DRM应用程序进阶（atomic

2024-06-26 15:29| 来源: 网络整理| 查看: 265

前言

在上一篇《DRM应用程序进阶（atomic-crtc）》文章中，我们学习了如何通过libdrm的atomic接口实现modeseting的操作。本篇，我们将一起来学习如何通过atomic接口，来实现 drmModeSetPlane() 相同的操作。

Atomic Commit

plane update的atomic操作如下：

drmModeAtomicAddProperty(req, plane_id, property_crtc_id, crtc_id); drmModeAtomicAddProperty(req, plane_id, property_fb_id, fb_id); drmModeAtomicAddProperty(req, plane_id, property_crtc_x, crtc_x); drmModeAtomicAddProperty(req, plane_id, property_crtc_y, crtc_y); drmModeAtomicAddProperty(req, plane_id, property_crtc_w, crtc_w); drmModeAtomicAddProperty(req, plane_id, property_crtc_h, crtc_h); drmModeAtomicAddProperty(req, plane_id, property_src_x, src_x); drmModeAtomicAddProperty(req, plane_id, property_src_y, src_y); drmModeAtomicAddProperty(req, plane_id, property_src_w, src_w struct drm_mode_create_dumb create = {}; struct drm_mode_map_dumb map = {}; create.width = bo->width; create.height = bo->height; create.bpp = 32; drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &create); bo->pitch = create.pitch; bo->size = create.size; bo->handle = create.handle; drmModeAddFB(fd, bo->width, bo->height, 24, 32, bo->pitch, bo->handle, &bo->fb_id); map.handle = create.handle; drmIoctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &map); bo->vaddr = mmap(0, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, map.offset); memset(bo->vaddr, 0xff, bo->size); return 0; } static void modeset_destroy_fb(int fd, struct buffer_object *bo) { struct drm_mode_destroy_dumb destroy = {}; drmModeRmFB(fd, bo->fb_id); munmap(bo->vaddr, bo->size); destroy.handle = bo->handle; drmIoctl(fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy); } static uint32_t get_property_id(int fd, drmModeObjectProperties *props, const char *name) { drmModePropertyPtr property; uint32_t i, id = 0; for (i = 0; i count_props; i++) { property = drmModeGetProperty(fd, props->props[i]); if (!strcmp(property->name, name)) id = property->prop_id; drmModeFreeProperty(property); if (id) break; } return id; } int main(int argc, char **argv) { int fd; drmModeConnector *conn; drmModeRes *res; drmModePlaneRes *plane_res; drmModeObjectProperties *props; drmModeAtomicReq *req; uint32_t conn_id; uint32_t crtc_id; uint32_t plane_id; uint32_t blob_id; uint32_t property_crtc_id; uint32_t property_mode_id; uint32_t property_active; uint32_t property_fb_id; uint32_t property_crtc_x; uint32_t property_crtc_y; uint32_t property_crtc_w; uint32_t property_crtc_h; uint32_t property_src_x; uint32_t property_src_y; uint32_t property_src_w; uint32_t property_src_h; fd = open("/dev/dri/card0", O_RDWR | O_CLOEXEC); res = drmModeGetResources(fd); crtc_id = res->crtcs[0]; conn_id = res->connectors[0]; drmSetClientCap(fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1); plane_res = drmModeGetPlaneResources(fd); plane_id = plane_res->planes[0]; conn = drmModeGetConnector(fd, conn_id); buf.width = conn->modes[0].hdisplay; buf.height = conn->modes[0].vdisplay; modeset_create_fb(fd, &buf); drmSetClientCap(fd, DRM_CLIENT_CAP_ATOMIC, 1); props = drmModeObjectGetProperties(fd, conn_id, DRM_MODE_OBJECT_CONNECTOR); property_crtc_id = get_property_id(fd, props, "CRTC_ID"); drmModeFreeObjectProperties(props); props = drmModeObjectGetProperties(fd, crtc_id, DRM_MODE_OBJECT_CRTC); property_active = get_property_id(fd, props, "ACTIVE"); property_mode_id = get_property_id(fd, props, "MODE_ID"); drmModeFreeObjectProperties(props); drmModeCreatePropertyBlob(fd, &conn->modes[0], sizeof(conn->modes[0]), &blob_id); req = drmModeAtomicAlloc(); drmModeAtomicAddProperty(req, crtc_id, property_active, 1); drmModeAtomicAddProperty(req, crtc_id, property_mode_id, blob_id); drmModeAtomicAddProperty(req, conn_id, property_crtc_id, crtc_id); drmModeAtomicCommit(fd, req, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL); drmModeAtomicFree(req); printf("drmModeAtomicCommit SetCrtc\n"); getchar(); /* get plane properties */ props = drmModeObjectGetProperties(fd, plane_id, DRM_MODE_OBJECT_PLANE); property_crtc_id = get_property_id(fd, props, "CRTC_ID"); property_fb_id = get_property_id(fd, props, "FB_ID"); property_crtc_x = get_property_id(fd, props, "CRTC_X"); property_crtc_y = get_property_id(fd, props, "CRTC_Y"); property_crtc_w = get_property_id(fd, props, "CRTC_W"); property_crtc_h = get_property_id(fd, props, "CRTC_H"); property_src_x = get_property_id(fd, props, "SRC_X"); property_src_y = get_property_id(fd, props, "SRC_Y"); property_src_w = get_property_id(fd, props, "SRC_W"); property_src_h = get_property_id(fd, props, "SRC_H"); drmModeFreeObjectProperties(props); /* atomic plane update */ req = drmModeAtomicAlloc(); drmModeAtomicAddProperty(req, plane_id, property_crtc_id, crtc_id); drmModeAtomicAddProperty(req, plane_id, property_fb_id, buf.fb_id); drmModeAtomicAddProperty(req, plane_id, property_crtc_x, 50); drmModeAtomicAddProperty(req, plane_id, property_crtc_y, 50); drmModeAtomicAddProperty(req, plane_id, property_crtc_w, 320); drmModeAtomicAddProperty(req, plane_id, property_crtc_h, 320); drmModeAtomicAddProperty(req, plane_id, property_src_x, 0); drmModeAtomicAddProperty(req, plane_id, property_src_y, 0); drmModeAtomicAddProperty(req, plane_id, property_src_w, 320

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DRM应用程序进阶 （atomic

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