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Doom3ShaderLayer.h
612 lines (493 loc) · 16 KB
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Doom3ShaderLayer.h
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#pragma once
#include <vector>
#include "ishaders.h"
#include "math/Vector4.h"
#include "MapExpression.h"
#include "NamedBindable.h"
namespace shaders
{
typedef std::pair<std::string, std::string> StringPair;
class ShaderTemplate;
/**
* \brief
* Implementation of ShaderLayer for Doom 3 shaders.
*/
class Doom3ShaderLayer
: public ShaderLayer
{
public:
// An enum used to select which colour components are affected by an operation
enum ColourComponentSelector
{
COMP_RED, // red only
COMP_GREEN, // green only
COMP_BLUE, // blue only
COMP_ALPHA, // alpha only
COMP_RGB, // red, green and blue
COMP_RGBA, // all: red, greeb, blue, alpha
};
private:
// The owning material template
ShaderTemplate& _material;
// The registers keeping the results of expression evaluations
Registers _registers;
// The expressions used in this stage
typedef std::vector<IShaderExpressionPtr> Expressions;
Expressions _expressions;
static const IShaderExpressionPtr NULL_EXPRESSION;
static const std::size_t NOT_DEFINED = std::numeric_limits<std::size_t>::max();
// The condition register for this stage. Points to a register to be interpreted as bool.
std::size_t _condition;
// The bindable texture for this stage
NamedBindablePtr _bindableTex;
// The Texture object, created from the bindable texture
mutable TexturePtr _texture;
// Layer type (diffuse, bump, specular or nothing)
Type _type;
// Map type (map, cubemap, mirrorRenderMap, etc.)
MapType _mapType;
// Blend function as strings (e.g. "gl_one", "gl_zero")
StringPair _blendFuncStrings;
// Multiplicative layer colour (set with "red 0.6", "green 0.2" etc)
// The 4 numbers are indices into the registers array in the parent material
std::size_t _colIdx[4];
// Vertex colour blend mode
VertexColourMode _vertexColourMode;
// Cube map mode
CubeMapMode _cubeMapMode;
// Flags for this stage (forceHighQuality, ignoreAlphaTest, etc.)
int _stageFlags;
// Per-stage clamping
ClampType _clampType;
// Alpha test value, pointing into the register array. 0 means no test, otherwise must be within (0 - 1]
std::size_t _alphaTest;
// texgen normal, reflect, skybox, wobblesky
TexGenType _texGenType;
std::size_t _texGenParams[3]; // 3 registers for wobblesky texgen
IShaderExpressionPtr _texGenExpressions[3]; // the 3 expressions
// The register indices of this stage's scale expressions
std::size_t _scale[2];
std::size_t _scaleExpression[2];
// The register indices of this stage's translate expressions
std::size_t _translation[2];
std::size_t _translationExpression[2];
// The rotation register index
std::size_t _rotation;
std::size_t _rotationExpression;
// The register indices of this stage's shear expressions
std::size_t _shear[2];
std::size_t _shearExpression[2];
// The shader programs used in this stage
std::string _vertexProgram;
std::string _fragmentProgram;
// A variable sized array of vertexParms (or rather their indices into the registers array)
// since a single vertex parm consists of 4 values, the _vertexParms array is usually of size 0, 4, 8, etc.
std::vector<std::size_t> _vertexParms;
// The array of fragment maps
std::vector<MapExpressionPtr> _fragmentMaps;
// Stage-specific polygon offset, is 0 if not used
float _privatePolygonOffset;
Vector2 _renderMapSize;
int _parseFlags;
public:
// Constructor
Doom3ShaderLayer(ShaderTemplate& material,
ShaderLayer::Type type = ShaderLayer::BLEND,
const NamedBindablePtr& btex = NamedBindablePtr());
/* ShaderLayer implementation */
TexturePtr getTexture() const;
BlendFunc getBlendFunc() const;
Colour4 getColour() const;
VertexColourMode getVertexColourMode() const;
CubeMapMode getCubeMapMode() const;
MapType getMapType() const override;
void setMapType(MapType type);
const Vector2& getRenderMapSize() override;
void setRenderMapSize(const Vector2& size);
bool hasAlphaTest() const override;
float getAlphaTest() const override;
// True if the condition for this stage is fulfilled
// (expressions must have been evaluated before this call)
bool isVisible() const
{
return _registers[_condition] != 0;
}
void setCondition(const IShaderExpressionPtr& conditionExpr)
{
// Store the expression in our list
_expressions.push_back(conditionExpr);
// Link the result to our local registers
_condition = conditionExpr->linkToRegister(_registers);
}
void evaluateExpressions(std::size_t time)
{
for (const auto& i : _expressions)
{
i->evaluate(time);
}
}
void evaluateExpressions(std::size_t time, const IRenderEntity& entity)
{
for (const auto& i : _expressions)
{
i->evaluate(time, entity);
}
}
/**
* \brief
* Set the bindable texture object.
*/
void setBindableTexture(NamedBindablePtr btex)
{
_bindableTex = btex;
}
/**
* \brief
* Get the bindable texture object.
