Camera class.

06_sdl_application/camera.cpp

@@ -0,0 +1,24 @@
+#include "camera.h"
+
+#include "renderer.h"
+
+void Camera::bind() {
+    Renderer::get_singleton()->set_integer_scaling(integer_scaling);
+
+    Renderer::get_singleton()->set_scale(scale_w, scale_h);
+
+    Renderer::get_singleton()->set_viewport(viewport);
+    Renderer::get_singleton()->set_clip_rect(&clip_rect);
+}
+
+Camera::Camera() {
+    integer_scaling = false;
+
+    scale_w = 1;
+    scale_h = 1;
+
+    viewport = Renderer::get_singleton()->get_viewport();
+    clip_rect = Renderer::get_singleton()->get_viewport();
+}
+Camera::~Camera() {
+}

06_sdl_application/camera.h

@@ -0,0 +1,22 @@
+#ifndef CAMERA_H
+#define CAMERA_H
+
+#include <SDL.h>
+
+#include "rect2.h"
+
+class Camera {
+public:
+    void bind();
+
+    Camera();
+    virtual ~Camera();
+
+    bool integer_scaling;
+    float scale_w;
+    float scale_h;
+    Rect2 viewport;
+    Rect2 clip_rect;
+};
+
+#endif

06_sdl_application/compile.sh

@@ -22,6 +22,7 @@ g++ -Wall -g $(sdl2-config --cflags) -c renderer.cpp -o obj/renderer.o
 g++ -Wall -g $(sdl2-config --cflags) -c image.cpp -o obj/image.o 
 g++ -Wall -g $(sdl2-config --cflags) -c texture.cpp -o obj/texture.o 
 g++ -Wall -g $(sdl2-config --cflags) -c sprite.cpp -o obj/sprite.o 
+g++ -Wall -g $(sdl2-config --cflags) -c camera.cpp -o obj/camera.o 
 
 g++ -Wall -g $(sdl2-config --cflags) -c scene.cpp -o obj/scene.o 
 g++ -Wall -g $(sdl2-config --cflags) -c application.cpp -o obj/application.o 
@@ -29,5 +30,5 @@ g++ -Wall -g $(sdl2-config --cflags) -c main_scene.cpp -o obj/main_scene.o
 
 g++ -Wall -g $(sdl2-config --cflags) -c main.cpp -o obj/main.o
 
-g++ -o bin/program obj/math.o obj/rect2.o obj/color.o obj/string.o obj/renderer.o obj/image.o obj/texture.o obj/sprite.o obj/scene.o obj/application.o obj/main_scene.o   obj/main.o $(sdl2-config --libs) 
+g++ -o bin/program obj/math.o obj/rect2.o obj/color.o obj/string.o obj/renderer.o obj/image.o obj/texture.o obj/sprite.o obj/camera.o  obj/scene.o obj/application.o obj/main_scene.o   obj/main.o $(sdl2-config --libs) 
 

06_sdl_application/main_scene.cpp

@@ -12,6 +12,13 @@ void MainScene::update(float delta) {
 void MainScene::render() {
 	Renderer::get_singleton()->clear();
 
+	_camera->viewport.x -= 1;
+
+	if (_camera->viewport.x >= 300)
+		_camera->viewport.x = 0;
+
+	_camera->bind();
+
 	_sprite->set_x(30);
 	_sprite->set_y(30);
 
@@ -19,6 +26,7 @@ void MainScene::render() {
 }
 
 MainScene::MainScene() {
+	_camera =  new Camera();
 	_image = new Image("ti.bmp");
 	_texture = new Texture(_image);
 	_sprite = new Sprite(_texture);
@@ -31,4 +39,5 @@ MainScene::~MainScene() {
 	delete _sprite;
 	delete _texture;
 	delete _image;
+	delete _camera;
 }

06_sdl_application/main_scene.h

@@ -6,6 +6,7 @@
 #include "image.h"
 #include "texture.h"
 #include "sprite.h"
+#include "camera.h"
 
 class MainScene : public Scene {
 public:
@@ -16,6 +17,7 @@ public:
 	MainScene();
 	~MainScene();
 
+	Camera *_camera;
 	Image *_image;
 	Texture *_texture;
 	Sprite *_sprite;