Samsung S5PC100, User Manual, Page: 1280 / 1863

S5PC100 USER’S MANUAL (REV1.0) 3D-ACCELERATOR
9.6-53
6.1.2 Rasterizer Overview
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Triangle, Line, Point, and Point Sprite are supported. (Aliased only)
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2-fragments are generated concurrently by a 2x1 stamp.
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Fragment position value calculation. (Screen coordinates[x, y], depth [z, iw])
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Fragment value calculation. (Color / fog / normal / texture coordinates)
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Coefficients calculation for LOD selection.
Figure 9.6- 16 Rasterizer Pipeline Overview
6.2 INITIAL OPERATION
The details of raster engine operation:
Sampling position control register: This register indicates whether pixel is sampled at the center or corner of the
pixel. So, it is enough to set this value one time initially.
Depth offset control register: It is necessary to set this register and the values of factor and units for an object that
uses depth offset. This register value can be changed only in context switching time.
Back face culling control register: To process back face cull, cull face register, front face register and enable
register all should be set. This register value can be changed only in context switching time.
LOD control register: It is necessary to set this register if pixel shader uses DDX/DDY/LOD. This register value
should be set to 0b when pixel shader doesn’t use DDX/DDY/LOD. This register value can be changed only in
context switching time.
Window X/Y-Clipping region control register: To clip window region given by viewing frustum.
Coord Replace control register: It is used for only Point Sprite rendering. For PointSprite, texture coordinate
coefficients generated in TSE are attached behind of the last attribute. Therefore, the Coord Replace control bit
should be set correctly in the attribute number corresponding to the attached texture coordinate coefficients.