tg-shadow3

Description

This program shows an example of complicated full-scene shadow generation. This demo uses depth buffer-based method, which can also produce self-shadowing effect. (For details, see the Algorithm Details section.))

Coverage

This list doesn't contain settings for drawing other than full-scene shadows.

Functions	Parameters	Description
`GXLoadTexMtxImm`	Matrices	Appropriate projection matrix.
	Matrix destination.	`GX_TEXMTX0`, `GX_TEXMTX1`
	Types	`GX_MTX3x4`
`GXSetNumTexGens`	number of texgens	2
`GXSetTexCoordGen`	Destination coordinates.	`GX_TEXCOORD0`, `GX_TEXCOORD1`
	Generation type.	`GX_TG_MTX3x4`
	Generation source.	`GX_TG_POS`
	Matrix source.	`GX_TEXMTX0`, `GX_TEXMTX1`
`GXInitTexObj`	Pointer to image data.	Appropriate value.
	Width and height	Some constant values
	Format	`GX_TF_RGBA8`
	Wrap mode (s, t).	`GX_CLAMP`
	Mipmap	Always `GX_FALSE`.
`GXLoadTexObj`	Destination texture name.	`GX_TEXMAP0`, `GX_TEXMAP1`
`GXInvalidateTexAll`	(No parameter)
`GXSetTexCopySrc`	top / left / width / height	Some constant values
`GXSetTexCopyDst`	Width and height	Some constant values
	Format	`GX_TF_Z24X8`
	Mipmap filter	`GX_FALSE.`
`GXCopyTex`	Pointer to image data.	Appropriate value.
`GXCopyTex`	Clear operation	`GX_TRUE.`
`GXSetNumTevStages`	Number of TEV Stages	3 (for 8-bit compare mode), 5 (for 16-bit compare mode)
`GXSetTevOrder`	Each argument	see algorithm details
`GXSetTevColorIn`	Each argument	see algorithm details
`GXSetTevColorOp`	Each argument	see algorithm details
`GXSetTevAlphaIn`	Each argument	see algorithm details
`GXSetTevAlphaOp`	Each argument	see algorithm details
`GXSetTevColor`	TEV Color Register	`GX_TEVREG0`, `GX_TEVREG2`
`GXSetTevColor`	Color value	Appropriate value.
`GXSetCullMode`	culling mode	`GX_CULL_FRONT`, `GX_CULL_BACK`
`GXSetColorUpdate`	color update mode	`GX_ENABLE` / `GX_DISABLE`
`GXPixModeSync`	(No parameter)

Using the Demo

End the test with START.

The main stick moves camera position.
The sub stick moves light position.

The A Button changes display modes.
The B Button switches the shadow projection type (perspective/orthographic).
The Y Button changes the size of shadow map.

Snapshot

tg-shadow3-00.jpg (56135 bytes)

Required Data Files

None.

Algorithm Details

See Section "7.1 Depth-Based Full-Scene Shadow Mapping" in "Graphics Library [Application Edition]."

Revision History

2006/03/01 Initial version.

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