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35 lines
971 B
C++
35 lines
971 B
C++
#include "drape/utils/projection.hpp"
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namespace dp
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{
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std::array<float, 16> MakeProjection(dp::ApiVersion apiVersion, float left, float right,
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float bottom, float top)
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{
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std::array<float, 16> result = {};
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// Projection matrix is calculated for [-1;1] depth-space, in some APIs (e.g. Metal)
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// depth-space is [0;1], so we have to remap projection matrix.
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float depthScale = 1.0f;
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float depthOffset = 0.0f;
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if (apiVersion == dp::ApiVersion::Metal)
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{
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depthScale = 0.5f;
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depthOffset = 0.5f;
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}
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float const width = right - left;
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float const height = top - bottom;
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float const depth = kMaxDepth - kMinDepth;
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result[0] = 2.0f / width;
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result[3] = -(right + left) / width;
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result[5] = 2.0f / height;
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result[7] = -(top + bottom) / height;
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result[10] = -2.0f * depthScale / depth;
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result[11] = depthOffset - (kMaxDepth + kMinDepth) / depth;
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result[15] = 1.0;
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return result;
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}
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} // namespace dp
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