1 files changed, 78 insertions, 0 deletions
diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index 894d99afd2..96f1b30c9b 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -338,6 +338,84 @@ _mesa_resize_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb,
 }
 
 
+
+/**
+ * XXX THIS IS OBSOLETE - drivers should take care of detecting window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 );
+      }
+   }
+
+   if (ctx->WinSysReadBuffer
+       && ctx->WinSysReadBuffer != ctx->WinSysDrawBuffer) {
+      GLuint newWidth, newHeight;
+      GLframebuffer *buffer = ctx->WinSysReadBuffer;
+
+      assert(buffer->Name == 0);
+
+      /* ask device driver for size of read 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 );
+      }
+   }
+
+   ctx->NewState |= _NEW_BUFFERS;  /* to update scissor / window bounds */
+}
+
+
+/*
+ * XXX THIS IS OBSOLETE
+ */
+void GLAPIENTRY
+_mesa_ResizeBuffersMESA( void )
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (ctx->Extensions.MESA_resize_buffers)
+      _mesa_resizebuffers( ctx );
+}
+
+
+
 /**
  * Examine all the framebuffer's renderbuffers to update the Width/Height
  * fields of the framebuffer.  If we have renderbuffers with different