Added missing files

src/frontend/BlocksPreview.cpp

@@ -0,0 +1,71 @@
+#include "BlocksPreview.h"
+
+#include <glm/ext.hpp>
+
+#include "../graphics/Shader.h"
+#include "../graphics/Texture.h"
+#include "../graphics/Atlas.h"
+#include "../graphics/Batch3D.h"
+#include "../window/Camera.h"
+#include "../voxels/Block.h"
+#include "../window/Window.h"
+#include "ContentGfxCache.h"
+
+using glm::vec4;
+using glm::vec3;
+
+BlocksPreview::BlocksPreview(Shader* shader, 
+                             Atlas* atlas, 
+                             const ContentGfxCache* cache)
+    : shader(shader), atlas(atlas), cache(cache) {
+    batch = new Batch3D(1024);
+    camera = new Camera(vec3(0.0f), 1.0f);
+}
+
+BlocksPreview::~BlocksPreview() {
+    delete camera;
+    delete batch;
+}
+
+void BlocksPreview::begin() {
+    shader->use();
+    shader->uniformMatrix("u_projview", 
+        glm::ortho(0.0f, 
+                    float(Window::width), 
+                   0.0f, 
+                    float(Window::height), -1000.0f, 1000.0f) * 
+        glm::lookAt(vec3(2, 2, 2), vec3(0.0f), vec3(0, 1, 0)));
+    atlas->getTexture()->bind();
+}
+
+/* Draw one block preview at given screen position */
+void BlocksPreview::draw(const Block* def, int x, int y, int size, vec4 tint) {
+    y = Window::height - y - 1;
+    x += 2;
+    y -= 35;
+    shader->uniformMatrix("u_apply", glm::translate(glm::mat4(1.0f), vec3(x/float(Window::width) * 2, y/float(Window::height) * 2, 0.0f)));
+    blockid_t id = def->rt.id;
+    const UVRegion texfaces[6]{ cache->getRegion(id, 0), cache->getRegion(id, 1),
+                                cache->getRegion(id, 2), cache->getRegion(id, 3),
+                                cache->getRegion(id, 4), cache->getRegion(id, 5)};
+
+    switch (def->model) {
+        case BlockModel::none:
+            // something went wrong...
+            break;
+        case BlockModel::block:
+            batch->blockCube(vec3(size * 0.63f), texfaces, tint, !def->rt.emissive);
+            break;
+        case BlockModel::aabb:
+            batch->blockCube(def->hitbox.size() * vec3(size * 0.63f), texfaces, tint, !def->rt.emissive);
+            break;
+        case BlockModel::xsprite: {
+            //batch->xSprite(size, size, texfaces[0], tint, !def->rt.emissive);
+            vec3 right = glm::normalize(vec3(1.f, 0.f, -1.f));
+            batch->sprite(right*float(size)*0.43f+vec3(0, size*0.4f, 0), vec3(0.f, 1.f, 0.f), right, size*0.5f, size*0.6f, texfaces[0], tint);
+            break;
+        }
+    }
+    
+    batch->flush();
+}

src/frontend/BlocksPreview.h

@@ -0,0 +1,28 @@
+#ifndef FRONTEND_BLOCKS_PREVIEW_H_
+#define FRONTEND_BLOCKS_PREVIEW_H_
+
+#include "../typedefs.h"
+#include <glm/glm.hpp>
+
+class Shader;
+class Atlas;
+class Batch3D;
+class Camera;
+class Block;
+class ContentGfxCache;
+
+class BlocksPreview {
+    Shader* shader;
+    Atlas* atlas;
+    Batch3D* batch;
+    Camera* camera;
+    const ContentGfxCache* const cache;
+public:
+    BlocksPreview(Shader* shader, Atlas* atlas, const ContentGfxCache* cache);
+    ~BlocksPreview();
+
+    void begin();
+    void draw(const Block* block, int x, int y, int size, glm::vec4 tint);
+};
+
+#endif // FRONTEND_BLOCKS_PREVIEW_H_