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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| #include "TextureMatrix.h" | ||
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| #include "ShaderExpression.h" | ||
| #include "Doom3ShaderSystem.h" | ||
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| namespace shaders | ||
| { | ||
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| struct TextureMatrix::TemporaryMatrix | ||
| { | ||
| IShaderExpression::Ptr xx; | ||
| IShaderExpression::Ptr yx; | ||
| IShaderExpression::Ptr tx; | ||
| IShaderExpression::Ptr xy; | ||
| IShaderExpression::Ptr yy; | ||
| IShaderExpression::Ptr ty; | ||
| }; | ||
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| TextureMatrix::TextureMatrix(ExpressionSlots& expressions, Registers& registers) : | ||
| _expressions(expressions), | ||
| _registers(registers) | ||
| {} | ||
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| void TextureMatrix::setIdentity() | ||
| { | ||
| // Initialise the texture matrix to identity (set the diagonals to 1) | ||
| xx().registerIndex = REG_ONE; | ||
| yx().registerIndex = REG_ZERO; | ||
| tx().registerIndex = REG_ZERO; | ||
| xy().registerIndex = REG_ZERO; | ||
| yy().registerIndex = REG_ONE; | ||
| ty().registerIndex = REG_ZERO; | ||
| } | ||
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| Matrix4 TextureMatrix::getMatrix4() | ||
| { | ||
| auto matrix = Matrix4::getIdentity(); | ||
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| matrix.xx() = _registers[xx().registerIndex]; | ||
| matrix.yx() = _registers[yx().registerIndex]; | ||
| matrix.tx() = _registers[tx().registerIndex]; | ||
| matrix.xy() = _registers[xy().registerIndex]; | ||
| matrix.yy() = _registers[yy().registerIndex]; | ||
| matrix.ty() = _registers[ty().registerIndex]; | ||
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| return matrix; | ||
| } | ||
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| void TextureMatrix::applyTransformation(const IShaderLayer::Transformation& transformation) | ||
| { | ||
| TemporaryMatrix matrix; | ||
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| switch (transformation.type) | ||
| { | ||
| case IShaderLayer::TransformType::Translate: | ||
| matrix.xx = ShaderExpression::createConstant(1); | ||
| matrix.yx = ShaderExpression::createConstant(0); | ||
| matrix.tx = transformation.expression1; | ||
| matrix.xy = ShaderExpression::createConstant(0); | ||
| matrix.yy = ShaderExpression::createConstant(1); | ||
| matrix.ty = transformation.expression2; | ||
| break; | ||
| case IShaderLayer::TransformType::Scale: | ||
| matrix.xx = transformation.expression1; | ||
| matrix.yx = ShaderExpression::createConstant(0); | ||
| matrix.tx = ShaderExpression::createConstant(0); | ||
| matrix.xy = ShaderExpression::createConstant(0); | ||
| matrix.yy = transformation.expression2; | ||
| matrix.ty = ShaderExpression::createConstant(0); | ||
| break; | ||
| case IShaderLayer::TransformType::CenterScale: | ||
| matrix.xx = transformation.expression1; | ||
| matrix.yx = ShaderExpression::createConstant(0); | ||
| matrix.tx = ShaderExpression::createAddition( | ||
| ShaderExpression::createConstant(0.5), | ||
| ShaderExpression::createMultiplication(ShaderExpression::createConstant(-0.5), transformation.expression1) | ||
| ); | ||
| matrix.xy = ShaderExpression::createConstant(0); | ||
| matrix.yy = transformation.expression2; | ||
| matrix.ty = ShaderExpression::createAddition( | ||
| ShaderExpression::createConstant(0.5), | ||
| ShaderExpression::createMultiplication(ShaderExpression::createConstant(-0.5), transformation.expression2) | ||
| ); | ||
| break; | ||
| case IShaderLayer::TransformType::Shear: | ||
| matrix.xx = ShaderExpression::createConstant(1); | ||
| matrix.yx = transformation.expression1; | ||
| matrix.tx = ShaderExpression::createMultiplication(ShaderExpression::createConstant(-0.5), transformation.expression1); | ||
| matrix.xy = transformation.expression2; | ||
| matrix.yy = ShaderExpression::createConstant(1); | ||
| matrix.ty = ShaderExpression::createMultiplication(ShaderExpression::createConstant(-0.5), transformation.expression2); | ||
| break; | ||
