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dolphin/Source/Core/VideoCommon/UberShaderVertex.cpp
Pokechu22 784079853d VideoCommon: Add comment explaining why only the first normal gets normalized 
Co-authored-by: Scott Mansell <phiren@gmail.com>
2022-04-22 16:54:38 -07:00

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// Copyright 2015 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "VideoCommon/UberShaderVertex.h"
#include "VideoCommon/DriverDetails.h"
#include "VideoCommon/NativeVertexFormat.h"
#include "VideoCommon/UberShaderCommon.h"
#include "VideoCommon/VertexShaderGen.h"
#include "VideoCommon/VideoCommon.h"
#include "VideoCommon/XFMemory.h"
namespace UberShader
{
VertexShaderUid GetVertexShaderUid()
{
VertexShaderUid out;
vertex_ubershader_uid_data* const uid_data = out.GetUidData();
uid_data->num_texgens = xfmem.numTexGen.numTexGens;
return out;
}
static void GenVertexShaderTexGens(APIType api_type, u32 num_texgen, ShaderCode& out);
ShaderCode GenVertexShader(APIType api_type, const ShaderHostConfig& host_config,
const vertex_ubershader_uid_data* uid_data)
{
const bool msaa = host_config.msaa;
const bool ssaa = host_config.ssaa;
const bool per_pixel_lighting = host_config.per_pixel_lighting;
const bool vertex_rounding = host_config.vertex_rounding;
const u32 num_texgen = uid_data->num_texgens;
ShaderCode out;
out.Write("// Vertex UberShader\n\n");
out.Write("{}", s_lighting_struct);
// uniforms
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
out.Write("UBO_BINDING(std140, 2) uniform VSBlock {{\n");
else
out.Write("cbuffer VSBlock {{\n");
out.Write("{}", s_shader_uniforms);
out.Write("}};\n");
out.Write("struct VS_OUTPUT {{\n");
GenerateVSOutputMembers(out, api_type, num_texgen, host_config, "");
out.Write("}};\n\n");
WriteIsNanHeader(out, api_type);
WriteBitfieldExtractHeader(out, api_type, host_config);
WriteLightingFunction(out);
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
{
out.Write("ATTRIBUTE_LOCATION({}) in float4 rawpos;\n", SHADER_POSITION_ATTRIB);
out.Write("ATTRIBUTE_LOCATION({}) in uint4 posmtx;\n", SHADER_POSMTX_ATTRIB);
out.Write("ATTRIBUTE_LOCATION({}) in float3 rawnormal;\n", SHADER_NORMAL_ATTRIB);
out.Write("ATTRIBUTE_LOCATION({}) in float3 rawtangent;\n", SHADER_TANGENT_ATTRIB);
out.Write("ATTRIBUTE_LOCATION({}) in float3 rawbinormal;\n", SHADER_BINORMAL_ATTRIB);
out.Write("ATTRIBUTE_LOCATION({}) in float4 rawcolor0;\n", SHADER_COLOR0_ATTRIB);
out.Write("ATTRIBUTE_LOCATION({}) in float4 rawcolor1;\n", SHADER_COLOR1_ATTRIB);
for (int i = 0; i < 8; ++i)
out.Write("ATTRIBUTE_LOCATION({}) in float3 rawtex{};\n", SHADER_TEXTURE0_ATTRIB + i, i);
if (host_config.backend_geometry_shaders)
{
out.Write("VARYING_LOCATION(0) out VertexData {{\n");
GenerateVSOutputMembers(out, api_type, num_texgen, host_config,
GetInterpolationQualifier(msaa, ssaa, true, false));
out.Write("}} vs;\n");
}
else
{
// Let's set up attributes
u32 counter = 0;
out.Write("VARYING_LOCATION({}) {} out float4 colors_0;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
out.Write("VARYING_LOCATION({}) {} out float4 colors_1;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
for (u32 i = 0; i < num_texgen; ++i)
{
