3d options

[vg.git] / src / vg / vg_m.h

diff --git a/src/vg/vg_m.h b/src/vg/vg_m.h
index 392eb2f09c9d7645350320255b8e489bb37ae43a..b46a33176db74ad6626cda75837f31db10b3e1e7 100644 (file)
--- a/src/vg/vg_m.h
+++ b/src/vg/vg_m.h
@@ -18,6 +18,11 @@ static inline float vg_clampf( float a, float min, float max )
        return vg_minf( max, vg_maxf( a, min ) );
 }
 
+static inline float vg_signf( float a )
+{
+   return a < 0.0f? -1.0f: 1.0f;
+}
+
 #define VG_MIN( A, B ) ((A)<(B)?(A):(B))
 #define VG_MAX( A, B ) ((A)>(B)?(A):(B))
 
@@ -282,6 +287,20 @@ static inline void v3_fill( v3f a, float v )
        a[2] = v;
 }
 
+static inline void v3_floor( v3f a, v3f b )
+{
+   b[0] = floorf( a[0] );
+   b[1] = floorf( a[1] );
+   b[2] = floorf( a[2] );
+}
+
+static inline void v3_negate( v3f a, v3f b )
+{
+   b[0] = -a[0];
+   b[1] = -a[1];
+   b[2] = -a[2];
+}
+
 /*
  * Vector 4
  */
@@ -295,6 +314,14 @@ static inline void v4_zero( v4f a )
        a[0] = 0.f; a[1] = 0.f; a[2] = 0.f; a[3] = 0.f;
 }
 
+static inline void v4_muladds( v3f a, v3f b, float s, v3f d )
+{
+       d[0] = a[0]+b[0]*s; 
+   d[1] = a[1]+b[1]*s;
+   d[2] = a[2]+b[2]*s;
+   d[3] = a[3]+b[3]*s;
+}
+
 /*
  * Matrix 2x2
  */
@@ -618,6 +645,18 @@ static inline void m4x3_rotate_z( m4x3f m, float angle )
        m4x3_mul( m, t, m );
 }
 
+static inline void m4x3_expand( m4x3f m, m4x4f d )
+{
+   v3_copy( m[0], d[0] );
+   v3_copy( m[1], d[1] );
+   v3_copy( m[2], d[2] );
+   v3_copy( m[3], d[3] );
+   d[0][3] = 0.0f;
+   d[1][3] = 0.0f;
+   d[2][3] = 0.0f;
+   d[3][3] = 1.0f;
+}
+
 static inline void m4x3_expand_aabb_point( m4x3f m, boxf box, v3f point )
 {
        v3f v;
@@ -658,6 +697,93 @@ static inline void m4x3_transform_aabb( m4x3f m, boxf box )
        m4x3_expand_aabb_point( m, box, (v3f){ b[0], b[1], b[2] } );
 }
 
+/*
+ * Matrix 4x4
+ */
+
+#define M4X4_IDENTITY  {{1.0f, 0.0f, 0.0f, 0.0f },\
+                                                               { 0.0f, 1.0f, 0.0f, 0.0f },\
+                                                               { 0.0f, 0.0f, 1.0f, 0.0f },\
+                                                               { 0.0f, 0.0f, 0.0f, 1.0f }}
+
+static void m4x4_projection( m4x4f m, float angle,
+      float ratio, float near, float far )
+{
+   float scale = tanf( angle * 0.5f * VG_PIf / 180.0f ) * near,
+         r = ratio * scale,
+         l = -r,
+         t = scale,
+         b = -t;
+
+   m[0][0] =  2.0f * near / (r - l); 
+   m[0][1] =  0.0f; 
+   m[0][2] =  0.0f; 
+   m[0][3] =  0.0f; 
+   m[1][0] =  0.0f; 
+   m[1][1] =  2.0f * near / (t - b); 
+   m[1][2] =  0.0f; 
+   m[1][3] =  0.0f; 
+   m[2][0] =  (r + l) / (r - l); 
+   m[2][1] =  (t + b) / (t - b); 
+   m[2][2] = -(far + near) / (far - near); 
+   m[2][3] = -1.0f; 
+   m[3][0] =  0.0f; 
+   m[3][1] =  0.0f; 
+   m[3][2] = -2.0f * far * near / (far - near); 
+   m[3][3] =  0.0f;
+} 
+
+static void m4x4_translate( m4x4f m, v3f v )
+{
+   v4_muladds( m[3], m[0], v[0], m[3] );
+   v4_muladds( m[3], m[1], v[1], m[3] );
+   v4_muladds( m[3], m[2], v[2], m[3] );
+}
+
+static inline void m4x4_copy( m4x4f a, m4x4f b )
+{
+       v4_copy( a[0], b[0] );
+       v4_copy( a[1], b[1] );
+       v4_copy( a[2], b[2] );
+       v4_copy( a[3], b[3] );
+}
+
+static inline void m4x4_identity( m4x4f a )
+{
+       m4x4f id = M4X4_IDENTITY;
+       m4x4_copy( id, a );
+}
+
+static inline void m4x4_mul( m4x4f a, m4x4f b, m4x4f d )
+{
+   float a00 = a[0][0], a01 = a[0][1], a02 = a[0][2], a03 = a[0][3],
+         a10 = a[1][0], a11 = a[1][1], a12 = a[1][2], a13 = a[1][3],
+         a20 = a[2][0], a21 = a[2][1], a22 = a[2][2], a23 = a[2][3],
+         a30 = a[3][0], a31 = a[3][1], a32 = a[3][2], a33 = a[3][3],
+
+         b00 = b[0][0], b01 = b[0][1], b02 = b[0][2], b03 = b[0][3],
+         b10 = b[1][0], b11 = b[1][1], b12 = b[1][2], b13 = b[1][3],
+         b20 = b[2][0], b21 = b[2][1], b22 = b[2][2], b23 = b[2][3],
+         b30 = b[3][0], b31 = b[3][1], b32 = b[3][2], b33 = b[3][3];
+
+  d[0][0] = a00*b00 + a10*b01 + a20*b02 + a30*b03;
+  d[0][1] = a01*b00 + a11*b01 + a21*b02 + a31*b03;
+  d[0][2] = a02*b00 + a12*b01 + a22*b02 + a32*b03;
+  d[0][3] = a03*b00 + a13*b01 + a23*b02 + a33*b03;
+  d[1][0] = a00*b10 + a10*b11 + a20*b12 + a30*b13;
+  d[1][1] = a01*b10 + a11*b11 + a21*b12 + a31*b13;
+  d[1][2] = a02*b10 + a12*b11 + a22*b12 + a32*b13;
+  d[1][3] = a03*b10 + a13*b11 + a23*b12 + a33*b13;
+  d[2][0] = a00*b20 + a10*b21 + a20*b22 + a30*b23;
+  d[2][1] = a01*b20 + a11*b21 + a21*b22 + a31*b23;
+  d[2][2] = a02*b20 + a12*b21 + a22*b22 + a32*b23;
+  d[2][3] = a03*b20 + a13*b21 + a23*b22 + a33*b23;
+  d[3][0] = a00*b30 + a10*b31 + a20*b32 + a30*b33;
+  d[3][1] = a01*b30 + a11*b31 + a21*b32 + a31*b33;
+  d[3][2] = a02*b30 + a12*b31 + a22*b32 + a32*b33;
+  d[3][3] = a03*b30 + a13*b31 + a23*b32 + a33*b33;
+}
+
 /*
  * Planes (double precision)
  */