问题描述
我有一些 OpenGL 的示例源代码,我想编译一个 64 位版本(使用 Delphi XE2)但是有一些 ASM 代码无法编译,我对 ASM 一无所知.这是下面的代码,我将两条错误消息放在失败的行上...
I have some sample source code for OpenGL, I wanted to compile a 64bit version (using Delphi XE2) but there's some ASM code which fails to compile, and I know nothing about ASM. Here's the code below, and I put the two error messages on the lines which fail...
// Copy a pixel from source to dest and Swap the RGB color values
procedure CopySwapPixel(const Source, Destination: Pointer);
asm
push ebx //[DCC Error]: E2116 Invalid combination of opcode and operands
mov bl,[eax+0]
mov bh,[eax+1]
mov [edx+2],bl
mov [edx+1],bh
mov bl,[eax+2]
mov bh,[eax+3]
mov [edx+0],bl
mov [edx+3],bh
pop ebx //[DCC Error]: E2116 Invalid combination of opcode and operands
end;
推荐答案
此过程将 ABGR 字节顺序交换为 ARGB,反之亦然.
在 32 位中,此代码应该可以完成所有工作:
This procedure swaps ABGR byte order to ARGB and vice versa.
In 32bit this code should do all the job:
mov ecx, [eax] //ABGR from src
bswap ecx //RGBA
ror ecx, 8 //ARGB
mov [edx], ecx //to dest
X64 的正确代码是
mov ecx, [rcx] //ABGR from src
bswap ecx //RGBA
ror ecx, 8 //ARGB
mov [rdx], ecx //to dest
另一种选择 - 制作纯 Pascal 版本,它更改数组表示中的字节顺序:0123 到 2103(交换第 0 个和第 2 个字节).
Yet another option - make pure Pascal version, which changes order of bytes in array representation: 0123 to 2103 (swap 0th and 2th bytes).
procedure Swp(const Source, Destination: Pointer);
var
s, d: PByteArray;
begin
s := PByteArray(Source);
d := PByteArray(Destination);
d[0] := s[2];
d[1] := s[1];
d[2] := s[0];
d[3] := s[3];
end;
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