dolphin/Source/Core/VideoCommon/RenderState.cpp

397 lines
12 KiB
C++

// 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"
#include "VideoCommon/TextureConfig.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 = CullMode::None;
}
RasterizationState& RasterizationState::operator=(const RasterizationState& rhs)
{
hex = rhs.hex;
return *this;
}
FramebufferState& FramebufferState::operator=(const FramebufferState& 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 SrcBlendFactor RemoveDstAlphaUsage(SrcBlendFactor factor)
{
switch (factor)
{
case SrcBlendFactor::DstAlpha:
return SrcBlendFactor::One;
case SrcBlendFactor::InvDstAlpha:
return SrcBlendFactor::Zero;
default:
return factor;
}
}
static DstBlendFactor RemoveDstAlphaUsage(DstBlendFactor factor)
{
switch (factor)
{
case DstBlendFactor::DstAlpha:
return DstBlendFactor::One;
case DstBlendFactor::InvDstAlpha:
return DstBlendFactor::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 DstBlendFactor RemoveSrcColorUsage(DstBlendFactor factor)
{
switch (factor)
{
case DstBlendFactor::SrcClr:
return DstBlendFactor::SrcAlpha;
case DstBlendFactor::InvSrcClr:
return DstBlendFactor::InvSrcAlpha;
default:
return factor;
}
}
// Same as RemoveSrcColorUsage, but because of the overlapping enum,
// this must be written as another function.
static SrcBlendFactor RemoveDstColorUsage(SrcBlendFactor factor)
{
switch (factor)
{
case SrcBlendFactor::DstClr:
return SrcBlendFactor::DstAlpha;
case SrcBlendFactor::InvDstClr:
return SrcBlendFactor::InvDstAlpha;
default:
return factor;
}
}
void BlendingState::Generate(const BPMemory& bp)
{
// Start with everything disabled.
hex = 0;
bool target_has_alpha = bp.zcontrol.pixel_format == PixelFormat::RGBA6_Z24;
bool alpha_test_may_succeed = bp.alpha_test.TestResult() != AlphaTestResult::Fail;
colorupdate = bp.blendmode.colorupdate && alpha_test_may_succeed;
alphaupdate = bp.blendmode.alphaupdate && target_has_alpha && alpha_test_may_succeed;
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 = SrcBlendFactor::One;
dstfactoralpha = dstfactor = DstBlendFactor::One;
if (dstalpha)
{
subtractAlpha = false;
srcfactoralpha = SrcBlendFactor::One;
dstfactoralpha = DstBlendFactor::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 = SrcBlendFactor::One;
dstfactoralpha = DstBlendFactor::Zero;
}
}
// The logicop bit has the lowest priority
else if (bp.blendmode.logicopenable)
{
if (bp.blendmode.logicmode == LogicOp::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.
}
}
}
}
void BlendingState::ApproximateLogicOpWithBlending()
{
struct LogicOpApproximation
{
bool subtract;
SrcBlendFactor srcfactor;
DstBlendFactor dstfactor;
};
// TODO: This previously had a warning about SRC and DST being aliased and not to mix them,
// but INVSRCCLR and INVDSTCLR were also aliased and were mixed.
// Thus, NOR, EQUIV, INVERT, COPY_INVERTED, and OR_INVERTED duplicate(d) other values.
