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nv2a: Fix EXP and LOG

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According to the NV_vertex_program specification, our implementations of
these functions were wrong.
spec:
https://www.khronos.org/registry/OpenGL/extensions/NV/NV_vertex_program.txt
This commit is contained in:
Lucas Eriksson 2018-08-18 02:20:48 +02:00 committed by Jannik Vogel
parent 667fe8536d
commit c01c27d968
1 changed files with 14 additions and 2 deletions
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16
hw/xbox/nv2a/nv2a_vsh.c
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@ -674,13 +674,25 @@ static const char* vsh_header =
"#define EXP(dest, mask, src) dest.mask = _EXP(_in(src).x).mask\n"
"vec4 _EXP(float src)\n"
"{\n"
" return vec4(exp2(src));\n"
" vec4 result;\n"
" result.x = exp2(floor(src));\n"
" result.y = src - floor(src);\n"
" result.z = exp2(src);\n"
" result.w = 1.0;\n"
" return result;\n"
"}\n"
"\n"
"#define LOG(dest, mask, src) dest.mask = _LOG(_in(src).x).mask\n"
"vec4 _LOG(float src)\n"
"{\n"
" return vec4(log2(src));\n"
" float tmp = abs(src);\n"
" if (tmp == 0.0) { return vec4(-INFINITY, 1.0f, -INFINITY, 1.0f); }\n"
" vec4 result;\n"
" result.x = floor(log2(tmp));\n"
" result.y = tmp / exp2(floor(log2(tmp)));\n"
" result.z = log2(tmp);\n"
" result.w = 1.0;\n"
" return result;\n"
"}\n"
"\n"
"#define LIT(dest, mask, src) dest.mask = _LIT(_in(src)).mask\n"