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The DDKERNELCAPS structure notifies the client what support, if any, exists in the miniport driver for the kernel-mode video transport.
Syntax
typedef struct _DDKERNELCAPS {
DWORD dwSize;
DWORD dwCaps;
DWORD dwIRQCaps;
} *LPDDKERNELCAPS, DDKERNELCAPS;
Members
dwSize
Specifies the size, in bytes, of this structure. This member must be initialized before the structure is used.
dwCaps
Specifies a set of flags indicating the device's capabilities. This member can be any combination of the following capabilities:
| Flag | Meaning |
|---|---|
| DDKERNELCAPS_AUTOFLIP | The driver supports the DxFlipVideoPort and the DxFlipOverlay callbacks, and that these callbacks can be used for autoflipping. |
| DDKERNELCAPS_CAPTURE_INVERTED | The device supports inverting the DIBs while capturing the data. |
| DDKERNELCAPS_CAPTURE_NONLOCALVIDMEM | The device supports a video port extensions (VPE) capture interface capable of transferring data to nonlocal display memory. |
| DDKERNELCAPS_CAPTURE_SYSMEM | The device supports a VPE capture interface capable of transferring data to system memory. |
| DDKERNELCAPS_FIELDPOLARITY | The device can report the polarity (even/odd) of the current VPE object field. |
| DDKERNELCAPS_FLIPOVERLAY | The driver supports the DxFlipOverlay callback. |
| DDKERNELCAPS_FLIPVIDEOPORT | The driver supports the DxFlipVideoPort callback. |
| DDKERNELCAPS_LOCK | The device supports accessing the frame buffer without causing contention with blitters, and so on, and that the driver supports the DxLock callback. |
| DDKERNELCAPS_SETSTATE | The driver supports the DxSetState callback, allowing a client to switch between bob and weave display modes. |
| DDKERNELCAPS_SKIPFIELDS | The device supports field skipping, either using hardware or by supporting the DxSkipNextField callback. |
dwIRQCaps
Can be a combination of the following flags:
| Flag | Meaning |
|---|---|
| DDIRQ_DISPLAY_VSYNC | The device can generate IRQs based on the display VSYNC. |
| DDIRQ_VPORT0_LINE | The device can generate IRQs based on a programmable line for hardware video port number 0. |
| DDIRQ_VPORT0_VSYNC | The device can generate VSYNC IRQs for hardware video port number 0. |
| DDIRQ_VPORT1_LINE | The device can generate IRQs based on a programmable line for hardware video port number 1. |
| DDIRQ_VPORT1_VSYNC | The device can generate V-sync IRQs for hardware video port number 1 |
| DDIRQ_VPORT2_LINE | The device can generate IRQs based on a programmable line for hardware video port number 2. |
| DDIRQ_VPORT2_VSYNC | The device can generate V-sync IRQs for hardware video port number 2. |
| DDIRQ_VPORT3_LINE | The device can generate IRQs based on a programmable line for hardware video port number 3. |
| DDIRQ_VPORT3_VSYNC | The device can generate V-sync IRQs for hardware video port number 3. |
| DDIRQ_VPORT4_LINE | The device can generate IRQs based on a programmable line for hardware video port number 4. |
| DDIRQ_VPORT4_VSYNC | The device can generate V-sync IRQs for hardware video port number 4. |
| DDIRQ_VPORT5_LINE | The device can generate IRQs based on a programmable line for hardware video port number 5. |
| DDIRQ_VPORT5_VSYNC | The device can generate V-sync IRQs for hardware video port number 5. |
| DDIRQ_VPORT6_LINE | The device can generate IRQs based on a programmable line for hardware video port number 6. |
| DDIRQ_VPORT6_VSYNC | The device can generate V-sync IRQs for hardware video port number 6. |
| DDIRQ_VPORT7_LINE | The device can generate IRQs based on a programmable line for hardware video port number 7. |
| DDIRQ_VPORT7_VSYNC | The device can generate V-sync IRQs for hardware video port number 7. |
| DDIRQ_VPORT8_LINE | The device can generate IRQs based on a programmable line for hardware video port number 8. |
| DDIRQ_VPORT8_VSYNC | The device can generate V-sync IRQs for hardware video port number 8. |
| DDIRQ_VPORT9_LINE | he device can generate IRQs based on a programmable line for hardware video port number 9. |
| DDIRQ_VPORT9_VSYNC | he device can generate V-sync IRQs for hardware video port number 9. |
Requirements
| Requirement | Value |
|---|---|
| Header | ddkernel.h (include Ddkernel.h) |