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// Copyright 2016 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "VideoCommon/LightingShaderGen.h"
#include "Common/Assert.h"
#include "Common/CommonTypes.h"
#include "VideoCommon/ShaderGenCommon.h"
#include "VideoCommon/XFMemory.h"
static void GenerateLightShader(ShaderCode& object, const LightingUidData& uid_data, int index,
int litchan_index, bool alpha)
{
const char* swizzle = alpha ? "a" : "rgb";
const char* swizzle_components = (alpha) ? "" : "3";
const auto attnfunc =
static_cast<AttenuationFunc>((uid_data.attnfunc >> (2 * litchan_index)) & 0x3);
const auto diffusefunc =
static_cast<DiffuseFunc>((uid_data.diffusefunc >> (2 * litchan_index)) & 0x3);
switch (attnfunc)
{
case AttenuationFunc::None:
case AttenuationFunc::Dir:
object.Write("ldir = normalize(" LIGHT_POS ".xyz - pos.xyz);\n", LIGHT_POS_PARAMS(index));
object.Write("attn = 1.0;\n");
object.Write("if (length(ldir) == 0.0)\n\t ldir = _normal;\n");
break;
case AttenuationFunc::Spec:
object.Write("ldir = normalize(" LIGHT_POS ".xyz - pos.xyz);\n", LIGHT_POS_PARAMS(index));
object.Write("attn = (dot(_normal, ldir) >= 0.0) ? max(0.0, dot(_normal, " LIGHT_DIR
".xyz)) : 0.0;\n",
LIGHT_DIR_PARAMS(index));
object.Write("cosAttn = " LIGHT_COSATT ".xyz;\n", LIGHT_COSATT_PARAMS(index));
object.Write("distAttn = {}(" LIGHT_DISTATT ".xyz);\n",
(diffusefunc == DiffuseFunc::None) ? "" : "normalize",
LIGHT_DISTATT_PARAMS(index));
object.Write("attn = max(0.0f, dot(cosAttn, float3(1.0, attn, attn*attn))) / dot(distAttn, "
"float3(1.0, attn, attn*attn));\n");
break;
case AttenuationFunc::Spot:
object.Write("ldir = " LIGHT_POS ".xyz - pos.xyz;\n", LIGHT_POS_PARAMS(index));
object.Write("dist2 = dot(ldir, ldir);\n"
"dist = sqrt(dist2);\n"
"ldir = ldir / dist;\n"
"attn = max(0.0, dot(ldir, " LIGHT_DIR ".xyz));\n",
LIGHT_DIR_PARAMS(index));
// attn*attn may overflow
object.Write("attn = max(0.0, " LIGHT_COSATT ".x + " LIGHT_COSATT ".y*attn + " LIGHT_COSATT
".z*attn*attn) / dot(" LIGHT_DISTATT ".xyz, float3(1.0,dist,dist2));\n",
LIGHT_COSATT_PARAMS(index), LIGHT_COSATT_PARAMS(index), LIGHT_COSATT_PARAMS(index),
LIGHT_DISTATT_PARAMS(index));
break;
}
switch (diffusefunc)
{
case DiffuseFunc::None:
object.Write("lacc.{} += int{}(round(attn * float{}(" LIGHT_COL ")));\n", swizzle,
swizzle_components, swizzle_components, LIGHT_COL_PARAMS(index, swizzle));
break;
case DiffuseFunc::Sign:
case DiffuseFunc::Clamp:
object.Write("lacc.{} += int{}(round(attn * {}dot(ldir, _normal)) * float{}(" LIGHT_COL
")));\n",
swizzle, swizzle_components, diffusefunc != DiffuseFunc::Sign ? "max(0.0," : "(",
swizzle_components, LIGHT_COL_PARAMS(index, swizzle));
break;
default:
ASSERT(false);
}
object.Write("\n");
}
// vertex shader
// lights/colors
// materials name is I_MATERIALS in vs and I_PMATERIALS in ps
void GenerateLightingShaderHeader(ShaderCode& object, const LightingUidData& uid_data)
{
for (u32 j = 0; j < NUM_XF_COLOR_CHANNELS; j++)
{
object.Write("vec4 dolphin_calculate_lighting_chn{}(vec4 base_color, vec3 pos, vec3 _normal)\n",
j);
object.Write("{{\n");
object.Write("\tint4 lacc;\n"
"\tvec3 ldir, h, cosAttn, distAttn;\n"
"\tfloat dist, dist2, attn;\n");
const bool colormatsource = !!(uid_data.matsource & (1 << j));
if (colormatsource) // from vertex
object.Write("\tint4 mat = int4(round(base_color * 255.0));\n");
else // from color
object.Write("\tint4 mat = {}[{}];\n", I_MATERIALS, j + 2);
if ((uid_data.enablelighting & (1 << j)) != 0)
{
if ((uid_data.ambsource & (1 << j)) != 0) // from vertex
object.Write("\tlacc = int4(round(base_color * 255.0));\n");
else // from color
object.Write("\tlacc = {}[{}];\n", I_MATERIALS, j);
}
else
{
object.Write("\tlacc = int4(255, 255, 255, 255);\n");
