2 #include <cstring>
3 #include <stdexcept>
4 #include <sys/mman.h>
5 #include <xf86drm.h>
6 #include <xf86drmMode.h>
7 #include <fcntl.h>
8 #include <unistd.h>
9 #include <drm_fourcc.h>
10 #include <drm.h>
11 #include <drm_mode.h>
13 #include "kms++.h"
15 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
17 using namespace std;
19 namespace kms
20 {
22 DumbFramebuffer::DumbFramebuffer(Card &card, uint32_t width, uint32_t height, const string& fourcc)
23 :DumbFramebuffer(card, width, height, FourCCToPixelFormat(fourcc))
24 {
25 }
27 DumbFramebuffer::DumbFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format)
28 :Framebuffer(card, width, height), m_format(format)
29 {
30 Create();
31 }
33 DumbFramebuffer::~DumbFramebuffer()
34 {
35 Destroy();
36 }
38 struct FormatPlaneInfo
39 {
40 uint8_t bitspp; /* bits per (macro) pixel */
41 uint8_t xsub;
42 uint8_t ysub;
43 };
45 struct FormatInfo
46 {
47 uint8_t num_planes;
48 struct FormatPlaneInfo planes[4];
49 };
51 static const map<PixelFormat, FormatInfo> format_info_array = {
52 /* YUV packed */
53 { PixelFormat::UYVY, { 1, { { 32, 2, 1 } }, } },
54 { PixelFormat::YUYV, { 1, { { 32, 2, 1 } }, } },
55 { PixelFormat::YVYU, { 1, { { 32, 2, 1 } }, } },
56 { PixelFormat::VYUY, { 1, { { 32, 2, 1 } }, } },
57 /* YUV semi-planar */
58 { PixelFormat::NV12, { 2, { { 8, 1, 1, }, { 16, 2, 2 } }, } },
59 { PixelFormat::NV21, { 2, { { 8, 1, 1, }, { 16, 2, 2 } }, } },
60 /* RGB16 */
61 { PixelFormat::RGB565, { 1, { { 16, 1, 1 } }, } },
62 /* RGB32 */
63 { PixelFormat::XRGB8888, { 1, { { 32, 1, 1 } }, } },
64 { PixelFormat::XBGR8888, { 1, { { 32, 1, 1 } }, } },
65 { PixelFormat::ARGB8888, { 1, { { 32, 1, 1 } }, } },
66 { PixelFormat::ABGR8888, { 1, { { 32, 1, 1 } }, } },
67 };
69 void DumbFramebuffer::Create()
70 {
71 int r;
73 const FormatInfo& format_info = format_info_array.at(m_format);
75 m_num_planes = format_info.num_planes;
77 for (int i = 0; i < format_info.num_planes; ++i) {
78 const FormatPlaneInfo& pi = format_info.planes[i];
79 FramebufferPlane& plane = m_planes[i];
81 /* create dumb buffer */
82 struct drm_mode_create_dumb creq = drm_mode_create_dumb();
83 creq.width = width() / pi.xsub;
84 creq.height = height() / pi.ysub;
85 creq.bpp = pi.bitspp;
86 r = drmIoctl(card().fd(), DRM_IOCTL_MODE_CREATE_DUMB, &creq);
87 if (r)
88 throw invalid_argument(string("DRM_IOCTL_MODE_CREATE_DUMB failed") + strerror(errno));
90 plane.handle = creq.handle;
91 plane.stride = creq.pitch;
92 plane.size = creq.height * creq.pitch;
93 plane.offset = 0;
94 plane.map = 0;
95 plane.prime_fd = -1;
96 }
98 /* create framebuffer object for the dumb-buffer */
99 uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle };
100 uint32_t pitches[4] = { m_planes[0].stride, m_planes[1].stride };
101 uint32_t offsets[4] = { m_planes[0].offset, m_planes[1].offset };
102 uint32_t id;
103 r = drmModeAddFB2(card().fd(), width(), height(), (uint32_t)format(),
104 bo_handles, pitches, offsets, &id, 0);
105 if (r)
106 throw invalid_argument(string("drmModeAddFB2 failed: ") + strerror(errno));
108 set_id(id);
109 }
111 void DumbFramebuffer::Destroy()
112 {
113 /* delete framebuffer */
114 drmModeRmFB(card().fd(), id());
116 for (uint i = 0; i < m_num_planes; ++i) {
117 FramebufferPlane& plane = m_planes[i];
119 /* unmap buffer */
120 if (plane.map)
121 munmap(plane.map, plane.size);
123 /* delete dumb buffer */
124 struct drm_mode_destroy_dumb dreq = drm_mode_destroy_dumb();
125 dreq.handle = plane.handle;
126 drmIoctl(card().fd(), DRM_IOCTL_MODE_DESTROY_DUMB, &dreq);
127 if (plane.prime_fd >= 0)
128 ::close(plane.prime_fd);
129 }
130 }
132 uint8_t* DumbFramebuffer::map(unsigned plane)
133 {
134 FramebufferPlane& p = m_planes[plane];
136 if (p.map)
137 return p.map;
139 /* prepare buffer for memory mapping */
140 struct drm_mode_map_dumb mreq = drm_mode_map_dumb();
141 mreq.handle = p.handle;
142 int r = drmIoctl(card().fd(), DRM_IOCTL_MODE_MAP_DUMB, &mreq);
143 if (r)
144 throw invalid_argument(string("DRM_IOCTL_MODE_MAP_DUMB failed") + strerror(errno));
146 /* perform actual memory mapping */
147 p.map = (uint8_t *)mmap(0, p.size, PROT_READ | PROT_WRITE, MAP_SHARED,
148 card().fd(), mreq.offset);
149 if (p.map == MAP_FAILED)
150 throw invalid_argument(string("mmap failed: ") + strerror(errno));
152 return p.map;
153 }
155 int DumbFramebuffer::prime_fd(unsigned int plane)
156 {
157 if (m_planes[plane].prime_fd >= 0)
158 return m_planes[plane].prime_fd;
160 int r = drmPrimeHandleToFD(card().fd(), m_planes[plane].handle,
161 DRM_CLOEXEC, &m_planes[plane].prime_fd);
162 if (r)
163 throw std::runtime_error("drmPrimeHandleToFD failed\n");
165 return m_planes[plane].prime_fd;
166 }
168 }