mesa: Refactor viewport transform computation.

[mesa.git] / src / mesa / state_tracker / st_atom_viewport.c

diff --git a/src/mesa/state_tracker/st_atom_viewport.c b/src/mesa/state_tracker/st_atom_viewport.c
index ac91f628aab5f6095bfa45cd2c8a572c7a5b1687..5b992084bd5c8ef6951e8cecf69642eb6a73a986 100644 (file)
--- a/src/mesa/state_tracker/st_atom_viewport.c
+++ b/src/mesa/state_tracker/st_atom_viewport.c
@@ -1,6 +1,6 @@
 /**************************************************************************
  * 
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright 2007 VMware, Inc.
  * All Rights Reserved.
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -18,7 +18,7 @@
  * 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
+ * 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.
@@ -26,15 +26,12 @@
  **************************************************************************/
 
 
-#include "context.h"
-#include "colormac.h"
+#include "main/context.h"
+#include "main/viewport.h"
 #include "st_context.h"
-#include "pipe/p_context.h"
 #include "st_atom.h"
-
-
-
-
+#include "pipe/p_context.h"
+#include "cso_cache/cso_context.h"
 
 /**
  * Update the viewport transformation matrix.  Depends on:
@@ -42,76 +39,56 @@
  *  - depthrange
  *  - window pos/size or FBO size
  */
-static void update_viewport( struct st_context *st )
+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;
-
+   struct gl_context *ctx = st->ctx;
+   GLfloat yScale, yBias;
+   int i;
    /* _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
+   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
+      /* Drawing to a window.  The corresponding gallium surface uses
+       * Y=0=TOP but OpenGL is Y=0=BOTTOM.  So we need to invert the viewport.
+       */
+      yScale = -1;
+      yBias = (GLfloat)ctx->DrawBuffer->Height;
+   }
+   else {
+      /* Drawing to an FBO where Y=0=BOTTOM, like OpenGL - don't invert */
+      yScale = 1.0;
+      yBias = 0.0;
    }
 
+   /* _NEW_VIEWPORT 
+    */
+   for (i = 0; i < ctx->Const.MaxViewports; i++)
    {
-      /* _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 pipe_viewport_state vp;
-      
-      vp.scale[0] = half_width;
-      vp.scale[1] = half_height * yScale;
-      vp.scale[2] = half_depth;
-      vp.scale[3] = 1.0;
+      double scale[3], translate[3];
+      _mesa_get_viewport_xform(ctx, i, scale, translate);
 
-      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;
+      st->state.viewport[i].scale[0] = scale[0];
+      st->state.viewport[i].scale[1] = scale[1] * yScale;
+      st->state.viewport[i].scale[2] = scale[2];
+      st->state.viewport[i].scale[3] = 1.0;
 
-      if (memcmp(&vp, &st->state.viewport, sizeof(vp)) != 0) {
-        st->state.viewport = vp;
-        st->pipe->set_viewport_state(st->pipe, &vp);
-      }
+      st->state.viewport[i].translate[0] = translate[0];
+      st->state.viewport[i].translate[1] = translate[1] * yScale + yBias;
+      st->state.viewport[i].translate[2] = translate[2];
+      st->state.viewport[i].translate[3] = 0.0;
    }
+
+   cso_set_viewport(st->cso_context, &st->state.viewport[0]);
+   if (ctx->Const.MaxViewports > 1)
+      st->pipe->set_viewport_states(st->pipe, 1, ctx->Const.MaxViewports - 1, &st->state.viewport[1]);
 }
 
 
 const struct st_tracked_state st_update_viewport = {
-   .dirty = {
-      .mesa = _NEW_BUFFERS | _NEW_VIEWPORT,
-      .st = 0,
+   "st_update_viewport",                               /* name */
+   {                                                   /* dirty */
+      _NEW_BUFFERS | _NEW_VIEWPORT,                    /* mesa */
+      0,                                               /* st */
    },
-   .update = update_viewport
+   update_viewport                                     /* update */
 };