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-rw-r--r--src/mesa/pipe/draw/draw_clip.c94
-rw-r--r--src/mesa/pipe/draw/draw_context.c3
-rw-r--r--src/mesa/pipe/draw/draw_context.h3
-rw-r--r--src/mesa/pipe/draw/draw_prim.c2
-rw-r--r--src/mesa/pipe/draw/draw_private.h1
5 files changed, 63 insertions, 40 deletions
diff --git a/src/mesa/pipe/draw/draw_clip.c b/src/mesa/pipe/draw/draw_clip.c
index f46f4e3de6..a23b7a2810 100644
--- a/src/mesa/pipe/draw/draw_clip.c
+++ b/src/mesa/pipe/draw/draw_clip.c
@@ -50,10 +50,17 @@
#endif
+/** bitmask for the first view-frustum clip planes */
+#define VIEWPLANE_MASK ((1 << 6) - 1)
+
+/** bitmask for the user-defined clip planes */
+#define USERPLANE_MASK (((1 << PIPE_MAX_CLIP_PLANES) - 1) << 6)
+
+
+
struct clipper {
struct draw_stage stage; /**< base class */
- unsigned active_user_planes;
float (*plane)[4];
};
@@ -232,17 +239,10 @@ do_clip_tri( struct draw_stage *stage,
inlist[1] = header->v[1];
inlist[2] = header->v[2];
- /* XXX: Note stupid hack to deal with tnl's 8-bit clipmask. Remove
- * this once we correctly use 16bit masks for userclip planes.
- */
clipmask &= ~CLIP_CULL_BIT;
- if (clipmask & CLIP_USER_BIT) {
- clipmask &= ~CLIP_USER_BIT;
- clipmask |= clipper->active_user_planes;
- }
while (clipmask && n >= 3) {
- unsigned plane_idx = ffs(clipmask)-1;
+ const unsigned plane_idx = ffs(clipmask)-1;
const float *plane = clipper->plane[plane_idx];
struct vertex_header *vert_prev = inlist[0];
float dp_prev = dot4( vert_prev->clip, plane );
@@ -318,18 +318,11 @@ do_clip_line( struct draw_stage *stage,
struct vertex_header *v1 = header->v[1];
const float *pos0 = v0->clip;
const float *pos1 = v1->clip;
- float t0 = 0;
- float t1 = 0;
+ float t0 = 0.0F;
+ float t1 = 0.0F;
struct prim_header newprim;
- /* XXX: Note stupid hack to deal with tnl's 8-bit clipmask. Remove
- * this once we correctly use 16bit masks for userclip planes.
- */
clipmask &= ~CLIP_CULL_BIT;
- if (clipmask & CLIP_USER_BIT) {
- clipmask &= ~CLIP_USER_BIT;
- clipmask |= clipper->active_user_planes;
- }
while (clipmask) {
const unsigned plane_idx = ffs(clipmask)-1;
@@ -337,17 +330,21 @@ do_clip_line( struct draw_stage *stage,
const float dp0 = dot4( pos0, plane );
const float dp1 = dot4( pos1, plane );
- if (dp1 < 0) {
+ /* need this to handle user-clip planes properly */
+ if (dp0 < 0.0F && dp1 < 0.0F)
+ return;
+
+ if (dp1 < 0.0F) {
float t = dp1 / (dp1 - dp0);
t1 = MAX2(t1, t);
}
- if (dp0 < 0) {
+ if (dp0 < 0.0F) {
float t = dp0 / (dp0 - dp1);
t0 = MAX2(t0, t);
}
- if (t0 + t1 >= 1.0)
+ if (t0 + t1 >= 1.0F)
return; /* discard */
clipmask &= ~(1 << plane_idx); /* turn off this plane's bit */
@@ -375,18 +372,11 @@ do_clip_line( struct draw_stage *stage,
static void clip_begin( struct draw_stage *stage )
{
- struct clipper *clipper = clipper_stage(stage);
- unsigned nr = stage->draw->nr_planes;
-
/* sanity checks. If these fail, review the clip/interp code! */
assert(stage->draw->vertex_info.num_attribs >= 3);
assert(stage->draw->vertex_info.slot_to_attrib[0] == TGSI_ATTRIB_VERTEX_HEADER);
assert(stage->draw->vertex_info.slot_to_attrib[1] == TGSI_ATTRIB_CLIP_POS);
- /* Hacky bitmask to use when we hit CLIP_USER_BIT:
- */
- clipper->active_user_planes = ((1<<nr)-1) & ~((1<<6)-1);
-
stage->next->begin( stage->next );
}
@@ -395,8 +385,21 @@ static void
clip_point( struct draw_stage *stage,
struct prim_header *header )
{
- if (header->v[0]->clipmask == 0)
+ if (header->v[0]->clipmask == 0) {
stage->next->point( stage->next, header );
+ }
+ else if (header->v[0]->clipmask & USERPLANE_MASK) {
+ /* test against user clip planes now */
+ const struct clipper *clipper = clipper_stage( stage );
+ uint i;
+ for (i = 6; i < stage->draw->nr_planes; i++) {
+ float dot = dot4(clipper->plane[i], header->v[0]->clip);
+ if (dot < 0.0F)
+ return; /* clipped! */
+ }
+ /* not clipped */
+ stage->next->point( stage->next, header );
+ }
}
@@ -405,16 +408,31 @@ clip_line( struct draw_stage *stage,
struct prim_header *header )
{
unsigned clipmask = (header->v[0]->clipmask |
- header->v[1]->clipmask);
+ header->v[1]->clipmask);
if (clipmask == 0) {
/* no clipping needed */
stage->next->line( stage->next, header );
}
- else if ((header->v[0]->clipmask &
- header->v[1]->clipmask) == 0) {
+ else if (((header->v[0]->clipmask &
+ header->v[1]->clipmask &
+ VIEWPLANE_MASK) == 0) ||
+ (clipmask & USERPLANE_MASK)) {
+ /* About the above predicate: the clipmask bits for the view volume
+ * exactly indicate whether the coordinate is inside or outside each
+ * frustum plane. However, the bits for user-defined planes are set
+ * if the plane is enabled, and does not really indicate if the
+ * coordinate is inside or outside the user-defined plane.
