code cleanup: move local math functions into math_geom.c, math_vector.c, no functional changes.

4 files changed, 39 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_geom.h b/source/blender/blenlib/BLI_math_geom.h
index 80169e952bf..509927e589c 100644
--- a/source/blender/blenlib/BLI_math_geom.h
+++ b/source/blender/blenlib/BLI_math_geom.h
@@ -187,6 +187,10 @@ int barycentric_inside_triangle_v2(const float w[3]);
 void resolve_tri_uv(float r_uv[2], const float st[2], const float st0[2], const float st1[2], const float st2[2]);
 void resolve_quad_uv(float uv[2], const float st[2], const float st0[2], const float st1[2], const float st2[2], const float st3[2]);
 
+/* use to find the point of a UV on a face */
+void interp_bilinear_quad_v3(float data[4][3], float u, float v, float res[3]);
+void interp_barycentric_tri_v3(float data[3][3], float u, float v, float res[3]);
+
 /***************************** View & Projection *****************************/
 
 void lookat_m4(float mat[4][4], float vx, float vy, 
diff --git a/source/blender/blenlib/BLI_math_vector.h b/source/blender/blenlib/BLI_math_vector.h
index 77c0ec0a88f..5f80d1e52d7 100644
--- a/source/blender/blenlib/BLI_math_vector.h
+++ b/source/blender/blenlib/BLI_math_vector.h
@@ -169,6 +169,7 @@ void interp_v4_v4v4v4v4(float p[4], const float v1[4], const float v2[4], const
 
 void mid_v3_v3v3(float r[3], const float a[3], const float b[3]);
 void mid_v2_v2v2(float r[2], const float a[2], const float b[2]);
+void mid_v3_v3v3v3(float v[3], const float v1[3], const float v2[3], const float v3[3]);
 
 /********************************* Comparison ********************************/
 
diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c
index e10229f11da..cd726179f56 100644
--- a/source/blender/blenlib/intern/math_geom.c
+++ b/source/blender/blenlib/intern/math_geom.c
@@ -2399,6 +2399,33 @@ void resolve_quad_uv(float r_uv[2], const float st[2], const float st0[2], const
 
 #undef IS_ZERO
 
+/* reverse of the functions above */
+void interp_bilinear_quad_v3(float data[4][3], float u, float v, float res[3])
+{
+	float vec[3];
+
+	copy_v3_v3(res, data[0]);
+	mul_v3_fl(res, (1 - u) * (1 - v));
+	copy_v3_v3(vec, data[1]);
+	mul_v3_fl(vec, u * (1 - v)); add_v3_v3(res, vec);
+	copy_v3_v3(vec, data[2]);
+	mul_v3_fl(vec, u * v); add_v3_v3(res, vec);
+	copy_v3_v3(vec, data[3]);
+	mul_v3_fl(vec, (1 - u) * v); add_v3_v3(res, vec);
+}
+
+void interp_barycentric_tri_v3(float data[3][3], float u, float v, float res[3])
+{
+	float vec[3];
+
+	copy_v3_v3(res, data[0]);
+	mul_v3_fl(res, u);
+	copy_v3_v3(vec, data[1]);
+	mul_v3_fl(vec, v); add_v3_v3(res, vec);
+	copy_v3_v3(vec, data[2]);
+	mul_v3_fl(vec, 1.0f - u - v); add_v3_v3(res, vec);
+}
+
 /***************************** View & Projection *****************************/
 
 void orthographic_m4(float matrix[][4], const float left, const float right, const float bottom, const float top,
diff --git a/source/blender/blenlib/intern/math_vector.c b/source/blender/blenlib/intern/math_vector.c
index 976895fe6fc..7f578fe305d 100644
--- a/source/blender/blenlib/intern/math_vector.c
+++ b/source/blender/blenlib/intern/math_vector.c
@@ -115,6 +115,13 @@ void mid_v2_v2v2(float v[2], const float v1[2], const float v2[2])
 	v[1] = 0.5f * (v1[1] + v2[1]);
 }
 
+void mid_v3_v3v3v3(float v[3], const float v1[3], const float v2[3], const float v3[3])
+{
+	v[0] = (v1[0] + v2[0] + v3[0]) / 3.0f;
+	v[1] = (v1[1] + v2[1] + v3[1]) / 3.0f;
+	v[2] = (v1[2] + v2[2] + v3[2]) / 3.0f;
+}
+
 /********************************** Angles ***********************************/
 
 /* Return the angle in radians between vecs 1-2 and 2-3 in radians