Initial commit

1 files changed, 33 insertions, 0 deletions

diff --git a/09-september/tomcat/renderer/entity.c b/09-september/tomcat/renderer/entity.c
new file mode 100644
index 0000000..d5e7429
--- /dev/null
+++ b/09-september/tomcat/renderer/entity.c
@@ -0,0 +1,33 @@
+#include "renderer.h"
+
+Mat4 Entity_GetModelTransform(Entity* entity)
+{
+    Mat4 temp;
+    Mat4 rotation = mat4_rotate_x(entity->rotX);
+    temp = mat4_rotate_y(entity->rotY);
+    rotation = mat4_mul(&rotation, &temp);
+    temp = mat4_rotate_z(entity->rotZ);
+    rotation = mat4_mul(&rotation, &temp);
+
+    temp = mat4_translate(&entity->position);
+
+    Mat4 modelTransform = mat4_mul(&temp, &rotation);
+    temp = mat4_scale(entity->scale[0], entity->scale[1], entity->scale[2]);
+    modelTransform = mat4_mul(&modelTransform, &temp);
+
+    return modelTransform;
+}
+
+Vec2 Entity_GetTexOffset(Entity *entity)
+{
+    /* Offset inside a texture atlas should default to (0, 0)*/
+    Vec2 tex_offset;
+    Texture *t = entity->texture;
+
+    int column = entity->index % t->number_of_rows;
+    int row = entity->index / t->number_of_rows;
+    tex_offset.x = (float)column / t->number_of_rows;
+    tex_offset.y = (float)row / t->number_of_rows;
+
+    return tex_offset;
+}