Intel 815 manual Gfxrenderstatelinewidthcullshade Mode

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Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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13.18.GFXRENDERSTATE_LINE_WIDTH_CULL_SHADE_ MODE

The provoking vertex refers to the vertex that selected the flat shaded color for the primitive. In the OpenGL* specification, the third/second (triangle/line) vertex should used. In D3D* specification, the first vertex should be used. There is an additional mode to allow the selection of the common vertex for triangle fan primitive and the third/second (triangle/line) vertex for other primitives.

Please note that this instruction packet affects the following selections:

D3D* and OGL strip and fan notations selection

D3D* and OGL vertex selection on flat shading color

In flat shade mode the value of the first vertex in the primitive is used to determine the value of the face. In Gouraud shade mode the value of the face is determined by a linear interpolation between all of the primitive’s vertices.

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Image 239
Intel 815 manual Gfxrenderstatelinewidthcullshade Mode