src/mesa/state_tracker/st_atom_viewport.c

   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 "st_util.h"
  34 #include "pipe/p_context.h"
  35 #include "cso_cache/cso_context.h"
  36
  37 static enum pipe_viewport_swizzle
  38 viewport_swizzle_from_glenum(GLenum16 swizzle)
  39 {
  40    return swizzle - GL_VIEWPORT_SWIZZLE_POSITIVE_X_NV;
  41 }
  42
  43 /**
  44  * Update the viewport transformation matrix.  Depends on:
  45  *  - viewport pos/size
  46  *  - depthrange
  47  *  - window pos/size or FBO size
  48  */
  49 void
  50 st_update_viewport( struct st_context *st )
  51 {
  52    struct gl_context *ctx = st->ctx;
  53    unsigned i;
  54
  55    /* _NEW_VIEWPORT
  56     */
  57    for (i = 0; i < st->state.num_viewports; i++) {
  58       float *scale = st->state.viewport[i].scale;
  59       float *translate = st->state.viewport[i].translate;
  60
  61       _mesa_get_viewport_xform(ctx, i, scale, translate);
  62
  63       /* _NEW_BUFFERS */
  64       /* Drawing to a window where the coordinate system is upside down. */
  65       if (st->state.fb_orientation == Y_0_TOP) {
  66          scale[1] *= -1;
  67          translate[1] = st->state.fb_height - translate[1];
  68       }
  69
  70       st->state.viewport[i].swizzle_x = viewport_swizzle_from_glenum(ctx->ViewportArray[i].SwizzleX);
  71       st->state.viewport[i].swizzle_y = viewport_swizzle_from_glenum(ctx->ViewportArray[i].SwizzleY);
  72       st->state.viewport[i].swizzle_z = viewport_swizzle_from_glenum(ctx->ViewportArray[i].SwizzleZ);
  73       st->state.viewport[i].swizzle_w = viewport_swizzle_from_glenum(ctx->ViewportArray[i].SwizzleW);
  74    }
  75
  76    cso_set_viewport(st->cso_context, &st->state.viewport[0]);
  77
  78    if (st->state.num_viewports > 1) {
  79       struct pipe_context *pipe = st->pipe;
  80
  81       pipe->set_viewport_states(pipe, 1, st->state.num_viewports - 1,
  82                                 &st->state.viewport[1]);
  83    }
  84 }