prim, primCount, NULL,
                          GL_TRUE, start, start + count - 1);
       }
@@ -590,6 +611,7 @@ vbo_draw_arrays(struct gl_context *ctx, GLenum mode, GLint start,
       prim[0].start = start;
       prim[0].count = count;
 
+      check_buffers_are_unmapped(exec->array.inputs);
       vbo->draw_prims(ctx, exec->array.inputs, prim, 1, NULL,
                       GL_TRUE, start, start + count - 1);
    }
@@ -795,6 +817,7 @@ vbo_validated_drawrangeelements(struct gl_context *ctx, GLenum mode,
     * for the latter case elsewhere.
     */
 
+   check_buffers_are_unmapped(exec->array.inputs);
    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, &ib,
 		    index_bounds_valid, start, end );
 }
@@ -1111,6 +1134,7 @@ vbo_validated_multidrawelements(struct gl_context *ctx, GLenum mode,
 	    prim[i].basevertex = 0;
       }
 
+      check_buffers_are_unmapped(exec->array.inputs);
       vbo->draw_prims(ctx, exec->array.inputs, prim, primcount, &ib,
 		      GL_FALSE, ~0, ~0);
    } else {
@@ -1135,6 +1159,7 @@ vbo_validated_multidrawelements(struct gl_context *ctx, GLenum mode,
 	 else
 	    prim[0].basevertex = 0;
 
+         check_buffers_are_unmapped(exec->array.inputs);
          vbo->draw_prims(ctx, exec->array.inputs, prim, 1, &ib,
                          GL_FALSE, ~0, ~0);
       }