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gl.c
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00001 /* 00002 * COPYRIGHT: See COPYING in the top level directory 00003 * PROJECT: ReactOS kernel 00004 * FILE: lib/opengl32/gl.c 00005 * PURPOSE: OpenGL32 lib, glXXX functions 00006 * PROGRAMMER: Anich Gregor (blight) 00007 * UPDATE HISTORY: 00008 * Feb 2, 2004: Created 00009 */ 00010 00011 /* On a x86 we call the ICD functions in a special-way: 00012 * 00013 * For every glXXX function we export a glXXX entry-point which loads the 00014 * matching "real" function pointer from the NtCurrentTeb()->glDispatchTable 00015 * for gl functions in teblist.h and for others it gets the pointer from 00016 * NtCurrentTeb()->glTable and jmps to the address, leaving the stack alone and 00017 * letting the "real" function return for us. 00018 * Royce has implemented this in NASM =D 00019 * 00020 * On other machines we use C to forward the calls (slow...) 00021 */ 00022 00023 #include "opengl32.h" 00024 00025 #if defined(_M_IX86) 00026 C_ASSERT(FIELD_OFFSET(TEB, glTable) == 0xbe8); 00027 #endif 00028 00029 int WINAPI glEmptyFunc0( void ) { return 0; } 00030 int WINAPI glEmptyFunc4( long l1 ) { return 0; } 00031 int WINAPI glEmptyFunc8( long l1, long l2 ) { return 0; } 00032 int WINAPI glEmptyFunc12( long l1, long l2, long l3 ) { return 0; } 00033 int WINAPI glEmptyFunc16( long l1, long l2, long l3, long l4 ) { return 0; } 00034 int WINAPI glEmptyFunc20( long l1, long l2, long l3, long l4, long l5 ) 00035 { return 0; } 00036 int WINAPI glEmptyFunc24( long l1, long l2, long l3, long l4, long l5, 00037 long l6 ) { return 0; } 00038 int WINAPI glEmptyFunc28( long l1, long l2, long l3, long l4, long l5, 00039 long l6, long l7 ) { return 0; } 00040 int WINAPI glEmptyFunc32( long l1, long l2, long l3, long l4, long l5, 00041 long l6, long l7, long l8 ) { return 0; } 00042 int WINAPI glEmptyFunc36( long l1, long l2, long l3, long l4, long l5, 00043 long l6, long l7, long l8, long l9 ) { return 0; } 00044 int WINAPI glEmptyFunc40( long l1, long l2, long l3, long l4, long l5, 00045 long l6, long l7, long l8, long l9, long l10 ) 00046 { return 0; } 00047 int WINAPI glEmptyFunc44( long l1, long l2, long l3, long l4, long l5, 00048 long l6, long l7, long l8, long l9, long l10, 00049 long l11 ) { return 0; } 00050 int WINAPI glEmptyFunc48( long l1, long l2, long l3, long l4, long l5, 00051 long l6, long l7, long l8, long l9, long l10, 00052 long l11, long l12 ) { return 0; } 00053 int WINAPI glEmptyFunc52( long l1, long l2, long l3, long l4, long l5, 00054 long l6, long l7, long l8, long l9, long l10, 00055 long l11, long l12, long l13 ) { return 0; } 00056 int WINAPI glEmptyFunc56( long l1, long l2, long l3, long l4, long l5, 00057 long l6, long l7, long l8, long l9, long l10, 00058 long l11, long l12, long l13, long l14 ) 00059 { return 0; } 00060 00061 #if defined(_M_IX86) 00062 # define FOO(x) #x 00063 00064 #ifdef __GNUC__ 00065 # define X(func, ret, typeargs, args, icdidx, tebidx, stack) \ 00066 __asm__(".align 4" "\n\t" \ 00067 ".globl _"#func"@"#stack "\n\t" \ 00068 "_"#func"@"#stack":" "\n\t" \ 00069 " movl %fs:0x18, %eax" "\n\t" \ 00070 " movl 0xbe8(%eax), %eax" "\n\t" \ 00071 " jmp *"FOO((icdidx*4))"(%eax)" "\n\t"); 00072 #elif defined(_MSC_VER) 00073 # define X(func, ret, typeargs, args, icdidx, tebidx, stack) \ 00074 __declspec(naked) ret WINAPI func typeargs \ 00075 { \ 00076 __asm { mov eax, dword ptr fs:[18h] }; \ 00077 __asm { mov eax, dword ptr [eax+0be8h] }; \ 00078 __asm { jmp dword ptr [eax+icdidx*4] }; \ 00079 } 00080 #else 00081 # define X(func, ret, typeargs, args, icdidx, tebidx, stack) \ 00082 ret WINAPI func typeargs \ 00083 { \ 00084 PROC *table; \ 00085 PROC fn; \ 00086 if (tebidx >= 0 && 0) \ 00087 { \ 00088 table = (PROC *)NtCurrentTeb()->glDispatchTable; \ 00089 fn = table[tebidx]; \ 00090 } \ 00091 else \ 00092 { \ 00093 table = (PROC *)NtCurrentTeb()->glTable; \ 00094 fn = table[icdidx]; \ 00095 } \ 00096 return (ret)((ret(*)typeargs)fn)args; \ 00097 } 00098 #endif 00099 00100 GLFUNCS_MACRO 00101 # undef FOO 00102 # undef X 00103 #else /* defined(_M_IX86) */ 00104 # define X(func, ret, typeargs, args, icdidx, tebidx, stack) \ 00105 ret WINAPI func typeargs \ 00106 { \ 00107 PROC *table; \ 00108 PROC fn; \ 00109 if (tebidx >= 0 && 0) \ 00110 { \ 00111 table = (PROC *)NtCurrentTeb()->glDispatchTable; \ 00112 fn = table[tebidx]; \ 00113 } \ 00114 else \ 00115 { \ 00116 table = (PROC *)NtCurrentTeb()->glTable; \ 00117 fn = table[icdidx]; \ 00118 } \ 00119 return (ret)((ret(*)typeargs)fn)args; \ 00120 } 00121 00122 GLFUNCS_MACRO 00123 00124 # undef X 00125 #endif /* !defined(_M_IX86) */ 00126 00127 /* EOF */
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