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#pragma once
#include "i18n.h"
#include "ishaders.h"
#include "ishaderlayer.h"
#include "string/predicate.h"
namespace shaders
{
/**
* Helper class handling the two default frob stages on TDM materials.
* The two frob stages look like this:
*
* // Blend _white stage
* {
* if ( parm11 > 0 )
* blend gl_dst_color, gl_one
* map _white
* rgb 0.40 * parm11
* }
*
* // Additive blend of the material's diffuse map
* {
* if ( parm11 > 0 )
* blend add
* map textures/numbers/0
* rgb 0.15 * parm11
* }
*/
constexpr const char* const FrobCondition = "(parm11 > 0)";
constexpr const char* const AdditiveRgbExpression = "0.15 * parm11";
constexpr const char* const WhiteBlendRgbExpression = "0.4 * parm11";
constexpr const char* const WhiteBlendFuncSrc = "gl_dst_color";
constexpr const char* const WhiteBlendFuncDest = "gl_one";
constexpr const char* const WhiteBlendMap = "_white";
class FrobStageSetup
{
public:
static bool HasWhiteBlendStage(const MaterialPtr& material)
{
return FindWhiteBlendStage(material).first != nullptr;
}
static bool HasAdditiveDiffuseStage(const MaterialPtr& material)
{
return FindAdditiveDiffuseStage(material).first != nullptr;
}
// Checks whether the default frob stages are present on this material
static bool IsPresent(const MaterialPtr& material)
{
if (!material) return false;
auto diffuse = GetDiffuseMap(material);
return !diffuse.empty() && HasWhiteBlendStage(material) && HasAdditiveDiffuseStage(material);
}
// Add the needed frob stages to this material
static void AddToMaterial(const MaterialPtr& material)
{
if (!material) return;
if (!HasAdditiveDiffuseStage(material))
{
AddAdditiveDiffuseStage(material);
}
if (!HasWhiteBlendStage(material))
{
AddWhiteBlendStage(material);
}
}
// Removes the two frob stages from this material
static void RemoveFromMaterial(const MaterialPtr& material)
{
if (!material) return;
auto additiveStage = FindAdditiveDiffuseStage(material);
if (additiveStage.second > 0)
{
material->removeLayer(static_cast<std::size_t>(additiveStage.second));
}
auto whiteBlendStage = FindWhiteBlendStage(material);
if (whiteBlendStage.second > 0)
{
material->removeLayer(static_cast<std::size_t>(whiteBlendStage.second));
}
}
static std::string GetDiffuseMap(const MaterialPtr& material)
{
auto diffuseMap = std::string();
material->foreachLayer([&](const IShaderLayer::Ptr& layer)
{
if (layer->getType() == IShaderLayer::DIFFUSE && layer->getMapExpression())
{
diffuseMap = layer->getMapExpression()->getExpressionString();
return false;
}
return true;
});
return diffuseMap;
}
private:
static std::vector<IShaderLayer::Ptr> getAllLayers(const MaterialPtr& material)
{
std::vector<IShaderLayer::Ptr> layers;
material->foreachLayer([&](const IShaderLayer::Ptr& layer)
{
layers.push_back(layer);
return true;
});
return layers;
}
static std::pair<IShaderLayer::Ptr, int> FindWhiteBlendStage(const MaterialPtr& material)
{
auto layers = getAllLayers(material);
for (int index = 0; index < layers.size(); ++index)
{
const auto& layer = layers[index];
// if ( parm11 > 0 )
if (!layer->getConditionExpression() || layer->getConditionExpression()->getExpressionString() != FrobCondition)
{
continue;
}
// blend gl_dst_color, gl_one
if (layer->getBlendFuncStrings().first != WhiteBlendFuncSrc || layer->getBlendFuncStrings().second != WhiteBlendFuncDest)
{
continue;
}
// map _white (or _white.tga)
if (!layer->getMapExpression() || !string::starts_with(layer->getMapExpression()->getExpressionString(), WhiteBlendMap))
{
continue;
}
// rgb 0.40 * parm11
auto rgb = layer->getColourExpression(IShaderLayer::COMP_RGB);
if (rgb && rgb->getExpressionString() == WhiteBlendRgbExpression)
{
return std::make_pair(layer, index);
}
}
return std::make_pair(IShaderLayer::Ptr(), -1);
}
static std::pair<IShaderLayer::Ptr, int> FindAdditiveDiffuseStage(const MaterialPtr& material)
{
auto diffuse = GetDiffuseMap(material);
if (diffuse.empty()) return std::make_pair(IShaderLayer::Ptr(), -1);
auto layers = getAllLayers(material);
for (int index = 0; index < layers.size(); ++index)
{
const auto& layer = layers[index];
// if ( parm11 > 0 )
if (!layer->getConditionExpression() || layer->getConditionExpression()->getExpressionString() != FrobCondition)
{
continue;
}
// blend add
if (layer->getBlendFuncStrings().first != "add" || !layer->getBlendFuncStrings().second.empty())
{
continue;
}
// map <diffuse>
if (!layer->getMapExpression() || layer->getMapExpression()->getExpressionString() != diffuse)
{
continue;
}
// rgb 0.15 * parm11
auto rgb = layer->getColourExpression(IShaderLayer::COMP_RGB);
if (rgb && rgb->getExpressionString() == AdditiveRgbExpression)
{
return std::make_pair(layer, index);
}
}
return std::make_pair(IShaderLayer::Ptr(), -1);
}
static void AddAdditiveDiffuseStage(const MaterialPtr& material)
{
auto index = material->addLayer(IShaderLayer::BLEND);
auto stage = material->getEditableLayer(index);
auto diffuse = GetDiffuseMap(material);
if (diffuse.empty())
{
throw std::runtime_error(_("No diffusemap present, cannot add the frob stages."));
}
stage->setConditionExpressionFromString(FrobCondition);
stage->setBlendFuncStrings({ "add", "" });
stage->setMapExpressionFromString(diffuse);
stage->setColourExpressionFromString(IShaderLayer::COMP_RGB, AdditiveRgbExpression);
}
static void AddWhiteBlendStage(const MaterialPtr& material)
{
auto index = material->addLayer(IShaderLayer::BLEND);
auto stage = material->getEditableLayer(index);
stage->setConditionExpressionFromString(FrobCondition);
stage->setBlendFuncStrings({ WhiteBlendFuncSrc, WhiteBlendFuncDest });
stage->setMapExpressionFromString(WhiteBlendMap);
stage->setColourExpressionFromString(IShaderLayer::COMP_RGB, WhiteBlendRgbExpression);
}
};
}
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