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VideoConfig: Replace FastDepthCalc by ForcedSlowDepth.

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Fast depth is now more accurate than slow depth and should always be used.
The option will be kept in a different form as it is still used as a hack to fix some games.
Also, the slow depth code path will still be relied upon by cards that don't support GL_ARB_clip_control.
This commit is contained in:
Jules Blok
2016-01-27 16:13:41 +01:00
parent 08c9e3b7a4
commit 9805f70913
6 changed files with 21 additions and 17 deletions
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24
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -285,13 +285,14 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
GenerateVSOutputMembers<T>(out, ApiType);
out.Write("};\n");
const bool forced_slow_depth = g_ActiveConfig.bForcedSlowDepth || !g_ActiveConfig.backend_info.bSupportsClipControl;
const bool forced_early_z = g_ActiveConfig.backend_info.bSupportsEarlyZ && bpmem.UseEarlyDepthTest()
&& (g_ActiveConfig.bFastDepthCalc || bpmem.alpha_test.TestResult() == AlphaTest::UNDETERMINED)
&& (!forced_slow_depth || bpmem.alpha_test.TestResult() == AlphaTest::UNDETERMINED)
// We can't allow early_ztest for zfreeze because depth is overridden per-pixel.
// This means it's impossible for zcomploc to be emulated on a zfrozen polygon.
&& !(bpmem.zmode.testenable && bpmem.genMode.zfreeze);
const bool per_pixel_depth = (bpmem.ztex2.op != ZTEXTURE_DISABLE && bpmem.UseLateDepthTest())
|| (!g_ActiveConfig.bFastDepthCalc && bpmem.zmode.testenable && !forced_early_z)
|| (forced_slow_depth && bpmem.zmode.testenable && !forced_early_z)
|| (bpmem.zmode.testenable && bpmem.genMode.zfreeze);
if (forced_early_z)
@ -324,7 +325,7 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
// D3D11 also has a way to force the driver to enable early-z, so we're fine here.
if(ApiType == API_OPENGL)
{
// This is a #define which signals whatever early-z method the driver supports.
// This is a #define which signals whatever early-z method the driver supports.
out.Write("FORCE_EARLY_Z; \n");
}
else
@ -332,7 +333,7 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
out.Write("[earlydepthstencil]\n");
}
}
else if (bpmem.UseEarlyDepthTest() && (g_ActiveConfig.bFastDepthCalc || bpmem.alpha_test.TestResult() == AlphaTest::UNDETERMINED))
else if (bpmem.UseEarlyDepthTest() && (!forced_slow_depth || bpmem.alpha_test.TestResult() == AlphaTest::UNDETERMINED))
{
static bool warn_once = true;
if (warn_once)
@ -561,11 +562,13 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
out.Write("\tint zCoord = int(" I_ZSLOPE".z + " I_ZSLOPE".x * screenpos.x + " I_ZSLOPE".y * screenpos.y);\n");
}
else if (!g_ActiveConfig.bFastDepthCalc)
else if (forced_slow_depth)
{
// FastDepth means to trust the depth generated in perspective division.
// It should be correct, but it seems not to be as accurate as required. TODO: Find out why!
// For disabled FastDepth we just calculate the depth value again.
// Due to floating point round-trip issues some depth equations are not as accurate as required.
// Depth equations used in D3D and OGL with GL_ARB_clip_control are accurate, but older cards
// that do not support GL_ARB_clip_control are not accurate enough under OGL. So on these older
// cards we just calculate the depth value again.
// The performance impact of this additional calculation doesn't matter, but it prevents
// the host GPU driver from performing any early depth test optimizations.
out.SetConstantsUsed(C_ZBIAS+1, C_ZBIAS+1);
@ -574,6 +577,7 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
}
else
{
// Our D3D backend uses inverse depth values, so we invert them to the expected value here.
if (ApiType == API_D3D)
out.Write("\tint zCoord = int((1.0 - rawpos.z) * 16777216.0);\n");
else
@ -587,7 +591,7 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
uid_data->ztex_op = bpmem.ztex2.op;
uid_data->per_pixel_depth = per_pixel_depth;
uid_data->forced_early_z = forced_early_z;
uid_data->fast_depth_calc = g_ActiveConfig.bFastDepthCalc;
uid_data->forced_slow_depth = forced_slow_depth;
uid_data->early_ztest = bpmem.UseEarlyDepthTest();
uid_data->fog_fsel = bpmem.fog.c_proj_fsel.fsel;
uid_data->zfreeze = bpmem.genMode.zfreeze;
@ -595,6 +599,7 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
// Note: z-textures are not written to depth buffer if early depth test is used
if (per_pixel_depth && bpmem.UseEarlyDepthTest())
{
// Our D3D backend uses inverse depth values, so we invert them back to the depth buffer value here.
if (ApiType == API_D3D)
out.Write("\tdepth = 1.0 - float(zCoord) / 16777216.0;\n");
else
@ -614,6 +619,7 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
if (per_pixel_depth && bpmem.UseLateDepthTest())
{
// Our D3D backend uses inverse depth values, so we invert them back to the depth buffer value here.
if (ApiType == API_D3D)
out.Write("\tdepth = 1.0 - float(zCoord) / 16777216.0;\n");
else