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