1 files changed, 47 insertions, 0 deletions
diff --git a/yage/core/camera.cpp b/yage/core/camera.cpp
new file mode 100644
index 00000000..71938cbb
--- /dev/null
+++ b/yage/core/camera.cpp
@@ -0,0 +1,47 @@
+/** ---------------------------------------------------------------------------
+ * @file: camera.cpp
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#include "camera.h"
+#include "glslprogram.h"
+
+#include <glad/glad.h>
+#include <glm/gtc/matrix_transform.hpp>
+
+namespace yage
+{
+
+Camera::Camera(int screen_width, int screen_height)
+    : position_(0.f, 0.f), camera_matrix_(1.f),
+      ortho_matrix_(
+          glm::ortho(0.f, (float)screen_width, 0.f, (float)screen_height))
+{
+}
+
+void Camera::update(GlslProgram &program)
+{
+    if (update_matrix_) {
+        glm::vec3 translate(-position_.x, -position_.y, 0.f);
+        glm::vec3 scale(scale_, scale_, 0.f);
+
+        camera_matrix_ = glm::translate(ortho_matrix_, translate);
+        camera_matrix_ = glm::scale(glm::mat4(1.f), scale) * camera_matrix_;
+
+        update_matrix_ = false;
+    }
+
+    GLint matrix_location = program.getUniformLocation("P");
+    glUniformMatrix4fv(matrix_location, 1, GL_FALSE, &(camera_matrix_[0][0]));
+}
+
+void Camera::move(const glm::vec2 &direction)
+{
+    position_ += direction;
+    update_matrix_ = true;
+}
+
+} // namespace yage