Pointer cast distortion

Stay organized with collections Save and categorize content based on your preferences. This module renders the eyes textures into the display. Summary Important: This module functions must be called from the render thread. Functions CardboardDistortionRenderer_destroy(CardboardDistortionRenderer *renderer) void Destroys and releases memory used by the provided distortion renderer object. CardboardDistortionRenderer_renderEyeToDisplay(CardboardDistortionRenderer *renderer, uint64_t target, int x, int y, int width, int height, const CardboardEyeTextureDescription *left_eye, const CardboardEyeTextureDescription *right_eye) void Renders eye textures to a rectangle in the display. CardboardDistortionRenderer_setMesh(CardboardDistortionRenderer *renderer, const CardboardMesh *mesh, CardboardEye eye) void Sets the distortion Mesh for a particular eye. CardboardMetalDistortionRenderer_create(const CardboardMetalDistortionRendererConfig *config) CardboardDistortionRenderer * Creates a new distortion renderer object. CardboardOpenGlEs2DistortionRenderer_create(const CardboardOpenGlEsDistortionRendererConfig *config) CardboardDistortionRenderer * Creates a new distortion renderer object. CardboardOpenGlEs3DistortionRenderer_create(const CardboardOpenGlEsDistortionRendererConfig *config) CardboardDistortionRenderer * Creates a new distortion renderer object. CardboardVulkanDistortionRenderer_create(const CardboardVulkanDistortionRendererConfig *config) CardboardDistortionRenderer * Creates a new distortion renderer object. Functions CardboardDistortionRenderer_destroy void CardboardDistortionRenderer_destroy( CardboardDistortionRenderer *renderer) Destroys and releases memory used by the provided distortion renderer object. Must be called from render thread. renderer Must not be null. When it is unmet, a call to this function results in a no-op. Details Parameters renderer Distortion renderer object pointer. CardboardDistortionRenderer_renderEyeToDisplay void CardboardDistortionRenderer_renderEyeToDisplay( CardboardDistortionRenderer *renderer, uint64_t target, int x, int y, int width, int height, const CardboardEyeTextureDescription *left_eye, const CardboardEyeTextureDescription *right_eye) Renders eye textures to a rectangle in the display. Must be called from render thread. renderer Must not be null. left_eye Must not be null. right_eye Must not be null. renderer.command_buffer Must be started. When it is unmet, a call to this function results in a no-op. OpenGL ES 2.x or 3.x: GLuint. Metal: CardboardMetalDistortionRendererTargetConfig*. Vulkan: CardboardVulkanDistortionRendererTarget*. Parameters x x coordinate of the rectangle's lower left corner in pixels. y y coordinate of the rectangle's lower left corner in pixels. width Size in pixels of the rectangle's width. height Size in pixels of the rectangle's height. left_eye Left eye texture description. right_eye Right eye texture description. Details Parameters renderer Distortion renderer object pointer. target Target configuration. This parameter is some other type transformed via reinterpret_cast to a uint64_t. The original type of this parameter depends on the underlying API used as follows: CardboardDistortionRenderer_setMesh void CardboardDistortionRenderer_setMesh( CardboardDistortionRenderer *renderer, const CardboardMesh *mesh, CardboardEye eye) Sets the distortion Mesh for a particular eye. Must be called from render thread. renderer Must not be null. mesh Must not be null. When it is unmet, a call to this function results in a no-op. Details Parameters renderer Distortion renderer object pointer. mesh Distortion mesh. eye Desired eye. CardboardMetalDistortionRenderer_create CardboardDistortionRenderer * CardboardMetalDistortionRenderer_create( const CardboardMetalDistortionRendererConfig *config) Creates a new distortion renderer object. It uses Metal as the rendering API. Must be called from the render thread. Details Parameters config Distortion renderer configuration. Returns Distortion renderer object pointer CardboardOpenGlEs2DistortionRenderer_create CardboardDistortionRenderer * CardboardOpenGlEs2DistortionRenderer_create( const

Change the lower 4 bytes of number_of_bytes_read on return, whilethe content of the upper 4 bytes stays undefined.Here are a few donts which should help portingapplications from the known ILP32 data model of 32 bit Cygwin, to the LP64data model of 64 bit Cygwin. Note that these are not Cygwin-only problems.Many Linux applications suffered the same somewhat liberal handling ofdatatypes when the AMD64 CPU was new.Don't mix up int and long in printf/scanf. This: int i; long l; printf ("%d %ld\n", l, i);may not print what you think it should. Enable the gcc options -Wformat or-Wall, which warn about type mismatches in printf/scanf functions.NoteUsing -Wall (optionally with -Werror to drive the point home) makes alot of sense in general, not only when porting code to a new platform.Don't mix int and long pointers. long *long_ptr = (long *) &my_int; /* Uh oh! */ *long_ptr = 42;The assignment will write 8 bytes to the address of my_int. Since my_intis only 4 bytes, something else gets randomly overwritten.Finding this kind of bug is very hard, because you will often see a problemwhich has no immediate connection to the actual bug.Don't mix int and pointers at all! This willnot work as expected anymore: void *ptr; printf ("Pointer value is %x\n", ptr);%x denotes an int argument. The value printed by printf is a 4 byte value,so on x86_64 the printed pointer value is missing its upper 4 bytes; the outputis very likely wrong. Use %p instead, which portable across architectures: void *ptr; printf ("Pointer value is %p\n", ptr);Along the same lines don't use the type int inpointer arithmetic. Don't cast pointers to int, don't cast pointerdifferences to int, and don't store pointer differences in an int type.Use the types intptr_t, uintptr_tand ptrdiff_t instead, they are designed for performingarchitecture-independent pointer arithmetic.Don't make blind assumptions about

Read operation to wait until enough packets are collected. To save extra overhead in copying from kernel space to user space, we set this value according to the volume of network traffic.Actual captureNow, we need to start getting packets. Let’s use u_char *pcap_next(pcap_t *p, struct pcap_pkthdr *h). Here, *p is the pointer returned by pcap_open_live(); the other argument is a pointer to a variable of type struct pcap_pkthdr in which the first packet that arrives is returned.The function int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) is used to collect the packets and process them. It will return when cnt number of packets have been captured. A callback function is used to handle captured packets (we need to define this callback function). To pass extra information to this function, we use the *user parameter, which is a pointer to a u_char variable (we will have to cast it ourselves, according to our needs in the callback function).The callback function signature should be of the form: void callback_function(u_char *arg, const struct pcap_pkthdr* pkthdr, const u_char* packet). The first argument is the *user parameter we passed to pcap_loop(); the next argument is a pointer to a structure that contains information about the captured packet. The structure of struct pcap_pkthdr is as follows (from pcap.h):struct pcap_pkthdr { struct timeval ts; /* time stamp */ bpf_u_int32 caplen; /* length of portion present */ bpf_u_int32 len; /* length of this packet (off wire) */};An alternative to pcap_loop() is pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user). The only difference is that it returns when the timeout specified in pcap_open_live() is exceeded.Filtering trafficUntil now, we have been just getting all the packets coming to the interface. Now, we’ll use a pcap function that allows us to filter the traffic coming to a specific port. We