}
// check if alpha is different
const bool alphamatsource = !!(uid_data.matsource & (1 << (j + 2)));
if (alphamatsource != colormatsource)
{
if (alphamatsource) // from vertex
object.Write("\tmat.w = int(round(base_color.w * 255.0));\n");
else // from color
object.Write("\tmat.w = {}[{}].w;\n", I_MATERIALS, j + 2);
}
if ((uid_data.enablelighting & (1 << (j + 2))) != 0)
{
if ((uid_data.ambsource & (1 << (j + 2))) != 0) // from vertex
object.Write("\tlacc.w = int(round(base_color.w * 255.0));\n");
else // from color
object.Write("\tlacc.w = {}[{}].w;\n", I_MATERIALS, j);
}
else
{
object.Write("\tlacc.w = 255;\n");
}
if ((uid_data.enablelighting & (1 << j)) != 0) // Color lights
{
for (int i = 0; i < 8; ++i)
{
if ((uid_data.light_mask & (1 << (i + 8 * j))) != 0)
GenerateLightShader(object, uid_data, i, j, false);
}
}
if ((uid_data.enablelighting & (1 << (j + 2))) != 0) // Alpha lights
{
for (int i = 0; i < 8; ++i)
{
if ((uid_data.light_mask & (1 << (i + 8 * (j + 2)))) != 0)
GenerateLightShader(object, uid_data, i, j + 2, true);
}
}
object.Write("\tlacc = clamp(lacc, 0, 255);\n");
object.Write("\treturn vec4((mat * (lacc + (lacc >> 7))) >> 8) / 255.0;\n");
object.Write("}}\n\n");
}
}
void GetLightingShaderUid(LightingUidData& uid_data)
{
for (u32 j = 0; j < NUM_XF_COLOR_CHANNELS; j++)
{
uid_data.matsource |= static_cast<u32>(xfmem.color[j].matsource.Value()) << j;
uid_data.matsource |= static_cast<u32>(xfmem.alpha[j].matsource.Value()) << (j + 2);
uid_data.enablelighting |= xfmem.color[j].enablelighting << j;
uid_data.enablelighting |= xfmem.alpha[j].enablelighting << (j + 2);
if ((uid_data.enablelighting & (1 << j)) != 0) // Color lights
{
uid_data.ambsource |= static_cast<u32>(xfmem.color[j].ambsource.Value()) << j;
uid_data.attnfunc |= static_cast<u32>(xfmem.color[j].attnfunc.Value()) << (2 * j);
uid_data.diffusefunc |= static_cast<u32>(xfmem.color[j].diffusefunc.Value()) << (2 * j);
uid_data.light_mask |= xfmem.color[j].GetFullLightMask() << (8 * j);
}
if ((uid_data.enablelighting & (1 << (j + 2))) != 0) // Alpha lights
{
uid_data.ambsource |= static_cast<u32>(xfmem.alpha[j].ambsource.Value()) << (j + 2);
uid_data.attnfunc |= static_cast<u32>(xfmem.alpha[j].attnfunc.Value()) << (2 * (j + 2));
uid_data.diffusefunc |= static_cast<u32>(xfmem.alpha[j].diffusefunc.Value()) << (2 * (j + 2));
uid_data.light_mask |= xfmem.alpha[j].GetFullLightMask() << (8 * (j + 2));
}
}
}
static void GenerateCustomLightingImpl(ShaderCode* out, const LightingUidData& uid_data, int index,
int litchan_index, u32 channel_index, u32 custom_light_index,
bool alpha)
{
const auto attnfunc =
static_cast<AttenuationFunc>((uid_data.attnfunc >> (2 * litchan_index)) & 0x3);
const std::string_view light_type = alpha ? "alpha" : "color";
const std::string name = fmt::format("lights_chan{}_{}", channel_index, light_type);
out->Write("\t{{\n");
out->Write("\t\tfrag_input.{}[{}].direction = " LIGHT_DIR ".xyz;\n", name, custom_light_index,
LIGHT_DIR_PARAMS(index));
out->Write("\t\tfrag_input.{}[{}].position = " LIGHT_POS ".xyz;\n", name, custom_light_index,
LIGHT_POS_PARAMS(index));
out->Write("\t\tfrag_input.{}[{}].cosatt = " LIGHT_COSATT ";\n", name, custom_light_index,
LIGHT_COSATT_PARAMS(index));
out->Write("\t\tfrag_input.{}[{}].distatt = " LIGHT_DISTATT ";\n", name, custom_light_index,
LIGHT_DISTATT_PARAMS(index));
out->Write("\t\tfrag_input.{}[{}].attenuation_type = {};\n", name, custom_light_index,
static_cast<u32>(attnfunc));
if (alpha)
{
out->Write("\t\tfrag_input.{}[{}].color = float3(" LIGHT_COL
") / float3(255.0, 255.0, 255.0);\n",
name, custom_light_index, LIGHT_COL_PARAMS(index, alpha ? "a" : "rgb"));
}
else
{
out->Write("\t\tfrag_input.{}[{}].color = " LIGHT_COL " / float3(255.0, 255.0, 255.0);\n", name,
