摘要:
An array-word-organized memory system comprising a plurality of columns and rows of memory chips, an address bus routed through all of the memory chips, a plurality of selectable CAS lines wherein one of the CAS lines is routed through each one of said plurality of columns of memory chips and a plurality of selectable RAS lines wherein one of the RAS lines is routed through each one of said plurality of rows of memory chips. In operation, selected X and Y addresses are applied to the memory chips together with the strobing of selected ones of the CAS and RAS lines during four sequential time periods for addressing arbitrary arrays of pixels stored in the memory chips.
摘要:
A graphics processor having a bit map comprising a plurality of memory planes is provided with an 8.times.8 barrel shifter which is responsive to a plurality of control signals for selectively shifting bits within the planes and/or between planes.
摘要:
An image processor is provided which rasterizes polygons with a minimum of computation. Pixels are tested for being inside a triangle by sorting the vertices by their values in one coordinate, rounding the vertices to the nearest pixels, and calculating two characteristic functions for pixels one scan line at a time, thereby identifying two end pixels for the scan line, where the particular functions used are edge characteristic functions for the two edges which bound pixels in the scan line within the triangle defined by the rounded vertices. To avoid ambiguity, pixels on one end of a scan line are deemed outside the triangle if they are exactly on the edge. Alternatively, only one function per pixel is used, the edge function for the nearest edge. The rasterization process is extensible to polygons of more than three sides, by taking into account that only two sides of the polygon need to be considered for a given scan line, and thus only two characteristic functions are needed at any one time. Using just the fractional part of an edge's intersection with a scan line to detect whether a pixel is inside or outside is also possible. Where a characteristic function is used, the value of the function can be used as an anti-aliasing value, which would be a measure of how much of the pixel lies inside the triangle.
摘要:
A method for rendering a three dimensional graphic object in a two dimensional display space by segmenting the object into parallelepipeds and decomposing the parallelepipeds into rods of voxels that are parallel to the depth axis (Z) of the display and by projecting the rods of voxels onto the X-Y plane of the display as lines of pixels and a method for drawing antialiased volumetric images. An apparatus for implementing both methods includes an interpolator, having a set-up unit and an iterator unit, and a blender. The set-up unit determines various parameters of the image to be drawn, including the total number of voxels to be blended together into each pixel to be drawn, and selects a pixel pair adjacent to and straddling an idealized line representing a line to be drawn. The iterator unit determines the coverages of the pixel pair based on parameters output by the set-up unit. The blender determines the color intensity values of the pixel pair as a function of the coverages, and the opacity of voxels in the voxel rod corresponding to each pixel, and writes the color values into a memory that drives the display. The memory is split into at least four banks so that color values of the pair of pixel can be simultaneously stored in different memory banks. A method for resolving accumulation error in the derivation of each pixel's position and a method for accommodating for the effect of additional intersected pixels may be used in connection with the above-described methods.
摘要:
A graphics controller having the capacity for translating X and Y logical addresses of words in a bit map into corresponding physical row and column addresses of words in a plurality of memory chips, for addressing selected bits within a word and for refreshing a video monitor with and without window segments beginning and ending with bits located inside word boundaries.
摘要:
A circuit and method for a display controller especially adapted for display memories organized in arrays. The invention permits high speed modification of the contents of a display by generating the address signals of a selected linear pattern as the data block to be modified is retrieved from the display memory. For vectors, the addresses are generated in the same time as required for data block retrieval. The invention also permits calculation of the addresses of simple curves as the data block to be modified is retrieved, though calculation times typically are longer than for vectors. Modified Breshenham's algorithm is used for the address calculation.
摘要:
A highly available multi-node computer system is operated by monitoring the aging and usage of a plurality of hardware components that are part of the system's networked nodes. While monitoring the components, a determination is made that one of the components has aged, worn, or both, to a level that is selected as being close enough to the component's predicted end of life in the system so as to prevent failure of the component in the system. A notification is sent to replace the component, in response to the determination. Other embodiments are also described and claimed.
摘要:
A data storage system has a number of server groups, where each group has data storage servers. A file is stored in the system by being spread across two or more of the servers. The servers are communicatively coupled to internal packet switches. An external packet switch is communicatively coupled to the internal packet switches. Client access to each of the servers is through one of the internal packet switches and the external packet switch. Other embodiments are also described and claimed.
摘要:
A method and system is provided for rendering bicubic surfaces of an object on a computer system. Each bicubic surface is defined by sixteen control points and bounded by four boundary curves, each corresponding to an edge, and each boundary curve is formed by boundary box of line segments formed between four of the control points. The method and system of include transforming only the control points of the surface given a view of the object, rather than points across the entire bicubic surface, and using the four boundary edges for purposes of subdivision. Next, a pair of orthogonal boundary curves to process is selected. After the boundary curves have been selected, each of the curves is iteratively subdivided and the pair of orthogonal internal curves, wherein two new curves are generated with each subdivision. The subdivision of each of the curves is terminated when the curves satisfy a flatness threshold expressed in screen coordinates, whereby the number of computations required to render the object is minimized.
摘要:
Aspects for rendering bicubic surfaces of an object on a computer system are disclosed. Each bicubic surface is defined by sixteen control points and bounded by four boundary curves, and each boundary curve is formed by boundary box of line segments formed between four of the control points. The method and system of include transforming only the control points of the surface given a view of the object, rather than points across the entire bicubic surface. Next, a pair of orthogonal boundary curves to process is selected. After the boundary curves have been selected, each of the curves is iteratively subdivided, wherein two new curves are generated with each subdivision. The subdivision of each of the curves is terminated when the curves satisfy a flatness threshold expressed in screen coordinates, whereby the number of computations required to render the object is minimized.