| case IShaderLayer::TransformType::Rotate: | ||
| { | ||
| auto sinTable = GetShaderSystem()->getTableForName("sinTable"); | ||
| auto cosTable = GetShaderSystem()->getTableForName("cosTable"); | ||
|
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| if (!sinTable || !cosTable) | ||
| { | ||
| rWarning() << "Cannot create rotate stage transform without sinTable and cosTable declarations" << std::endl; | ||
| break; | ||
| } | ||
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| // sin(expr) and cos(expr) shortcuts | ||
| auto sinExpr = ShaderExpression::createTableLookup(sinTable, transformation.expression1); | ||
| auto cosExpr = ShaderExpression::createTableLookup(cosTable, transformation.expression1); | ||
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| matrix.xx = ShaderExpression::createTableLookup(cosTable, transformation.expression1); | ||
| matrix.yx = ShaderExpression::createMultiplication( | ||
| ShaderExpression::createConstant(-1), | ||
| ShaderExpression::createTableLookup(sinTable, transformation.expression1) | ||
| ); | ||
| matrix.tx = ShaderExpression::createAddition( | ||
| ShaderExpression::createConstant(0.5), | ||
| ShaderExpression::createAddition( | ||
| ShaderExpression::createMultiplication(ShaderExpression::createConstant(-0.5), cosExpr), | ||
| ShaderExpression::createMultiplication(ShaderExpression::createConstant(+0.5), sinExpr) | ||
| ) | ||
| ); | ||
| matrix.xy = ShaderExpression::createTableLookup(sinTable, transformation.expression1); | ||
| matrix.yy = ShaderExpression::createTableLookup(cosTable, transformation.expression1); | ||
| matrix.ty = ShaderExpression::createAddition( | ||
| ShaderExpression::createConstant(0.5), | ||
| ShaderExpression::createAddition( | ||
| ShaderExpression::createMultiplication(ShaderExpression::createConstant(-0.5), sinExpr), | ||
| ShaderExpression::createMultiplication(ShaderExpression::createConstant(-0.5), cosExpr) | ||
| ) | ||
| ); | ||
| break; | ||
| } | ||
| default: | ||
| return; | ||
| }; | ||
|
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| multiplyMatrix(matrix); | ||
| } | ||
|
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| void TextureMatrix::multiplyMatrix(const TemporaryMatrix& matrix) | ||
| { | ||
| auto xx = add(multiply(matrix.xx, this->xx()), multiply(matrix.yx, this->xy())); | ||
| auto xy = add(multiply(matrix.xy, this->xx()), multiply(matrix.yy, this->xy())); | ||
| auto yx = add(multiply(matrix.xx, this->yx()), multiply(matrix.yx, this->yy())); | ||
| auto yy = add(multiply(matrix.xy, this->yx()), multiply(matrix.yy, this->yy())); | ||
| auto tx = add(add(multiply(matrix.xx, this->tx()), multiply(matrix.yx, this->ty())), matrix.tx); | ||
| auto ty = add(add(multiply(matrix.xy, this->tx()), multiply(matrix.yy, this->ty())), matrix.ty); | ||
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| _expressions.assign(IShaderLayer::Expression::TextureMatrixRow0Col0, xx, REG_ONE); | ||
| _expressions.assign(IShaderLayer::Expression::TextureMatrixRow0Col1, yx, REG_ZERO); | ||
| _expressions.assign(IShaderLayer::Expression::TextureMatrixRow1Col1, yy, REG_ONE); | ||
| _expressions.assign(IShaderLayer::Expression::TextureMatrixRow1Col0, xy, REG_ZERO); | ||
| _expressions.assign(IShaderLayer::Expression::TextureMatrixRow0Col2, tx, REG_ZERO); | ||
| _expressions.assign(IShaderLayer::Expression::TextureMatrixRow1Col2, ty, REG_ZERO); | ||
| } | ||
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| IShaderExpression::Ptr TextureMatrix::add(const IShaderExpression::Ptr& a, const IShaderExpression::Ptr& b) | ||
| { | ||
| return ShaderExpression::createAddition(a, b); | ||
| } | ||
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| IShaderExpression::Ptr TextureMatrix::multiply(const IShaderExpression::Ptr& a, ExpressionSlot& b) | ||
| { | ||
| // Create a constant if there's no expression in the slot yet | ||
| auto bExpr = b.expression ? b.expression : ShaderExpression::createConstant(_registers[b.registerIndex]); | ||
|
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| return ShaderExpression::createMultiplication(a, bExpr); | ||
| } | ||
|
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| } |
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