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drape/utils/projection.cpp
34 строки
971 B
Daria Volvenkova
[vulkan] Correction of Y and Z coordinates moved to the shaders.
01 мар 2019, 10:45
01 мар 2019, 10:45
162cdde
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#include "drape/utils/projection.hpp" namespace dp { std::array<float, 16> MakeProjection(dp::ApiVersion apiVersion, float left, float right, float bottom, float top) { std::array<float, 16> result = {}; // Projection matrix is calculated for [-1;1] depth-space, in some APIs (e.g. Metal) // depth-space is [0;1], so we have to remap projection matrix. float depthScale = 1.0f; float depthOffset = 0.0f; if (apiVersion == dp::ApiVersion::Metal) { depthScale = 0.5f; depthOffset = 0.5f; } float const width = right - left; float const height = top - bottom; float const depth = kMaxDepth - kMinDepth; result[0] = 2.0f / width; result[3] = -(right + left) / width; result[5] = 2.0f / height; result[7] = -(top + bottom) / height; result[10] = -2.0f * depthScale / depth; result[11] = depthOffset - (kMaxDepth + kMinDepth) / depth; result[15] = 1.0; return result; } } // namespace dp