Add extra v2, v3 operations (cross, length etc)
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89
dqnt.h
89
dqnt.h
@ -47,12 +47,12 @@ typedef float f32;
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#define DQNT_MAX(a, b) ((a) < (b) ? (b) : (a))
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#define DQNT_MIN(a, b) ((a) < (b) ? (a) : (b))
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#define DQNT_SQUARED(x) ((x) * (x))
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#define DQNT_SQRT(x) (sqrtf(x))
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////////////////////////////////////////////////////////////////////////////////
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// Math
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////////////////////////////////////////////////////////////////////////////////
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DQNT_FILE_SCOPE f32 dqnt_lerp(f32 a, f32 t, f32 b);
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DQNT_FILE_SCOPE f32 dqnt_math_lerp(f32 a, f32 t, f32 b);
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DQNT_FILE_SCOPE f32 dqnt_math_sqrtf(f32 a);
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////////////////////////////////////////////////////////////////////////////////
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// Vec2
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@ -75,6 +75,12 @@ DQNT_FILE_SCOPE DqntV2 dqnt_v2_hadamard(DqntV2 a, DqntV2 b);
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DQNT_FILE_SCOPE f32 dqnt_v2_dot (DqntV2 a, DqntV2 b);
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DQNT_FILE_SCOPE bool dqnt_v2_equals (DqntV2 a, DqntV2 b);
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DQNT_FILE_SCOPE f32 dqnt_v2_length_squared(DqntV2 a, DqntV2 b);
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DQNT_FILE_SCOPE f32 dqnt_v2_length (DqntV2 a, DqntV2 b);
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DQNT_FILE_SCOPE DqntV2 dqnt_v2_normalise (DqntV2 a);
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DQNT_FILE_SCOPE bool dqnt_v2_overlaps (DqntV2 a, DqntV2 b);
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DQNT_FILE_SCOPE DqntV2 dqnt_v2_perpendicular (DqntV2 a);
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// Resize the dimension to fit the aspect ratio provided. Downscale only.
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DQNT_FILE_SCOPE DqntV2 dqnt_v2_constrain_to_ratio(DqntV2 dim, DqntV2 ratio);
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@ -99,6 +105,8 @@ DQNT_FILE_SCOPE DqntV3 dqnt_v3_hadamard(DqntV3 a, DqntV3 b);
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DQNT_FILE_SCOPE f32 dqnt_v3_dot (DqntV3 a, DqntV3 b);
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DQNT_FILE_SCOPE bool dqnt_v3_equals (DqntV3 a, DqntV3 b);
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DQNT_FILE_SCOPE DqntV3 dqnt_v3_cross(DqntV3 a, DqntV3 b);
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////////////////////////////////////////////////////////////////////////////////
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// Vec4
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////////////////////////////////////////////////////////////////////////////////
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@ -222,7 +230,7 @@ DQNT_FILE_SCOPE i32 dqnt_rnd_pcg_range(DqntRandPCGState *pcg, i32 min, i32 max)
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////////////////////////////////////////////////////////////////////////////////
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// Math
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////////////////////////////////////////////////////////////////////////////////
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DQNT_FILE_SCOPE f32 dqnt_lerp(f32 a, f32 t, f32 b)
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DQNT_FILE_SCOPE f32 dqnt_math_lerp(f32 a, f32 t, f32 b)
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{
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/*
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Linear blend between two values. We having a starting point "a", and
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@ -240,6 +248,12 @@ DQNT_FILE_SCOPE f32 dqnt_lerp(f32 a, f32 t, f32 b)
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return result;
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}
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DQNT_FILE_SCOPE f32 dqnt_math_sqrtf(f32 a)
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{
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f32 result = sqrtf(a);
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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// Vec2
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////////////////////////////////////////////////////////////////////////////////
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@ -318,6 +332,59 @@ DQNT_FILE_SCOPE inline bool dqnt_v2_equals(DqntV2 a, DqntV2 b)
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return result;
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}
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DQNT_FILE_SCOPE inline f32 dqnt_v2_length_squared(DqntV2 a, DqntV2 b)
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{
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f32 x = b.x - a.x;
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f32 y = b.y - a.y;
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f32 result = (DQNT_SQUARED(x) + DQNT_SQUARED(y));
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return result;
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}
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DQNT_FILE_SCOPE inline f32 dqnt_v2_length(DqntV2 a, DqntV2 b)
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{
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f32 lengthSq = dqnt_v2_length_squared(a, b);
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f32 result = dqnt_math_sqrtf(lengthSq);
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return result;
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}
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DQNT_FILE_SCOPE inline DqntV2 dqnt_v2_normalise(DqntV2 a)
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{
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f32 magnitude = dqnt_v2_length(dqnt_v2(0, 0), a);
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DqntV2 result = dqnt_v2(a.x, a.y);
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result = dqnt_v2_scale(a, 1 / magnitude);
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return result;
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}
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DQNT_FILE_SCOPE inline bool dqnt_v2_overlaps(DqntV2 a, DqntV2 b)
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{
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bool result = false;
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f32 lenOfA = a.max - a.min;
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f32 lenOfB = b.max - b.min;
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if (lenOfA > lenOfB)
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{
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DqntV2 tmp = a;
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a = b;
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b = tmp;
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}
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if ((a.min >= b.min && a.min <= b.max) ||
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(a.max >= b.min && a.max <= b.max))