*/
NamedBindablePtr getBindableTexture() const
{
return _bindableTex;
}
/**
* \brief
* Set the layer type.
*/
void setLayerType(ShaderLayer::Type type)
{
_type = type;
}
/**
* \brief
* Get the layer type.
*/
ShaderLayer::Type getType() const
{
return _type;
}
int getStageFlags() const
{
return _stageFlags;
}
void setStageFlags(int flags)
{
_stageFlags = flags;
}
void setStageFlag(ShaderLayer::Flags flag)
{
_stageFlags |= flag;
}
void clearStageFlag(ShaderLayer::Flags flag)
{
_stageFlags &= ~flag;
}
ClampType getClampType() const
{
return _clampType;
}
void setClampType(ClampType type)
{
_clampType = type;
}
TexGenType getTexGenType() const
{
return _texGenType;
}
void setTexGenType(TexGenType type)
{
_texGenType = type;
}
float getTexGenParam(std::size_t index) const override
{
assert(index < 3);
return _registers[_texGenParams[index]];
}
IShaderExpressionPtr getTexGenExpression(std::size_t index) const override
{
assert(index < 3);
return _texGenExpressions[index];
}
void setTexGenExpression(std::size_t index, const IShaderExpressionPtr& expression)
{
assert(index < 3);
// Store the expression in our list
_expressions.push_back(expression);
_texGenExpressions[index] = expression;
_texGenParams[index] = expression->linkToRegister(_registers);
}
/**
* \brief
* Set the blend function string.
*/
void setBlendFuncStrings(const StringPair& func)
{
_blendFuncStrings = func;
}
const StringPair& getBlendFuncStrings() const override
{
return _blendFuncStrings;
}
/**
* \brief
* Set vertex colour mode.
*/
void setVertexColourMode(VertexColourMode mode)
{
_vertexColourMode = mode;
}
/**
* \brief
* Set the colour to a constant Vector4. Calling this method
* will override any colour expressions that might have been assigned to
* this shader layer at an earlier point.
*/
void setColour(const Vector4& col);
/**
* Set the given colour component to use the given expression. This can be a single
* component out of the 4 available ones (R, G, B, A) or one of the two combos RGB and RGBA.
*/
void setColourExpression(ColourComponentSelector comp, const IShaderExpressionPtr& expr);
/**
* \brief
* Set a texture object (overrides the map expression when getTexture is
* called).
*/
void setTexture(const TexturePtr& tex)
{
_texture = tex;
}
Vector2 getScale()
{
return Vector2(_registers[_scale[0]], _registers[_scale[1]]);
}
const shaders::IShaderExpressionPtr& getScaleExpression(std::size_t index) override
{
assert(index < 2);
if (getStageFlags() & FLAG_CENTERSCALE)
{
return NULL_EXPRESSION;
}
auto expressionIndex = _scaleExpression[index];
return expressionIndex != NOT_DEFINED ? _expressions[expressionIndex] : NULL_EXPRESSION;
}
const shaders::IShaderExpressionPtr& getCenterScaleExpression(std::size_t index) override
{
assert(index < 2);
if ((getStageFlags() & FLAG_CENTERSCALE) == 0)
{
return NULL_EXPRESSION;
}
auto expressionIndex = _scaleExpression[index];
return expressionIndex != NOT_DEFINED ? _expressions[expressionIndex] : NULL_EXPRESSION;
}
/**
* Set the scale expressions of this stage, overwriting any previous scales.
*/
void setScale(const IShaderExpressionPtr& xExpr, const IShaderExpressionPtr& yExpr)
{
_scaleExpression[0] = _expressions.size();
_expressions.emplace_back(xExpr);
_scaleExpression[1] = _expressions.size();
_expressions.emplace_back(yExpr);
_scale[0] = xExpr->linkToRegister(_registers);
_scale[1] = yExpr->linkToRegister(_registers);
}
Vector2 getTranslation()
{
return Vector2(_registers[_translation[0]], _registers[_translation[1]]);
}
const shaders::IShaderExpressionPtr& getTranslationExpression(std::size_t index)
{
assert(index < 2);
auto expressionIndex = _translationExpression[index];
return expressionIndex != NOT_DEFINED ? _expressions[expressionIndex] : NULL_EXPRESSION;
}
/**
* Set the "translate" expressions of this stage, overwriting any previous expressions.
*/
void setTranslation(const IShaderExpressionPtr& xExpr, const IShaderExpressionPtr& yExpr)
{
_translationExpression[0] = _expressions.size();
_expressions.emplace_back(xExpr);
_translationExpression[1] = _expressions.size();
_expressions.emplace_back(yExpr);
_translation[0] = xExpr->linkToRegister(_registers);
_translation[1] = yExpr->linkToRegister(_registers);
}
float getRotation()
{
return _registers[_rotation];
}
const shaders::IShaderExpressionPtr& getRotationExpression() override
{
return _rotationExpression != NOT_DEFINED ? _expressions[_rotationExpression] : NULL_EXPRESSION;
}
/**
* Set the "rotate" expression of this stage, overwriting any previous one.
