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Merge pull request #72914 from JonqsGames/GL-half_to_float_zero_exp

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OpenGl : Handle 0 exponent in float/half conversion
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Rémi Verschelde 2023-02-09 09:26:06 +01:00
commit 913a65c044
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GPG Key ID: C3336907360768E1
1 changed files with 14 additions and 4 deletions
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18
drivers/gles3/shaders/stdlib_inc.glsl
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@ -2,13 +2,23 @@
#ifdef USE_GLES_OVER_GL
// Floating point pack/unpack functions are part of the GLSL ES 300 specification used by web and mobile.
uint float2half(uint f) {
return ((f >> uint(16)) & uint(0x8000)) |
((((f & uint(0x7f800000)) - uint(0x38000000)) >> uint(13)) & uint(0x7c00)) |
((f >> uint(13)) & uint(0x03ff));
uint e = f & uint(0x7f800000);
if (e <= uint(0x38000000)) {
return uint(0);
} else {
return ((f >> uint(16)) & uint(0x8000)) |
(((e - uint(0x38000000)) >> uint(13)) & uint(0x7c00)) |
((f >> uint(13)) & uint(0x03ff));
}
}
uint half2float(uint h) {
return ((h & uint(0x8000)) << uint(16)) | (((h & uint(0x7c00)) + uint(0x1c000)) << uint(13)) | ((h & uint(0x03ff)) << uint(13));
uint h_e = h & uint(0x7c00);
if (h_e == uint(0x0000)) {
return uint(0);
} else {
return ((h & uint(0x8000)) << uint(16)) | ((h_e + uint(0x1c000)) << uint(13)) | ((h & uint(0x03ff)) << uint(13));
}
}
uint packHalf2x16(vec2 v) {