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Add correction funtion
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2 changed files with 30 additions and 4 deletions
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@ -11,7 +11,7 @@
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#define S3L_FLAT 0
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#define S3L_STRICT_NEAR_CULLING 0
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#define S3L_PERSPECTIVE_CORRECTION 1
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#define S3L_PERSPECTIVE_CORRECTION 2
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#define S3L_SORT 2
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#define S3L_STENCIL_BUFFER 1
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#define S3L_Z_BUFFER 0
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@ -80,6 +80,8 @@ void drawPixel(S3L_PixelInfo *p)
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{
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/*
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S3L_correctBarycentricCoords(p->barycentric);
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if (p->barycentric[0] < 0 || p->barycentric[0] > 512)
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printf("%d %d %d\n",p->barycentric[0],p->barycentric[1],p->barycentric[2]);
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30
small3dlib.h
30
small3dlib.h
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@ -448,9 +448,11 @@ typedef struct
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triangle and interpolate values between it's
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three points. Each one goes from 0 to
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S3L_FRACTIONS_PER_UNIT (inclidung), but due to
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rounding error may fall outside this range. The
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sum of the three coordinates will always be
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exactly S3L_FRACTIONS_PER_UNIT. */
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rounding error may fall outside this range (you
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can use S3L_correctBarycentricCoords to fix this
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for the price of some performance). The sum of
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the three coordinates will always be exactly
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S3L_FRACTIONS_PER_UNIT. */
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S3L_Index triangleIndex; ///< Triangle index.
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S3L_Index modelIndex;
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S3L_Unit depth; ///< Depth (only if depth is turned on).
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@ -466,6 +468,12 @@ typedef struct
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static inline void S3L_initPixelInfo(S3L_PixelInfo *p);
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/** Corrects barycentric coordinates so that they exactly meet the defined
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conditions (each fall into <0,S3L_FRACTIONS_PER_UNIT>, sum =
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S3L_FRACTIONS_PER_UNIT). Note that doing this per-pixel can slow the program
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down significantly. */
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static inline void S3LcorrectBarycentricCoords(S3L_Unit barycentric[3]);
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// general helper functions
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static inline S3L_Unit S3L_abs(S3L_Unit value);
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static inline S3L_Unit S3L_min(S3L_Unit v1, S3L_Unit v2);
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@ -1138,6 +1146,22 @@ S3L_Unit S3L_cos(S3L_Unit x)
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return S3L_sin(x - S3L_FRACTIONS_PER_UNIT / 4);
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}
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void S3L_correctBarycentricCoords(S3L_Unit barycentric[3])
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{
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barycentric[0] = S3L_clamp(barycentric[0],0,S3L_FRACTIONS_PER_UNIT);
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barycentric[1] = S3L_clamp(barycentric[1],0,S3L_FRACTIONS_PER_UNIT);
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S3L_Unit d = S3L_FRACTIONS_PER_UNIT - barycentric[0] - barycentric[1];
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if (d < 0)
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{
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barycentric[0] += d;
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barycentric[2] = 0;
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}
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else
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barycentric[2] = d;
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}
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void S3L_makeTranslationMat(
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S3L_Unit offsetX,
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S3L_Unit offsetY,
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