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PixelShaderGen.cpp
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PixelShaderGen.cpp
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// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "VideoCommon/PixelShaderGen.h"
#include <cmath>
#include <cstdio>
#include "Common/Assert.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
#include "VideoCommon/BPMemory.h"
#include "VideoCommon/BoundingBox.h"
#include "VideoCommon/DriverDetails.h"
#include "VideoCommon/LightingShaderGen.h"
#include "VideoCommon/NativeVertexFormat.h"
#include "VideoCommon/RenderState.h"
#include "VideoCommon/VertexLoaderManager.h"
#include "VideoCommon/VideoCommon.h"
#include "VideoCommon/VideoConfig.h"
#include "VideoCommon/XFMemory.h" // for texture projection mode
// TODO: Get rid of these
enum : u32
{
C_COLORMATRIX = 0, // 0
C_COLORS = 0, // 0
C_KCOLORS = C_COLORS + 4, // 4
C_ALPHA = C_KCOLORS + 4, // 8
C_TEXDIMS = C_ALPHA + 1, // 9
C_ZBIAS = C_TEXDIMS + 8, // 17
C_INDTEXSCALE = C_ZBIAS + 2, // 19
C_INDTEXMTX = C_INDTEXSCALE + 2, // 21
C_FOGCOLOR = C_INDTEXMTX + 6, // 27
C_FOGI = C_FOGCOLOR + 1, // 28
C_FOGF = C_FOGI + 1, // 29
C_ZSLOPE = C_FOGF + 2, // 31
C_EFBSCALE = C_ZSLOPE + 1, // 32
C_PENVCONST_END = C_EFBSCALE + 1
};
constexpr std::array<const char*, 32> tev_ksel_table_c{
"255,255,255", // 1 = 0x00
"223,223,223", // 7_8 = 0x01
"191,191,191", // 3_4 = 0x02
"159,159,159", // 5_8 = 0x03
"128,128,128", // 1_2 = 0x04
"96,96,96", // 3_8 = 0x05
"64,64,64", // 1_4 = 0x06
"32,32,32", // 1_8 = 0x07
"0,0,0", // INVALID = 0x08
"0,0,0", // INVALID = 0x09
"0,0,0", // INVALID = 0x0a
"0,0,0", // INVALID = 0x0b
I_KCOLORS "[0].rgb", // K0 = 0x0C
I_KCOLORS "[1].rgb", // K1 = 0x0D
I_KCOLORS "[2].rgb", // K2 = 0x0E
I_KCOLORS "[3].rgb", // K3 = 0x0F
I_KCOLORS "[0].rrr", // K0_R = 0x10
I_KCOLORS "[1].rrr", // K1_R = 0x11
I_KCOLORS "[2].rrr", // K2_R = 0x12
I_KCOLORS "[3].rrr", // K3_R = 0x13
I_KCOLORS "[0].ggg", // K0_G = 0x14
I_KCOLORS "[1].ggg", // K1_G = 0x15
I_KCOLORS "[2].ggg", // K2_G = 0x16
I_KCOLORS "[3].ggg", // K3_G = 0x17
I_KCOLORS "[0].bbb", // K0_B = 0x18
I_KCOLORS "[1].bbb", // K1_B = 0x19
I_KCOLORS "[2].bbb", // K2_B = 0x1A
I_KCOLORS "[3].bbb", // K3_B = 0x1B
I_KCOLORS "[0].aaa", // K0_A = 0x1C
I_KCOLORS "[1].aaa", // K1_A = 0x1D
I_KCOLORS "[2].aaa", // K2_A = 0x1E
I_KCOLORS "[3].aaa", // K3_A = 0x1F
};
constexpr std::array<const char*, 32> tev_ksel_table_a{
"255", // 1 = 0x00
"223", // 7_8 = 0x01
"191", // 3_4 = 0x02
"159", // 5_8 = 0x03
"128", // 1_2 = 0x04
"96", // 3_8 = 0x05
"64", // 1_4 = 0x06
"32", // 1_8 = 0x07
"0", // INVALID = 0x08
"0", // INVALID = 0x09
"0", // INVALID = 0x0a
"0", // INVALID = 0x0b
"0", // INVALID = 0x0c
"0", // INVALID = 0x0d
"0", // INVALID = 0x0e
"0", // INVALID = 0x0f
I_KCOLORS "[0].r", // K0_R = 0x10
I_KCOLORS "[1].r", // K1_R = 0x11
I_KCOLORS "[2].r", // K2_R = 0x12
I_KCOLORS "[3].r", // K3_R = 0x13
I_KCOLORS "[0].g", // K0_G = 0x14
I_KCOLORS "[1].g", // K1_G = 0x15
I_KCOLORS "[2].g", // K2_G = 0x16
I_KCOLORS "[3].g", // K3_G = 0x17
I_KCOLORS "[0].b", // K0_B = 0x18
I_KCOLORS "[1].b", // K1_B = 0x19
I_KCOLORS "[2].b", // K2_B = 0x1A
I_KCOLORS "[3].b", // K3_B = 0x1B
I_KCOLORS "[0].a", // K0_A = 0x1C
I_KCOLORS "[1].a", // K1_A = 0x1D
I_KCOLORS "[2].a", // K2_A = 0x1E
I_KCOLORS "[3].a", // K3_A = 0x1F
};
constexpr std::array<const char*, 16> tev_c_input_table{
"prev.rgb", // CPREV,
"prev.aaa", // APREV,
"c0.rgb", // C0,
"c0.aaa", // A0,
"c1.rgb", // C1,
"c1.aaa", // A1,
"c2.rgb", // C2,
"c2.aaa", // A2,
"textemp.rgb", // TEXC,
"textemp.aaa", // TEXA,
"rastemp.rgb", // RASC,
"rastemp.aaa", // RASA,
"int3(255,255,255)", // ONE
"int3(128,128,128)", // HALF
"konsttemp.rgb", // KONST
"int3(0,0,0)", // ZERO
};
constexpr std::array<const char*, 8> tev_a_input_table{
"prev.a", // APREV,
"c0.a", // A0,
"c1.a", // A1,
"c2.a", // A2,
"textemp.a", // TEXA,
"rastemp.a", // RASA,
"konsttemp.a", // KONST, (hw1 had quarter)
"0", // ZERO
};
constexpr std::array<const char*, 8> tev_ras_table{
"iround(col0 * 255.0)",
"iround(col1 * 255.0)",
"ERROR13", // 2
"ERROR14", // 3
"ERROR15", // 4
"(int4(1, 1, 1, 1) * alphabump)", // bump alpha (0..248)
"(int4(1, 1, 1, 1) * (alphabump | (alphabump >> 5)))", // normalized bump alpha (0..255)
"int4(0, 0, 0, 0)", // zero
};
constexpr std::array<const char*, 4> tev_c_output_table{
"prev.rgb",
"c0.rgb",
"c1.rgb",
"c2.rgb",
};
constexpr std::array<const char*, 4> tev_a_output_table{
"prev.a",
"c0.a",
"c1.a",
"c2.a",
};
// FIXME: Some of the video card's capabilities (BBox support, EarlyZ support, dstAlpha support)
// leak into this UID; This is really unhelpful if these UIDs ever move from one machine to
// another.
PixelShaderUid GetPixelShaderUid()
{
PixelShaderUid out;
pixel_shader_uid_data* const uid_data = out.GetUidData();
uid_data->useDstAlpha = bpmem.dstalpha.enable && bpmem.blendmode.alphaupdate &&
bpmem.zcontrol.pixel_format == PixelFormat::RGBA6_Z24;
uid_data->genMode_numindstages = bpmem.genMode.numindstages;
uid_data->genMode_numtevstages = bpmem.genMode.numtevstages;
uid_data->genMode_numtexgens = bpmem.genMode.numtexgens;
uid_data->bounding_box = g_ActiveConfig.bBBoxEnable && BoundingBox::IsEnabled();
uid_data->rgba6_format =
bpmem.zcontrol.pixel_format == PixelFormat::RGBA6_Z24 && !g_ActiveConfig.bForceTrueColor;
uid_data->dither = bpmem.blendmode.dither && uid_data->rgba6_format;
uid_data->uint_output = bpmem.blendmode.UseLogicOp();
u32 numStages = uid_data->genMode_numtevstages + 1;
const bool forced_early_z =
bpmem.UseEarlyDepthTest() &&
(g_ActiveConfig.bFastDepthCalc ||
bpmem.alpha_test.TestResult() == AlphaTestResult::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 != ZTexOp::Disabled && bpmem.UseLateDepthTest()) ||
(!g_ActiveConfig.bFastDepthCalc && bpmem.zmode.testenable && !forced_early_z) ||
(bpmem.zmode.testenable && bpmem.genMode.zfreeze);
uid_data->per_pixel_depth = per_pixel_depth;
uid_data->forced_early_z = forced_early_z;
if (g_ActiveConfig.bEnablePixelLighting)
{
uid_data->numColorChans = xfmem.numChan.numColorChans;
GetLightingShaderUid(uid_data->lighting);
}
if (uid_data->genMode_numtexgens > 0)
{
for (unsigned int i = 0; i < uid_data->genMode_numtexgens; ++i)
{
// optional perspective divides
uid_data->texMtxInfo_n_projection |= static_cast<u32>(xfmem.texMtxInfo[i].projection.Value())
<< i;
}
}
// indirect texture map lookup
int nIndirectStagesUsed = 0;
if (uid_data->genMode_numindstages > 0)
{
for (unsigned int i = 0; i < numStages; ++i)
{
if (bpmem.tevind[i].IsActive() && bpmem.tevind[i].bt < uid_data->genMode_numindstages)
nIndirectStagesUsed |= 1 << bpmem.tevind[i].bt;
}
}
uid_data->nIndirectStagesUsed = nIndirectStagesUsed;
for (u32 i = 0; i < uid_data->genMode_numindstages; ++i)
{
if (uid_data->nIndirectStagesUsed & (1 << i))
uid_data->SetTevindrefValues(i, bpmem.tevindref.getTexCoord(i), bpmem.tevindref.getTexMap(i));
}
for (unsigned int n = 0; n < numStages; n++)
{
int texcoord = bpmem.tevorders[n / 2].getTexCoord(n & 1);
bool bHasTexCoord = (u32)texcoord < bpmem.genMode.numtexgens;
// HACK to handle cases where the tex gen is not enabled
if (!bHasTexCoord)
texcoord = bpmem.genMode.numtexgens;
uid_data->stagehash[n].hasindstage = bpmem.tevind[n].bt < bpmem.genMode.numindstages;
uid_data->stagehash[n].tevorders_texcoord = texcoord;
if (uid_data->stagehash[n].hasindstage)
uid_data->stagehash[n].tevind = bpmem.tevind[n].hex;
TevStageCombiner::ColorCombiner& cc = bpmem.combiners[n].colorC;
TevStageCombiner::AlphaCombiner& ac = bpmem.combiners[n].alphaC;
uid_data->stagehash[n].cc = cc.hex & 0xFFFFFF;
uid_data->stagehash[n].ac = ac.hex & 0xFFFFF0; // Storing rswap and tswap later
if (cc.a == TevColorArg::RasAlpha || cc.a == TevColorArg::RasColor ||
cc.b == TevColorArg::RasAlpha || cc.b == TevColorArg::RasColor ||
cc.c == TevColorArg::RasAlpha || cc.c == TevColorArg::RasColor ||
cc.d == TevColorArg::RasAlpha || cc.d == TevColorArg::RasColor ||
ac.a == TevAlphaArg::RasAlpha || ac.b == TevAlphaArg::RasAlpha ||
ac.c == TevAlphaArg::RasAlpha || ac.d == TevAlphaArg::RasAlpha)
{
const int i = bpmem.combiners[n].alphaC.rswap;
uid_data->stagehash[n].tevksel_swap1a = bpmem.tevksel[i * 2].swap1;
uid_data->stagehash[n].tevksel_swap2a = bpmem.tevksel[i * 2].swap2;
uid_data->stagehash[n].tevksel_swap1b = bpmem.tevksel[i * 2 + 1].swap1;
uid_data->stagehash[n].tevksel_swap2b = bpmem.tevksel[i * 2 + 1].swap2;
uid_data->stagehash[n].tevorders_colorchan = bpmem.tevorders[n / 2].getColorChan(n & 1);
}
uid_data->stagehash[n].tevorders_enable = bpmem.tevorders[n / 2].getEnable(n & 1);
if (uid_data->stagehash[n].tevorders_enable)
{
const int i = bpmem.combiners[n].alphaC.tswap;
uid_data->stagehash[n].tevksel_swap1c = bpmem.tevksel[i * 2].swap1;
uid_data->stagehash[n].tevksel_swap2c = bpmem.tevksel[i * 2].swap2;
uid_data->stagehash[n].tevksel_swap1d = bpmem.tevksel[i * 2 + 1].swap1;
uid_data->stagehash[n].tevksel_swap2d = bpmem.tevksel[i * 2 + 1].swap2;
uid_data->stagehash[n].tevorders_texmap = bpmem.tevorders[n / 2].getTexMap(n & 1);
}
if (cc.a == TevColorArg::Konst || cc.b == TevColorArg::Konst || cc.c == TevColorArg::Konst ||
cc.d == TevColorArg::Konst || ac.a == TevAlphaArg::Konst || ac.b == TevAlphaArg::Konst ||
ac.c == TevAlphaArg::Konst || ac.d == TevAlphaArg::Konst)
{
uid_data->stagehash[n].tevksel_kc = bpmem.tevksel[n / 2].getKC(n & 1);
uid_data->stagehash[n].tevksel_ka = bpmem.tevksel[n / 2].getKA(n & 1);
}
}
#define MY_STRUCT_OFFSET(str, elem) ((u32)((u64) & (str).elem - (u64) & (str)))
uid_data->num_values = (g_ActiveConfig.bEnablePixelLighting) ?
sizeof(*uid_data) :
MY_STRUCT_OFFSET(*uid_data, stagehash[numStages]);
uid_data->Pretest = bpmem.alpha_test.TestResult();
uid_data->late_ztest = bpmem.UseLateDepthTest();
// NOTE: Fragment may not be discarded if alpha test always fails and early depth test is enabled
// (in this case we need to write a depth value if depth test passes regardless of the alpha
// testing result)
if (uid_data->Pretest == AlphaTestResult::Undetermined ||
(uid_data->Pretest == AlphaTestResult::Fail && uid_data->late_ztest))
{
uid_data->alpha_test_comp0 = bpmem.alpha_test.comp0;
uid_data->alpha_test_comp1 = bpmem.alpha_test.comp1;
uid_data->alpha_test_logic = bpmem.alpha_test.logic;
// ZCOMPLOC HACK:
// The only way to emulate alpha test + early-z is to force early-z in the shader.
// As this isn't available on all drivers and as we can't emulate this feature otherwise,
// we are only able to choose which one we want to respect more.
// Tests seem to have proven that writing depth even when the alpha test fails is more
// important that a reliable alpha test, so we just force the alpha test to always succeed.
// At least this seems to be less buggy.
uid_data->alpha_test_use_zcomploc_hack =
bpmem.UseEarlyDepthTest() && bpmem.zmode.updateenable &&
!g_ActiveConfig.backend_info.bSupportsEarlyZ && !bpmem.genMode.zfreeze;
}
uid_data->zfreeze = bpmem.genMode.zfreeze;
uid_data->ztex_op = bpmem.ztex2.op;
uid_data->early_ztest = bpmem.UseEarlyDepthTest();
uid_data->fog_fsel = bpmem.fog.c_proj_fsel.fsel;
uid_data->fog_proj = bpmem.fog.c_proj_fsel.proj;
uid_data->fog_RangeBaseEnabled = bpmem.fogRange.Base.Enabled;
BlendingState state = {};
state.Generate(bpmem);
if (state.usedualsrc && state.dstalpha && g_ActiveConfig.backend_info.bSupportsFramebufferFetch &&
!g_ActiveConfig.backend_info.bSupportsDualSourceBlend)
{
uid_data->blend_enable = state.blendenable;
uid_data->blend_src_factor = state.srcfactor;
uid_data->blend_src_factor_alpha = state.srcfactoralpha;
uid_data->blend_dst_factor = state.dstfactor;
uid_data->blend_dst_factor_alpha = state.dstfactoralpha;
uid_data->blend_subtract = state.subtract;
uid_data->blend_subtract_alpha = state.subtractAlpha;
}
return out;
}
void ClearUnusedPixelShaderUidBits(APIType api_type, const ShaderHostConfig& host_config,
PixelShaderUid* uid)
{
pixel_shader_uid_data* const uid_data = uid->GetUidData();
// OpenGL and Vulkan convert implicitly normalized color outputs to their uint representation.
// Therefore, it is not necessary to use a uint output on these backends. We also disable the
// uint output when logic op is not supported (i.e. driver/device does not support D3D11.1).
if (api_type != APIType::D3D || !host_config.backend_logic_op)
uid_data->uint_output = 0;
// If bounding box is enabled when a UID cache is created, then later disabled, we shouldn't
// emit the bounding box portion of the shader.
uid_data->bounding_box &= host_config.bounding_box & host_config.backend_bbox;
}
void WritePixelShaderCommonHeader(ShaderCode& out, APIType api_type, u32 num_texgens,
const ShaderHostConfig& host_config, bool bounding_box)
{
// dot product for integer vectors
out.Write("int idot(int3 x, int3 y)\n"
"{{\n"
"\tint3 tmp = x * y;\n"
"\treturn tmp.x + tmp.y + tmp.z;\n"
"}}\n");
out.Write("int idot(int4 x, int4 y)\n"
"{{\n"
"\tint4 tmp = x * y;\n"
"\treturn tmp.x + tmp.y + tmp.z + tmp.w;\n"
"}}\n\n");
// rounding + casting to integer at once in a single function
out.Write("int iround(float x) {{ return int (round(x)); }}\n"
"int2 iround(float2 x) {{ return int2(round(x)); }}\n"
"int3 iround(float3 x) {{ return int3(round(x)); }}\n"
"int4 iround(float4 x) {{ return int4(round(x)); }}\n\n");
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
{
out.Write("SAMPLER_BINDING(0) uniform sampler2DArray samp[8];\n");
}
else // D3D
{
// Declare samplers
out.Write("SamplerState samp[8] : register(s0);\n"
"\n"
"Texture2DArray Tex[8] : register(t0);\n");
}
out.Write("\n");
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
out.Write("UBO_BINDING(std140, 1) uniform PSBlock {{\n");
else
out.Write("cbuffer PSBlock : register(b0) {{\n");
out.Write("\tint4 " I_COLORS "[4];\n"
"\tint4 " I_KCOLORS "[4];\n"
"\tint4 " I_ALPHA ";\n"
"\tfloat4 " I_TEXDIMS "[8];\n"
"\tint4 " I_ZBIAS "[2];\n"
"\tint4 " I_INDTEXSCALE "[2];\n"
"\tint4 " I_INDTEXMTX "[6];\n"
"\tint4 " I_FOGCOLOR ";\n"
"\tint4 " I_FOGI ";\n"
"\tfloat4 " I_FOGF ";\n"
"\tfloat4 " I_FOGRANGE "[3];\n"
"\tfloat4 " I_ZSLOPE ";\n"
"\tfloat2 " I_EFBSCALE ";\n"
"\tuint bpmem_genmode;\n"
"\tuint bpmem_alphaTest;\n"
"\tuint bpmem_fogParam3;\n"
"\tuint bpmem_fogRangeBase;\n"
"\tuint bpmem_dstalpha;\n"
"\tuint bpmem_ztex_op;\n"
"\tbool bpmem_late_ztest;\n"
"\tbool bpmem_rgba6_format;\n"
"\tbool bpmem_dither;\n"
"\tbool bpmem_bounding_box;\n"
"\tuint4 bpmem_pack1[16];\n" // .xy - combiners, .z - tevind
"\tuint4 bpmem_pack2[8];\n" // .x - tevorder, .y - tevksel
"\tint4 konstLookup[32];\n"
"\tbool blend_enable;\n"
"\tuint blend_src_factor;\n"
"\tuint blend_src_factor_alpha;\n"
"\tuint blend_dst_factor;\n"
"\tuint blend_dst_factor_alpha;\n"
"\tbool blend_subtract;\n"
"\tbool blend_subtract_alpha;\n"
"}};\n\n");
out.Write("#define bpmem_combiners(i) (bpmem_pack1[(i)].xy)\n"
"#define bpmem_tevind(i) (bpmem_pack1[(i)].z)\n"
"#define bpmem_iref(i) (bpmem_pack1[(i)].w)\n"
"#define bpmem_tevorder(i) (bpmem_pack2[(i)].x)\n"
"#define bpmem_tevksel(i) (bpmem_pack2[(i)].y)\n\n");
if (host_config.per_pixel_lighting)
{
out.Write("{}", s_lighting_struct);
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
out.Write("UBO_BINDING(std140, 2) uniform VSBlock {{\n");
else
out.Write("cbuffer VSBlock : register(b1) {{\n");
out.Write("{}", s_shader_uniforms);
out.Write("}};\n");
}
if (bounding_box)
{
out.Write(R"(
#ifdef API_D3D
globallycoherent RWBuffer<int> bbox_data : register(u2);
#define atomicMin InterlockedMin
#define atomicMax InterlockedMax
#define bbox_left bbox_data[0]
#define bbox_right bbox_data[1]
#define bbox_top bbox_data[2]
#define bbox_bottom bbox_data[3]
#else
SSBO_BINDING(0) buffer BBox {{
int bbox_left, bbox_right, bbox_top, bbox_bottom;
}};
#endif
void UpdateBoundingBoxBuffer(int2 min_pos, int2 max_pos) {{
if (bbox_left > min_pos.x)
atomicMin(bbox_left, min_pos.x);
if (bbox_right < max_pos.x)
atomicMax(bbox_right, max_pos.x);
if (bbox_top > min_pos.y)
atomicMin(bbox_top, min_pos.y);
if (bbox_bottom < max_pos.y)
atomicMax(bbox_bottom, max_pos.y);
}}
void UpdateBoundingBox(float2 rawpos) {{
// The pixel center in the GameCube GPU is 7/12, not 0.5 (see VertexShaderGen.cpp)
// Adjust for this by unapplying the offset we added in the vertex shader.
const float PIXEL_CENTER_OFFSET = 7.0 / 12.0 - 0.5;
float2 offset = float2(PIXEL_CENTER_OFFSET, -PIXEL_CENTER_OFFSET);
#ifdef API_OPENGL
// OpenGL lower-left origin means that Y goes in the opposite direction.
offset.y = -offset.y;
#endif
// The rightmost shaded pixel is not included in the right bounding box register,
// such that width = right - left + 1. This has been verified on hardware.
int2 pos = iround(rawpos * cefbscale + offset);
#ifdef SUPPORTS_SUBGROUP_REDUCTION
if (CAN_USE_SUBGROUP_REDUCTION) {{
int2 min_pos = IS_HELPER_INVOCATION ? int2(2147483647, 2147483647) : pos;
int2 max_pos = IS_HELPER_INVOCATION ? int2(-2147483648, -2147483648) : pos;
SUBGROUP_MIN(min_pos);
SUBGROUP_MAX(max_pos);
if (IS_FIRST_ACTIVE_INVOCATION)
UpdateBoundingBoxBuffer(min_pos, max_pos);
}} else {{
UpdateBoundingBoxBuffer(pos, pos);
}}
#else
UpdateBoundingBoxBuffer(pos, pos);
#endif
}}
)");
}
}
static void WriteStage(ShaderCode& out, const pixel_shader_uid_data* uid_data, int n,
APIType api_type, bool stereo);
static void WriteTevRegular(ShaderCode& out, std::string_view components, TevBias bias, TevOp op,
bool clamp, TevScale scale, bool alpha);
static void SampleTexture(ShaderCode& out, std::string_view texcoords, std::string_view texswap,
int texmap, bool stereo, APIType api_type);
static void WriteAlphaTest(ShaderCode& out, const pixel_shader_uid_data* uid_data, APIType api_type,
bool per_pixel_depth, bool use_dual_source);
static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data);
static void WriteColor(ShaderCode& out, APIType api_type, const pixel_shader_uid_data* uid_data,
bool use_dual_source);
static void WriteBlend(ShaderCode& out, const pixel_shader_uid_data* uid_data);
ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& host_config,
const pixel_shader_uid_data* uid_data)
{
ShaderCode out;
const bool per_pixel_lighting = g_ActiveConfig.bEnablePixelLighting;
const bool msaa = host_config.msaa;
const bool ssaa = host_config.ssaa;
const bool stereo = host_config.stereo;
const u32 numStages = uid_data->genMode_numtevstages + 1;
out.Write("// Pixel Shader for TEV stages\n");
out.Write("// {} TEV stages, {} texgens, {} IND stages\n", numStages,
uid_data->genMode_numtexgens, uid_data->genMode_numindstages);
// Stuff that is shared between ubershaders and pixelgen.
WritePixelShaderCommonHeader(out, api_type, uid_data->genMode_numtexgens, host_config,
uid_data->bounding_box);
if (uid_data->forced_early_z && g_ActiveConfig.backend_info.bSupportsEarlyZ)
{
// Zcomploc (aka early_ztest) is a way to control whether depth test is done before
// or after texturing and alpha test. PC graphics APIs used to provide no way to emulate
// this feature properly until 2012: Depth tests were always done after alpha testing.
// Most importantly, it was not possible to write to the depth buffer without also writing
// a color value (unless color writing was disabled altogether).
// OpenGL 4.2 actually provides two extensions which can force an early z test:
// * ARB_image_load_store has 'layout(early_fragment_tests)' which forces the driver to do z
// and stencil tests early.
// * ARB_conservative_depth has 'layout(depth_unchanged) which signals to the driver that it
// can make optimisations
// which assume the pixel shader won't update the depth buffer.
// early_fragment_tests is the best option, as it requires the driver to do early-z and defines
// early-z exactly as
// we expect, with discard causing the shader to exit with only the depth buffer updated.
// Conservative depth's 'depth_unchanged' only hints to the driver that an early-z optimisation
// can be made and
// doesn't define what will happen if we discard the fragment. But the way modern graphics
// hardware is implemented
// means it is not unreasonable to expect the same behaviour as early_fragment_tests.
// We can also assume that if a driver has gone out of its way to support conservative depth and
// not image_load_store
// as required by OpenGL 4.2 that it will be doing the optimisation.
// If the driver doesn't actually do an early z optimisation, ZCompLoc will be broken and depth
// will only be written
// if the alpha test passes.
// We support Conservative as a fallback, because many drivers based on Mesa haven't implemented
// all of the
// ARB_image_load_store extension yet.
// D3D11 also has a way to force the driver to enable early-z, so we're fine here.
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
{
// This is a #define which signals whatever early-z method the driver supports.
out.Write("FORCE_EARLY_Z; \n");
}
else
{
out.Write("[earlydepthstencil]\n");
}
}
// Only use dual-source blending when required on drivers that don't support it very well.
const bool use_dual_source =
host_config.backend_dual_source_blend &&
(!DriverDetails::HasBug(DriverDetails::BUG_BROKEN_DUAL_SOURCE_BLENDING) ||
uid_data->useDstAlpha);
const bool use_shader_blend =
!use_dual_source && (uid_data->useDstAlpha && host_config.backend_shader_framebuffer_fetch);
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
{
if (use_dual_source)
{
if (DriverDetails::HasBug(DriverDetails::BUG_BROKEN_FRAGMENT_SHADER_INDEX_DECORATION))
{
out.Write("FRAGMENT_OUTPUT_LOCATION(0) out vec4 ocol0;\n"
"FRAGMENT_OUTPUT_LOCATION(1) out vec4 ocol1;\n");
}
else
{
out.Write("FRAGMENT_OUTPUT_LOCATION_INDEXED(0, 0) out vec4 ocol0;\n"
"FRAGMENT_OUTPUT_LOCATION_INDEXED(0, 1) out vec4 ocol1;\n");
}
}
else if (use_shader_blend)
{
// QComm's Adreno driver doesn't seem to like using the framebuffer_fetch value as an
// intermediate value with multiple reads & modifications, so pull out the "real" output value
// and use a temporary for calculations, then set the output value once at the end of the
// shader
if (DriverDetails::HasBug(DriverDetails::BUG_BROKEN_FRAGMENT_SHADER_INDEX_DECORATION))
{
out.Write("FRAGMENT_OUTPUT_LOCATION(0) FRAGMENT_INOUT vec4 real_ocol0;\n");
}
else
{
out.Write("FRAGMENT_OUTPUT_LOCATION_INDEXED(0, 0) FRAGMENT_INOUT vec4 real_ocol0;\n");
}
}
else
{
out.Write("FRAGMENT_OUTPUT_LOCATION(0) out vec4 ocol0;\n");
}
if (uid_data->per_pixel_depth)
out.Write("#define depth gl_FragDepth\n");
if (host_config.backend_geometry_shaders)
{
out.Write("VARYING_LOCATION(0) in VertexData {{\n");
GenerateVSOutputMembers(out, api_type, uid_data->genMode_numtexgens, host_config,
GetInterpolationQualifier(msaa, ssaa, true, true));
if (stereo)
out.Write("\tflat int layer;\n");
out.Write("}};\n");
}
else
{
// Let's set up attributes
u32 counter = 0;
out.Write("VARYING_LOCATION({}) {} in float4 colors_0;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
out.Write("VARYING_LOCATION({}) {} in float4 colors_1;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
for (u32 i = 0; i < uid_data->genMode_numtexgens; ++i)
{
out.Write("VARYING_LOCATION({}) {} in float3 tex{};\n", counter++,
GetInterpolationQualifier(msaa, ssaa), i);
}
if (!host_config.fast_depth_calc)
{
out.Write("VARYING_LOCATION({}) {} in float4 clipPos;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
}
if (per_pixel_lighting)
{
out.Write("VARYING_LOCATION({}) {} in float3 Normal;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
out.Write("VARYING_LOCATION({}) {} in float3 WorldPos;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
}
}
out.Write("void main()\n{{\n");
out.Write("\tfloat4 rawpos = gl_FragCoord;\n");
if (use_shader_blend)
{
// Store off a copy of the initial fb value for blending
out.Write("\tfloat4 initial_ocol0 = FB_FETCH_VALUE;\n"
"\tfloat4 ocol0;\n"
"\tfloat4 ocol1;\n");
}
}
else // D3D
{
out.Write("void main(\n");
if (uid_data->uint_output)
{
out.Write(" out uint4 ocol0 : SV_Target,\n");
}
else
{
out.Write(" out float4 ocol0 : SV_Target0,\n"
" out float4 ocol1 : SV_Target1,\n");
}
out.Write("{}"
" in float4 rawpos : SV_Position,\n",
uid_data->per_pixel_depth ? " out float depth : SV_Depth,\n" : "");
out.Write(" in {} float4 colors_0 : COLOR0,\n", GetInterpolationQualifier(msaa, ssaa));
out.Write(" in {} float4 colors_1 : COLOR1\n", GetInterpolationQualifier(msaa, ssaa));
// compute window position if needed because binding semantic WPOS is not widely supported
for (u32 i = 0; i < uid_data->genMode_numtexgens; ++i)
{
out.Write(",\n in {} float3 tex{} : TEXCOORD{}", GetInterpolationQualifier(msaa, ssaa), i,
i);
}
if (!host_config.fast_depth_calc)
{
out.Write(",\n in {} float4 clipPos : TEXCOORD{}", GetInterpolationQualifier(msaa, ssaa),
uid_data->genMode_numtexgens);
}
if (per_pixel_lighting)
{
out.Write(",\n in {} float3 Normal : TEXCOORD{}", GetInterpolationQualifier(msaa, ssaa),
uid_data->genMode_numtexgens + 1);
out.Write(",\n in {} float3 WorldPos : TEXCOORD{}", GetInterpolationQualifier(msaa, ssaa),
uid_data->genMode_numtexgens + 2);
}
if (host_config.backend_geometry_shaders)
{
out.Write(",\n in float clipDist0 : SV_ClipDistance0\n"
",\n in float clipDist1 : SV_ClipDistance1\n");
}
if (stereo)
out.Write(",\n in uint layer : SV_RenderTargetArrayIndex\n");
out.Write(" ) {{\n");
}
out.Write("\tint4 c0 = " I_COLORS "[1], c1 = " I_COLORS "[2], c2 = " I_COLORS
"[3], prev = " I_COLORS "[0];\n"
"\tint4 rastemp = int4(0, 0, 0, 0), textemp = int4(0, 0, 0, 0), konsttemp = int4(0, 0, "
"0, 0);\n"
"\tint3 comp16 = int3(1, 256, 0), comp24 = int3(1, 256, 256*256);\n"
"\tint alphabump=0;\n"
"\tint3 tevcoord=int3(0, 0, 0);\n"
"\tint2 wrappedcoord=int2(0,0), tempcoord=int2(0,0);\n"
"\tint4 "
"tevin_a=int4(0,0,0,0),tevin_b=int4(0,0,0,0),tevin_c=int4(0,0,0,0),tevin_d=int4(0,0,0,"
"0);\n\n"); // tev combiner inputs
// On GLSL, input variables must not be assigned to.
// This is why we declare these variables locally instead.
out.Write("\tfloat4 col0 = colors_0;\n"
"\tfloat4 col1 = colors_1;\n");
if (per_pixel_lighting)
{
out.Write("\tfloat3 _norm0 = normalize(Normal.xyz);\n\n"
"\tfloat3 pos = WorldPos;\n");
out.Write("\tint4 lacc;\n"
"\tfloat3 ldir, h, cosAttn, distAttn;\n"
"\tfloat dist, dist2, attn;\n");
// TODO: Our current constant usage code isn't able to handle more than one buffer.
// So we can't mark the VS constant as used here. But keep them here as reference.
// out.SetConstantsUsed(C_PLIGHT_COLORS, C_PLIGHT_COLORS+7); // TODO: Can be optimized further
// out.SetConstantsUsed(C_PLIGHTS, C_PLIGHTS+31); // TODO: Can be optimized further
// out.SetConstantsUsed(C_PMATERIALS, C_PMATERIALS+3);
GenerateLightingShaderCode(out, uid_data->lighting, "colors_", "col");
if (uid_data->numColorChans == 0)
out.Write("col0 = float4(0.0, 0.0, 0.0, 0.0);\n");
if (uid_data->numColorChans <= 1)
out.Write("col1 = float4(0.0, 0.0, 0.0, 0.0);\n");
}
// HACK to handle cases where the tex gen is not enabled
if (uid_data->genMode_numtexgens == 0)
{
out.Write("\tint2 fixpoint_uv0 = int2(0, 0);\n\n");
}
else
{
out.SetConstantsUsed(C_TEXDIMS, C_TEXDIMS + uid_data->genMode_numtexgens - 1);
for (u32 i = 0; i < uid_data->genMode_numtexgens; ++i)
{
out.Write("\tint2 fixpoint_uv{} = int2(", i);
out.Write("(tex{}.z == 0.0 ? tex{}.xy : tex{}.xy / tex{}.z)", i, i, i, i);
out.Write(" * " I_TEXDIMS "[{}].zw);\n", i);
// TODO: S24 overflows here?
}
}
for (u32 i = 0; i < uid_data->genMode_numindstages; ++i)
{
if ((uid_data->nIndirectStagesUsed & (1U << i)) != 0)
{
const u32 texcoord = uid_data->GetTevindirefCoord(i);
const u32 texmap = uid_data->GetTevindirefMap(i);
if (texcoord < uid_data->genMode_numtexgens)
{
out.SetConstantsUsed(C_INDTEXSCALE + i / 2, C_INDTEXSCALE + i / 2);
out.Write("\ttempcoord = fixpoint_uv{} >> " I_INDTEXSCALE "[{}].{};\n", texcoord, i / 2,
(i & 1) != 0 ? "zw" : "xy");
}
else
{
out.Write("\ttempcoord = int2(0, 0);\n");
}
out.Write("\tint3 iindtex{} = ", i);
SampleTexture(out, "float2(tempcoord)", "abg", texmap, stereo, api_type);
}
}
for (u32 i = 0; i < numStages; i++)
{
// Build the equation for this stage
WriteStage(out, uid_data, i, api_type, stereo);
}
{
// The results of the last texenv stage are put onto the screen,
// regardless of the used destination register
TevStageCombiner::ColorCombiner last_cc;
TevStageCombiner::AlphaCombiner last_ac;
last_cc.hex = uid_data->stagehash[uid_data->genMode_numtevstages].cc;
last_ac.hex = uid_data->stagehash[uid_data->genMode_numtevstages].ac;
if (last_cc.dest != TevOutput::Prev)
{
out.Write("\tprev.rgb = {};\n", tev_c_output_table[u32(last_cc.dest.Value())]);
}
if (last_ac.dest != TevOutput::Prev)
{
out.Write("\tprev.a = {};\n", tev_a_output_table[u32(last_ac.dest.Value())]);
}
}
out.Write("\tprev = prev & 255;\n");
// NOTE: Fragment may not be discarded if alpha test always fails and early depth test is enabled
// (in this case we need to write a depth value if depth test passes regardless of the alpha
// testing result)
if (uid_data->Pretest == AlphaTestResult::Undetermined ||
(uid_data->Pretest == AlphaTestResult::Fail && uid_data->late_ztest))
{
WriteAlphaTest(out, uid_data, api_type, uid_data->per_pixel_depth,
use_dual_source || use_shader_blend);
}
if (uid_data->zfreeze)
{
out.SetConstantsUsed(C_ZSLOPE, C_ZSLOPE);
out.SetConstantsUsed(C_EFBSCALE, C_EFBSCALE);
out.Write("\tfloat2 screenpos = rawpos.xy * " I_EFBSCALE ".xy;\n");
// Opengl has reversed vertical screenspace coordinates
if (api_type == APIType::OpenGL)
out.Write("\tscreenpos.y = {}.0 - screenpos.y;\n", EFB_HEIGHT);
out.Write("\tint zCoord = int(" I_ZSLOPE ".z + " I_ZSLOPE ".x * screenpos.x + " I_ZSLOPE
".y * screenpos.y);\n");
}
else if (!host_config.fast_depth_calc)
{
// 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.
