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Memory Copy, Being Safe

Started by Gary Oct 11, 2000 at 3:03 AM 0 replies 250+ views

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Oct 11, 2000 at 3:03 AM

Lets assume that I''m running a program in 16-bit. Now lets say I create a texture by: PR_SetTextureFormat ( TEXTURE_RGB_565 ); PR_SetTextureStage ( 0 ); image = wallocblock (VTEXSIZE, VTEXSIZE); VTexture = PR_AddTexture ("vtex", image); I have a question. Some cards use 555 and some use 565, can I just assume that the backbuffer and texure are both converted to the same 16-bit format. Or is it possible to get a 555 backbuffer and a 565 texture or maybe a 565 backbuffer and a 555 texture in which case I''d have to convert between 16-bit formats. Gary

ChrisE

Oct 11, 2000 at 8:20 AM

wallocblock will allocate an 8 bit image regardless of the video mode you''re in. wnewblock on the other hand will grab a section of the backbuffer in the same format as the backbuffer. wnewblock can''t be used with PR_AddTexture(32) since it expects 8 or 32 bit images.

Internally PR converts everything to 32 bit, then converts to the format needed by the hardware. It''s easy if you work in 32 bit color and let PR downgrade the quality to whatever it needs.

You cannot guarantee the backbuffer surface format will match the texture formats.

Chris

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