Transformations #43
Transformations #43
Conversation
WalkthroughA new C++ module library "logos" providing a templated Mat matrix type and transformation helpers (MakeRotationY, MakeRotationX, Scale) was added and integrated into the build. main.cpp was refactored to use these helpers for uniform uploads; README marked Transformations done; one test add_test() was removed. Changes
Sequence Diagram(s)sequenceDiagram
participant App as main.cpp
participant Logos as logos module
App->>Logos: MakeRotationY(yaw)
Logos-->>App: Mat<float,4,4> rotY
App->>Logos: MakeRotationX(-pitch)
Logos-->>App: Mat<float,4,4> rotX
App->>Logos: Scale(0.1F)
Logos-->>App: Mat<float,4,4> scale
rect rgba(120,180,200,0.12)
note over App: Compose transforms (operator*)
App->>App: rotY * rotX * scale -> composed
end
App->>App: composed.data() → pointer
App-->>GPU: SDL_PushGPUVertexUniformData(pointer, sizeof(matrix))
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes
Possibly related PRs
Poem
Pre-merge checks and finishing touches✅ Passed checks (3 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
🧹 Nitpick comments (3)
logos/modules/logos.ixx (2)
20-24: Missingconstoverload for single-argumentoperator().The single-argument accessor for column vectors lacks a
constoverload, which prevents read-only access to vector elements.TScalar& operator()(std::uint8_t row) requires(Col == 1) { return m_data[row][0]; } + const TScalar& operator()(std::uint8_t row) const + requires(Col == 1) + { + return m_data[row][0]; + }
25-25: Missingconstoverload fordata()method.Add a
constversion to allow read-only access to the underlying data.TScalar* data() { return m_data[0].data(); } + const TScalar* data() const { return m_data[0].data(); }main.cpp (1)
86-86: Consider removing the unusedcammember variable.The
cammember and its initialization (lines 187-193) are no longer used for storing camera data since the matrix is now computed inline. Thesizeof(cam.m)could be replaced withsizeof(float) * 16or a named constant.
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CMakeLists.txt(1 hunks)README.md(1 hunks)glsl_reflector/CMakeLists.txt(0 hunks)logos/CMakeLists.txt(1 hunks)logos/modules/logos.ixx(1 hunks)main.cpp(2 hunks)
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- glsl_reflector/CMakeLists.txt
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🔇 Additional comments (9)
logos/modules/logos.ixx (4)
26-45: Matrix multiplication implementation looks correct.The templated
operator*correctly handles matrix dimension compatibility at compile time and implements standard matrix multiplication with proper accumulation.
48-73: Rotation matrix implementation is correct.The Y-axis rotation matrix follows the standard right-handed coordinate system convention.
75-100: LGTM!The X-axis rotation matrix is correctly implemented.
102-125: LGTM!The uniform scaling matrix is correctly implemented with the homogeneous coordinate preserved.
CMakeLists.txt (2)
123-123: LGTM!The logos subdirectory is correctly added to the build.
126-126: LGTM!The logos library is correctly linked to the SDL_TEST target.
README.md (1)
14-14: LGTM!The track list is correctly updated to reflect the completed transformations feature.
main.cpp (1)
29-29: LGTM!The logos module import is correctly added.
logos/CMakeLists.txt (1)
1-11: LGTM!The CMake configuration correctly sets up a C++20 module library using the modern
FILE_SETapproach for module sources. CMake 3.30 is appropriate for stable C++ modules support.
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Actionable comments posted: 0
🧹 Nitpick comments (2)
logos/modules/logos.ixx (2)
20-25: Add const overloads for complete const-correctness.The single-argument
operator()(row)anddata()methods lack const overloads, limiting their use with const Mat instances.Add const overloads:
TScalar& operator()(std::uint8_t row) requires(Col == 1) { return m_data[row][0]; } + const TScalar& operator()(std::uint8_t row) const + requires(Col == 1) + { + return m_data[row][0]; + } TScalar* data() { return m_data[0].data(); } + const TScalar* data() const { return m_data[0].data(); }
102-125: Scale matrix is correctly implemented.The uniform scale matrix correctly applies the scale factor to x, y, and z components while preserving the homogeneous coordinate.
Minor formatting: remove the extra blank line at Line 104.
export Mat<float, 4, 4> Scale(float scale_size) { - Mat<float, 4, 4> R{};
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logos/modules/logos.ixx(1 hunks)main.cpp(2 hunks)
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- main.cpp
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🔇 Additional comments (4)
logos/modules/logos.ixx (4)
12-13: Mat class is now correctly exported.The
exportkeyword has been added to the Mat class template declaration, addressing the previous review concern. Users can now accesssopho::Mat<...>and chain matrix operations as needed.
26-45: Matrix multiplication implementation is correct.The operator* correctly implements standard matrix multiplication with proper dimension handling and dot product computation.
48-73: Y-axis rotation matrix is correctly implemented.The rotation matrix follows the standard right-handed Y-axis rotation formula with proper placement of cosine and sine terms.
75-100: X-axis rotation matrix is correctly implemented.The rotation matrix follows the standard right-handed X-axis rotation formula with proper placement of cosine and sine terms.
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