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135 lines
6 KiB
C
135 lines
6 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: lib/opengl32/gl.c
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* PURPOSE: OpenGL32 lib, glXXX functions
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* PROGRAMMER: Anich Gregor (blight)
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* UPDATE HISTORY:
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* Feb 2, 2004: Created
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*/
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/* On a x86 we call the ICD functions in a special-way:
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*
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* For every glXXX function we export a glXXX entry-point which loads the
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* matching "real" function pointer from the NtCurrentTeb()->glDispatchTable
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* for gl functions in teblist.h and for others it gets the pointer from
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* NtCurrentTeb()->glTable and jmps to the address, leaving the stack alone and
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* letting the "real" function return for us.
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* Royce has implemented this in NASM =D
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*
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* On other machines we use C to forward the calls (slow...)
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*/
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#include "opengl32.h"
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#if defined(_M_IX86)
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C_ASSERT(FIELD_OFFSET(TEB, glTable) == 0xbe8);
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#endif
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int WINAPI glEmptyFunc0( void ) { return 0; }
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int WINAPI glEmptyFunc4( long l1 ) { return 0; }
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int WINAPI glEmptyFunc8( long l1, long l2 ) { return 0; }
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int WINAPI glEmptyFunc12( long l1, long l2, long l3 ) { return 0; }
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int WINAPI glEmptyFunc16( long l1, long l2, long l3, long l4 ) { return 0; }
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int WINAPI glEmptyFunc20( long l1, long l2, long l3, long l4, long l5 )
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{ return 0; }
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int WINAPI glEmptyFunc24( long l1, long l2, long l3, long l4, long l5,
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long l6 ) { return 0; }
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int WINAPI glEmptyFunc28( long l1, long l2, long l3, long l4, long l5,
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long l6, long l7 ) { return 0; }
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int WINAPI glEmptyFunc32( long l1, long l2, long l3, long l4, long l5,
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long l6, long l7, long l8 ) { return 0; }
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int WINAPI glEmptyFunc36( long l1, long l2, long l3, long l4, long l5,
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long l6, long l7, long l8, long l9 ) { return 0; }
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int WINAPI glEmptyFunc40( long l1, long l2, long l3, long l4, long l5,
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long l6, long l7, long l8, long l9, long l10 )
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{ return 0; }
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int WINAPI glEmptyFunc44( long l1, long l2, long l3, long l4, long l5,
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long l6, long l7, long l8, long l9, long l10,
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long l11 ) { return 0; }
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int WINAPI glEmptyFunc48( long l1, long l2, long l3, long l4, long l5,
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long l6, long l7, long l8, long l9, long l10,
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long l11, long l12 ) { return 0; }
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int WINAPI glEmptyFunc52( long l1, long l2, long l3, long l4, long l5,
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long l6, long l7, long l8, long l9, long l10,
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long l11, long l12, long l13 ) { return 0; }
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int WINAPI glEmptyFunc56( long l1, long l2, long l3, long l4, long l5,
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long l6, long l7, long l8, long l9, long l10,
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long l11, long l12, long l13, long l14 )
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{ return 0; }
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#if defined(_M_IX86)
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# define FOO(x) #x
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#ifdef __GNUC__
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# define X(func, ret, typeargs, args, icdidx, tebidx, stack) \
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__asm__(".align 4" "\n\t" \
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".globl _"#func"@"#stack "\n\t" \
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"_"#func"@"#stack":" "\n\t" \
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" movl %fs:0x18, %eax" "\n\t" \
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" movl 0xbe8(%eax), %eax" "\n\t" \
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" jmp *"FOO((icdidx*4))"(%eax)" "\n\t");
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#elif defined(_MSC_VER)
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# define X(func, ret, typeargs, args, icdidx, tebidx, stack) \
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__declspec(naked) ret WINAPI func typeargs \
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{ \
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__asm { mov eax, dword ptr fs:[18h] }; \
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__asm { mov eax, dword ptr [eax+0be8h] }; \
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__asm { jmp dword ptr [eax+icdidx*4] }; \
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}
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#else
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# define X(func, ret, typeargs, args, icdidx, tebidx, stack) \
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ret WINAPI func typeargs \
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{ \
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PROC *table; \
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PROC fn; \
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if (tebidx >= 0 && 0) \
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{ \
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table = (PROC *)NtCurrentTeb()->glDispatchTable; \
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fn = table[tebidx]; \
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} \
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else \
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{ \
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table = (PROC *)NtCurrentTeb()->glTable; \
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fn = table[icdidx]; \
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} \
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return (ret)((ret(*)typeargs)fn)args; \
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}
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#endif
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GLFUNCS_MACRO
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# undef FOO
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# undef X
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#else /* defined(_M_IX86) */
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# define X(func, ret, typeargs, args, icdidx, tebidx, stack) \
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ret WINAPI func typeargs \
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{ \
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PROC *table; \
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PROC fn; \
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if (tebidx >= 0 && 0) \
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{ \
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table = (PROC *)NtCurrentTeb()->glDispatchTable; \
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fn = table[tebidx]; \
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} \
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else \
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{ \
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table = (PROC *)NtCurrentTeb()->glTable; \
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fn = table[icdidx]; \
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} \
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return (ret)((ret(*)typeargs)fn)args; \
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}
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GLFUNCS_MACRO
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# undef X
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#endif /* !defined(_M_IX86) */
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/* Unknown debugging function */
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GLint WINAPI glDebugEntry( GLint unknown1, GLint unknown2 )
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{
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return 0;
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}
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/* EOF */
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