janwas
a3696c0b91
lib/sysdep: clean up by moving OS and cpu-arch folders into "os" and "arch" folders This was SVN commit r6162.
51 lines
1.0 KiB
NASM
51 lines
1.0 KiB
NASM
%include "../lib/sysdep/arch/ia32/ia32.inc"
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;-------------------------------------------------------------------------------
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; Color conversion (SSE)
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;-------------------------------------------------------------------------------
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; extern "C" u32 ConvertRGBColorTo4ub(const RGBColor& color)
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[section .data]
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align 16
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zero:
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dd 0.0
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twofivefive:
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dd 255.0
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__SECT__
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align 16
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global sym(sse_ConvertRGBColorTo4ub)
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sym(sse_ConvertRGBColorTo4ub):
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mov eax, [esp+4]
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; xmm0, 1, 2 = R, G, B
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movss xmm4, [zero]
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movss xmm0, [eax+8]
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movss xmm1, [eax+4]
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movss xmm2, [eax]
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movss xmm5, [twofivefive]
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; C = min(255, 255*max(C, 0)) ( == clamp(255*C, 0, 255) )
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maxss xmm0, xmm4
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maxss xmm1, xmm4
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maxss xmm2, xmm4
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mulss xmm0, xmm5
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mulss xmm1, xmm5
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mulss xmm2, xmm5
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minss xmm0, xmm5
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minss xmm1, xmm5
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minss xmm2, xmm5
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; convert to integer and combine channels using bit logic
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cvtss2si eax, xmm0
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cvtss2si ecx, xmm1
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cvtss2si edx, xmm2
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shl eax, 16
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shl ecx, 8
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or eax, 0xff000000
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or edx, ecx
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or eax, edx
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ret
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