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rsx: Remove zclip hackery

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- Calculates precise Z value as requested by the game
- Works properly if the underlying Z format matches the PS3 1:1 but may cause minor problems otherwise
This commit is contained in:
kd-11 2021-12-20 00:48:47 +03:00 committed by kd-11
parent dcd011048d
commit 1ce5349199
1 changed files with 8 additions and 16 deletions
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24
rpcs3/Emu/RSX/Program/GLSLCommon.cpp
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@ -603,27 +603,19 @@ namespace glsl
{
if (props.emulate_depth_clip_only)
{
// Declare rcp_precise. Requires f64 support in the drivers.
// This is required to handle precision drift during division for extended depth range.
OS <<
"double rcp_precise(double x)\n"
"{\n"
" double scaled = x * 0.0009765625;\n"
" double inv = 1.0 / scaled;\n"
" return inv * 0.0009765625;\n"
"}\n"
"\n"
// Technically the depth value here is the 'final' depth that should be stored in the Z buffer.
// Forward mapping eqn is d' = d * (f - n) + n, where d' is the stored Z value (this) and d is the normalized API value.
OS <<
"vec4 apply_zclip_xform(const in vec4 pos, const in float near_plane, const in float far_plane)\n"
"{\n"
" if (far_plane != 0.0 && pos.w != 0.0)\n"
" if (pos.w != 0.0)\n"
" {\n"
" double z_range = (far_plane > near_plane)? (far_plane - near_plane) : far_plane;\n"
" double inv_range = rcp_precise(z_range);\n"
" float d = float(pos.z * rcp_precise(pos.w));\n"
" float new_d = (d - near_plane) * float(inv_range);\n"
" return vec4(pos.x, pos.y, (new_d * pos.w), pos.w);\n"
" const float real_n = min(far_plane, near_plane);\n"
" const float real_f = max(far_plane, near_plane);\n"
" const double depth_range = double(real_f - real_n);\n"
" const double inv_range = (depth_range > 0.0) ? (1.0 / (depth_range * pos.w)) : 0.0;\n"
" const double d = (double(pos.z) - real_n) * inv_range;\n"
" return vec4(pos.xy, float(d * pos.w), pos.w);\n"
" }\n"
" else\n"
" {\n"