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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28.  
  29. #include "main/context.h"
  30. #include "main/viewport.h"
  31. #include "st_context.h"
  32. #include "st_atom.h"
  33. #include "pipe/p_context.h"
  34. #include "cso_cache/cso_context.h"
  35.  
  36. /**
  37.  * Update the viewport transformation matrix.  Depends on:
  38.  *  - viewport pos/size
  39.  *  - depthrange
  40.  *  - window pos/size or FBO size
  41.  */
  42. static void
  43. update_viewport( struct st_context *st )
  44. {
  45.    struct gl_context *ctx = st->ctx;
  46.    GLfloat yScale, yBias;
  47.    unsigned i;
  48.    /* _NEW_BUFFERS
  49.     */
  50.    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
  51.       /* Drawing to a window.  The corresponding gallium surface uses
  52.        * Y=0=TOP but OpenGL is Y=0=BOTTOM.  So we need to invert the viewport.
  53.        */
  54.       yScale = -1;
  55.       yBias = (GLfloat)ctx->DrawBuffer->Height;
  56.    }
  57.    else {
  58.       /* Drawing to an FBO where Y=0=BOTTOM, like OpenGL - don't invert */
  59.       yScale = 1.0;
  60.       yBias = 0.0;
  61.    }
  62.  
  63.    /* _NEW_VIEWPORT
  64.     */
  65.    for (i = 0; i < ctx->Const.MaxViewports; i++)
  66.    {
  67.       double scale[3], translate[3];
  68.       _mesa_get_viewport_xform(ctx, i, scale, translate);
  69.  
  70.       st->state.viewport[i].scale[0] = scale[0];
  71.       st->state.viewport[i].scale[1] = scale[1] * yScale;
  72.       st->state.viewport[i].scale[2] = scale[2];
  73.  
  74.       st->state.viewport[i].translate[0] = translate[0];
  75.       st->state.viewport[i].translate[1] = translate[1] * yScale + yBias;
  76.       st->state.viewport[i].translate[2] = translate[2];
  77.    }
  78.  
  79.    cso_set_viewport(st->cso_context, &st->state.viewport[0]);
  80.    if (ctx->Const.MaxViewports > 1)
  81.       st->pipe->set_viewport_states(st->pipe, 1, ctx->Const.MaxViewports - 1, &st->state.viewport[1]);
  82. }
  83.  
  84.  
  85. const struct st_tracked_state st_update_viewport = {
  86.    "st_update_viewport",                                /* name */
  87.    {                                                    /* dirty */
  88.       _NEW_BUFFERS | _NEW_VIEWPORT,                     /* mesa */
  89.       0,                                                /* st */
  90.    },
  91.    update_viewport                                      /* update */
  92. };
  93.