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