1 files changed, 91 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_atom_viewport.c b/src/mesa/state_tracker/st_atom_viewport.c
new file mode 100644
index 0000000000..27ec2eb033
--- /dev/null
+++ b/src/mesa/state_tracker/st_atom_viewport.c
@@ -0,0 +1,91 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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 TUNGSTEN GRAPHICS 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/context.h"
+#include "main/colormac.h"
+#include "st_context.h"
+#include "st_atom.h"
+#include "pipe/p_context.h"
+#include "cso_cache/cso_context.h"
+
+/**
+ * Update the viewport transformation matrix.  Depends on:
+ *  - viewport pos/size
+ *  - depthrange
+ *  - window pos/size or FBO size
+ */
+static void
+update_viewport( struct st_context *st )
+{
+   GLcontext *ctx = st->ctx;
+   GLfloat yScale, yBias;
+
+   /* _NEW_BUFFERS
+    */
+   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
+      yScale = -1;
+      yBias = (GLfloat)ctx->DrawBuffer->Height;
+   }
+   else {
+      yScale = 1.0;
+      yBias = 0.0;
+   }
+
+   /* _NEW_VIEWPORT 
+    */
+   {
+      GLfloat x = (GLfloat)ctx->Viewport.X;
+      GLfloat y = (GLfloat)ctx->Viewport.Y;
+      GLfloat z = ctx->Viewport.Near;
+      GLfloat half_width = (GLfloat)ctx->Viewport.Width / 2.0f;
+      GLfloat half_height = (GLfloat)ctx->Viewport.Height / 2.0f;
+      GLfloat half_depth = (GLfloat)(ctx->Viewport.Far - ctx->Viewport.Near) / 2.0f;
+      
+      st->state.viewport.scale[0] = half_width;
+      st->state.viewport.scale[1] = half_height * yScale;
+      st->state.viewport.scale[2] = half_depth;
+      st->state.viewport.scale[3] = 1.0;
+
+      st->state.viewport.translate[0] = half_width + x;
+      st->state.viewport.translate[1] = (half_height + y) * yScale + yBias;
+      st->state.viewport.translate[2] = half_depth + z;
+      st->state.viewport.translate[3] = 0.0;
+
+      cso_set_viewport(st->cso_context, &st->state.viewport);
+   }
+}
+
+
+const struct st_tracked_state st_update_viewport = {
+   "st_update_viewport",				/* name */
+   {							/* dirty */
+      _NEW_BUFFERS | _NEW_VIEWPORT,			/* mesa */
+      0,						/* st */
+   },
+   update_viewport					/* update */
+};