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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
  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 TUNGSTEN GRAPHICS 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 "st_context.h"
  31. #include "st_atom.h"
  32. #include "pipe/p_context.h"
  33. #include "cso_cache/cso_context.h"
  34.  
  35. /**
  36.  * Update the viewport transformation matrix.  Depends on:
  37.  *  - viewport pos/size
  38.  *  - depthrange
  39.  *  - window pos/size or FBO size
  40.  */
  41. static void
  42. update_viewport( struct st_context *st )
  43. {
  44.    struct gl_context *ctx = st->ctx;
  45.    GLfloat yScale, yBias;
  46.  
  47.    /* _NEW_BUFFERS
  48.     */
  49.    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
  50.       /* Drawing to a window.  The corresponding gallium surface uses
  51.        * Y=0=TOP but OpenGL is Y=0=BOTTOM.  So we need to invert the viewport.
  52.        */
  53.       yScale = -1;
  54.       yBias = (GLfloat)ctx->DrawBuffer->Height;
  55.    }
  56.    else {
  57.       /* Drawing to an FBO where Y=0=BOTTOM, like OpenGL - don't invert */
  58.       yScale = 1.0;
  59.       yBias = 0.0;
  60.    }
  61.  
  62.    /* _NEW_VIEWPORT
  63.     */
  64.    {
  65.       GLfloat x = (GLfloat)ctx->Viewport.X;
  66.       GLfloat y = (GLfloat)ctx->Viewport.Y;
  67.       GLfloat z = ctx->Viewport.Near;
  68.       GLfloat half_width = (GLfloat)ctx->Viewport.Width * 0.5f;
  69.       GLfloat half_height = (GLfloat)ctx->Viewport.Height * 0.5f;
  70.       GLfloat half_depth = (GLfloat)(ctx->Viewport.Far - ctx->Viewport.Near) * 0.5f;
  71.      
  72.       st->state.viewport.scale[0] = half_width;
  73.       st->state.viewport.scale[1] = half_height * yScale;
  74.       st->state.viewport.scale[2] = half_depth;
  75.       st->state.viewport.scale[3] = 1.0;
  76.  
  77.       st->state.viewport.translate[0] = half_width + x;
  78.       st->state.viewport.translate[1] = (half_height + y) * yScale + yBias;
  79.       st->state.viewport.translate[2] = half_depth + z;
  80.       st->state.viewport.translate[3] = 0.0;
  81.  
  82.       cso_set_viewport(st->cso_context, &st->state.viewport);
  83.    }
  84. }
  85.  
  86.  
  87. const struct st_tracked_state st_update_viewport = {
  88.    "st_update_viewport",                                /* name */
  89.    {                                                    /* dirty */
  90.       _NEW_BUFFERS | _NEW_VIEWPORT,                     /* mesa */
  91.       0,                                                /* st */
  92.    },
  93.    update_viewport                                      /* update */
  94. };
  95.