custom_light_index, LIGHT_COL_PARAMS(index, alpha ? "a" : "rgb"));
}
out->Write("\t}}\n");
}
void GenerateCustomLighting(ShaderCode* out, const LightingUidData& uid_data)
{
for (u32 i = 0; i < 8; i++)
{
for (u32 channel_index = 0; channel_index < NUM_XF_COLOR_CHANNELS; channel_index++)
{
out->Write("\tfrag_input.lights_chan{}_color[{}].direction = float3(0, 0, 0);\n",
channel_index, i);
out->Write("\tfrag_input.lights_chan{}_color[{}].position = float3(0, 0, 0);\n",
channel_index, i);
out->Write("\tfrag_input.lights_chan{}_color[{}].color = float3(0, 0, 0);\n", channel_index,
i);
out->Write("\tfrag_input.lights_chan{}_color[{}].cosatt = float4(0, 0, 0, 0);\n",
channel_index, i);
out->Write("\tfrag_input.lights_chan{}_color[{}].distatt = float4(0, 0, 0, 0);\n",
channel_index, i);
out->Write("\tfrag_input.lights_chan{}_color[{}].attenuation_type = 0;\n", channel_index, i);
out->Write("\tfrag_input.lights_chan{}_alpha[{}].direction = float3(0, 0, 0);\n",
channel_index, i);
out->Write("\tfrag_input.lights_chan{}_alpha[{}].position = float3(0, 0, 0);\n",
channel_index, i);
out->Write("\tfrag_input.lights_chan{}_alpha[{}].color = float3(0, 0, 0);\n", channel_index,
i);
out->Write("\tfrag_input.lights_chan{}_alpha[{}].cosatt = float4(0, 0, 0, 0);\n",
channel_index, i);
out->Write("\tfrag_input.lights_chan{}_alpha[{}].distatt = float4(0, 0, 0, 0);\n",
channel_index, i);
out->Write("\tfrag_input.lights_chan{}_alpha[{}].attenuation_type = 0;\n", channel_index, i);
}
}
for (u32 j = 0; j < NUM_XF_COLOR_CHANNELS; j++)
{
const bool colormatsource = !!(uid_data.matsource & (1 << j));
if (colormatsource) // from vertex
out->Write("frag_input.base_material[{}] = frag_input.color_{};\n", j, j);
else // from color
out->Write("frag_input.base_material[{}] = {}[{}] / 255.0;\n", j, I_MATERIALS, j + 2);
if ((uid_data.enablelighting & (1 << j)) != 0)
{
if ((uid_data.ambsource & (1 << j)) != 0) // from vertex
out->Write("frag_input.ambient_lighting[{}] = frag_input.color_{};\n", j, j);
else // from color
out->Write("frag_input.ambient_lighting[{}] = {}[{}] / 255.0;\n", j, I_MATERIALS, j);
}
else
{
out->Write("frag_input.ambient_lighting[{}] = float4(1, 1, 1, 1);\n", j);
}
// check if alpha is different
const bool alphamatsource = !!(uid_data.matsource & (1 << (j + 2)));
if (alphamatsource != colormatsource)
{
if (alphamatsource) // from vertex
out->Write("frag_input.base_material[{}].w = frag_input.color_{}.w;\n", j, j);
else // from color
out->Write("frag_input.base_material[{}].w = {}[{}].w / 255.0;\n", j, I_MATERIALS, j + 2);
}
if ((uid_data.enablelighting & (1 << (j + 2))) != 0)
{
if ((uid_data.ambsource & (1 << (j + 2))) != 0) // from vertex
out->Write("frag_input.ambient_lighting[{}].w = frag_input.color_{}.w;\n", j, j);
else // from color
out->Write("frag_input.ambient_lighting[{}].w = {}[{}].w / 255.0;\n", j, I_MATERIALS, j);
}
else
{
out->Write("frag_input.ambient_lighting[{}].w = 1;\n", j);
}
u32 light_count = 0;
if ((uid_data.enablelighting & (1 << j)) != 0) // Color lights
{
for (int i = 0; i < 8; ++i)
{
if ((uid_data.light_mask & (1 << (i + 8 * j))) != 0)
{
GenerateCustomLightingImpl(out, uid_data, i, j, j, light_count, false);
light_count++;
}
}
}
out->Write("\tfrag_input.light_chan{}_color_count = {};\n", j, light_count);
light_count = 0;
if ((uid_data.enablelighting & (1 << (j + 2))) != 0) // Alpha lights
{
for (int i = 0; i < 8; ++i)
{
if ((uid_data.light_mask & (1 << (i + 8 * (j + 2)))) != 0)
{
GenerateCustomLightingImpl(out, uid_data, i, j + 2, j, light_count, true);
light_count++;
}
}
}
out->Write("\tfrag_input.light_chan{}_alpha_count = {};\n", j, light_count);
}
}
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