st/mesa: add support for GL_EXT_window_rectangles

Make sure to pass the requisite information in draws, blits, and clears
that work on the context's draw buffer.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_atom_scissor.c b/src/mesa/state_tracker/st_atom_scissor.c
index 605d5cba9e7..72539df24fc 100644
--- a/src/mesa/state_tracker/st_atom_scissor.c
+++ b/src/mesa/state_tracker/st_atom_scissor.c
@@ -99,6 +99,46 @@ update_scissor( struct st_context *st )
       st->pipe->set_scissor_states(st->pipe, 0, ctx->Const.MaxViewports, scissor); /* activate */
 }
 
+static void
+update_window_rectangles(struct st_context *st)
+{
+   struct pipe_scissor_state new_rects[PIPE_MAX_WINDOW_RECTANGLES];
+   const struct gl_context *ctx = st->ctx;
+   const struct gl_scissor_attrib *scissor = &ctx->Scissor;
+   unsigned i;
+   bool changed = false;
+   unsigned num_rects = scissor->NumWindowRects;
+   bool include = scissor->WindowRectMode == GL_INCLUSIVE_EXT;
+
+   if (ctx->DrawBuffer == ctx->WinSysDrawBuffer) {
+      num_rects = 0;
+      include = false;
+   }
+   for (i = 0; i < num_rects; i++) {
+      const struct gl_scissor_rect *rect = &scissor->WindowRects[i];
+      new_rects[i].minx = MAX2(rect->X, 0);
+      new_rects[i].miny = MAX2(rect->Y, 0);
+      new_rects[i].maxx = MAX2(rect->X + rect->Width, 0);
+      new_rects[i].maxy = MAX2(rect->Y + rect->Height, 0);
+   }
+   if (num_rects > 0 && memcmp(new_rects, st->state.window_rects.rects,
+                               num_rects * sizeof(struct pipe_scissor_state))) {
+      memcpy(st->state.window_rects.rects, new_rects,
+             num_rects * sizeof(struct pipe_scissor_state));
+      changed = true;
+   }
+   if (st->state.window_rects.num != num_rects) {
+      st->state.window_rects.num = num_rects;
+      changed = true;
+   }
+   if (st->state.window_rects.include != include) {
+      st->state.window_rects.include = include;
+      changed = true;
+   }
+   if (changed)
+      st->pipe->set_window_rectangles(
+            st->pipe, include, num_rects, new_rects);
+}
 
 const struct st_tracked_state st_update_scissor = {
    "st_update_scissor",					/* name */
@@ -108,3 +148,12 @@ const struct st_tracked_state st_update_scissor = {
    },
    update_scissor					/* update */
 };
+
+const struct st_tracked_state st_update_window_rectangles = {
+   "st_update_window_rectangles",			/* name */
+   {							/* dirty */
+      (_NEW_SCISSOR | _NEW_BUFFERS),			/* mesa */
+      0,						/* st */
+   },
+   update_window_rectangles				/* update */
+};