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
viewport_swizzle_from_glenum(GLenum16 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
st_update_viewport(struct st_context * st)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 }
85