out.Write("VARYING_LOCATION({}) {} out float3 tex{};\n", counter++,
GetInterpolationQualifier(msaa, ssaa), i);
}
if (!host_config.fast_depth_calc)
{
out.Write("VARYING_LOCATION({}) {} out float4 clipPos;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
}
if (per_pixel_lighting)
{
out.Write("VARYING_LOCATION({}) {} out float3 Normal;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
out.Write("VARYING_LOCATION({}) {} out float3 WorldPos;\n", counter++,
GetInterpolationQualifier(msaa, ssaa));
}
}
out.Write("void main()\n{{\n");
}
else // D3D
{
out.Write("VS_OUTPUT main(\n");
// inputs
out.Write(" float3 rawnormal : NORMAL,\n"
" float3 rawtangent : TANGENT,\n"
" float3 rawbinormal : BINORMAL,\n"
" float4 rawcolor0 : COLOR0,\n"
" float4 rawcolor1 : COLOR1,\n");
for (int i = 0; i < 8; ++i)
out.Write(" float3 rawtex{} : TEXCOORD{},\n", i, i);
out.Write(" uint posmtx : BLENDINDICES,\n");
out.Write(" float4 rawpos : POSITION) {{\n");
}
out.Write("VS_OUTPUT o;\n"
"\n");
// Transforms
out.Write("// Position matrix\n"
"float4 P0;\n"
"float4 P1;\n"
"float4 P2;\n"
"\n"
"// Normal matrix\n"
"float3 N0;\n"
"float3 N1;\n"
"float3 N2;\n"
"\n"
"if ((components & {}u) != 0u) {{ // VB_HAS_POSMTXIDX\n",
VB_HAS_POSMTXIDX);
out.Write(" // Vertex format has a per-vertex matrix\n"
" int posidx = int(posmtx.r);\n"
" P0 = " I_TRANSFORMMATRICES "[posidx];\n"
" P1 = " I_TRANSFORMMATRICES "[posidx+1];\n"
" P2 = " I_TRANSFORMMATRICES "[posidx+2];\n"
"\n"
" int normidx = posidx >= 32 ? (posidx - 32) : posidx;\n"
" N0 = " I_NORMALMATRICES "[normidx].xyz;\n"
" N1 = " I_NORMALMATRICES "[normidx+1].xyz;\n"
" N2 = " I_NORMALMATRICES "[normidx+2].xyz;\n"
"}} else {{\n"
" // One shared matrix\n"
" P0 = " I_POSNORMALMATRIX "[0];\n"
" P1 = " I_POSNORMALMATRIX "[1];\n"
" P2 = " I_POSNORMALMATRIX "[2];\n"
" N0 = " I_POSNORMALMATRIX "[3].xyz;\n"
" N1 = " I_POSNORMALMATRIX "[4].xyz;\n"
" N2 = " I_POSNORMALMATRIX "[5].xyz;\n"
"}}\n"
"\n"
"// Multiply the position vector by the position matrix\n"
"float4 pos = float4(dot(P0, rawpos), dot(P1, rawpos), dot(P2, rawpos), 1.0);\n"
"o.pos = float4(dot(" I_PROJECTION "[0], pos), dot(" I_PROJECTION
"[1], pos), dot(" I_PROJECTION "[2], pos), dot(" I_PROJECTION "[3], pos));\n"
"\n"
"// The scale of the transform matrix is used to control the size of the emboss map\n"
"// effect by changing the scale of the transformed binormals (which only get used by\n"
"// emboss map texgens). By normalising the first transformed normal (which is used\n"
"// by lighting calculations and needs to be unit length), the same transform matrix\n"
"// can do double duty, scaling for emboss mapping, and not scaling for lighting.\n"
"float3 _normal = float3(0.0, 0.0, 0.0);\n"
"if ((components & {}u) != 0u) // VB_HAS_NORMAL\n",
VB_HAS_NORMAL);
out.Write(" _normal = normalize(float3(dot(N0, rawnormal), dot(N1, rawnormal), dot(N2, "
"rawnormal)));\n"
"\n"
"float3 _tangent = float3(0.0, 0.0, 0.0);\n"
"if ((components & {}u) != 0u) // VB_HAS_TANGENT\n",
VB_HAS_TANGENT);
out.Write(" _tangent = float3(dot(N0, rawtangent), dot(N1, rawtangent), dot(N2, rawtangent));\n"
"else\n"
" _tangent = float3(dot(N0, " I_CACHED_TANGENT ".xyz), dot(N1, " I_CACHED_TANGENT
".xyz), dot(N2, " I_CACHED_TANGENT ".xyz));\n"
"\n"
