dolphin/Source/Core/VideoCommon/RenderState.cpp

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// Copyright 2016 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "VideoCommon/RenderState.h"
#include <algorithm>
#include <array>
#include "VideoCommon/SamplerCommon.h"
void RasterizationState::Generate(const BPMemory& bp, PrimitiveType primitive_type)
{
cullmode = bp.genMode.cullmode;
primitive = primitive_type;
// Back-face culling should be disabled for points/lines.
if (primitive_type != PrimitiveType::Triangles && primitive_type != PrimitiveType::TriangleStrip)
cullmode = GenMode::CULL_NONE;
}
RasterizationState& RasterizationState::operator=(const RasterizationState& rhs)
{
hex = rhs.hex;
return *this;
}
void DepthState::Generate(const BPMemory& bp)
{
testenable = bp.zmode.testenable.Value();
updateenable = bp.zmode.updateenable.Value();
func = bp.zmode.func.Value();
}
DepthState& DepthState::operator=(const DepthState& rhs)
{
hex = rhs.hex;
return *this;
}
// If the framebuffer format has no alpha channel, it is assumed to
// ONE on blending. As the backends may emulate this framebuffer
// configuration with an alpha channel, we just drop all references
// to the destination alpha channel.
static BlendMode::BlendFactor RemoveDstAlphaUsage(BlendMode::BlendFactor factor)
{
switch (factor)
{
case BlendMode::DSTALPHA:
return BlendMode::ONE;
case BlendMode::INVDSTALPHA:
return BlendMode::ZERO;
default:
return factor;
}
}
// We separate the blending parameter for rgb and alpha. For blending
// the alpha component, CLR and ALPHA are indentical. So just always
// use ALPHA as this makes it easier for the backends to use the second
// alpha value of dual source blending.
static BlendMode::BlendFactor RemoveSrcColorUsage(BlendMode::BlendFactor factor)
{
switch (factor)
{
case BlendMode::SRCCLR:
return BlendMode::SRCALPHA;
case BlendMode::INVSRCCLR:
return BlendMode::INVSRCALPHA;
default:
return factor;
}
}
// Same as RemoveSrcColorUsage, but because of the overlapping enum,
// this must be written as another function.
static BlendMode::BlendFactor RemoveDstColorUsage(BlendMode::BlendFactor factor)
{
switch (factor)
{
case BlendMode::DSTCLR:
return BlendMode::DSTALPHA;
case BlendMode::INVDSTCLR:
return BlendMode::INVDSTALPHA;
default:
return factor;
}
}
void BlendingState::Generate(const BPMemory& bp)
{
// Start with everything disabled.
hex = 0;
bool target_has_alpha = bp.zcontrol.pixel_format == PEControl::RGBA6_Z24;
bool alpha_test_may_success = bp.alpha_test.TestResult() != AlphaTest::FAIL;
colorupdate = bp.blendmode.colorupdate && alpha_test_may_success;
alphaupdate = bp.blendmode.alphaupdate && target_has_alpha && alpha_test_may_success;
dstalpha = bp.dstalpha.enable && alphaupdate;
usedualsrc = true;
// The subtract bit has the highest priority
if (bp.blendmode.subtract)
{
blendenable = true;
subtractAlpha = subtract = true;
srcfactoralpha = srcfactor = BlendMode::ONE;
dstfactoralpha = dstfactor = BlendMode::ONE;
if (dstalpha)
{
subtractAlpha = false;
srcfactoralpha = BlendMode::ONE;
dstfactoralpha = BlendMode::ZERO;
}
}
// The blendenable bit has the middle priority
else if (bp.blendmode.blendenable)
{
blendenable = true;
srcfactor = bp.blendmode.srcfactor;
dstfactor = bp.blendmode.dstfactor;
if (!target_has_alpha)
{
// uses ONE instead of DSTALPHA
srcfactor = RemoveDstAlphaUsage(srcfactor);
dstfactor = RemoveDstAlphaUsage(dstfactor);
}
// replaces SRCCLR with SRCALPHA and DSTCLR with DSTALPHA, it is important to
// use the dst function for the src factor and vice versa
srcfactoralpha = RemoveDstColorUsage(srcfactor);
dstfactoralpha = RemoveSrcColorUsage(dstfactor);
if (dstalpha)
{
srcfactoralpha = BlendMode::ONE;
dstfactoralpha = BlendMode::ZERO;
}
}
// The logicop bit has the lowest priority
else if (bp.blendmode.logicopenable)
{
if (bp.blendmode.logicmode == BlendMode::NOOP)
{
// Fast path for Kirby's Return to Dreamland, they use it with dstAlpha.
colorupdate = false;
alphaupdate = alphaupdate && dstalpha;
}
else
{
logicopenable = true;
logicmode = bp.blendmode.logicmode;
if (dstalpha)
{
// TODO: Not supported by backends.
