Add camera subsystem

3 files changed, 41 insertions, 2 deletions

diff --git a/src/camera.c b/src/camera.c
new file mode 100644
index 0000000..ffb63cb
--- /dev/null
+++ b/src/camera.c
@@ -0,0 +1,37 @@
+/*
+ * Tuxánci 2 - A first person shooter
+ * Copyright (C) 2007-2011  Tuxánci Development Team
+ * Copyright (C) 2025-2026  Connor Thomson
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "camera.h"
+#include "ta_sdl.h"
+
+ta_camera ta_camera_current;
+
+void ta_camera_init(void) {
+    ta_camera_current = (ta_camera){ 0.0f, 0.0f, 5.0f };
+}
+
+void ta_camera_get_view_matrix(float *matrix) {
+    for (int index = 0; index < 16; index++) {
+        matrix[index] = index % 5 == 0 ? 1.0f : 0.0f;
+    }
+
+    matrix[12] = -ta_camera_current.x;
+    matrix[13] = -ta_camera_current.y;
+    matrix[14] = -ta_camera_current.z;
+}
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index 4cbd53a..7e60569 100644
--- a/src/main.c
+++ b/src/main.c
@@ -35,9 +35,11 @@
 #include "color.h"
 #include "teapot.h"
 #include "mouse.h"
+#include "camera.h"
 
 static void ta_main_init(void) {
     ta_color_init();
+    ta_camera_init();
     ta_window_init();
     ta_exit_key_init();
     ta_sdl_ttf_init();
diff --git a/src/obj_model.c b/src/obj_model.c
index 44cf8aa..ffbfcf3 100644
--- a/src/obj_model.c
+++ b/src/obj_model.c
@@ -20,6 +20,7 @@
 #include <math.h>
 #include <string.h>
 #include "obj_model.h"
+#include "camera.h"
 #include "ta_sdl.h"
 #include "files.h"
 
@@ -156,8 +157,7 @@ void ta_obj_model_render(const ta_obj_model *model, SDL_GPUCommandBuffer *comman
     uniforms.model[14] = model->position[2];
     float aspect = (float)window_width / (float)window_height;
     float focal_length = 1.0f / tanf(22.5f * 0.01745329252f);
-    ta_obj_identity(view);
-    view[14] = -5.0f;
+    ta_camera_get_view_matrix(view);
     projection[0] = focal_length / aspect;
     projection[5] = focal_length;
     projection[10] = -101.0f / 99.0f;