"float3 _binormal = float3(0.0, 0.0, 0.0);\n"
"if ((components & {}u) != 0u) // VB_HAS_BINORMAL\n",
VB_HAS_BINORMAL);
out.Write(" _binormal = float3(dot(N0, rawbinormal), dot(N1, rawbinormal), dot(N2, "
"rawbinormal));\n"
"else\n"
" _binormal = float3(dot(N0, " I_CACHED_BINORMAL ".xyz), dot(N1, " I_CACHED_BINORMAL
".xyz), dot(N2, " I_CACHED_BINORMAL ".xyz));\n"
"\n");
// Hardware Lighting
out.Write("// xfmem.numColorChans controls the number of color channels available to TEV,\n"
"// but we still need to generate all channels here, as it can be used in texgen.\n"
"// Cel-damage is an example of this.\n"
"float4 vertex_color_0, vertex_color_1;\n"
"\n");
out.Write("// To use color 1, the vertex descriptor must have color 0 and 1.\n"
"// If color 1 is present but not color 0, it is used for lighting channel 0.\n"
"bool use_color_1 = ((components & {0}u) == {0}u); // VB_HAS_COL0 | VB_HAS_COL1\n",
VB_HAS_COL0 | VB_HAS_COL1);
out.Write("for (uint color = 0u; color < {}u; color++) {{\n", NUM_XF_COLOR_CHANNELS);
out.Write(" if ((color == 0u || use_color_1) && (components & ({}u << color)) != 0u) {{\n",
VB_HAS_COL0);
out.Write(" // Use color0 for channel 0, and color1 for channel 1 if both colors 0 and 1 are "
"present.\n"
" if (color == 0u)\n"
" vertex_color_0 = rawcolor0;\n"
" else\n"
" vertex_color_1 = rawcolor1;\n"
" }} else if (color == 0u && (components & {}u) != 0u) {{\n",
VB_HAS_COL1);
out.Write(" // Use color1 for channel 0 if color0 is not present.\n"
" vertex_color_0 = rawcolor1;\n"
" }} else {{\n"
" if (color == 0u)\n"
" vertex_color_0 = missing_color_value;\n"
" else\n"
" vertex_color_1 = missing_color_value;\n"
" }}\n"
"}}\n"
"\n");
WriteVertexLighting(out, api_type, "pos.xyz", "_normal", "vertex_color_0", "vertex_color_1",
"o.colors_0", "o.colors_1");
// Texture Coordinates
if (num_texgen > 0)
GenVertexShaderTexGens(api_type, num_texgen, out);
if (per_pixel_lighting)
{
out.Write("// When per-pixel lighting is enabled, the vertex colors are passed through\n"
"// unmodified so we can evaluate the lighting in the pixel shader.\n"
"// Lighting is also still computed in the vertex shader since it can be used to\n"
"// generate texture coordinates. We generated them above, so now the colors can\n"
"// be reverted to their previous stage.\n"
"o.colors_0 = vertex_color_0;\n"
"o.colors_1 = vertex_color_1;\n"
"// Note that the numColorChans logic should be (but currently isn't)\n"
"// performed in the pixel shader.\n");
}
else
{
out.Write("// The number of colors available to TEV is determined by numColorChans.\n"
"// We have to provide the fields to match the interface, so set to zero\n"
"// if it's not enabled.\n"
"if (xfmem_numColorChans == 0u)\n"
" o.colors_0 = float4(0.0, 0.0, 0.0, 0.0);\n"
"if (xfmem_numColorChans <= 1u)\n"
" o.colors_1 = float4(0.0, 0.0, 0.0, 0.0);\n");
}
if (!host_config.fast_depth_calc)
{
// clipPos/w needs to be done in pixel shader, not here
out.Write("o.clipPos = o.pos;\n");
}
if (per_pixel_lighting)
{
out.Write("o.Normal = _normal;\n"
"o.WorldPos = pos.xyz;\n");
}
// If we can disable the incorrect depth clipping planes using depth clamping, then we can do
// our own depth clipping and calculate the depth range before the perspective divide if
// necessary.