}
}
}
}
BlendingState& BlendingState::operator=(const BlendingState& rhs)
{
hex = rhs.hex;
return *this;
}
void SamplerState::Generate(const BPMemory& bp, u32 index)
{
const FourTexUnits& tex = bpmem.tex[index / 4];
const TexMode0& tm0 = tex.texMode0[index % 4];
const TexMode1& tm1 = tex.texMode1[index % 4];
// GX can configure the mip filter to none. However, D3D and Vulkan can't express this in their
// sampler states. Therefore, we set the min/max LOD to zero if this option is used.
min_filter = (tm0.min_filter & 4) != 0 ? Filter::Linear : Filter::Point;
mipmap_filter = (tm0.min_filter & 3) == TexMode0::TEXF_LINEAR ? Filter::Linear : Filter::Point;
mag_filter = tm0.mag_filter != 0 ? Filter::Linear : Filter::Point;
// If mipmaps are disabled, clamp min/max lod
max_lod = SamplerCommon::AreBpTexMode0MipmapsEnabled(tm0) ? tm1.max_lod : 0;
min_lod = std::min(max_lod.Value(), static_cast<u64>(tm1.min_lod));
lod_bias = SamplerCommon::AreBpTexMode0MipmapsEnabled(tm0) ? tm0.lod_bias * (256 / 32) : 0;
// Address modes
static constexpr std::array<AddressMode, 4> address_modes = {
{AddressMode::Clamp, AddressMode::Repeat, AddressMode::MirroredRepeat, AddressMode::Repeat}};
wrap_u = address_modes[tm0.wrap_s];
wrap_v = address_modes[tm0.wrap_t];
anisotropic_filtering = 0;
}
SamplerState& SamplerState::operator=(const SamplerState& rhs)
{
hex = rhs.hex;
return *this;
}
namespace RenderState
{
RasterizationState GetNoCullRasterizationState()
{
RasterizationState state = {};
state.cullmode = GenMode::CULL_NONE;
return state;
}
DepthState GetNoDepthTestingDepthStencilState()
{
DepthState state = {};
state.testenable = false;
state.updateenable = false;
state.func = ZMode::ALWAYS;
return state;
}
BlendingState GetNoBlendingBlendState()
{
BlendingState state = {};
state.usedualsrc = false;
state.blendenable = false;
state.srcfactor = BlendMode::ONE;
state.srcfactoralpha = BlendMode::ONE;
state.dstfactor = BlendMode::ZERO;
state.dstfactoralpha = BlendMode::ZERO;
state.logicopenable = false;
state.colorupdate = true;
state.alphaupdate = true;
return state;
}
SamplerState GetPointSamplerState()
{
SamplerState state = {};
state.min_filter = SamplerState::Filter::Point;
state.mag_filter = SamplerState::Filter::Point;
state.mipmap_filter = SamplerState::Filter::Point;
state.wrap_u = SamplerState::AddressMode::Clamp;
state.wrap_v = SamplerState::AddressMode::Clamp;
state.min_lod = 0;
state.max_lod = 255;
state.lod_bias = 0;
state.anisotropic_filtering = false;
return state;
}
SamplerState GetLinearSamplerState()
{
SamplerState state = {};
state.min_filter = SamplerState::Filter::Linear;
state.mag_filter = SamplerState::Filter::Linear;
state.mipmap_filter = SamplerState::Filter::Linear;
state.wrap_u = SamplerState::AddressMode::Clamp;
state.wrap_v = SamplerState::AddressMode::Clamp;
state.min_lod = 0;
state.max_lod = 255;
state.lod_bias = 0;
state.anisotropic_filtering = false;
return state;
}
}