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Patch from Antonio SJ Musumeci: " This code with SDL-1.2.8 and CVS: #include <stdio.h> #include <stdlib.h> #include <SDL.h> int main(int argc, char** argv) { char alphabet[26] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; char buffer_file[27] = {0}; char buffer_mem[27] = {0}; int rv_file; int rv_mem; FILE* file_ptr; SDL_RWops* rwop_file; SDL_RWops* rwop_mem; file_ptr = fopen("./blah", "w"); fwrite(alphabet, 1, sizeof(alphabet), file_ptr); fclose(file_ptr); rwop_mem = SDL_RWFromMem(alphabet, sizeof(alphabet)); rwop_file = SDL_RWFromFile("./blah", "r"); rv_mem = SDL_RWread(rwop_mem , buffer_mem, 5, 6); rv_file = SDL_RWread(rwop_file, buffer_file, 5, 6); printf("From File: %d %s\n" "From Mem: %d %s\n", rv_file, buffer_file, rv_mem, buffer_mem); printf("Seek end of File: %d\n" "Seek end of Mem: %d\n", SDL_RWseek(rwop_file, 0, SEEK_END), SDL_RWseek(rwop_mem , 0, SEEK_END)); SDL_RWclose(rwop_file); SDL_RWclose(rwop_mem); return 0; } Produces this output: From File: 5 ABCDEFGHIJKLMNOPQRSTUVWXYZ From Mem: 5 ABCDEFGHIJKLMNOPQRSTUVWXY Seek end of File: 26 Seek end of Mem: 26 " --ryan.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 24 Jun 2005 12:48:38 +0000
parents 355632dca928
children
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<HTML
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>SDL_GLattr</TITLE
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><H1
><A
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>SDL_GLattr</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN2971"
></A
><H2
>Name</H2
>SDL_GLattr&nbsp;--&nbsp;SDL GL Attributes</DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN2974"
></A
><H2
>Attributes</H2
><DIV
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><P
></P
><TABLE
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CLASS="CALSTABLE"
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><TR
><TD
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><TT
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>SDL_GL_RED_SIZE</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Size of the framebuffer red component, in bits</TD
></TR
><TR
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ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_GL_GREEN_SIZE</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Size of the framebuffer green component, in bits</TD
></TR
><TR
><TD
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><TT
CLASS="LITERAL"
>SDL_GL_BLUE_SIZE</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Size of the framebuffer blue component, in bits</TD
></TR
><TR
><TD
ALIGN="LEFT"
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><TT
CLASS="LITERAL"
>SDL_GL_ALPHA_SIZE</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Size of the framebuffer alpha component, in bits</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_GL_DOUBLEBUFFER</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>0 or 1, enable or disable double buffering</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_GL_BUFFER_SIZE</TT
></TD
><TD
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VALIGN="TOP"
>Size of the framebuffer, in bits</TD
></TR
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><TT
CLASS="LITERAL"
>SDL_GL_DEPTH_SIZE</TT
></TD
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>Size of the depth buffer, in bits</TD
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><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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><TT
CLASS="LITERAL"
>SDL_GL_ACCUM_RED_SIZE</TT
></TD
><TD
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VALIGN="TOP"
>Size of the accumulation buffer red component, in bits</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_GL_ACCUM_GREEN_SIZE</TT
></TD
><TD
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VALIGN="TOP"
>Size of the accumulation buffer green component, in bits</TD
></TR
><TR
><TD
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VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_GL_ACCUM_BLUE_SIZE</TT
></TD
><TD
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VALIGN="TOP"
>Size of the accumulation buffer blue component, in bits</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_GL_ACCUM_ALPHA_SIZE</TT
></TD
><TD
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>Size of the accumulation buffer alpha component, in bits</TD
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><H2
>Description</H2
><P
>While you can set most OpenGL attributes normally, the attributes list above must be known <SPAN
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>before</I
></SPAN
> SDL sets the video mode. These attributes a set and read with <A
HREF="sdlglsetattribute.html"
><TT
CLASS="FUNCTION"
>SDL_GL_SetAttribute</TT
></A
> and <A
HREF="sdlglgetattribute.html"
><TT
CLASS="FUNCTION"
>SDL_GL_GetAttribute</TT
></A
>.</P
></DIV
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><A
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></A
><H2
>See Also</H2
><P
><A
HREF="sdlglsetattribute.html"
><TT
CLASS="FUNCTION"
>SDL_GL_SetAttribute</TT
></A
>,
<A
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