if (host_config.backend_depth_clamp)
{
// Since we're adjusting z for the depth range before the perspective divide, we have to do our
// own clipping. We want to clip so that -w <= z <= 0, which matches the console -1..0 range.
// We adjust our depth value for clipping purposes to match the perspective projection in the
// software backend, which is a hack to fix Sonic Adventure and Unleashed games.
out.Write("float clipDepth = o.pos.z * (1.0 - 1e-7);\n"
"float clipDist0 = clipDepth + o.pos.w;\n" // Near: z < -w
"float clipDist1 = -clipDepth;\n"); // Far: z > 0
if (host_config.backend_geometry_shaders)
{
out.Write("o.clipDist0 = clipDist0;\n"
"o.clipDist1 = clipDist1;\n");
}
}
// Write the true depth value. If the game uses depth textures, then the pixel shader will
// override it with the correct values if not then early z culling will improve speed.
// There are two different ways to do this, when the depth range is oversized, we process
// the depth range in the vertex shader, if not we let the host driver handle it.
//
// Adjust z for the depth range. We're using an equation which incorperates a depth inversion,
// so we can map the console -1..0 range to the 0..1 range used in the depth buffer.
// We have to handle the depth range in the vertex shader instead of after the perspective
// divide, because some games will use a depth range larger than what is allowed by the
// graphics API. These large depth ranges will still be clipped to the 0..1 range, so these
// games effectively add a depth bias to the values written to the depth buffer.
out.Write("o.pos.z = o.pos.w * " I_PIXELCENTERCORRECTION ".w - "
"o.pos.z * " I_PIXELCENTERCORRECTION ".z;\n");
if (!host_config.backend_clip_control)
{
// If the graphics API doesn't support a depth range of 0..1, then we need to map z to
// the -1..1 range. Unfortunately we have to use a substraction, which is a lossy floating-point
// operation that can introduce a round-trip error.
out.Write("o.pos.z = o.pos.z * 2.0 - o.pos.w;\n");
}
// Correct for negative viewports by mirroring all vertices. We need to negate the height here,
// since the viewport height is already negated by the render backend.
out.Write("o.pos.xy *= sign(" I_PIXELCENTERCORRECTION ".xy * float2(1.0, -1.0));\n");
// The console GPU places the pixel center at 7/12 in screen space unless
// antialiasing is enabled, while D3D and OpenGL place it at 0.5. This results
// in some primitives being placed one pixel too far to the bottom-right,
// which in turn can be critical if it happens for clear quads.
// Hence, we compensate for this pixel center difference so that primitives
// get rasterized correctly.
out.Write("o.pos.xy = o.pos.xy - o.pos.w * " I_PIXELCENTERCORRECTION ".xy;\n");
if (vertex_rounding)
{
// By now our position is in clip space. However, higher resolutions than the Wii outputs
// cause an additional pixel offset. Due to a higher pixel density we need to correct this
// by converting our clip-space position into the Wii's screen-space.
