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D3D11_VIEWPORT structure (d3d11.h)

  • Article

Defines the dimensions of a viewport.

Syntax

typedef struct D3D11_VIEWPORT {
  FLOAT TopLeftX;
  FLOAT TopLeftY;
  FLOAT Width;
  FLOAT Height;
  FLOAT MinDepth;
  FLOAT MaxDepth;
} D3D11_VIEWPORT;

Members

TopLeftX

Type: FLOAT

X position of the left hand side of the viewport. Ranges between D3D11_VIEWPORT_BOUNDS_MIN and D3D11_VIEWPORT_BOUNDS_MAX.

TopLeftY

Type: FLOAT

Y position of the top of the viewport. Ranges between D3D11_VIEWPORT_BOUNDS_MIN and D3D11_VIEWPORT_BOUNDS_MAX.

Width

Type: FLOAT

Width of the viewport.

Height

Type: FLOAT

Height of the viewport.

MinDepth

Type: FLOAT

Minimum depth of the viewport. Ranges between 0 and 1.

MaxDepth

Type: FLOAT

Maximum depth of the viewport. Ranges between 0 and 1.

Remarks

In all cases, Width and Height must be >= 0 and TopLeftX + Width and TopLeftY + Height must be <= D3D11_VIEWPORT_BOUNDS_MAX.

Viewport Sizes and Feature Level Support Differences between Direct3D 11 and Direct3D 10:

The range for the minimum and maximum viewport size is dependent on the feature level defined by D3D_FEATURE_LEVEL.

  • Direct3D 11 supports fractional viewports; the parameter types are floating-point numbers. The feature level, D3D_FEATURE_LEVEL_11_0, supports (D3D11_VIEWPORT_BOUNDS_MIN, D3D11_VIEWPORT_BOUNDS_MAX) values between (-32768, 32,767).
  • Direct3D 10 does not support fractional viewports. The feature levels, D3D_FEATURE_LEVEL_10_1 (or below), supports (D3D10_VIEWPORT_BOUNDS_MIN, D3D10_VIEWPORT_BOUNDS_MAX) values between (-16384, 16383).
 
Note  Even though you specify float values to the members of the D3D11_VIEWPORT structure for the pViewports array in a call to ID3D11DeviceContext::RSSetViewports for feature levels 9_x, RSSetViewports uses DWORDs internally. Because of this behavior, when you use a negative top left corner for the viewport, the call to RSSetViewports for feature levels 9_x fails. This failure occurs because RSSetViewports for 9_x casts the floating point values into unsigned integers without validation, which results in integer overflow.
 

Requirements

Requirement Value
Header d3d11.h

See also

Core Structures