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{
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result = true;
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}
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return result;
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}
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DQNT_FILE_SCOPE inline DqntV2 dqnt_v2_perpendicular(DqntV2 a)
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{
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DqntV2 result = {a.y, -a.x};
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return result;
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}
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DQNT_FILE_SCOPE DqntV2 dqnt_v2_constrain_to_ratio(DqntV2 dim, DqntV2 ratio)
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{
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DqntV2 result = {};
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@ -410,6 +477,22 @@ DQNT_FILE_SCOPE inline bool dqnt_v3_equals(DqntV3 a, DqntV3 b)
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return result;
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}
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DQNT_FILE_SCOPE inline DqntV3 dqnt_v3_cross(DqntV3 a, DqntV3 b)
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{
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/*
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CROSS PRODUCT
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Generate a perpendicular vector to the 2 vectors
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|a| |d| |bf - ce|
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|b| x |e| = |cd - af|
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|c| |f| |ae - be|
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*/
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DqntV3 result = {};
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result.e[0] = (a.e[1] * b.e[2]) - (a.e[2] * b.e[1]);
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result.e[1] = (a.e[2] * b.e[0]) - (a.e[0] * b.e[2]);
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result.e[2] = (a.e[0] * b.e[1]) - (a.e[1] * b.e[0]);
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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// Vec4
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////////////////////////////////////////////////////////////////////////////////
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@ -1,5 +1,4 @@
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#define DQNT_IMPLEMENTATION
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#define DQNT_MAKE_STATIC
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#include "dqnt.h"
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#include "stdio.h"
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@ -300,19 +299,24 @@ void dqnt_math_test()
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f32 start = 10;
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f32 t = 0.5f;
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f32 end = 20;
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DQNT_ASSERT(dqnt_lerp(start, t, end) == 15);
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DQNT_ASSERT(dqnt_math_lerp(start, t, end) == 15);
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}
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{
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f32 start = 10;
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f32 t = 2.0f;
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f32 end = 20;
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DQNT_ASSERT(dqnt_lerp(start, t, end) == 30);
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DQNT_ASSERT(dqnt_math_lerp(start, t, end) == 30);
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}
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printf("dqnt_math_test(): lerp: Completed successfully\n");
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}
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{ // sqrtf
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DQNT_ASSERT(dqnt_math_sqrtf(4.0f) == 2.0f);
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printf("dqnt_math_test(): sqrtf: Completed successfully\n");
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}
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printf("dqnt_math_test(): Completed successfully\n");
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}
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@ -358,6 +362,29 @@ void dqnt_vec_test()
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DQNT_ASSERT(dotResult == 55);
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}
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// V2 Properties
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{
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DqntV2 a = dqnt_v2(0, 0);
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DqntV2 b = dqnt_v2(3, 4);
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f32 lengthSq = dqnt_v2_length_squared(a, b);
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DQNT_ASSERT(lengthSq == 25);
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f32 length = dqnt_v2_length(a, b);
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DQNT_ASSERT(length == 5);
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DqntV2 normalised = dqnt_v2_normalise(b);
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DQNT_ASSERT(normalised.x == (b.x / 5.0f));
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DQNT_ASSERT(normalised.y == (b.y / 5.0f));
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DqntV2 c = dqnt_v2(3.5f, 8.0f);
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DQNT_ASSERT(dqnt_v2_overlaps(b, c) == true);
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DQNT_ASSERT(dqnt_v2_overlaps(b, a) == false);
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DqntV2 d = dqnt_v2_perpendicular(c);
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DQNT_ASSERT(dqnt_v2_dot(c, d) == 0);
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}
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{ // constrain_to_ratio
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DqntV2 ratio = dqnt_v2(16, 9);
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DqntV2 dim = dqnt_v2(2000, 1080);
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@ -406,6 +433,9 @@ void dqnt_vec_test()
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f32 dotResult = dqnt_v3_dot(dqnt_v3(5, 10, 2), dqnt_v3(3, 4, 6));
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DQNT_ASSERT(dotResult == 67);
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DqntV3 cross = dqnt_v3_cross(vecA, vecB);
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DQNT_ASSERT(dqnt_v3_equals(cross, dqnt_v3(15, 0, -5)) == true);
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}
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printf("dqnt_vec_test(): vec3: Completed successfully\n");
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@ -465,7 +495,7 @@ int main(void)
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dqnt_vec_test();
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dqnt_other_test();
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printf("\nPress Any Key to Exit\n");
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printf("\nPress 'Enter' Key to Exit\n");
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getchar();
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return 0;
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