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rsx/fp: Fix biased renormalization without BX2 flag

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- With biased renorm, a value of 0 gives a value slightly less than -1
- Biased renormalization does not have a "clamped" mode unlike sext
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kd-11 2026-02-12 01:23:13 +03:00 committed by kd-11
parent 3f321c61f3
commit 2f5a66581f
1 changed files with 10 additions and 2 deletions
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12
rpcs3/Emu/RSX/Program/GLSLSnippets/RSXProg/RSXFragmentTextureOps.glsl
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@ -29,17 +29,20 @@ R"(
// NOTE: BX2 expansion overrides GAMMA correction
uint _texture_flag_override = 0;
uint _texture_flag_erase = 0;
bool _texture_bx2_active = false;
#define _enable_texture_expand(index) \
do { \
if (_test_bit(TEX_PARAM(index).flags, FORMAT_FEATURE_BIASED_RENORMALIZATION_BIT)) { \
_texture_flag_override = SIGN_EXPAND_MASK; \
_texture_flag_erase = GAMMA_CTRL_MASK; \
_texture_bx2_active = true; \
} \
} while (false)
#define _disable_texture_expand() \
do { \
_texture_flag_override = 0; \
_texture_flag_erase = 0; \
_texture_bx2_active = false; \
} while (false)
#define TEX_FLAGS(index) ((TEX_PARAM(index).flags & ~(FORMAT_FEATURE_MASK | _texture_flag_erase)) | _texture_flag_override)
#else
@ -200,7 +203,7 @@ vec4 _sext_unorm8x4(const in vec4 x)
vec4 _process_texel(in vec4 rgba, const in uint control_bits)
{
if (control_bits == 0)
if ((control_bits & ~FORMAT_FEATURE_MASK) == 0u)
{
return rgba;
}
@ -254,7 +257,12 @@ vec4 _process_texel(in vec4 rgba, const in uint control_bits)
{
// Expand to signed normalized by decompressing the signal
mask = uvec4(op_mask) & uvec4(EXPAND_R_MASK, EXPAND_G_MASK, EXPAND_B_MASK, EXPAND_A_MASK);
convert = (rgba * 2.f - 1.f);
#ifdef _ENABLE_TEXTURE_EXPAND
if (_texture_bx2_active)
convert = (rgba * 2.f - 1.f);
else
#endif
convert = (floor(fma(rgba, vec4(255.f), vec4(0.5f))) - 128.f) / 127.f;
rgba = _select(rgba, convert, notEqual(mask, uvec4(0)));
}