US 2003/0201994 A1Published application

Pixel engine

AssigneeIntel Corporation

InventorsRalph Clayton Taylor, Michael Mantor, Vineet Goel, Val Gene Cook, Stuart Krupnik

Life of this patent

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Abstract

There is provided a method for compressing texture values comprising: assigning texture values in a YUV format; packing the texture values into 32-bit words; and color promoting the texture values to 8-bit values. The YUV format has a Y component for every pixel sample, and U/V (they are also named Cr and Cb) components for every fourth sample. Every U/V sample coincides with four (2×2) Y samples. A single 32-bit word contains four packed Y values, one value each for U and V, and optionally four one-bit Alpha components as follows: YUV_0566-5-bits each of four Y values, 6-bits each for U and V; and YUV_1544-5-bits each of four Y values, 4-bits each for U and V, four 1-bit Alphas. The color promotion converts these components from 4-, 5-, or 6-bit values to 8-bit values. This method yields compression from 96 bits down to 32 bits, or 3:1 compression.

Claims5

Dependent claims

A method for determining the rate of change of texture address variables U and V as a function of address variables x and y of a pixel, wherein,

U is the texture coordinate of the pixel in the S direction
V is the texture coordinate of the pixel in the T direction
W is the homogenous w value of the pixel (typically the depth value)
Inv_W is the inverse of W
C0n is the value of attribute n at some reference point. (x′=0
, y′=0)
CXn is the change of attribute n for one pixel in the raster x direction
CYn is the change of attribute n for one pixel in the raster y direction
n includes S=U/W and T=V/W
x is the screen coordinate of the pixel in the x raster direction
y is the screen coordinate of the pixel in the y raster direction
the method comprising the steps of:
calculate the start value and rate of change in raster x,y direction for the attribute T resulting in C0s, CXs, Cys;
calculate the start value and rate of change in the raster x,y direction for the attribute T, resulting in C0t, CXt, Cyt;
calculate the start value and rate of change in the raster x,y direction for the attribute 1/W, resulting in C0inv_W, CXinv_W, CYinv_W;
calculate the perspective correct values of U and V resulting in
23 U = C0s + CXs * X + CYs * Y C0inv_w + CXinv_w * X + CYinv_w * Y V = C0t + CXt * X + CYt * Y C0inv_w + CXinv_w * X + CYinv_w * Y
Calculate the rate of change of texture address variables U and V as a function of address variables x and y, resulting in
24 ⅆ u ⅆ x = W * [ CXs - U * CXinv_w ] ⅆ u ⅆ y = W * [ CYs - U * CYinv_w ] ⅆ v ⅆ y = W * [ CYt - V * CYinv_w ]

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/304,292Filed 26 Nov 2002
Priority: 16 Jul 1999
Published: 30 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G09G 5/02
Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators: characterised by the way…
G09G 5/393
Control of the bit-mapped memory: arrangements for updating the contents of the bit-mapped memory
G09G 5/395
Control of the bit-mapped memory: arrangements specially adapted for transferring the contents of the bit-mapped memory to the screen
G06F 3/1431
Controlling a plurality of local displays, e.g. CRT and flat panel display: using a single graphics controller

Family

Application60/144,288Us provisional application · filed 16 Jul 1999
Application09/618,082Continuation · filed 17 Jul 2000
Application09/799,943Continuation · filed 5 Mar 2001
Application09/978,973Division · filed 16 Oct 2001
Application09/978,973Continuation · filed 16 Oct 2001
Application10/304,292Division · filed 26 Nov 2002
US 2002/0167523 A1Published application
US 6,518,974 B2Related patent
US 2003/0201994 A1This patent

From the US filing history. Foreign family members aren’t listed.