From 8e4a95a93d15a6707a29454cd47e10b08314cda2 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Thu, 24 May 2007 10:41:34 +0100
Subject: First version of the softpipe rasterizer.

This will flesh out to hopefully acheive 3 things:
	- New software rasterizer for mesa
	- New driver model for mesa & dri with much smaller drivers
	- The basis for the cell driver.

It's got a long way to go yet, but will at least run trivial/tri.c.
---
 src/mesa/softpipe/state_tracker/st_atom_viewport.c | 117 +++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 src/mesa/softpipe/state_tracker/st_atom_viewport.c

(limited to 'src/mesa/softpipe/state_tracker/st_atom_viewport.c')

diff --git a/src/mesa/softpipe/state_tracker/st_atom_viewport.c b/src/mesa/softpipe/state_tracker/st_atom_viewport.c
new file mode 100644
index 0000000000..af896e2e31
--- /dev/null
+++ b/src/mesa/softpipe/state_tracker/st_atom_viewport.c
@@ -0,0 +1,117 @@
+/**************************************************************************
+ * 
+ * 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 "context.h"
+#include "colormac.h"
+#include "st_context.h"
+#include "softpipe/sp_context.h"
+#include "st_atom.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;
+   const GLframebuffer *DrawBuffer = ctx->DrawBuffer;
+   GLfloat yScale = 1.0;
+   GLfloat yBias = 0.0;
+
+   /* _NEW_BUFFERS
+    */
+   if (DrawBuffer) {
+
+#if 0
+      if (DrawBuffer->Name) {
+	 /* User created FBO */
+	 struct st_renderbuffer *irb
+	    = st_renderbuffer(DrawBuffer->_ColorDrawBuffers[0][0]);
+	 if (irb && !irb->RenderToTexture) {
+	    /* y=0=top */
+	    yScale = -1.0;
+	    yBias = irb->Base.Height;
+	 }
+	 else {
+	    /* y=0=bottom */
+	    yScale = 1.0;
+	    yBias = 0.0;
+	 }
+      }
+      else 
+      {
+	 /* window buffer, y=0=top */
+	 yScale = -1.0;
+	 yBias = DrawBuffer->Height;
+      }
+#endif
+   }
+
+   {
+      /* _NEW_VIEWPORT 
+       */
+      GLfloat x = ctx->Viewport.X;
+      GLfloat y = ctx->Viewport.Y;
+      GLfloat z = ctx->Viewport.Near;
+      GLfloat half_width = ctx->Viewport.Width / 2.0;
+      GLfloat half_height = ctx->Viewport.Height / 2.0;
+      GLfloat half_depth = (ctx->Viewport.Far - ctx->Viewport.Near) / 2.0;
+
+      struct softpipe_viewport vp;
+      
+      vp.scale[0] = half_width;
+      vp.scale[1] = half_height * yScale;
+      vp.scale[2] = half_depth;
+      vp.scale[3] = 1.0;
+
+      vp.translate[0] = (half_width + x);
+      vp.translate[1] = (half_height + y) * yScale + yBias;
+      vp.translate[2] = (half_depth + z);
+      vp.translate[3] = 0.0;
+
+      if (memcmp(&vp, &st->state.viewport, sizeof(vp)) != 0) {
+	 st->state.viewport = vp;
+	 st->softpipe->set_viewport(st->softpipe, &vp);
+      }
+   }
+}
+
+
+const struct st_tracked_state st_update_viewport = {
+   .dirty = {
+      .mesa = _NEW_BUFFERS | _NEW_VIEWPORT,
+      .st = 0,
+   },
+   .update = update_viewport
+};
-- 
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