Render fixes + performance boost

src/scene.c

@@ -1,5 +1,6 @@
 #include "renderer.h"
 #include "scene.h"
+#include <SDL2/SDL_blendmode.h>
 #include <SDL2/SDL_error.h>
 #include <SDL2/SDL_image.h>
 #include <SDL2/SDL_render.h>
@@ -7,6 +8,8 @@
 #include <stdio.h>
 #include <string.h>
 
+const RenderObject_t EMPTY_RENDER_OBJECT = { 0, 0, 0, 0, NULL, "Undefined" };
+
 static int compartSort(const SceneObject_t * a, const SceneObject_t * b) {
 	return a->renderObj.z - b->renderObj.z;
 }
@@ -15,6 +18,7 @@ void scene_render(const Scene_t * scene) {
 	MonitorSize_t monitorSize = renderer_getMonitorSize();
 
 	for(int i = 0; i < scene->objectCount; i++) {
+		printf("Rendering %d, %s\n", scene->objects[i].id, scene->objects[i].renderObj.name);
 		const SceneObject_t * object = &scene->objects[i];
 		float x = (object->x - scene->x) / CAMERA_WIDTH;
 		float y = (object->y - scene->y) / CAMERA_HEIGHT;
@@ -49,6 +53,8 @@ RenderId_t scene_addRenderObject(Scene_t * scene, RenderObject_t object, int x,
 	scene->objectCount++;
 	RenderId_t itemId = scene->lastId++;
 
+	printf("adding item: %s: %d\n", object.name, itemId);
+
 	if(scene->objectCount * sizeof(SceneObject_t) > scene->objectArraySize) {
 		scene->objectArraySize = scene->objectCount * sizeof(SceneObject_t);
 		scene->objects = realloc(scene->objects, scene->objectArraySize);
@@ -73,7 +79,7 @@ RenderId_t scene_addRenderObject(Scene_t * scene, RenderObject_t object, int x,
 	return itemId;
 }
 
-void scene_removeRenderObject(Scene_t * scene, RenderId_t id) {
+static int indexof(Scene_t * scene, RenderId_t id) {
 	bool found = false;
 	int index = 0;
 	for(int i = 0; i < scene->objectCount; i++) {
@@ -85,8 +91,30 @@ void scene_removeRenderObject(Scene_t * scene, RenderId_t id) {
 	}
 	if(!found){
 		printf("object %d not found\n", id);
-		return;
+		return -1;
 	}
+
+	return index;
+}
+
+void scene_moveRenderObject(Scene_t * scene, RenderId_t id, float x, float y) {
+	int index = indexof(scene, id);
+	if(index < 0)
+		return;
+
+	SceneObject_t * object = &scene->objects[index];
+	object->x = x;
+	object->y = y;
+}
+
+void scene_removeRenderObject(Scene_t * scene, RenderId_t id) {
+	int index = indexof(scene, id);
+	if(index < 0)
+		return;
+
+	printf("removing item: %s: %d\n", scene->objects[index].renderObj.name, id);
+
+
 	scene->objectCount--;
 
 	for(int i = index; i < scene->objectCount; i++) {