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 * Authors:
30 * Keith Whitwell <keithw@vmware.com>
31 */
32
33
34 #include "main/macros.h"
35 #include "main/framebuffer.h"
36 #include "st_context.h"
37 #include "pipe/p_context.h"
38 #include "st_atom.h"
39 #include "st_util.h"
40
41
42 /**
43 * Scissor depends on the scissor box, and the framebuffer dimensions.
44 */
45 void
st_update_scissor(struct st_context * st)46 st_update_scissor( struct st_context *st )
47 {
48 struct pipe_scissor_state scissor[PIPE_MAX_VIEWPORTS];
49 const struct gl_context *ctx = st->ctx;
50 const struct gl_framebuffer *fb = ctx->DrawBuffer;
51 const unsigned int fb_width = _mesa_geometric_width(fb);
52 const unsigned int fb_height = _mesa_geometric_height(fb);
53 GLint miny, maxy;
54 unsigned i;
55 bool changed = false;
56
57 if (!ctx->Scissor.EnableFlags)
58 return;
59
60 for (i = 0 ; i < st->state.num_viewports; i++) {
61 scissor[i].minx = 0;
62 scissor[i].miny = 0;
63 scissor[i].maxx = fb_width;
64 scissor[i].maxy = fb_height;
65
66 if (ctx->Scissor.EnableFlags & (1 << i)) {
67 /* need to be careful here with xmax or ymax < 0 */
68 GLint xmax = MAX2(0, ctx->Scissor.ScissorArray[i].X + ctx->Scissor.ScissorArray[i].Width);
69 GLint ymax = MAX2(0, ctx->Scissor.ScissorArray[i].Y + ctx->Scissor.ScissorArray[i].Height);
70
71 if (ctx->Scissor.ScissorArray[i].X > (GLint)scissor[i].minx)
72 scissor[i].minx = ctx->Scissor.ScissorArray[i].X;
73 if (ctx->Scissor.ScissorArray[i].Y > (GLint)scissor[i].miny)
74 scissor[i].miny = ctx->Scissor.ScissorArray[i].Y;
75
76 if (xmax < (GLint) scissor[i].maxx)
77 scissor[i].maxx = xmax;
78 if (ymax < (GLint) scissor[i].maxy)
79 scissor[i].maxy = ymax;
80
81 /* check for null space */
82 if (scissor[i].minx >= scissor[i].maxx || scissor[i].miny >= scissor[i].maxy)
83 scissor[i].minx = scissor[i].miny = scissor[i].maxx = scissor[i].maxy = 0;
84 }
85
86 /* Now invert Y if needed.
87 * Gallium drivers use the convention Y=0=top for surfaces.
88 */
89 if (st->state.fb_orientation == Y_0_TOP) {
90 miny = fb->Height - scissor[i].maxy;
91 maxy = fb->Height - scissor[i].miny;
92 scissor[i].miny = miny;
93 scissor[i].maxy = maxy;
94 }
95
96 if (memcmp(&scissor[i], &st->state.scissor[i], sizeof(scissor[0])) != 0) {
97 /* state has changed */
98 st->state.scissor[i] = scissor[i]; /* struct copy */
99 changed = true;
100 }
101 }
102
103 if (changed) {
104 struct pipe_context *pipe = st->pipe;
105
106 pipe->set_scissor_states(pipe, 0, st->state.num_viewports, scissor);
107 }
108 }
109
110 void
st_update_window_rectangles(struct st_context * st)111 st_update_window_rectangles(struct st_context *st)
112 {
113 struct pipe_scissor_state new_rects[PIPE_MAX_WINDOW_RECTANGLES];
114 const struct gl_context *ctx = st->ctx;
115 const struct gl_scissor_attrib *scissor = &ctx->Scissor;
116 unsigned i;
117 bool changed = false;
118 unsigned num_rects = scissor->NumWindowRects;
119 bool include = scissor->WindowRectMode == GL_INCLUSIVE_EXT;
120
121 if (ctx->DrawBuffer == ctx->WinSysDrawBuffer) {
122 num_rects = 0;
123 include = false;
124 }
125 for (i = 0; i < num_rects; i++) {
126 const struct gl_scissor_rect *rect = &scissor->WindowRects[i];
127 new_rects[i].minx = MAX2(rect->X, 0);
128 new_rects[i].miny = MAX2(rect->Y, 0);
129 new_rects[i].maxx = MAX2(rect->X + rect->Width, 0);
130 new_rects[i].maxy = MAX2(rect->Y + rect->Height, 0);
131 }
132 if (num_rects > 0 && memcmp(new_rects, st->state.window_rects.rects,
133 num_rects * sizeof(struct pipe_scissor_state))) {
134 memcpy(st->state.window_rects.rects, new_rects,
135 num_rects * sizeof(struct pipe_scissor_state));
136 changed = true;
137 }
138 if (st->state.window_rects.num != num_rects) {
139 st->state.window_rects.num = num_rects;
140 changed = true;
141 }
142 if (st->state.window_rects.include != include) {
143 st->state.window_rects.include = include;
144 changed = true;
145 }
146 if (changed)
147 st->pipe->set_window_rectangles(
148 st->pipe, include, num_rects, new_rects);
149 }
150