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 <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>

1 files changed, 51 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_scissor.c b/src/mesa/state_tracker/st_scissor.c
new file mode 100644
index 00000000000..40b8ecc4d26
--- /dev/null
+++ b/src/mesa/state_tracker/st_scissor.c
@@ -0,0 +1,51 @@
+/**************************************************************************
+ *
+ * Copyright 2016 Ilia Mirkin
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "main/macros.h"
+#include "main/mtypes.h"
+#include "pipe/p_state.h"
+
+#include "st_scissor.h"
+
+void
+st_window_rectangles_to_blit(const struct gl_context *ctx,
+                             struct pipe_blit_info *blit)
+{
+   unsigned i;
+
+   blit->num_window_rectangles = ctx->Scissor.NumWindowRects;
+   blit->window_rectangle_include =
+      ctx->Scissor.WindowRectMode == GL_INCLUSIVE_EXT;
+   for (i = 0; i < blit->num_window_rectangles; i++) {
+      const struct gl_scissor_rect *src_rect = &ctx->Scissor.WindowRects[i];
+      struct pipe_scissor_state *dst_rect = &blit->window_rectangles[i];
+      dst_rect->minx = MAX2(src_rect->X, 0);
+      dst_rect->miny = MAX2(src_rect->Y, 0);
+      dst_rect->maxx = MAX2(src_rect->X + src_rect->Width, 0);
+      dst_rect->maxy = MAX2(src_rect->Y + src_rect->Height, 0);
+   }
+}