static constexpr std::array<LogicOpApproximation, 16> approximations = {{
{false, SrcBlendFactor::Zero, DstBlendFactor::Zero}, // CLEAR
{false, SrcBlendFactor::DstClr, DstBlendFactor::Zero}, // AND
{true, SrcBlendFactor::One, DstBlendFactor::InvSrcClr}, // AND_REVERSE
{false, SrcBlendFactor::One, DstBlendFactor::Zero}, // COPY
{true, SrcBlendFactor::DstClr, DstBlendFactor::One}, // AND_INVERTED
{false, SrcBlendFactor::Zero, DstBlendFactor::One}, // NOOP
{false, SrcBlendFactor::InvDstClr, DstBlendFactor::InvSrcClr}, // XOR
{false, SrcBlendFactor::InvDstClr, DstBlendFactor::One}, // OR
{false, SrcBlendFactor::InvDstClr, DstBlendFactor::InvSrcClr}, // NOR
{false, SrcBlendFactor::InvDstClr, DstBlendFactor::Zero}, // EQUIV
{false, SrcBlendFactor::InvDstClr, DstBlendFactor::InvSrcClr}, // INVERT
{false, SrcBlendFactor::One, DstBlendFactor::InvDstAlpha}, // OR_REVERSE
{false, SrcBlendFactor::InvDstClr, DstBlendFactor::InvSrcClr}, // COPY_INVERTED
{false, SrcBlendFactor::InvDstClr, DstBlendFactor::One}, // OR_INVERTED
{false, SrcBlendFactor::InvDstClr, DstBlendFactor::InvSrcClr}, // NAND
{false, SrcBlendFactor::One, DstBlendFactor::One}, // SET
}};
logicopenable = false;
blendenable = true;
subtract = approximations[u32(logicmode.Value())].subtract;
srcfactor = approximations[u32(logicmode.Value())].srcfactor;
dstfactor = approximations[u32(logicmode.Value())].dstfactor;
}
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 == FilterMode::Linear ? Filter::Linear : Filter::Point;
mipmap_filter = tm0.mipmap_filter == MipMode::Linear ? Filter::Linear : Filter::Point;
mag_filter = tm0.mag_filter == FilterMode::Linear ? Filter::Linear : Filter::Point;
// If mipmaps are disabled, clamp min/max lod
max_lod = SamplerCommon::AreBpTexMode0MipmapsEnabled(tm0) ? tm1.max_lod.Value() : 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[u32(tm0.wrap_s.Value())];
wrap_v = address_modes[u32(tm0.wrap_t.Value())];
anisotropic_filtering = 0;
}
SamplerState& SamplerState::operator=(const SamplerState& rhs)
{
hex = rhs.hex;
return *this;
}
namespace RenderState
{
RasterizationState GetInvalidRasterizationState()
{
RasterizationState state;
state.hex = UINT32_C(0xFFFFFFFF);
return state;
}
RasterizationState GetNoCullRasterizationState(PrimitiveType primitive)
{
RasterizationState state = {};
state.cullmode = CullMode::None;
state.primitive = primitive;
return state;
}
RasterizationState GetCullBackFaceRasterizationState(PrimitiveType primitive)
{
RasterizationState state = {};
state.cullmode = CullMode::Back;
state.primitive = primitive;
return state;
}
DepthState GetInvalidDepthState()
{
DepthState state;
state.hex = UINT32_C(0xFFFFFFFF);
return state;
}
DepthState GetNoDepthTestingDepthState()
{
DepthState state = {};
state.testenable = false;
state.updateenable = false;
state.func = CompareMode::Always;
return state;
}
DepthState GetAlwaysWriteDepthState()
{
DepthState state = {};
state.testenable = true;
state.updateenable = true;
state.func = CompareMode::Always;
return state;
}
BlendingState GetInvalidBlendingState()
{
BlendingState state;
state.hex = UINT32_C(0xFFFFFFFF);
return state;
}
BlendingState GetNoBlendingBlendState()
{
BlendingState state = {};
state.usedualsrc = false;
state.blendenable = false;
state.srcfactor = SrcBlendFactor::One;
state.srcfactoralpha = SrcBlendFactor::One;
state.dstfactor = DstBlendFactor::Zero;
state.dstfactoralpha = DstBlendFactor::Zero;
state.logicopenable = false;
state.colorupdate = true;
state.alphaupdate = true;
return state;
}
BlendingState GetNoColorWriteBlendState()
{
BlendingState state = {};
state.usedualsrc = false;
state.blendenable = false;
state.srcfactor = SrcBlendFactor::One;
state.srcfactoralpha = SrcBlendFactor::One;
state.dstfactor = DstBlendFactor::Zero;
state.dstfactoralpha = DstBlendFactor::Zero;
state.logicopenable = false;
state.colorupdate = false;
state.alphaupdate = false;
return state;
}
SamplerState GetInvalidSamplerState()
{
SamplerState state;
state.hex = UINT64_C(0xFFFFFFFFFFFFFFFF);
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;
}
FramebufferState GetColorFramebufferState(AbstractTextureFormat format)
{
FramebufferState state = {};
state.color_texture_format = format;
state.depth_texture_format = AbstractTextureFormat::Undefined;
state.per_sample_shading = false;
state.samples = 1;
return state;
}
FramebufferState GetRGBA8FramebufferState()
{
return GetColorFramebufferState(AbstractTextureFormat::RGBA8);
}
} // namespace RenderState