gallium: add point size clamp to implementation limits in vertex shader

The point size min/max registers (unused by mesa state tracker) were removed
since most hardware couldn't do much with them. However, we don't want to have
to rely on hw to do point size clamping correctly to implementation
dependent limits, hence have to do that in the vertex shader. This should also
solve a potential problem with (non-AA) points smaller than 1.0 which according
to OGL still have size 1.0.
Note that OGL point rendering is odd, in particular point sprites are rasterized
differently to points. Some hardware might support those different modes, but in
any case the different clamping values used for smooth/multisampled/sprite
enabled points might help a bit for hw which rasterizes points the same as point
sprites.
Also tweak mesa's ff to vertex shader translation so don't have to clamp twice in
case of point attenuation.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/mesa/main/ffvertex_prog.c b/src/mesa/main/ffvertex_prog.c
index 2d1db29cbf..867a55242c 100644
--- a/src/mesa/main/ffvertex_prog.c
+++ b/src/mesa/main/ffvertex_prog.c
@@ -1496,7 +1496,7 @@ static void build_texture_transform( struct tnl_program *p )
 static void build_atten_pointsize( struct tnl_program *p )
 {
    struct ureg eye = get_eye_position_z(p);
-   struct ureg state_size = register_param1(p, STATE_POINT_SIZE);
+   struct ureg state_size = register_param2(p, STATE_INTERNAL, STATE_POINT_SIZE_CLAMPED);
    struct ureg state_attenuation = register_param1(p, STATE_POINT_ATTENUATION);
    struct ureg out = register_output(p, VERT_RESULT_PSIZ);
    struct ureg ut = get_temp(p);