// Acquire the right pixel and then convert it back.
out.Write("if (o.pos.w == 1.0f)\n"
"{{\n");
out.Write("\tfloat ss_pixel_x = ((o.pos.x + 1.0f) * (" I_VIEWPORT_SIZE ".x * 0.5f));\n"
"\tfloat ss_pixel_y = ((o.pos.y + 1.0f) * (" I_VIEWPORT_SIZE ".y * 0.5f));\n");
out.Write("\tss_pixel_x = round(ss_pixel_x);\n"
"\tss_pixel_y = round(ss_pixel_y);\n");
out.Write("\to.pos.x = ((ss_pixel_x / (" I_VIEWPORT_SIZE ".x * 0.5f)) - 1.0f);\n"
"\to.pos.y = ((ss_pixel_y / (" I_VIEWPORT_SIZE ".y * 0.5f)) - 1.0f);\n"
"}}\n");
}
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
{
if (host_config.backend_geometry_shaders)
{
AssignVSOutputMembers(out, "vs", "o", num_texgen, host_config);
}
else
{
// TODO: Pass interface blocks between shader stages even if geometry shaders
// are not supported, however that will require at least OpenGL 3.2 support.
for (u32 i = 0; i < num_texgen; ++i)
out.Write("tex{}.xyz = o.tex{};\n", i, i);
if (!host_config.fast_depth_calc)
out.Write("clipPos = o.clipPos;\n");
if (per_pixel_lighting)
{
out.Write("Normal = o.Normal;\n"
"WorldPos = o.WorldPos;\n");
}
out.Write("colors_0 = o.colors_0;\n"
"colors_1 = o.colors_1;\n");
}
if (host_config.backend_depth_clamp)
{
out.Write("gl_ClipDistance[0] = clipDist0;\n"
"gl_ClipDistance[1] = clipDist1;\n");
}
// Vulkan NDC space has Y pointing down (right-handed NDC space).
if (api_type == APIType::Vulkan)
out.Write("gl_Position = float4(o.pos.x, -o.pos.y, o.pos.z, o.pos.w);\n");
else
out.Write("gl_Position = o.pos;\n");
}
else // D3D
{
out.Write("return o;\n");
}
out.Write("}}\n");
return out;
}
static void GenVertexShaderTexGens(APIType api_type, u32 num_texgen, ShaderCode& out)
{
// The HLSL compiler complains that the output texture coordinates are uninitialized when trying
// to dynamically index them.
for (u32 i = 0; i < num_texgen; i++)
out.Write("o.tex{} = float3(0.0, 0.0, 0.0);\n", i);
out.Write("// Texture coordinate generation\n");
if (num_texgen == 1)
{
out.Write("{{ const uint texgen = 0u;\n");
}
else
{
out.Write("{}for (uint texgen = 0u; texgen < {}u; texgen++) {{\n",
api_type == APIType::D3D ? "[loop] " : "", num_texgen);
}
out.Write(" // Texcoord transforms\n");
out.Write(" float4 coord = float4(0.0, 0.0, 1.0, 1.0);\n"
" uint texMtxInfo = xfmem_texMtxInfo(texgen);\n");
out.Write(" switch ({}) {{\n", BitfieldExtract<&TexMtxInfo::sourcerow>("texMtxInfo"));
out.Write(" case {:s}:\n", SourceRow::Geom);
out.Write(" coord.xyz = rawpos.xyz;\n");
out.Write(" break;\n\n");
out.Write(" case {:s}:\n", SourceRow::Normal);
out.Write(" coord.xyz = ((components & {}u /* VB_HAS_NORMAL */) != 0u) ? rawnormal.xyz : "
"coord.xyz;",
VB_HAS_NORMAL);
out.Write(" break;\n\n");
out.Write(" case {:s}:\n", SourceRow::BinormalT);
out.Write(" coord.xyz = ((components & {}u /* VB_HAS_TANGENT */) != 0u) ? rawtangent.xyz : "
