Mercurial > hg > Members > e085722 > Cerium
comparison Renderer/Engine/ps3fb/cp_fb.cc @ 0:04e28d8d3c6f
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author | Daiki KINJYO <e085722@ie.u-ryukyu.ac.jp> |
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date | Mon, 08 Nov 2010 01:23:25 +0900 |
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1 // cp_fb.c | |
2 // | |
3 // Copyright (c) 2006, Mike Acton <macton@cellperformance.com> | |
4 // | |
5 // Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated | |
6 // documentation files (the "Software"), to deal in the Software without restriction, including without | |
7 // limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | |
8 // the Software, and to permit persons to whom the Software is furnished to do so, subject to the following | |
9 // conditions: | |
10 // | |
11 // The above copyright notice and this permission notice shall be included in all copies or substantial | |
12 // portions of the Software. | |
13 // | |
14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT | |
15 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO | |
16 // EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN | |
17 // AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE | |
18 // OR OTHER DEALINGS IN THE SOFTWARE. | |
19 | |
20 // NOTES: | |
21 // From Geert Uytterhoeven 2007-01-26 04:50:44, | |
22 // http://patchwork.ozlabs.org/linuxppc/patch?id=9143 | |
23 // | |
24 // "As the actual graphics hardware cannot be accessed directly by Linux, | |
25 // ps3fb uses a virtual frame buffer in main memory. The actual screen image is | |
26 // copied to graphics memory by the GPU on every vertical blank, by making a | |
27 // hypervisor call." | |
28 // | |
29 | |
30 #include <stdio.h> | |
31 #include <stdlib.h> | |
32 #include <unistd.h> | |
33 #include <fcntl.h> | |
34 #include <getopt.h> | |
35 #include <string.h> | |
36 #include <errno.h> | |
37 #include <stdint.h> | |
38 #include <sys/ioctl.h> | |
39 #include <sys/mman.h> | |
40 #include <linux/fb.h> | |
41 #include <sys/time.h> | |
42 #include <asm/ps3fb.h> | |
43 #include <linux/vt.h> | |
44 #include <linux/kd.h> | |
45 #include "cp_fb.h" | |
46 | |
47 static inline const char* | |
48 select_error_str( int existing_error, const char* const existing_error_str, int new_error, const char* const new_error_str ) | |
49 { | |
50 // Only report the first error found - any error that follows is probably just a cascading effect. | |
51 const char* error_str = (char*)( (~(intptr_t)existing_error & (intptr_t)new_error & (intptr_t)new_error_str) | |
52 | ((intptr_t)existing_error & (intptr_t)existing_error_str) ); | |
53 | |
54 return (error_str); | |
55 } | |
56 | |
57 int | |
58 cp_fb_open( cp_fb* const restrict fb ) | |
59 { | |
60 const char* error_str = NULL; | |
61 int error = 0; | |
62 | |
63 // Open framebuffer device | |
64 | |
65 const int fb_fd = open( "/dev/fb0", O_RDWR ); | |
66 const int open_fb_error = (fb_fd >> ((sizeof(int)<<3)-1)); | |
67 const char* open_fb_error_str = "Could not open /dev/fb0. Check permissions."; | |
68 | |
69 error_str = select_error_str( error, error_str, open_fb_error, open_fb_error_str ); | |
70 error = error | open_fb_error; | |
71 | |
72 // Check for vsync | |
73 | |
74 struct fb_vblank vblank; | |
75 | |
76 const int get_vblank_error = ioctl(fb_fd, FBIOGET_VBLANK, (unsigned long)&vblank); | |
77 const char* get_vblank_error_str = "Could not get vblank info (FBIOGET_VBLANK)"; | |
78 | |
79 error_str = select_error_str( error, error_str, get_vblank_error, get_vblank_error_str ); | |
80 error = error | get_vblank_error; | |
81 | |
82 const int has_vsync = vblank.flags & FB_VBLANK_HAVE_VSYNC; | |
83 const int has_vsync_error = (~(-has_vsync|has_vsync))>>((sizeof(int)<<3)-1); | |
84 const char* has_vsync_error_str = "No vsync available (FB_VBLANK_HAVE_VSYNC)"; | |
85 | |
86 error_str = select_error_str( error, error_str, has_vsync_error, has_vsync_error_str ); | |
87 error = error | has_vsync_error; | |
88 | |
89 // Get screen resolution and frame count | |
90 | |
91 struct ps3fb_ioctl_res res; | |
92 | |
93 const int screeninfo_error = ioctl(fb_fd, PS3FB_IOCTL_SCREENINFO, (unsigned long)&res); | |
94 const char* screeninfo_error_str = "Could not get screen info (PS3_IOCTL_SCREENINFO)"; | |
95 | |
96 error_str = select_error_str( error, error_str, screeninfo_error, screeninfo_error_str ); | |
97 error = error | screeninfo_error; | |
98 | |
99 const int has_at_least_double_buffer = (res.num_frames - 2) >> ((sizeof(res.num_frames)<<3)-1); | |
100 const int has_at_least_double_buffer_error = ~has_at_least_double_buffer; | |
101 const char* has_at_least_double_buffer_error_str = "Could not get screen info (PS3_IOCTL_SCREENINFO)"; | |
102 | |
103 error_str = select_error_str( error, error_str, has_at_least_double_buffer_error, has_at_least_double_buffer_error_str ); | |
