diff options
Diffstat (limited to 'libkms++/framebuffer.cpp')
| -rw-r--r-- | libkms++/framebuffer.cpp | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/libkms++/framebuffer.cpp b/libkms++/framebuffer.cpp new file mode 100644 index 0000000..5382a6f --- /dev/null +++ b/libkms++/framebuffer.cpp @@ -0,0 +1,167 @@ + +#include <cstring> +#include <stdexcept> +#include <sys/mman.h> +#include <xf86drm.h> +#include <xf86drmMode.h> +#include <drm_fourcc.h> +#include <drm.h> +#include <drm_mode.h> + +#include "kms++.h" +#include "utils/testpat.h" + +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) + +namespace kms +{ + +Framebuffer::Framebuffer(Card &card, uint32_t width, uint32_t height, const char* fourcc) + :DrmObject(card, DRM_MODE_OBJECT_FB) +{ + uint32_t a, b, c, d; + a = fourcc[0]; + b = fourcc[1]; + c = fourcc[2]; + d = fourcc[3]; + + uint32_t code = ((uint32_t)(a) | ((uint32_t)(b) << 8) | ((uint32_t)(c) << 16) | ((uint32_t)(d) << 24)); + + Create(width, height, code); +} + +Framebuffer::~Framebuffer() +{ + Destroy(); +} + +void Framebuffer::print_short() const +{ + printf("Framebuffer %d\n", id()); +} + +struct FormatPlaneInfo +{ + uint8_t bitspp; /* bits per (macro) pixel */ + uint8_t xsub; + uint8_t ysub; +}; + +struct FormatInfo +{ + uint32_t format; + uint8_t num_planes; + struct FormatPlaneInfo planes[4]; +}; + +static const FormatInfo format_info_array[] = { + /* YUV packed */ + { DRM_FORMAT_UYVY, 1, { { 32, 2, 1 } }, }, + { DRM_FORMAT_YUYV, 1, { { 32, 2, 1 } }, }, + /* YUV semi-planar */ + { DRM_FORMAT_NV12, 2, { { 8, 1, 1, }, { 16, 2, 2 } }, }, + /* RGB16 */ + { DRM_FORMAT_RGB565, 1, { { 16, 1, 1 } }, }, + /* RGB32 */ + { DRM_FORMAT_XRGB8888, 1, { { 32, 1, 1 } }, }, +}; + +static const FormatInfo& find_format(uint32_t format) +{ + for (uint i = 0; i < ARRAY_SIZE(format_info_array); ++i) { + if (format == format_info_array[i].format) + return format_info_array[i]; + } + + throw std::invalid_argument("foo"); +} + +void Framebuffer::Create(uint32_t width, uint32_t height, uint32_t format) +{ + int r; + + m_width = width; + m_height = height; + m_format = format; + + const FormatInfo& format_info = find_format(format); + + m_num_planes = format_info.num_planes; + + for (int i = 0; i < format_info.num_planes; ++i) { + const FormatPlaneInfo& pi = format_info.planes[i]; + FramebufferPlane& plane = m_planes[i]; + + /* create dumb buffer */ + struct drm_mode_create_dumb creq = drm_mode_create_dumb(); + creq.width = m_width / pi.xsub; + creq.height = m_height / pi.ysub; + creq.bpp = pi.bitspp; + r = drmIoctl(card().fd(), DRM_IOCTL_MODE_CREATE_DUMB, &creq); + if (r) + throw std::invalid_argument("foo"); + + plane.handle = creq.handle; + plane.stride = creq.pitch; + plane.size = creq.height * creq.pitch; + + /* + printf("buf %d: %dx%d, bitspp %d, stride %d, size %d\n", + i, creq.width, creq.height, pi->bitspp, plane->stride, plane->size); + */ + + /* prepare buffer for memory mapping */ + struct drm_mode_map_dumb mreq = drm_mode_map_dumb(); + mreq.handle = plane.handle; + r = drmIoctl(card().fd(), DRM_IOCTL_MODE_MAP_DUMB, &mreq); + if (r) + throw std::invalid_argument("foo"); + + /* perform actual memory mapping */ + m_planes[i].map = (uint8_t *)mmap(0, plane.size, PROT_READ | PROT_WRITE, MAP_SHARED, + card().fd(), mreq.offset); + if (plane.map == MAP_FAILED) + throw std::invalid_argument("foo"); + + /* clear the framebuffer to 0 */ + memset(plane.map, 0, plane.size); + } + + /* create framebuffer object for the dumb-buffer */ + uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle }; + uint32_t pitches[4] = { m_planes[0].stride, m_planes[1].stride }; + uint32_t offsets[4] = { 0 }; + uint32_t id; + r = drmModeAddFB2(card().fd(), m_width, m_height, format, + bo_handles, pitches, offsets, &id, 0); + if (r) + throw std::invalid_argument("foo"); + + m_id = id; +} + +void Framebuffer::Destroy() +{ + /* delete framebuffer */ + drmModeRmFB(card().fd(), id()); + + for (uint i = 0; i < m_num_planes; ++i) { + FramebufferPlane& plane = m_planes[i]; + + /* unmap buffer */ + munmap(plane.map, plane.size); + + /* delete dumb buffer */ + struct drm_mode_destroy_dumb dreq = drm_mode_destroy_dumb(); + dreq.handle = plane.handle; + drmIoctl(card().fd(), DRM_IOCTL_MODE_DESTROY_DUMB, &dreq); + + } +} + +void Framebuffer::clear() +{ + for (unsigned i = 0; i < m_num_planes; ++i) + memset(m_planes[i].map, 0, m_planes[i].size); +} +} |