"coord.xyz;",
VB_HAS_TANGENT);
out.Write(" break;\n\n");
out.Write(" case {:s}:\n", SourceRow::BinormalB);
out.Write(" coord.xyz = ((components & {}u /* VB_HAS_BINORMAL */) != 0u) ? rawbinormal.xyz : "
"coord.xyz;",
VB_HAS_BINORMAL);
out.Write(" break;\n\n");
for (u32 i = 0; i < 8; i++)
{
out.Write(" case {:s}:\n", static_cast<SourceRow>(static_cast<u32>(SourceRow::Tex0) + i));
out.Write(
" coord = ((components & {}u /* VB_HAS_UV{} */) != 0u) ? float4(rawtex{}.x, rawtex{}.y, "
"1.0, 1.0) : coord;\n",
VB_HAS_UV0 << i, i, i, i);
out.Write(" break;\n\n");
}
out.Write(" }}\n"
"\n");
out.Write(" // Input form of AB11 sets z element to 1.0\n");
out.Write(" if ({} == {:s}) // inputform == AB11\n",
BitfieldExtract<&TexMtxInfo::inputform>("texMtxInfo"), TexInputForm::AB11);
out.Write(" coord.z = 1.0f;\n"
"\n");
// Convert NaNs to 1 - needed to fix eyelids in Shadow the Hedgehog during cutscenes
// See https://bugs.dolphin-emu.org/issues/11458
out.Write(" // Convert NaN to 1\n");
out.Write(" if (dolphin_isnan(coord.x)) coord.x = 1.0;\n");
out.Write(" if (dolphin_isnan(coord.y)) coord.y = 1.0;\n");
out.Write(" if (dolphin_isnan(coord.z)) coord.z = 1.0;\n");
out.Write(" // first transformation\n");
out.Write(" uint texgentype = {};\n", BitfieldExtract<&TexMtxInfo::texgentype>("texMtxInfo"));
out.Write(" float3 output_tex;\n"
" switch (texgentype)\n"
" {{\n");
out.Write(" case {:s}:\n", TexGenType::EmbossMap);
out.Write(" {{\n");
out.Write(" uint light = {};\n",
BitfieldExtract<&TexMtxInfo::embosslightshift>("texMtxInfo"));
out.Write(" uint source = {};\n",
BitfieldExtract<&TexMtxInfo::embosssourceshift>("texMtxInfo"));
out.Write(" switch (source) {{\n");
for (u32 i = 0; i < num_texgen; i++)
out.Write(" case {}u: output_tex.xyz = o.tex{}; break;\n", i, i);
out.Write(" default: output_tex.xyz = float3(0.0, 0.0, 0.0); break;\n"
" }}\n"
" float3 ldir = normalize(" I_LIGHTS "[light].pos.xyz - pos.xyz);\n"
" output_tex.xyz += float3(dot(ldir, _tangent), dot(ldir, _binormal), 0.0);\n"
" }}\n"
" break;\n\n");
out.Write(" case {:s}:\n", TexGenType::Color0);
out.Write(" output_tex.xyz = float3(o.colors_0.x, o.colors_0.y, 1.0);\n"
" break;\n\n");
out.Write(" case {:s}:\n", TexGenType::Color1);
out.Write(" output_tex.xyz = float3(o.colors_1.x, o.colors_1.y, 1.0);\n"
" break;\n\n");
out.Write(" case {:s}:\n", TexGenType::Regular);
out.Write(" default:\n"
" {{\n");
out.Write(" if ((components & ({}u /* VB_HAS_TEXMTXIDX0 */ << texgen)) != 0u) {{\n",
VB_HAS_TEXMTXIDX0);
out.Write(" // This is messy, due to dynamic indexing of the input texture coordinates.\n"
" // Hopefully the compiler will unroll this whole loop anyway and the switch.\n"
" int tmp = 0;\n"
" switch (texgen) {{\n");
for (u32 i = 0; i < num_texgen; i++)
out.Write(" case {}u: tmp = int(rawtex{}.z); break;\n", i, i);