104 error = error | has_at_least_double_buffer_error; | |
105 | |
106 const uint32_t bpp = 4; // This is fixed for PS3 fb, and there's not a test for it. | |
107 const uint32_t frame_size = res.xres * res.yres * bpp; | |
108 const uint32_t double_buffer_frame_size = frame_size * 2; | |
109 | |
110 // const uint32_t frame_top_margin_size = res.xres * res.yoff * bpp; | |
111 // const uint32_t frame_bottom_margin_size = frame_top_margin_size; | |
112 // const uint32_t frame_size = frame_full_size; /* - ( frame_top_margin_size + frame_bottom_margin_size ); */ | |
113 // const uint32_t double_buffer_frame_size = frame_size * 2; | |
114 | |
115 const uintptr_t fb_addr = (uintptr_t)mmap(NULL, double_buffer_frame_size, PROT_READ|PROT_WRITE, MAP_SHARED, fb_fd, 0); | |
116 const int fb_mmap_error = fb_addr >> ((sizeof(uintptr_t)<<3)-1); | |
117 const char* fb_mmap_error_str = "Could not get mmap frame buffer"; | |
118 | |
119 error_str = select_error_str( error, error_str, fb_mmap_error, fb_mmap_error_str ); | |
120 error = error | fb_mmap_error; | |
121 | |
122 // Take control of frame buffer from kernel | |
123 ioctl(fb_fd, PS3FB_IOCTL_ON, 0); | |
124 | |
125 // yoff is the number of lines that cannot be copied to the CRT before the vblank. For the most part this represents | |
126 // unusable frame buffer space. While it is possible to draw to the area if you draw in the opposite frame buffer's | |
127 // offset space, which will (due to poor draw timing by ps3fb) be the thing that is actually drawn, it's very | |
128 // difficult to work with in practice. So: | |
129 // | |
130 // (1) The y offset area will be treated as "off limits". | |
131 // (2) An equivalent border will be created at the bottom, so the frame looks balanced even though it is | |
132 // not entirely full screen. | |
133 | |
134 // xoff is the number of lines that cannot be copied to the CRT before the hblank. | |
135 // Similar to the y offset space, the x offset space is displayed on the wrong (previous) line. So: | |
136 // | |
137 // (1) The x offset area will be treated as "off limits". | |
138 // (2) An equivalent border will be created at the right, so the frame looks balanced even though it is | |
139 // not entirely full screen. | |
140 | |
141 uintptr_t draw_start_addr = fb_addr; | |
142 uintptr_t draw_next_addr = draw_start_addr + ( res.yres * res.xres * bpp ); | |
143 uintptr_t drawable_h = res.yres - ( 2 * res.yoff ); | |
144 uintptr_t drawable_w = res.xres - ( 2 * res.xoff ); | |
145 | |
146 // xoff is the number of lines that cannot be copied to the CRT before the hblank. This area is much easier to use. | |
147 // Similar to the y offset space, the x offset space is displayed on the wrong (previous) line. So: | |
148 // In principle, it is possible to steal back the x offset space by shifting back the line address to the | |
149 // start of the border of the previous line. Like so: | |
150 // | |
151 // (1) One additional line will be taken from the height so the a complete horizontal line can be started | |
152 // early. | |
153 // (2) The frame buffer address returned in cp_fb will be offset by (xres-xoff) in order for the remaining | |
154 // space to represent a rectangular area of drawable memory. | |
155 // | |
156 // i.e. | |
157 // uintptr_t draw_start_addr = fb_addr + ( ( res.xres - res.xoff ) * bpp ); | |
158 // uintptr_t draw_next_addr = draw_start_addr + ( res.yres * res.xres * bpp ); | |
159 // uintptr_t drawable_h = res.yres - 1 - ( 2 * res.yoff ); | |
160 // uintptr_t drawable_w = res.xres; | |
161 // | |
162 // But I wouldn't recommend it, since on some CRTs the effect of this would be that the frame does not appear | |
163 // square. | |
164 | |
165 fb->stride = res.xres; | |
166 fb->w = drawable_w; | |
167 fb->h = drawable_h; | |
168 fb->fd = fb_fd; | |
169 fb->start_addr = fb_addr; | |
170 fb->size = double_buffer_frame_size; | |
171 fb->draw_addr[0] = draw_start_addr; | |
172 fb->draw_addr[1] = draw_next_addr; | |
173 | |
174 // Clear out the whole buffer. Any unused space is black. It's also convinient to start with a cleared frame | |
175 // buffer for the user. | |
176 | |
177 memset((void*)fb_addr, 0x00, double_buffer_frame_size ); | |
178 | |
179 return (error); | |
180 } | |
181 | |
182 void | |
183 cp_fb_close( const cp_fb* const restrict fb ) | |
184 { | |
185 // Give frame buffer control back to the kernel | |
186 ioctl(fb->fd, PS3FB_IOCTL_OFF, 0); | |
187 | |
188 munmap( (void*)fb->start_addr, fb->size ); | |
189 | |
190 close(fb->fd); | |
191 } | |
192 | |
193 void | |
194 cp_fb_wait_vsync( cp_fb* const restrict fb ) | |
195 { | |
196 unsigned long crt = 0; | |
197 | |
198 ioctl(fb->fd, FBIO_WAITFORVSYNC, &crt ); | |
199 } | |
200 | |
201 void | |
202 cp_fb_flip( cp_fb* const restrict fb, unsigned long field_ndx ) | |
203 { | |
204 ioctl(fb->fd, PS3FB_IOCTL_FSEL, &field_ndx ); | |
205 } |