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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       float 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    update_viewport					/* update */
     87 };
     88