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Advanced Topics

Quadro SDI Output PG-03776-001_v06 | 67

Table 10-3. Video Memory Required by an Application

Framebuffer Width: 1920 Height: 1080

Color :

(32-bit RGBA, double buffered)

1920 x 1080 x 4 x 2 / 1024 / 1024 = 15.82 MB

Depth :

(32-bit with packed stencil)

1920 x 1080 x 4 / 1024 / 1024 = 7.91 MB

Overlay :

(16-bit front + back)

1920 x 1080 x 2 x 2 / 1024 / 1024= 7.91 MB

Total:

31.64 MB

Pbuffer Width: 1920 Height: 1080 Samples Per Pixel: 4

Color:

(32-bit RGBA, double buffered)

1920 x 1080 x 4 x 4 x 2 / 1024 / 1024 = 63.28 MB

Depth:

(32-bit with packed stencil)

1920 x 1080 x 4 x 4 / 1024 / 1024 = 31.64 MB

Total:

94.92 MB

SDI Video Width: 1920 Height: 1080 Num Buffers: 5

1920 x 1080 x 8 x 5 / 1024 / 1024 = 79.10 MB

Grand Total:

205.66 MB

10.6 WORKING WITH GREATER THAN 8 BITS PER

COMPONENT

SMPTE specifications support the transmission of greater than 8-bit per-component data

as an SDI video signal. Applications wishing to transmit greater than 8-bit per-

component data may do so by sending FP16 buffer objects or pbuffers to the Quadro

SDI. FP16 is native GPU hardware format with a signed floating point format with a 10-

bit matissa and a 5-bit exponent. After a FP16 render target has been obtained, the

render buffer, texture object or pbuffer must be filled with 16-bit floating point data

prior to transfer. In some cases, this may require that the application image data be

converted from integer to floating point. The data format specified in the video device

configuration determines the expected render target type.

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SDI Technologies iH30 Spezifikationen Seite 72