From a7012eede83f3a6b014b952ff837e5b377a7a12a Mon Sep 17 00:00:00 2001 From: Ilia Mirkin Date: Tue, 11 Feb 2014 00:26:32 -0500 Subject: [PATCH] mesa/st: hardcode the viewport bounds range The bound range is disconnected from the viewport dimensions. This is the relevant bit from glViewportArray: """ The location of the viewport's bottom left corner, given by (x, y) is clamped to be within the implementaiton-dependent viewport bounds range. The viewport bounds range [min, max] can be determined by calling glGet with argument GL_VIEWPORT_BOUNDS_RANGE. Viewport width and height are silently clamped to a range that depends on the implementation. To query this range, call glGet with argument GL_MAX_VIEWPORT_DIMS. """ Just set it to +/-16384, as that is the minimum required by ARB_viewport_array and the value that all current drivers provide. Signed-off-by: Ilia Mirkin Signed-off-by: Dave Airlie --- src/mesa/state_tracker/st_extensions.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c index 1b3b2205fef..e43e7b44ec5 100644 --- a/src/mesa/state_tracker/st_extensions.c +++ b/src/mesa/state_tracker/st_extensions.c @@ -782,8 +782,8 @@ void st_init_extensions(struct st_context *st) if (ctx->API == API_OPENGL_CORE) { ctx->Const.MaxViewports = screen->get_param(screen, PIPE_CAP_MAX_VIEWPORTS); if (ctx->Const.MaxViewports >= 16) { - ctx->Const.ViewportBounds.Min = -(float)ctx->Const.MaxViewportWidth; - ctx->Const.ViewportBounds.Max = ctx->Const.MaxViewportWidth; + ctx->Const.ViewportBounds.Min = -16384.0; + ctx->Const.ViewportBounds.Max = 16384.0; ctx->Extensions.ARB_viewport_array = GL_TRUE; } } -- 2.30.2