mesa: Use floats for viewport bounds.

ARB_viewport_array specifies that DEPTH_RANGE consists of double-
precision parameters (corresponding commit d4dc35987), and a preparatory
commit (6340e609a) added _mesa_get_viewport_xform() which returned
double-precision scale[3] and translate[3] vectors, even though X, Y,
Width, and Height were still floats.

All users of _mesa_get_viewport_xform() immediately convert the double
scale and translation vectors into floats (which were floats originally,
but were converted to doubles in _mesa_get_viewport_xform(), sigh).

i965 at least cannot consume doubles (see SF_CLIP_VIEWPORT). If we want
to pass doubles to hardware, we should have a different function that
does that.

Acked-by: Mathias Froehlich <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/mesa/tnl/t_context.c b/src/mesa/tnl/t_context.c
index bc77ba8bf95..b5c0b3e1f5b 100644
--- a/src/mesa/tnl/t_context.c
+++ b/src/mesa/tnl/t_context.c
@@ -190,7 +190,7 @@ _tnl_InvalidateState( struct gl_context *ctx, GLuint new_state )
    }
 
    if (new_state & (_NEW_VIEWPORT | _NEW_BUFFERS)) {
-      double scale[3], translate[3];
+      float scale[3], translate[3];
       _mesa_get_viewport_xform(ctx, 0, scale, translate);
       _math_matrix_viewport(&tnl->_WindowMap, scale, translate,
                             ctx->DrawBuffer->_DepthMaxF);