*/
void setRotation(const IShaderExpressionPtr& expr)
{
_rotationExpression = _expressions.size();
_expressions.emplace_back(expr);
_rotation = expr->linkToRegister(_registers);
}
Vector2 getShear()
{
return Vector2(_registers[_shear[0]], _registers[_shear[1]]);
}
const shaders::IShaderExpressionPtr& getShearExpression(std::size_t index) override
{
assert(index < 2);
auto expressionIndex = _shearExpression[index];
return expressionIndex != NOT_DEFINED ? _expressions[expressionIndex] : NULL_EXPRESSION;
}
/**
* Set the shear expressions of this stage, overwriting any previous ones.
*/
void setShear(const IShaderExpressionPtr& xExpr, const IShaderExpressionPtr& yExpr)
{
_shearExpression[0] = _expressions.size();
_expressions.emplace_back(xExpr);
_shearExpression[1] = _expressions.size();
_expressions.emplace_back(yExpr);
_shear[0] = xExpr->linkToRegister(_registers);
_shear[1] = yExpr->linkToRegister(_registers);
}
/**
* \brief
* Set cube map mode.
*/
void setCubeMapMode(CubeMapMode mode)
{
_cubeMapMode = mode;
}
/**
* \brief
* Set alphatest expression
*/
void setAlphaTest(const IShaderExpressionPtr& expr)
{
_expressions.push_back(expr);
_alphaTest = expr->linkToRegister(_registers);
}
// Returns the value of the given register
float getRegisterValue(std::size_t index) const
{
assert(index < _registers.size());
return _registers[index];
}
void setRegister(std::size_t index, float value)
{
assert(index < _registers.size());
_registers[index] = value;
}
// Allocates a new register, initialised with the given value
std::size_t getNewRegister(float newVal)
{
_registers.push_back(newVal);
return _registers.size() - 1;
}
// Vertex program name
const std::string& getVertexProgram()
{
return _vertexProgram;
}
void setVertexProgram(const std::string& name)
{
_vertexProgram = name;
}
Vector4 getVertexParm(int parm)
{
if (static_cast<std::size_t>(parm) >= _vertexParms.size() / 4)
{
return Vector4(0,0,0,1);
}
std::size_t offset = parm * 4;
return Vector4(_registers[_vertexParms[offset+0]], _registers[_vertexParms[offset+1]],
_registers[_vertexParms[offset+2]], _registers[_vertexParms[offset+3]]);
}
void setVertexParm(int parm, const IShaderExpressionPtr& parm0,
const IShaderExpressionPtr& parm1 = IShaderExpressionPtr(),
const IShaderExpressionPtr& parm2 = IShaderExpressionPtr(),
const IShaderExpressionPtr& parm3 = IShaderExpressionPtr())
{
assert(parm0);
_expressions.push_back(parm0);
std::size_t parm0Reg = parm0->linkToRegister(_registers);
_vertexParms.push_back(parm0Reg);
if (parm1)
{
_expressions.push_back(parm1);
_vertexParms.push_back(parm1->linkToRegister(_registers));
if (parm2)
{
_expressions.push_back(parm2);
_vertexParms.push_back(parm2->linkToRegister(_registers));
if (parm3)
{
_expressions.push_back(parm3);
_vertexParms.push_back(parm3->linkToRegister(_registers));
}
else
{
// No fourth parameter set, set w to 1
_vertexParms.push_back(REG_ONE);
}
}
else
{
// Only 2 expressions given, set z and w to 0 and 1, respectively.
_vertexParms.push_back(REG_ZERO);
_vertexParms.push_back(REG_ONE);
}
}
else
{
// no parm1 given, repeat the one we have 4 times => insert 3 more times
_vertexParms.insert(_vertexParms.end(), 3, parm0Reg);
}
// At this point the array needs to be empty or its size a multiple of 4
assert(_vertexParms.size() % 4 == 0);
}
// Fragment program name
const std::string& getFragmentProgram()
{
return _fragmentProgram;
}
void setFragmentProgram(const std::string& name)
{
_fragmentProgram = name;
}
std::size_t getNumFragmentMaps()
{
return _fragmentMaps.size();
}
TexturePtr getFragmentMap(int index);
void setFragmentMap(std::size_t index, const MapExpressionPtr& map)
{
assert(index >= 0);
if (index >= _fragmentMaps.size())
{
_fragmentMaps.resize(index + 1);
}
_fragmentMaps[index] = map;
}
float getPrivatePolygonOffset()
{
return _privatePolygonOffset;
}
void setPrivatePolygonOffset(float value)
{
_privatePolygonOffset = value;
}
std::string getMapImageFilename() override;
shaders::IMapExpression::Ptr getMapExpression() override;
int getParseFlags() override;
void setParseFlag(ParseFlags flag);
};
/**
* \brief
* Pointer typedef for Doom3ShaderLayer.
*/
typedef std::shared_ptr<Doom3ShaderLayer> Doom3ShaderLayerPtr;
}