out.Write(" }}\n"
"\n");
out.Write(" if ({} == {:s}) {{\n", BitfieldExtract<&TexMtxInfo::projection>("texMtxInfo"),
TexSize::STQ);
out.Write(" output_tex.xyz = float3(dot(coord, " I_TRANSFORMMATRICES "[tmp]),\n"
" dot(coord, " I_TRANSFORMMATRICES "[tmp + 1]),\n"
" dot(coord, " I_TRANSFORMMATRICES "[tmp + 2]));\n"
" }} else {{\n"
" output_tex.xyz = float3(dot(coord, " I_TRANSFORMMATRICES "[tmp]),\n"
" dot(coord, " I_TRANSFORMMATRICES "[tmp + 1]),\n"
" 1.0);\n"
" }}\n"
" }} else {{\n");
out.Write(" if ({} == {:s}) {{\n", BitfieldExtract<&TexMtxInfo::projection>("texMtxInfo"),
TexSize::STQ);
out.Write(" output_tex.xyz = float3(dot(coord, " I_TEXMATRICES "[3u * texgen]),\n"
" dot(coord, " I_TEXMATRICES "[3u * texgen + 1u]),\n"
" dot(coord, " I_TEXMATRICES "[3u * texgen + 2u]));\n"
" }} else {{\n"
" output_tex.xyz = float3(dot(coord, " I_TEXMATRICES "[3u * texgen]),\n"
" dot(coord, " I_TEXMATRICES "[3u * texgen + 1u]),\n"
" 1.0);\n"
" }}\n"
" }}\n"
" }}\n"
" break;\n\n"
" }}\n"
"\n");
out.Write(" if (xfmem_dualTexInfo != 0u) {{\n");
out.Write(" uint postMtxInfo = xfmem_postMtxInfo(texgen);");
out.Write(" uint base_index = {};\n", BitfieldExtract<&PostMtxInfo::index>("postMtxInfo"));
out.Write(" float4 P0 = " I_POSTTRANSFORMMATRICES "[base_index & 0x3fu];\n"
" float4 P1 = " I_POSTTRANSFORMMATRICES "[(base_index + 1u) & 0x3fu];\n"
" float4 P2 = " I_POSTTRANSFORMMATRICES "[(base_index + 2u) & 0x3fu];\n"
"\n");
out.Write(" if ({} != 0u)\n", BitfieldExtract<&PostMtxInfo::normalize>("postMtxInfo"));
out.Write(" output_tex.xyz = normalize(output_tex.xyz);\n"
"\n"
" // multiply by postmatrix\n"
" output_tex.xyz = float3(dot(P0.xyz, output_tex.xyz) + P0.w,\n"
" dot(P1.xyz, output_tex.xyz) + P1.w,\n"
" dot(P2.xyz, output_tex.xyz) + P2.w);\n"
" }}\n\n");
// When q is 0, the GameCube appears to have a special case
// This can be seen in devkitPro's neheGX Lesson08 example for Wii
// Makes differences in Rogue Squadron 3 (Hoth sky) and The Last Story (shadow culling)
out.Write(" if (texgentype == {:s} && output_tex.z == 0.0)\n", TexGenType::Regular);
out.Write(
" output_tex.xy = clamp(output_tex.xy / 2.0f, float2(-1.0f,-1.0f), float2(1.0f,1.0f));\n"
"\n");
out.Write(" // Hopefully GPUs that can support dynamic indexing will optimize this.\n");
out.Write(" switch (texgen) {{\n");
for (u32 i = 0; i < num_texgen; i++)
out.Write(" case {}u: o.tex{} = output_tex; break;\n", i, i);
out.Write(" }}\n"
"}}\n");
}
void EnumerateVertexShaderUids(const std::function<void(const VertexShaderUid&)>& callback)
{
VertexShaderUid uid;
for (u32 texgens = 0; texgens <= 8; texgens++)
{
vertex_ubershader_uid_data* const vuid = uid.GetUidData();
vuid->num_texgens = texgens;
callback(uid);
}
}
} // namespace UberShader
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