+ *
+ * To change this (so that the user-plane bits really indicate
+ * inside/outside) we'd have to compute the dot products earlier
+ * in the draw_prim.c code (see compute_clipmask()).
+ * We will probably do that when we have support for user clip coord
+ * in vertex shaders...
+ */
do_clip_line(stage, header, clipmask);
}
+ /* else, totally clipped */
}
@@ -423,16 +441,18 @@ clip_tri( struct draw_stage *stage,
struct prim_header *header )
{
unsigned clipmask = (header->v[0]->clipmask |
- header->v[1]->clipmask |
- header->v[2]->clipmask);
+ header->v[1]->clipmask |
+ header->v[2]->clipmask);
if (clipmask == 0) {
/* no clipping needed */
stage->next->tri( stage->next, header );
}
- else if ((header->v[0]->clipmask &
- header->v[1]->clipmask &
- header->v[2]->clipmask) == 0) {
+ else if (((header->v[0]->clipmask &
+ header->v[1]->clipmask &
+ header->v[2]->clipmask &
+ VIEWPLANE_MASK) == 0) ||
+ (clipmask & USERPLANE_MASK)) {
do_clip_tri(stage, header, clipmask);
}
}
diff --git a/src/mesa/pipe/draw/draw_context.c b/src/mesa/pipe/draw/draw_context.c
index 760756ce89..b14de34141 100644
--- a/src/mesa/pipe/draw/draw_context.c
+++ b/src/mesa/pipe/draw/draw_context.c
@@ -166,8 +166,11 @@ void draw_set_setup_stage( struct draw_context *draw,
void draw_set_clip_state( struct draw_context *draw,
const struct pipe_clip_state *clip )
{
+ assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
draw->nr_planes = 6 + clip->nr;
+ /* bitmask of the enabled user-defined clip planes */
+ draw->user_clipmask = ((1 << clip->nr) - 1) << 6;
}
diff --git a/src/mesa/pipe/draw/draw_context.h b/src/mesa/pipe/draw/draw_context.h
index 05a3afd5c6..1bd0e624fe 100644
--- a/src/mesa/pipe/draw/draw_context.h
+++ b/src/mesa/pipe/draw/draw_context.h
@@ -56,8 +56,7 @@ struct draw_stage;
#define CLIP_BOTTOM_BIT 0x08
#define CLIP_NEAR_BIT 0x10
#define CLIP_FAR_BIT 0x20
-#define CLIP_USER_BIT 0x40
-#define CLIP_CULL_BIT 0x80
+#define CLIP_CULL_BIT (1 << (6 + PIPE_MAX_CLIP_PLANES)) /*unused? */
/*@}*/
/**
diff --git a/src/mesa/pipe/draw/draw_prim.c b/src/mesa/pipe/draw/draw_prim.c
index 309017cc60..2d613754e8 100644
--- a/src/mesa/pipe/draw/draw_prim.c
+++ b/src/mesa/pipe/draw/draw_prim.c
@@ -248,7 +248,7 @@ run_vertex_program(struct draw_context *draw,
z = vOut[j]->clip[2] = machine.Outputs[0].xyzw[2].f[j];
w = vOut[j]->clip[3] = machine.Outputs[0].xyzw[3].f[j];
- vOut[j]->clipmask = compute_clipmask(x, y, z, w);
+ vOut[j]->clipmask = compute_clipmask(x, y, z, w) | draw->user_clipmask;
vOut[j]->edgeflag = 1;
/* divide by w */
diff --git a/src/mesa/pipe/draw/draw_private.h b/src/mesa/pipe/draw/draw_private.h
index c5d4c62f71..e61f228d12 100644
--- a/src/mesa/pipe/draw/draw_private.h
+++ b/src/mesa/pipe/draw/draw_private.h
@@ -154,6 +154,7 @@ struct draw_context
*/
float plane[12][4];
unsigned nr_planes;
+ unsigned user_clipmask;
/** Describes the layout of post-transformation vertices */
struct vertex_info vertex_info;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 02:31:24 +0000