1 files changed, 6 insertions, 0 deletions
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 0b8fb94e8fb..538322e9eb8 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -588,6 +588,12 @@ _mesa_init_constants(struct gl_context *ctx)
    ctx->Const.MaxViewportWidth = MAX_VIEWPORT_WIDTH;
    ctx->Const.MaxViewportHeight = MAX_VIEWPORT_HEIGHT;
 
+   /* Driver must override these values if ARB_viewport_array is supported. */
+   ctx->Const.MaxViewports = 1;
+   ctx->Const.ViewportSubpixelBits = 0;
+   ctx->Const.ViewportBounds.Min = 0;
+   ctx->Const.ViewportBounds.Max = 0;
+
    /** GL_ARB_uniform_buffer_object */
    ctx->Const.MaxCombinedUniformBlocks = 36;
    ctx->Const.MaxUniformBufferBindings = 36;