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rsx: Reimplement MSAA transparency

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- Apply dither to edges that almost fail the straight-up alpha test
- Significantly improves alpha tested geometry far from the camera
- Also removes blend factor overrides/hacks as they give incorrect results due to background bleeding
This commit is contained in:
kd-11 2019-01-16 20:06:45 +03:00 • committed by kd-11
parent 10a17feda2
commit 6fdc0fd7f0
4 changed files with 54 additions and 70 deletions
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27
rpcs3/Emu/RSX/RSXThread.cpp
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@ -648,20 +648,21 @@ namespace rsx
//TODO: Properly support alpha-to-coverage and alpha-to-one behavior in shaders
auto fragment_alpha_func = rsx::method_registers.alpha_func();
auto alpha_ref = rsx::method_registers.alpha_ref() / 255.f;
auto rop_control = (u32)rsx::method_registers.alpha_test_enabled();
auto rop_control = rsx::method_registers.alpha_test_enabled()? 1u : 0u;
if (rsx::method_registers.msaa_alpha_to_coverage_enabled() && !rop_control)
if (rsx::method_registers.msaa_alpha_to_coverage_enabled() &&
rsx::method_registers.msaa_enabled() &&
rsx::method_registers.surface_antialias() != rsx::surface_antialiasing::center_1_sample)
{
if (rsx::method_registers.msaa_enabled() &&
rsx::method_registers.surface_antialias() != rsx::surface_antialiasing::center_1_sample)
{
//alpha values generate a coverage mask for order independent blending
//requires hardware AA to work properly (or just fragment sample stage in fragment shaders)
//simulated using combined alpha blend and alpha test
fragment_alpha_func = rsx::comparison_function::greater;
alpha_ref = rsx::method_registers.msaa_sample_mask()? 0.25f : 0.f;
rop_control |= (1 << 4);
}
// Alpha values generate a coverage mask for order independent blending
// Requires hardware AA to work properly (or just fragment sample stage in fragment shaders)
// Simulated using combined alpha blend and alpha test
const u32 mask_bit = rsx::method_registers.msaa_sample_mask() ? 1u : 0u;
const u32 samples_bit = rsx::method_registers.surface_antialias() != rsx::surface_antialiasing::diagonal_centered_2_samples ? 1u : 0u;
rop_control |= (1u << 4); // CSAA enable bit
rop_control |= (mask_bit << 5); // MSAA mask enable bit
rop_control |= (samples_bit << 6); // Sample configuration bit
}
const f32 fog0 = rsx::method_registers.fog_params_0();
@ -681,7 +682,7 @@ namespace rsx
case rsx::surface_color_format::x32:
break;
default:
rop_control |= 0x2;
rop_control |= (1u << 1);
break;
}
}