+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
+
+ if (!_mesa_readbuffer_update_fields(ctx, buffer))
+ return;
+
+ ctx->NewState |= _NEW_BUFFERS;
+
+ /*
+ * Call device driver function.
+ */
+ if (ctx->Driver.ReadBuffer)
+ (*ctx->Driver.ReadBuffer)(ctx, buffer);
+}
+
+
+#if _HAVE_FULL_GL
+
+/**
+ * XXX THIS IS OBSOLETE - drivers should take care of detecting window
+ * size changes and act accordingly, likely calling _mesa_resize_framebuffer().
+ *
+ * GL_MESA_resize_buffers extension.
+ *
+ * When this function is called, we'll ask the window system how large
+ * the current window is. If it's a new size, we'll call the driver's
+ * ResizeBuffers function. The driver will then resize its color buffers
+ * as needed, and maybe call the swrast's routine for reallocating
+ * swrast-managed depth/stencil/accum/etc buffers.
+ * \note This function should only be called through the GL API, not
+ * from device drivers (as was done in the past).
+ */
+
+void _mesa_resizebuffers( GLcontext *ctx )
+{
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glResizeBuffersMESA\n");
+
+ if (!ctx->Driver.GetBufferSize) {
+ return;
+ }
+
+ if (ctx->WinSysDrawBuffer) {
+ GLuint newWidth, newHeight;
+ GLframebuffer *buffer = ctx->WinSysDrawBuffer;
+
+ assert(buffer->Name == 0);
+
+ /* ask device driver for size of output buffer */
+ ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight );
+
+ /* see if size of device driver's color buffer (window) has changed */
+ if (buffer->Width != newWidth || buffer->Height != newHeight) {
+ if (ctx->Driver.ResizeBuffers)
+ ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight );