243 Source/Core/VideoCommon/GeometryShaderGen.cpp
View file
@@ -13,9 +13,18 @@
#include "VideoCommon/VideoConfig.h"
#include "VideoCommon/XFMemory.h"

constexpr std::array<const char*, 4> primitives_ogl = {
{"points", "lines", "triangles", "triangles"}};
constexpr std::array<const char*, 4> primitives_d3d = {{"point", "line", "triangle", "triangle"}};
constexpr std::array<const char*, 4> primitives_ogl{
"points",
"lines",
"triangles",
"triangles",
};
constexpr std::array<const char*, 4> primitives_d3d{
"point",
"line",
"triangle",
"triangle",
};

bool geometry_shader_uid_data::IsPassthrough() const
{
@@ -51,10 +60,10 @@ ShaderCode GenerateGeometryShaderCode(APIType ApiType, const ShaderHostConfig& h
const bool msaa = host_config.msaa;
const bool ssaa = host_config.ssaa;
const bool stereo = host_config.stereo;
const PrimitiveType primitive_type = static_cast<PrimitiveType>(uid_data->primitive_type);
const unsigned primitive_type_index = static_cast<unsigned>(uid_data->primitive_type);
const unsigned vertex_in = std::min(static_cast<unsigned>(primitive_type_index) + 1, 3u);
unsigned vertex_out = primitive_type == PrimitiveType::TriangleStrip ? 3 : 4;
const auto primitive_type = static_cast<PrimitiveType>(uid_data->primitive_type);
const auto primitive_type_index = static_cast<unsigned>(uid_data->primitive_type);
const auto vertex_in = std::min(static_cast<unsigned>(primitive_type_index) + 1, 3u);
u32 vertex_out = primitive_type == PrimitiveType::TriangleStrip ? 3 : 4;

if (wireframe)
vertex_out++;
@@ -64,173 +73,175 @@ ShaderCode GenerateGeometryShaderCode(APIType ApiType, const ShaderHostConfig& h
// Insert layout parameters
if (host_config.backend_gs_instancing)
{
out.Write("layout(%s, invocations = %d) in;\n", primitives_ogl[primitive_type_index],
stereo ? 2 : 1);
out.Write("layout(%s_strip, max_vertices = %d) out;\n", wireframe ? "line" : "triangle",
vertex_out);
out.WriteFmt("layout({}, invocations = {}) in;\n", primitives_ogl[primitive_type_index],
stereo ? 2 : 1);
out.WriteFmt("layout({}_strip, max_vertices = {}) out;\n", wireframe ? "line" : "triangle",
vertex_out);
}
else
{
out.Write("layout(%s) in;\n", primitives_ogl[primitive_type_index]);
out.Write("layout(%s_strip, max_vertices = %d) out;\n", wireframe ? "line" : "triangle",
stereo ? vertex_out * 2 : vertex_out);
out.WriteFmt("layout({}) in;\n", primitives_ogl[primitive_type_index]);
out.WriteFmt("layout({}_strip, max_vertices = {}) out;\n", wireframe ? "line" : "triangle",
stereo ? vertex_out * 2 : vertex_out);
}
}

out.Write("%s", s_lighting_struct);
out.WriteFmt("{}", s_lighting_struct);

// uniforms
if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
out.Write("UBO_BINDING(std140, 3) uniform GSBlock {\n");
out.WriteFmt("UBO_BINDING(std140, 3) uniform GSBlock {{\n");
else
out.Write("cbuffer GSBlock {\n");
out.WriteFmt("cbuffer GSBlock {{\n");

out.Write("\tfloat4 " I_STEREOPARAMS ";\n"
"\tfloat4 " I_LINEPTPARAMS ";\n"
"\tint4 " I_TEXOFFSET ";\n"
"};\n");
out.WriteFmt("\tfloat4 " I_STEREOPARAMS ";\n"
"\tfloat4 " I_LINEPTPARAMS ";\n"
"\tint4 " I_TEXOFFSET ";\n"
"}};\n");

out.Write("struct VS_OUTPUT {\n");
out.WriteFmt("struct VS_OUTPUT {{\n");
GenerateVSOutputMembers(out, ApiType, uid_data->numTexGens, host_config, "");
out.Write("};\n");
out.WriteFmt("}};\n");

if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
{
if (host_config.backend_gs_instancing)
out.Write("#define InstanceID gl_InvocationID\n");
out.WriteFmt("#define InstanceID gl_InvocationID\n");

out.Write("VARYING_LOCATION(0) in VertexData {\n");
out.WriteFmt("VARYING_LOCATION(0) in VertexData {{\n");
GenerateVSOutputMembers(out, ApiType, uid_data->numTexGens, host_config,
GetInterpolationQualifier(msaa, ssaa, true, true));
out.Write("} vs[%d];\n", vertex_in);
out.WriteFmt("}} vs[{}];\n", vertex_in);

out.Write("VARYING_LOCATION(0) out VertexData {\n");
out.WriteFmt("VARYING_LOCATION(0) out VertexData {{\n");
GenerateVSOutputMembers(out, ApiType, uid_data->numTexGens, host_config,
GetInterpolationQualifier(msaa, ssaa, true, false));

if (stereo)
out.Write("\tflat int layer;\n");
out.WriteFmt("\tflat int layer;\n");

out.Write("} ps;\n");
out.WriteFmt("}} ps;\n");

out.Write("void main()\n{\n");
out.WriteFmt("void main()\n{{\n");
}
else // D3D
{
out.Write("struct VertexData {\n");
out.Write("\tVS_OUTPUT o;\n");
out.WriteFmt("struct VertexData {{\n");
out.WriteFmt("\tVS_OUTPUT o;\n");

if (stereo)
out.Write("\tuint layer : SV_RenderTargetArrayIndex;\n");
out.WriteFmt("\tuint layer : SV_RenderTargetArrayIndex;\n");

out.Write("};\n");
out.WriteFmt("}};\n");

if (host_config.backend_gs_instancing)
{
out.Write("[maxvertexcount(%d)]\n[instance(%d)]\n", vertex_out, stereo ? 2 : 1);
out.Write("void main(%s VS_OUTPUT o[%d], inout %sStream<VertexData> output, in uint "
"InstanceID : SV_GSInstanceID)\n{\n",
primitives_d3d[primitive_type_index], vertex_in, wireframe ? "Line" : "Triangle");
out.WriteFmt("[maxvertexcount({})]\n[instance({})]\n", vertex_out, stereo ? 2 : 1);
out.WriteFmt("void main({} VS_OUTPUT o[{}], inout {}Stream<VertexData> output, in uint "
"InstanceID : SV_GSInstanceID)\n{{\n",
primitives_d3d[primitive_type_index], vertex_in,
wireframe ? "Line" : "Triangle");
}
else
{
out.Write("[maxvertexcount(%d)]\n", stereo ? vertex_out * 2 : vertex_out);
out.Write("void main(%s VS_OUTPUT o[%d], inout %sStream<VertexData> output)\n{\n",
primitives_d3d[primitive_type_index], vertex_in, wireframe ? "Line" : "Triangle");
out.WriteFmt("[maxvertexcount({})]\n", stereo ? vertex_out * 2 : vertex_out);
out.WriteFmt("void main({} VS_OUTPUT o[{}], inout {}Stream<VertexData> output)\n{{\n",
primitives_d3d[primitive_type_index], vertex_in,
wireframe ? "Line" : "Triangle");
}

out.Write("\tVertexData ps;\n");
out.WriteFmt("\tVertexData ps;\n");
}

if (primitive_type == PrimitiveType::Lines)
{
if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
{
out.Write("\tVS_OUTPUT start, end;\n");
out.WriteFmt("\tVS_OUTPUT start, end;\n");
AssignVSOutputMembers(out, "start", "vs[0]", uid_data->numTexGens, host_config);
AssignVSOutputMembers(out, "end", "vs[1]", uid_data->numTexGens, host_config);
}
else
{
out.Write("\tVS_OUTPUT start = o[0];\n");
out.Write("\tVS_OUTPUT end = o[1];\n");
out.WriteFmt("\tVS_OUTPUT start = o[0];\n"
"\tVS_OUTPUT end = o[1];\n");
}

// GameCube/Wii's line drawing algorithm is a little quirky. It does not
// use the correct line caps. Instead, the line caps are vertical or
// horizontal depending the slope of the line.
out.Write("\tfloat2 offset;\n"
"\tfloat2 to = abs(end.pos.xy / end.pos.w - start.pos.xy / start.pos.w);\n"
// FIXME: What does real hardware do when line is at a 45-degree angle?
// FIXME: Lines aren't drawn at the correct width. See Twilight Princess map.
"\tif (" I_LINEPTPARAMS ".y * to.y > " I_LINEPTPARAMS ".x * to.x) {\n"
// Line is more tall. Extend geometry left and right.
// Lerp LineWidth/2 from [0..VpWidth] to [-1..1]
"\t\toffset = float2(" I_LINEPTPARAMS ".z / " I_LINEPTPARAMS ".x, 0);\n"
"\t} else {\n"
// Line is more wide. Extend geometry up and down.
// Lerp LineWidth/2 from [0..VpHeight] to [1..-1]
"\t\toffset = float2(0, -" I_LINEPTPARAMS ".z / " I_LINEPTPARAMS ".y);\n"
"\t}\n");
out.WriteFmt("\tfloat2 offset;\n"
"\tfloat2 to = abs(end.pos.xy / end.pos.w - start.pos.xy / start.pos.w);\n"
// FIXME: What does real hardware do when line is at a 45-degree angle?
// FIXME: Lines aren't drawn at the correct width. See Twilight Princess map.
"\tif (" I_LINEPTPARAMS ".y * to.y > " I_LINEPTPARAMS ".x * to.x) {{\n"
// Line is more tall. Extend geometry left and right.
// Lerp LineWidth/2 from [0..VpWidth] to [-1..1]
"\t\toffset = float2(" I_LINEPTPARAMS ".z / " I_LINEPTPARAMS ".x, 0);\n"
"\t}} else {{\n"
// Line is more wide. Extend geometry up and down.
// Lerp LineWidth/2 from [0..VpHeight] to [1..-1]
"\t\toffset = float2(0, -" I_LINEPTPARAMS ".z / " I_LINEPTPARAMS ".y);\n"
"\t}}\n");
}
else if (primitive_type == PrimitiveType::Points)
{
if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
{
out.Write("\tVS_OUTPUT center;\n");
out.WriteFmt("\tVS_OUTPUT center;\n");
AssignVSOutputMembers(out, "center", "vs[0]", uid_data->numTexGens, host_config);
}
else
{
out.Write("\tVS_OUTPUT center = o[0];\n");
out.WriteFmt("\tVS_OUTPUT center = o[0];\n");
}

// Offset from center to upper right vertex
// Lerp PointSize/2 from [0,0..VpWidth,VpHeight] to [-1,1..1,-1]
out.Write("\tfloat2 offset = float2(" I_LINEPTPARAMS ".w / " I_LINEPTPARAMS
".x, -" I_LINEPTPARAMS ".w / " I_LINEPTPARAMS ".y) * center.pos.w;\n");
out.WriteFmt("\tfloat2 offset = float2(" I_LINEPTPARAMS ".w / " I_LINEPTPARAMS
".x, -" I_LINEPTPARAMS ".w / " I_LINEPTPARAMS ".y) * center.pos.w;\n");
}

if (stereo)
{
// If the GPU supports invocation we don't need a for loop and can simply use the
// invocation identifier to determine which layer we're rendering.
if (host_config.backend_gs_instancing)
out.Write("\tint eye = InstanceID;\n");
out.WriteFmt("\tint eye = InstanceID;\n");
else
out.Write("\tfor (int eye = 0; eye < 2; ++eye) {\n");
out.WriteFmt("\tfor (int eye = 0; eye < 2; ++eye) {{\n");
}

if (wireframe)
out.Write("\tVS_OUTPUT first;\n");
out.WriteFmt("\tVS_OUTPUT first;\n");

out.Write("\tfor (int i = 0; i < %d; ++i) {\n", vertex_in);
out.WriteFmt("\tfor (int i = 0; i < {}; ++i) {{\n", vertex_in);

if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
{
out.Write("\tVS_OUTPUT f;\n");
out.WriteFmt("\tVS_OUTPUT f;\n");
AssignVSOutputMembers(out, "f", "vs[i]", uid_data->numTexGens, host_config);

if (host_config.backend_depth_clamp &&
DriverDetails::HasBug(DriverDetails::BUG_BROKEN_CLIP_DISTANCE))
{
// On certain GPUs we have to consume the clip distance from the vertex shader
// or else the other vertex shader outputs will get corrupted.
out.Write("\tf.clipDist0 = gl_in[i].gl_ClipDistance[0];\n");
out.Write("\tf.clipDist1 = gl_in[i].gl_ClipDistance[1];\n");
out.WriteFmt("\tf.clipDist0 = gl_in[i].gl_ClipDistance[0];\n"
"\tf.clipDist1 = gl_in[i].gl_ClipDistance[1];\n");
}
}
else
{
out.Write("\tVS_OUTPUT f = o[i];\n");
out.WriteFmt("\tVS_OUTPUT f = o[i];\n");
}

if (stereo)
{
// Select the output layer
out.Write("\tps.layer = eye;\n");
out.WriteFmt("\tps.layer = eye;\n");
if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
out.Write("\tgl_Layer = eye;\n");
out.WriteFmt("\tgl_Layer = eye;\n");

// For stereoscopy add a small horizontal offset in Normalized Device Coordinates proportional
// to the depth of the vertex. We retrieve the depth value from the w-component of the projected
@@ -239,56 +250,56 @@ ShaderCode GenerateGeometryShaderCode(APIType ApiType, const ShaderHostConfig& h
// the depth value. This results in objects at a distance smaller than the convergence
// distance to seemingly appear in front of the screen.
// This formula is based on page 13 of the "Nvidia 3D Vision Automatic, Best Practices Guide"
out.Write("\tfloat hoffset = (eye == 0) ? " I_STEREOPARAMS ".x : " I_STEREOPARAMS ".y;\n");
out.Write("\tf.pos.x += hoffset * (f.pos.w - " I_STEREOPARAMS ".z);\n");
out.WriteFmt("\tfloat hoffset = (eye == 0) ? " I_STEREOPARAMS ".x : " I_STEREOPARAMS ".y;\n");
out.WriteFmt("\tf.pos.x += hoffset * (f.pos.w - " I_STEREOPARAMS ".z);\n");
}

if (primitive_type == PrimitiveType::Lines)
{
out.Write("\tVS_OUTPUT l = f;\n"
"\tVS_OUTPUT r = f;\n");
out.WriteFmt("\tVS_OUTPUT l = f;\n"
"\tVS_OUTPUT r = f;\n");

out.Write("\tl.pos.xy -= offset * l.pos.w;\n"
"\tr.pos.xy += offset * r.pos.w;\n");
out.WriteFmt("\tl.pos.xy -= offset * l.pos.w;\n"
"\tr.pos.xy += offset * r.pos.w;\n");

out.Write("\tif (" I_TEXOFFSET "[2] != 0) {\n");
out.Write("\tfloat texOffset = 1.0 / float(" I_TEXOFFSET "[2]);\n");
out.WriteFmt("\tif (" I_TEXOFFSET "[2] != 0) {{\n");
out.WriteFmt("\tfloat texOffset = 1.0 / float(" I_TEXOFFSET "[2]);\n");

for (unsigned int i = 0; i < uid_data->numTexGens; ++i)
for (u32 i = 0; i < uid_data->numTexGens; ++i)
{
out.Write("\tif (((" I_TEXOFFSET "[0] >> %d) & 0x1) != 0)\n", i);
out.Write("\t\tr.tex%d.x += texOffset;\n", i);
out.WriteFmt("\tif (((" I_TEXOFFSET "[0] >> {}) & 0x1) != 0)\n", i);
out.WriteFmt("\t\tr.tex{}.x += texOffset;\n", i);
}
out.Write("\t}\n");
out.WriteFmt("\t}}\n");

EmitVertex(out, host_config, uid_data, "l", ApiType, wireframe, true);
EmitVertex(out, host_config, uid_data, "r", ApiType, wireframe);
}
else if (primitive_type == PrimitiveType::Points)
{
out.Write("\tVS_OUTPUT ll = f;\n"
"\tVS_OUTPUT lr = f;\n"
"\tVS_OUTPUT ul = f;\n"
"\tVS_OUTPUT ur = f;\n");
out.WriteFmt("\tVS_OUTPUT ll = f;\n"
"\tVS_OUTPUT lr = f;\n"
"\tVS_OUTPUT ul = f;\n"
"\tVS_OUTPUT ur = f;\n");

out.Write("\tll.pos.xy += float2(-1,-1) * offset;\n"
"\tlr.pos.xy += float2(1,-1) * offset;\n"
"\tul.pos.xy += float2(-1,1) * offset;\n"
"\tur.pos.xy += offset;\n");
out.WriteFmt("\tll.pos.xy += float2(-1,-1) * offset;\n"
"\tlr.pos.xy += float2(1,-1) * offset;\n"
"\tul.pos.xy += float2(-1,1) * offset;\n"
"\tur.pos.xy += offset;\n");

out.Write("\tif (" I_TEXOFFSET "[3] != 0) {\n");
out.Write("\tfloat2 texOffset = float2(1.0 / float(" I_TEXOFFSET
"[3]), 1.0 / float(" I_TEXOFFSET "[3]));\n");
out.WriteFmt("\tif (" I_TEXOFFSET "[3] != 0) {{\n");
out.WriteFmt("\tfloat2 texOffset = float2(1.0 / float(" I_TEXOFFSET
"[3]), 1.0 / float(" I_TEXOFFSET "[3]));\n");

for (unsigned int i = 0; i < uid_data->numTexGens; ++i)
for (u32 i = 0; i < uid_data->numTexGens; ++i)
{
out.Write("\tif (((" I_TEXOFFSET "[1] >> %d) & 0x1) != 0) {\n", i);
out.Write("\t\tul.tex%d.xy += float2(0,1) * texOffset;\n", i);
out.Write("\t\tur.tex%d.xy += texOffset;\n", i);
out.Write("\t\tlr.tex%d.xy += float2(1,0) * texOffset;\n", i);
out.Write("\t}\n");
out.WriteFmt("\tif (((" I_TEXOFFSET "[1] >> {}) & 0x1) != 0) {{\n", i);
out.WriteFmt("\t\tul.tex{}.xy += float2(0,1) * texOffset;\n", i);
out.WriteFmt("\t\tur.tex{}.xy += texOffset;\n", i);
out.WriteFmt("\t\tlr.tex{}.xy += float2(1,0) * texOffset;\n", i);
out.WriteFmt("\t}}\n");
}
out.Write("\t}\n");
out.WriteFmt("\t}}\n");

EmitVertex(out, host_config, uid_data, "ll", ApiType, wireframe, true);
EmitVertex(out, host_config, uid_data, "lr", ApiType, wireframe);
@@ -300,14 +311,14 @@ ShaderCode GenerateGeometryShaderCode(APIType ApiType, const ShaderHostConfig& h
EmitVertex(out, host_config, uid_data, "f", ApiType, wireframe, true);
}

out.Write("\t}\n");
out.WriteFmt("\t}}\n");

EndPrimitive(out, host_config, uid_data, ApiType, wireframe);

if (stereo && !host_config.backend_gs_instancing)
out.Write("\t}\n");
out.WriteFmt("\t}}\n");

out.Write("}\n");
out.WriteFmt("}}\n");

return out;
}
@@ -317,34 +328,34 @@ static void EmitVertex(ShaderCode& out, const ShaderHostConfig& host_config,
APIType ApiType, bool wireframe, bool first_vertex)
{
if (wireframe && first_vertex)
out.Write("\tif (i == 0) first = %s;\n", vertex);
out.WriteFmt("\tif (i == 0) first = {};\n", vertex);

if (ApiType == APIType::OpenGL)
{
out.Write("\tgl_Position = %s.pos;\n", vertex);
out.WriteFmt("\tgl_Position = {}.pos;\n", vertex);
if (host_config.backend_depth_clamp)
{
out.Write("\tgl_ClipDistance[0] = %s.clipDist0;\n", vertex);
out.Write("\tgl_ClipDistance[1] = %s.clipDist1;\n", vertex);
out.WriteFmt("\tgl_ClipDistance[0] = {}.clipDist0;\n", vertex);
out.WriteFmt("\tgl_ClipDistance[1] = {}.clipDist1;\n", vertex);
}
AssignVSOutputMembers(out, "ps", vertex, uid_data->numTexGens, host_config);
}
else if (ApiType == APIType::Vulkan)
{
// Vulkan NDC space has Y pointing down (right-handed NDC space).
out.Write("\tgl_Position = %s.pos;\n", vertex);
out.Write("\tgl_Position.y = -gl_Position.y;\n");
out.WriteFmt("\tgl_Position = {}.pos;\n", vertex);
out.WriteFmt("\tgl_Position.y = -gl_Position.y;\n");
AssignVSOutputMembers(out, "ps", vertex, uid_data->numTexGens, host_config);
}
else
{
out.Write("\tps.o = %s;\n", vertex);
out.WriteFmt("\tps.o = {};\n", vertex);
}

if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
out.Write("\tEmitVertex();\n");
out.WriteFmt("\tEmitVertex();\n");
else
out.Write("\toutput.Append(ps);\n");
out.WriteFmt("\toutput.Append(ps);\n");
}

static void EndPrimitive(ShaderCode& out, const ShaderHostConfig& host_config,
@@ -354,9 +365,9 @@ static void EndPrimitive(ShaderCode& out, const ShaderHostConfig& host_config,
EmitVertex(out, host_config, uid_data, "first", ApiType, wireframe);

if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
out.Write("\tEndPrimitive();\n");
out.WriteFmt("\tEndPrimitive();\n");
else
out.Write("\toutput.RestartStrip();\n");
out.WriteFmt("\toutput.RestartStrip();\n");
}

void EnumerateGeometryShaderUids(const std::function<void(const GeometryShaderUid&)>& callback)