Shadow mapping

texture.hh

@@ -22,6 +22,88 @@ static unsigned ilog2(unsigned in)
   return ret;
 }
 
+class Framebuffer {
+public:
+  Framebuffer() {
+    glGenFramebuffers(1, &_fbID);
+  }
+
+  ~Framebuffer() {
+    glDeleteFramebuffers(1, &_fbID);
+  }
+
+  void bind() const {
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, _fbID);
+  }
+
+  GLuint getID() const {
+    return _fbID;
+  }
+
+  void attachTexture(GLenum textarget, GLuint texID) {
+    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
+			   textarget, texID, 0);
+  }
+  
+private:
+  GLuint _fbID;
+};
+
+class TextureCubeMap {
+public:
+  TextureCubeMap(unsigned size) {
+    glGenTextures(1, &_texID);
+    glBindTexture(GL_TEXTURE_CUBE_MAP, _texID);
+    
+    if(SDL_GL_ExtensionSupported("GL_ARB_texture_storage"))
+      glTexStorage2D(GL_TEXTURE_CUBE_MAP, 1, GL_DEPTH_COMPONENT24,
+		     size, size);
+    else {
+      std::printf("Warning: extension GL_ARB_texture_storage not supported!\n");
+      for (unsigned i = 0;i < 6;++i) {
+	GLenum const face[6] = {GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
+				GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
+				GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z};
+	glTexImage2D(face[i], 0, static_cast<GLint>(GL_DEPTH_COMPONENT16), size, size, 0,
+		     GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT, NULL);
+      }
+    }
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAX_LEVEL, 0);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, static_cast<GLint>(GL_LINEAR));
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, static_cast<GLint>(GL_LINEAR));
+  }
+
+  ~TextureCubeMap() {
+    glDeleteTextures(1, &_texID);
+  }
+
+  TextureCubeMap(TextureCubeMap const& copy) = delete;
+  TextureCubeMap& operator=(TextureCubeMap const& copy) = delete;
+
+  TextureCubeMap(TextureCubeMap && move) : _texID(move._texID) {
+    move._texID = 0;
+  }
+
+  TextureCubeMap& operator=(TextureCubeMap && move) {
+    glDeleteTextures(1, &_texID);
+    _texID = move._texID;
+    move._texID = 0;
+
+    return *this;
+  }
+  
+  void bind() const {
+    glBindTexture(GL_TEXTURE_CUBE_MAP, _texID);
+  }
+
+  GLuint getID() const {
+    return _texID;
+  }
+  
+private:
+  GLuint _texID;
+};
+
 class Texture2D {
 public:
   Texture2D(unsigned width, unsigned height) {