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#pragma once
#include "itextstream.h"
#include "ExpressionSlots.h"
namespace shaders
{
/**
* Encapsulates the texture matrix handling, connecting and nesting
* the expressions that are used to calculate the matrix components.
*
* Only the 6 relevant components of the texture matrix are linked to
* registers and possibly expressions:
*
* | m00 m01 0 m02 |
* | m10 m11 0 m12 |
* | 0 0 1 0 |
* | 0 0 0 1 |
*/
class TextureMatrix
{
private:
ExpressionSlots& _expressions;
Registers& _registers;
struct TemporaryMatrix;
public:
TextureMatrix(ExpressionSlots& expressions, Registers& registers);
TextureMatrix(const TextureMatrix& other) = delete;
// Sets the expression slot bindings such that the matrix will evaluate to identity
void setIdentity();
// Return the matrix as stored in the registers
Matrix4 getMatrix4();
// pre-multiply the given transformation matrix to the existing one
void applyTransformation(const IShaderLayer::Transformation& transformation);
private:
void multiplyMatrix(const TemporaryMatrix& matrix);
IShaderExpression::Ptr add(const IShaderExpression::Ptr& a, const IShaderExpression::Ptr& b);
IShaderExpression::Ptr multiply(const IShaderExpression::Ptr& a, ExpressionSlot& b);
// Shortcut accessors
ExpressionSlot& xx() { return _expressions[IShaderLayer::Expression::TextureMatrixRow0Col0]; }
ExpressionSlot& yx() { return _expressions[IShaderLayer::Expression::TextureMatrixRow0Col1]; }
ExpressionSlot& yy() { return _expressions[IShaderLayer::Expression::TextureMatrixRow1Col1]; }
ExpressionSlot& xy() { return _expressions[IShaderLayer::Expression::TextureMatrixRow1Col0]; }
ExpressionSlot& tx() { return _expressions[IShaderLayer::Expression::TextureMatrixRow0Col2]; }
ExpressionSlot& ty() { return _expressions[IShaderLayer::Expression::TextureMatrixRow1Col2]; }
};
}
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