// 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);
// the screen space depth value = far z + (clip z / clip w) * z range
out.Write("\tint zCoord = " I_ZBIAS "[1].x + int((clipPos.z / clipPos.w) * float(" I_ZBIAS
"[1].y));\n");
}
else
{
if (!host_config.backend_reversed_depth_range)
out.Write("\tint zCoord = int((1.0 - rawpos.z) * 16777216.0);\n");
else
out.Write("\tint zCoord = int(rawpos.z * 16777216.0);\n");
}
out.Write("\tzCoord = clamp(zCoord, 0, 0xFFFFFF);\n");
// depth texture can safely be ignored if the result won't be written to the depth buffer
// (early_ztest) and isn't used for fog either
const bool skip_ztexture = !uid_data->per_pixel_depth && uid_data->fog_fsel == FogType::Off;
// Note: z-textures are not written to depth buffer if early depth test is used
if (uid_data->per_pixel_depth && uid_data->early_ztest)
{
if (!host_config.backend_reversed_depth_range)
out.Write("\tdepth = 1.0 - float(zCoord) / 16777216.0;\n");
else
out.Write("\tdepth = float(zCoord) / 16777216.0;\n");
}
// Note: depth texture output is only written to depth buffer if late depth test is used
// theoretical final depth value is used for fog calculation, though, so we have to emulate
// ztextures anyway
if (uid_data->ztex_op != ZTexOp::Disabled && !skip_ztexture)
{
// use the texture input of the last texture stage (textemp), hopefully this has been read and
// is in correct format...
out.SetConstantsUsed(C_ZBIAS, C_ZBIAS + 1);
out.Write("\tzCoord = idot(" I_ZBIAS "[0].xyzw, textemp.xyzw) + " I_ZBIAS "[1].w {};\n",
(uid_data->ztex_op == ZTexOp::Add) ? "+ zCoord" : "");
out.Write("\tzCoord = zCoord & 0xFFFFFF;\n");
}
if (uid_data->per_pixel_depth && uid_data->late_ztest)
{
if (!host_config.backend_reversed_depth_range)
out.Write("\tdepth = 1.0 - float(zCoord) / 16777216.0;\n");
else
out.Write("\tdepth = float(zCoord) / 16777216.0;\n");
}
// No dithering for RGB8 mode
if (uid_data->dither)
{
// Flipper uses a standard 2x2 Bayer Matrix for 6 bit dithering
// Here the matrix is encoded into the two factor constants
out.Write("\tint2 dither = int2(rawpos.xy) & 1;\n");
out.Write("\tprev.rgb = (prev.rgb - (prev.rgb >> 6)) + abs(dither.y * 3 - dither.x * 2);\n");
}
WriteFog(out, uid_data);
// Write the color and alpha values to the framebuffer
// If using shader blend, we still use the separate alpha
WriteColor(out, api_type, uid_data, use_dual_source || use_shader_blend);
if (use_shader_blend)
WriteBlend(out, uid_data);
if (uid_data->bounding_box)
out.Write("\tUpdateBoundingBox(rawpos.xy);\n");
out.Write("}}\n");
return out;
}
static void WriteStage(ShaderCode& out, const pixel_shader_uid_data* uid_data, int n,
APIType api_type, bool stereo)
{
const auto& stage = uid_data->stagehash[n];
out.Write("\n\t// TEV stage {}\n", n);
// HACK to handle cases where the tex gen is not enabled
u32 texcoord = stage.tevorders_texcoord;
const bool has_tex_coord = texcoord < uid_data->genMode_numtexgens;
if (!has_tex_coord)
texcoord = 0;
if (stage.hasindstage)
{
TevStageIndirect tevind;
tevind.hex = stage.tevind;
out.Write("\t// indirect op\n");
// Perform the indirect op on the incoming regular coordinates
// using iindtex{} as the offset coords
if (tevind.bs != IndTexBumpAlpha::Off)
{
static constexpr std::array<const char*, 4> tev_ind_alpha_sel{
"",
"x",
"y",
"z",
};
// 0b11111000, 0b11100000, 0b11110000, 0b11111000
static constexpr std::array<const char*, 4> tev_ind_alpha_mask{
"248",
"224",
"240",
"248",
};
out.Write("alphabump = iindtex{}.{} & {};\n", tevind.bt.Value(),
tev_ind_alpha_sel[u32(tevind.bs.Value())],
tev_ind_alpha_mask[u32(tevind.fmt.Value())]);
}
else
{
// TODO: Should we reset alphabump to 0 here?
}
if (tevind.mid != 0)
{
// format
static constexpr std::array<const char*, 4> tev_ind_fmt_mask{
"255",
"31",
"15",