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91 lines
3.5 KiB
91 lines
3.5 KiB
/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// OpenGL Image Copyright (c) 2008 - 2011 G-Truc Creation (www.g-truc.net) |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// Created : 2008-12-19 |
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// Updated : 2010-09-27 |
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// Licence : This source is under MIT License |
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// File : gli/gtx/fetch.inl |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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namespace gli{ |
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namespace gtx{ |
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namespace fetch |
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{ |
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template <typename genType> |
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inline genType texelFetch |
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( |
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texture2D const & Image, |
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texture2D::dimensions_type const & TexCoord, |
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texture2D::level_type const & Level |
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) |
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{ |
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assert(Image[Level].format() == R8U || Image[Level].format() == RG8U || Image[Level].format() == RGB8U || Image[Level].format() == RGBA8U); |
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texture2D::dimensions_type Dimensions = Image[Level].dimensions(); |
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texture2D::value_type const * const Data = Image[Level].data(); |
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return reinterpret_cast<genType const * const>(Data)[TexCoord.x + TexCoord.y * Dimensions.x]; |
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} |
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template <typename genType> |
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inline genType textureLod |
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( |
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texture2D const & Image, |
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texture2D::texcoord_type const & TexCoord, |
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texture2D::level_type const & Level |
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) |
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{ |
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assert(Image[Level].format() == R8U || Image[Level].format() == RG8U || Image[Level].format() == RGB8U || Image[Level].format() == RGBA8U); |
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texture2D::dimensions_type Dimensions = Image[Level].dimensions(); |
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texture2D::value_type const * const Data = Image[Level].data(); |
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std::size_t s_below = std::size_t(glm::floor(TexCoord.s * float(Dimensions.x - 1))); |
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std::size_t s_above = std::size_t(glm::ceil( TexCoord.s * float(Dimensions.x - 1))); |
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std::size_t t_below = std::size_t(glm::floor(TexCoord.t * float(Dimensions.y - 1))); |
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std::size_t t_above = std::size_t(glm::ceil( TexCoord.t * float(Dimensions.y - 1))); |
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float s_step = 1.0f / float(Dimensions.x); |
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float t_step = 1.0f / float(Dimensions.y); |
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float s_below_normalized = s_below / float(Dimensions.x); |
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float s_above_normalized = s_above / float(Dimensions.x); |
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float t_below_normalized = t_below / float(Dimensions.y); |
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float t_above_normalized = t_above / float(Dimensions.y); |
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genType Value1 = reinterpret_cast<genType const * const>(Data)[s_below + t_below * Dimensions.x]; |
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genType Value2 = reinterpret_cast<genType const * const>(Data)[s_above + t_below * Dimensions.x]; |
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genType Value3 = reinterpret_cast<genType const * const>(Data)[s_above + t_above * Dimensions.x]; |
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genType Value4 = reinterpret_cast<genType const * const>(Data)[s_below + t_above * Dimensions.x]; |
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float BlendA = float(TexCoord.s - s_below_normalized) * float(Dimensions.x - 1); |
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float BlendB = float(TexCoord.s - s_below_normalized) * float(Dimensions.x - 1); |
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float BlendC = float(TexCoord.t - t_below_normalized) * float(Dimensions.y - 1); |
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genType ValueA(glm::mix(Value1, Value2, BlendA)); |
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genType ValueB(glm::mix(Value4, Value3, BlendB)); |
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return genType(glm::mix(ValueA, ValueB, BlendC)); |
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} |
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template <typename genType> |
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void texelWrite |
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( |
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texture2D & Image, |
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texture2D::dimensions_type const & Texcoord, |
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texture2D::level_type const & Level, |
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genType const & Color |
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) |
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{ |
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genType * Data = (genType*)Image[Level].data(); |
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std::size_t Index = Texcoord.x + Texcoord.y * Image[Level].dimensions().x; |
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std::size_t Capacity = Image[Level].capacity(); |
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assert(Index < Capacity); |
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*(Data + Index) = Color; |
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} |
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}//namespace fetch |
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}//namespace gtx |
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}//namespace gli
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