Added camera, use MVP.

camera.odin

@@ -0,0 +1,62 @@
+package renderer
+
+import "core:math/linalg"
+
+Camera :: struct {
+    position: [3]f32,
+    forward, up: [3]f32,
+
+    fov: f32,
+    near, far: f32,
+
+    yaw, pitch: f32,
+}
+
+create_camera :: proc(renderer: ^Renderer, position: [3]f32, forward, up: [3]f32, fov, near, far: f32) -> Camera {
+    c: Camera
+    c.position = position
+    c.forward = forward
+    c.up = up
+    c.fov = fov
+    c.near = near
+    c.far = far
+
+    assert(c.forward != {})
+    assert(c.up != {})
+    assert(fov > 0)
+    assert(near > 0)
+    assert(far > 0)
+
+    return c
+}
+
+get_camera_view_matrix :: proc(camera: ^Camera) -> (linalg.Matrix4f32, bool) {
+    if camera == nil {
+        return {}, false
+    }
+    
+    center := camera.position + camera.forward
+    view_matrix := linalg.identity(linalg.Matrix4x4f32)
+	view_matrix *= linalg.matrix4_look_at_f32(camera.position, center, camera.up)
+
+    return view_matrix, true
+}
+
+get_camera_projection_matrix :: proc(renderer: ^Renderer, camera: ^Camera) -> (linalg.Matrix4f32, bool) {
+    if camera == nil {
+        return {}, false
+    }
+
+    projection_matrix := linalg.identity(linalg.Matrix4x4f32)
+    projection_matrix *= linalg.matrix4_perspective(camera.fov, get_aspect_ratio(renderer), camera.near, camera.far)
+
+    return projection_matrix, true
+}
+
+set_active_camera :: proc(renderer: ^Renderer, camera: ^Camera) {
+    renderer.active_camera = camera
+}
+
+get_active_camera :: proc(renderer: ^Renderer) -> ^Camera {
+    return renderer.active_camera
+}