Mercurial > sdl-ios-xcode
annotate src/hermes/x86_main.asm @ 1240:3b8a43c428bb
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 | 3202d727bb4b |
| children | 393092a3ebf6 |
| rev | line source |
|---|---|
| 0 | 1 ; |
| 2 ; x86 format converters for HERMES | |
| 3 ; Some routines Copyright (c) 1998 Christian Nentwich (brn@eleet.mcb.at) | |
| 4 ; This source code is licensed under the GNU LGPL | |
| 5 ; | |
| 6 ; Please refer to the file COPYING.LIB contained in the distribution for | |
| 7 ; licensing conditions | |
| 8 ; | |
| 9 ; Most routines are (c) Glenn Fiedler (ptc@gaffer.org), used with permission | |
| 10 ; | |
| 11 | |
| 12 BITS 32 | |
| 13 | |
| 14 GLOBAL _ConvertX86 | |
| 15 GLOBAL _x86return | |
| 16 | |
| 17 GLOBAL _Hermes_X86_CPU | |
| 18 | |
| 19 SECTION .text | |
| 20 | |
| 21 ;; _ConvertX86: | |
| 22 ;; [ESP+8] ConverterInfo* | |
| 23 ;; -------------------------------------------------------------------------- | |
| 24 ;; ConverterInfo (ebp+..) | |
| 25 ;; 0: void *s_pixels | |
| 26 ;; 4: int s_width | |
| 27 ;; 8: int s_height | |
| 28 ;; 12: int s_add | |
| 29 ;; 16: void *d_pixels | |
| 30 ;; 20: int d_width | |
| 31 ;; 24: int d_height | |
| 32 ;; 28: int d_add | |
| 33 ;; 32: void (*converter_function)() | |
| 34 ;; 36: int32 *lookup | |
| 35 | |
| 36 _ConvertX86: | |
| 37 push ebp | |
| 38 mov ebp,esp | |
| 39 | |
| 40 ; Save the registers used by the blitters, necessary for optimized code | |
| 41 pusha | |
| 42 | |
| 43 mov eax,[ebp+8] | |
| 44 | |
| 45 cmp dword [eax+4],BYTE 0 | |
| 46 je endconvert | |
| 47 | |
| 48 mov ebp,eax | |
| 49 | |
| 50 mov esi,[ebp+0] | |
| 51 mov edi,[ebp+16] | |
| 52 | |
| 53 y_loop: | |
| 54 mov ecx,[ebp+4] | |
| 55 | |
| 56 jmp [ebp+32] | |
| 57 | |
| 58 _x86return: | |
| 59 add esi,[ebp+12] | |
| 60 add edi,[ebp+28] | |
| 61 | |
| 62 dec dword [ebp+8] | |
| 63 jnz y_loop | |
| 64 | |
| 65 ; Restore the registers used by the blitters, necessary for optimized code | |
| 66 popa | |
| 67 | |
| 68 pop ebp | |
| 69 | |
| 70 endconvert: | |
| 71 ret | |
| 72 | |
| 73 | |
| 74 | |
| 75 ;; Hermes_X86_CPU returns the CPUID flags in eax | |
| 76 | |
| 77 _Hermes_X86_CPU: | |
| 78 pushfd | |
| 79 pop eax | |
| 80 | |
| 81 mov ecx,eax | |
| 82 | |
| 83 xor eax,040000h | |
| 84 push eax | |
| 85 | |
| 86 popfd | |
| 87 pushfd | |
| 88 | |
| 89 pop eax | |
| 90 xor eax,ecx | |
| 91 jz .L1 ; Processor is 386 | |
| 92 | |
| 93 push ecx | |
| 94 popfd | |
| 95 | |
| 96 mov eax,ecx | |
| 97 xor eax,200000h | |
| 98 | |
| 99 push eax | |
| 100 popfd | |
| 101 pushfd | |
| 102 | |
| 103 pop eax | |
| 104 xor eax,ecx | |
| 105 je .L1 | |
| 106 | |
|
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From Mike Frysinger and/or Gentoo:
Ryan C. Gordon <icculus@icculus.org>
parents:
1199
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107 push ebx |
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From Mike Frysinger and/or Gentoo:
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parents:
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108 |
| 0 | 109 mov eax,1 |
| 110 cpuid | |
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parents:
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111 mov eax,edx |
| 0 | 112 |
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parents:
1199
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113 pop ebx |
| 0 | 114 |
| 115 .L1: | |
| 116 ret | |
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From: Mike Frysinger <vapier@gentoo.org>
Ryan C. Gordon <icculus@icculus.org>
parents:
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117 |
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From: Mike Frysinger <vapier@gentoo.org>
Ryan C. Gordon <icculus@icculus.org>
parents:
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118 %ifidn __OUTPUT_FORMAT__,elf |
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2d6dc7de1145
From: Mike Frysinger <vapier@gentoo.org>
Ryan C. Gordon <icculus@icculus.org>
parents:
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119 section .note.GNU-stack noalloc noexec nowrite progbits |
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From: Mike Frysinger <vapier@gentoo.org>
Ryan C. Gordon <icculus@icculus.org>
parents:
1166
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120 %endif |