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From Bug #36: There are a couple of issues with the selection of Altivec alpha-blitting routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c. 1) There's no check for the presence of Altivec when checking if the Blit32to565PixelAlphaAltivec() routine can be selected. 2) Altivec cannot be used in video memory, and there's no check if the destination surface is a hardware surface. (Alpha-blitting to a hardware surface with GPU support is a bad idea, but somebody's bound to do it anyway.) Patch to fix these attached.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 08 Jan 2006 21:18:15 +0000
parents 355632dca928
children
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>SDL_GLattr</H1
><DIV
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><H2
>Name</H2
>SDL_GLattr&nbsp;--&nbsp;SDL GL Attributes</DIV
><DIV
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><H2
>Attributes</H2
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><TT
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>SDL_GL_RED_SIZE</TT
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><TD
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>Size of the framebuffer red component, in bits</TD
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>SDL_GL_GREEN_SIZE</TT
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>Size of the framebuffer green component, in bits</TD
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>SDL_GL_BLUE_SIZE</TT
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>Size of the framebuffer blue component, in bits</TD
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>SDL_GL_ALPHA_SIZE</TT
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>Size of the framebuffer alpha component, in bits</TD
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><TT
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>SDL_GL_DOUBLEBUFFER</TT
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><TD
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>0 or 1, enable or disable double buffering</TD
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><TT
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>SDL_GL_BUFFER_SIZE</TT
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>Size of the framebuffer, in bits</TD
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>SDL_GL_DEPTH_SIZE</TT
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>SDL_GL_STENCIL_SIZE</TT
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>Size of the stencil buffer, in bits</TD
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>SDL_GL_ACCUM_RED_SIZE</TT
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>Size of the accumulation buffer red component, in bits</TD
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>SDL_GL_ACCUM_GREEN_SIZE</TT
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>Size of the accumulation buffer green component, in bits</TD
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>SDL_GL_ACCUM_BLUE_SIZE</TT
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>Size of the accumulation buffer blue component, in bits</TD
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>SDL_GL_ACCUM_ALPHA_SIZE</TT
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>Size of the accumulation buffer alpha component, in bits</TD
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>While you can set most OpenGL attributes normally, the attributes list above must be known <SPAN
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>SDL_GL_SetAttribute</TT
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