add 4d rotation ops and view matrix calculation

1 files changed, 88 insertions, 0 deletions

diff --git a/src/4dvecops/rotations4d.cpp b/src/4dvecops/rotations4d.cpp
new file mode 100644
index 0000000..62746eb
--- /dev/null
+++ b/src/4dvecops/rotations4d.cpp
@@ -0,0 +1,88 @@
+#include "raytracer/raytracer.h"
+
+glm::mat4 getRotationMatrix4XY(
+        float angleRadians) {
+    glm::mat4 result;
+    result[0][0] = cos(angleRadians);
+    result[0][1] = -sin(angleRadians);
+    result[1][0] = sin(angleRadians);
+    result[1][1] = cos(angleRadians);
+    result[2][2] = 1;
+    result[3][3] = 1;
+    return result;
+}
+
+glm::mat4 getRotationMatrix4YZ(
+        float angleRadians) {
+    glm::mat4 result;
+    result[1][1] = cos(angleRadians);
+    result[1][2] = -sin(angleRadians);
+    result[2][1] = sin(angleRadians);
+    result[2][2] = cos(angleRadians);
+    result[0][0] = 1;
+    result[3][3] = 1;
+    return result;
+}
+
+glm::mat4 getRotationMatrix4ZX(
+        float angleRadians) {
+    glm::mat4 result;
+    result[2][2] = cos(angleRadians);
+    result[2][0] = -sin(angleRadians);
+    result[0][2] = sin(angleRadians);
+    result[0][0] = cos(angleRadians);
+    result[1][1] = 1;
+    result[3][3] = 1;
+    return result;
+}
+
+glm::mat4 getRotationMatrix4XW(
+        float angleRadians) {
+    glm::mat4 result;
+    result[0][0] = cos(angleRadians);
+    result[0][3] = -sin(angleRadians);
+    result[3][0] = sin(angleRadians);
+    result[3][3] = cos(angleRadians);
+    result[1][1] = 1;
+    result[2][2] = 1;
+    return result;
+}
+
+glm::mat4 getRotationMatrix4YW(
+        float angleRadians) {
+    glm::mat4 result;
+    result[1][1] = cos(angleRadians);
+    result[1][3] = -sin(angleRadians);
+    result[3][1] = sin(angleRadians);
+    result[3][3] = cos(angleRadians);
+    result[0][0] = 1;
+    result[2][2] = 1;
+    return result;
+}
+
+glm::mat4 getRotationMatrix4ZW(
+        float angleRadians) {
+    glm::mat4 result;
+    result[2][2] = cos(angleRadians);
+    result[2][3] = -sin(angleRadians);
+    result[3][2] = sin(angleRadians);
+    result[3][3] = cos(angleRadians);
+    result[0][0] = 1;
+    result[1][1] = 1;
+    return result;
+}
+
+glm::mat4 RayTracer::getRotationMatrix4(
+        float angleRadiansXY,
+        float angleRadiansYZ,
+        float angleRadiansZX,
+        float angleRadiansXW,
+        float angleRadiansYW,
+        float angleRadiansZW) {
+    return getRotationMatrix4XY(angleRadiansXY) *
+           getRotationMatrix4YZ(angleRadiansYZ) *
+           getRotationMatrix4ZX(angleRadiansZX) *
+           getRotationMatrix4XW(angleRadiansXW) *
+           getRotationMatrix4YW(angleRadiansYW) *
+           getRotationMatrix4ZW(angleRadiansZW);
+}
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