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5564 serge 1 
/**************************************************************************
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 *
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 * Copyright 2007 VMware, Inc.
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 * All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the
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 * "Software"), to deal in the Software without restriction, including
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 * without limitation the rights to use, copy, modify, merge, publish,
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 * distribute, sub license, and/or sell copies of the Software, and to
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 * permit persons to whom the Software is furnished to do so, subject to
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 * the following conditions:
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 *
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 * The above copyright notice and this permission notice (including the
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 * next paragraph) shall be included in all copies or substantial portions
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 * of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 *
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 **************************************************************************/
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#include "main/context.h"
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#include "main/viewport.h"
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#include "st_context.h"
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#include "st_atom.h"
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#include "pipe/p_context.h"
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#include "cso_cache/cso_context.h"
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/**
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 * Update the viewport transformation matrix.  Depends on:
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 *  - viewport pos/size
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 *  - depthrange
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 *  - window pos/size or FBO size
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 */
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static void
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update_viewport( struct st_context *st )
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{
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   struct gl_context *ctx = st->ctx;
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   GLfloat yScale, yBias;
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   unsigned i;
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   /* _NEW_BUFFERS
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    */
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   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
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      /* Drawing to a window.  The corresponding gallium surface uses
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       * Y=0=TOP but OpenGL is Y=0=BOTTOM.  So we need to invert the viewport.
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       */
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      yScale = -1;
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      yBias = (GLfloat)ctx->DrawBuffer->Height;
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   }
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   else {
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      /* Drawing to an FBO where Y=0=BOTTOM, like OpenGL - don't invert */
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      yScale = 1.0;
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      yBias = 0.0;
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   }
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   /* _NEW_VIEWPORT
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    */
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   for (i = 0; i < ctx->Const.MaxViewports; i++)
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   {
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      double scale[3], translate[3];
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      _mesa_get_viewport_xform(ctx, i, scale, translate);
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      st->state.viewport[i].scale[0] = scale[0];
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      st->state.viewport[i].scale[1] = scale[1] * yScale;
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      st->state.viewport[i].scale[2] = scale[2];
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      st->state.viewport[i].translate[0] = translate[0];
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      st->state.viewport[i].translate[1] = translate[1] * yScale + yBias;
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      st->state.viewport[i].translate[2] = translate[2];
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   }
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   cso_set_viewport(st->cso_context, &st->state.viewport[0]);
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   if (ctx->Const.MaxViewports > 1)
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      st->pipe->set_viewport_states(st->pipe, 1, ctx->Const.MaxViewports - 1, &st->state.viewport[1]);
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}
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const struct st_tracked_state st_update_viewport = {
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   "st_update_viewport",				/* name */
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   {							/* dirty */
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      _NEW_BUFFERS | _NEW_VIEWPORT,			/* mesa */
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      0,						/* st */
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   },
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   update_viewport					/* update */
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};