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math.h

@@ -1,6 +1,35 @@
+FUNCTION
+Mat4 mat4_identity() {
+  return {
+    1,0,0,0,
+      0,1,0,0,
+      0,0,1,0,
+      0,0,0,1,
+  };
+}
 
 FUNCTION
-Mat4 make_matrix_rotation_x(float rotation) {
+Mat4 mat4_scale(Vec3 a) {
+  return {
+    a.x, 0, 0, 0,
+      0, a.y, 0, 0,
+      0, 0, a.z, 0,
+      0, 0, 0, 1
+  };
+}
+
+FUNCTION
+Mat4 mat4_translation(Vec3 a) {
+  return {
+    1, 0, 0, a.x,
+    0, 1, 0, a.y,
+    0, 0, 1, a.z,
+    0, 0, 0, 1
+  };
+}
+
+FUNCTION
+Mat4 mat4_rotation_z(float rotation) {
   float s = sinf(rotation);
   float c = cosf(rotation);
   Mat4 result = {
@@ -13,7 +42,7 @@ Mat4 make_matrix_rotation_x(float rotation) {
 }
 
 FUNCTION
-Mat4 make_matrix_rotation_y(float rotation) {
+Mat4 mat4_rotation_y(float rotation) {
   float s = sinf(rotation);
   float c = cosf(rotation);
   Mat4 result = {
@@ -26,7 +55,7 @@ Mat4 make_matrix_rotation_y(float rotation) {
 }
 
 FUNCTION
-Mat4 make_matrix_rotation_z(float rotation) {
+Mat4 mat4_rotation_x(float rotation) {
   float s = sinf(rotation);
   float c = cosf(rotation);
   Mat4 result = {
@@ -39,9 +68,9 @@ Mat4 make_matrix_rotation_z(float rotation) {
 }
 
 FUNCTION
-Mat4 make_matrix_perspective(float fov, float window_x, float window_y, float znear, float zfar) {
+Mat4 mat4_perspective(float fov, float window_x, float window_y, float znear, float zfar) {
   float aspect_ratio = window_y / window_x;
-  float f = (1.f / tanf((fov/2.f)*(180.f/PI32)));
+  float f = (1.f / tanf((fov/2.f)*deg2rad));
   Mat4 result = {
     aspect_ratio*f, 0, 0, 0,
     0, f, 0, 0,
@@ -51,8 +80,21 @@ Mat4 make_matrix_perspective(float fov, float window_x, float window_y, float zn
   return result;
 }
 
+FN Mat4 mat4_look_at(Vec3 pos, Vec3 target, Vec3 up) {
+  Vec3 z = normalize(target - pos);
+  Vec3 x = normalize(cross(up, z));
+  Vec3 y = cross(z, x);
+  Mat4 result = {
+    x.x,x.y,x.z,-dot(x,pos),
+    y.x,y.y,y.z,-dot(y,pos),
+    z.x,z.y,z.z,-dot(z,pos),
+    0,0,0,       1,
+  };
+  return result;
+}
+
 FUNCTION
-Mat4 transpose(Mat4 a) {
+Mat4 mat4_transpose(Mat4 a) {
   Mat4 result = a;
   result.p[0][1] = result.p[1][0];
   result.p[0][2] = result.p[2][0];
@@ -64,7 +106,7 @@ Mat4 transpose(Mat4 a) {
 }
 
 FUNCTION
-Mat4 translate(Mat4 a, Vec3 translation) {
+Mat4 mat4_translate(Mat4 a, Vec3 translation) {
   a.p[0][0] += translation.x;
   a.p[0][1] += translation.y;
   a.p[0][2] += translation.z;