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rsx/common/d3d12/gl: Mimic divsq and rsq fragment instruction behaviour with 0.

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Fix Super Puzzle Turbo HD 2 and SH3 HD
This commit is contained in:
Vincent Lejeune 2016-01-03 18:40:19 +01:00
parent 31a925b4f0
commit 675ccd4510
3 changed files with 46 additions and 4 deletions
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17
rpcs3/Emu/RSX/GL/GLFragmentProgram.cpp
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@ -84,6 +84,23 @@ void GLFragmentDecompilerThread::insertConstants(std::stringstream & OS)
void GLFragmentDecompilerThread::insertMainStart(std::stringstream & OS)
{
// "lib" function
// 0.00001 is used as "some non zero very little number"
OS << "vec4 divsq_legacy(vec4 num, vec4 denum)\n";
OS << "{\n";
OS << " return num / sqrt(max(denum.xxxx, 0.00001));\n";
OS << "}\n";
OS << "vec4 rcp_legacy(vec4 denum)\n";
OS << "{\n";
OS << " return 1. / denum;\n";
OS << "}\n";
OS << "vec4 rsq_legacy(vec4 denum)\n";
OS << "{\n";
OS << " return 1. / sqrt(max(denum, 0.00001));\n";
OS << "}\n";
OS << "void main ()" << std::endl;
OS << "{" << std::endl;